Materials Literature
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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://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCounterion Binding by Polyelectrolytes. IV. Membrane Equilibrium Studies of the Binding of Univalent Cations by Long-chain Polyphosphates1Ulrich P. Strauss and Philip D. RossCite this: J. Am. Chem. Soc. 1959, 81, 20, 5299–5302Publication Date (Print):October 1, 1959Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Chemical Thermodynamic Properties of Calcium HydroxideW. E. Hatton, D. L. Hildenbrand, G. C. Sinke, and D. R. StullCite this: J. Am. Chem. Soc. 1959, 81, 19, 5028–5030Publication Date (Print):October 1, 1959Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Deuterium on the Strength of Hydrogen Bonds1Melvin Calvin, Jan Hermans Jr., and Harold A. ScheragaCite this: J. Am. Chem. Soc. 1959, 81, 19, 5048–5050Publication Date (Print):October 1, 1959Publication History Published online1 May 2002Published inissue 1 October 1…
According to the molecular theory of rubber elasticity, the stress τ is related to the relative length α in simple extension according to τ=kT(ν/V)<α>2(α−1/α2), where (ν/V)<α>2 is a parameter of the network structure. Improved agreement with experiment has been claimed through use of the re…
Controlled dendritic growth of germanium from the melt yields long thin strips whose principal surfaces are optically flat {111} crystallographic planes except for the occasional presence of small steps. The crystals grow rapidly in the $〈211〉$ direction, have twin planes parallel to the flat surfaces, and can withsta…
The origin of the large tetragonal distortions which occur in a number of transition metal oxides having the spinel structure has been examined recently by Dunitz and Orgel in terms of the crystal field theory. According to these authors the macroscopic distortions arise as a consequence of a Jahn-Teller type distorti…