Materials Literature
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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…
This paper discusses some of the physical processes involved in the flashover of insulators with contaminated surfaces. Past theories of discharge propagation across moist films are reviewed and found to be unsatisfactory in certain respects. To better account for what is observed, it is proposed that under certain co…
Abstract Porous films of poly(hydroxy ethyl methacrylate) have been made by photo‐polymerisation of solutions of the monomer. The permeability of homogeneous films depends on the cross‐link density and the concentration and composition of the polymerisation solvent. A membrane of minimum water permeability, in which t…
The use of various organic compounds in solution and inorganic ions in glasses has been investigated as possible fluorescence Standard Reference Materials. Emphasis was placed on measuring physical and chemical parameters such as stability, reproducibilities of absorbance and fluorescence measurements, relative quantu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of oligothymidylates and nucleoside cyclic phosphates by oxidation-reduction condensationTeruaki Mukaiyama and Mitsunori HashimotoCite this: J. Am. Chem. Soc. 1972, 94, 24, 8528–8532Publication Date (Print):November 1, 1972Publication History Published online1 May…
The calculation of amplitudes and phases of beams of electrons diffracted from thin (≤ 100 nm) crystals of W4Nb26O77 is described. These diffraction data are used to compute 11-beam 00l electron microscope lattice images and the effects of instrument aberrations are considered. Several approximations are compared with…
The collisional deactivation of O(1S) by CO2, O2, N2, and Ar has been investigated as a function of temperature in the range from 200 to 450°K. O(1S) was produced in a pulsed mode by vacuum ultraviolet flash photolysis of CO2. The decay of O(1S) was observed by the 5577 Å emission as a function of time after the produ…
Multiorganometallic compounds were used to prepare high‐purity submicron‐size lead lanthanum zirconate‐titanate (PLZT) powders which can be consolidated at low sintering temperatures to high‐density piezoelectric and electrooptic ceramic bodies. Simultaneous hydrolytic decomposition of lead isoamyloxide, lanthanum iso…
Measurements have been made of electron backscattering in a range of incident beam energy from 0·5 to 10 keV. The variation of backscattering coefficient η with energy and angle of incidence, and the energy spectrum of backscattered electrons at incidence and take-off angles of 45°, have been measured. Results from ca…