Record 1 of 155 DEPIERRE A; CHASTANG C; QUOIX E; LEBEAU B; BLANCHON F; PAILLOT N; LEMARIE E; MILLERON B; MORO D; CLAVIER J; HERMAN D; TUCHAIS E; JACOULET P; BRECHOT JM; CORDIER JF; SOLALCELIGNY P; BADRI N; BESENVAL M VINORELBINE VERSUS VINORELBINE PLUS CISPLATIN IN ADVANCED NONSMALL CELL LUNG-CANCER - A RANDOMIZED TRIAL ANNALS OF ONCOLOGY 1994, Vol 5, Iss 1, pp 37-42 DEPT RESP DIS,BESANCON,FRANCE ST LOUIS HOSP,DEPT BIOSTAT & MED INFORMAT,PARIS,FRANCE DEPT RESP DIS,STRASBOURG,FRANCE ST ANTOINE HOSP,DEPT RESP DIS,PARIS,FRANCE DEPT RESP DIS,MEAUX,FRANCE DEPT RESP DIS,METZ,FRANCE TENON HOSP,DEPT RESP DIS,PARIS,FRANCE DEPT RESP DIS,GRENOBLE,FRANCE DEPT RESP DIS,BREST,FRANCE DEPT RESP DIS,NEVERS,FRANCE DEPT RESP DIS,ANGERS,FRANCE HOP HOTEL DIEU,DEPT RESP DIS,PARIS,FRANCE DEPT RESP DIS,LYON,FRANCE DEPT RESP DIS,LE MANS,FRANCE PIERRE FABRE ONCOL,DEPT RESP DIS,BOULOGNE,FRANCE DEPT RESP DIS,TOURS,FRANCE NONSMALL CELL LUNG CANCER; RANDOMIZED PHASE III; CHEMOTHERAPY; VINORELBINE; CISPLATIN HIGH-DOSE CISPLATIN; COMBINATION CHEMOTHERAPY; CLINICAL-TRIALS; ONCOLOGY-GROUP; VINDESINE; CARCINOMA; ETOPOSIDE; MANAGEMENT; SURVIVAL; DESIGN Purpose: The purpose of the study was to assess the possible benefit of the combination vinorelbine (NVB)-cisplatin (DDP) in comparison with NVB alone in advanced nonsmall cell lung cancer (NSCLC), not treated previously. It also involved confirmation of the efficacy of vinorelbine as monotherapy. Patients and methods: In this phase III trial, 231 eligible patients were stratified by centre and randomized to receive either NVB alone, 30 mg/m(2)/week or the combination of NVB 30 mg/m(2)/week and DDP 80 mg/m(2)/3 weeks. Patients were to be treated for a minimum of 6 weeks, with the first response assessment performed 9 weeks after the beginning of treatment. Results: The two groups differed in terms of objective response rates (16% and 43%, respectively, p = 0.0001) and median time to progression (10 weeks and 20 weeks, p = 0.0001). However, the difference was not significant for median survival time (32 weeks, 33 weeks, p = 0.48). The addition of DDP resulted in an increase in toxicity, in particular renal, hematologic, neurologic and emetic. This toxicity led to treatment discontinuation in 8% and 21% of patients, respectively. Respectively 3% and 13% of patients stopped treatment early during objective response (toxicity or refusal). Conclusions: The NVB-DDP combination increased objective response rates and time to progression in comparison with NVB alone, but did not influence the survival of patients. The activity of NVB in the treatment of advanced NSCLC was confirmed. 87 6 JAN MW507 ANN ONCOL

Record 2 of 155 LOISEAU T; FEREY G OXYFLUORINATED MICROPOROUS COMPOUNDS .7. SYNTHESIS AND CRYSTAL-STRUCTURE AND ULM-5, A NEW FLUORINATED GALLOPHOSPHATE GA16(PO4)14(HPO4)2(OH)2F7, [H3N(CH2)6NH3]4,6-H2O WITH 16-MEMBERED RINGS AND BOTH BONDING AND ENCAPSULATED F- JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 111, Iss 2, pp 403-415 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE MOLECULAR-SIEVES; TEMPLATE; SOLIDS Hitherto unknown Ga16(PO4)14(HPO4)2(OH)2F7, [H3N(CH2)6 NH3]4, 6 H2O was obtained by hydrothermal synthesis (453 K, 24 hr, autogeneous pressure) from a mixture of Ga2O3, P2O5, HF, 1,6-diaminohexane, and H2O in the ratio 1: 1: 2: 1: 80. It is orthorhombic (space group P22(1)2(1) (No. 18)) with a = 10.252(2) angstrom, b = 18.409(4) angstrom, c = 24.639(7) angstrom, V = 4649.8(9) angstrom3, Z = 4. The three-dimensional network is built up from three types of basic building units; the first, close to that already encountered for ULM-3 and -4, consists of corner-linked [Ga3(PO4)2(HPO4)F2] hexameric units composed of two PO4 tetrahdra, one HPO4 tetrahedron, two GaO4F trigonal bipyramids, and one GaO4F2 octahedron, with fluorine atoms shared between the gallium polyhedra; the second is very similar to the first except that one of the trigonal bipyramids is replaced by a tetrahedron GaO3(OH); the third is octameric Ga4(PO4)4 and can be considered in a first approximation as formed by a cube of corner-linked GaO4 and PO4 tetrahedra, which encapsulate a fluorine atom. It is shown that this fluorine is bonded in fact to two of the four gallium of this cube. For the first time, both bonding and encapsulated F- are present in the same structure. The framework delimits 16- and 6-membered ring channels along [100] and 8-membered ones along [010]. The diprotonated amines are inserted in the 16-membered ovoid channels, whose free aperture is 12.20 x 8.34 angstrom. The water molecules are in the 6-membered tunnels. (C) 1994 Academic Press, Inc. 56 13 AUG PC615 J SOLID STATE CHEM

Record 3 of 155 GIMEL JC; DURAND D; NICOLAI T STRUCTURE AND DISTRIBUTION OF AGGREGATES FORMED AFTER HEAT-INDUCED DENATURATION OF GLOBULAR-PROTEINS MACROMOLECULES 1994, Vol 27, Iss 2, pp 583-589 UNIV MAINE,PHYSICOCHIM MACROMOLEC LAB,CNRS,URA,F-72017 LE MANS,FRANCE The structure of aggregates formed upon heat-induced denaturation of beta-lactoglobulin at pH 7.0 and 0.1 RI ammonium acetate is studied by dynamic and static light scattering and small-angle neutron scattering. The internal structure and size distribution of the aggregates is found to be independent of the heating conditions (70 and 76 degrees C) and concentration (0.4, 2.0, 10, 30 g/L). The aggregates are self-similar down to a length scale of about 5 nm with a fractal dimension d(f) = 2.02 +/- 0.02. The experimental results are compatible with a power law aggregation number distribution with an exponential cutoff at a characteristic aggregation number s(*): n(s) proportional to s(-tau) exp(-s/s(*)). From explicit analysis of dynamic light-scattering results the polydispersity coefficient tau is found to be close to unity. The internal dynamics are intermediate between those of fully flexible polymers and rigid aggregates. 46 7 JAN 17 MT924 MACROMOLECULES

Record 4 of 155 SINHA SK; SANYAL MK; SATIJA SK; MAJKRZAK CF; NEUMANN DA; HOMMA H; SZPALA S; GIBAUD A; MORKOC H X-RAY-SCATTERING STUDIES OF SURFACE-ROUGHNESS OF GAAS/ALAS MULTILAYERS PHYSICA B 1994, Vol 198, Iss 1-3, pp 72-77 SINHA SK, EXXON RES & ENGN CO,ANNANDALE,NJ 08801 BHABHA ATOM RES CTR,BOMBAY 40000885,INDIA NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899 UNIV ILLINOIS,URBANA,IL 61801 CUNY BROOKLYN COLL,BROOKLYN,NY 11210 UNIV MAINE,F-72017 LE MANS,FRANCE NEUTRON-SCATTERING We discuss the theory of X-ray scattering from multilayers with conformal roughness of the interfaces, and illustrate with an analysis of specular, diffuse and wide-angle scattering from a GaAs/AlAs multilayer. This is a highly coherent multilayer structure deposited on a stepped, but otherwise smooth surface. The roughness due to the steps propagates through the layers and a distinct anisotropy is observed in the diffuse scattering. We discuss a method to treat diffuse scattering from such surfaces with slightly irregular steps. 44 6 APR NR013 PHYSICA B

Record 5 of 155 CAVELLEC M; RIOU D; FEREY G OXYFLUORINATED MICROPOROUS COMPOUNDS .11. SYNTHESIS AND CRYSTAL-STRUCTURE OF ULM-10 - THE 1ST BIDIMENSIONAL MIXED-VALENCE IRON FLUOROPHOSPHATE WITH INTERCALATED ETHYLENEDIAMINE JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 112, Iss 2, pp 441-442 UNIV MAINE,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSAIEN,F-72017 LE MANS,FRANCE SOLIDS The first oxyfluorinated iron(II, III) phosphate (Fe3+Fe2+F2 (HPO4)2(H2O)2, ethylenediamine] with an open structure has been synthesized. It is triclinic (P-1 (No. 2), a = 5.174(2) angstrom, b = 7.518(2) angstrom, c = 8.773(3) angstrom, alpha = 108.37(1)-degrees, beta = 97.33(2)-degrees, gamma = 109.86(2)-degrees, Z = 1). Its bidimensional structure contains chains of Fe(II) and Fe(III) octahedra, arranged in an ordered way and linked to each other by phosphate groUpS. (C) 1994 Academic Press, Inc. 35 2 OCT PK737 J SOLID STATE CHEM

Record 6 of 155 RIOU D; FEREY G OXYFLUORINATED MICROPOROUS COMPOUNDS .8. SYNTHESIS AND STRUCTURE DETERMINATION OF V2PO8F,EN (ULM-7V) - THE 1ST OXYFLUOROVANADO(V) PHOSPHATE TEMPLATED BY ETHYLENEDIAMINE JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 111, Iss 2, pp 422-426 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE HYDROTHERMAL SYNTHESIS This paper describes the synthesis and the structure determination of [V2PO8F]2-, [C2N2H10]2+(en), the first oxyfluorinated vanadophosphate with an open framework structure. V2PO8F, en crystallizes in the acentric P2(1)2(1)2(1) (No. 19) space group with cell parameters a = 8.2939(6) angstrom, b = 9.2260(8) angstrom, c = 12.5021(8) angstrom V = 956.7(2) angstrom3, Z = 4. The structure consists of chains of alternating VO6 octahedra and PO4 tetrahedra in the [001] direction. These chains, located at y almost-equal-to 0 and 1/2, are linked by VO5 square pyramids at y almost-equal-to +/-1/4 levels in such a way that the two types of corner-sharing vanadium polyhedra form zigzag chains along the [100] direction. This framework defines 10-membered windows in the (110) and (1 - 10) planes and 10-membered zigzag tunnels along [001] inside which the diprotonated ethylenediamine is located. (C) 1994 Academic Press, Inc. 34 5 AUG PC615 J SOLID STATE CHEM

Record 7 of 155 LOISEAU T; RETOUX R; LACORRE P; FEREY G OXYFLUORINATED MICROPOROUS COMPOUNDS .5. SYNTHESIS AND X-RAY STRUCTURAL DETERMINATION OF ULM-3, A NEW FLUORINATED GALLOPHOSPHATE GA3P3O12F2, H3N(CH2)3NH3, H2O JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 111, Iss 2, pp 427-436 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE CRYSTAL-STRUCTURE; MOLECULAR-SIEVES; TEMPLATE; SOLIDS Ga3P3O12F2, H3N(CH2)3NH3, H2O was obtained by hydrothermal synthesis (453 K, 24 hr, autogeneous pressure) from a mixture of Ga2O3, P2O5, HF, 1,3-diaminopropane, and H2O in the ratio 1:1:2:1.3:80. It is orthorhombic (space group Pbca (No. 61) with a = 10.154(1) angstrom, b = 18.393(2) angstrom, c = 15.773(2) angstrom, V = 2945.8(9) angstrom3, Z = 8. The three-dimensional network is built up from corner-linked [Ga3(PO4)3F2] units composed of three PO4 tetrahedra, two GaO4F trigonal bipyramids, and one GaO4F2 octahedron. Fluorine atoms are shared between the octahedron and the bipyramid. The framework delimits 10-membered ring channels along [100] and 8-membered ones along [101] and [10-1]. The amine and the water molecule are inserted in the 10-membered ring channels. The hydrogen bonding scheme is discussed and shows that the water is principally linked to the amine within the tunnel and that the template might be the amine monohydrate. The thermal behavior of the title compound is studied by TGA and X-ray thermodiffractometry. (C) 1994 Academic Press, Inc. 29 10 AUG PC615 J SOLID STATE CHEM

Record 8 of 155 GOSSELIN P; BONFAND E; HAYES P; RETOUX R; MAIGNAN C ASYMMETRIC INTERMOLECULAR DIELS-ALDER REACTIONS OF ENANTIOPURE SULFINYL-HOMODIENES AND SULFINYL-HETERODIENES - PRELIMINARY-RESULTS TETRAHEDRON-ASYMMETRY 1994, Vol 5, Iss 5, pp 781-784 FAC SCI LE MANS,SYNTH ORGAN LAB,CNRS,URA 482,F-72017 LE MANS,FRANCE FAC SCI LE MANS,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE CATALYZED COUPLING REACTIONS; VINYL SULFOXIDES; STEREOCHEMISTRY Reaction of (E)-(+)-(R)-2-p-tolylsulfinyl-1,3-pentadiene 1 with maleimide afforded 3 as a single, enantiomerically pure adduct under very mild conditions. 3 resulted from exclusive endo approach by a completely diastereofacialselective route. On the other hand, heterodiene (+)-(S)-3-p-tolylsulfinyl-3-buten-2-one 2 smoothly reacted with sensitive 2-methylenetetrahydrofuran yielding 1:1 diastereomeric dioxaspirodducts 4a and 4b, readily separated by liquid chromatography. 29 4 MAY NP503 TETRAHEDRON-ASYMMETRY

Record 9 of 155 LOISEAU T; FEREY G SYNTHESIS AND CRYSTAL-STRUCTURE OF A NEW VIV/VV MIXED-VALENCE MICROPOROUS COMPOUND V3P2O13(H2O)2, H3N(CH2)3NH3 JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 111, Iss 2, pp 416-421 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE MOLECULAR-SIEVES; SOLIDS Hitherto unknown vanado(IV, V)phosphate, ideally V(IV)V2(V)P2O13 (H2O)2, H3N(CH2)3NH3 was obtained by hydrothermal synthesis (453 K, 24 hr, autogeneous pressure) from a mixture of V2O5, P2O5, 1,3-diaminopropane, and H2O in the ratio 1:1:1.3:1:80. It is orthorhombic (space group Pnma (No. 62)) with a = 10. 567(1) angstrom, b = 16.970(2) angstrom, c = 8.413(1) angstrom, V = 1508.1(7) angstrom3, Z = 4. The three-dimensional network is built up from the corner linkage of pentameric secondary building units based on two PO4 tetrahedra, one VO5 square pyramid, and two VO5(H2O) octahedra sharing vertices. The framework delimits large 10-membered ovoid zigzag tunnels along [100] and smaller eight-membered ones along [010]. The true composition of the solid is discussed. The diprotonated amines are inserted in the 10-membered ovoid channels, whose free aperture is 7.30 x 4.00 angstrom. (C) 1994 Academic Press, Inc. 22 6 AUG PC615 J SOLID STATE CHEM

Record 10 of 155 ALLARD JF; CASTAGNEDE B; HENRY M; LAURIKS W EVALUATION OF TORTUOSITY IN ACOUSTIC POROUS MATERIALS SATURATED BY AIR REVIEW OF SCIENTIFIC INSTRUMENTS 1994, Vol 65, Iss 3, pp 754-755 ALLARD JF, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,F-72017 LE MANS,FRANCE KATHOLIEKE UNIV LEUVEN,DEPT NATUURKUNDE,AKOESTIEK WARMTEGELEIDING LAB,B-3001 LOUVAIN,BELGIUM MEDIA; WAVES Tortuosity is an important parameter for the prediction of the acoustical properties of porous sound absorbing materials. The evaluation of tortuosity by resistivity measurements is now used in several laboratories, although this method presents several drawbacks. In particular, the complete saturation by a conducting fluid of a porous foam having a high flow resistivity is difficult to obtain without partially damaging the structure of the cells. A simple technique based on ultrasonic wavespeed measurements in a material saturated by air is described. This method has been used previously only for water or superfluid helium saturated materials. 22 2 MAR NA930 REV SCI INSTR

Record 12 of 155 GOLDSTEIN FW; GESLIN P; ACAR JE; AKLI J; ALLOUCH P; BEBEAR C; BLONDEL P; BOISIVON A; BURDIN JC; CHARDON H; COUPRY A; CROIX JC; DORCHE G; FIEVET P; GEFFROY F; GRILLOT ML; HAUTEFORT B; LARROUY M; LEFRAND H; LEMELAND JF; LIBERT JM; MARMONIER A; MELON M; NICOLAS MH; REVEIL JC; RIO Y; SANCHEZ R; SEDAILLAN A COMPARATIVE ACTIVITY OF TEICOPLANIN AND VANCOMYCIN AGAINST 400 PENICILLIN-SUSCEPTIBLE AND RESISTANT STREPTOCOCCUS-PNEUMONIAE EUROPEAN JOURNAL OF CLINICAL MICROBIOLOGY & INFECTIOUS DISEASES 1994, Vol 13, Iss 1, pp 33-34 GOLDSTEIN FW, HOP ST JOSEPH,MICROBIOL MED LAB,7 RUE PIERRE LAROUSSE,F-75674 PARIS 14,FRANCE CTR HOSP INTERCOMMUNAL,SERV MICROBIOL,F-94010 CRETEIL,FRANCE CTR HOSP GEN,F-40106 BLOIS,FRANCE HOP ANDRE MIGNOT,F-78157 LE CHESNAY,FRANCE CTR HOSP PELLEGRIN TRIPODE,F-33076 BORDEAUX,FRANCE CTR HOSP GEN,F-93205 ST DENIS,FRANCE HOP CENT,F-54035 NANCY,FRANCE CTR HOSP GEN,F-13616 AIX EN PROVENCE,FRANCE NOUVEL HOP FLEYRAT,F-01012 BOURG EN BRESSE,FRANCE CTR GEN HOSP,F-10003 TROYES,FRANCE HOP BELLEVUE,F-42043 ST ETIENNE,FRANCE CTR HOSP,F-59507 DOUAI,FRANCE CTR HOSP RENE LAENNEC,F-29107 QUIMPER,FRANCE CTR HOSP INTERCOMMUNAL,CRETEIL,FRANCE HOP GEN,F-76083 LE HAVRE,FRANCE CTR GEN HOSP,F-13697 ARLES,FRANCE CTR HOSP INTERCOMMUNAL COTE BASQUE,F-64109 BAYONNE,FRANCE HOP HENRI DUFFAUT,F-84902 AVIGNON 09,FRANCE HOP HOTEL DIEU,F-76000 ROUEN,FRANCE CTR HOSP,F-72037 LE MANS,FRANCE CTR HOSP GEN,F-64011 PAU,FRANCE HOP AMBROISE PARE,F-92104 BOULOGNE,FRANCE HOP MANCHESTER,CHARLEVILLE MEZIE,FRANCE HOP NOTRE DAME BON SECOURS,F-57038 METZ,FRANCE HOP GEN,F-24019 PERIGUEUX,FRANCE CTR HOSP,ANNECY,FRANCE CTR HOSP GEN,F-78104 ST GERMAIN LAYE,FRANCE CTR HOSP MANE LANNELONGUE,F-92350 LE PLESSIS ROBINS,FRANCE ANTIMICROBIAL RESISTANCE; INVITRO ACTIVITY; PNEUMOCOCCI; ANTIBIOTICS; AGENTS The MICs of teicoplanin and vancomycin were determined for 400 penicillin-susceptible and -resistant strains of Streptococcus pneumoniae isolated during a multicenter study in 1992. Teicoplanin displayed a four-fold better activity than vancomycin, with modal MICs of these agents being 0.06 and 0.25 mu g/ml, respectively. These data warrant further studies with teicoplanin in the treatment of pneumococcal infections. 21 2 JAN MX666 EUR J CLIN MICROBIOL INFECT D

Record 13 of 155 TURNER MS; MAALOUM M; AUSSERRE D; JOANNY JF; KUNZ M EDGE DISLOCATIONS IN COPOLYMER LAMELLAR FILMS JOURNAL DE PHYSIQUE II 1994, Vol 4, Iss 4, pp 689-702 TURNER MS, INST CHARLES SADRON,6 RUE BOUSSINGAULT,F-67083 STRASBOURG,FRANCE UNIV MAINE,URA 807,F-72017 LE MANS,FRANCE UNIV CAMBRIDGE,CAVENDISH LAB,CAMBRIDGE CB3 0HE,ENGLAND CIBA GEIGY AG,CH-4002 BASEL,SWITZERLAND NEUTRON REFLECTIVITY; DIBLOCK COPOLYMERS; LIQUID-CRYSTALS; FREE-SURFACE; THIN-FILMS; MICROSCOPY Thin films of symmetric diblock copolymers on a flat solid surface form lamellae parallel to the substrate. The uppermost layer of the film may be incomplete and made of domains with a thickness equal to the lamellar period L. We investigate these domains both theoretically and experimentally. The domain edge is associated with a dislocation in the lamellar order which has been observed by transmission electron microscopy. We extend the linear elasticity theory of smectic liquid crystals, to include the effect of the surface tension at the air-polymer interface. We calculate the surface profile above a domain edge and the position (depth) of the dislocation. This profile is studied by atomic force microscopy for polystyrene-polybutylmethacrylate films. The comparison between theoretical and experimental profiles allows an estimation of the smectic elastic constants and of the internal surface tension between the two blocks of the copolymer. 20 14 APR NE009 J PHYS II

Record 14 of 155 PONCINEPAILLARD F; CHEVET B; BROSSE JC MODIFICATION OF ISOTACTIC POLYPROPYLENE BY A COLD-PLASMA OR AN ELECTRON-BEAM AND GRAFTING OF THE ACRYLIC-ACID ONTO THESE ACTIVATED POLYMERS JOURNAL OF APPLIED POLYMER SCIENCE 1994, Vol 53, Iss 10, pp 1291-1306 PONCINEPAILLARD F, UNIV MAINE,CHIM & PHYSICOCHIM MACROMOLEC LAB,CNRS,URA 509,F-72017 LE MANS,FRANCE INST TEXT FRANCE,F-69132 ECULLY,FRANCE POLYETHYLENE; SURFACE Surface grafting of polymeric materials, such as films and fibers, may improve their reactive surface properties. Polypropylene active sites that should initiate a surface postgrafting can be formed by either nitrogen cold plasma or an electron-beam irradiation. The plasma-modified polymer surface is cross-linked and functionalized with primary amino groups and with oxidized groups, and it is almost not degraded. Electron-beam-modified polypropylene is also functionalized through an aging reaction, emphasized by a high radical concentration. In both cases, active surface films are susceptible to react with monomers in a postgrafting reaction. The grafting yield and rate of acrylic acid were shown to be dependent on the formed amino group concentration: The hydrophilic character of the modified polypropylene surface enhances the acrylic acid approach. The electron-beam treatment leads also to a reactive surface that can initiate a grafting reaction. But its yield and rate are dependent on the radical concentration: radicals formed during the irradiation. (C) 1994 John Wiley & Sons, Inc. 19 16 SEP 6 PC759 J APPL POLYM SCI

