Materials Literature
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Several methods have been developed which derive the orientation distribution (ODF) in a polycrystalline sample from pole figures measured by X-ray or neutron diffraction techniques. The theoretical backgrounds of the conventional harmonic method, of the vector method and of the method of Williams [J. Appl. Phys. (196…
Abstract Chromate (CrO 4 2− ) adsorption was investigated on kaolinite (0.2–2 μ m) saturated with NaClO 4 over a range of pH. Adsorption increased with decreasing pH because of protonation of chromate and/or variable charge sites on kaolinite. Chemical pretreatment to remove noncrystalline and crystalline oxide contam…
A macroscopic shape memory effect is demonstrated by first deforming a CeO 2 ‐stabilized tetragonal zirconia polycrystal (Ce‐TZP) between the M b and A s temperatures and then recovering the shape change by heating above A b . Shape changes effected above A b are immediately recoverable during unloading, giving rise t…
Recent interest has been shown in the utilization of electrochemical noise as a method for the investigation of corrosion reactions. Studies of potential fluctuations under open‐circuit conditions indicate that the r.m.s. amplitude, or standard deviation, of the noise is related to the corrosion rate as calculated fro…
We used a molecular modeling approach to search for a conformation of docosahexaenoic acid (DHA) that might uniquely influence acyl chain packing in cell membranes. Studies of DHA models containing six cis double bonds and five intervening methylene groups identified two conformations of special interest. Both had nea…
Two constitutive acetoacetyl-CoA (AcAc-CoA) reductases were purified from Alcaligenes eutrophus. Incorporation of [1-14C]-acetyl-CoA into poly-3-hydroxybutyrate (PHB) by systems reconstituted from purified preparations of either 3-ketothiolase, AcAc-CoA reductase and PHB synthase, occurred only when NADPH-AcAc-CoA red…
A new design for an infrared cell useful for studies of the spectrum of surface species on high area solids is presented. The cell is well suited over a wide temperature range (100–1000 K). Other demonstrated features of the cell include ultrahigh-vacuum operation, temperature control to ±1 K, linear and rapid tempera…
Kinetic studies performed on p21H guanine nucleotide complexes with and without Mg2+ show that point mutations at positions 12, 59, and 61 each have a different effect on the rate of nucleotide dissociation. Double mutants with a combination of these amino acid substitutions reveal that the effects of each mutation on…
A dynamical model of the temporal dependence of photostimulated luminescence of the storage phosphor BaFBr:Eu2+ as a result of preceeding x-ray irradiation is presented. The model is based on a monomolecular recombination mechanism. The commonly used bimolecular mechanism leads to contradictions with experimental obse…
The light-sensitive elements of conventional photographic materials are crystallites principally of the bromide or chloride salts of silver. Certain chemical modifications employing sulphur and gold compounds are used to maximize the response, and organic dyes are adsorbed to provide sensitivity throughout the visible…
Advances in machine learning have impacted myriad areas of materials science, such as the discovery of novel materials and the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this ...Read More
Sir Nevill Mott 1987 Oxford: Oxford University Press viii + 128 pp price £17.50 ISBN 0 19 851981 8 A new book by Sir Nevill Mott, even though a small one, can be expected to provide a significant contribution to solid state physics. This one highlights the extension, in recent years, of non-crystalline electronic soli…
We present the results of an extensive molecular-dynamics simulation of a dense polymer system. We show for the first time that simulations are able to cover the whole regime from pure Rouse dynamics to reptation dynamics and give strong evidence of the latter. The mean square displacements clearly exhibit a ${t}^{\fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence and relaxation dynamics of cadmium sulfide superclusters in zeolitesYing Wang and Norman HerronCite this: J. Phys. Chem. 1988, 92, 17, 4988–4994Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissue 1 August 1…
Abstract Over the last four decades, numerous reports have appeared on the physico‐chemical kinetics, especially crystallization kinetics, based on the Avrami equation, ϕ = exp [− Kt n ] where ϕ is the fraction of material unchanged at time t , K is an overall rate constant and “ n ” is the Avrami exponent indicative…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT6-311G(MC)(d,p): a second-row analogue of the 6-311G(d,p) basis set: calculated heats of formation for second-row hydridesMing Wah Wong, Peter M. W. Gill, Ross H. Nobes, and Leo RadomCite this: J. Phys. Chem. 1988, 92, 17, 4875–4880Publication Date (Print):August 1, 1988Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and morphology of syndiotactic polypropylene single crystalsBernard Lotz, Andrew J. Lovinger, and Rudolf E. CaisCite this: Macromolecules 1988, 21, 8, 2375–2382Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published in…
The solid electrolyte of the system exhibited high ionic conductivity, as well as almost unity ionic transference number at 600°–1000°C. High current density and electrical power can be obtained from a fuel cell at 600°–800°C. was an excellent cathode as compared with Pt electrode. A thin film of stabilized zirconia c…
Silica film was deposited on the surface of soda lime silicate glass by immersing it in hydrofluosilicic acid solution supersaturated with silica gel at low temperature. The composition and the structure of these films were evaluated using ESCA, IRRS, fluoric acid etching test, and sodium leaching test, and they were…
The acoustic transients emitted after breakdown and cavitation bubble collapse upon focusing a Q-switch laser pulse into a liquid are investigated with special emphasis on their modifications induced by a solid boundary. For measuring the form p(t)/pmax of the pressure pulses an optical technique with a resolution of…