The Amino Acid Composition of Major Ampullate Gland Silk (Dragline) of Nephila Clavipes (Araneae, Tetragnathidae)
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Materials Literature
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Corrosion of Iron in Gaseous Environments and in Gas-Saturated Aqueous Environments
The corrosion of alloy 4130 (UNS(1) G41300) steel has been investigated at temperatures up to 400°F in gaseous environments containing varying amounts of H2S and CO2 and in gas-saturated aqueous environments having dissolved chlorides. Thermogravimetric techniques have been used for establishing the kinetics of corros…
Nickel and Nickel Alloys
Abstract Nickel in elemental form or alloyed with other metals and materials has made significant contributions to our present-day society and promises to continue to supply materials for a demanding future. This article provides a historical overview and physical metallurgy of nickel and nickel alloys. It lists and d…
Wrought Stainless Steels
Abstract This article discusses the composition, characteristics, and properties of the five groups of wrought stainless steels: martensitic stainless steels, ferritic stainless steels, austenitic stainless steels, duplex stainless steels, and precipitation-hardening stainless steels. The selection of stainless steels…
Specific properties of amphiphilic particles at fluid interfaces
We present a theoretical and experimental study of amphiphilic particles : these are small solid spheres treated so that one part of the solid is hydrophilic whereas the other is hydrophobic. These beads have a specific behaviour at the interface between two fluids of different polarities since they are anchored at th…
Electronic structure of poly(tetrafluoroethylene) studied by UPS, VUV absorption, and band calculations
Electronic structure of poly(tetrafluoroethylene) studied by UPS, VUV absorption, and band calculations, Kazuhiko Seki, Hiroshi Tanaka, Toshiaki Ohta, Yuriko Aoki, Akira Imamura, Hitoshi Fujimoto, Hiromichi Yamamoto, Hiroo Inokuchi
Capacitors
A review of capacitor fundamentals and technology that is intended for the clarification of the modes of operation of the broad spectrum of capacitors, including paper/polymeric films, electrolytics, and ceramics, is presented. How each class of capacitor performs in both low- and high-power electronics is discussed i…
Preisach modeling and reversible magnetization
Methods of dealing with reversible magnetization in the context of Preisach modeling are examined. A generalization of the vector product model which includes reversible effects, as well as the usual irreversible effects, is presented.>
Oxidation reaction of [{Cu(Hpz) 2 Cl} 2 ](Hpz = pyrazole): synthesis of the trinuclear copper( II ) hydroxo complexes [Cu 3 (OH)(pz) 3 (Hpz) 2 Cl 2 ]·solv (solv = H 2 O or tetrahydrofuran). Formation, magnetic properties, and X-ray crystal structure of [Cu 3 (OH)(pz) 3 (py) 2 Cl 2 ]·py (py = pyridine)
The trinuclear copper(II) complexes [Cu3(OH)(pz)3(Hpz)2Cl2]·solv (Hpz = pyrazole, pz = pyrazolate anion, solv = H2O or tetrahydrofuran) have been obtained by oxidation reactions of [{Cu(Hpz)2Cl}2]. When treated with pyridine(py), both CuII derivatives gave the related compound [Cu3(OH)(pz)3-(py)2Cl2]·py, which has bee…
Acoustic diagnosis of gas insulated substations: a theoretical and experimental basis
Loose particles and discharges inside the ducts of a gas-insulated substation (GIS) are considered hazardous to the insulation system. These irregularities or flaws can be detected by using acoustic sensors placed on the enclosure. An elementary review of sound propagation in a GIS together with corresponding experime…
Atomic mechanisms of mass transport in ceramic nuclear fuel materials
A critical review is given on self-diffusion, impurity diffusion, chemical diffusion, thermal diffusion and radiation-enhanced diffusion in the ceramic nuclear fuels, i.e. oxides, carbides, nitrides and carbonitrides of uranium and plutonium. Atomic transport in ThO2 is also discussed. Besides experimental results on…
Chromogenic materials for transmittance control of large-area windows
Chromogenic materials have optical properties that can be changed in a persistent and reversible manner under the action of an external stimulus. They can regulate the throughput of radiant energy between widely separated extrema, and hence they can be used in future “smart windows” in buildings, cars, etc., and for m…
Sedimentation dynamics and redox iron-cycling: controlling factors for the apatite—glauconite association on the East Australian continental margin
Abstract Detailed sedimentological and geochemical studies of phosphorites and sediments from the East Australian continental margin have shown that both apatite and glauconite are forming at a transition zone between relict, iron oxyhydroxide-rich, organic-poor (TOC<0.3%) outer shelf (200–350 m) sediments and relativ…
A Simulation of the Draping of Bidirectional Fabrics over Arbitrary Surfaces
The development of a graphical simulation to describe the draping of bidirectional fabrics over arbitrary surfaces is reported. The simulation applies to any surface, described either analytically or numerically, and allows any number of draped configurations on a surface. A unique draped configuration results when on…
Characterisation of cellulose treated by the steam explosion method. Part 1: Influence of cellulose resources on changes in morphology, degree of polymerisation, solubility and solid structure
Abstract Steam explosion treatment was carried out on almost pure natural celluloses (wood pulps and purified cotton linter) to obtain alkali‐soluble cellulose and to clarify the effect of cellulose resources on the changes in morphology, viscosity‐average degree of polymerisation P v , solubility towards aqueous alka…
Geometrische Größen und einfache Modellrechnungen für BO4-Gruppen
Most BO 4 -groups deviate significantly from a regular tetrahedron with symmetry [unk]3 m - T d . The geometry of these deviations and the extent of the distortions are the main topics of this study. The shapes of 256 borate groups in 128 compounds have been investigated. In BO 3 -groups with O … BO 3 distances shorte…
Structure of electron tracks in water. 1. Distribution of energy deposition events
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of electron tracks in water. 1. Distribution of energy deposition eventsSimon M. Pimblott, Jay A. LaVerne, A. Mozumder, and Nicholas J. B. GreenCite this: J. Phys. Chem. 1990, 94, 1, 488–495Publication Date (Print):January 1, 1990Publication History Published onlin…
Physicochemical properties of copper oxide loaded alumina in methane combustion
Copper oxide was deposited on gamma alumina with loadings between 2.1 and 9.2 wt % of CuO. The activity of these solids was measured in the catalytic combustion of methane before and after an aging test performed at 1340 K. The state and the environment of the copper species was followed by UV–VIS reflectance spectros…
The Strength of Microcrystalline Cellulose Pellets: The Effect of Granulating with Water/Ethanol Mixtures
Pellets were prepared by wet granulating with various ethanol/water mixtures utilizing the extrusion/marumerization process. Binary mixtures of 10% active ingredient and 90% Microcrystalline Cellulose (Avicel PH-101) were found to form pellets when granulated with 95% ethanol but not with absolute alcohol. Differences…
2,2-Dimethoxy-2-phenylacetophenone: photochemistry and free radical photofragmentation
Radical reactions induced by photocleavage of the photocuring agent 2,2-dimethoxy-2-phenylacetophenone in oxygen-free solutions are investigated by product Analysis, CIDNP, and by optical and ESR spectroscopy. It is shown that the photochemistry of the title compound is strongly influenced by both thermal and photoche…