Materials Literature
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Abstract The amount of energy stored in a cold-worked material is calculated on the assumption that the energy is due to piled-up groups of dislocations. It is found that a small percentage of the work done in deformation is stored, and that the amount of energy stored is proportional to the strain. These predictions…
Abstract Calculations from published figures of the equilibrium constants for the decomposition 2HNO 3 H 2 O + 2NO 2 + 1/2O 2 show that the degree of dissociation of nitric acid vapour is quite considerable even at moderate temperatures and reaches 100% at 200° and 1 atmosphere pressure. The rate of dissociation has b…
An integral expression for the electrical conductivity of thin films in a longitudinal magnetic field is derived by an analysis of free electron trajectories in the film. This is evaluated in the limit of strong magnetic fields.
In transducer applications of ferroelectric ceramics it is standard practice to rely for the electromechanical response on retained polarization. This is practicable only for moderate driving amplitudes and sufficiently low temperature. At higher driving fields dielectric losses increase inordinately and lead to event…
The results of a brief study of the origin and mode of formation of high resistance films on electrodes of demountable systems are presented. Evidence is given that the films are produced by the dissociation of organic molecules into radicals by electron bombardment and the polymerization of the latter. It is shown th…
The application of the kinetic theory of rubber elasticity to the description of the relaxation of cross-linked networks is only permissible in cases where the rate determining process is slow compared to the rate of diffusion of the polymer chains. Relaxation resulting from chemical reactions causing breaking of netw…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxides of the Transition Metals as CatalystsAlfred ClarkCite this: Ind. Eng. Chem. 1953, 45, 7, 1476–1480Publication Date (Print):July 1, 1953Publication History Published online1 May 2002Published inissue 1 July 1953https://pubs.acs.org/doi/10.1021/ie50523a034https://doi.or…
A review of the present state of knowledge of the variation with temperature of the thermal expansion of anisotropic metals. The theoretical significance of the experimental data is discussed.DOI:https://doi.org/10.1103/RevModPhys.25.665©1953 American Physical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Solid Solution Series, Boron-Boron Carbide1Robert D. AllenCite this: J. Am. Chem. Soc. 1953, 75, 14, 3582–3583Publication Date (Print):July 1, 1953Publication History Published online1 May 2002Published inissue 1 July 1953https://pubs.acs.org/doi/10.1021/ja01110a501https…
Experimental investigations of the Hall effects in cobalt, the cobalt-nickel alloys, and Armco iron are described in detail. Precision measurements were made with magnetic fields up to 30 kilogauss in order to separate the ordinary and extraordinary effects. The ordinary effect in all the Co-Ni alloys was found to be…
DEVELOPMENTAL DYNAMICS provides a focus for communication among developmental biologists who study the progressive and dynamic emergence of form and function during embryonic development. The journal is an international forum for the exchange of novel and substantive information on mechanisms that control development.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of Esters of Cinnamic Acid1C. S. Marvel and G. H. McCainCite this: J. Am. Chem. Soc. 1953, 75, 13, 3272–3273Publication Date (Print):July 1, 1953Publication History Published online1 May 2002Published inissue 1 July 1953https://pubs.acs.org/doi/10.1021/ja01109…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWetting of Fluorinated Solids by Hydrogen-Bonding LiquidsA. H. Ellison, H. W. Fox, and W. A. ZismanCite this: J. Phys. Chem. 1953, 57, 7, 622–627Publication Date (Print):July 1, 1953Publication History Published online1 May 2002Published inissue 1 July 1953https://pubs.acs.o…
A 2.5-Mc, barium-titanate, spherically focusing radiator was used to produce cavitation in both degassed and aerated water entirely within the restricted, high intensity focal region, remote from the water boundaries. The sonic intensity rises to 1.8 kw/cm2, and the pressure amplitude to ±70 atmos at the focus. High-i…
Abstract A series of polyethylene resins made by making progressive changes in temperature, pressure, and catalyst content has been studied by infrared absorption spectroscopy. From the methyl content and the number‐averages molecular weight of each resin, it was found that as molecular weight increases degree of bran…
An extensive survey is made of the chemical effects of ultrasonic waves. Increased understanding of the mechanism of these effects is sought through a consideration of the significance of certain experimental variables such as frequency, intensity, pressure, and temperature. Also considered is the role of cavitation.
The hydrated stannates of barium, calcium, strontium, magnesium, bismuth, lead, cobalt, nickel, zinc, copper, cadmium, iron, and manganese were prepared and their thermal behavior was studied by differential thermal analyses coupled with X‐ray diffraction patterns of calcines. Ceramic bodies were prepared from each of…
The general expression for the second-order angular aberration of sector shaped electromagnetic lenses consisting of superimposed uniform magnetic and radial electric fields used for the plane focusing of diverging beams of charged particles is derived. The result is applied to the special cases of pure magnetic and p…
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El autor después de estudiar durante varios años, en el Laboratorio de Investigaciones Tecnológicas de la provincia de Mendoza, las rocas volcánicas argentinas, bajo el punto de vista de su posible utilización como puzolanas, ha redactado un extenso trabajo, cuyo original se publicará en la revista argentina "Técnica…