Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of lanthanum on the surface structure and carbon monoxide hydrogenation activity of supported cobalt catalystsJeffrey S. Ledford, Marwan Houalla, Andrew Proctor, David M. Hercules, and Leonidas PetrakisCite this: J. Phys. Chem. 1989, 93, 18, 6770–6777Publication Da…
Slip casting is one of the most common forming techniques used in the fabrication of ceramics. To obtain successful casting results, one need first to fully deagglomerate the ceramic powders and get concentrated slurries with good rheological properties. In this work, the rheological properties of concentrated alumina…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature-heat diagrams for complex columns. 3. Underwood's method for the Petlyuk configurationNeil A. Carlberg and Arthur W. WesterbergCite this: Ind. Eng. Chem. Res. 1989, 28, 9, 1386–1397Publication Date (Print):September 1, 1989Publication History Published online1 Ma…
Dislocations and stacking faults have been observed for the first time in a decagonal quasicrystalline structure. The lattice defects found in the decagonal phase of A165Cu20Co15 give an electron diffraction contrast similar to that found in normal-crystalline materials.
High-quality zinc oxide (ZnO) films have been deposited by rf magnetron sputtering from a zinc oxide target. The material has been obtained with resistivities ranging from about 1 Ω cm to 4.6×10−4 Ω cm, whereas the average transmission was always greater than 90% between 400 and 800 nm. A relatively high deposition ra…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical polymerization of aniline and N-alkylanilinesAkira Watanabe, Kunio Mori, Atsushi Iwabuchi, Yasunori Iwasaki, Yoshiro Nakamura, and Osamu ItoCite this: Macromolecules 1989, 22, 9, 3521–3525Publication Date (Print):September 1, 1989Publication History Published…
The structure of asymmetric [110] tilt boundaries developed during creep of pure aluminium single crystals is studied using high-resolution electron microscopy. The small- and moderate-misorientation boundaries are composed of Lomer and 60° dislocations. Extensive image simulation is used to deduce the detailed core s…
We examine the pattern of infall velocities induced by a rich cluster of galaxies. An infall model based on the Friedmann solution yields the exact implicit dependence of the peculiar velocity on the density enhancement {DELTA} and the mean cosmological mass density {OMEGA}_0_. The exact solution and an explicit expan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkene epoxidations catalyzed by iron(III), manganese(III), and chromium(III) porphyrins. Effects of metal and porphyrin substituents on selectivity and regiochemistry of epoxidationTeddy G. Traylor and Andrew R. MiksztalCite this: J. Am. Chem. Soc. 1989, 111, 19, 7443–7448P…
1. The effects of gamma-aminobutyric acid (GABA) on membrane potential and conductance as well as on the intracellular Cl- activity (aiCl) and intracellular pH (pHi) were studied in crayfish muscle fibres using a three-microelectrode voltage clamp and ion-selective microelectrodes. In the presence of CO2-HCO3-, the in…
Abstract The Powder Diffraction File (PDF) X-ray diffraction pattern for SnO 2 (cassiterite, syn), determined in the early 1950's at the National Bureau of Standards, was evaluated using the NBS*AIDS83 editorial review program and a calculated powder pattern. Systematic errors in d-spacings and relative intensities we…
Poly-beta-hydroxybutyrate/calcium polyphosphate (PHB-CaPolyPi) complexes exist as labile quasi-crystalline structures in bacterial plasma membranes. The composition, structure, and distribution of the complex suggest it may play a role in the regulation of intracellular calcium and in calcium signaling. The importance…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and chemical properties of the Dow perfluorosulfonate ionomersRobert B. Moore III and Charles R. MartinCite this: Macromolecules 1989, 22, 9, 3594–3599Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 Septe…
Coordination and local geometry around Si cations in silicate liquids are of primary importance in controlling the chemical and physical properties of magmas. Pressure-induced changes from fourfold to sixfold coordination of Si in silicate glass samples quenched from liquids has been detected with (29)Si magic-angle s…
The inhomogeneous Ornstein–Zernike equation and the Triezenberg–Zwanzwig expression for the density profile are solved using the Percus–Yevick closure for the inhomogeneous pair correlations of a hard-sphere fluid in the vicinity of an isolated hard-sphere particle. Results are presented for the solvent density profil…
A greenhouse experiment was conducted to evaluate “liming”; potential of different green manures. Ground leafy materials of cowpea (Vigna unguiculata), leucaena (Leucaena leucocephala) and guinea grass (Panicum maximum) were added at 0, 5, 10 and 20 g/kg to an Ultisol having a soil‐water pH 4.0, KCl‐extractable Al = 7…
Fully densified silicon nitride without additives was fabricated by means of hot isostatic pressing. The sintering process of highly pure powder was investigated with special interest in the evolution of α–β phase transformation, densification, and microstructure development. It was observed that the transformation oc…
Six individual amino acid substitutions at separate positions in the tertiary structure of subtilisin BPN' (EC 3.4.21.14) were found to increase the stability of this enzyme, as judged by differential scanning calorimetry and decreased rates of thermal inactivation. These stabilizing changes, N218S, G169A, Y217K, M50F…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain dynamics, mesh size, and diffusive transport in networks of polymerized actin: a quasielastic light scattering and microfluorescence studyChristoph F. Schmidt, Michael Baermann, Gerhard Isenberg, and Erich SackmannCite this: Macromolecules 1989, 22, 9, 3638–3649Publica…