Materials Literature
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The concept of the characteristic curve in physical adsorption and the rule of its temperature invariance is traced from the potential theory of adsorption by Polanyi to the Frenkel–Halsey–Hill equation, the theory of volume filling of micropores by Dubinin et al. and the theory of adsorption on heterogeneous surfaces…
Under extremely mild conditions (room temperature) the hexahydroporphyrin 2 isomerizes to its tautomer 3. Complex 2 is the first metal complex with a 2,3,7,8,15,23-hexahydroporphyrin as ligand and is synthesized from 1 by reduction with sodium amalgam.
Recent data from deep uranium mines in Czechoslovakia indicated that in addition to radon daughter products, miners are also exposed to chemical mutagens. Mycotordns were identified as a possible source of mutagenicity present in the mines. Various methods of biomonitoring were used to eaamine three groups of miners f…
<div class="htmlview paragraph">Diesel ceramic coatings are now being applied to automotive engine components such as valves, pistons and heads to eliminate visible smoke, inhibit the formation of NOx, reduce CO and particulate emissions and improve combustion efficiency. Recently, specially designed software ha…
The constitutive equation of magnetic materials and the associated magnetic field analysis are presented. The B- and H-values have been measured as vector relationships under the influence of a rotating field, using the two-dimensional magnetic measurement apparatus. The magnetic properties are represented by a tensor…
We measured the selectivity coefficient (K V) for K-Ca exchange equilibrium as a function of K-saturation on two smectitic soils, two halloysitic soils and a soil dominated by noncrystalline aluminum silicates. The selectivity coefficients for all the soils decreased as K-saturation increased. Among the five soils, th…
The chemical nature of Si surfaces treated with ammonium fluoride (NH4F) has been investigated using photoemission and surface infrared spectroscopy. On the surface after treatment in NH4F solution, there remain ammonium compounds such as NH4F and NH4F.HF. Photoemission data demonstrate that under the atmospheric envi…
Low frequency dielectric investigations of disordered trimethylammonium cations are presented and discussed. Ordering process of N(CH3)3H+ cations are described by means of an asymmetry of doubleminimum potential. Pyroelectric experiment on TMACA provided clear evidence of another continuous phase transition at 127 K…
New developments using artificial intelligence and the computer can effect changes in the production of apparel and ultimate consumer satisfaction with apparel products. Much data specification is needed before apparel can be manufactured that quickly and efficiently takes into account the individual body of the consu…
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Fission gas behavior of UO2 fuel pellets with controlled microstructure irradiated to 23 GWd/t in a test reactor has been studied by using a postirradiation annealing experiment. Four types of fuel pellets with or without additives were examined : (1) un-doped standard (grain size: 16/μm), (2) un-doped large grained (…
<div class="htmlview paragraph">The relationship between hydrogen gas and microporosity in magnesium alloy AZ91 was quantified, refuting the belief that hydrogen levels less than the maximum solid solubility are of no detriment. Sand castings were made from melts containing measured levels of hydrogen gas, and t…
Abstract The crystal structure of KBSi 3 O 8 (orthorhombic, Pnam , with a = 8.683(1), b = 9.253(1), c = 8.272(1) Å,, V = 664.4(1) Å 3 , Z = 4) has been determined by the direct method applied to 3- dimensional rcflection data. The structure of a microcrystal with the dimensions 20 × 29 × 37 μm was refined to an unweig…
Abstract The electric charge and surface characteristics of montmorillonite (Mt) complexed with hydroxy‐Al (HyA) or hydroxyaluminosilicate (HAS) ions were studied in the pH range of 4 to 8. The HAS or HyA ions were prepared from solutions containing HyA ions and orthosilicic acid at an Al concentration of 4 mmol L ‐1…
Abstract Mit einer Schmelzmitteltechnik wurde erstmals Ba 3 In 2 Zn 5 O 11 dargestellt und an Einkristallen röntgenographisch untersucht. Es kristallisiert kubisch, in der Raumgruppe T ‐F 4 3m, mit a = 13,3588 Å und Z = 8. Zn 2+ ist tetraedrisch von O 2− koordiniert und bildet Zn 10 O 20 ‐Makropolyeder. Ferner wird de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-order nonlinear optical response of some tetrasubstituted cumulenesIvan Kminek, Josef Klimovic, and Paras N. PrasadCite this: Chem. Mater. 1993, 5, 3, 357–360Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March 1…
A transient solution is derived for the reflected pressure along the axis of symmetry of a concave ellipsoidal mirror. The incident field is a spherical wave produced at the near focus of the mirror. It is assumed that the characteristic wavelengths are short in comparison with the minimum radius of curvature of the m…
High-resolution x-ray scattering and ac-calorimetric measurements have been carried out near the nematic--smectic-${\mathit{A}}_{1}$ phase transition of the pure liquid-crystal compound octyloxyphenylnitrobenzoyl- oxy benzoate (${\mathrm{DB}}_{8}$${\mathrm{ONO}}_{2}$). Several forms of the structure factor S(q) for fi…
This report describes the design and construction of apparatus to measure the specific heat capacity of solid materials in the temperature range IB-32°C. The apparatus is designed to minimize heat losses from the sample in order to measure the specific heat to an accuracy of better than :to.2% at the 95% confidence le…
Experimental results of very large, long-wavelength photocurrent gains in amorphous silicon-based Schottky barrier structures are reported. It is shown that these occur for devices in the space-charge current regime operated at forward bias voltages past the flatband condition. The analysis of microelectronic and phot…