Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrin Studies. V.1 The Metal Complex Salts of α,β,γ,δ-TetraphenylporphinePaul Rothemund and Amel R. MenottiCite this: J. Am. Chem. Soc. 1948, 70, 5, 1808–1812Publication Date (Print):May 1, 1948Publication History Published online1 May 2002Published inissue 1 May 1948htt…
It is shown that the application of Schwarz's and Cauchy's Inequalities to the formulas for calculating Fhkl from, respectively, the density of scattering matter and the atomic positions in a crystal leads to relations between the magnitudes of some Fhkl's and the signs or phases of others. These relations are in the…
A quantitative investigation of the intensity of scattered radiation in a series of native and regenerated cellulosic objects, including bacterial cellulose and fibers transformed into cellulose IV, is offered. The technique used involves the use of copper radiation monochromatized by reflection, specimens with random…
Abstract The variation of plastic deformation in aluminium specimens consisting of large crystals has been determined by measuring elongation and hardness at various points after tensile deformation. The deformation varied from grain to grain, and also within each grain the deformation near the boundary was greater or…
Abstract General analysis is developed for certain three-dimensional stress distributions in a plane plate of infinite extent but of finite thickness which contains a circular cylindrical hole, the faces of the plate being free from applied stress. The analysis is used to solve the problem of a plate under uniform ten…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduction of Hydrogen and Synthesis Gas by Oxygen Gasification of Solid FuelC. C. Wright, K. M. Barclay, and R. F. MitchellCite this: Ind. Eng. Chem. 1948, 40, 4, 592–600Publication Date (Print):April 1, 1948Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics, Mechanism, and Activation Energy of the Cobaltous Ion Catalyzed Decomposition of Ozone1George Richard HillCite this: J. Am. Chem. Soc. 1948, 70, 4, 1306–1307Publication Date (Print):April 1, 1948Publication History Published online1 May 2002Published inissue 1 Apri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen in Production of Hydrogen or Synthesis GasL. L. NewmanCite this: Ind. Eng. Chem. 1948, 40, 4, 559–582Publication Date (Print):April 1, 1948Publication History Published online1 May 2002Published inissue 1 April 1948https://pubs.acs.org/doi/10.1021/ie50460a004https://d…
Abstract The action of methyl alcohol on pyridine in the vapour phase in contact with alumina or aluminium silicates gives methylpyridines, including the commercially valuable β‐picoline. The separation of this base from the other homologues of similar boiling‐point can be effected by taking advantage of the fact that…
Much progress in the understanding of the mechanical properties of high polymeric substances has been made in the past few years. The theory of the mechanical properties of rubberlike systems has been developed by Guth, James, Gee, Treloar, and others; those of fiberlike materials have been studied by Mark, Harris, Ey…
A simple and accurate method of determining pole figures by using a special sample mount with a Geiger counter x-ray diffraction goniometer is described and examples given. Also, a correction formula is derived which takes into account absorption change and change in diffracting volume as the sample changes position w…
A bstract The current theories of glass formation deal mainly with inorganic substances containing oxygen as the negatively charged component. A distinction has been made between those positively charged components which are considered as essential for the formation of the continuous network and those which fit into t…
Abstract Poly‐4‐vinylpyridine was precipitated from a toluene solution of the monomer after addition of benzoyl Peroxide. The sample used in these experiments had a molecular weight of 77,000, (DP 730) as determined by osmotic pressure in alcohol solution, and an intrinsic viscosity of 0.36 in this solvent. The hydroc…
Abstract The absorption spectra of some crystalline and oriented solids have been measured using planepolarized infra-red radiation. The sample was examined successively with the direction of orientation of the crystals parallel or perpendicular to the direction of vibration of the electric vector in the polarized inc…
It is pointed out that Peierls' condition for the validity of time-dependent perturbation theory in the determination of the mobility $\ensuremath{\mu}$ of electrons in crystals can be transformed to the form $\ensuremath{\mu}>30 \frac{{\mathrm{cm}}^{2}}{\mathrm{v}\mathrm{o}\mathrm{l}\mathrm{t}\ensuremath{-}\mathrm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Epoxy Compounds. VI.2 Thermal Polymerization of the Isomeric 9,10-Epoxystearic Acids1aDaniel Swern, Geraldine N. Billen, and C. Roland EddyCite this: J. Am. Chem. Soc. 1948, 70, 3, 1228–1235Publication Date (Print):March 1, 1948Publication History Published onli…
Kalsilite, the simplest of the three known polymorphous forms of KAlSiO4, was isolated in minute quantities from volcanic rocks of S.W. Uganda in 1942 (Bannister & Hey, 1942) and synthesized in the laboratory for the first time in 1947 (Rigby & Richardson, 1947).
Abstract An analytical method is developed for determining the natural frequencies of a composite system which consists of a uniform beam with a concentrated mass, spring, and dashpot attached at any point along the length of the beam. The method makes use of a series expansion in terms of the set of orthogonal functi…
Abstract 1. Das System NaCl/MgCl 2 wird nachgeprüft und die Zusammensetzung der Verbindungen als NaMgCl 3 und Na 2 MgCl 4 sichergestellt. 2. Das System KCl/MgCl 2 wird thermoanalytisch und röntgenographisch untersucht; es treten die kongruent schmelzenden Verbindungen KMgCl 2 und K 2 MgCl 4 auf. 3. Eine vorläufige Unt…
Several commercial carbon blacks were examined with dark-field illumination in the electron microscope. Anomalous intensities in the dark-field images are interpreted as resulting from coherent scattering by parallel layer groups of graphitic planes, which were previously identified by Biscoe and Warren using x-ray di…