Materials Literature
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It is widely recognized that electron tube failures may be classified into two types: sudden and delayed. A mixture of two Weibull distributions, each representing one type of tube failure, is proposed, and a simple graphical method for estimating the parameters of the mixed Weibull distribution described.
Abstract The phenomenon of ferroelectricity in pseudo-cubic crystals is discussed in terms of the normal modes of vibration. It is shown that the parameters which determine the lattice vibrations of a diatomic ionic crystal may be chosen in such a way that the crystal will exhibit ferroelectric properties, and that fe…
We have derived, by using simple considerations, a relation between the diffusion constant D in a liquid of hard spheres and the ``free volume'' vf. This derivation is based on the concept that statistical redistribution of the free volume occasionally opens up voids large enough for diffusive displacement. The relati…
The fuel element cans of most of the current gascooled graphite- moderated reactors are not bonded to the uranium fuel. Good contact between can and fuel is ensured by a pressurizing operation during the canning process. The temperature drop at the interface will be small compared to the can-to-gas temperature drop, b…
X-ray topographs of a new type have revealed fine fringes in the diffraction images of wedge-shaped parts of perfect and nearly perfect crystals. The fringes are analogous to those seen in electron microscope images of wedge-shaped parts of magnesium oxide crystals and can be interpreted according to the theory applic…
This test method has been described in an earlier publication; it has been adopted in the United Kingdom as Method 102-D of British Standard 2782 (1956) and in the United States by ASTM. One advantage of the Vicat softening point (VSP) test is that it can be carried out on small specimens. It was therefore of interest…
George C. West; Effects of High Air Temperature on the Bill and Claw Keratin Structures of the Tree Sparrow, The Auk, Volume 76, Issue 4, 1 October 1959, Pages
Abstract The chemical reactions of polymers promoted by mechanical energy are surveyed. Evidence is reviewed in support of a mechanico‐degradation of polymers subjected to shear and of scission occurring in the central sections of the longer polymer molecules. The action of oxygen, “peptisers” for rubber degradation,…
The intrinsic viscosity of a polymeric substance crosslinked as well as degraded by irradiation with high-energy radiations is discussed for various types of initial molecular size distributions. The intrinsic viscosity as a function of radiation dose is shown to behave in a great variety of ways depending on the rela…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Kinetics of Oxidation of HBrWillis A. Rosser Jr. and Henry WiseCite this: J. Phys. Chem. 1959, 63, 10, 1753–1755Publication Date (Print):October 1, 1959Publication History Published online1 May 2002Published inissue 1 October 1959https://pubs.acs.org/doi/10.1021/j150580a…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Schlieren techniques have been used to study the effects of ultrasonic waves on concentration gradients produced by electrochemical methods. With standing waves at intensities below cavitation levels, the zones of depleted electrolyte at the cathode stratify at the displacement nodes of the standing waves while the zo…
The self-diffusion of nickel has been studied in polycrystalline samples by a sectioning technique. There is evidence of grain boundary diffusion below temperatures of 1150 °C. The results obtained between 1150° and 1400 °C are representative of volume diffusion and are represented by the expression[Formula: see text]…
An experimental survey of additives to barium titanate shows that in addition to those which are readily soluble in the barium titanate lattice (class 1) and those which are insoluble (class 2) two other distinct classes of additive, with limited solid solubility (classes 3 and 4), can be distinguished. Class 3 additi…
Density measurements have been made on vacuum-deposited copper films in the thickness ranges 50 to 150 A and 500 to 1000 A. To obtain the density, an analysis was made of the relation between the reflection coefficient and the glancing angle of incidence for 1.54 A x-rays. For films in the range 500 to 100 A, this ana…
(Received for publication, May 11, 1959) The occurrence of N-acetyl+aspartic acid in mammalian and avian brain at concentrations from 80 to 120 mg per 100 g fresh weight of tissue was demonstrated recently by Tallan et al. (1). The pattern of distribution of acetylaspartic acid in bovine brain was found by Tallan (2)…
The theory of the rate of approach to the steady state in themal diffusion is tested experimentally on the systems He-Ar, He-CO2, H2-CO2, and D2-CO2 over a temperature range of about -78°c to 325°c. The course of the diffusion has been followed by means of the radioactive tracers 37Ar and 14CO2. The theory appears to…
Abstract Theoretical calculations indicate that the melting point of a linear polyethylene should be experimentally determinable within 0.1°C., that of a low density polyethylene within 1°C., that of a 80/20 copolyester within 2°C. copolyester within 2°C. and that of a 60/40 copolyester within 5°C. Heats of fusion of…
Describes a simple screening test similar to copper ion displacement test which has been devised to screen corrosion inhibitors to be used in the inhibitor squeeze process. This copper ion test evaluates durability of protective inhibitor films formed by relatively high inhibitor concentrations rather than the usual t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Curing System on Rubber Oxidation and Physical Degradation.E. T. McDonel and J. R. SheltonCite this: J. Chem. Eng. Data 1959, 4, 4, 360–366Publication Date (Print):October 1, 1959Publication History Published online1 May 2002Published inissue 1 October 1959https://…