Record 15 of 155 VUILLEMIN B; BOHNKE O KINETICS STUDY AND MODELING OF THE ELECTROCHROMIC PHENOMENON IN AMORPHOUS TUNGSTEN TRIOXIDE THIN-FILMS IN ACID AND LITHIUM ELECTROLYTES SOLID STATE IONICS 1994, Vol 68, Iss 3-4, pp 257-267 UNIV MAINE,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE UFR SCI TECH,ELECTROCHIM SOLIDES LAB,CNRS,URA 436,F-25030 BESANCON,FRANCE The coupling of electrochemical and optical measurements allows us to point out that the kinetics of coloration of amorphous tungsten trioxide thin films (a-WO3) is slower than the kinetics of the electrochemical reaction. However it is shown that the electrochemical reaction is controlled by a resistance R which depends on the conductivities of the electrolyte, the MxWO3 bronze, and the transparent electronic conducting sublayer. The molar absorption coefficients (at lambda=633 nm) of both LixWO3 and HxWO3 are determined. From the experimental results, a model is proposed to describe the mechanism of the electrochromic process in a-WO3. According to this model, the kinetics of coloration is found to be controlled by the diffusion into the oxide of an intermediate species (M+, e-). The oxidation of this species by a W6+ ion leads to the formation of an absorbing center and to the coloration of the oxide. The diffusion coefficients of (Li+, e-) and (H+, e-) as well as the rate constants k of the corresponding redox reactions are determined. 17 11 MAR NT660 SOLID STATE IONICS

Record 16 of 155 RIOU D; FEREY G THE STRUCTURE OF THE INTERCALATE VOPO(4), 0.5 PIPERAZIN EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 1, pp 25-35 RIOU D, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE O MESSIAEN,F-72017 LE MANS,FRANCE HYDROTHERMAL SYNTHESIS; CRYSTAL; CHEMISTRY Hitherto unknown intercalate [N2C4H12]0.5VOPO4, has been isolated by low temperature hydrothermal synthesis. It is monoclinic (S.G. P2(1)/c (no 14)) with parameters a = 8.7906(4) angstrom, b = 8.2757(5) angstrom, c = 8.5617(4) angstrom, beta = 111.13(1)-degrees, V = 580.94(7) angstrom3, Z = 4 ). In this compound, the PO4 tetrahedra share their comers with four distorted V4+O5 trigonal bipyramids in order to build infinite VOPO4- layers stacked along 1100]. The diprotonated piperazin (N2C4H12)2+ is intercalated between the sheets and ensures the cohesion of the network by hydrogen bonding. A comparison between the topologies of the layers of alpha-VOPO4 and [N2C4H12]0.5VOPO4 is presented. and the distortion observed in the latter case is discussed in relation with hydrogen bonding. 15 11 NC331 EUR J SOLID STATE INORG CHEM

Record 17 of 155 BALDA R; FERNANDEZ J; MENDIOROZ A; ADAM JL; BOULARD B TEMPERATURE-DEPENDENT CONCENTRATION QUENCHING OF ND3+ FLUORESCENCE IN FLUORIDE GLASSES JOURNAL OF PHYSICS-CONDENSED MATTER 1994, Vol 6, Iss 4, pp 913-924 BALDA R, UNIV PAIS VASCO,ESCUELA TECN SUPER INGN IND & TELECOMUN,DEPT FIS APLICADA 1,E-48013 BILBAO,SPAIN UNIV RENNES,VERRES & CERAM LAB,CNRS,UA 1496,F-35042 RENNES,FRANCE UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,UA 449,F-72017 LE MANS,FRANCE OPTICAL-PROPERTIES; CROSS-SECTION; LASER; SPECTROSCOPY; EMISSION The optical properties and temperature-dependent concentration quenching of Nd3+ fluorescence have been investigated in heavy-metal and transition-metal fluoride glasses using steady-state and time-resolved laser spectroscopy. Judd-Ofelt parameters were derived from the absorption spectra and used to calculate the F-4(3/2) --> I-4(11/2) stimulated-emission cross-section and the F-4(3/2) radiative lifetime. From the thermal behaviour of lifetimes, a T-3 dependence for the non-radiative Nd-Nd relaxation processes has been found in the 15-100 K temperature range for the three families of fluoride glasses investigated, which is in agreement with a two-site non-resonant process. 15 12 JAN 24 MV114 J PHYS-CONDENS MATTER

Record 18 of 155 SERPAGGI F; LOISEAU T; RIOU D; FEREY G; HOSSEINI MW OXYFLUORINATED MICROPOROUS COMPOUNDS .9. SYNTHESIS AND CRYSTAL-STRUCTURE OF ULM-8 - A NEW LAYERED FLUORINATED GALLOPHOSPHATE GA3(PO4)2(HPO)4(H2O)F2, (N4C6H19) EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 7, pp 595-604 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE CTR RECH CHIM,CHIM ORGANOMINERALE LAB,CHIM SUPRAMOLEC,CNRS,URA 422,F-67008 STRASBOURG,FRANCE SOLIDS Ga3(PO4)2(HPO4)(H2O)F2, (N4C6H19) is a new oxyfluorinated gallophosphate obtained by hydrothermal synthesis with the tris (2-aminoethyl) amine used as template. It is orthorhombic with Pbca space group (n-degree 61) and the following cell parameters a = 10.163 (2) angstrom, b = 21.989 (5) angstrom, c = 17.279 (3) angstrom, Z = 8, V = 3861 (2) angstrom3. This new structure type is labelled ULM-8. ULM-8 presents a layered structure with the alternation along [010] of organic and inorganic layers. The latter sheets are built up from the corner sharing of hexameric secondary building units (SBU) of three PO4 tetrahedra, two trigonal bipyramids GaO4F and one octahedron GaO4F2 all corner-linked. The stability of the structure is ensured by hydrogen bonds between the H atoms of the amino groups and the anions of the mineral framework. 14 10 PR551 EUR J SOLID STATE INORG CHEM

Record 19 of 155 RIOU D; FEREY G OXYFLUORINATED MICROPOROUS COMPOUNDS .10. SYNTHESIS AND CRYSTAL-STRUCTURE OF ULM-9 - THE NEW LAYERED FLUORINATED GALLOPHOSPHATE GAF(PO4), 0.5 PIPERAZINE EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 7, pp 605-613 RIOU D, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE X-RAY A new oxyfluorinated gallophosphate GaF(PO4), 0.5(N2C4H12), labelled ULM-9, was isolated by hydrothermal synthesis using piperazine as template. Its structure, solved by single crystal X-ray diffraction, is triclinic with parameters: a = 5.1125(5)angstrom b = 6.3450(6)angstrom c = 8.981(1)angstrom alpha = 77.040(6)-degrees beta = 79.624(7)-degrees gamma = 89.711(5)-degrees, V = 279.08(5)angstrom3, Z = 2. ULM-9 is a layered compound constituted of inorganic layers of corner-shared PO4 tetrahedra and GaO4F trigonal bipyramids between them are inserted the piperazinium ions. This structure is closely related to VO(PO4), 0.5 piperazine. The substitution of the vanadyl bond (V=O)2+ by a (M(III)-F)2+ linkage is discussed. 14 9 PR551 EUR J SOLID STATE INORG CHEM

Record 20 of 155 LORENTZ G; TASSIN JF MOLECULAR DESCRIPTION OF CONSTANT-LOAD STRETCHING OF AMORPHOUS POLY(ETHYLENE-TEREPHTHALATE) FILMS POLYMER 1994, Vol 35, Iss 15, pp 3200-3205 UNIV MAINE,PHYSICOCHIM MACROMOLEC LAB,CNRS,URA 509,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE RHONE POULENC FILMS,MAGPHANE INT,F-01701 MIRABEL,FRANCE PET FILMS; ORIENTATION; RELAXATION POLY(ETHYLENE-TEREPHTHALATE) FILMS; PET FILMS; ORIENTATION; DEFORMATION This paper is devoted to a molecular description of the deformation of amorphous isotropic poly(ethylene terephthalate) (PET) films at temperatures slightly above the glass transition temperature under constant load. The deformation is qualitatively described by chain relaxation phenomena occurring before stress-induced crystallization, which are followed by the equilibration of a rubber-like network. The junction points include both trapped entanglements and crystalline units. The structure of this network is characterized by the number of segments between crosslinks. This parameter is calculated by comparing the predictions of the rubber elasticity theory (without Gaussian approximation) with the experimentally observed draw ratios under given conditions of temperatures and loads. It is shown that light loads induce soft networks leading to high draw ratios. The predictions of the molecular orientation derived from this treatment are in good agreement with birefringence data on a large variety of samples. 14 6 NZ515 POLYMER

Record 21 of 155 GIRODIER LD; ROUESSAC FP A NEW SYNTHETIC ROUTE TO OPTICALLY-ACTIVE ALPHA-ALKYL-2-FURYLCARBINOL AND 3-FURYLCARBINOL BY INTRAMOLECULAR DIASTEREOSELECTIVITY TETRAHEDRON-ASYMMETRY 1994, Vol 5, Iss 7, pp 1203-1206 GIRODIER LD, UNIV MAINE,FAC SCI,SYNTH ORGAN LAB,CNRS,URA 482,AVE O MESSIAEN,F-72017 LE MANS,FRANCE ENANTIOSELECTIVE ADDITION; ASYMMETRIC-SYNTHESIS; BUILDING-BLOCKS; ALDEHYDES; 2-FURYLCARBINOLS; 2-FURYLMETHANOLS; DERIVATIVES; DIETHYLZINC; SULFOXIDES; REAGENTS We report the results of intramolecular asymmetric alkylation of enantiomerically pure 2- and 3-furaldehydes containing a p-tolylsulfoxide group, thus providing an efficient method of obtaining optically active alpha-alkyl-2- and 3-furanmethanol of known configuration after cleavage of the sulfoxide group. In example, R and S alpha-phenyl-3-furanmethanol are described. 14 4 JUL NX313 TETRAHEDRON-ASYMMETRY

Record 22 of 155 BROWN W; NICOLAI T POLARIZED AND DEPOLARIZED LIGHT-SCATTERING OF CONCENTRATED POLYSTYRENE SOLUTIONS MACROMOLECULES 1994, Vol 27, Iss 9, pp 2470-2480 BROWN W, UNIV UPPSALA,DEPT PHYS CHEM,BOX 532,S-75121 UPPSALA,SWEDEN UNIV MAINE,PHYSICOCHIM MACROMOLEC LAB,CNRS,URA,F-72017 LE MANS,FRANCE PHOTON-CORRELATION SPECTROSCOPY; POLY(CYCLOHEXYL METHACRYLATE); RELAXATION; FLUCTUATIONS; DENSITY; GLASS; DIFFUSION; DYNAMICS; MIXTURES; NEUTRON Polarized and depolarized dynamic light scattering have been used to examine the dynamics of concentrated (0.7 < C < 1.0 g/mL) polystyrene solutions in dioctyl phthalate and toluene. Time-temperature superposition of the depolarized intensity correlation functions gave master curves covering more than 10 decades on the time scale. The polarized correlation functions are resolved by different procedures into relaxational and diffusive components having different temperature dependences. When the relaxation rate of the concentration fluctuations approaches the reorientational relaxation rate, the concentration fluctuations become q-independent; i.e., they become rate-determined by the polymer backbone mobility. With a small-molecule solvent such as toluene, however, a part of the concentration fluctuations relaxes faster than the orientational relaxation; i.e., the diffusion occurs in the free volume within the ''frozen' network. 13 11 APR 25 NJ226 MACROMOLECULES

Record 23 of 155 BOUTON C; PAGES G CONVERGENCE IN DISTRIBUTION OF THE ONE-DIMENSIONAL KOHONEN ALGORITHMS WHEN THE STIMULI ARE NOT UNIFORM ADVANCES IN APPLIED PROBABILITY 1994, Vol 26, Iss 1, pp 80-103 BOUTON C, UNIV MAINE,ROUTE LAVAL,BP 535,F-72017 LE MANS,FRANCE UNIV PARIS 06,PROBABILITES LAB,URA 224,F-75252 PARIS 05,FRANCE UNIV PARIS 01,UFR 27,F-75634 PARIS 13,FRANCE MARKOV CHAINS; DOEBLIN RECURRENCE; NEURAL NETWORKS We show that the one-dimensional self-organizing Kohonen algorithm (with zero or two neighbours and constant step epsilon) is a Doeblin recurrent Markov chain provided that the stimuli distribution mu is lower bounded by the Lebesgue measure on some open set. Some properties of the invariant probability measure nu(epsilon) (support, absolute continuity, etc.) are established as well as its asymptotic behaviour as epsilon down 0 and its robustness with respect to mu. 13 24 MAR MZ755 ADVAN APPL PROBAB

Record 24 of 155 DECHAMPCHESNEL JBF; BOWER DI; WARD IM; TASSIN JF; LORENTZ G DEVELOPMENT OF MOLECULAR-ORIENTATION IN SEQUENTIALLY DRAWN PET FILMS POLYMER 1993, Vol 34, Iss 18, pp 3763-3770 UNIV LEEDS,IRC POLYMER SCI & TECHNOL,LEEDS LS2 9JT,W YORKSHIRE,ENGLAND UNIV MAINE,FAC SCI,PHYS CHIM MACROMOLECUL LAB,F-72017 LE MANS,FRANCE MAGPHANE INT,RHONE POULENC FILMS,F-01701 MIRABEL,FRANCE MOLECULAR ORIENTATION; PET FILMS; INFRARED SPECTROSCOPY; X-RAY DIFFRACTION POLY(ETHYLENE-TEREPHTHALATE) A study has been made of the transverse stretching of poly(ethylene terephthalate) film previously drawn longitudinally at constant force and width. The crystalline phase has been characterized using wide-angle X-ray diffraction: the orientation of the chain axis and the normal to the phenylene ring have been determined, as well as the crystallite size. Infra-red spectroscopy and refractive index measurements have been used to characterize the orientation of the material averaged over the crystalline and amorphous phases. The results showed that the crystals, which were preferentially aligned with their chain axes along the first stretching (longitudinal) direction, break down during the second drawing and that recrystallization takes place to produce crystallites with their c-axes aligned along the transverse stretching direction. The observed increase in the tendency for the normal to the phenylene ring to be normal to the film plane correlates with the increase in crystallite size along the chain axis for crystallites oriented with their chain axes in the transverse direction. 13 8 LY786 POLYMER

Record 25 of 155 LOISEAU T; RIOU D; LICHERON M; FEREY G SYNTHESIS AND X-RAY STRUCTURAL DETERMINATION OF A NEW HYDROXYGALLOPHOSPHATE GA3P3O12(OH), H3C-NH2-CH3 ISOTYPIC WITH ALPO4-21 JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 111, Iss 2, pp 397-402 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE CTR RECH PHYS HAUTES TEMP,CNRS,UPR 4212,F-450071 ORLEANS 2,FRANCE 4-CONNECTED 3-DIMENSIONAL NETS; OXYFLUORINATED MICROPOROUS COMPOUNDS; FRAMEWORK SILICATES; CRYSTAL-STRUCTURE; MOLECULAR-SIEVES; CLASSIFICATION; ENUMERATION; ALUMINOPHOSPHATE; GALLOPHOSPHATE; SOLIDS Ga3P3O12(OH), H3C-NH2-CH3 was obtained by hydrothermal synthesis (453 K, autogeneous pressure, 24 hr) from a mixture of Ga2O3, P2O5, HF, dimethylamine and H2O in the ratio 1:1:2:2:80. It is monoclinic (space group P2(1)/n (No. 14)) with a = 8.787(1) angstrom, b = 17.783(3) angstrom, c = 9.204(1) angstrom, beta = 109.56(1)degrees, V = 1355.2(5) angstrom3, Z = 4. It belongs to the AlPO4-21 (or GaPO4-C4) structure type. The three-dimensional network is built up from corner-linked [Ga3(PO4)3(OH)] units composed of three PO4 tetrahedra, two trigonal bipyramids, and one tetrahedron of gallium. As previously described, the framework delimits three-, four-, five-, and eight-membered rings. The protonated amine is inserted in the eight-membered tunnels which are along [100] and [001]. The hydrogen bonding scheme is discussed. (C) 1994 Academic Press, Inc. 12 6 AUG PC615 J SOLID STATE CHEM

Record 26 of 155 MARTIN G; GRUPPE SG; LAULIER M; BOUCHON D; RIGAUD T; JUCHAULT P EVIDENCE FOR WOLBACHIA SPP IN THE ESTUARINE ISOPOD SPHAEROMA-RUGICAUDA (CRUSTACEA) - A LIKELY CYTOPLASMIC SEX-RATIO DISTORTER ENDOCYTOBIOSIS AND CELL RESEARCH 1994, Vol 10, Iss 3, pp 215-225 MARTIN G, UNIV POITIERS,BIOL ANIM LAB,CNRS,URA 1452,40 AV RECTEUR PINEAU,F-86022 POITIERS,FRANCE UNIV MANS,FAC SCI,BIOL ANIM LAB,F-72017 LE MANS,FRANCE UNIV ESSEX,DEPT BIOL,COLCHESTER CO4 3SQ,ESSEX,ENGLAND FLABELLIFERA; ONISCIDEA; INTRACELLULAR BACTERIA; CYTOPLASMIC SEX DETERMINATION; PCR; TRANSMISSION ELECTRON MICROSCOPY ARMADILLIDIUM-VULGARE LATR; PARASITE; TRANSMISSION; EVOLUTION; ANIMALS This paper describes the first evidence for endocytobiotic Wolbachia-related bacteria in an estuarine crustacean, the isopod Sphaeroma rugicauda. Four populations were studied (one from Calvados [France] and three from East Anglia [UK]), in which females and intersexes from female-biased progenies were infected. No bacteria were found in males regardless of their origin, or in the females from most progenies having 1:1 sex ratios. These characteristics are very similar to those of the cytoplasmic sex determination in the terrestrial isopod Armadillidium vulgare. In this species, Wolbachia overrides genetic sex determination, feminizes genetic males and induces the production of highly female-biased broods by infected mothers. 11 11 NOV PW677 ENDOCYTOBIOSIS CELL RES

Record 27 of 155 CAVELLEC M; RIOU D; FEREY G OXYFLUORINATED MICROPOROUS COMPOUNDS .6. SYNTHESIS AND CRYSTAL-STRUCTURE OF ULM-4 - A NEW-TYPE OF FLUORINATED GALLOPHOSPHATE WITH ENCAPSULATED METHYLAMINE EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 7, pp 583-594 CAVELLEC M, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE MOLECULAR-SIEVES; SOLIDS [Ga3(PO4)3F2],(CH3-NH3)2,H2O a new oxyfluorinated gallophosphate with an open framework, named ULM-4 (University of Le Mans), has been obtained by hydrothermal synthesis using methylamine as organic template. This new structure type can also be synthesized with ethylenediamine or 1.3 diaminopropane. The structure was solved by single crystal X-ray diffraction. ULM-4, methylamine crystallizes in space group P2(1)/n with cell parameters a = 8.672(1) angstrom, b = 10.1867(7) angstrom, c = 16.788(2) angstrom, beta = 93.12(2)-degrees, Z = 4, V = 1480.8(3) angstrom3, R = 0.023, wR2 = 0.063 for 3621 independent reflections. The three dimensional network is built up from corner linked hexameric [Ga3 (PO4)3 F2]2-units, which are composed of three PO4 terahedra, two GaO4F trigonal bipyramids and one GaO4F2 octahedron. The polyhedral arrangement delimits interconnected 10-membered ring tunnels along [010] in which the organic template are located, and also 8-membered ones along [100]. 11 12 PR551 EUR J SOLID STATE INORG CHEM

Record 28 of 155 CAMMAS S; BOUTAULT K; HUET F; GUERIN P 4-ALKYLOXYCARBONYL-2-OXETANONES WITH 2 STEREOGENIC CENTERS AS PRECURSORS OF MALIC-ACID ALKYL ESTERS POLYSTEREOISOMERS TETRAHEDRON-ASYMMETRY 1994, Vol 5, Iss 8, pp 1589-1597 ECOLE NATL SUPER CHIM RENNES,CHIM BIOL & MACROMOLEC LAB,CNRS,URA 1467,F-35700 RENNES,FRANCE UNIV MAINE,SYNTH ORGAN LAB,CNRS,URA 482,F-72017 LE MANS,FRANCE INVITRO Racemic and optically active 4-alkyloxycarbonyl-2-oxetanones containing two stereogenic centers have been prepared starting from racemic, (R) or (S) aspartic acid or malic acid as chiral synthons and by introducing an asymmetric alkyl ester group (2-methylbutyl) in the course of a beta-substituted-beta-lactone synthesis route. Different stereoisomers of the 4-[(2'-methyl)butyloxycarbonyl]-2-oxetanone have been prepared and characterized. It has been shown by using 400 MHz H-1 NMR and Eu(hfc)(3) as chiral shift reagent that enantiomeric or diastereomeric excess as high as 98 % could be retained during the synthesis route according to the specific experimental conditions. High molecular weight racemic and optically active poly(2-methylbutyl beta-malate) have been prepared by anionic ring opening polymerization of the monomer feed. At last, it has been shown that racemic or optically active poly (2-methylbutyl beta-malate-co-beta-malic acid) can be obtained by copolymerization of 4-[(2'-methyl)butyloxycarbonyl]-2-oxetanone and 4-benzyloxycarbonyl-2-oxetanone and further catalytic hydrogenolysis of the benzyl protecting groups. 11 9 AUG PC678 TETRAHEDRON-ASYMMETRY

Record 29 of 155 LEBIDEAU J; JOUANNEAUX A; PAYEN C; BUJOLI B NOVEL STRUCTURAL ARRANGEMENT FOR DIVALENT METAL PHOSPHONATES - SYNTHESIS OF TERT-BUTYLPHOSPHONATES AND STRUCTURE OF CO[(CH3)3CPO3].H2O JOURNAL OF MATERIALS CHEMISTRY 1994, Vol 4, Iss 8, pp 1319-1323 LEBIDEAU J, FAC SCI & TECH NANTES,IMN,CNRS,UMR 110,2 RUE HOUSSINIERE,F-44072 NANTES 03,FRANCE FAC SCI & TECH,SYNTHESE ORGAN LAB,CNRS,URA 475,F-44072 NANTES 03,FRANCE UNIV MAINE,FAC SCI,RESONANCE MAGNET LAB,F-72017 LE MANS,FRANCE HYDROTHERMAL SYNTHESIS; CRYSTAL-STRUCTURES; ORGANOPHOSPHONATES; CHEMISTRY; CALCIUM The synthesis and characterization of new divalent metal tert-butylphosphonates are described: M(II)[(CH3)3CPO3].xH2O [M(II)=Co, Mn (x=1); M(II)=Zn (x=2/3)] and Cu1.75O0.75[(CH3)3CPO3].H2O . Co[(CH3)3CPO3].H2O crystallizes in the monoclinic space group P2(1)/c with a=12.256(1) angstrom, b=17.939(1) angstrom, c=10.769(1) angstrom, beta=93.57(1)-degrees, V=2363.1(4) angstrom3, Z=12, with R=0.064 and R(w)=0.075 for 1805 observed reflections, according to the criterion 1>3sigma(I). The layer arrangement of this new phase is different from that observed in the case of the n-alkyl M(II)(RPO3).H2O analogues owing to the steric effect of the bulky tert-butyl group. The structural relationship between the cobalt, manganese and zinc compounds is discussed. The observed magnetic moments are consistent with the presence of high-spin Mn(II) or Co(II) and with the existence of both octahedral and tetrahedral environments about these metals. 11 5 AUG PB796 J MATER CHEM

Record 30 of 155 DUJARDIN G; ROSSIGNOL S; MOLATO S; BROWN E ASYMMETRIC-SYNTHESIS AND ABSOLUTE-CONFIGURATION OF SUBSTITUTED DIHYDROPYRANS, BY INTRAMOLECULAR HETEROCYCLOADDITION OF CHIRAL VINYL ETHERS TETRAHEDRON 1994, Vol 50, Iss 30, pp 9037-9050 DUJARDIN G, UNIV MAINE,CNRS,ORGAN SYNTH LAB,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE DIELS-ALDER-REACTIONS; ENOL ETHERS; DENOVO-SYNTHESIS; NATURAL-PRODUCTS; CYCLO-ADDITIONS; HIGH-PRESSURE; DIENOPHILES; DERIVATIVES; AUXILIARIES; INDUCTION The alkyl vinyl ethers 2b-8b (deriving from the alcohols 2a-8a) smoothly reacted with methyl E-benzylidenepyruvate 10 in the presence of catalytic amounts of Eu(fod)(3) or Yb(fod)(3) in refluxing hexane, thus leading to the dihydropyran endo adducts 13-19 in high yields (80-95%). The endo-cycloadducts 13-17 were obtained with diastereofacial selectivities (ds) ranging from 76/24 to 87.5/12.5. Asymmetric induction was found to culminate with the vinyl ether (-)-7b deriving from n-butyl (R)-(-)-mandelate : the best ds (92.5/7.5) was obtained for the corresponding adduct 18 after 6 days at room temperature. The absolute configurations of the major isomers of the dihydropyrans 16-18, 20 and 21 were established by oxydative degradation to optically active alpha-phenylsuccinic acid derivatives. 11 14 JUL 25 NZ183 TETRAHEDRON

