Materials Literature
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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…
The microstructures of commercial purity aluminium near the friction weld interface were observed by transmission electron microscopy. Large plastic deformation of aluminium occurred near the weld interface and the microstructure of the aluminium was oriented from the centre to the periphery of the weld nugget. The al…
R2Fe17 (R = rare earth) intermetallic compounds constitute one of the most important classes of materials identified as high-energy permanent magnet materials. They crystallize either in the rhombohedral Th2Zn17 structure (for light R) or in the hexagonal Th2Ni17 structure (for heavy R). In this article, we discuss th…
This paper deals with the Riemann problem for a partial differential equation's model arising in phase-transition dynamics and consisting of an hyperbolic–elliptic system of two conservation laws. First of all, we provide a complete description of all solutions of the Riemann problem that are consistent with the mathe…
The natural world contains millions of species of living organisms and these contain a great range of components and processes that have been proven to function very reliably in harsh environments. One of the key reasons for the high reliability of living organisms is the existence of reliability and safety strategies…
Single-phase perovskites in the solid solution series La 0.7+ y A 0.3 - y Mn 1 - x M x O 3 (with 0.00 ≤ x ≤ 0.10; A = Sr 2+, M = Cu 2+, Zn 2+, Sc 3+, Cr 3+, Co 3+, and Ga 3+; A = Ba 2+, M = Cu 2+, Zn 2+, and Sc 3+ ) have been prepared via the acetic acid solutions freeze-drying method. This soft procedure makes possib…
The behaviour of liquid crystal materials used in display devices is discussed. The underlying continuum theory developed by Frank, Ericksen and Leslie for describing this behaviour is reviewed. Particular attention is paid to the approximations and extensions relevant to existing device technology areas where mathema…
Clusters with polycyclic twelve-membered rings were formed exclusively from the reaction of [Hg(TePh)2] with HgX2 in pyridine. Clusters with just six members were formed from the same reaction in DMSO. In both cases, the solvent was coordinated to the clusters. The clusters, [Hg6(μ-Br)2Br2(μ-TePh)8(py)2] and [Hg3X3(μ-…
This paper describes the crystallographic features of a platelet-shaped precipitate that forms in the early stage of age hardening of Mg alloys containing rare-earth elements in the Ce subgroup. Transmission electron microscopy combined with computer simulation revealed that the precipitate, the habit plane of which i…
Sub-quarterwave multilayer coatings with more than two different materials are shown to provide a reflectance enhancement compared with the standard two-material multilayer coatings when reflectance is limited by material absorption. A remarkable reflectance enhancement is obtained when the materials in the multilayer…