Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of substituents on the photochemical behavior of cross-conjugated cyclohexadienones. Facile total synthesis of (-)-cyclocolorenoneDrury Caine and Paul F. IngwalsonCite this: J. Org. Chem. 1972, 37, 23, 3751–3752Publication Date (Print):November 1, 1972Publication H…
Measurements of the yield-stress and of the strain-rate sensitivity in compression over the temperature range 14—373°C are reported for single crystals of niobium of two purities and for niobium alloy single crystals containing up to 25 a/o molybdenum or 9 a/o rhenium. As the solute content increases, the maximum in t…
Abstract The general conditions for the occurrence of a coincidence site lattice, i.e., for partial coincidence of lattice points in two identical crystal lattices, are derived and a method is outlined for determining the degree of coincidence. The question of atomic coincidence in two actual crystals is discussed, le…
Approximate values for the threshold energies, threshold cross-sections, and the energy dependence of the cross-sections for K-shell photoionization are tabulated for H, He, C, N, 0, Ne, Mg, Si, and S in all stages of ionization.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of axial ligation in metalloporphyrins. I. Imidazole exchange in low-spin ferric porphyrinsGerd N. La Mar and F. Ann WalkerCite this: J. Am. Chem. Soc. 1972, 94, 24, 8607–8608Publication Date (Print):November 1, 1972Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMesomorphic properties of some ring-methylated phenyl benzoyloxybenzoatesWilliam R. Young, Ivan Haller, and Dennis C. GreenCite this: J. Org. Chem. 1972, 37, 23, 3707–3712Publication Date (Print):November 1, 1972Publication History Published online1 May 2002Published inissue…
Broad emission4ine profiles from diverse astronomical objects have been interpreted as due to rapid radial outflows of matter. Estimates of characteristic electron densities lead to the conclusion that the effect of electron scattering on the line profiles may be substantial. A Monte Carlo method is employed to treat…