Record 31 of 155 MEVELLEC L; HUET F NOVEL CYCLOBUTANE CARBOCYCLIC NUCLEOSIDES TETRAHEDRON 1994, Vol 50, Iss 46, pp 13145-13154 MEVELLEC L, UNIV MAINE,FAC SCI,SYNTH ORGAN LAB,CNRS,URA 482,BP 535,F-72017 LE MANS,FRANCE C-13 MAGNETIC-RESONANCE; OXETANOCIN; ANALOGS; PURINES Epoxidation of cis-3,4-bis(benzyloxymethyl)cyclobut-1-ene 4 gave compounds 7a and 7b which were separated Reaction of the cis-epoxide 7a with adenine led to the N-9 and N-7 attack products, 10a and 10b, respectively. In the same conditions, the trans-epoxide 7b yielded the N-9 product 12. Nucleoside analogues 11 and 13 were obtained by debenzylation of 10a and 12, respectively. 10 10 NOV 14 PT050 TETRAHEDRON

Record 32 of 155 LAPERSONNE P; TASSIN JF; MONNERIE L UNIAXIAL PLANAR DEFORMATION OF PET FILMS .2. CHARACTERIZATION OF THE ORIENTATION FROM MEASUREMENTS OF REFRACTIVE-INDEXES POLYMER 1994, Vol 35, Iss 10, pp 2192-2196 UNIV MAINE,CNRS,UNITE 509,PHYSICOCHIM MACROMOLEC LAB,F-72017 LE MANS,FRANCE ECOLE SUPER PHYS & CHIM IND VILLE PARIS,CNRS,UNITE 278,PHYSICOCHIM STRUCT & MACROMOLEC LAB,F-75231 PARIS 05,FRANCE BIAXIAL ORIENTATION; REFRACTIVE INDEXES; PET FILMS MOLECULAR-ORIENTATION; POLY(ETHYLENE-TEREPHTHALATE) FILMS; CONFORMATIONAL-CHANGES; BIAXIAL ORIENTATION; CONSTANT LOAD; TEREPHTHALATE); POLYMERS; RAMAN Refractive indices along the three principal directions of uniaxial planar deformed poly(ethylene terephthalate) (PET) films have been used to calculate the second moments of the orientation distribution of the phenyl ring's normal with respect to the three principal directions of the sample. Under our stretching conditions, the phenyl rings show a strong tendency to orient their plane parallel to the plane of the films. The orientation of the chain axis can also be evaluated from the same data. A good correlation is observed between this indirect measurement and direct, but more tedious, techniques such as infra-red dichroism. 10 5 NL313 POLYMER

Record 33 of 155 LENOIR S; GRANDJEAN H; LELOUP M; CLARIS O; HASCOET J SHORT AND MIDTERM OUTCOME OF 1157 NEONATES WITH RESPIRATORY-DISTRESS-SYNDROME ARCHIVES DE PEDIATRIE 1994, Vol 1, Iss 11, pp 1004-1010 LENOIR S, HOP LA GRAVE,INSERM,CJF 8908,F-31052 TOULOUSE,FRANCE HOP EDOUARD HERRIOT,SERV REANIMAT NEONATALE,F-69437 LYON 03,FRANCE SERV REANIMAT NEONATALE,F-54042 NANCY 03,FRANCE HOP NORD AMIENS,AMIENS,FRANCE CTR HOSP ARRAS,ARRAS,FRANCE HOP ENFANTS,BORDEAUX,FRANCE HOP MORVAN,BREST,FRANCE CHU CAEN,CAEN,FRANCE HOP ANTOINE BECLERE,CLAMART,FRANCE CTR HOSP REG & UNIV DIJON,DIJON,FRANCE CTR HOSP LE MANS,LE MANS,FRANCE HOP ST ANTOINE,LILLE,FRANCE CHU LIMOGES,LIMOGES,FRANCE HOP DEBROUSSE,LYON,FRANCE HOP SUD,LYON,FRANCE HOP ST CHARLES,MONTPELLIER,FRANCE CTR HOSP REG & UNIV NANTES,NANTES,FRANCE HOP NECKER ENFANTS MALAD,PARIS,FRANCE CTR HOSP PAU,PAU,FRANCE CTR HOSP PONTOISE,PONTOISE,FRANCE HOP CIMIEZ,F-06003 NICE,FRANCE CTR HOSP INTERCOMMUNAL,POISSY,FRANCE AMER MEM HOSP,REIMS,FRANCE HOP PONTCHAILLOU,RENNES,FRANCE HOP NORD ST ETIENNE,ST ETIENNE,FRANCE HOP BELAIR,THIONVILLE,FRANCE HOP PURPAN,TOULOUSE,FRANCE HOP CLOCHEVILLE,TOURS,FRANCE RESPIRATORY DISTRESS SYNDROME; FOLLOW-UP STUDIES; EPIDEMIOLOGY; INFANT; NEONATE; INFANT PREMATURE SYNTHETIC SURFACTANT; BIRTH-WEIGHT; INFANTS; MORTALITY; MORBIDITY; GRAMS; LESS Background. - Data concerning neonates with acute respiratory distress syndrome (RDS) are still scarce. The characteristics and follow-up of a French cohort which has participated in an international trial concerning the efficacy of artificial surfactant have been studied. Population and methods. - One thousand one hundred and fifty-seven neonates admitted from October 1990 to December 1991 in 27 French intensive care units because of RDS due to hyaline membrane disease were included in the study, whatever their birthweight and gestational age (GA). Results. - Three hundred and sixteen neonates (27.3%) were born from twin or multiple pregnancies. Fourty-five (5.5%) of the mothers had been given corticosteroids for the week preceding delivery. 55.5% were delivered by cesarean section. Mean GA was 31.0 +/- 2.9 weeks and mean birth-weight was 1603 +/- 625 g. Two hundred and sixty-six neonates (23%) were small for GA. Two hundred and twenty-three died after a mean survival of 4.2 days (63% before the end of the first week and 80% before the end of the third week). Fifty percent of these deaths were due to respiratory distress, 28% to severe brain disorders and 9% to infections. The bronchopulmonary dysplasia rare was 21.7%. Early ultrasound scan of the brain showed major injuries in 19.5% of cases; the second scan performed in 822 infants was normal in 84.3%. Conclusions. - Taking into account GA, mortality and morbidity rates were similar to those of the other non-French participating centres. 9 7 NOV PU506 ARCHIVES PEDIATRIE

Record 34 of 155 BROWN N; CASTAGNEDE B; LAURIKS W; MELON M EXPERIMENTAL-STUDY OF THE DISPERSION OF ULTRASONIC-WAVES IN POROUS MATERIALS COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II 1994, Vol 319, Iss 4, pp 393-399 BROWN N, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,AVE O MESSIAEN,F-72017 LE MANS,FRANCE KATHOLIEKE UNIV LEUVEN,AKOSTIEK & WARMTEGELEIDING LAB,B-3001 LOUVAIN,BELGIUM SOLIDS This Note discusses the dispersion that occurs in acoustic materials saturated by air at medium ultrasonic frequencies (in the 50-400 kHz range). A standard algorithm based on the phase spectrum (W. Sachse and H. Y. Pao, J. Appl. Phys., 49, 1978, p. 4320) is used to calculate the phase velocities versus frequency. Some measurements are performed on a plastic foam. The asymptotic value of the phase wavespeed directly provides the coefficient of tortuosity. Complementary measurements of the phase velocity conducted with narrow-band piezoelectric transducers are in good agreement with the dispersion curves. Further experiments are performed on water-saturated samples. 9 7 AUG 18 1 PD684 C R ACAD SCI SER II

Record 35 of 155 KRIMPHOFF J; MCADAMS S; WINSBERG S CHARACTERIZATION OF THE TIMBER OF COMPLEX SOUNDS .2. ACOUSTIC ANALYSIS AND PSYCHOPHYSICAL QUANTIFICATION JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 625-628 KRIMPHOFF J, IRCAM,1 PL STRAVINSKY,F-75004 PARIS,FRANCE UNIV MAINE,UFR SCI,ACOUST LAB,CNRS,F-72017 LE MANS,FRANCE UNIV PARIS 05,PSYCHOL EXPTL LAB,F-75270 PARIS 06,FRANCE MUSICAL TIMBRES A timbre space represents the mental organization of sound events at equal pitch, loudness, and duration. The geometric distance between two timbres corresponds to their degree of perceived dissimilarity. The dimensions of such a three-dimensional space, established by Krumhansl [1] for a set of 21 synthesized sounds, were investigated with respect to their acoustic characteristics. Several acoustical parameters based on the temporal and frequency properties of the sounds were calculated. The high degree of correlation of several parameters with the perceptual axes lend support to previous interpretations of the qualitative character of two perceptual dimensions and their semantic attributes. The perceptual dimensions ''brightness'' and ''rapidity of attack,'' turn out to be quantitatively explainable by the center of gravity of the sound spectrum (CGS) and the rise time on a logarithmic scale (LTM), respectively. The third dimension, initially called ''spectral flux'' corresponds partially to the standard deviation of the time-averaged harmonic amplitudes from a spectral envelope (IRR). A new verbal descritor, ''spectral fine structure'' seems to fit better with the results of acoustic analyses. 9 4 MAY 1 NT300 J PHYS IV

Record 36 of 155 DEBAUDMINOREL AM; BUZARE JY THE INFLUENCE OF SUBSTITUTIONAL DISORDER ON THE STRUCTURAL PHASE-TRANSITIONS IN RB(1-X)K(X)CAF3 (X LESS-THAN-OR-EQUAL-TO 0.2) MIXED PEROVSKITE CRYSTALS JOURNAL OF PHYSICS-CONDENSED MATTER 1994, Vol 6, Iss 11, pp 2189-2206 DEBAUDMINOREL AM, UNIV MAINE,EQUIPE PHYS ETAT CONDENSE,CNRS,URA 807,AVE O MESSIAEN,F-72017 LE MANS,FRANCE CRITICAL-BEHAVIOR; RBCAF3; EPR; RB1-XKXCAF3; SCATTERING The influence of ionic substitution on the phase transitions in mixed Rb1-xKxCaF3 fluoroperovskite crystals (x less-than-or-equal-to 0.2) is studied by EPR of the Gd3+-O2- pair substituted for a Ca2+-F- bond as a local probe. The behaviour of the EPR Spectra versus temperature reveals the existence of two successive first-order phase transitions associated with CaF6 octahedron rotation. Computer reconstructions of the EPR spectra allow us to conclude that, in the low-temperature phase, the CaF6 octahedra are rotated by three equal angles around the fourfold cubic axes. Then, we were able to determine the variations of the total rotational angle phi defined by phi2 = phi[100]2 + phi[010]2 + phi[001]2 = 3phi[001]2. It is observed to increase continuously for x = 0.05 whereas a discontinuity towards larger values occurs in the x = 0.2 compound. The phase diagram drawn from the EPR measurements shows that the transition temperatures are enhanced with increasing x and the temperature range over which the tetragonal phase exists tends to become smaller. These results lead to the conclusion that the occurrence of the phase transitions is related to the compactness of the unit cell and that the substitution enhances the instabilities at the M and R points of the Brillouin zone. 9 18 MAR 14 NB125 J PHYS-CONDENS MATTER

Record 37 of 155 LAFONTAINE MA; GRENECHE JM; LALIGANT Y; FEREY G BETA-CU3FE4(VO4)(6) - STRUCTURAL STUDY AND RELATIONSHIPS - PHYSICAL-PROPERTIES JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 108, Iss 1, pp 1-10 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE UNIV MAINE,FAC SCI,EQUIPE PHYS ETAT CONDENSE,CNRS,URA 807,F-72017 LE MANS,FRANCE CRYSTAL-STRUCTURE; IZALCO VOLCANO; EL-SALVADOR; X-RAY; SUBLIMATE 9 10 JAN MU325 J SOLID STATE CHEM

Record 38 of 155 CAVELLEC M; RIOU D; FEREY G SYNTHETIC SPHENISCIDITE ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS 1994, Vol 50, pp 1379-1381 CAVELLEC M, UNIV MAINE,FAC SCI,FLOURURES LAB,URA 449,F-72017 LE MANS,FRANCE Spheniscidite, ammonium hydroxide iron phosphate dihydrate, [Fe2(NH4)(OH)(PO4)2].2H2O, is known as a mineral isotypic with leucophosphite. Crystals were obtained by hydrothermal synthesis at medium temperature. The crystal structure determination confirms the leucophosphite structure type and provides detailed localization of the water molecules and ammonium cations inside the cavities of the framework. 8 3 SEP 15 9 PK710 ACTA CRYSTALLOGR C-CRYST STR

Record 39 of 155 BOUMRICHE A; GESLAND JY; BULOU A; ROUSSEAU M; FOURQUET JL; HENNION B STRUCTURE AND DYNAMICS OF THE INVERTED PEROVSKITE BALIF3 SOLID STATE COMMUNICATIONS 1994, Vol 91, Iss 2, pp 125-128 BOUMRICHE A, UNIV MAINE,PHYS ETAT CONDENSE LAB,URA 807,F-72017 LE MANS,FRANCE UNIV MAINE,FLUORURES LAB,URA 449,F-72017 LE MANS,FRANCE CENS,CEA,CNRS,LEON BRILLOUIN LAB,F-91192 GIF SUR YVETTE,FRANCE NEUTRON-SCATTERING; PHASE-TRANSITIONS; LATTICE-DYNAMICS; DISPERSION; FLUORIDE; KZNF3 X-ray diffraction data recorded with a four-circle diffractometer prove that BaLiF3 is one of the rare example of inverted perovskite. The low frequency phonon spectrum is investigated by inelastic neutron scattering and the whole spectrum is calculated using a rigid ion model. An estimation of the phonon density of states is deduced. 8 4 JUL NX943 SOLID STATE COMMUN

Record 40 of 155 LEVARD G; WEIL D; BARRET D; BARBIER J TORSION OF THE GALLBLADDER IN CHILDREN JOURNAL OF PEDIATRIC SURGERY 1994, Vol 29, Iss 4, pp 569-570 LEVARD G, CTR HOSP REG & UNIV POITIERS,DEPT SURG,DIV PEDIAT SURG,BP 577,F-86021 POITIERS,FRANCE CTR HOSP REG & UNIV POITIERS,DEPT RADIOL,POITIERS,FRANCE LE MANS HOSP,DEPT PEDIAT SURG,LE MANS,FRANCE GALLBLADDER; TORSION 8 2 APR NF972 J PEDIAT SURG

Record 41 of 155 DHAL R; LANDAIS Y; LEBRUN A; LENAIN V; ROBIN JP RUTHENIUM DIOXIDE IN FLUORO ACID-MEDIUM .5. APPLICATION TO THE NON PHENOLIC OXIDATIVE COUPLING OF DIARYLBUTANES - CONFORMATIONAL STUDIES OF CIS AND TRANS DEOXYSCHIZANDRINS TETRAHEDRON 1994, Vol 50, Iss 4, pp 1153-1164 UNIV MAINE,INST TECHNOL,DEPT CHIM,F-72017 LE MANS,FRANCE RUTHENIUM DIOXIDE; DIARYLBUTANES; DEOXYSCHIZANDRINS; ARYLTETRALINS LIGNANS; CONSTITUENTS; TETRAKIS(TRIFLUOROACETATE); EUPODIENONE-1; STEGANACIN; SKELETON; ACCESS; AGENT Ruthenium (IV) dioxide dihydrate in fluoro acidic medium was found to be a very efficient agent for the non phenolic oxidative coupling of diarylbutanes. We observed along with the expected aryl-aryl coupling, an unusual aryl-benzyl coupling, leading to a known class of lignans, the aryltetralins. Conformational studies of resultant cis and trans deoxyschizandrins were performed using high resolution NMR and molecular models. 8 12 JAN 24 MT545 TETRAHEDRON

Record 42 of 155 LOISEAU T; FEREY G CRYSTAL-STRUCTURE OF NH4[GA2(PO4)2(OH)(H2O)], H2O, ISOTYPIC WITH ALPO4-15 EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 7, pp 575-581 LOISEAU T, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE OXYFLUORINATED MICROPOROUS COMPOUNDS; GALLOPHOSPHATE; TEMPLATE NH4[Ga2(PO4)2(OH)(H2O)],H2O was obtained in a pure form by hydrothermal synthesis (453 K, 24 h, autogeneous pressure) from a mixture of Ga2O3, P2O5, HF, guanidine and H2O in the ratio 1:2:2:1.3:80. It is monoclinic (space group P2(1)/n (n-degree-14)) with a = 9.689(1) angstrom, b = 9.703(1) angstrom, c = 9.788(1) angstrom, beta = 102.78(2)-degrees, V = 897.4(4) angstrom3, Z = 4. The structure, refined to R(W) = 0.026, R = 0.025, is similar to the previously described Ga(PO4), 2 H2O, leucophosphite, AlPO4-15 and GaPO4-C7. The framework is built up from corner linked octameric [Ga4(PO4)4(OH)2(H2O)2] units, in which gallium is exclusively in octahedral coordination. NH4+ ions and one half of the water molecules are inserted in the cavities between the octamers. 7 7 PR551 EUR J SOLID STATE INORG CHEM

Record 43 of 155 ULMANN L; BLOND JP; POISSON JP; BEZARD J INCORPORATION OF DELTA(6)-DESATURATION AND DELTA(5)-DESATURATION FATTY-ACIDS IN LIVER MICROSOMAL LIPID CLASSES OF OBESE ZUCKER RATS FED N-6 OR N-3 FATTY-ACIDS BIOCHIMICA ET BIOPHYSICA ACTA-LIPIDS AND LIPID METABOLISM 1994, Vol 1214, Iss 1, pp 73-78 ULMANN L, UNIV MAINE,DEPT APPL BIOL,IUT LE MANS,RUE CHRISTIAN ELVA,BP 98,F-53021 LAVAL,FRANCE UNIV BOURGOGNE,FAC SCI MIRANDE,UNITE RECH NUTR CELLULAIRE & METAB,F-21004 DIJON,FRANCE DELTA(5)-DESATURATION; DELTA(6)-DESATURATION; FATTY ACID; LIVER; (RAT) DESATURASE ACTIVITIES; SUNFLOWER OIL; AGE; METABOLISM; PHOSPHOLIPIDS; INSULIN; DIET The aim of this work was to study the effect of dietary n-6 (as borage oil) and of n-3 (as fish oil) fatty acids on the incorporation - in liver microsomal lipid classes - of fatty acids involved in Delta(6)- and Delta(5)-desaturations in obese Zucker rats compared with their lean littermates and with Wistar control rats. We observed that body and liver weights were decreased when obese Zucker rats were fed the fish oil diet. The major part of the radioactivity was recovered, in the obese Zucker rats, into the neutral lipids and especially into the triacylglycerols, while it was recovered into the phospholipid classes, especially into phosphatidylcholine, in the two other strains. Results show, in all phenotypes, an increased alpha-linolenic acid Delta(6)-desaturation in PL classes when the rats were fed the fish oil diet. However, a decreased linoleic acid Delta(6)- and Delta(5)-desaturation was observed in obese Zucker rats fed the fish oil diet. The fish oil diet favours the n-3 fatty acid biosynthesis and incorporation into liver microsomal lipid classes to the prejudice of the n-6 fatty acid series. The fatty acid incorporation is simultaneously regulated by the genetical phenotype and dietary fatty acids. 7 6 AUG 25 PF366 BBA-LIPID LIPID METAB

Record 44 of 155 FULTON S; COWLEY RA; DESERT A; MASON T THE STATIC AND DYNAMIC CRITICAL-BEHAVIOR OF THE 2-DIMENSIONAL HEISENBERG-ANTIFERROMAGNET KFEF4 JOURNAL OF PHYSICS-CONDENSED MATTER 1994, Vol 6, Iss 33, pp 6679-6690 FULTON S, UNIV OXFORD,CLARENDON LAB,OXFORD,ENGLAND RISO NATL LAB,DK-4000 ROSKILDE,DENMARK UNIV MAINE,PHYS ETAT CONDENSE LAB,F-72017 LE MANS,FRANCE LOW-TEMPERATURES; SPIN CORRELATIONS; SUPERCONDUCTIVITY; LA2CUO4; WAVES; MODEL; PURE KFeF4 is a well characterized planar antiferromagnet with S = 5/2, and is an excellent example of a two-dimensional Heisenberg antiferromagnet. Using neutron-scattering techniques, a study of both the static and dynamic critical behaviour above the Neel temperature, T(N) = 136.75 +/- 0.35 K, has been undertaken. It is found that in the region above 1.04T(N), the static correlation length, the structure-factor peak intensity and the width of the dynamic scattering are all qualitatively described by the theories developed for Heisenberg antiferromagnets. The data have been compared with both the theory for a quantum Heisenberg antiferromagnet, as developed for La2CuO4, and also the model for a classical Heisenberg antiferromagnet. Both these theories describe the data equally well. Below 1.04T(N) the system is expected to behave like a two-dimensional Ising system. 7 12 AUG 15 PC866 J PHYS-CONDENS MATTER

Record 45 of 155 PONCINEPAILLARD F; CHEVET B; BROSSE JC STUDY OF AN ARAMID SURFACE REACTIVITY - MODIFICATION WITH A COLD-PLASMA OR AN ELECTRON-BEAM FOLLOWED BY A POSTGRAFTING REACTION JOURNAL OF APPLIED POLYMER SCIENCE 1994, Vol 52, Iss 8, pp 1047-1061 PONCINEPAILLARD F, UNIV MAINE,CHIM & PHYSICOCHIM MACROMOLEC LAB,CNRS,URA 509,F-72017 LE MANS,FRANCE INST TEXT FRANCE,F-69132 ECULLY,FRANCE INTERFACE; FIBERS Different modes of activation are described for a postgrafting reaction of acrylic acid on poly(p-phenylene terephthalamid) (PPTA):nitrogen plasma or electron-beam irradiation. Both lead to surface radical formation, and these species are able to initiate grafting. The functionalization through amino group attachment is characteristic of plasma treatment. Degradation initiated by UV-visible emission of plasma is noticed, leading to the amide clivage. The surface grafting is more important when the PPTA is irradiated with a cold plasma and if water is used as the solvent. The polymer crystallinity degree reduces the grafting of the electron beam-irradiated PPTA even with a high radical concentration. (C) 1994 John Wiley & Sons, Inc. 7 15 MAY 23 NH494 J APPL POLYM SCI

Record 46 of 155 FRESNEAU M; LEGAL G; KHATER A MAGNETIZATION CURVES OF A SPIN-1/2 BILAYER SYSTEM (A2) (APB1-P)1 (B)2 WITH DISORDERED INTERFACES JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 1994, Vol 130, Iss 1-3, pp 63-72 UNIV MAINE,PHYS MAT LAB,CNRS,URA 807,F-72017 LE MANS,FRANCE PHASE-DIAGRAM; FILMS A calculation is presented for the component magnetizations of an infinite multilayer Ising system, consisting periodically of two layers of spin-1/2 A ions, two layers of spin-1/2 B ions, and a disordered layer interface in between that is characterized by a random arrangement of A and B ions like a two-dimensional A(p)B1-p alloy. The system is a simple cubic Ising-type structure with a coordination number z = 6. The model is general for ferro- and for antiferromagnetic A-B exchange couplings. The A-A and B-B exchange couplings are regarded as ferromagnetic. An effective field theory that goes beyond mean field, is employed to calculate the bulk-like transition temperature, the different component magnetizations as well as the total bulk-like magnetization. The component magnetizations are calculated for different realistic model values of ferro- and antiferromagnetic A-B exchange constants, as a function of temperature and of the concentration parameter p that characterizes the disorder in the interface. We show that the presence of a disordered interface may significantly affect the component and total magnetizations. In particular, for the case of antiferromagnetic exchange couplings, it is shown that the system can acquire a compensation temperature for certain domains of values of the concentration parameter p in the disordered interface. 7 10 FEB MZ821 J MAGN MAGN MATER

