Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of metathesis and epoxidation in chromium and molybdenum complexes containing methyl-oxo bondsAnthony K. Rappe and William A. Goddard IIICite this: J. Am. Chem. Soc. 1980, 102, 15, 5114–5115Publication Date (Print):July 1, 1980Publication History Published online1…
Growth of films and scales on was investigated in oxygen at 1 atm over the temperature range 1273°–1573°K. An initial sub‐microcrystalline oxide film recrystallized during its growth to a textured film containing polycrystalline ridges. Inert marker measurements demonstrated that the initial film grew by inward diffus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of coordinated carbon monoxide toward alkyl and aryl migration (carbon monoxide insertion) by molecular Lewis acids and x-ray structure of the reactive intermediateSusan Beda Butts, Steven H. Strauss, Elizabeth M. Holt, Rebecca E. Stimson, Nathaniel W. Alcock, and…
Dielectric susceptibilities are reported for $\mathrm{K}{\mathrm{Ta}}_{1\ensuremath{-}x}{\mathrm{Nb}}_{x}{\mathrm{O}}_{3}$ and ${\mathrm{K}}_{1\ensuremath{-}y}{\mathrm{Na}}_{y}\mathrm{Ta}{\mathrm{O}}_{3}$ mixed-crystal ferroelectrics with a Curie temperature ${T}_{C}$ close to absolute zero. According to the temperatu…
Matrix protein, a pore-forming transmembrane protein spanning the outer membrane of Escherichia coli, has been obtained in a variety of three-dimensional crystal forms amenable to both electron microscope and x-ray analyses. Successful association into large crystals depended on the use of alpha-octyl glucoside, a det…
electron microscopy. They were assigned to the genus Amphora Ehr. ex Kutz., although previous investigators had most often treated the diatom as Cymbella parvula Krasske or Cymbella thumensis (Mayer) Hust. Characteristics influencing the genus assignment include differential mantle development, multiple intercalary ba…
Abstract The connection between intrinsic viscosity and number‐average and weight‐average molecular weight has been revealed by calculations from distribution curves. Log‐normal distributions, and moderate variations thereon, were chosen as typical for polystyrene and other thermoplastics. Intrinsic viscosity and numb…
Mixtures of MnO and graphite were reacted under argon at temperatures ranging from 1200 to 1425i?½C, and the loss in mass of the mixture was recorded continuously. The results showed that the rate of reduction of MnO increased as the temperature increased and the ratio of MnO to C decreased. The effect of the particle…
Abstract Since the discovery by Goodyear in 1839 that the physical properties of rubber may be improved with sulfur, it has been the most commonly used crosslinking agent. The rubber industry is concerned with the production of homogeneous products with appropriate physical properties, by compounding rubber with ingre…
1. The incisor position should be evaluated in relation to the sagittal and vertical configurations of the face, as well as to the shape of the bony chin. 2. A floating norm for the positioning of the lower incisors is established based upon the guiding variables ANB, ML-NL and the N angle with the introduction of a m…
Abstract Durch Fällungsreaktion aus Natriumsilicatlösungen mit Calciumsalzen entstehen bei 0°C schlecht geordnete Calciumhydrogensilicate, deren Anionenaufbau primär dem des Natriumsilicates in der Lösung entspricht. Sie sind aber nicht stabil und werden in der Mutterlauge bei 0°C in Disilicat mit einer Zusammensetzun…
A method is presented for estimating the number of domain walls in grain-oriented 3% Si-Fe tape wound cores under sinusoidal flux conditions by extending the method developed in a study of the dynamic behavior of 50% Ni-Fe square-loop cores. The results show that the number of domain walls increases approximately with…
Abstract An attempt has been made to review the development of thermoanalytical procedures as they have been applied to elastomers and elastomer systems over the past 10 years. For all rubber industry products, temperature and its effects, either alone or in conjunction with the chemical environment, play an important…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state structure and electronic properties of a mixed-valence two-dimensional metal, potassium copper sulfide (KCu4S3)David B. Brown, Jon A. Zubieta, P. A. Vella, James T. Wrobleski, Timothy Watt, William E. Hatfield, and Peter DayCite this: Inorg. Chem. 1980, 19, 7, 19…
Abstract The results of the present study are consistent with the hypothesis that gunshot residue is formed by the condensation of vaporized bullet and primer materials that segregate into metallic and compound particles. Some of the metallic vapors are oxidized and “scavenged” by oxygen and sulfur-rich primer compoun…
The optical properties of polyethylene, obtained from transmission measurements on thin films, are presented for photon energies from 0.5 to 76 eV. The results for the extinction coefficient are combined with calculated values in the soft and hard X-ray regions, and both their internal consistency and their consistenc…
Glasses containing Al2O3, Ga2O3, and Bi2O3 with Li2O have been prepared by twin roller quenching. These glasses are found to exhibit reasonably high ionic conductivities and low electronic conductivities for Li2O concentrations exceeding 50 mole %. The conductivity increases rapidly with increasing Li2O content but do…
A nematic liquid crystal, pentyl-cyano-biphenyl (5CB) is studied in two different flow situations: Poiseuille flow and torsional shear flow, in both cases with and without the simultaneous application of an electric field. The Poiseuille flow set-up gives an accurate determination of the Miesowicz viscosity ηc and a l…
Abstract The thermal properties of poly(ethylene terephthalate) (PET) are sensitively affected by polycondensation catalysts and temperature. The kinetics of thermal degradation were investigated by determining the rates of formation of carboxyl groups on isothermal heating. Carboxyl groups in PET were not only a resu…
Adsorption of bovine albumin, gamma-globulin and fibrinogen from phosphate buffer solution (pH = 7.5) onto several polymer films was studied using the radioiodinated proteins (125I). The kinetics of desorption of the proteinated polymer films in bovine plasma was determined. Contact angle measurements on these same po…