Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Recent experiments have indicated that the diffusion properties of a penetrant‐polymer system may change with time as diffusion proceeds. It is thought that two possible explanations of these time effects are slow changes of polymer structure accompanying diffusion and internal stresses exerted by one part of…
The average coefficients of thermal expansion of hexagonal zirconium between 298°K and 1143°K are 5.5×10−6 deg−1 along the a axis, 10.8×10−6 deg−1 along the c axis, and 7.2×10−6 deg−1 for a randomly oriented polycrystalline sample. The average value of the linear coefficient of expansion of cubic zirconium between 114…
It is known that the Curie point $\ensuremath{\theta}$ of the ferroelectric BaTi${\mathrm{O}}_{3}$ shifts to higher temperatures when a dc bias field is applied. If the crystal shows a sharp transition, we expect by applying an ac field at the Curie temperature that the crystal would become alternately ferroelectric a…
Summary Substitutional solute atoms in aluminium usually diffuse too slowly to cause appreciable strain ageing at room temperature. However, if the concentration of vacancies is increased by plastic deformation or by quenching, the rate of diffusion may increase sufficiently to cause strain ageing during plastic defor…
In the process of developing an atomic beam light source for use at high oven temperatures an investigation of the indium resonance lines at 4511A and 4101A was carried out. The employment of a well-collimated atomic beam, excited by electron impact, and of a Fabry-Perot interferometer made it possible to resolve clea…
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…