Record 47 of 155 HUBERT S; SIMONI E; LOUIS M; ZHANG WP; GESLAND JY OPTICAL-SPECTRA OF U3+ AND U4+ IN LIYF4 CRYSTALS JOURNAL OF LUMINESCENCE 1994, Vol 60-1, pp 245-249 HUBERT S, INST PHYS NUCL LYON,CNRS,F-91406 ORSAY,FRANCE UNIV MAINE,F-72017 LE MANS,FRANCE Optical studies on single crystals of U:LiYF4 grown by the Czochralski method are carried out. Absorption spectra in UV, visible and IR performed at room and low temperature are characteristic of tetravalent uranium. Under reducing conditions, single crystals of U:LiYF4 are brown and the absorption spectra exhibit a strong large band around 500 nm typical of the f-d transitions of U3+ (5f3 configuration) while the bands in the IR between 2000 and 2400 nm correspond to the absorption of the I-4(11/2) state. From the analysis of the IR emission spectra between 1900 and 3000 nm at 300 and 10 K, the level scheme of I-4(9/2) and I-4(11/2) has been deduced. 6 5 APR NR361 J LUMINESC

Record 49 of 155 BOUCHET A CIRCLE GRAPH OBSTRUCTIONS JOURNAL OF COMBINATORIAL THEORY SERIES B 1994, Vol 60, Iss 1, pp 107-144 BOUCHET A, UNIV MAINE,DEPT MATH & INFORMAT,F-72017 LE MANS,FRANCE ISOTROPIC SYSTEMS; MATROIDS 6 38 JAN MT834 J COMB THEOR B

Record 50 of 155 BORDALLO HN; BULOU A; ALMAIRAC R; NOUET J ANOMALIES IN THE RAMAN-SCATTERING SPECTRA OF PIEZOELECTRIC BAZNF4 CRYSTALS JOURNAL OF PHYSICS-CONDENSED MATTER 1994, Vol 6, Iss 47, pp 10365-10376 BORDALLO HN, UNIV MONTPELLIER 2,CNRS,URA 233,DYNAM PHASES CONDENSEES GRP,F-34095 MONTPELLIER,FRANCE UNIV MAINE,PHYS ETAT CONDENSE LAB,CNRS,URA 807,F-72017 LE MANS,FRANCE INCOMMENSURATE BAMNF4 A Raman scattering investigation of the piezoelectric compound BaZnF4 has been performed in a wide temperature range. An accurate study of the characteristics, i.e. peak shifts, integrated intensities and half-widths, reveals anomalous changes in several spectral lines. The results are discussed on the basis of a breakdown of the q = 0 selection rules due to either a phase transition or structural disorder. 5 12 NOV 21 PU246 J PHYS-CONDENS MATTER

Record 51 of 155 DECHAMPCHESNEL JBF; TASSIN JF; BOWER DI; WARD IM; LORENTZ G THE INFLUENCE OF INITIAL MORPHOLOGY OF ONE-WAY DRAWN POLY(ETHYLENE-TEREPHTHALATE) FILMS ON THEIR TRANSVERSE DRAWING POLYMER 1994, Vol 35, Iss 19, pp 4092-4102 UNIV LEEDS,IRC POLYMER SCI & TECHNOL,LEEDS LS2 9JT,W YORKSHIRE,ENGLAND UNIV MAINE,PHYSICOCHIM MACROMOLEC LAB,CNRS,URA 509,F-72017 LE MANS,FRANCE RHONE POULENC FILMS,MAGPHANE INT,F-01701 MIRABEL,FRANCE POLY(ETHYLENE TEREPHTHALATE); DRAWN FILMS; MORPHOLOGY POLY(ETHYLENE-TEREPHTHALATE) FILMS; MOLECULAR-ORIENTATION; CONSTANT LOAD; PET FILMS; DEFORMATION A study of the development of molecular orientation and crystalline structure during the transverse drawing of one-way drawn poly(ethylene terephthalate) films has been carried out. The influence of the size of the crystallites in the one-way drawn film and the influence of the transverse drawing temperature have been studied. It is shown that the deformation mechanisms appear to depend on the size of the crystals initially present. Films containing small crystals lead to a higher orientation and larger crystalline structures oriented along the transverse direction. The influence of the second drawing temperature can be understood as a result of the importance of molecular relaxation and crystallization, both of which are enhanced by elevated temperatures. 5 11 PH461 POLYMER

Record 52 of 155 MEICHENIN D; AUZEL F; HUBERT S; SIMONI E; LOUIS M; GESLAND JY NEW ROOM-TEMPERATURE CW LASER AT 2.82-MU-M - U-3+/LIYF4 ELECTRONICS LETTERS 1994, Vol 30, Iss 16, pp 1309-1311 MEICHENIN D, FRANCE TELECOM,CNET,LAB BAGNEUX,BP 107,F-92225 BAGNEUX,FRANCE IPN,RADIOCHIM GRP,F-91406 ORSAY,FRANCE UNIV MAINE,CRISTALLOGENESE LAB,F-72017 LE MANS,FRANCE SOLID LASERS; LITHIUM COMPOUNDS The authors report the first observation of CW laser emission of U3+ in LiYF4 at room temperature at 2.82mum. 5 3 AUG 4 PC862 ELECTRON LETT

Record 53 of 155 LEONARDSTIBBE E; LECAYON G; DENIAU G; VIEL P; DEFRANCESCHI M; LEGEAY G; DELHALLE J THE CATIONIC POLYMERIZATION OF N-VINYL-2-PYRROLIDONE INITIATED ELECTROCHEMICALLY BY ANODIC POLARIZATION ON A PT SURFACE JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 1994, Vol 32, Iss 8, pp 1551-1555 LEONARDSTIBBE E, CEA,DSM,DRECAM,SRSIM,F-91191 GIF SUR YVETTE,FRANCE FAC UNIV NOTRE DAME DE LA PAIX,CHIM THEOR APPL LAB,B-5000 NAMUR,BELGIUM INST RECH APPL POLYMERES,F-72000 LE MANS,FRANCE POLY(VINYL PYRROLIDONE); CATIONIC POLYMERIZATION; ELECTROPOLYMERIZATION; THIN FILMS; SURFACE MODIFICATION CATHODE The electroinitiated polymerization of N-vinyl-2-pyrrolidone has been investigated. After electrolysis at controlled potential, a thin, covering, and homogeneous film of poly (N-vinyl-2-pyrrolidone) appears on the electrode. The insolubility of the polymer in its classical solvents implies the existence of a true chemical grafting of macromolecules on the platinum surface. Chain propagation occurs by a cationic mechanism initiated by a direct electron transfer leading to grafted cations on the surface, followed by the nucleophilic attack of neutral molecules. The molecular weight of the polymer was estimated by gel permeation chromatography after having mechanically removed the film from the electrode. A molecular weight distribution curve showing an average value of 16,000 was observed. (C) 1994 John Wiley & Sons, Inc. 5 5 JUN NM080 J POLYM SCI A-POLYM CHEM

Record 54 of 155 DEROUET D; RADHAKRISHNAN N; BROSSE JC; BOCCACCIO G PHOSPHORUS MODIFICATION OF EPOXIDIZED LIQUID NATURAL-RUBBER TO IMPROVE FLAME RESISTANCE OF VULCANIZED RUBBERS JOURNAL OF APPLIED POLYMER SCIENCE 1994, Vol 52, Iss 9, pp 1309-1316 DEROUET D, UNIV MAINE,CHIM & PHYSICOCHIM MACROMOLEC LAB,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE INST RECH APPL POLYMERES,F-72000 LE MANS,FRANCE The use of phosphorus for improving flame retardancy of natural rubber vulcanizates was attempted by incorporating a modified form of natural rubber. By reacting epoxidized liquid natural rubber (ELNR) with dibutylphosphate it was possible to chemically modify the polymer. On a 25% epoxidized LNR, 5.2-6.8% w/w of phosphorus could be fixed on the polymer backbone. The reaction carried out in bulk and solution resulted in products with different T(g) values probably due to the varying crosslink levels in the resultant products. Chemical analysis of the modified polymers prepared by two sets of reactions under identical conditions proved the reproducibility of the reactions in bulk and in solution. Incorporation of the phosphorus-modified ELNR in a natural rubber formulation decreased the flammability behaviors of the vulcanizate. On the other hand, a decrease of the rate of curing and mechanical properties was observed. The phosphorus addition could also be carried out by mixing ELNR and dibutylphosphate at the time of mixing the compounds and resulted in equally good flame retardance with relatively better processing and mechanical properties. (C) 1994 John Wiley & Sons, Inc. 5 8 MAY 31 NL653 J APPL POLYM SCI

Record 55 of 155 BONNANSPLAISANCE C; LEVESQUE G; MIDRAK A POLYMERIZATION OF METHYLTHIIRANE WITH QUATERNARY AMMONIUM-SALTS OF (DI)THIO ACIDS - KINETIC-STUDY IN THF EUROPEAN POLYMER JOURNAL 1994, Vol 30, Iss 2, pp 239-244 BONNANSPLAISANCE C, UNIV MAINE,SYNTH POLYMERES FONCT LAB,CNRS,URA 509,AVE O MESSIAEN,F-72017 LE MANS,FRANCE ISMRA UNIV,POLYMERES & INTERFACES LAB,CNRS,URA 480,F-14050 CAEN,FRANCE POLYMERS The kinetic study of the methylthiirane polymerization in THF initiated by quaternary ammonium (di)thiobenzoate is reported. The effects of different factors have been studied: temperature, nucleophilicity and concentration of the initiator. The propagation and initiation steps have been characterized, and a kinetic study of the initiation step is also reported. We have postulated a two-steps initiation reaction, beginning with a regioselective SN2 reaction of the (di)thiobenzoate on the episulfure followed by the reaction of the thiolate on the (thio)carbonyl. 5 6 FEB MT236 EUR POLYM J

Record 56 of 155 DUJARDIN G; MAUDET M; BROWN E HIGH-YIELD ENDOSELECTIVE HETEROCYCLOADDITIONS INVOLVING BENZYLIDENEPYRUVIC ESTERS AS THE HETERODIENE AND AN ALKOXYSTYRENE AS THE DIENOPHILE TETRAHEDRON LETTERS 1994, Vol 35, Iss 46, pp 8619-8622 DUJARDIN G, FAC SCI LE MANS,CNRS,SYNTH ORGAN LAB,AVE OLIVIER MESSINEN,BP 535,F-72017 LE MANS,FRANCE DIELS-ALDER REACTION; CYCLO-ADDITIONS; DIHYDROPYRANS; ETHERS The benzylidenepyruvic esters 6, 10a-d and 11 smoothly reacted with the alkoxystyrenes 12 and 13 in refluxing hexane or toluene and in the presence of catalytic amounts of Eu(fod)(3), thus selectively lending to the endo adducts 14-21 in high yields. This represents the first examples of an efficient heterocycloaddition of styrene derivatives without using the high pressure technique. The above adducts are potential intermediates for sugiresinol 7 and related tetrahydropyran neolignans. 4 4 NOV 14 PT047 TETRAHEDRON LETT

Record 57 of 155 VERON A; EMERY J; SPIESSER M DOMAIN-STRUCTURE IN BIPHENYL INCOMMENSURATE PHASE-II OBSERVED BY ELECTRON-PARAMAGNETIC-RESONANCE JOURNAL DE PHYSIQUE I 1994, Vol 4, Iss 11, pp 1705-1723 VERON A, UNIV MAINE,EQUIPE PHYS ETAT CONDENSE,URA 807,BLVD O MESSIAEN,F-72017 LE MANS,FRANCE INST MAT NANTES,PHYS CRISTALLINE LAB,F-44072 NANTES 03,FRANCE BRILLOUIN-SCATTERING; MODULATED STRUCTURE; AMPLITUDE MODES; LINE-SHAPES; RELAXATION; POLYPHENYLS; TEMPERATURE; TRANSITIONS; PRESSURE; SYSTEMS The domain structure in incommensurate phase II of single biphenyl crystal has been observed by investigations of the optically excited states of the Electronic Paramagnetic Resonance (E.P.R.) deuterated naphthalene molecular probes which substitute biphenyl molecules. Our results confirm that this phase is a 1q bi-domain one. The analysis of the spectra obtained in X band (9.5 GHz) experiments, in relation with the spin Hamiltonian parameter properties permits us to show that the E.P.R. probe rotates around a direction perpendicular to its long axis while the biphenyl molecule undergoes a twist movement around this axis. They also account for a regime which is like a << multi-soliton >> regime while the modulation is a plane wave one in the pure single crystal. The two molecules of the high temperature cell do not exactly experience the same displacement field in the incommensurate phase and consequently the two domains can be distinguished. The spin Hamiltonian parameters which characterize the E.P.R. probes have been determined in the incommensurate phase II of biphenyl. 4 19 NOV PP724 J PHYS I

Record 58 of 155 MEDARDE M; GARCIAMUNOZ JL; ROSENKRANZ S; GRANADOS X; FONTCUBERTA J; LACORRE P CRYSTALLOGRAPHIC AND MAGNETIC STUDY OF ND0.7LA0.3NIO3 PHYSICA B 1994, Vol 194, pp 367-368 MEDARDE M, ETHZ,NEUTRON SCATTERING LAB,CH-5232 VILLIGEN,SWITZERLAND CSIC,INST CIENCIA MAT BARCELONA,E-08193 BARCELONA,SPAIN UNIV MAINE,FLUORURES LAB,F-72017 LE MANS,FRANCE METAL-INSULATOR-TRANSITION The stability of both the crystallographic and magnetic structures of NdNiO3 is investigated on the solid solution Nd0.7La0.3NiO3. Neutron diffraction and mu+ SR techniques have been used to characterized the changes at the mental-insulator transition. At variance with previous resistance measurements no signal of a possible reentrant metallic behavior is found. 4 2 FEB 1 NB789 PHYSICA B

Record 59 of 155 MERCIER N; LEBLANC M SYNTHESIS, CHARACTERIZATION AND CRYSTAL-STRUCTURE OF A NEW COPPER FLUOROCARBONATE KCU(CO3)F EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 5, pp 423-430 UNIV MAINE,FAC SCI,FLUORURES LAB,UA 449,F-72017 LE MANS,FRANCE GROWTH Structural, magnetic and chemical characterization of a new copper fluorocarbonate KCu(CO3)F is presented. KCu(CO3)F, obtained by hydrothermal growth (T = 740 degrees C, P = 220MPa, t = 24h) is orthorhombic, Pmc2(1), Z = 2, a = 3.972(1)Angstrom, b = 5.038(2)Angstrom, c = 9.005(5)Angstrom. The structure was solved by single crystal X-ray diffraction (MoK alpha lambda = 0.7109 Angstrom, R = 0.021, R(W) = 0.021, 791 unique reflections). The 3D network is built up from CuO3F2 polyhedra linked by the fluorine atoms which form infinite chains along a. These chains are connected by the carbonate groups and the potassium ions which lie in (100) planes. An original magnetic behaviour of KCu(CO3)F, which could not be yet explained, is observed. 4 8 PG483 EUR J SOLID STATE INORG CHEM

Record 60 of 155 MONTEMBAULT V; FOLLIOT V; SOUTIF JC; BROSSE JC SYNTHESIS OF CHELATING MOLECULES AS AGENTS FOR MAGNETIC-RESONANCE-IMAGING .2. SYNTHESIS AND COMPLEXING PROPERTIES OF N-ACRYLOYL DIETHYL IMINODIACETATE COPOLYMERS REACTIVE POLYMERS 1994, Vol 22, Iss 1, pp 81-89 MONTEMBAULT V, UNIV MAINE,FAC SCI,CHIM & PHYSICOCHIM MACROMOLEC LAB,CNRS,URA 509,AVE O MESSIAEN,F-72017 LE MANS,FRANCE REACTIVITY RATIOS; ACRYLAMIDE; ACRYLIC ACID; EUROPIUM COMPLEXATION; N-ACRYLOYL DIETHYL IMINODIACETATE The synthesis of a monomer with diethyl iminodiacetate groups was investigated in order to obtain complexing copolymers. Copolymers of N-acryloyl diethyl iminodiacetate with acrylamide and acrylic acid were synthetized by a radical mechanism using 2,2'-azobisisobutyronitrile (AIBN) as initiator in dioxane at 80-degrees-C. The compositions of the copolymers were established by H-1 nuclear magnetic resonance (NMR) spectroscopy. The reactivity ratios were determined by both Fineman-Ross and Kelen-Tudos methods. The chelating ability of the synthetized copolymers was investigated with Eu-152. 4 9 FEB NB974 REACT POLYM

Record 61 of 155 LOISEAU T; CALAGE Y; LACORRE P; FEREY G NH4FEPO4F - STRUCTURAL STUDY AND MAGNETIC-PROPERTIES JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 111, Iss 2, pp 390-396 UNIV MAINE,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE UNIV MAINE,FAC SCI,EQUIPE PHYS ETAT CONDENSE,CNRS,URA 807,F-72017 LE MANS,FRANCE OXYFLUORINATED MICROPOROUS COMPOUNDS; POWDER NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; MOSSBAUER; GALLOPHOSPHATE; FE2NA3(PO4)3 Hitherto unknown NH4FePO4F has been isolated by low-temperature hydrothermal synthesis. It is orthorhombic and acentric (space group Pna2(1) (No. 33); a = 12.993(3) angstrom, b = 6.468(1) angstrom, c = 10.640(3) angstrom, V = 894.2(6) angstrom3, Z = 8). This compound belongs to the KTiOPO4 (KTP) structure type, with a strict O-F ordering, the Ti-O short bond in KTP being replaced by a Fe-F bonding. The two iron sites, clearly evidenced by Mossbauer spectroscopy, correspond to two different local situations with 2 F- in cis position for Fe(1) and in trans position for Fe(2). With such a configuration, the main magnetic coupling probably occurs within the chains of octahedra via Fe-F-Fe superexchange interactions only, like in AFeF5 and A2FeF5 compounds in which the Neel temperature is close to 10 K. However, the high magnetic transition temperature of NH4FePO4F(45(1)K) shows that the influence of super-superexchange coupling is rather important in this compound. (C) 1994 Academic Press, Inc. 4 7 AUG PC615 J SOLID STATE CHEM

Record 62 of 155 HIRSCHBERG A; GILBERT J; WIJNANDS APJ; VALKERING AMC MUSICAL AEROACOUSTICS OF THE CLARINET JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 559-568 HIRSCHBERG A, EINDHOVEN UNIV TECHNOL,VAKGRP TRANSPORTFYS,POB 513,5600 MB EINDHOVEN,NETHERLANDS UNIV MAINE,LAUM,CNRS,URA 1101,F-72017 LE MANS,FRANCE HIGH AMPLITUDE; REED CHANNEL; AIR-FLOW; SOUND; INSTRUMENTS; TRANSMISSION; NOISE; PIPE We present a review of literature on aspects of sound production in a clarinet which involve non-linearities of the flow in the instrument. We discuss the flow in the reed channel, the contribution of turbulence to the sound production, the vortex shedding at tone holes and the pipe termination and finally we discuss the non-linear wave deformation in the pipe. Most of these effects can only be described qualitatively on the basis of existing theories and the experimental data are insufficient. Further research is welcome. 4 10 MAY 1 NT300 J PHYS IV

Record 63 of 155 MANSRI A; CASALS PF; FAN BT; LAPLUYE G PHOTOADDITION OF STYRENE ON CERTAIN BETA-POLYKETONES BULLETIN DE LA SOCIETE CHIMIQUE DE FRANCE 1994, Vol 131, Iss 3, pp 247-252 UNIV PARIS 07,CNRS,INST TOPOL & DYNAM SYST,URA 34,F-75221 PARIS 05,FRANCE UNIV MAINE,FAC SCI,PHYSICOCHIM & PHOTOCHIM ORGAN LAB,F-72017 LE MANS,FRANCE UNIV TLEMCEN,INST SCI EXACTES,TLEMCEN,ALGERIA UNIV PARIS 07,CHIM PHYS LAB,F-75251 PARIS 05,FRANCE PHOTOADDITION; STYRENE; BETA-POLYKETONES; STEREOSELECTIVITY POLYMERS The irradiation of 1,5-diphenylpentane-1,3,5-trione 1 and 1-phenylhexane-1,3,5-trione 2 at lambda > 290 nm with styrene gives, products of double photo-addition : 1,2,6,9-tetraphenylnonane-1,5,9-trione 5 and 1,2,6-triphenyldecane-1,5,9-trione 6, respectively. Under the same conditions with lambda > 220 nm, 2-(3-oxo-3-phenylpropionyl)indane-1,3-dione 3 and 2-(3-oxobutyryl)indane-1,3-dione 4 give only products of simple photoaddition: 4-(3-oxo-3-phenylpropionyl)-2-phenylbenzocycloheptane-1,5-dione 7 and 4-(3-oxobutyrl)-2-phenylbenzocycloheptane-1,5-dione 8, respectively. The regiospecificity previously observed with the beta-diketones [1] is not a general rule for these beta-triketones. The phenyl group in position 6 (products 5 and 6) is not in the a-position of the benzoyl group. The delta-triketones obtained are characterized using beta-diketonic models, which are prepared by a simple sequence. Observations of products 7 and 8 show that styrene reacts with the cyclic enol only. This work may be considered as a model study for the prediction of the behavior of triketones 1, 2, 3 and 4 in the side chain of polymeric compounds. 4 6 NF806 BULL SOC CHIM FRANCE

Record 64 of 155 BENOIT R; BLANCHI A; ROUBIN C; CHAPEAU MC ONE DIAPHRAGM-LIKE STRICTURE OF THE COLON AND SHORT-TIME PRESCRIPTION OF NONSTEROIDAL ANTIINFLAMMATORY DRUG GASTROENTEROLOGIE CLINIQUE ET BIOLOGIQUE 1994, Vol 18, Iss 5, pp 525-528 BENOIT R, CTR HOSP LE MANS,SERV HEPATOGASTROENTEROL,F-72037 LE MANS,FRANCE HOP MANS,SERV CHIRURG DIGEST,F-72037 LE MANS,FRANCE HOP MANS,SERV ANAT PATHOL,F-72037 LE MANS,FRANCE COLONIC STRICTURES; NONSTEROIDAL ANTIINFLAMMATORY DRUGS; DICLOFENAC INDUCED CONSEQUENCES; LARGE-BOWEL; DISEASE; DICLOFENAC; INTESTINE; HUMANS; NSAIDS A case of diaphragm-like stricture of the colon induced by non steroidal anti-inflammatory drug (diclofenac LP) is reported in a 65-year-old man who presented abdominal pain. Colonoscopy revealed ulcer in the transverse right colon. The patient gradually developed diaphragm-like stricture in the transverse right colon. A right hemicolectomy was performed. 4 4 MAY NV407 GASTROEN CLIN BIOL

Record 65 of 155 CASTAGNEDE B; BROWN N; MELON M MEASUREMENT OF THE REFLECTION COEFFICIENT OF ACOUSTIC MATERIALS IN AIR USING LOW-FREQUENCY ULTRASONICS COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II 1994, Vol 318, Iss 11, pp 1453-1457 CASTAGNEDE B, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,AVE O MESSIAEN,F-72017 LE MANS,FRANCE PROPAGATION; WAVE The Note describes some measurements of reflection coefficient versus incidence angle for acoustic materials immersed in air. This work has been performed using a low frequency (39 kHz) ultrasonic reflecto-refractometer having two independent goniometers. The amplitude measurements were performed on the specular reflection in the Fourier domain with fast algorithms involving the power spectrum. The experimental results are compared with some available theoretical models. An acceptable agreement is observed when the anisotropy of the tortuosity coefficient is taken into account. 4 5 JUN 2 1 NU054 C R ACAD SCI SER II

Record 66 of 155 HAYES P; MAIGNAN C 1ST HETEROCYCLOADDITION OF IN-SITU GENERATED 2-P-TOLYLSULFINYLACROLEIN - SIMPLE SYNTHESIS OF FUNCTIONALIZED DIHYDROPYRAN AND SPIROKETAL DERIVATIVES SYNLETT 1994, Iss 6, pp 409-410 UNIV MAINE,CNRS,SYNTHESE ORGAN LAB,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE DIELS-ALDER REACTIONS 2-p-Tolylsulfinyl acrolein prepared in situ by the oxidation of 2-p-tolylsulfinyl-3-hydroxy-1-propene smoothly reacted with ethyl-vinyl ether, sensitive 2-methylenetetrahydrofuran or 2-methylene tetrahydropyran yielding 1:1 diastereomeric dihydropyrans or dioxaspiroadducts readily separated by flash chromatography. 4 2 JUN NQ811 SYNLETT

