Materials Literature
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Abstract An experimental study is described of a “secondary” relaxation process in stretched vulcanizates, which becomes dominant after long periods at normal temperatures. It is shown to be affected markedly by the temperature, the atmosphere in which the test is conducted, and the presence of oxidation inhibitors. I…
The problem of the radiation embrittlement of structural steel and its relation to reactor pressure vessels is discussed. Clustered lattice defects produced by knock-on collisions from fast neutrons harden steel by a process analogous to precipitation hardening. It is shown that for the amount of hardening produced, t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE PHOTOCHEMICAL EVOLUTION OF HYDROGEN FROM AQUEOUS SOLUTIONS OF FERROUS IONS. PART I. THE REACTION MECHANISM AT LOW pHJoshua Jortner and Gabriel SteinCite this: J. Phys. Chem. 1962, 66, 7, 1258–1264Publication Date (Print):July 1, 1962Publication History Published online1…
Infrared absorption measurements have been made on $p$-type PbTe at wavelengths ranging from 4 to 28 \ensuremath{\mu} and at temperatures ranging from 300 to 77\ifmmode^\circ\else\textdegree\fi{}K. Absorption by three different mechanisms was observed. At short wavelengths, the dominant absorption is caused by transit…
Since triglycine sulphate crystal is centrosymmetric above the Curie point, the piezoelectricity in the ferroelectric phase is expected to be an “induced” one as in the case of barium titanate, distinct from an “intrinsic” piezoelectricity of rochelle salt. Temperature dependences of piezoelectric constants are measur…
Abstract The effect of periodate followed by sodium borate treatment on the stabilities of prewet soil aggregates has been determined by a permeability technique and by wetsieving. The effect of periodate treatment depends on the history of the site, the depth, and the great soil group from which the sample is taken.…
Abstract The dynamical properties of tire yarns were investigated, the De Mattia method being used for compression fatigue and the Meskat‐Rosenberg‐Hoffmann instrument for the performance during an alternating tensile strength test. Various influences in the test of compression fatigue after De Mattia were investigate…
Oxygen and hydrogen have detrimental effects on the ductility of columbium and tantalum, particularly at subzero temperatures. Tantalum has a lower tolerance for oxygen than does columbium; however, the ductility of columbium containing oxygen is more temperature-sensitive than tantalum. Fracture modes change from she…
Abstract Antioxidant efficiency versus structure was investigated using rate of carbonyl formation at 110 and 170°C of a 20 mil plaque of polyethylene containing 0.01 weight % additive. This study indicates that the following are important in phenolic and amine antioxidants: The number of H. atoms available: Antioxida…
Constitutional studies of three polysaccharides prepared from Serratia marcescens cells by a sequence of phenol extraction, ultracentrifugation, and fractionation by Cetavlon are described. Methylation of the polysaccharides followed by acid hydrolysis yielded 2,3,4,6-tetra-O-methyl-D-glucose, 2,4,6-tri-O-methyl-D-glu…
Eigenschaften der Neutronenstrahlen, Aufbau eines Neutronenspektrometers. Untersuchung der Struktur des Zementits Fe 3 C, des Wolframkarbids WC und der Chromkarbide Cr 3 C 2 und Cr 23 C 6 . Vergleich der Ergebnisse mit den aus dem Schrifttum bekannten.
The binary system CaO‐Nb 2 O 5 has been shown to include three compounds: CaO·Nb 2 O 5 , which melts congruently at 1560°C; 2CaO·Nb 2 O 5 , which melts congruently at 1576°C; and 3CaO·‐Nb 2 O 5 , which melts incongruently at 1560°C. Three eutectic compositions occur at 6% CaO (1362°C), 23% CaO (1492°C), and 34% CaO (1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPREPARATION, STRUCTURE, AND PROPERTIES OF K2NbO3FFrancis Galasso and Wilda DarbyCite this: J. Phys. Chem. 1962, 66, 7, 1318–1320Publication Date (Print):July 1, 1962Publication History Published online1 May 2002Published inissue 1 July 1962https://pubs.acs.org/doi/10.1021/j1…
Abstract Polytetrafluoroethylene was irradiated in air, in a vacuum, at elevated temperature, in a nitrogen atmosphere, and in some combinations of these conditions. In all cases the plastic was found to degrade in its structural characteristics. Even the most favorable condition of irradiation (irradiation in vacuo )…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN-Functionally Substituted PyrrolesA. D. Josey and E. L. JennerCite this: J. Org. Chem. 1962, 27, 7, 2466–2470Publication Date (Print):July 1, 1962Publication History Published online1 May 2002Published inissue 1 July 1962https://pubs.acs.org/doi/10.1021/jo01054a042https://d…
Abstract Clay fractions of soils which contain intergrades of chlorite‐expansible 2:1 layer silicates from three states were studied. The citrate, fluoride, and 400° and 500°C. dehyroxylation‐NaOH methods of removing the interlayer materials were compared. The latter method removed more interlayer material than either…
Paramagnetic measurements have been made on powder samples of VB, CrB, MnB, FeB, CoB and NiB either over the temperature range 150°K to 800°K or, in the case of those that are ferromagnetic, from the Curie point to 800°K. The data for the ferromagnetic borides are intended to supplement results obtained below the Curi…
Abstract : Directions are given for the fabrication, cleaning, and sterilizing of a modified CarlsonCrittenden parotid fluid collecting device that has been use-tested by the authors in the collection of over 40,000 specimens. It has served particularly well in prolonged collections made with exogenous stimulants. The…
The growth of pre-breakdown currents in uniform field conditions in sulphur hexafluoride at different pressures for values of E/p in the range of 90 to 160 v cm -1 mmHg -1 (5-200 mmHg pressure) indicates very large electron attachment. It is assumed that the mechanism of negative ion formation is due to dissociative a…
(1962). Neutron scattering studies of liquid diffusion. Advances in Physics: Vol. 11, No. 43, pp. 203-232.