Materials Literature
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A new method for the acid hydrolysis of protein is presented. Peptide bonds are cleaved by the action of an HCl/trifluoroacetic acid (TFA) vapor mixture. Contamination for the hydrolysis mixture is reduced to low levels (1-3 pmol). Recovery of hydrophobic amino acid is improved. Short reaction times are achieved and r…
The Stoner model of itinerant ferromagnetism in combination with self-consistent linear muffin-tin orbital non-spin-polarized calculations are used for analysis of metamagnetic behavior of fcc iron. The developed procedure enables one to identify all the possible ferromagnetic phases (stable, metastable, and unstable)…
A 104- to 105-times more intense absorption than the corresponding aqua complexes is exhibited by the cryptates 1 and 2; in the latter the ligand absorbs, in the former the metal ion. From the luminescence-lifetimes in H2O and D2O it can be deduced that in Eu nine or ten H2O molecules coordinate the Eu3⊕ ion, whereas…
Structural and electrical properties of rf-sputtered amorphous BaTiO3 thin films grown on water-cooled substrates have been investigated. The dielectric and electrical properties have been studied for films grown under varying sputtering gas composition (Ar+O2 gas mixtures) as a function of film thickness, frequency,…
The theory underlying the steady-state photocarrier grating technique is presented, including the effect of surface recombination. Experimental results for amorphous hydrogenated silicon and semi-insulating GaAs prove that diffusion lengths ranging from 200 Å to 10 μm can be measured with an accuracy of better than 5%.
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…