Record 67 of 155 BENGUIGUI L; EMERY J; DURAND D; BUSNEL JP ULTRASONIC STUDY OF MILK-CLOTTING LAIT 1994, Vol 74, Iss 3, pp 197-206 BENGUIGUI L, UNIV MAINE,FAC SCI,PHYSICOCHIM MACROMOLEC LAB,URA 509,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE UNIV MAINE,PHYS ETAT CONDENSE LAB,URA 807,F-72017 LE MANS,FRANCE MILK GEL; ULTRASONIC WAVE; PHYSICAL GEL; RENNET MILK GEL; ACID MILK GEL; CASEIN MICELLE RHEOLOGICAL PROPERTIES; GELS; CURD The aim of this study was to understand the structure-properties relationships of the different physical gels built by milk clotting. The investigation of their clotting mechanisms and an approach of the mechanical properties of gels were realized. Ultrasonic wave propagation, a non-destructive investigation tool, was used as an original and privileged means of investigation for milk clotting study. The work presented in this article shows the possibility to obtain an ultrasonic signal related to the different steps of milk clotting and to some of their key parameters. In addition, two distinct ultrasonic response curves have been obtained for rennet and acid coagulation. From the obtained results, it appears to be possible to use ultrasonic techniques for monitoring milk coagulation, however, more research is needed for their validation as a routine tool. 4 10 NM925 LAIT

Record 68 of 155 MORTIER M; GESLAND JY; ROUSSEAU M EXPERIMENTAL AND THEORETICAL-STUDY OF 2ND-ORDER RAMAN-SCATTERING IN BALIF3 SOLID STATE COMMUNICATIONS 1994, Vol 89, Iss 4, pp 369-371 MORTIER M, UNIV MAINE,EQUIPE PHYS ETAT CONDENSE,CNRS,URA 807,F-72017 LE MANS,FRANCE Second-order Raman scattering is evidenced in the inverted cubic fluoroperovskite BaLiF3. Spectra recorded from 300 to 20 K are interpreted from the thermally weighted two-phonons density-of-states calculated with a rigid ion model. 4 3 JAN MX742 SOLID STATE COMMUN

Record 69 of 155 LALIGANT Y CRYSTAL-STRUCTURE OF THE 1ST PALLADIUM AMMINE MOLYBDATE - PD(NH3)4(MOO4) EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1993, Vol 30, Iss 10, pp 1017-1023 LALIGANT Y, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE O MESSIAEN,F-72017 LE MANS,FRANCE Pd(NH3)4(MoO4) is tetragonal (space group I4(1)/amd, Z = 4) with a = 7.4618(4)angstrom and c = 15.5565(10)angstrom. The structure was refined from single crystal X-ray diffraction data using 231 independent X-ray reflections to R(W) = 0.020 (R = 0.020). The crystal structure of Pd(NH3)4(MoO4) is built up by isolated PdN4 square planes and MoO4 tetrahedra. Hydrogen atoms were located around nitrogen and ensure the three dimensional cohesion of the structure by N-H.....O bonding. 4 7 MN338 EUR J SOLID STATE INORG CHEM

Record 70 of 155 KRUPSKI M; BUZARE JY HYDROSTATIC-PRESSURE ELECTRON-PARAMAGNETIC-RESONANCE STUDIES OF THE PHASE-TRANSITION DISCONTINUITY IN RBCAF3 UP TO 800 MPA JOURNAL OF PHYSICS-CONDENSED MATTER 1994, Vol 6, Iss 44, pp 9429-9435 KRUPSKI M, POLISH ACAD SCI,INST MOLEC PHYS,SMOLUCHOWSKIEGO 17,PL-60179 POZNAN,POLAND UNIV MAINE,EQUIPE PHYS ETAT CONDENSE,CNRS,URA 807,F-72017 LE MANS,FRANCE RIGID SPHERE MODEL; GD3+ CENTERS; TEMPERATURE; CRYSTALS The influence of hydrostatic pressure on the cubic-to-tetragonal phase transition in RbCaF3 is studied by monitoring the EPR spectra of the Gd3+-O2- pairs and Gd3+ centres. The phase transition remains of first order up to 800 MPa and the discontinuity of the order parameter psi at T(c) slightly increases with increasing pressure. Similarly, the nonlinearity of the cubic parameter b4(0)(T), caused by the rotational fluctuations, near T(c) becomes larger under pressure. The pressure shift of the phase transition temperature is determined: dT(c)/dp = (36.5 +/- 0.3) K GPa-1. The values of T(c) as well as dT(c)/dp are interpreted within the rigid-sphere model. 3 7 OCT 31 PQ113 J PHYS-CONDENS MATTER

Record 71 of 155 MOURAD A; CASTAGNEDE B; MOTTAY E GREEN-FUNCTIONS FOR CYLINDRICAL ELASTIC-WAVES IN ALUMINUM - COMPARISON BETWEEN THEORY AND EXPERIMENTS JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 1994, Vol 61, Iss 1, pp 219-220 MOURAD A, UNIV BORDEAUX 1,MECAN PHYS LAB,CNRS,URA 867,F-33405 TALENCE,FRANCE BM IND,F-91029 EVRY,FRANCE UNIV MAINE,ACOUST LAB,CNRS,URA 1101,F-72017 LE MANS,FRANCE FLUID SOLID CONFIGURATION; IMPULSIVE POINT-SOURCE; PLANE BOUNDARY; ACOUSTIC-WAVES; GENERATION 3 2 MAR NE371 J APPL MECH

Record 72 of 155 PONCINEPAILLARD F; ROUGER I; GILLES JP; GRANDCHAMP JP SURFACE MODIFICATION OF HEXATRIACONTANE - A COMPARISON BETWEEN EXPOSURE TO AN ELECTRON-ASSISTED CFN-ASTERISK RADICAL FLUX AND TO A MICROWAVE LOW-PRESSURE CF4 PLASMA JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY 1994, Vol A31, Iss 9, pp 1087-1103 PONCINEPAILLARD F, UNIV MAINE,CHIM & PHYSICOCHIM MACROMOLEC LAB,CNRS,URA 509,F-72017 LE MANS,FRANCE UNIV PARIS 11,INST ELECTR FONDAMENTALE,CNRS,URA 22,F-91405 ORSAY,FRANCE CARBON-DIOXIDE; COLD-PLASMA; POLYMERIZATION; POLYETHYLENE; POLYMERS; FLUORINATION; DISCHARGE; CHEMISTRY; MODEL Surface modification of hexatriacontane in a fluorocarbon plasma environment has been studied. Hexatriacontane, a C36 n-alkane deposited on Al foils, has been chosen as a model molecule to simulate high density polyethylene. In order to get more insight on the relevant mechanisms, the samples were first exposed to a flux of CF(n)* radicals either alone or in synergy with low-energy electrons, and second to CF4 low-pressure microwave plasma. The surface modifications were studied by contact angle measurement, Fourier transmission infrared spectroscopy, and electronic spectroscopy for chemical analysis. The CF(n)* radical exposure induces CF(n) and F chemisorption; electron-assisted exposure to radicals induces the grafting of CF, CF2, and CF3 groups on the CH2 groups of the molecule, and the microwave plasma exposure entails the formation of a large amount of CF and CF2 groups. 3 17 PF365 J MACROMOL SCI PURE APPL CHEM

Record 73 of 155 CALAGE Y; REIFF WM LOW-TEMPERATURE ANTIFERROMAGNETIC BEHAVIOR OF ALPHA-RB2FEF5.H2O AND ALPHA-CS2FEF5.H2O JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 111, Iss 2, pp 294-299 CALAGE Y, UNIV MAINE,FLUORURES LAB,UA 449,ROUTE LAVAL,F-72017 LE MANS,FRANCE NORTHEASTERN UNIV,DEPT CHEM,BOSTON,MA 02115 CRYSTAL-STRUCTURE; MOSSBAUER; CS2FECL5.H2O; RANGE D.C. susceptibility and zero field Mossbauer spectroscopy measurements are used to characterize the low-temperature magnetism of alpha-Rb2FeF5 . H2O and alpha-Cs2FeF5 . H2O. The compounds are rigorously isotypic quasi-1D Heisenberg magnets based on hydrogen bonded chains of -{FeF5H2O}2--pseudo-octahedra with intervening Rb+ and Cs+ cations that enhance the low dimensionality. The 1D antiferromagnetic effects appear comparable, T(chimax)(1D) approximately 5 K, while their 3D ordering temperatures are quite different, T(N)(Rb+) = 4.0 K, T(N)(Cs+) = 2.7 K. The internal hyperfine fields extrapolated to T = 0 K are approximately 51 T suggesting zero point spin reduction (approximately 15%) consistent with 1D behavior. High field d.c. susceptibility measurements for polycrystalline Cs2FeF5 . H2O suggest spin-flop behavior with H(SF) < 1 T. A qualitative comparison of the low-temperature magnetic properties of the F- and Cl- analogues for the series M2FeX5 . H2O (M = NH4+, K+, Rb+, Cs+) is given. (C) 1994 Academic Press, Inc. 3 6 AUG PC615 J SOLID STATE CHEM

Record 74 of 155 BROWN E; MOUDACHIROU M RESOLVING AGENTS .2. SYNTHESES OF ARYLURETHANES OF (S)-LACTIC ACID AND THEIR USE IN THE RESOLUTION OF RACEMIC BASES TETRAHEDRON 1994, Vol 50, Iss 34, pp 10309-10320 BROWN E, UNIV MAINE,CNRS,SYNTH ORGAN LAB,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE Reaction of the arylisocyanates 2a-c with ethyl (S)-(-)-lactate, followed by careful saponification, afforded the corresponding chiral acids (S)-(-)-4a-c. The latter were successfully used for the resolution of various racemic bases belonging to both the ephedrine and alpha-aryl ethylamine series. 3 12 AUG 22 PC677 TETRAHEDRON

Record 75 of 155 SOUTIF JC; KARKAB S; BROSSE JC POLYMERIC CARRIERS OF GLYCEROL DERIVATIVES .10. FIXATION OF 1-NAPHTHYLACETIC ACID ON POLY(METHACRYLIC ACID) MACROMOLECULAR CHEMISTRY AND PHYSICS 1994, Vol 195, Iss 8, pp 2947-2964 UNIV MAINE,CHIM & PHYSICOCHIM MACROMOLEC LAB,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE EPOXY-CARBOXY REACTION; CHEMICAL MODIFICATION; KINETICS; ESTERS; MODELS Glycidyl (2,3-epoxypropyl) esters are convenient reagents for the fixation of carboxylic acid moieties on polymeric support of the polyacid type. This way of synthesis was applied to 1-naphthylacetic acid on poly(methacrylic acid). Esterification of 1-naphthylacetyl chloride by glycidol (2,3-epoxy-1-propanol) and addition of 1-naphthylacetic acid on epichlorohydrin (1-chloro-2,3-epoxypropane) with subsequent reformation of the oxirane ring have been used for the synthesis of the glycidyl ester but the reaction of the potassium salt of the acid with epichlorohydrin leads to a better yield. Addition of 1-naphthylacetic acid on glycidyl acetate was studied in N,N-dimethylformamide (DMF) and acetonitrile. The best results were obtained in DMF. The reaction is of first order with respect to epoxide, but 2nd order applies when the solvent is acetonitrile. The same reaction conditions as for glycidyl acetate were used for the chemical modification of poly(methacrylic acid) with glycidyl 1-naphthylacetate except that methanol was used as the solvent. 3 18 AUG PB010 MACROMOL CHEM PHYSICS

Record 76 of 155 HEMONRIBAUD A; CROSNIERLOPEZ MP; FOURQUET JL; COURBION G ON NEW FLUORIDES WITH THE JARLITE-TYPE STRUCTURE - CRYSTAL-STRUCTURES OF NA2SR7AL6F34, NA2SR6ZNFE6F34 AND BA7GA6(F,OH)32-CENTER-DOT-2H2O JOURNAL OF FLUORINE CHEMISTRY 1994, Vol 68, Iss 2, pp 155-163 FAC SCI LE MANS,FLUORURES LAB,CNRS,URA 449,ROUTE LAVAL,F-72017 LE MANS,FRANCE BA3ALF9; FORM New compounds, Na2Sr7Al6F34, Na2Sr6ZnFe6F34 and Ba7Ga6(F,OH)32.2H2O, have been prepared by hydrothermal synthesis in HF solution and by the chloride flux method. The crystal structures have been resolved by X-ray diffraction. All the phases present structures of the Jarlite type in spite of having a different unit cell for the iron phase. The structures of the two first compounds are characterized by [Na2Al6F34]n14n- or [NaZnFe6F34]n13n-sheets of octahedra connected by Sr or [Sr, Na] polyhedra whereas the hydrated fluoride exhibits [Ga3(F,OH)16]7-isolated octahedra trimers separated by Ba ions and water molecules. Structural correlations are made with other Jarlite type phases and with structures involving 'independent' fluoride ions. 3 9 AUG NZ486 J FLUORINE CHEM

Record 77 of 155 DECAP G; RETOUX R; CALAGE Y PB3AL2F12 - CRYSTAL-STRUCTURE OF A CYCLO-FLUOROALUMINATE RELATED TO BA3AL2F12 ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE 1994, Vol 620, Iss 8, pp 1449-1454 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,UA 449,F-72017 LE MANS,FRANCE UNIV MAINE,FAC SCI,EQUIPE PHYS ETAT CONDENSE,CNRS,UA 807,F-72017 LE MANS,FRANCE LEAD FLUOROALUMINATE; PREPARATION; CRYSTAL STRUCTURE PHASE-TRANSITIONS; FLUORIDES; BEHAVIOR; SYSTEM; 555-K Pb3Al2F12 is a fluorometalate obtained in single-crystal form by hydrothermal synthesis. It crystallizes in the monoclinic system, space group P2(1)/n, with a = 9.435(6) angstrom, b = 9.610(5) angstrom, c = 10.100(9) angstrom, beta = 90.59(5)degrees, V = 915.7(2) angstrom3, Z = 4. The structure was solved from single crystal using 3 044 unique reflections (MoKalpha, lambda = 0.71073 angstrom), R = 0.0463, R(w) = 0.0465. The structure exhibits isolated tetrameric groups of octahedra engaged in a subnetwork of independent fluoride polyhedra and is related to that of Ba3Al2F12. A discussion about the existence and the structure of A3M2F12 compounds is given. 3 6 AUG NY529 Z ANORG ALLG CHEM

Record 78 of 155 BROWN E; CHEVALIER C; HUET F; LEGRUMELEC C; LEZE A; TOUET J DETERMINATION OF THE ENANTIOMERIC EXCESSES OF CHIRAL ACIDS BY F-19 NMR-STUDIES OF THEIR ESTERS DERIVING FROM (R)-(+)-2-(TRIFLUOROMETHYL)BENZHYDROL TETRAHEDRON-ASYMMETRY 1994, Vol 5, Iss 7, pp 1191-1194 BROWN E, FAC SCI LE MANS,SYNTH ORGAN LAB,CNRS,URA 482,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE GRIGNARD-REAGENTS; CARBOXYLIC-ACIDS; PURITY 15 Chiral acids were esterified with optically pure (R)-(+)-2-(trifluoromethyl)benzhydrol (R)-(+)-1, a readily available reagent. With respect to the carboxy group, the stereogenic centre is in the beta position in the case of the acids 5a-10a and 12a-16a, and in the alpha position in the case of the acids 17a-20a. The diastereomeric excesses of the corresponding esters 5b-10b and 12b-20b, respectively, were easily determined by means of F-19 NMR. These d.e. values were in very good agreement with the e.e. values of the corresponding acids when the latter were known compounds. 3 4 JUL NX313 TETRAHEDRON-ASYMMETRY

Record 79 of 155 HUBERT S; SIMONI E; LOUIS M; AUZEL F; MEICHENIN D; GESLAND JY U3+/LIYF4, A PROMISING IR LASER JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C4, pp 393-396 HUBERT S, CNRS,IN2P3,INST PHYS NUCL,F-91406 ORSAY,FRANCE CNET,F-92220 BAGNEUX,FRANCE UNIV MAINE,F-72017 LE MANS,FRANCE Under reducing conditions, single crystal of LiYF4 doped with 762 ppm of U3+ were obtained. Absorption and fluorescence spectra of this system are presented as well as the energy level scheme of the lasing transition. Oscillator strength and laser cross section between Stark levels of the I-4(11/2) --> I-4(9/2) transition are calculated 3 4 APR NT087 J PHYS IV

Record 80 of 155 DEGOULET C; BUSNEL JP; TASSIN JF STUDY OF THE STERIC PARTITION-COEFFICIENT IN SIZE-EXCLUSION CHROMATOGRAPHY BY MONTE-CARLO SIMULATION POLYMER 1994, Vol 35, Iss 9, pp 1957-1962 UNIV MAINE,PHYS CHIM MACROMOLEC LAB,URA 509,BP 535,F-72017 LE MANS,FRANCE SIZE-EXCLUSION CHROMATOGRAPHY; UNIVERSAL CALIBRATION; STERIC PARTITION COEFFICIENT GEL-PERMEATION CHROMATOGRAPHY; UNIVERSAL CALIBRATION; INTRINSIC-VISCOSITY; DETECTOR; PROTEINS; CHAINS; SHAPE Monte Carlo generation of polymer chains allows evaluation of the steric partition coefficient, K, for any pore shape and any chain flexibility. This in turn enables the chromatographic radius of macromolecules, R(c), to be defined as the radius of a sphere with the same K value and allows the ratio R(c)/R(eta) to be studied. R(eta) is defined as the radius of the sphere with the same product [eta]M, where M is the molar mass and [eta] the intrinsic viscosity. R(c) is shown to depend on the pore geometry. For a given pore geometry, R(c)/R(eta) is not strictly independent of the flexibility and the relative thickness of the macromolecule. Experimentally, for flexible polymers, the so-called universal calibration is often found to work well. However, simulations show that the universal calibration is not strictly valid and deviations are expected in particular when the global flexibility of standard and sample are different. 3 6 NK350 POLYMER

Record 81 of 155 BLANK HR; FRANK M; GEIGER M; GRENECHE JM; ISMAIER M; KALTENHAUSER M; KAPP R; KREISCHE W; LEBLANC M; LOSSEN U; ZAPF B SYSTEMATIC INVESTIGATION OF MF3 CRYSTALLINE COMPOUNDS (M = AL, CR, FE, GA, IN, SC, TI, AND V) AND FE1-XMXF3 MIXED SERIES (M = GA, CR, V) ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES 1994, Vol 49, Iss 1-2, pp 361-366 UNIV ERLANGEN NURNBERG,INST PHYS,ERWIN ROMMEL STR 1,D-91058 ERLANGEN,GERMANY UNIV MAINE,FAC SCI,CNRS,URA 807,F-72017 LE MANS,FRANCE UNIV MAINE,FAC SCI,CNRS,URA 449,F-72017 LE MANS,FRANCE The electric field gradient at the fluorine site of several crystalline trifluorides was measure by means of the time differential perturbed angular distribution method. The hyperfine data (nu(Q) and eta) are systematically analyzed by taking into account the structural parameters of the crystals; they are also compared to the results obtained by point charge calculations. 3 6 JAN-FEB MZ087 Z NATURFORSCH SECT A

Record 82 of 155 BAGHDADLI D; TREMBLIN G; DUCHER M THE EFFECTS OF LIGHT QUALITY ON GROWTH, PHOTOSYNTHESIS AND DEVELOPMENT IN CULTIVATED THALLI OF CYSTOSEIRA-BARBATA C-AG F-AURANTIA (KUTZ) GIACCONE (PHAEOPHYCEAE, FUCALES) BOTANICA MARINA 1994, Vol 37, Iss 1, pp 43-50 BAGHDADLI D, UNIV MAINE,FAC SCI,BIOL & PHYSIOL VEGETALES LAB,AV O MESSIAEN,F-72017 LE MANS,FRANCE UNIV CLERMONT FERRAND,BIOTECHNOL & PHYSIOL VEGETALES LAB,F-63038 CLERMONT FERRAND,FRANCE CARBON FIXATION; MARINE-ALGAE; TEMPERATURE Apical segments of Cystoseira barbata f. aurantia were grown in the laboratory under various light conditions: white light (as reference) or broad band isoquantic red light (600-700 nm, peak transmission: 660 nm) or blue light (400-580 nm, peak transmission: 430 nm). Growth of apices was higher under blue light than in other conditions. Morphogenesis of cultivated thalli under white or red light was different from field plants with high growth of primary axis and low level of ramifications. Under blue light, morphogenesis of thalli was similar to those harvested in nature. Net photosynthesis was measured and P vs I curves were established under white light. Maximum net photosynthetic rates and initial slope were higher for thalli cultivated under blue light and lower under white and red light. Pigment composition was similar under blue and white light, but under red light, concentrations of Chl a and fucoxanthin were reduced. Carboxylase capacities were measured in vitro. Under blue light, more than 80% of the total carboxylation capacity was due to ribulose 1-5 biphosphate carboxylase, whereas red light stimulated activity of phosphoenolpyruvate carboxykinase. In the low irradiance conditions, only thalli cultivated under blue light presented morphological and photosynthetic characteristics similar to harvested plants. Light responses of C. barbata are related to its future cultivation and its natural habitat growth strategy. 3 8 JAN MX614 BOT MAR

Record 83 of 155 FOURQUET JL; CALAGE Y; BENTRUP U FEALF5 - SYNTHESIS END CRYSTAL-STRUCTURE JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 108, Iss 1, pp 189-192 FOURQUET JL, UNIV MAINE,FAC SCI MANS,FLUORURES LAB,CNRS,URA 449,AVE O MESSIAEN,F-72017 LE MANS,FRANCE ZENTRUM ANORGAN POLYMERE,O-1199 BERLIN,GERMANY 3 4 JAN MU325 J SOLID STATE CHEM

