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。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the 1:2 aluminum trichloride-tetrahydrofuran complex AlCl3.2THFAlan H. Cowley, Mike C. Cushner, Raymond E. Davis, and Paul E. RileyCite this: Inorg. Chem. 1981, 20, 4, 1179–1181Publication Date (Print):April 1, 1981Publication History Publi…
An approach to determining synchronous machine parameters by low-voltage frequency response tests with the machine stationary will be described. The tests are simple and safe. In addition, they provide a more detailed and complete model of the machine than the accepted standard methods/1/. The standard tests rely heav…
The influence of the flexibility of the polymer main chain on the smectic ordering has been investigated, by means of optical, diffractometric and calorimetric techniques, in several polymers carrying rigid anisometric side-groups. The effect of the chemical structure of the sidegroups has been examined throughout: at…
Field studies using a chamber technique to measure emissions of nitrous oxide (N 2 O) showed that the N 2 O emissions induced by fertilization of soil with anhydrous ammonia (180 kg N ha −1 ) were markedly reduced by addition of nitrapyrin [2‐chloro‐6‐(trichloromethyl)‐pyridine] to this fertilizer. The emission of N 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal growth, electrical resistivity, and magnetic properties of lanthanum titanate and cerium titanate. Evidence for a metal-semiconductor transitionDavid A. MacLean and J. E. GreedanCite this: Inorg. Chem. 1981, 20, 4, 1025–1029Publication Date (Print):April 1, 1981Publi…
A comprehensive treatment of ATR spectra on the basis of the Lorentz-Lorenz law and Fresnel equations is given. The standard equation for the effective thickness is redefined showing how the lossy case deviates from the lossless case. A matrix effect due to the influence of the real part of the refractive index within…
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…