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。
Abstract The tissue‐specific fibroin product of the large ampullate glands of the spider Nephila clavipes was isolated and analyzed with respect to homogeneity and size. The solubilized luminar contents of the glands migrate as a homogeneous band in SDS electrophoresis. Its molecular mass has been estimated to be appr…
The optical properties of freestanding and dielectrically backed inductive metal meshes are investigated in the far IR spectral regime. The most pronounced effect of the substrate is to cause a shift in the diffraction edge to longer wavelengths by a factor equal to the substrate index of refraction. Various theoretic…
Abstract The catalyst system obtained by the equimolar reaction of diethylaluminium chloride with α,β,γ,δ‐tetraphenylporphine exhibits high catalytic activity in the polymerization of propylene oxide to give a polymer with a narrow molecular weight distribution. Average molecular weight of the polymer can be controlle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinuclear complexes of macrocyclic ligands: variation of magnetic exchange interaction in a series of six-coordinate iron(II), cobalt(II), and nickel(II) complexes and the x-ray structure of a binuclear iron(II) macrocyclic ligand complexClifford L. Spiro, Susan L. Lambert,…
We report measurements of the equilibrium concentration and of the elastic modulus for polystyrene networks containing controlled amounts of pendent chains that have been swollen in benzene and cyclohexane. The results are compared with the predictions of the classical theory of rubber elasticity and of a new approach…
The critical β for stability against ideal hydromagnetic internal ballooning modes as a function of the toroidal mode number, n, is calculated for two different equilibrium sequences by use of a finite-element technique (n ≲ 20), and a WKB formalism (n ≳ 5). The agreement between the two methods is good in the overlap…
The radiation damage produced by low-dose 80 keV Ni+ and W+ heavy-ion bombardment of Ni, Ni/Cr 8%, Ni/Cr 17%, Fe/Ni 10%/Cr 17% and a 321 austenitic stainless steel has been studied by means of transmission electron microscopy. In all materials small vacancy loops were observed, produced heterogeneously by the collapse…
Abstract Al-substituted goethites were prepared by rapid oxidation of mixed FeCl 2 -AlCl 3 solutions at pH 6.8 in the presence of CO 2 at 25°C. A combination of Al substitution and adsorption of CO 2 reduced crystal size (except for an increase at small additions of Al) and produced unusual thin, porous particles. Pro…
Abstract The influence of rubber particles on rheological properties of styrene‐acrylonitrile, and poly(vinyl chloride) was investigated. The temperature dependence of the viscosity functions was found to be independent of the kind of rubber and its concentration. The extrudate swell becomes smaller with increasing pa…
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…