Record 84 of 155 TOUET J; RUAULT T; BROWN E RESOLVING AGENTS .1. (R)-(-)-2-AMINO-1-BENZYLOXYBUTANE, A NEW BASE FOR THE RESOLUTION OF RACEMIC ACIDS SYNTHETIC COMMUNICATIONS 1994, Vol 24, Iss 3, pp 293-300 FAC SCI LE MANS,SYNTHESE ORGAN LAB,CNRS,URA 482,F-72017 LE MANS,FRANCE Treatment of the readily available (R)-(-) enantiomer of 2-aminobutan-1-ol 1 with sodium hydride followed by benzyl chloride afforded the ($) under bar O-benzyl base (R)-(-)-2. The latter was successfully used for the resolution of racemic alpha-methylsuccinic and alpha-bromosuccinic acids, as well as of the racemic alpha-benzylhemisuccinic esters 8 and 9 respectively. 3 8 MU873 SYN COMMUN Record 85 of 155 FAYET G; BERTOUTLEMERCIER C; GUGENHEIM M; AUFFRAY E; JARDELBOUISSIERE J; LACROIX C; CUILLIERE P; DECORDOZE ML; FEVE JR LEPTOMENINGEAL GLIOMATOSIS - A CLINICOPATHOLOGICAL STUDY OF 2 CASES REVUE NEUROLOGIQUE 1994, Vol 150, Iss 10, pp 700-703 HOP G & R LAENNEC,NEUROL CLIN,F-44035 NANTES 01,FRANCE CHG LE MANS,SERV NEUROL,F-72017 LE MANS,FRANCE HOP LA PITIE SALPETRIERE,LAB R ESCOUROLLE,F-75651 PARIS,FRANCE HOP LAENNEC,SERV NEURORADIOL,NANTES,FRANCE HOP BICETRE,NEUROPATHOL LAB,LE KREMLIN BICETR,FRANCE HOP LAENNEC,SERV ANATOMOPATHOL,NANTES,FRANCE MENINGEAL GLIOMATOSIS Leptomeningeal gliomatosis is a diffuse glial infiltration of the subarachnoid space. It is primary and very rare when primary astrocytoma arises in the leptomeninges from heterotopic neuroglial tissue; it is secondary and more frequently reported when associated with a medullar or cerebral intraparenchymal astrocytoma and secondary involvement of the leptomeninges. Primary and secondary forms are difficult to differenciate before neuropathological examination. The authors report 2 anatomo-clinical cases of leptomeningeal gliomatosis in adults, with clinical courses of 6 months and 40 days respectively. The initial clinical picture was aseptic chronic or subacute meningitis. Cytologic examinations of the cerebrospinal fluid (CSF) showed moderate lymphocytosis, with elevated protein and low glucose levels, without anormal cells. On case 2 CT scan and in case I spinal MRI isolated diffuse meningeal contrast enhancement was present, without intraparenchymal lesion. The neuropathological study revealed a diffuse astrocytoma glial leptomeningeal tumour with a focal involvement of the central nervous system (spinal cord in one case, temporal lobe in the other). In conclusion, an isolated aseptic lymphocytosis, meningitis with meningeal anormal signal may reveal leptomeningeal gliomatosis. Neuropathological examination can distinguish primary fram secondary forms. 2 4 OCT PV755 REV NEUROL Record 86 of 155 DESMONS L; HARDY J A LEAST-SQUARES METHOD FOR EVALUATION OF CHARACTERISTICS OF ACOUSTICAL SOURCES JOURNAL OF SOUND AND VIBRATION 1994, Vol 175, Iss 3, pp 365-376 UNIV MAINE,ACOUST LAB,CNRS,URA 1101,F-72017 LE MANS,FRANCE LOAD METHOD; DUCT A multi-load method to determine source characteristics is presented here. The method is simple: only one microphone is used and no second noise source is needed. It is shown that a larger amount of information gained from the system due to more loads avoids stability problems. The validity of the source parameters obtained by the method is compared with the prediction of insertion loss and of the noise production at the output of a known load. Both theoretical predictions and experimental results are compared: the agreement is good. Further explanations are given regarding stability problems occurring in the so-called four-load method. The method gives better results for relatively complex sources (non-constant impedance) than the four-load method, although consuming more time in measurement because of the extra loads. 2 12 AUG 18 PC879 J SOUND VIB Record 87 of 155 LEBAIL A; MARCOS MD; AMOROS P AB-INITIO CRYSTAL-STRUCTURE DETERMINATION OF VO(H2PO2)2.H2O FROM X-RAY AND NEUTRON POWDER DIFFRACTION DATA - A MONODIMENSIONAL VANADIUM(IV) HYPOPHOSPHITE INORGANIC CHEMISTRY 1994, Vol 33, Iss 12, pp 2607-2613 UNIV VALENCIA,FAC CIENCIES QUIM,DEPT QUIM INORGAN,UIBCM,DR MOLINER 50,E-46100 BURJASSOT,SPAIN UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE EXCHANGE The oxovanadium(IV) bis(hypophosphite) hydrate structure is determined ab initio from X-ray and neutron powder diffraction data and refined by using the Rietveld method. Samples may present quite different cell parameters, according to the synthesis conditions, although they are described using the same space group (C2/c; Z = 4) and basically the same structure. Extreme cell parameters values at 25-degrees-C: a = 12.046(3) angstrom, b = 8.147(1) angstrom, c = 7.548(2) angstrom, beta = 121.83(2)degrees; a = 12.262 (8) angstrom, b = 8.069(2) angstrom, c = 7.702(5) angstrom, beta = 123.34(5)degrees. The structure consists of VO6 octahedra linked throught bis(mu-hypophosphite-O,O') bridges, giving rise to isolated chains running along the [101BAR] direction. The only connection between chains is due to hydrogen bonding involving the coordinated water molecule and one oxygen atom of the H2PO2 group. It is suggested that differences among samples are related to additional uncoordinated water molecules randomly inserted between chains (not located). Thermal, IR spectroscopy, and magnetic studies have been performed. X-ray induced amorphization has been followed by powder diffraction and IR spectroscopy. 2 7 JUN 8 NR656 INORG CHEM Record 88 of 155 PERMER L; FEREY G CRYSTAL-STRUCTURE OF BETA'-FE0.33V2O5 ZEITSCHRIFT FUR KRISTALLOGRAPHIE 1994, Vol 209, Iss 5, pp 413-417 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE MIXED VALENCE Fe0.33V2O5 crystallizes in the monoclinic space group C2/m with a = 15.307(8) angstrom, b = 3.624(2) angstrom, c = 10.123(5) angstrom, beta = 107.30(3)degrees, V = 536.12 angstrom3, and Z = 6. The structure was determined from single crystal X-ray diffraction data and it is related to the beta'-MxV2O5 structure type. There are some indications of partial cationic order between V4+ and V5+ within the three vanadium sites. Fe2+ occupies two crystallographic sites with tetrahedral and 3 + 1 coordination, respectively. 2 5 NQ708 Z KRISTALLOGR Record 89 of 155 LALIGANT Y CRYSTAL-STRUCTURE OF THE HEPTAMOLYBDATE (VI) (PARAMOLYBDATE) (NH3)3[PD(NH3)4]3MO7O24 EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 3, pp 211-222 LALIGANT Y, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE O MESSIAEN,F-72017 LE MANS,FRANCE (NH3)3[Pd(NH3)4]3Mo7O24 is monoclinic (space group P2(1)/c, Z = 4) with a = 10.658(1)angstrom, b = 20.628(2)angstrom, c = 17.551(2)angstrom and beta = 113.038(7)degrees. The structure was refined from single crystal data using 4009 independent X-ray reflections to R1 = 0.0364. The crystal structure of (NH3)3[Pd(NH3)4]3Mo7O24 is built up by isolated PdN4 square planes and [Mo7O24]6- clusters of seven MoO6 octahedra identical with those observed in the heptamolybdates of Na+, K+, NH4+ and [CH6N3]+. 2 12 NQ487 EUR J SOLID STATE INORG CHEM Record 90 of 155 PAPIN R; ROUSSEAU M; DURAND D; NICOLAI T ON THE DIFFICULTY OF ATTRIBUTING A FRACTAL SIGNATURE TO LOW-FREQUENCY RAMAN-SPECTRA OF POLYMERS IN SOLUTION JOURNAL OF RAMAN SPECTROSCOPY 1994, Vol 25, Iss 5, pp 313-315 UNIV MAINE,PHYS ETAT CONDENSE LAB,URA 807,F-72017 LE MANS,FRANCE UNIV MAINE,PHYSICOCHIM MACROMOLEC LAB,URA 509,F-72017 LE MANS,FRANCE SCATTERING; MODES Measurements of the low-frequency Raman spectra (LFRS) (below 100 cm-1) of poly(methyl methacrylates) in solution are reported. The reduced intensity exhibits a power law dependence on the frequency at any concentration and at any conversion rate of the polymerization reaction. Even monomeric liquids such as toluene and methyl methacrylate show such a power law behaviour. The results are compared with recent theories on low-frequency Raman scattering from fractal structures and suggest that a more careful interpretation of LFRS is needed. 2 3 MAY NP984 J RAMAN SPECTROSC Record 91 of 155 DEKOZAK A; MARY Y; GREDIN P; RENAUDIN J; FEREY G; BABEL D THE CRYSTAL-STRUCTURE OF THE BINUCLEAR FLUOROCOMPOUND CS3GA2F9 EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 2, pp 115-122 DEKOZAK A, UNIV PARIS 06,CRISTALLOCHIM SOLIDE LAB,CNRS,URA 1388,TOUR 54,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE UNIV MAINE,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE PHILIPPS UNIV,ZENTRUM MAT WISSENSCH,FACHBEREICH CHEM & WISSENSCHAFTLICHES,D-35043 MARBURG,GERMANY FLUORIDES; IRON(III); CS3FE2F9; COMPLEX The crystal structure of hexagonal Cs3Ga2F9 (a = 10.945 angstrom, c = 14.756 angstrom, rho = 4.61 g.cm-3, Z = 6, space group P6(3)cm) has been determined using 1072 independent single crystal X-ray reflections (R = 0.030, wR = 0.036 ). The structure contains two independent binuclear units Ga2F9 of strongly distorted face-sharing octahedra (d(Ga-Ga) = 2.85 angstrom, average d(Ga-F) = 1.90 angstrom). The two units are in a 1 : 2 proportion and repeat each at c/2 along [001], but they are shifted with respect to each other by about c/6. The structure is compared with that of Cs3Fe2F9 and related compounds. 2 8 NM544 EUR J SOLID STATE INORG CHEM Record 92 of 155 GUERY J; GAO Y; GUERY C; JACOBONI C CRYSTAL-STRUCTURE OF LATH4F19.H2O EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 2, pp 187-196 GUERY J, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE EXCESS REO3-RELATED PHASES; CHEMISTRY Single crystals of LaTh4F19.H2O were prepared by reaction of LaF3 and ThF4 in HCl or HNO3 Solutions under hydrothermal conditions. The crystal structure was solved from single crystal X-Ray diffraction data (R=0.04) in the Cmcm space group: a=23.362(1)angstrom, b=7.3127(6)angstrom, c=8.236(1)angstrom, Z=4. The structure is built up with [ThF9]5- and average [Th0.5La0.5F10]6.5- polyhedra associated in biplanes linked by [ThF7(OH2)]n3n- chains. H2O molecules and La atoms were located after the examination of the results of valence bond calculations. 2 10 NM544 EUR J SOLID STATE INORG CHEM Record 93 of 155 CROSNIERLOPEZ MP; DUROY H; FOURQUET JL CRYSTAL-STRUCTURE OF A NEW ACENTRIC OXIDE FLUORIDE OF V(IV) - BAVOF4 ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE 1994, Vol 620, Iss 2, pp 309-312 CROSNIERLOPEZ MP, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE BARIUM VANADIUM OXIDE FLUORIDE; SYNTHESIS; CRYSTAL STRUCTURE The structure of BaVOF4 has been determined by X-ray diffraction data from a single crystal obtained by hydrothermal synthesis: S.G. Fdd2 (acentric), Z - 16, a = 7.920(1), b = 27.608(2) and c = 7.375(1) angstrom with R = 0.0262 and R(w) = 0.0273 for 1508 independent reflections and 64 parameters. The network is built up from cis-linked VOF5 octahedra forming infinite kinked chains running along the [101] and [101BAR] directions, connected by barium cations. The location of O2- and F- ions is discussed using bond valence calculations. As for BaTiOF4 and some compounds in the series A(II)M(III)F5 (A = Ba, Sr and M = Ga, Al, Mn), the structure can be described in terms of a quasi hexagonal compact planes stacking of Ba+2, O2- and F- ions. 2 4 FEB NA298 Z ANORG ALLG CHEM Record 94 of 155 BREZIN AP; BOUDIN M; MASSINKOROBELNIK P; GAUDRIC A; LEHOANG P ACUTE POSTERIOR MULTIFOCAL PLACOID PIGMENT EPITHELIOPATHY AFTER IMMUNIZATION WITH RECOMBINANT HEPATITIS-B VACCINE INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE 1994, Vol 35, Iss 4, pp 2102-2102 HOP LA PITIE SALPETRIERE,PARIS,FRANCE CTR HOSP LE MANS,LE MANS,FRANCE HOP LARIBOISIERE,F-75475 PARIS 10,FRANCE 2 1 MAR 15 MZ585 INVEST OPHTHALMOL VISUAL SCI Record 95 of 155 TORBI A; GELARD JP EVIDENCE OF PALAEOSTRESSES RECORDED BY MICROFRACTURATION FROM THE HERCYNIAN TO THE PRESENT TIME, IN THE SOUTH-EAST OUJDA MOUNTAINS (EASTERN MESETA, MOROCCO) COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II 1994, Vol 318, Iss 1, pp 131-135 TORBI A, UNIV MAINE,GEOL LAB,ROUTE LAVAL,F-72017 LE MANS,FRANCE PALAEOSTRESSES; MICROFRACTURATION; COMPRESSIVE PLIOQUATERNARY EPISODES The microfracturation analysis of the Hercynian basement and Meso-Cenozoic sedimentary cover in the mountains located in the South-East of Oujda shows seven episodes of successive palaeostresses. The first episodes (1, 2) are two tardi-hercynian compressive stresses. The subsequent episodes are: (3) a probably intra-Oxfordian submeridian compressive stress, a probably Mio-Pliocene N-S extension (4) and E-W extension (5) and lastly (6 and 6') two compressive episodes that affected the Plio-Quaternary. 2 5 JAN 6 2 MY151 C R ACAD SCI SER II Record 96 of 155 BRUNEAU M; BRUNEAU AM DYNAMIC BEHAVIOR OF A THIN FLUID LAYER COUPLED TO A MEMBRANE COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II 1993, Vol 317, Iss 12, pp 1543-1548 BRUNEAU M, UNIV MAINE,CNRS,UA 1101,ACOUST LAB,AVE OLIVIER MESSIAEN,PB 535,F-72017 LE MANS,FRANCE The forced vibrations of membranes (or plates), driven by an external source (here an incident acoustic pressure held), backed by a very thin layer of fluid and a rigid plane wall, and surrounded by a reservoir around its periphery, is considered. The ''exact'' statement of the problem is obtained by taking into account effects of heat conduction, bulk and shear viscosity, impedance of the reservoir, and so on, avoiding the approximations currently in use which do not remain valid for miniaturized transducers, if good results are expected. 2 6 DEC 16 MT629 C R ACAD SCI SER II Record 97 of 155 PENNEC Y; RAFIL O; KHATER A A NOVEL-APPROACH FOR THE CALCULATION OF LOCALIZED VIBRATIONAL SURFACE-STATES ON THE TIP OF AN ISOLATED LINEAR ATOMIC CHAIN EXTENDING FROM THE SURFACE BOUNDARY INTO THE BULK OF 2-DIMENSIONAL SYSTEMS JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA 1993, Vol 64-5, pp 777-782 PENNEC Y, UNIV MAINE,FAC SCI,PHYS MAT LAB,CNRS,URA 807,F-72017 LE MANS,FRANCE CTR ETUD SACLAY,SRSIM,F-91191 GIF SUR YVETTE,FRANCE GANIL,CIRIL,F-14040 CAEN,FRANCE SCATTERING; RESONANCES; PHONONS A two dimensional system consisting of a half-infinite linear chain of A atoms wedged between two quarter-infinite square lattice of B atoms is considered. We present a novel approach for the calculation of the localized vibrational states on the extremity of the chain A at the boundary, as a function of the system force constants. The chain, regarded as an isolated inhomogencity extending from the boundary into the bulk of the system, together with the surface boundary, break the symmetry in two dimensions. The matching method is generalized in two dimensions in order to treat the evanescent vibrational states of this system. 2 6 DEC 12 MQ547 J ELECTRON SPECTROSC RELAT PH Record 98 of 155 REWAJ T; KURIATA J; TYPEK J; BUZARE JY PARAMETRIZATION OF THE VIBRONIC CONTRIBUTIONS TO THE B(4)(0) SPIN-HAMILTONIAN PARAMETERS FOR (8)S(7/2) GROUND-STATE IONS IN FLUOROPEROVSKITES ACTA PHYSICA POLONICA A 1993, Vol 84, Iss 6, pp 1143-1149 REWAJ T, TECH UNIV SZCZECIN,INST PHYS,AL PIASTOW 17,PL-70310 SZCZECIN,POLAND UNIV MAINE,CNRS,URA 807,EQUIPE PHYS ETAT CONDENSE,F-72017 LE MANS,FRANCE MEF2 SINGLE-CRYSTALS; TEMPERATURE-DEPENDENCE; LATTICE INTERACTION; GD3+; EU-2+ Parametrization of phonon induced contributions to the experimentally determined temperature dependence of the b4(0) spin-Hamiltonian parameter for Gd3+ doped RbCaF3, CsCaF3, RbCdF3 and TlCdF3 single crystals is discussed. Three physically different parametrization schemes are considered, i.e. that of Einstein, Debye and Huang. It is found that the model of Huang, which predicts that the phonon induced contributions should be proportional to the Debye-Waller factor, describes best the experimental data. The method allowing determination of the Debye temperature from EPR data is also suggested. 2 7 DEC MT166 ACTA PHYS POL A Record 99 of 155 PERMER L; LALIGANT Y; FEREY G; CALAGE Y CRYSTAL-STRUCTURE, MAGNETIC, AND MOSSBAUER STUDIES OF CU6FE0.9V6O19 - A COMPOUND WITH RELAXATION EFFECT JOURNAL OF SOLID STATE CHEMISTRY 1993, Vol 107, Iss 2, pp 539-546 UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE UNIV MAINE,FAC SCI,EQUIPE PHYS ETAT CONDENSE,CNRS,URA 807,F-72017 LE MANS,FRANCE 2 8 DEC MN162 J SOLID STATE CHEM Record 100 of 155 KERGOMARD J; KHETTABI A; GARCIA A GENERAL FORMULATION OF WAVE-GUIDE JUNCTIONS AT LOW-FREQUENCIES COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II 1994, Vol 319, Iss 8, pp 887-892 KERGOMARD J, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,BP 535,AVE OLIVIER MESSIAEN,F-72017 LE MANS,FRANCE CONSERVATOIRE NATL ARTS & METIERS,ACOUST LAB,F-75141 PARIS 03,FRANCE A general expression for the low frequency impedance matrix for planar modes of N-guides planar modes joined through a cavity is found. The Green function decomposition of the cavity in terms of the eigenmodes highlights the frequency dependence of the impedance. The Bernoulli approximation of the impedance is deduced from the general expression. 1 6 OCT 20 1 PQ133 C R ACAD SCI SER II Record 101 of 155 NZEYIMANA H; JABER W; LANEELLE D; FABIANI B; BEAUFILS H; BABINET F; LEBON P A CASE OF LYMPHOMA REVEALED BY A HEMOLYTIC-UREMIC SYNDROME ANNALES DE MEDECINE INTERNE 1994, Vol 145, Iss 5, pp 381-382 NZEYIMANA H, CTR HOSP LE MANS,SERV NEPHROL DIALYSE,194 AVE RUBILLARD,F-72037 LE MANS,FRANCE GRP HOSP PITIE SALPETRIERE,ANAT PATHOL LAB,F-75651 PARIS 13,FRANCE CTR HOSP LE MANS,HEMATOL LAB,F-72037 LE MANS,FRANCE CTR HOSP LE MANS,ANAT PATHOL LAB,F-72037 LE MANS,FRANCE 1 2 PP652 ANN MED INTERN Record 102 of 155 BENOIST P; LEGEAY G SURFACE-TREATMENT OF A POLYURETHANE USING COLD-PLASMA - FLUORINE FIXATION EUROPEAN POLYMER JOURNAL 1994, Vol 30, Iss 11, pp 1283-1287 BENOIST P, INST RECH APPL POLYMERES,72 AVE OLIVIER MESSIAEN,F-72000 LE MANS,FRANCE Polyurethanes are widely used especially in the biomedical field, but they have some disadvantages as their surface behaviour with environment. So, it seemed interesting to fluorinate the elastomer surface for decreasing the surface energy and thereby improve friction properties. Polymeric radicals are produced on the surface layer of the material as fluorine atoms by a carbon tetrafluoride plasma treatment or by some grafting with acrylic-fluorine containing molecules. 1 5 NOV PP680 EUR POLYM J Record 103 of 155 LARUE JP; GRENECHE JM THE PLIOCENE DETRITIC DEPOSITS OF THE CONTACT AREAS ARMORICAN MASSIF PARISIAN BASIN, BETWEEN LAVAL AND ANGERS - (FRANCE) GEODINAMICA ACTA 1994, Vol 7, Iss 3, pp 158-168 LARUE JP, UNIV MAINE,GEDEC,F-72017 LE MANS,FRANCE UNIV MAINE,URA 807,F-72017 LE MANS,FRANCE PLIOCENE DEPOSITS; ARMORICAN MASSIF-PARISIAN BASIN; SEDIMENTOLOGY; MOSSBAUER SPECTROMETRY; PALEOENVIRONMENT The Pliocene detritic deposits of the contact areas Armorican Massif-Parisian Basin, between Laval and Angers (France). In these contact areas, the Pliocene detritic deposits are not very well-known in spite of numerous geological and geographical studies. Grain size distribution and Mossbauer spectrometry together with Xray analysis of clay samples make possible to distinguish the surincombant deposits from older Eocene sand deposits and quaternary alluvial deposits ; it is also possible to identify two different internal formations. Thus the marine red sands which were left in place during the Pretiglian sea regression on uneven terrain, always appear more weathered than the upper insorted gravels, corresponding to a continental layer of more recent apport. During the Quaternary and Pliocene eras, iron hydroxides are all the more abundant as the material is old and long weathered. 1 11 PP388 GEODIN ACTA Record 104 of 155 GERMOND M DIPRIVAN(R) AND FULL STOMACH ANNALES FRANCAISES D ANESTHESIE ET DE REANIMATION 1994, Vol 13, Iss 4, pp 609-612 GERMOND M, CLIN ST CROIX,28 CHEMIN SOLITUDE,F-72000 LE MANS,FRANCE On the basis of published data and our own experience, the procedure to be followed for general anaesthesia in a patient with a full stomach is that of a rapid sequence induction (induction-intubation) or ''crash-induction''. This technique which consists of the administration of atropine, a hypnotic and suxamethonium together with Sellick's manoeuvre, will provide the best conditions for intubation. In view of the characteristics of propofol (rapid effect, deep depression of pharyngo-laryngeal reflexes) it seems possible to use it as a first choice induction agent in patients who are haemodynamically stable. However, it should be noted, that there is, as yet, no evidence of the superiority of propofol over other induction agents. 1 4 PG111 ANN FR ANESTH REANIM Record 105 of 155 BROWN W; NICOLAI T POLARIZED AND DEPOLARIZED DYNAMIC LIGHT-SCATTERING OF CONCENTRATED POLYSTYRENE SOLUTIONS MACROMOLECULAR SYMPOSIA 1994, Vol 79, pp 139-152 BROWN W, UNIV UPPSALA,DEPT PHYS CHEM,BOX 532,S-75121 UPPSALA,SWEDEN UNIV MAINE,PHYSICOCHIM MACROMOLEC LAB,F-72017 LE MANS,FRANCE PHOTON-CORRELATION SPECTROSCOPY; POLY(CYCLOHEXYL METHACRYLATE); CONCENTRATION FLUCTUATIONS; DENSITY; RELAXATION; TOLUENE; MIXTURES Polarized and depolarized dynamic light scattering have been used to examine the dynamics of concentrated polystyrene solutions in dioctyl phthalate and toluene. Time-temperature superposition of the depolarized intensity correlation functions gave master curves covering more than 10 decades on the time scale. Polarized correlation functions are resolved into relaxational and diffusive components having different temperature dependences. When the relaxation rate of the concentration fluctuations approaches the reorientational relaxation rate, the concentration fluctuations become q-independent i.e. the diffusional relaxation is rate-determined by the backbone mobility. With a small molecule solvent as toluene, however, a part of the concentration fluctuations relaxes faster than the orientational relaxation, i.e., the diffusion occurs in the free volume within the ''frozen'' network. 1 14 MAR NE721 MACROMOL SYMPOSIA Record 106 of 155 GRAND N; GILBERT J; LALOE F INFLUENCE OF NONLINEARITY ON CHARACTERISTICS OF OSCILLATIONS OF WOODWIND INSTRUMENTS JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 585-588 GRAND N, UNIV PARIS 07,ESPCI,LOA,CNRS,URA 1503,10 RUE VAUQUELIN,F-75221 PARIS 05,FRANCE UNIV MAINE,ACOUST LAB,CNRS,URA 1101,F-72017 LE MANS,FRANCE Two simple equations give the minimal modelisation of the acoustical behaviour of woodwind instruments. We discuss the predictions of these equations on the characteristics of the small oscillations, in particular their quasisinusoidal character or finite harmonic content, and domain of existence. We show that, instead of predicting a unique and simple standard behaviour, they introduce a whole series of possible cases (including normal and inverse bifurcations), depending on the characteristics of the non linearity and of the resonator. 1 4 MAY 1 NT300 J PHYS IV Record 107 of 155 KUTOYANTS Y; PILIBOSSIAN P ON MINIMUM L1-NORM ESTIMATE OF THE PARAMETER OF THE ORNSTEIN-UHLENBECK PROCESS STATISTICS & PROBABILITY LETTERS 1994, Vol 20, Iss 2, pp 117-123 KUTOYANTS Y, UNIV MAINE,DEPT MATH,BP 535,F-72017 LE MANS,FRANCE ORNSTEIN-UHLENBECK PROCESS; MINIMUM DISTANCE ESTIMATION; L1-NORM We consider the problem of theta-parameter estimation by observations of the linear process dX(t) = thetaX(t) dt + epsilondW(t), X0 = x0, 0 less-than-or-equal-to t less-than-or-equal-to T, where epsilon is a ''small'' parameter. The asymptotics (epsilon --> 0) of minimum L1-norm estimate [GRAPHICS] is investigated. Here x(t)(theta) = x0 exp(thetat). It is proved that this estimate is consistant and the difference epsilon-1(theta(epsilon)* - theta) converges in probability to a random variable which is (for large T) asymptotically normal. 1 7 MAY 27 PA158 STAT PROBAB LETT Record 108 of 155 GIRAUDET M; TRUSS JK ON DISTINGUISHING QUOTIENTS OF ORDERED PERMUTATION-GROUPS QUARTERLY JOURNAL OF MATHEMATICS 1994, Vol 45, Iss 178, pp 181-209 GIRAUDET M, UA 753,PARIS 7,FRANCE UNIV MAINE,F-72017 LE MANS,FRANCE UNIV LEEDS,LEEDS LS2 9JT,W YORKSHIRE,ENGLAND SMALL INDEX; SUBGROUPS 1 29 JUN NW240 QUART J MATH Record 109 of 155 GIBAUD A; MCMORROW DF; COWLEY RA SINUSOIDAL MODULATION OF A THIN-FILM OF NB ON SAPPHIRE PHYSICA B 1994, Vol 198, Iss 1-3, pp 63-65 GIBAUD A, UNIV OXFORD,CLARENDON LAB,OXFORD,ENGLAND UNIV MAINE,FAC SCI,CNRS,URA 807,F-72017 LE MANS,FRANCE 1 3 APR NR013 PHYSICA B Record 110 of 155 BLASSE G; DIRKSEN GJ; CROSNIERLOPEZ MP; FOURQUET JL THE LUMINESCENCE OF THE NBOF6(3-) AND TAOF6(3-) COMPLEXES IN THE BARIUM OXYFLUORIDES BA3NB2O2F12.2H2O AND BA3TA2O2F12 SOLID STATE COMMUNICATIONS 1994, Vol 90, Iss 9, pp 595-597 BLASSE G, UNIV UTRECHT,DEBYE INST,POSTBOX 80000,3508 TA UTRECHT,NETHERLANDS UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE TRANSITION-METAL COMPLEXES; SPECTROSCOPY The luminescence of Ba3Nb2O2F12.2H2O and Ba3Ta2O2F12 are reported. The emission is due to the Nb-O and Ta-O group in the pentagonal bipyramid NbOF63- and the monocapped trigonal prism TaOF63- in these compounds. The greenish luminescence shows a large Stokes shift and a high efficiency. A comparison with related systems is also presented. 1 3 JUN NM721 SOLID STATE COMMUN Record 111 of 155 MORANTAVICE A; JURVILLIERS P; COUDRET A STOMATAL MOVEMENTS AND GAS EXCHANGES OF A TRITICALE AND ITS PARENTAL SPECIES IN WATER-STRESS CONDITIONS AGRONOMIE 1994, Vol 14, Iss 2, pp 113-120 MORANTAVICE A, UNIV MAINE,PHYSIOL VEGETALE LAB,BP 535,F-72017 LE MANS,FRANCE STOMATA; WATER-USE EFFICIENCY; OSMOTIC STRESS; TRITICALE The triticale T 300 and its parental species (Triticum dicoccum farrum and Secale cereale cv 'Petkus') were subjected to transient and prolonged osmotic stress in order to define their adaptative capacities to arid environments. First, a transient osmotic stress was induced by a rapid replacement of the nutrient solution by another complemented with 86 mM NaCl or 61 mM PEG, the shoot placed in air at 33.5% or 47% relative humidity. Water fluxes then decreased according to the species and stress conditions. Under prolonged water stress in presence of 61 mM PEG in the nutrient medium, Triticum df had a better water-use efficiency than T300 and rye. On the contrary, in the nutrient solution, T300 had a better water-use efficiency than its parental species. Under water stress, water loss was avoided by stomatal closure in rye and Triticum df, whereas in T300 the stomata stayed open and gas exchange were lower than in control plants. 1 8 NH525 AGRONOMIE Record 112 of 155 SANCEAU JY; DHAL R; BROWN E LIGNANS .17. RESEARCH PERTAINING TO THE TOTAL SYNTHESIS OF A NORCYCLONEOLIGNAN, METASEQUIRIN-B TETRAHEDRON 1994, Vol 50, Iss 11, pp 3363-3380 SANCEAU JY, FAC SCI LE MANS,CNRS,URA 482,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE ULLMANN REACTION; PRECURSORS; COLCHICINE The total synthesis of the racemic furano bisbenzocycloheptene 3 is described. The compound 3, which contains five asymmetric centres, is the 5,8-bis-epimer of the tetra-O-methyl derivative of metasequirin-B (1), a norcycloneolignan of unusual structure. 1 18 MAR 14 NB392 TETRAHEDRON Record 113 of 155 ALEXANDRE C; BELKADI O; ROUESSAC F SYNTHESIS AND STRUCTURAL STUDY OF (+)-5-ACETYL-6-METHYL-5P-TOLYLSULFINYL-3A,4,5,6-TETRAHYDRO-(3H)-BENZOFURAN-2-ONE SYNTHETIC COMMUNICATIONS 1994, Vol 24, Iss 4, pp 447-452 ALEXANDRE C, FAC SCI LE MANS,SYNTHESE ORGAN LAB,CNRS,URA 482,AVE O MESSIAEN,BP 535,F-72017 LE MANS,FRANCE an efficient synthesis of the title compound has been developed from 3-phenyl suffonylpropanoic acid via the butenolide 2. The key synthetic step is a Diels-Alder reaction. A mechanism is suggested. 1 6 MZ369 SYN COMMUN Record 114 of 155 CROSNIERLOPEZ MP; DUROY H; FOURQUET JL ABOUT THE CRYSTAL-STRUCTURE OF CUNB(OH,F)(7)CENTER-DOT-3H2O JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 108, Iss 2, pp 398-401 CROSNIERLOPEZ MP, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE O MESSIAEN,F-72017 LE MANS,FRANCE 1 4 FEB MU652 J SOLID STATE CHEM Record 115 of 155 RIGANE A; GOURMELEN C; BROQUET P; TRUILLET R TECTONIC-SEDIMENTARY PHENOMENA ORIGINALITY AT THE TERMINAL YPRESIAN IN CENTRAL-NORTHERN TUNISIA (KAIROUAN AREA) BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE 1994, Vol 165, Iss 1, pp 27-35 RIGANE A, FAC SCI SFAX,DEPT GEOL,3038 SFAX,TUNISIA LAB GEOL STRUCT & APPL,F-25030 BESANCON,FRANCE UNIV MAINE,GEOL LAB,F-72017 LE MANS,FRANCE STRUCTURAL ANALYSIS; YPRESIAN; CENTRAL-NORTHERN TUNISIA; EXTENSIONAL STRIKE-SLIP FAULTS; SYNSEDIMENTARY TECTONICS; SYNDIAGENETIC TECTONICS; HYDROPLASTIC STRUCTURES In central-northern Tunisia, the Ypresian deposits make up a carbonate megasequence which is surrounded by Palaeocene clays at the base and by the Lutetian-Priabonian marls at the top.The structural analysis of the Ypresian limestones in different scales, shows that this period is characterized by synsedimentary movements (extensional strike-slip faults). These movements have produced multiscales fracturing in blocks with the terminal sedimentation. This deformation is accompanied by the appearance of original synsedimentary and syndiagenetic phenomena. They occur in several stages along submarine fault scarps generating breccias and rotational landslides acting upon soft sediments (hydroplastic structures), at a period when one notes rapide variation in the directions of extension (49-50 Ma ago). 1 9 MW702 BULL SOC GEOL FR Record 116 of 155 MIMI ML; PENNEC Y; BASSAT JM; LEBLANC M; GRENECHE JM MAGNETIC-PROPERTIES OF THE IRON-CHROMIUM FLUORIDE MIXED SERIES JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 1994, Vol 129, Iss 2-3, pp 289-301 UNIV MAINE,FAC SCI,EQUIPE PHYS ETAT CONDENSE,CNRS,URA 807,F-72017 LE MANS,FRANCE UNIV MAINE,CHIM FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE CTR RECH PHYS HAUTES TEMP,F-45071 ORLEANS 2,FRANCE SPIN-GLASS BEHAVIOR; FE-MN ALLOYS The mixed fluoride series Fe1-xCrxF3 (0 less than or equal to x less than or equal to 1), synthesized by solid state reaction, crystallizes in space group R (3) over bar c, identical to that of r-FeF3 and r-CrF3. Mossbauer spectroscopy gives clear evidence for six-fold coordinated trivalent high-spin iron ions and magnetic susceptibility for antiferromagnetic interactions. Both Mossbauer and susceptibility measurements have clearly revealed reentrance phenomena and magnetic spin-cluster structures; these properties which result from the presence of short-range spin correlations, are strongly dependent on the chromium content and on the synthesis conditions. By accounting for magnetic studies previously discussed on the Fe1-xGaxF3 series, we can confirm the paramagnetic Curie temperature value theta(p) of r-FeF3 from the literature. In addition, one can conclude in favour of nonnegligible antiferromagnetic interactions between second next nearest neighbours: such a phenomenon agrees well with the presence of magnetic frustration in these compounds, experimentally observed through the values of \theta(p)/T-N\. 1 13 JAN MV013 J MAGN MAGN MATER Record 117 of 155 LAZRAK K; MACHET MC; FOREST JL; MACHET L; LORETTE G; PASQUIOU C DISSEMINATED XANTHOSIDEROHISTIOCYTOSIS, A RARE VARIANT OF XANTHOMA-DISSEMINATUM, IN A PATIENT WITH A PLASMA-CELL DYSCRASIA ANNALES DE DERMATOLOGIE ET DE VENEREOLOGIE 1993, Vol 120, Iss 12, pp 904-906 LAZRAK K, HOP MANS,SERV DERMATOL,LE MANS,FRANCE HOP TROUSSEAU,SERV ANAT PATHOL,TOURS,FRANCE HOP MANS,SERV ANAT PATHOL,LE MANS,FRANCE HOP TROUSSEAU,SERV DERMATOL,TOURS,FRANCE XANTHOMA-DISSEMINATUM; MONOCLONAL GAMMOPATHY; HISTIOCYTOSIS; XANTHOSIDEROHISTIOCYTOSIS; SYSTEMIC INVOLVEMENT; PERICARDIUM; MULTIPLE MYELOMA Xanthosiderohistiocytosis is a rare non-Langerhans histiocytosis (4 reported cases). The clinical characteristics include diffuse, sometimes deep, dark-brown infiltrations of the skin. Histological examination reveals abondant deposits of haemosiderin within the histiocyte proliferation. This entity is a clinical form of Montgomery's disease (xanthoma disseminatum) which has been reported in over 100 cases. Our case of disseminated xanthosiderohistiocytosis was particular because it involved the heart and was associated with a monoclonal gammapathy. Five cases have been reported associating xanthoma disseminatum and monoclonal gammapathy, including one case of xanthosiderohistiocytosis. In our case, rapidly increasing levels of monoclonal immunoglobulin suggested an evolution towards a myeloma. A monoclonal gammapathy should be looked for and monitored in cases of xanthosiderohistiocytosis, and more generally xanthoma disseminatum because of the risk of developing lymphoma or myeloma. 1 3 MR086 ANN DERMATOL VENEREOL Record 118 of 155 BARAULT G; ROHR L; GRENECHE JM MAGNETIC TEXTURE IN SPLAT-COOLED METGLASSES INVESTIGATED BY MOSSBAUER-SPECTROSCOPY JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 1993, Vol 128, Iss 3, pp 258-266 UNIV MAINE,EQUIPE PHYS ETAT CONDENSE,CNRS,URA 807,F-72017 LE MANS,FRANCE UNIV BASEL,INST PHYS,CH-4056 BASEL,SWITZERLAND FE82B12SI6 As-quenched Fe82B12Si6 splat-cooled metglasses were investigated at room temperature by Mossbauer spectroscopy using transmission and reflexion geometry. Their room temperature hyperfine data are very close to those obtained on analogous amorphous ribbons prepared by the melt-spinning technique. The present study gives evidence for a preferentially out-of-plane magnetic anisotropy contrary to that of melt-spinning iron-based metglasses; in addition, a radial evolution of the ferromagnetic domain texture originating from a distribution of thermal stresses induced during the quenching is observed. A schematic model of the solidification process in the case of splat-cooled samples is proposed in agreement with the present Mossbauer experiments. 1 9 DEC MQ148 J MAGN MAGN MATER Record 119 of 155 GAO Y; JACOBONI C PREPARATION OF EUROPIUM-DOPED BARIUM BROMOFLUORIDE THIN-FILMS BY PHYSICAL VAPOR-DEPOSITION MATERIALS RESEARCH BULLETIN 1994, Vol 29, Iss 12, pp 1315-1319 GAO Y, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE EUROPIUM; BARIUM; PHOSPHOR; LUMINESCENT MATERIALS A new vapour phase deposition method of preparation of BaFBr:Eu2+ phosphor films for digital X-ray imaging computed radiography has been developed. The thin films were obtained by coevaporation of EuF2 and of the mixture BaFBr+10%(mole) BaF2. The doping concentration and the film thickness can be respectively controlled by the temperatures of the vessels and the deposition times. The dehydration of BaBr2.2H2O and the synthesis of BaFBr were studied by X-ray thermodiffractometry. No oxihalide formation was detected in these experiments. 0 5 DEC PU640 MATER RES BULL Record 120 of 155 FEREY G; PARMENTIER J THE PYROCHLORE -] HTB -] REO3 SUCCESSIVE PHASE-TRANSITIONS OF FEF3 EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 8-9, pp 697-704 FEREY G, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE O MESSIAEN,F-72017 LE MANS,FRANCE ILL GRENOBLE,F-38042 GRENOBLE 09,FRANCE MAGNETIC-STRUCTURES; CRYSTAL-STRUCTURE; FORM; CHEMISTRY FeF3 exists under one amorphous and three crystalline forms corresponding to the defect pyrochlore (Pyr)., the hexagonal tungsten bronze (HTB) and the ReO3 (R) structure types respectively. The neutron thermodiffractometry study of Pyr-FeF3 shows that it transforms irreversibly first into the HTB and then into the R forms at 315 and 385 degrees C respectively. Some elements of a plausible mechanism for the transformation are proposed. 0 8 PU216 EUR J SOLID STATE INORG CHEM Record 121 of 155 TREMBLIN G; FERARD G GROWTH AND SALT ACCUMULATION OF HALOPEPLIS-AMPLEXICAULIS (VAHL) UNG CULTIVATED UNDER DIFFERENT SALINITY CONDITIONS ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY 1994, Vol 15, Iss 3, pp 355-364 TREMBLIN G, UNIV MAINE,FAC SCI,BIOL & PHYSIOL VEGETALES LAB,AV O MESSIAEN,BP 535,F-72017 LE MANS,FRANCE NACL; ACCUMULATION; OSMOTIC POTENTIAL; HALOPEPLIS-AMPLEXICAULIS HALOPHYTES Growth and roots/shoots ions distribution were studied in an annual inland halophyte: Halopeplis amplexicaulis, with respect to NaCl concentration in solution culture. Growth (dry matter production) of Halopeplis amplexicaulis was optimum when exposed to 200 to 300 mM NaCl. Shoots accumulated high concentrations of Na and Cl, but K and S concentrations decreased with increased salinity but not into roots. Osmotic adjustment was almost entirely function of Na+ and Cl- accumulation in shoots but only 50% in roots where other osmoticum might occur. Ecophysiological characteristics are discussed according to saline inland habitats. 0 10 PQ922 ACTA OECOL Record 122 of 155 BENOIST P; LEGEAY G; PONCINEPAILLARD F POLYURETHANE FLUORINATION WITH A COLD-PLASMA TREATMENT VIDE-SCIENCE TECHNIQUE ET APPLICATIONS 1994, Iss 272, pp 398-401 BENOIST P, IRAP,DEPT MAT,CTR TRANSFERT TECHNOL,RUE THALES MILET,F-72000 LE MANS,FRANCE UNIV MAINE,CHIM & PHYSICOCHIM LAB,CNRS,URA AU N509,F-72000 LE MANS,FRANCE Polyurethanes are widely used especially in the biomedical field, but they present some disadvantages because of their surface behavior with regard to a specific surrounding. So, it seems interesting to fluorinate the elastomer surface in order to decrease its surface energy and thereby to improve friction properties. Modification of polyurethane through fluorinated plasmas treatments - CF4, SF6- leads to the wanted effect. However, a two-steps process - plasma treatment followed by grafting of a fluorinated monomer - is also a good approach of fluorination of polyurethane surface. 0 4 AUG-OCT S PP170 VIDE Record 123 of 155 COMBETTE C; HIVERT D; MAUCOURT J; BRUNAT W; DUC TM; MICHEL G; LEPRINCE P; LEGEAY G COLD-PLASMA TREATMENT OF ELASTOMERIC SILICONE SURFACES VIDE-SCIENCE TECHNIQUE ET APPLICATIONS 1994, Iss 272, pp 416-419 COMBETTE C, CTR ETUD BOUCHET,SOC NATL POUDRES & EXPLOS,F-91710 VERT LE PETIT,FRANCE ETAB SNPE,F-33166 ST MEDARD,FRANCE UNIV LYON 1,CTR ESCA NANOANAL & TECHNOL SURFACE,F-69622 VILLEURBANNE,FRANCE UNIV PARIS 11,PHYS GAZ & PLASMAS LAB,F-91405 ORSAY,FRANCE CTR TRANSFERT TECHNOL MANS,DEPT MAT,INST RECH APPL POLYMERES,F-72000 LE MANS,FRANCE Elastomeric silicones reinforced by fillers and fibers are interesting materials as internal thermal protection in modern solid propellant rockets However, an adhesion primer is needed because of their poor bond strength to case and propellant. It is shown in this study that microwave or radiofrequency plasma treatment with gas rich in oxygen, create strong interfaces by oxydation reactions, and give cohesive failure at high level in silicone elastomer and propellant. Such a technique could replace chemical treatment to promote adhesion 0 4 AUG-OCT S PP170 VIDE Record 124 of 155 BREZINI A; SEBBANI M; DEPOLLIER C LOCALIZATION PROPERTIES OF 1D DISORDERED-SYSTEMS IN THE PRESENCE OF AN ELECTRIC-FIELD PHYSICA STATUS SOLIDI B-BASIC RESEARCH 1994, Vol 185, Iss 2, pp 359-366 BREZINI A, INT CTR THEORET PHYS,POB 586,I-34100 TRIESTE,ITALY UNIV ORAN ES SENIA,INST PHYS,PHYS ELECTR SOLIDE LAB,ORAN,ALGERIA UNIV MAINE,ACOUST LAB,F-72017 LE MANS,FRANCE METAL-INSULATOR-TRANSITION; CONDUCTANCE; RESISTANCE; LAW A Kronig-Penney model with a constant electric field is used to examine the transmission properties of electrons in one-dimensional disordered systems. Disorder is introduced into the system by assuming that the strengths of the delta-function potential are random variables uniformly distributed. In particular the cases where the strength varies from O to W (barriers) and from - W to O (wells) are considered. Extensive results are presented and compared to other theories. 0 8 OCT PP412 PHYS STATUS SOLIDI B-BASIC RE Record 125 of 155 HEMONRIBAUD A; GRENECHE JM; COURBION G SYNTHESIS, CRYSTAL-STRUCTURE, AND MAGNETIC STUDY OF NA7SR2FE7F32 JOURNAL OF SOLID STATE CHEMISTRY 1994, Vol 112, Iss 1, pp 82-91 HEMONRIBAUD A, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,F-72017 LE MANS,FRANCE UNIV MAINE,FAC SCI,CNRS,URA 807,F-72017 LE MANS,FRANCE X-RAY; WEBERITE; DIFFRACTION; NA2CUFEF7; BEHAVIOR; VARIANT; NEUTRON Na7Sr2Fe7F32 is orthorhombic (space group Fddd) with a 10.372(3) Angstrom, b = 10.805(3) Angstrom, c 44.98(2) Angstrom, and Z = 8. The structure was determined from single-crystal data using 1261 independent X-ray reflections, with reliability R = 0.036 (R(w) = 0.029). Corner-sharing iron octahedra give rise to a three-dimensional network [Fe7F32](11-)(n), where linear trans connected [FeF5](2n-)(n) chains and [Fe5F26](11)- octahedra pentamers can be distinguished. Na7Sr2Fe7F32 clearly exhibits an atypic magnetic behavior evidenced from Mossbauer and magnetic measurements (T-c approximate to 35 K). A competition between ferromagnetic and antiferromagnetic couplings is suggested in relation to a frustrated octahedra network. (C) 1994 Academic Press, Inc. 0 10 SEP PG305 J SOLID STATE CHEM Record 126 of 155 LALIGANT Y; LALIGANT A CHLORO COMPLEX OF PALLADIUM WITH 1,4-DIAZABICYCLO [2.2.2] OCTANE - CRYSTAL-STRUCTURE OF (C6N2H14)[PDCL4] EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 5, pp 401-408 LALIGANT Y, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE O MESSIAEN,F-72017 LE MANS,FRANCE UNIV LAVAL,FAC SCI AGR & ALIMENTAT,CTR STELA,DEPT SCI & TECHNOL ALIMENTS,QUEBEC CITY G1K 7P4,PQ,CANADA AMINO-ACIDS; METHIONINE (C6N2H14)[PdCl4] is triclinic (space group P ($) over bar 1, Z = 2) with a = 6.726(2)Angstrom, b = 6.915(2)Angstrom, c = 13.494(4)Angstrom, alpha = 78.38(2)degrees, beta = 83.09(2)degrees and gamma = 71.79(2)degrees. The structure was refined from single crystal data using 2536 independent X-ray reflections to R = 0.022 (Rw = 0.024). The crystal structure of (C6N2H14)[PdCl4] is built up from isolated [PdCl4](2-) square planes and (C6N2H14)(2+) cations. 0 8 PG483 EUR J SOLID STATE INORG CHEM

