Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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,…
Abstract Amputated hyperinnervated Anolis carolinensis limbs were studied histologically at various times from early stages of post‐amputational wound healing to formation of mature mounds. Comparable stages of normally innervated amputated limbs were also studied. The sequence of events involved in tissue repair was…
Abstract Diffusion of sulfur and MBTS across interfaces between dissimilar rubbers has been measured by microinterferometry. This technique involves the comparison of optical path length through refractive index gradients, due to diffusion, against that of a reference area. Differential diffusion coefficients are obta…
The Young's and shear moduli of polycrystalline yttrium oxide, holmium oxide, and erbium oxide were determined from room temperature to 1000°C using the sonic resonance technique. The bulk modulus and Poisson's ratio were computed as functions of temperature for each oxide. The Young's, shear, and bulk moduli decrease…
A greater percentage of mesquite seeds germinated and more vigorous seedlings were produced at a simulated soil temperature of 85 F than at 70 or 100 F. Alternating the temperature between 68 (16 hr) and 86 F (8 hr) did not increase the percentage germination as compared to constant 85 F. As temperature increased mois…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorinated iron phthalocyanineJohn Gareth Jones and M. V. TwiggCite this: Inorg. Chem. 1969, 8, 9, 2018–2019Publication Date (Print):September 1, 1969Publication History Published online1 May 2002Published inissue 1 September 1969https://pubs.acs.org/doi/10.1021/ic50079a045…
The freshwater ostracode Candona rawsoni Tressler can survive in a torpid state. The time required for rejuvenation of the torpid ostracode depends upon the temperature of the water and the soil-moisture content.
K2WO4 crystallizes in space group C2/m with the axes a 12.39, b 6.105, c 7.560 A., and b 115.96 Deg. The 4 formula units per unit cell form layers parallel to (001), in which each WO4 tetrahedron is surrounded by an almost regular hexagon of K ions. The W-O bond length is 1.79 A., and the K-O and O-O distances are in…
Optical activity has been observed for the first time in a crystal of the non-enantiomorphous class \bar 4 CdGa2S4 is optically isotropic at 4872 Å (20°C) and this allows observation of optical rotation for propagation in directions away from the c axis. The magnitude of the optical rotatory power is 17.3 deg.mm−1 alo…