Materials Literature
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Phosphorescence and thermoluminescence emission from photoconducting impurity activated phosphors have been satisfactorily explained by the storage of electrons, freed from luminescence centres or other atoms of the solid, in metastable energy levels known as electron traps. Electrons escaping from these traps give ri…
Abstract The Becker-Kersten treatment of domain boundary movements is widely applicable in the interpretation of magnetization curves, but it does not account satisfactorily for the higher coercivities obtained, for example, in permanent magnet alloys. It is suggested that in many ferromagnetic materials there may occ…
SUMMARY: Equipment can be readily made in the laboratory for the mechanical preparation of roll-tubes. Roll-tubes so prepared can largely replace Petri dishes both for counting and for single colony isolations.
A summary is given of the theory of pulsation of a stationary gas globe in an infinite incompressible fluid. If three parameters appearing in the formulation are selected by fitting the equations to three independent experimental results, it is shown that the theory fits the remaining experimental results and can be u…
The various shapes of nuclear induction signals are discussed for small values of the r-f field. In the case of a linear variation with time of the strong magnetic field, numerical results are given for various values of the sweep rate and the total relaxation time.
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…