Record 127 of 155 KUTOYANTS Y; POHLMANN H PARAMETER-ESTIMATION FOR KALMAN-BUCY FILTER WITH SMALL NOISE STATISTICS 1994, Vol 25, Iss 4, pp 307-323 UNIV MAINE,DEPT MATH,F-72017 LE MANS,FRANCE UNIV PARIS 06,CNRS,URA 132,F-75252 PARIS,FRANCE TECH UNIV ILMENAU,INST MATH,D-98684 ILMENAU,GERMANY PARAMETER ESTIMATION; PARTIALLY OBSERVED LINEAR SYSTEMS; ASYMPTOTIC EXPANSION The asymptotic behavior of the MLE of a parameter of partially observed linear system is studied. Using asymptotic expansion of this estimate by the powers of diffusion coefficient the consistency and asymptotic normality of MLE are proved. The time of observation is supposed to be fixed and the asymptotics corresponds to small noises in observed and nonobserved equations. 0 17 PG120 STATISTICS

Record 128 of 155 LEGAL G; KHATER A; KANEYOSHI T THE ROLE OF A DISORDERED INTERFACE BETWEEN 2 FERROMAGNETIC ISING SYSTEMS IN A TRANSVERSE FIELD PHYSICA A 1994, Vol 209, Iss 1-2, pp 129-139 LEGAL G, UNIV MAINE,PHYS MAT LAB,F-72017 LE MANS,FRANCE NAGOYA UNIV,DEPT NAT SCI INFORMAT,NAGOYA 46401,JAPAN SURFACE MAGNETISM; PHASE-DIAGRAM; MODEL; TEMPERATURE The phase diagrams of a disordered interface consisting of two mixed layers between two semi-infinite spin-1/2 Ising ferromagnets (A and B) in a transverse field are investigated by the use of the effective-field theory. We have obtained some interesting results. (i) For zero transverse field, the increase of thickness in the interface with alloying disorder A(p) - B1-p does not change the possibility of interface magnetism. (ii) In a finite transverse field, the critical exchange interaction at which the interface magnetism can appear may be affected severely, especially for the systems with pure (p = 0 and p = 1) interfaces, although the critical value of the disordered interface with 0.3 less-than-or-equal-to p less-than-or-equal-to 0.9 does not deviate so much from that of zero transverse field. (iii) The possibility of observing the interface magnetism experimentally is also proposed, applying a large transverse field. 0 11 AUG 15 PC414 PHYSICA A

