Materials Literature
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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…
ABSTRACT: Copper(II) removal efficiency by vermiculite has been investigated through laboratory experiments. The removal phenomenon appears to be consistent with an ion‐exchange (exchange adsorption) process. The batch sorption equilibria follows Freundlich adsorption isotherm. The uptake of copper(II) is a function o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBarium lanthanum copper tin oxide (Ba2La2Cu2Sn2O11): a new layered perovskite with a modulated structureMark T. Anderson, Kenneth R. Poeppelmeier, Jin Ping Zhang, Han Jie Fan, and Laurence D. MarksCite this: Chem. Mater. 1992, 4, 6, 1305–1313Publication Date (Print):November…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR and ENDOR study of selected porphyrin- and phthalocyanine-copper complexesS. P. Greiner, D. L. Rowlands, and R. W. KreilickCite this: J. Phys. Chem. 1992, 96, 23, 9132–9139Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published in…
Usually the shape of the glass transition dispersion in the mechanical or dielectric spectra of pure polymers is skewed toward higher frequencies. In miscible polymer blends not only is this peak broader than in pure polymers, the broadening is often asymmetric towards lower frequencies. Concentration fluctuations are…
Molecular design, microstructure, and physical properties of polymers are strongly related to each other. A better understanding of their interdependence will give the polymer chemist useful ideas for the synthesis of new macromolecules. The present paper aims to compare the thermal behavior of aryl polycondensates ba…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of pyrazole-bridged metalla-bis(dicarbollide) derivatives of cobalt, nickel, copper, and iron: models for venus flytrap cluster reagentsAravamuthan Varadarajan, Stephen E. Johnson, Frank A. Gomez, Sarmistha Chakrabarti, Carolyn B. Kn…
A new technique for the preparation of porous vascular prostheses was investigated. Polyurethane solution (5 to 15 wt%) was injected into a mold. After freezing at low temperature (0 degrees C-196 degrees C), solvents were dissolved out with water at 0 degrees C to form porous tubes. The average pore size (several mic…