Materials Literature
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Methods for automatic structure determination [Pavelčík (1988). Acta Cryst. A44, 724–729] have been extended by routines utilizing Patterson peaks and a new version of the XFPS computer program [Pavelčík, Rizzoli & Andreetti (1990). University of Parma, Italy, and Komensky Univ., Bratislava, Czechoslovakia] has been d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of two new quaternary chalcogenides, CaYbInQ4 (Q = S and Se), with an olivine-type structureJames D. Carpenter and Shiou Jyh HwuCite this: Chem. Mater. 1992, 4, 6, 1368–1372Publication Date (Print):November 1, 1992Publication History Published…
Unexpectedly stable, 2 is the first mononuclear Ir II complex whose ligands are bound exclusively through C atoms. Complex 2 , prepared by oxidation of 1 with I 2 or Ag + , is close to square planar. The phenyl rings are almost perpendicular to the metal's coordination plane; the ortho Cl atoms are quite close to the…
The migration of subgrain boundaries and the development of the dislocation structure have been studied with the etch pit technique in the transient range of creep of pure <100>-oriented LiF single crystals after large stress reductions, which were performed in the steady state of compressive creep at 773 and 923 K (i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCadmium sulfide-particle-mediated transmembrane photoelectron transfer in surfactant vesiclesOtto Horvath and Janos H. FendlerCite this: J. Phys. Chem. 1992, 96, 24, 9591–9594Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published ini…
The microstructure of ethylene/vinyl chloride (E/VC) copolymers, prepared by partial reduction of PVC with a variety of reagents, was analyzed using carbon-13 NMR spectroscopy. The effect of the reduction mechanism on the microstructure and stereochemistry of the copolymers was studied. The reduction with tri-n-butylt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility in blends of copolymers: sequence distribution effectsChai Zhikuan, Sun Ruona, and Frank E. KaraszCite this: Macromolecules 1992, 25, 23, 6113–6118Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November…
We present the results of the experimental studies of the low temperature transport and magnetic properties of PbTe, Pb1-xSnxTe (x < 0.3) and SnTe crystals doped with 0.5 at.% of chromium. Cr was found to be a resonant donor in PbTe and PbSnTe. Magnetic susceptibility measurements revealed that PbTe:Cr and Pb1-xSnxTe:…
The effect of strain rate on tensile and compressive mechanical properties of sheet steels is investigated experimentally and analytically. Three sheet steels are studied in both longitudinal and transverse directions under different strain rates and different amounts of prior cold stretching. In order to determine th…
Original material of Diatoma fasciculatum C. A. Agardh 1812, Diatoma tabulatum C. A. Agardh 1832, and Synedra affinis Kützing 1844, has been studied. Lectotypes are selected for Diatoma fasciculatum and Diatoma tabulatum. The type material of Diatoma fasciculatum agrees with Tabularia fasciculata (C. A. Agardh) Willia…
Abstract The calcite saturation status of soil‐water systems in semiarid regions was reexamined taking into consideration organic ligand alkalinity and Ca‐organic complexation. These factors have been forwarded as the reason for earlier reports of calcite supersaturation in soil‐water systems. We examined groundwaters…
The conducting oxy salt Ag(Ag3O4)2NO3 has been electrodeposited onto highly oriented conducting oxides of Tl203 and Pb0Tl(,Oc. T12O3 was grown in a [100] texture while the mixed oxide PbaTlbOc was grown with two different thickness-dependent textures of [110] and [210]. The orientation of the Ag(Ag3O4)2NO3crystals wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface ordering of block copolymersXin Chen, Joseph A. Gardella Jr., and Philip L. KumlerCite this: Macromolecules 1992, 25, 24, 6631–6637Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992https://pubs.acs…
Superelastic nickel-titanium archwires, unlike conventional wires, are capable of withstanding very large deflections and on returning to their original shape on deactivation will produce more moderate forces. The region over which there is a 'plateau' depends on the deflection and is greater the larger the deflection…
A simple refinery-specific correlation has been established between the total fouling rate and tube wall temperature of individual heat exchangers in the preheat exchanger train of a crude oil distillation unit. The correlation has been obtained from plant data, and has subsequently been used successfully to predict t…
The hardest known materials , diamond and cubic boron nitride, are thermodynamically stable only at high pressure and temperature. Chemical vapor deposition and sputtering have offered low‐pressure alternatives to the traditional synthetic methods and these techniques have recently been exploited for the production of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTValence contrast by synchrotron resonance scattering: application to a mixed-valence manganese compoundY. Gao, A. Frost-Jensen, M. R. Pressprich, P. Coppens, A. Marquez, and M. DupuisCite this: J. Am. Chem. Soc. 1992, 114, 23, 9214–9215Publication Date (Print):November 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-angle neutron scattering evaluation of the temperature dependence of atactic polypropylene and poly(1-butene) chain dimensions in the meltA. Zirkel, V. Urban, D. Richter, L. J. Fetters, J. S. Huang, R. Kampmann, and N. HadjichristidisCite this: Macromolecules 1992, 25,…
The gene encoding methylaspartase (EC 4.3.1.2) from Clostridium tetranomorphum has been cloned, sequenced, and expressed in Escherichia coli. The open reading frame (ORF) codes for a polypeptide of 413 amino acid residues (M(r) 45,539) of which seven are cysteine residues. The size of the ORF indicates that methylaspa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox chemistry of water-soluble iron, manganese, and chromium metalloporphyrins and acid-base behavior of their lyate axial ligands in aqueous solution: influence of electronic effectsSeungwon Jeon and Thomas C. BruiceCite this: Inorg. Chem. 1992, 31, 23, 4843–4848Publicati…