Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
This paper reviews the history of IBM contributions over the last quarter century to electronic structure theory. The two main sections of the paper deal with large-scale computations in quantum chemistry and the study of the electronic structure of solids. The paper briefly discusses the methods of ab initio quantum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVolume dependence of the elastic equation of state. 2. Solution-cured poly(dimethylsiloxane)R. W. Brotzman and B. E. EichingerCite this: Macromolecules 1981, 14, 5, 1445–1448Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published ini…
Abstract Polarizing microscope, electron microprobe and X-ray diffraction examination of minerals in a soil profile developed on a glauconite sand indicate that destabilization of glauconite can be a progressive process which appears to be the reverse of glauconitization. Glauconite in these soils appears to be destab…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoresponsive polymers. Dynamics of conformational changes of polyamides with backbone azobenzene groupsMasahiro Irie and Wolfram SchnabelCite this: Macromolecules 1981, 14, 5, 1246–1249Publication Date (Print):September 1, 1981Publication History Published online1 May 200…
Abstract From studies of a series of accelerated sulfur vulcanizations of natural rubber, the structural basis of the reversion in macroscopic physical-mechanical properties has been determined. The amount of chemically induced trans -methine butadiene-like structure increases as the reversion process proceeds. When t…
Abstract Gas evolution and oxygen consumption in the γ‐irradiation of PVC were studied. The gas evolution and the oxidative degradation are retarded by the presence of plasticizers and stabilizers. The G (HCI) and G (H 2 ) and 8 and 0.24 for the irradiation of pure PVC under vacuum and 0.02 and 0.14 for that of plasti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of metalloporphyrin .pi. radicals. 2. Thin-layer spectroelectrochemistry of zinc tetraphenylporphyrin cation radicals and dications in the presence of nitrogenous basesK. M. Kadish and R. K. RhodesCite this: Inorg. Chem. 1981, 20, 9, 2961–2966Publication Date (Prin…
Abstract The study of the effect of thickness on the mass uptake is shown to be quite helpful in the understanding of the complexities of polymer/organic penetrant sorption behavior. Isothermal diffusion results for methanol, acetone, and carbon tetrachloride in polycarbonate plates and films of various thicknesses ra…
This paper presents measurements of ionic conductivity in single crystals of Li + and mixed Li + /Na + beta alumina. The crystals were prepared by ion exchange of Na + beta alumina crystals in , , or with added. The measured room temperature conductivity of Li + beta alumina, about , is higher than earlier values. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen and nitric oxide complexes of rhodium porphyrinsBradford B. Wayland and Alan R. NewmanCite this: Inorg. Chem. 1981, 20, 9, 3093–3097Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published inissue 1 September 1981https://pubs…
Applying the Newman superposition model to the ligand-field splitting of tetrahedrally and octahedrally coordinated ${\mathrm{Fe}}^{3+}$ and ${\mathrm{Mn}}^{2+}$ ions in glass, we have obtained analytical expressions for the dependence of the spin-Hamiltonian parameters ${b}_{2}^{m}$ ($D$ and $E$) on the distortion fr…
Abstract Physical aging of semicrystalline poly(ethylene terephthalate) has been investigated as a function of crystalline content. Stress–strain, stress relaxation, and differential scanning calorimetry experiments were used to monitor the physical aging process. Both the overall extent and the rate of physical aging…
To overcome the disadvantages of a small starting set in MULTAN a technique is described whereby a large number of phases are given random values with low weights and then refined by a weighted tangent formula. The effectiveness of the process depends quite critically on assigning suitable weights to phase estimates a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of the hydrogen storage material Mg2NiH4. 1. Cubic high-temperature structureK. Yvon, J. Schefer, and F. StuckiCite this: Inorg. Chem. 1981, 20, 9, 2776–2778Publication Date (Print):September 1, 1981Publication History Published online1 May 2002Published i…
Alumina single crystals were compressed perpendicular to the [0001] axis at a constant strain rate between 20° and 950°C. At r>200°C, failure was suppressed by_hydrostatic pressures of 500 to 1500 MPa. Prismatic slip {1120}〈1100〉 was deduced from optical observations of the lateral surfaces and from stress‐optical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReexamination of the crystal and molecular structure of tricarbonyl(.eta.5-cyclopentadienyl)manganese(I): structural and spectroscopic evidence for a distortion of the cyclopentadienyl ring framework and its implications on bonding in a molecule possessing cylindrical symmet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, structures, and reactions of molybdenum complexes with sulfido and disulfido ligandsM. Rakowski DuBois, D. L. DuBois, M. C. VanDerveer, and R. C. HaltiwangerCite this: Inorg. Chem. 1981, 20, 9, 3064–3071Publication Date (Print):September 1, 1981Publication History…
We report the direct measurement, by x-ray photoemission spectroscopy, of the valence-band discontinuity, ΔEv, for two types of abrupt GaAs–AlAs (110) heterojunctions grown by molecular beam epitaxy: (i) those formed by growth of GaAs on AlAs, and (ii) those grown in the reverse sequence, AlAs on GaAs. The ΔEv at GaAs…
A series of aromatic polyesters based on either poly(chloro-p-phenylene terephthalate) or poly(methyl-p-phenylene terephthalate) modified by incorporation of various amounts of bisphenols of different structures were prepared and their thermotropic liquid crystal properties were studied by several methods including: (…
Abstract Molecular aggregation in a commercial polyimide film, Du Pont Kapton, was investigated by small‐angle x‐ray scattering (SAXS). From the analysis of the desmeared SAXS curve, it is concluded that aggregation in the Kapton film can be elucidated in terms of a two‐phase structure having electron density fluctuat…