Materials Literature
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Abstract A simple method is described for the quantitative analysis of urinary δ-aminolevulinic acid. 2-Methyl3-carbethoxy-4-(3-propionic acid) pyrrole, produced by the condensation of δ-aminolevulinic acid with ethyl acetoacetate, is almost completely extracted from an aqueous solution with ethyl acetate without reso…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis in molten salt mediaGeorge W. ParshallCite this: J. Am. Chem. Soc. 1972, 94, 25, 8716–8719Publication Date (Print):December 1, 1972Publication History Published online1 May 2002Published inissue 1 December 1972https://pubs.acs.org/doi/10.1021/ja00780a013https://doi…
Abstract The spherulite growth rate, the maximum spherulite radius, and the overall rate of crystallization of poly(ethylene terephthalate) (PETP) were measured by means of scattering and transmission of depolarized light. The influence of crystallization temperature, molecular weight, and additives on the above‐menti…
We determined the variation of the Curie temperature with pressure for iron, cobalt, nickel, six iron-nickel alloys, and five cobalt-nickel alloys. A permeability method in zero magnetic field has been used in a belt-type apparatus at pressures up to 90 kbar and temperatures up to 1400 \ifmmode^\circ\else\textdegree\f…
The experimental 14N and 17O n.m.r, results in a series of lanthanide complexes are successfully interpreted from a second-order perturbation treatment of the calculation of (S2), where bonding effects and spin-orbit coupling mixing are incorporated. The isotropic hyperfine interaction constants are shown to be negati…
The problem of a nematic liquid crystal in an electric field is solved. Effects due to conductivity of the liquid have been neglected. Numerical solutions are given for various values of parameters. The solution is compared with experimental data taken from the literature. A computer program has been developed to do a…
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PRINCIPAL CAUSES OF CRACKING AND RECOMMENDED CRACK CONTROL PROVISIONS ARE PRESENTED IN THIS REPORT. IT COVERS THE BASIC MECHANISM OF MICROCRACKING AND FRACTURE MECHANICS IN CONCRETE. IT DEALS WITH CONTROL OF CRACKING DUE TO VARIOUS CAUSES IN THE FOLLOWING AREAS: SHRINKAGE, REINFORCED CONCRETE BEAMS, ONE-WAY AND TWO-WA…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange in transition metal complexes. IX. Dimeric nickel(II)-ethylenediamine complexesA. P. Ginsberg, R. L. Martin, R. W. Brookes, and R. C. SherwoodCite this: Inorg. Chem. 1972, 11, 12, 2884–2889Publication Date (Print):December 1, 1972Publication History Publish…
The uniaxial deformation of an elastic-plastic medium containing a doubly periodic square array of circular cylindrical voids is studied under plane-strain conditions. Both the effects of geometrical nonlinearities resulting from large deformation and physical nonlinearities arising from plastic material behavior are…
The refractive indices of the ternaryA^{I}B^{III}C_{2}^{VI}semiconductors CuAlSe2, AgGaSe2, CuGaSe2, and AgInSe2have been measured over most of the transparency range of these crystals. The optical nonlinear coefficients for second-harmonic generation of AgGaSe2CuGaSe2, and AgInSe2have also been measured. Three-freque…
A unified hydrodynamic theory is presented that is appropriate for crystals; smectic, cholesteric, and nematic liquid crystals; glasses; and normal fluids. In the theory, the increased spatial degeneracy as the system progresses from crystalline and mesomorphic phases to the isotropic fluid phase is marked by successi…
The present review considers experimental data and the results of theoretical studies of the dehydration of crystal hydrates. The data have been systematised according to the stages of the reaction in the light of modern theories of the kinetics and mechanism of chemical reactions in solids. Attention has been drawn t…