Materials Literature
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Saturation magnetization, intrinsic coercive force, anisotropy field, and anisotropy constants were determined for a sample of sintered Co5Sm at 4.2, 77, 300, and 500 °K. The ralationship between the temperature dependence of the coercivity and the anisotropy parameters is discussed.
1. The properties and kinetics of the 2,3-diphosphoglycerate-dependent phosphoglycerate mutases are discussed. There are at least three possible mechanisms for the reaction: (i) a phosphoenzyme (Ping Pong) mechanism; (ii) an intermolecular transfer of phosphate from 2,3-diphosphoglycerate to the substrates (sequential…
Values of the Grüneisen parameter γ reported in the literature for polyethylene (PE) vary over nearly four orders of magnitude. Part of the reason for this wide variation is the variety of definitions and experimental techniques used in obtaining γ. A simple unified derivation of these equations will be presented in a…
Self-diffusion coefficient of oxygen in polycrystalline MgO can be represented by D=4.5×10−5exp(−60200/RT)cm2/sec for 80–115 mesh particles and by D=1.3×10−5exp(−60200/RT)cm2/sec for 170–200 mesh particles. These two activation energies are exactly the same, but the magnitude of the diffusion coefficients varied from…
Photoelectron energy degradation calculations have been performed with the improved analytic expression for the photoelectron to ambient electron energy transfer rate given by Swartz et al. (1971). On the basis of these calculations, two curves for the mean energy transferred per photoelectron to the ambient electrons…
Abstract α-Ketoglutarate synthase from the photosynthetic bacterium Chlorobium thiosulfatophilum, an enzyme that catalyzes the formation of α-ketoglutarate by a reductive carboxylation of succinyl-CoA, was purified about 120-fold by high speed centrifugation, fractionation with protamine sulfate, column chromatography…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of metalloporphyrin complexes. Ligand photoisomerization via intramolecular energy transferDavid G. Whitten, Peter D. Wildes, and Carol A. DeRosierCite this: J. Am. Chem. Soc. 1972, 94, 22, 7811–7823Publication Date (Print):November 1, 1972Publication History…
Properties of general lattice systems are investigated using the group properties of such systems. The duality transformation is generalized and is expressed in terms of exact short sequence between the groups associated with one lattice and the groups associated with the dual lattice. A general method is given for co…
Quantitative measurements were made of self-climb of dislocation loops, b = 1 2<101>, in magnesium oxide single crystals. The rate of motion of pairs of co-planar loops was studied by repeated observation of the same areas of a thin foil during a series of annealing treatments. Values 60 300±3500 cal/mol for the activ…
A method is described for quick alignment of photolithographic masks over silicon substrates. Moiré reflection patterns are observed from grids etched on the silicon wafer and grids located on the photolithographic masks. A restricted class of moiré patterns provides information on both the direction and degree of mis…
The polarized crystal spectra of CsNiCl3, CsNiBr3, and nickel(II) doped into the isostructural magnesium salts, CsMgCl3 and CsMgBr3, have been investigated in the near infrared and visible region. The spectra can be satisfactorily interpreted using the Liehr and Ballhausen ligand field model for a d8 system in an octa…
Pt shadowing, Au decoration, OsO4 staining, electron diffraction, and bright- and dark-field electron microscopy have been used to elucidate strained and unstrained thin-film morphology of natural rubber. Unstrained natural rubber exhibits a 100–150-Å nodular morphology in the melt at room temperature. When cooled bel…
Abstract The addition of water to the reaction of isocyanates with carboxylic acid anhydrides has been observed to increase markedly the rate of formation of the corresponding imide. This effect has been observed with both monofunctional and difunctional reagents as well as in different solvents. Evidence is presented…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of bridged lanthanide(III) complexes. Diaquotri(nicotinic acid)holmium(III) hexa(isothiocyanato)chromate(III) dihydrate and diaquotris(isonicotinato)lanthanum(III)Jack Kay, Jerry W. Moore, and Milton D. GlickCite this: Inorg. Chem. 1972, 11, 11, 2818–2827P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphonitrilic compounds. XV. High molecular weight poly[bis(amino)phosphazenes] and mixed-substituent poly(aminophosphazenes)H. R. Allcock, W. J. Cook, and D. P. MackCite this: Inorg. Chem. 1972, 11, 11, 2584–2590Publication Date (Print):November 1, 1972Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimerization and .pi.-bonding of a zinc porphyrin cation radical. Thermodynamics and fast reaction kineticsJ. H. Fuhrhop, P. Wasser, D. Riesner, and D. MauzerallCite this: J. Am. Chem. Soc. 1972, 94, 23, 7996–8001Publication Date (Print):November 1, 1972Publication History P…
Observations on the migration of sub-grain boundaries during high-temperature testing of aluminium are presented. It is shown that the migration contributes significantly to the overall strain rate of the specimen and that the stress dependence and temperature dependence are in accord with the macroscopic strain rate,…
Numerical coupled-channel two-state calculations have been employed to yield a reducedtotal-cross-section curve as a function of reduced velocity for the case where the potential curves lie parallel to one another and there is an exponential coupling between them. This plot may be used to estimate the energy dependenc…
A brief review of the vacuum metallurgical processes used for the production of high performance aircraft bearing steels is presented. Primary vacuum induction melting of M50 bearing steel in the Therm-I-Vac furnace and subsequent vacuum arc remelting has brought about a two- to threefold improvement in rolling contac…
Elastic cross sections for electron scattering from $^{31}\mathrm{P}$ and $^{32}\mathrm{S}$ are given for the momentum-transfer range from 0.7 to 2.9 ${\mathrm{fm}}^{\ensuremath{-}1}$. The data were analyzed by means of a phase-shift code using phenomenological Fermi charge distributions modified with small undulation…