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。
The question of which of the known smetic phases exhibitis long range 3 dimensional order is first discussed briefly, The major theme of the paper is the nature of the structure and correlations in SB, SF, and S1 phases. Results are presented about the temperture dependence of the interlayer stacking arrangement and t…
The stability of various planar faults on the {111} and {100} planes of A3B alloys having the L12 structure is investigated using two methods. First, the crystallography of the faulted lattice is examined for indications of which types of faults are expected to be stable on the basis of symmetry. It is shown that supe…
A modification of a previously defined virtual orbital transformation based on the Hartree–Fock exchange potential is shown to yield a set of orbitals which effectively approximate the frozen natural orbital CI convergence properties.
Abstract Hermann Staudinger , the founder of polymer chemistry, would have been 100 years old this year. One of the key materials with which he elucidated the structure of high polymers was polystyrene.—Polystyrene, one of the most important thermoplastics, has now been manufactured industrially for some 50 years. Not…
The compound La x Sr, 1‐x TiO 3 with x up to 40 at. % is observed to be homogeneous by microscopic examination. The observed X‐ray powder pattern corresponds to the cubic perovskite structure. The plot of lattice constant a 0 vs x indicates a Vegard's law dependence within the experimental error. There were no extrane…
David L. Kuhn, James L. Plafkin, John Cairns, Jr., Rex L. Lowe, Qualitative Characterization of Aquatic Environments Using Diatom Life-Form Strategies, Transactions of the American Microscopical Society, Vol. 100, No. 2 (Apr., 1981), pp. 165-182
Resistivity, Hall voltage, magnetic susceptibility and Mössbauer parameters of Fe0·25NbS2 and Fe0·33NbS2 have been measured on powders and on single crystals as a function of the temperature, from 4·2 to 300 K. The structures of both compounds are related to the NbS2–2s type (hexagonal cell a, c) with the Fe ions form…
From a thermodynamical point of view, hydrostatic pressure should increase the interaction between dislocations. It has been used to explain their annihilation or removal from a crystal. In this paper it is shown that the pressure-induced increase of crystal lattice friction impeding dislocation movement (Peierls stre…
Abstract When spruce wood was treated with 20% aqueous NaOH, only partial conversion of cellulose I to cellulose II took place. In contrast, complete conversion occurred when a low yield kraft pulp from the same wood was mercerized. This difference in behavior is interpreted in terms of restricted swelling of the wood…
Novel experiments on dielectric heating were made to induce changes of temperature ΔT in nematic liquid crystal layers. Measurements of the dependence of ΔT on cell voltage, driving frequency, electrode spacings, external cell temperature and liquid crystal material parameters are correlated with molecular relatxation…
X-ray photoelectron spectra of pure uranium metal and stoichiometric uranium dioxide have been obtained using an AEI ES300 spectrometer. Binding energy values for core and valence electrons have been determined using an internally calibrated energy scale and monochromatic Al Kα radiation. Satellite peaks observed acco…
The crystallography of the domains and domain walls in lead zirconate titanate are studied using electron diffraciton and transmission electron microscopy. Both 90 ° and 180 ° domains are observed and the 90° domains are shown to be deformation twins with displacement along 〈110〉 on {110}. The thickness of the 90 ° do…
The general problem of the one-dimensional linearized simultaneous equations of magnetothermoelasticity has been solved in the Laplace transform domain by following the state space approach of modern control theory. The results obtained can be used to generate solutions in the Laplace transform domain to a broad class…
Acoustic mode lattice scattering plays an important role in determining the carrier mobility in elemental semiconductors over a wide range of temperature. For germanium and silicon, over the temperature range of interest, these longitudinal acoustic phonons are primarily scattered by isotopes and chemical impurities.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of metalloporphyrin .pi. radicals. 1. Complexation of zinc tetraphenylporphyrin cation and anion radicals with nitrogenous basesK. M. Kadish, L. R. Shiue, R. K. Rhodes, and L. A. BottomleyCite this: Inorg. Chem. 1981, 20, 4, 1274–1277Publication Date (Print):April…
Abstract The most effective smoke retarders for poly(vinyl chloride) are compounds of transition metals, such as molybdenum trioxide. MoO 3 when added to a rigid PVC compound shows three general effects. First, smoke formation is reduced dramatically as measured either by the NBS smoke chamber test or Goodrich smoke–c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew tungstophosphates: Cs6W5P2O23, Cs7W10PO36, and Cs7Na2W10PO37W. H. Knoth and R. L. HarlowCite this: J. Am. Chem. Soc. 1981, 103, 7, 1865–1867Publication Date (Print):April 1, 1981Publication History Published online1 May 2002Published inissue 1 April 1981https://pubs.acs.…
An X‐ray method to determine the transformation zone size in ceramics containing tetragonal ZrO 2 is described. Results obtained on plane fracture surfaces of various composites were correlated to mechanical property data and TEM observations and were found to be in good agreement. This indicates that the method prese…
A computer program has been written with the aim of calculating the domain of an atom in a structure. The domain may be limited by planes situated half-way between the atoms, or at a distance that takes into account the relative radii of the atoms. Data concerning this domain and the corresponding coordination polyhed…
We have shown experimentally that some cholesteric liquid crystals in cells with parallel or skew director orientations at the two surfaces may be made to have two bistable laminar states that can be switched either way by applying temporary electric potentials between the surfaces. Numerical solutions of the Oseen-Fr…