Materials Literature
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Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
By means of a gas‐tight electrochemical cell, oxygen permeation measurements have been performed on the oxygen ion conductor 8 mole percent (m/o) yttria‐stabilized zirconia, as a function of T (800°–1050°C) and p O 2 (0.21–10 −17 atm). Ionic conductivity was measured by the conventional four‐probe method. The followin…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Geometric measure theory is the mathematical framework for the study of crystal growth, clusters of soap bubbles, and similar structures involving minimization of energy. Morgan emphasizes geometry over proofs and technicalities, and includes a bibliography. This Second Edition features a new chapter on soap bubbles.
Etude experimentale de la variation de la durete en fonction de la grosseur de grain pour des materiaux nanocristallins. En contraste avec la relation de Hall-Petch, cette analyse, realisee sur le cuivre et le palladium a la temperature ambiante, montre un decroissement de la durete lorsque la grosseur de grain decroi…
The present review deals with the latest achievements in the chemistry of ionic melts and liquid crystals (LC). New liquid crystals, formed by salt melts containing organic ions, have been described. The characteristics of their thermodynamic and transport behaviour, structure, and optical properties have been examine…
The third-order optical susceptibility of the Pt, Pb, and metal-free tetrakis(cumylphenoxy)phthalocyanines was measured by degenerate four-wave mixing at 1.064 μm, far from strong absorption bands. Metal substitution strongly enhances the off-resonant χ(3). The χ(3)xxxx for Pt-phthalocyanine (2×10−10 esu) and Pb phtha…
Radiation-induced changes in high-purity fused silica during prolonged irradiation with a pulsed laser at 193 nm have been studied. Radiolytically induced UV absorption bands, an increase in index of refraction, and stress birefringence are observed. The formation mechanisms are analyzed in terms of radiolytic atomic…
Abstract A systematic study of dielectric spectrum on a series of high and low density commercial polyethylenes has been performed. Every polyethylene was characterized by determination of molecular weight distribution, the number of functional groups: ketone, aldehyde, vinyl, vinylidene, trans ‐vinylene, the fraction…
Abstract The novel allenic epoxycyclohexanes 1 , and related compounds 2 and 3 have been isolated from the culture medium of Eutypa lata. Their structures were established by combination of spectroscopic and chemical techniques. Biogenetic origin and biological activity of these compounds are also discussed.
Abstract Natural rubber–polyolefin (70/30) blends have been studied by incorporation of modified rubber and plastic phases with a view to make the heterogeneous phases compatible. The modified rubbers used were epoxidized natural rubber (ENR) and sulfonated ethylene–propylene diene rubber (S‐EPDM) at a level of 20 par…
Abstract A comparative study is undertaken of the dielectric relaxation spectra of poly(methyl acrylate), poly(ethyl acrylate), and poly(butyl acrylate), taking into consideration the spectra of the corresponding polymers in the series of the polymethacrylates. The three polymers, PMA, PEA, and PBA, present an α relax…
Polyester Polyols from Glycolyzed PET Waste: Efect of Glycol Type on Kinetics of Polyesterification*hydroxyl to carboxyl ratio, to obtain the polyester polyols.The kinetics of polyesterification of the three glycolyzed PET products with adipic acid under conditions comparable to commercial scale processing is reported…
The cofactor requirements of dehydroquinate synthase from Escherichia coli have been characterized. The homogeneous enzyme, purified from the overproducing strain RB791 (pJB14), is a monomeric metalloenzyme of Mr = 39,000 that contains 1 mol of tightly bound Co(II) according to atomic absorption analysis. The holoenzy…
Helical complexes formed between fd DNA and reductively methylated fd gene 5 protein were indistinguishable by electron microscopy from complexes formed with the nonmethylated protein. 13C NMR spectroscopy of 13C-enriched N epsilon, N epsilon-dimethyllsyl residues of the protein showed that three of these residues (Ly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLong-range electron transfer in multisite metalloproteinsHarry B. Gray and Bo G. MalmstroemCite this: Biochemistry 1989, 28, 19, 7499–7505Publication Date (Print):September 19, 1989Publication History Published online1 May 2002Published inissue 19 September 1989https://pubs.…
Different approaches to the theoretical study of the local centres in solids are discussed. Particular attention is paid to the embedded-cluster models. There are given the mathematical formulation, the computational scheme and applications for some local centres on/in graphite monolayers of the moderately large embed…
Molecular dynamics computer simulations have been made of the ordered low-temperature and orientationally disordered high-temperature phases of crystalline sodium nitrate. The interionic force model used in the simulations is based on a rigid-ion representation of the electrostatic interactions, supplemented by a set…
The laser-induced deposition of high-purity aluminum metal has been achieved by pyrolytic decomposition of trimethylamine aluminum hydride. The chemical structure of the precursor affords a high ambient vapor pressure which results in rapid rates of aluminum film formation. In addition, the precursor is nonpyrophoric,…
We suggest that weak electron tunneling between layers is responsible for the experimentally observed dramatic deviations from two-dimensional behavior in the magnetoresistance in the metallic phase of the quasi-two-dimensional conductors (TMTSF${)}_{2}$${\mathrm{ClO}}_{4}$ and (TMTSF${)}_{2}$${\mathrm{PF}}_{6}$. We p…