Materials Literature
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The fracture toughness of A533 steel at room temperature, 0 deg and −70 deg F, was evaluated with 1 and 2-in-thick contoured double cantilever beam (DCB) specimens. To establish the effect of rate on thickness requirements, and to assess the strain rate sensitivity of KIc both initiation and arrest toughnesses were me…
Abstract The influences of conditioning treatments and surface topography on the heparin adsorptivity and the thromboresistance of a high‐strength, impermeable, isotropic, pyrolytic carbon were investigated. The results of the adsorption studies indicate that the adsorption of heparin on such carbon surfaces is near t…
The recoveries of activity in the presence of mixtures of several enzymes and a cellular debris were compared with the recoveries of the pure enzymes. In the acid-dissociation experiments, no interference from foreign proteins was observed nor were any cross hybrids between subunits of different enzymes found. This su…
Abstract Incongruent dissolution of aragonite and magnesium calcite
Both semiconductors and magnetic materials exhibit interesting properties that can be used in electronic devices. A material that combines these properties, i.e., a magnetic semiconductor, could show interesting cross effects, such as a large magnetoresistance, or hysteresis and the associated memory phenomena introdu…
Polycrystalline aluminum oxide was hot‐worked at 1750° to 1950°C and at stresses <21, 000 psi using a press‐forging technique. No ductility problems were encountered, and maximum true strains and strain rates of ‐1.25 and 0.2/min, respectively, were observed. Deformed samples often showed grain elongation in additi…
Abstract The adsorption of nitrate in an amorphous Akaka silty clay and kaolinitic Wahiawa silty clay increased consistently with increasing concentration and decreasing pH of the electrolyte solution. The magnitude of adsorption was higher in the Akaka than in the Wahiawa soil. The amount of adsorbed nitrate was nota…
Zur Klärung der Frage, inwieweit die Gitterschwingungen der Spinelle bestimmten Koordinationspolyedern oder der gesamten Elementarzelle zuzuordnen sind, wurden die Zahl, der Schwingungstyp und die Symmetriekoordinaten der Schwingungen aus der Faktorgruppe des idealisierten Spinellgitters (Raumgruppe F4 1 /d3̄̅2/m) abg…
Summary The abilities of 10 trioctahedral and 3 dioctahedral micas to release K by cation exchange were compared by repeatedly extracting the micas with NaCl solutions. For a chosen solution concentration and pH, the quasi‐equilibrium concentration of K in a solution in contact with a mica is largely independent of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface tension of polymer solutions. I. Solutions of poly(dimethylsiloxanes)George L. Gaines Jr.Cite this: J. Phys. Chem. 1969, 73, 9, 3143–3150Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Published inissue 1 September 1969https://…
A four-fold classification of the current-controlled instabilities in amorphous semiconductors is proposed. The experimental evidence supporting a simple band model for the amorphous covalent alloys is given. The present understanding of the reversible switching effects and of the switching with memory is discussed.
Abstract The mechanism of solid state polycondensation has been subjected to a fundamental analysis. Equations were formulated for combined diffusion and chemical reaction for two separate situations. One was for solid state polycondensation in polymer flakes or chips. The other dealt with polymer powders. The resulta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRing-current effect of the phthalocyanine ringThomas R. Janson, Alexander R. Kane, John Francis Sullivan, Kerro Knox, and Malcolm E. KenneyCite this: J. Am. Chem. Soc. 1969, 91, 19, 5210–5214Publication Date (Print):September 1, 1969Publication History Published online1 May…
A brief review is given of mechanical property measurements on oxide films. This review is followed by a detailed discussion of the mechanical and fracture properties of anodic aluminum oxide films as observed in the author's laboratory. Extensive measurement of Young's modulus, <mml:math xmlns:mml="http://www.w3.org/…
Considerable interest has been centered around rare-earth-cobalt magnets during recent years. For the last two years we have been carrying out a research program in the general area of rare-earth-cobalt magnets. At this time, we have successfully developed a rare-earth-cobalt magnet with close to the attainable limit…
A brief account is given of the theory of the vibrations of an imperfect crystal containing isolated impurities and pairs of impurities, and the strength of the induced infra-red absorption is discussed. An analysis is then made, by the methods of group theory, of the energy levels and expected optical transitions of…
Abstract The scattering patterns are calculated from anisotropic rods having an arbitrary angle of the polarizability axis with respect to the rod axis. The effect of a distribution of orientation of the rods is explored. This leads to a change in scattering patterns produced by orienting the rods upon stretching the…
Earlier work showed that some low-field magnetic properties of high-permeability Ni-Fe alloys containing about 80-percent Ni could be explained by considering the effect of the filling of the 3d vacancies of the Ni atoms by the outermost electrons of an added nonferromagnetic element. This work is extended to show how…
Single crystals of CdF2, doped with Eu3+, were grown by the Bridgman method, and shown by fluorescence and absorption spectra to contain no detectable Eu2+, irrespective of the presence of Na+ or Y3+ as added impurities. Ultraviolet irradiation at 77°K produced a new broad absorption band near 3400 Å, which disappeare…
Abstract The wavelength dependence of photodegradation of three “high temperature” aromatic polyamide polymers has been very accurately determined by means of a fast grating spectrograph used in conjunction with a high pressure xenon arc. One of these polymers, the poly‐(isophthalamide) of 4,4′‐bis( p ‐aminophenyl)‐2,…