Materials Literature
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Abstract The effect of titanium compounds on thermooxidation stability of stabilized polypropylene was studied. It was found that the presence of titanium compounds shortens the induction period of PP oxidation. This phenomenon is brought about by the thermal reactions of titanium compounds with antioxidants which tak…
Surface elastic waves have been generated at 60 MHz by magnetostrictive coupling in yttrium iron garnet (YIG). The transducers were evaporated aluminum meander lines. For a YIG plate with the (110) axis normal to the free surface and propagation along the (001) axis, maximum coupling occurred for the static field para…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsothermal diffusion in some two- and three-component systems in terms of velocity correlation functionsD. C. Douglass and H. L. FrischCite this: J. Phys. Chem. 1969, 73, 9, 3039–3047Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Publ…
A polymer crystal with a noncrystalline surface layer formed by chain loops of different lengths is considered. It is assumed that the length of each loop can be changed by longitudinal diffusion of the molecule through the crystal lattice. From the condition that the free energy of the system is minimum, the loop len…
The behavior of stable cylindrical domains, under variations in temperature, has been studied in a number of the rare-earth orthoferrites from the point of view of the need for temperature control when these materials are used in propagating domain devices. Fractional changes in domain diameter from -0.60 percent/°K i…
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…