Materials Literature
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The effect of Cr, Al, and Si on the anodic polarization characteristics of Fe-Cr alloys was studied, with Cr content ranging from 10% to 18% in sulfuric acid (H2SO4) and sodium chloride (NaCl) aqueous solutions. It was shown that the effect of Al depended on Cr content while the beneficial effect of Si was found to be…
A generalization of the function of influence of a unit heat source to the displacements is suggested for the boundary value problems in the dynamical uncoupled thermoelasticity. This generalization is a convolution over time and bulk of two influence functions. One of them is a Green's function for the heat conductio…
Abstract The structure and the mechanical properties of blends of an amorphous polyamide (PA) and a thermotropic copoly(ester‐amide) (VB) obtained both by direct injection molding (DI) and also by extrusion and subsequent injection molding (EI) have been studied. Besides the usual fibrillar morphology of the skin, fib…
We have measured the Raman spectra of β- and α-barium metaborate in crystal and liquid states from room temperature to 1873 K, with a semiconductor laser as the laser source, coupled with a time-resolved detection system to eliminate the dense thermal emission background when temperature was considerably high. Tempera…
The damage tolerance of Ti3SiC2 has been identified by Vickers indentations and single edge notched beam (SENB) testing. The Vickers indentations were made at loads of 0·5—30 kg to measure the hardness. The results showed that the hardness decreased with increasing loads. No indentation cracks were observed around the…
Nanosized (10–30 nm particle size) hexagonal barium monoaluminate, having a high surface area of ∼30 m 2 /g, was synthesized by calcination of hydrothermally prepared precursors. The precursors were obtained by hydrolytic precipitation, using a mixed solution of barium and aluminum nitrates in the presence of aqueous…
Under solvothermal conditions, the reaction of Te, TeBr4 and UBr5 in SiBr4 at 200?C yields Te8[U2Br10] as silvery crystals. The crystal structure (triclinic, P&1macr;, a = 900.8(4), b = 1205.1(5), c = 1366.0(6) pm, α = 80.93(4)?, β = 76.83(3)?, γ = 78.84(3)?, Z = 2) is built of one-dimensional polymeric (Te82+)n catio…
The powder characteristics of two types of Si 3 N 4 (referred to as FD1 and FD2), as well as the rheological properties of their aqueous suspensions, were studied in this paper. There are distinctive differences in size distribution, soluble counterions, and surface groups. Highly concentrated aqueous slurries could n…
This paper presents the results of the investigation of the thermodynamic properties of γ‐aluminum oxynitride (AlON). The phase relations and thermodynamic properties of AlON were analyzed and the Gibbs energies of AlON with different compositions and temperatures were calculated by a thermodynamic quasi‐parabola rule…
Predicting Brine Mixing Deep Within the Reservoir, and the Impact on Scale Control in Marginal and Deepwater Developments E.J. Mackay; E.J. Mackay Heriot-Watt University Search for other works by this author on: This Site Google Scholar M.M. Jordan; M.M. Jordan ONDEO Nalco Energy Services Search for other works by thi…
Significant amounts of boron in both trigonal and tetrahedral coordination have been found through 11 B magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy of natural olenite (aluminum-rich tourmaline) from Stoffhütte, Koralpe, Styria, Austria. The 11 B MAS NMR spectrum consists of a superposition…
The inhibition effects of 3,5 bis (2-pyridil) 4-amino 1,2,4 triazole (NBTA) and 1-10 phenantrolin (PHEN) , on corrosion of mild steel in acid solutions, (sulphuric acid and hydrochloric acid) were studied. The Tafel polarisation and ac impedance techniques were employed. Results obtained reveal that both compounds are…
Abstract The effect of heavy doses (up to 200 Mrad) of γ-radiation on the short-range structural organization in montmorillonite was studied using infrared (IR) spectroscopy and solid-state high-resolution 27 Al and 29 Si nuclear magnetic resonance (NMR). No change attributable to irradiation was observed. A small var…
Abstract Addition of a second metal often improves the selectivity of a supported catalyst for the hydrogenation of 1,3‐butadiene. Catalysts containing 15 wt% Ni and varying amounts of Cu were prepared and characterized by TPR, XRD and XPS. The Cu‐Ni interaction affects the reduction behavior of the catalysts. TPR res…
Fluorocarbon (FC) coatings are applied to poly(ethylene terephthalate) (PET) fabrics by ion beam sputtering of polytetrafluoroethylene (PTFE) under different conditions. The range of the adhesion work of the coated fabrics is 5-75 10 -3 N.M -1 . After a washing and wearing test, most of the original coating grains rem…
A series of β,β-dihydroxychlorins derived from meso-tetraphenylporphyrins (TPPs) have been synthesized. Their in vitro cytotoxicity has been measured and compared to BPDMA (verteporfin). Under the assay conditions BPDMA had an LD 50 (lethal dose to kill 50% of cells) value of 0.007 μM (5 ng/mL). The LD 50 values for t…
The electrochemical behaviour of two copper nickel alloys; cu-20 wt-%Ni and Cu-80 wt-%Ni, was studied in alkaline solution using the cyclic voltammetric technique. The voltammograms of the alloys were compared with those of the pure copper and pure nickel recorded under the same conditions. The influence of different…
Abstract Polarized micro-Raman spectra of a single large crystal of Keokuk kaolinite were recorded in the OH-stretching region with the laser beam directed along the different crystal axes. The Raman spectra are characterized by five OH-stretching bands at 3694, 3683, 3668, 3650 and 3620 cm −1 labeled A, Z, B, C and D…
Sialic acids are a group of carboxylated amino sugars important for a variety of cellular functions. N-Acetylneuraminic acid (Neu5Ac) is the predominant sialic acid in nature. Neu5Ac-9-phosphate synthase catalyzes the formation of Neu5Ac-9-phosphate from N-acetylmannosamine-6-phosphate and phosphoenolpyruvate. Neu5Ac-…
Abstract Bacterial mineralization in weathered pyroclastic deposits of the Kaimondake volcanic ash (4040 ybp) and the Koya pyroclastic flow (6400 ybp) was investigated to evaluate the impacts of bacteria on mineral formation, and to characterize the microbiogenic minerals in the weathering environment. The mineralogy…