Materials Literature
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The dissolution kinetics of TiO 2 powders in HF‐HCl solutions was studied as a function of time, temperature, and acid concentration. The rate of dissolution was linear with time, directly proportional to [HF], independent of [HCl], and exhibited an exponential temperature dependence with an activation energy of 74.9…
The zero-temperature value of the magnetocrystalline anisotropy (MCA) energy of trivalent rare-earth ions and its temperature dependence have been calculated for the whole series of the ${R}_{2}$${\mathrm{Fe}}_{14}$B compounds. The computations, performed with a single-ion origin of the anisotropy and within a molecul…
A dependence of the electric strength on thickness, area and volume of dielectric is demonstrated for polypropylene film. It is found that the electric strength of theoly polymer film decreases with volume. It is shown that theunc function of electric strength is not simply dependent on the volume as obtained from the…
A deterministic growth process, based on the solution of the lattice Laplace equation for the temperature field, is introduced for modelling pattern formation in dendritic solidification. By a simple parameterisation of the physical and environmental conditions during crystal growth a wide variety of dendritic pattern…
The dynamics of an electron described by the one-dimensional tight-binding Hamiltonian with quasiperiodic (Fibonacci) modulation is studied numerically. The width of an initially localized wave packet is found to increase with time t in an overall power-law form \ensuremath{\sim}${t}^{\ensuremath{\alpha}}$ (0<\ensu…
The use of ultra‐high‐purity powder processing and multiple solid‐solution additive doping has been evaluated as an effective approach for the fabrication of alumina ceramics. MgO was found to inhibit grain growth more strongly in very pure powders because of its stronger solute drag effect. The degree of inhibition w…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Changes in the structure of nylon 6 fibers annealed in dry and wet atmospheres were studied by small-and wide-angle x-ray diffraction. In the presence of water or saturated steam, fibers can be annealed to the same strucutral state at temperatures 70°C lower than in dry atmosphere. This is due to the enhanced mobility…
Abstract not Available.
SUMMARY A set of well‐drained soils in Galicia, formed from gabbros, amphibolites and schists, with udic moisture and mesic temperature regimes, are studied. All but one of the surface horizons show an‘exchange complex dominated by amorphous material’(ECDAM); consequently, most soils are classified as Andosols (FAO) o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChloride-binding reactions and electrochemistry of (tetraphenylporphyrinato)cobalt and chloro(tetraphenylporphyrinato)cobalt in dichloromethaneKarl M. Kadish, X. Q. Lin, and B. C. HanCite this: Inorg. Chem. 1987, 26, 25, 4161–4167Publication Date (Print):December 1, 1987Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, x-ray diffraction structure, magnetic properties, and MO analysis of a binuclear (.mu.-tetrathiooxalato)copper(II) complex, (AsPh4)2[(C3OS4)CuC2S4Cu(C3OS4)]Ramon Vicente, Joan Ribas, Santiago Alvarez, Alex Segui, Xavier Solans, and Michel VerdaguerCite this: Inorg…
Abstract The dehydroxylation of kaolinite has been investigated by isothermal thermogravimetry. Kinetic analysis using the Avrami equation shows that a combination of atomic mechanisms operates throughout the temperature range 734 K to 890 K. An empirical activation energy of 222 kJ mol -1 was calculated from the Arrh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-crossover cobalt(III) complexes: steric and electronic control of spin stateWolfgang Klaeui, Werner Eberspach, and Philipp GuetlichCite this: Inorg. Chem. 1987, 26, 24, 3977–3982Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Publi…
The mechanism of nitric oxide reduction with ammonia to form N<sub>2</sub>, H<sub>2</sub>O, and N<sub>2</sub>O both in the presence and in the absence of O<sub>2</sub> over the following series of catalysts, unsupported V<sub>2</sub>O<sub>5</sub>, V<sub>2</sub>O<sub>5</sub> on TiO<sub>2</sub>, V<sub>2</sub>O<sub>5</su…
Infrared spectroscopy has been used to measure the concentrations of molecular CO_2, \nand carbonate in albitic (NaAlSi_3O_8) glasses quenched from melts equilibrated with CO_2, \nvapor at high pressures (15-30 kbar) and temperatures (1450-1625 °C). At constant temperature, \nthe concentrations of carbonat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of oxidic and reduced alumina-supported molybdate and heptamolybdate species by in situ laser Raman spectroscopyE. Payen, J. Grimblot, and S. KasztelanCite this: J. Phys. Chem. 1987, 91, 27, 6642–6648Publication Date (Print):December 1, 1987Publication History Publishe…
With an eye toward the development of nitroxides as potential contrast enhancing agents for MRI applications, we have compared the rates of reduction of 24 nitroxides of diverse structures by rat whole liver homogenate, hepatocytes, subcellular fractions, and ascorbate (10 eq excess). Our results indicate that five-me…
Abstract Several new minerals, structurally and chemically similar to the hydrotalcite-manasseite group, have been found in the saline deposits of the central pre-Caspian depression and in those of Middle Asia. Their structures consist of layers of (Mg 1-x Al x )(OH) 2 plus interlayers of anions and molecular water. I…
In this study, the adhesive exopolysaccharides of strains of Pseudomonas putida and P. fluorescens, both isolated from freshwater epilithic communities, were examined with regard to their chemical composition, biosynthesis, and their role in adhesion. Electron microscopy showed that both strains were enrobed in fibrou…