Materials Literature
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A novel pillared synthetic saponite, prepared by exchanging Na+ in the interlayer of saponite [idealized formula; Na+x(Mg3)oct.(Si4 –xAlx)tet.O10(OH)2] with an Al hydroxy cluster cation followed by calcination, gives a high catalytic activity and a high yield of p-xylene isomer for toluene alkylation by methanol.
Composite prismatic strucure has been examined in Nuculidae, Lucinidae, Cardiidae, Tellinidae, Psammobiidae, Donacidae and Veneridae. This microstructure is divided into three basic structural varieties: typical composite prismatic, characteristic of Nuculidae (Nucula); fibrous composite prismatic, observed in Cardiid…
This paper addresses problems involved in measuring fracture toughness of thin pressure tube material which, in the presence of radial-axial hydrides, undergoes a significant brittle to ductile fracture transition. Compact tension specimens (∼5 mm thickness) are machined from flattened tensile strips of Zircaloy-2 in…
The decarburization and surface oxidation reactions were observed during the decarburization annealing cycle of a 3 wt–%Si regular grain oriented electrical steel. Annealing was carried out at four H2O/H2 ratios in the range 0·14–0·7 and three temperatures (787, 843, and 899°C) for time periods of up to 30 min. Gravim…
Based on a review of hydrogen injection test at BWRs, several possible factors were selected and studied to refine the radiolysis model previously proposed by the authors. The differences between calculated and measured dissolved oxygen concentrations were reduced 40% at low hydrogen concentration (<40 ppb) in reactor…
Liquid crystal phases of the polar molecule DB9ONO2 display fluctuations on two incommensurate and temperature dependent length scales. We have used high resolution X-ray scattering to study the structure of this material between 80 °C and 230 °C at atmospheric pressure. We confirm the previously reported phase sequen…
The ion exchange of monoprotonated proflavine on Wyoming bentonite, Camp Berteau montmorillonite and a synthetic mica-type montmorillonite, Barasym SSM-100, results in the presence of monoprotonated and diprotonated proflavine and dimers on the surface after freeze-drying. On Barasym SSM-100, below a loading of 500 µm…
The crystal structure of tetrakis(1-norbornyl)cobalt (1) was determined and, together with magnetic susceptibility measurements, establishes (1) as the first example of a low spin tetrahedral complex of a first row transition metal and as the only structurally characterized cobalt(IV)–alkyl complex.
Stable overcrowded ethylene dianions, viz. bifluoren-9-ylidene dianion (1)2– and bi-(4H-cyclopenta[def]phenanthren-4-ylidene) dianion (2)2– were prepared via metal reduction and characterized by 1H and 13C n.m.r. spectroscopy; the spectroscopic results as well as ωβ calculations performed on the hydrocarbons (1) and (…
Polymer alloys with mixed electronic and ionic conductivity have been synthesized from perfluorosulphonated ionomer membranes (bulk or solution) and monomer precursors of electronically conducting polyaromatic polymers such as polypyrrole or polyaniline.
Abstract The determination of the structures of catalysts is an important step in understanding their behaviour and in developing new or improved catalysts. By their nature, catalysts mostly have a structure which can be resolved only by transmission electron microscopy (TEM) used near its limit of applicability. This…
Dissolution profiles for solid dose forms represent several observations over time on an experimental unit such as a tablet or capsule. The pharmaceutical scientist is interested in a (statistical) comparison of these profiles under a variety of conditions relating to formulation characteristics, and lot-to-lot and br…
Three new glycosides named cynapanosides A (1), B (2), and C (3) which contain a new aglycone, glaucogenin D (10), were isolated from Cynanchum paniculatum, in addition to the known compounds, cynatratoside B (5) and 3β, 14-dihydroxy-14β-pregn-5-en-20-one (13). Their structures were elucidated by spectroscopic and che…
The rate of methanol formation from H2/CO synthesis gas over the binary Cu/ZnO catalyst can be greatly increased on doping with caesium without increasing the formation of higher oxygenate products above 1.1 mol%.
Outre une clé des familles, les auteurs proposent dans cet opuscule une clé des principaux genres planctoniques et une clé des espèces planctoniques des genres les plus communs dans les eaux continentales françaises ou européennes. Ces clés s'appuient sur des caractères morphologiques, anatomiques et écologiques aisés…
The film formation of magnesium stearate on the surface of acetylsalicylic acid was investigated by applying a flow-through dissolution technique. The effect of mixing time, lubricant surface area, and the addition of colloidal silica was studied. The film formation increased by increasing mixing time. The final level…
Abstract Short glass fiber reinforced polypropylene is one of the composites with the widest range of applications in the plastics industry. The partial replacement of the glass fibers by sepiolite, brings forth a hybrid composite with better mechanical properties and, as a result, enhanced compatibility and better in…
STP 909 has sixteen peer-reviewed papers divided into four sections that reflect changes in the nuclear power industry occurring since 1981, including escalating capital requirements and a growing worldwide dependence on nuclear power for electricity prod
Abstract Rutherford backscattering spectrometry (RBS) is a major materials characterization technique that can provide information in a short analysis time. It is used for quantitative compositional analysis of thin films, layered structures, or bulk materials and to measure surface impurities of heavy elements on sub…
Description A practical book containing background information and research results of particular interest to materials engineers who design structures subject to possibility of failure by fracture. Categories: ductile fracture, test methods development, surface cracks and crack shape effects, and high temperature and…