Materials Literature
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Nuclear magnetic resonance (NMR) of $^{63}\mathrm{Cu}$ and nuclear quadrupole resonance (NQR) of $^{75}\mathrm{As}$ have been used to study relaxation effects and the possibility of local atomic diffusion in the Cu-As-S and Cu-As-Se glassy systems. The frequency and temperature dependences of the spin-lattice and spin…
A simple computational method for the calculation of natural frequencies and transient voltage distribution in the primary and the secondary of a single-phase transformer windings was developed. The equivalent circuits developed for different test conditions for transient analysis accounts for various inductive and ca…
Some recent advances in the knowledge base with respect to the ability to calculate fission product transport behavior in the reactor coolant system (RCS) and the containment for light water reactor severe accident conditions are discussed. Only minor advances are noted with respect to aerosol behavior. These include…
Electro- and thermomigration of metallic islands of µm size formed by vapor deposition on the Si(100)2×1 surface have been investigated using an ultrahigh-vacuum scanning electron microscope (UHV-SEM) at substrate temperature higher than the melting point of the islands. The direction of electromigration versus the el…
A New and Reliable Model for Predicting Oilfield Scale Formation Y.D. Yeboah; Y.D. Yeboah Research Inst., KFUPM Search for other works by this author on: This Site Google Scholar S.K. Somuah; S.K. Somuah Research Inst., KFUPM Search for other works by this author on: This Site Google Scholar M.R. Saeed M.R. Saeed Rese…
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…