Record 129 of 155 KUTOYANTS Y; PILIBOSSIAN P ON MINIMUM UNIFORM METRIC ESTIMATE OF PARAMETERS OF DIFFUSION-TYPE PROCESSES STOCHASTIC PROCESSES AND THEIR APPLICATIONS 1994, Vol 51, Iss 2, pp 259-267 KUTOYANTS Y, UNIV MAINE,DEPT MATH,BP 535,F-72017 LE MANS,FRANCE UNIV PARIS 06,CNRS,URA 1321,F-75252 PARIS 05,FRANCE UNIV PARIS 06,UFR 920 MATH,CNRS,URA 1321,F-75252 PARIS 05,FRANCE PARAMETER ESTIMATION; DIFFUSION-TYPE PROCESS; DIFFUSION COEFFICIENT; LIMIT DISTRIBUTION The problem of finite-dimensional parameter estimation for a diffusion-type process is considered. The proposed minimum distance estimate is introduced as a point where the supremum norm of the difference between the observations and the corresponding deterministic (limit) solution attains its minimum. Under some regularity conditions the consistency of this estimate is established as the diffusion coefficient tends to zero and the limit distribution is described. 0 9 JUL PD390 STOCH PROC APPL

Record 130 of 155 MEYNIAL X; GRILLON V; POLACK JD; DODD G AURALIZATION IN SCALE MODELS - PROCESSING OF IMPULSE RESPONSES JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 135-138 MEYNIAL X, UNIV MAINE,FAC SCI,ACOUST LAB,URA 1011,AVE OLIVIER MESSIAEN,BP 525,F-72000 LE MANS,FRANCE UNIV AUCKLAND,SCH ARCHITECTURE,ACOUST RES CTR,AUCKLAND 92019,NEW ZEALAND TECH UNIV DENMARK,ACOUST LAB,DK-2800 LYNGBY,DENMARK Acoustical measurements using scale models offer a time and cost efficient method for determining the acoustical properties of enclosures. In order to listen in to the models, measured impulse responses have to be compensated for excessive air attenuation in the model, equalized for the transducers response, and their dynamic range has to be extended. The present paper describes corresponding processing, restricted to monaural signals. 0 4 MAY 1 NT300 J PHYS IV

Record 131 of 155 ALLARD JF RECENT MODELS FOR ACOUSTIC-WAVE PROPAGATION IN POROUS MATERIALS JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 177-182 ALLARD JF, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE The modelling of the interactions between porous structures and saturating fluids has known new developments. D.L Johnson has given a rigorous definition of tortuosity and has introduced a new parameter, the viscous characteristic dimension. A thermal characterictic dimension can be defined in a similar way. For the case of elastic structures, the two compressional waves must be taken into account. A matrix formulation is presented, which simplifies the modelling of stratified porous materials having an elastic structure. 0 6 MAY 1 NT300 J PHYS IV

Record 132 of 155 CASTAGNEDE B; DEPOLLIER C NUMERICAL RESULTS AND BIOT THEORY IN ANISOTROPIC POROUS FIBROUS MEDIA JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 183-186 CASTAGNEDE B, UNIV MAINE,ACOUST LAB,URA 1101,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE 0 4 MAY 1 NT300 J PHYS IV

Record 133 of 155 HAMERY P; BRUNEAU M; BRUNEAU AM MOVEMENT OF A FILM OF DISSIPATIVE FLUID IN AN ENCLOSED AREA UNDER THE INFLUENCE OF AN EXTENDED SOURCES JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 213-216 HAMERY P, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE In recent years, the growing demand for miniaturized transducers and the widespread use of silicon technology, has focused interest on the design of condenser or electret microphones on a silicon chip. But the theoretical models used are those existing for conventional microphones, which do not remain valid for miniaturized transducers, if good accuracy is expected. The main purpose of the paper is to consider the forced vibrations of the membranes (or plates), driven by an external source (here an incident acoustic pressure field), backed by a very thin layer of fluid and a rigid plane wall, and surrounded by a reservoir around its periphery. The ''exact'' statement of the problem is obtained by taking into account effects of heat conduction, bulk and shear viscosity, impedance of the surrounding cavity, and so on, avoiding the approximations currently in use. An improved analytical solution is obtained and some new features are indicated. 0 4 MAY 1 NT300 J PHYS IV

Record 134 of 155 LOTTON P; BRUNEAU AM; BRUNEAU M; SKVOR Z LOCALIZED-CONSTANTS MODEL OF TRANSDUCERS - DISSIPATION IN BOUNDARY-LAYERS JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 217-220 LOTTON P, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,BP 535,F-72017 LE MANS,FRANCE UNIV TECH PRAGUE,ACOUST LAB,CS-16627 PRAGUE 6,CZECH REPUBLIC The main purpose of the paper is to provide, in an analytic way, an electrical network which describes the behaviour of electrostatic or electret transducers,and which takes into account the effects of the strong coupling between the mechanical and acoustical parts of the system, the conventional model seems to be improved to describe new miniaturized transducers with a good accuracy. 0 4 MAY 1 NT300 J PHYS IV

Record 135 of 155 BEQUIN P; HERZOG P ACOUSTIC SOURCES LINKED TO IONIC TRANSDUCERS JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 221-224 BEQUIN P, UNIV MAINE,FAC SCI,ACOUST LAB,CNRS,URA 1101,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE Many studies have dealt with the realisation of ionic transducers, the most famous remaining the ionophone. These transducers combine two effects, one related to a heat source, and the other corresponding to a force distributed in the volume of the ionized area. This paper gives some basic equations describing the acoustic field generated by these two effects in the case of a Corona discharge; these show that each source predominates in a separate frequency range. These analytical results are compared with experiments, and show a good agreement. 0 4 MAY 1 NT300 J PHYS IV

Record 136 of 155 HERZOG P; LEROUX JC LOW-FREQUENCY MODELING OF AN ELECTRODYNAMIC LOUDSPEAKER JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 225-228 HERZOG P, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE Although many methods are commonly available to get the Thiele-Small parameters of electrodynamic loudspeakers, the need to obtain a greater resolution and a good robustness led us to develop a method based on an analytical estimation of statistical values of these parameters, using a minimum number of measurements at arbitrary frequencies. The increased resolution obtained permitted us to point out some phenomena related to the heating of the suspension, and occuring during the aging of drivers. An iterative process applied to our method has also given a good estimate for another parameter related to the viscoelasticity of the suspension. This aspect is shown to be cor-related to the material used for the cone surround, and may be responsible of some discrepancies observed betwen the parameter values obtained from different methods. 0 4 MAY 1 NT300 J PHYS IV

Record 137 of 155 DUBOS V; DALMONT JP; KERGOMARD J MEASUREMENT OF TRANSFER-MATRICES OF SIMPLE ACOUSTICS SYSTEMS JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 279-282 DUBOS V, UNIV MAINE,ACOUST LAB,BP 535,F-72017 LE MANS,FRANCE The purpose of the present paper is to measure the transfer matrix of acoustical, reciprocal elements of wave guides by using two microphones and several terminal tubes, by mean of the least mean square method. We apply this method for the case of a lateral chimney. The results are satisfactory, but the accuracy is not large enough to determine the anti symmetrical field in the chimney. 0 4 MAY 1 NT300 J PHYS IV

Record 138 of 155 PELORSON X; HRISCHBERG A; AUREGAN Y MODELING OF VOICED SOUNDS PRODUCTION USING A MODIFIED 2-MASS MODEL JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 453-456 PELORSON X, INST COMMUN PARLEE,CNRS,URA 368,46 AVE F VIALLET,F-38031 GRENOBLE,FRANCE EINDHOVEN UNIV TECHNOL,VAKGRP TRANSPORTFYS,5600 MB EINDHOVEN,NETHERLANDS UNIV MAINE,ACOUST LAB,F-72017 LE MANS,FRANCE VOCAL CORDS The two-mass model is very often presented as a simple but efficient model quite well adapted for the purpose of voiced sounds numerical simulation. It appear however that the description of the flow through the glottis is usually oversimplified. To some extent this point could explain the limits of the model. This paper proposes a more precise description of the flow through the glottis. In particular a quasi-steady moving flow separation point is introduced. A validation of the theory under unsteady-flow conditions is presented here. The importance of the revised flow model for phonation modelling is evaluated and discussed using a simple model for the vocal cords based on the well-known two-mass model. 0 4 MAY 1 NT300 J PHYS IV

Record 139 of 155 MALBOS F; BAUDRY M; MONTRESOR S DETECTION OF OCCLUSIVES USING A WAVELET TRANSFORM JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 493-496 MALBOS F, UNIV MAINE,INFORMAT LAB,CNRS,BP 535,F-72017 LE MANS,FRANCE This paper describes the detection of stop consonants in the French language with the help of the wavelet transform. Our hypothesis is that the burst of stop consonants can be approximated with a pulse. The detection system is based on the study of the correlation functions between the modulus of the impulse wavelet transform and the same transform of the speech signal. As we are using a Gaussian wavelet, the correlation functions have a minimum before each maximum, where that maximum is synchronous with the burst of the stop consonant. Two signals S(M) and S(m) are computed. The are respectively the synchronous and asynchronous sums of all the correlation functions. To localize the local minima of the S(m) function, two criteria are used. The temporal localisation of the pulse is accomplished with certain local maxima of the signal S(M). The method of detection is tested with a corpus which has 137 unvoiced and 55 voiced stop consonants. The rate of detection is 94% for the unvoiced stops and 75% for the voiced stops. This study shows that for detection, the burst of stop consonants can be modelled with a pulse. 0 4 MAY 1 NT300 J PHYS IV

Record 140 of 155 GAZENGEL B; GILBERT J NUMERICAL SIMULATIONS IN TIME AND FREQUENCY DOMAINS - COMPARATIVE-STUDY, APPLICATION TO SINGLE-REED WOODWIND INSTRUMENTS JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 577-580 GAZENGEL B, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE Time-domain simulations of single reed wind instruments can be powerfull tools if the differential equation governing the motion of the reed is solved with the help of a good numerical scheme. We present a set of different available numerical methods and pay attention to stability criteria and frequency response for each of them. We propose a modified second order implicit method and apply it to some resonators. 0 4 MAY 1 NT300 J PHYS IV

Record 141 of 155 GILBERT J; DALMONT JP; GAZENGEL B; GIROUD F; DURAND F ANALYSIS OF THE CLARINET USING INPUT IMPEDANCE MEASUREMENTS JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 581-584 GILBERT J, UNIV MAINE,ACOUST LAB,CNRS,URA 1101,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE resonance and playing frequency measurements have been made for the two first registers of clarinets. Results point out general tuning properties of the instrument. A comparative study has brought to light distinctive maker's choices between two different models. 0 4 MAY 1 NT300 J PHYS IV

Record 142 of 155 DALMONT JP; DUPIRE P INFLUENCE OF THE MAIN BORE ON ANHARMONICITY OF THE RESONANCE FREQUENCIES OF THE OBOE JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 653-656 DALMONT JP, UNIV MAINE,ACOUST LAB,BP 535,F-72017 LE MANS,FRANCE In this paper it is shown theoretically how a local change on the conicity of the main bore can reduce the anharmonicity of the resonance frequencies. A comparative study of three different oboes has been made. The measurement of the respective main bore explains partially the differences of the anharmonicity. 0 4 MAY 1 NT300 J PHYS IV

Record 143 of 155 LALIGANT Y; LALIGANT A; EMERY J; BUZARE JY COMPLEXES OF TETRACHLORO PALLADIUM(II) WITH ALANINE - SYNTHESIS, CRYSTAL-STRUCTURE AND SOLID-STATE NMR-STUDY OF (H-ALANINE)2 (PDCL4) EUROPEAN JOURNAL OF SOLID STATE AND INORGANIC CHEMISTRY 1994, Vol 31, Iss 4, pp 325-335 LALIGANT Y, UNIV MAINE,FAC SCI,FLUORURES LAB,CNRS,URA 449,AVE O MESSIAEN,F-72017 LE MANS,FRANCE UNIV LAVAL,FAC SCI AGR & ALIMENTAT,DEPT SCI & TECHNOL ALIMENTS,CTR STELA,QUEBEC CITY G1K 7P4,QUEBEC,CANADA UNIV MAINE,FAC SCI,CNRS,URA 807,F-72017 LE MANS,FRANCE METHIONINE (H-Alanine)2(PdCl4) is triclinic (space group P-1, Z = 1) with a = 6.4627(9)angstrom, b = 7.420(1)angstrom, c = 8.891(1)angstrom, alpha = 77.821(7), beta = 84.542(6) and gamma = 67.34(1)-degrees. The structure was refined from single crystal data using 2788 independent X-ray reflections to R1 = 0.0456, wR2 = 0.1192. The crystal structure of (H-Alanine)2(PdCl4) is built up by isolated PdCl4 square plane and two (CH3)(NH3+)CH-COOH groups and is described in term of a network of cationic ClH3Pd tetrahedra. Solid H-1 NMR study confirms the existence of the alaninium cation. 0 11 PB903 EUR J SOLID STATE INORG CHEM

Record 144 of 155 KUTOYANTS YA NONCONSISTENT ESTIMATION BY DIFFUSION-TYPE OBSERVATIONS STATISTICS & PROBABILITY LETTERS 1994, Vol 20, Iss 1, pp 1-7 UNIV PARIS,CNRS,URA 132,F-75252 PARIS,FRANCE UNIV MAINE,F-72017 LE MANS,FRANCE DIFFUSION PROCESS; PARAMETER ESTIMATION; NONCONSISTENCY We consider the properties of the maximum likelihood, Bayes and minimum distance estimates of the finite-dimensional parameter constructed by the observations of the process of diffusion type with the small coefficient of diffusion in the situation when the trend coefficients corresponding to the different values of the parameter are the same and the consistent estimation is impossible. It is proved that these estimates converge to the different random variables. 0 7 MAY 4 NY512 STAT PROBAB LETT

Record 145 of 155 BRUNEAU M ACOUSTICS OF CAVITIES - MODELS AND APPLICATIONS JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 675-684 BRUNEAU M, UNIV MAINE,CNRS,ACOUST LAB,AVE OLIVIER MESSIAEN,BP 535,F-72017 LE MANS,FRANCE BOUNDARY-LAYER ATTENUATION; HIGHER-ORDER MODES; TUBES The purpose of this paper is to present the main developments in the theory of the acoustics of dissipative fluids at rest in bounded spaces (principally cavities of different sizes and shapes ), from the early beginnings ( in the 1850' s ) until now, including a brief indication of possible approaches for future developments. Several applications of interest, and current research concerned with miniaturisation, are presented, with emphasis being given to the work done on the acoustic gyrometer and on its potential to be miniaturized, which include the miniaturization of acoustical transducers (on silicon chips). 0 10 MAY 2 NT301 J PHYS IV

Record 146 of 155 MOURAD A; DESCHAMPS M; CASTAGNEDE B ACOUSTIC-WAVE GENERATION IN AN ANISOTROPIC MEDIUM USING A LASER-BEAM JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 749-752 MOURAD A, UNIV BORDEAUX 1,MECAN PHYS LAB,F-33405 TALENCE,FRANCE UNIV MAINE,ACOUST LAB,F-72017 LE MANS,FRANCE The Lamb's problem for an elastic anisotropic and homogeneous half space is solved. The source is linear and contains in the free surface of this half space. A numerical calculation based on the Cagniard de Hoop method is performed, in the case of cubic symmetry. The free surface is parallel to a plane of symmetry. In addition, the line source may be parallel, or not, to an axis of symmetry. The displacement field is then calculated at any point of this half space, for various directions of this line source. This theoretical study may be applied to the generation of acoustic waves when using a laser beam focused by a cylindrical lens on a sample. The impact is then linear. 0 4 MAY 2 NT301 J PHYS IV

Record 147 of 155 PAGNEUX V; KERGOMARD J MULTIMODAL PROPAGATION IN A DUCT WITH VARYING CROSS-SECTION JOURNAL DE PHYSIQUE IV 1994, Vol 4, Iss C5, pp 797-800 PAGNEUX V, SMR,CTR RECH SCHLUMBERGER,BP 62005,MONTROUGE,FRANCE UNIV MAINE,ACOUST LAB,CNRS,UA 1101,F-72017 LE MANS,FRANCE Some authors have tried to calculate propagation in a varying cross section duct by slicing it into cylindrical elements with length small compared to wavelength. This enables to solve the wave equation with the multimodal decomposition formulation. The results compared favorably with experimental data. However, this approach have certain limitations and we, therefore, wanted to study this problem by writing continuous equations. First of all, we develop a matricial horns equation extending the classical Horn equation. Then, we find a matricial Riccati equation for the impedance matrix which is symmetric and only depends on the axial coordinate. This equation for the impedance avoid spurious divergence due to vanishing modes. Finally we are able to get the pressure or the velocity field by a calculation of a kind of argument matrix (similar to the usual jkx for plane wave) with another continuous equation slave to the matrix impedance variation. The computations are performed with a Runge-Kutta method of order 3 and are apllied to a particular geometry in the case of monopole source the solution of which is known for a straight duct. 0 4 MAY 2 NT301 J PHYS IV

Record 148 of 155 GUIRAUD MP; TIROT P; SIMONIN D; ALHOMSY M; VARACHE N; HAAS C SPONTANEOUS CLOSTRIDIAL MYONECROSIS ASSOCIATED WITH ACUTE-LEUKEMIA MEDECINE ET MALADIES INFECTIEUSES 1994, Vol 24, Iss 2, pp 121-122 CTR HOSP MANS,SERV REANIMAT MED POLYVALENTE,194 AVE RUBILLARD,F-72037 LE MANS,FRANCE GAS GANGRENE; CLOSTRIDIUM-PERFRINGENS; ACUTE LEUKEMIA Most clostridial infections arise by direct inoculation of soil or feces into tissues or by contiguous spread from the gastrointestinal tract or vagina usually after an injury. We report a case of spontaneous bifocal clostridial myonecrosis associated with acute leukemia. 0 2 FEB ND759 MED MAL INFEC

Record 149 of 155 BENARD D; FOUQUET JL EXPANSION OF CENTERED TRIANGULATIONS JOURNAL OF COMBINATORIAL THEORY SERIES B 1994, Vol 61, Iss 1, pp 92-102 BENARD D, UNIV MAINE,DEPT INFORMAT,F-72017 LE MANS,FRANCE LAB INFORMAT FONDAMENTALE ORLEANS,F-45067 ORLEANS 2,FRANCE We use a construction of A. Bouchet for covering triangulations by means of nowhere-zero dual flows, but slightly modified, to prove that whenever G is a simple graph, which is not a star, two-cell embedded in a surface S, and m is a non-negative integer not divisible by 2, 3, or 5, there is a covering two-cell embedding of G(m) in a surface S, orientable if and only if S is orientable, such that each face of the embedding of G and the faces above it in the embedding of G(m) have the same length. (C) 1994 Academic Press, Inc. 0 11 MAY NP019 J COMB THEOR B

Record 150 of 155 BLAQUIERE A; SIGALPAUCHARD M SCHRODINGER PROCESSES WITH UNBOUNDED OR SINGULAR POTENTIALS, CONDITIONAL SANOV PROPERTY COMPUTERS & MATHEMATICS WITH APPLICATIONS 1994, Vol 27, Iss 9-10, pp 103-120 BLAQUIERE A, UNIV PARIS,22 RUE PRAIRIE,F-92410 VILLE DAVRAY,FRANCE UNIV MAINE,FAC SCI,DEPT MATH & INFORMAT,F-72017 LE MANS,FRANCE This paper is concerned with a class of Schrodinger processes with ''creation'' and ''killing,'' with unbounded or singular potentials: existence of a solution to the corresponding Schrodinger's system, construction of the Schrodinger's bridge associated with it, variational characterization, and the conditional Sanov property. 0 18 MAY NK052 COMPUT MATH APPL

Record 151 of 155 VIVET M; LEROUX P; HUBERT O; MORANDEAU J; PARMENTIER C TELEASSISTANCE OF TRAINEES IN AN SME - A CASE-STUDY TELETEACHING 1993, Vol 29, pp 907-914 VIVET M, UNIV MAINE,LIUM,BP 535,F-72017 LE MANS,FRANCE AFP,F-72006 LE MANS,FRANCE FORMAT MULTIMEDIA,F-44000 NANTES,FRANCE CRCI,F-44027 NANTES 04,FRANCE COMPUTER USES IN EDUCATION; ORGANIZATIONAL IMPACTS; SOCIAL ISSUES; PHYSICAL SCIENCES AND ENGINEERING PLUME is a project which includes experimental training and research about the use of pedagogical micro-robotics in a computer resource centre in a small business. The training takes place in a small business in the town of SAUMUR for low-skilled manual workers. It is conducted by two training centres and a computer science laboratory. The experimental training consists of a local training process which is realized in the small business and teleassistance of the trainees with teachers who are in the towns of LE MANS and NANTES (90 km from SAUMUR). Teleassistance is a form of distance help including telephone help and computer-based distance assistance. It is this teleteaching aspect that we develop in this paper. We describe the training organisation and the articulation between the local and distance training activities. The case study is of a micro-robotics task using a distance approach. We have developped a distance teaching system based on telephone lines and teleassistance software. We have defined a scenario of the intervention between a group of trainees and teachers and defined a typology of telephone calls. We make many observations about the influence of this distance training on the attitudes of the trainees and on their progress. A few questions remain unanswered but we find that this kind of teaching provide a good solution for small businesses in the areas of new skills and training inside the factory. 0 8 IFIP TRANSACTIONS A-COMPUTER SCIENCE AND TECHNOLOGY BZ96W IFIP TRANS A

Record 152 of 155 HAMADENE S; LEPELTIER JP EQUILIBRIUM POINTS IN NONZERO SUM STOCHASTIC DIFFERENTIAL-GAMES COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE 1994, Vol 318, Iss 3, pp 251-256 HAMADENE S, UNIV ORLEANS,DEPT MATH,BP 6759,F-45067 ORLEANS 2,FRANCE UNIV MAINE,DEPT MATH,F-72017 LE MANS,FRANCE In this Note we consider the problem of equilibrium points on nonzero sum stochastic differential games. The process is a markovian diffusion stopped at the exit of a regular, bounded subset of R(m). We show the existence of an equilibrium point under weaker hypothesis than those of A. Friedman in his paper on the same subject [1]. The expression of the equilibrium point is given. Moreover, we use a probabilistic approach which is different from that of [1]. 0 6 FEB 3 MZ063 C R ACAD SCI SER I MATH

Record 153 of 155 BENOIT R DIABETIC NEPHROPATHY - SCREENING WITH MICRO-ALBUMIN URINE STICK (MICRAL TEST) PRESSE MEDICALE 1994, Vol 23, Iss 6, pp 300-300 BENOIT R, HOP MANS,SERV GASTROENTEROL,F-72037 LE MANS,FRANCE 0 1 FEB 12 MW964 PRESSE MEDICALE

Record 154 of 155 JELLIFFE R; LAFFONT A; BARBAUT X; GIRARD P; CHAPELLE G; POBEL C; BEROD T; PIVOT C; LACARELLE B; DEBORD J; BOISSEL J; MAIRE P PHARMACOKINETICS OF AMIKACIN IN A LARGE POPULATION USING THE NPEM ALGORITHM CLINICAL PHARMACOLOGY & THERAPEUTICS 1994, Vol 55, Iss 2, pp 160-160 USC,LOS ANGELES,CA HOSP CIVIL,LYON,FRANCE HOSP CIVIL,LE MANS,FRANCE HOSP CIVIL,SAINTES,FRANCE HOSP CIVIL,MARSEILLE,FRANCE HOSP CIVIL,PAPEETE,FRANCE HOSP CIVIL,LIMOGES,FRANCE 0 1 FEB MY421 CLIN PHARMACOL THER

Record 155 of 155 LAURIKS W; ALLARD JF; LAFARGE D; PLANTIER G RADIATION IMPEDANCE OF AN ARRAY OF SLITS ACUSTICA 1994, Vol 80, Iss 1, pp 87-89 LAURIKS W, CATHOLIC UNIV LEUVEN,AKOEST & WARMTEGELEIDING LAB,CELESTIJNENLAAN 200 D,B-3030 HEVERLEE,BELGIUM FAC SCI LE MANS,ECON LAB,URA 1101,F-72017 LE MANS,FRANCE 0 3 JAN-FEB MV890 ACUSTICA

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