Materials Literature
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Recrystallization of the solid Cd(10)S(4)(SC(6)H(5))(12) from a solution of pyridine and N, N-di-methylformamide (DMF) results in the formation of the cluster Cd(32)S(14)(SC(6)H(5))(36)-DMF(4) as pale yellow cubes. The structure consists of an 82-atom CdS core that is a roughly spherical piece of the cubic sphalerite…
ABSTRACT Trace amounts of metal chelant additives, commonly used in stimulation and fracture fluids, have been shown to have a debilitating effect upon the performance of widely used barium sulfate scale inhibitors. EDTA and citric and gluconic acids render examples of some commonly used scale inhibitors (phosphonates…
Abstract A new and reliable Oilfield Scale Prediction Model (OSPMod) has been developed and is presented. Unlike the available models which predict only scaling potential using thermodynamics and limited solubility data, OSPMod predicts the potential and deposition profile based on extensive thermodynamic and kinetic…
ABSTRACT The effectiveness of commercially available scale dissolvers for removing mineral scales from reservoir cores was studied in the laboratory. Fluids and preserved cores from a major North Sea reservoir were used. Equipment and procedures were developed to reproducibly deposit scale in reservoir cores. Then, th…
Schlippe's salt (sodium thioantimonate nonahydrate—Na 3 SbS 4 ·9H 2 O) has been investigated by means of X-ray powder diffraction at room temperature. The indexed X-ray powder diffraction data are presented.
Studies of core debris interaction with concrete have been extensive over the last decade. These studies have reached a climax in recent tests of the interactions of prototypical melts of UO2, ZrO2, zirconium, and stainless steel with concrete. Zirconium metal has been found to have profound effects on melt interactio…
The characteristics of silver enhancement of immunogold staining at the electron microscopy level were evaluated. Five differently sized gold particles (1,5,15,30 and 40 nm) were tested for 10 different enhancement durations (1–17 min) with atrial natriuretic peptide in rat atria as a model. We found that the size of…
The structure of aldose reductase, a monomeric enzyme of 314 amino acids which crystallizes in space group P1 with four monomers per asymmetric unit, has been solved using a combination of single isomorphous replacement (SIR), solvent flattening and local symmetry averaging. The self rotation showed evidence of 222 lo…
The reactor for the planned Advanced Neutron Source uses closely spaced fuel plates cooled by water flowing through narrow channels. A series of tests are being conducted on the structural response of the proposed fuel plates to the required high-coolant flow velocities. Results from tests on additional fuel plate ass…
The potential of a South African coal, Bosjesspruit, as a precursor for a phosphoric acid-activated carbon has been assessed using the adsorption of nitrogen at 77 K and mercury porosimetry. Column cleaning of the coal by froth flotation reduced the ash content from 22 to 12 wt.% and caused maceral separtion, resultin…
Abstract This article describes the various tests that should be considered in the chemical stability testing of drugs prepared in hospital pharmacy. The requirement for a stability indicating analytical method to carry out such tests is emphasised.
The surfaces with vanishing mean curvature, or minimal surfaces, are linear projections of minimal surfaces imbedded in the complex 3 dimensional space C 3. For real minimal surfaces, the Bonnet transformations form a one parameter group of isometries which correspond to generalised rotations in the complex or higher…
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…