Materials Literature
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Crystal structure refinement was carried out on a defect spinel with composition Mg 0.388 Al 2.408 O 4 synthesized at 2050°C Combining information from site occupancies and bond distances for tetrahedral and octahedral sites, the following cation and vacancy distribution were obtained: (Al 0.653 Mg 0.347 )(Al 1.755 Mg…
Checa, A. 1991 01 15: Sectorial expansion and shell morphogenesis in molluses. Lethaia. Vol. 24, pp. 97–114. Oslo. ISSN 0024–1164. Any coiled shell can be described as a series of independent helicospirals that join homologous points along the shell surface. The cross-section is therefore seen as a set of points. obta…
The adsorption and the surface reactions of ammonia and nitric oxide on differently pretreated Ru/TiO2 samples have been investigated by means of FTIR spectroscopy. On all the samples, both oxidized and reduced, the ammonia is adsorbed at room temperature in an undissociated form on different Ti4+ surface ions, (at co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism and stereochemistry of .alpha.,.beta.-dihydroxyacid dehydrataseMichael C. Pirrung, Christopher P. Holmes, Daniel M. Horowitz, and David S. NunnCite this: J. Am. Chem. Soc. 1991, 113, 3, 1020–1025Publication Date (Print):January 1, 1991Publication History Published…
The impact of nonlinear loads on anisotropic transformers is investigated. The saturation of the iron-core materials, the anisotropy of the with and cross-grain laminations, the dependency of the iron-core losses on the amplitudes of, the fundamental and harmonics of the flux density, and the dependency of the iron-co…
A number of reviews have been published detailing the chemical and physical properties of silkworm silks 1–6 and the genetics of silk production in the silkworm 7–9 . Here we overview some of the key chemical and physical properties of both silkworm and spider silks, and then review the genetic aspects of silk product…
Development of highly conductive materials with high strength is requisite for conductors of high field magnets. To develop such materials, the Cu-Ag alloys (2-60 at%Ag) and their fabrication methods have been investigated. This paper describes the mechanical and electrical properties as well as the microstructure of…
INCONEL@ alloy 625 is a nickel-chromium-molybdenum alloy that is used for its high strength, excellent fabricability and weldability, and outstanding corrosion resistance. The outstanding and versatile corrosion resistance of INCONEL alloy 625 under a wide range of temperatures and corrosive environments is the primar…
Nonlinearity in the internal self-impedance of railroad rail can give rise to power frequency harmonics in traction systems. Limiting case analytical models of rail impedance, based on linear complex permeability and complete saturation, are compared with measurements for currents to 800 A and frequencies to 10 kHz. T…
Chloroform solutions of medical grade silicone resin were cured in an aqueous dispersion medium containing poly(vinyl alcohol) (PVA) as the drop stabilizer at 40-60 degrees C to generate smooth, spherical, elastic microspheres. The microspheres were encapsulated with tantalum powder to render them radiopaque. Tantalum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of metal oxo alkyl complexes. Mechanistic studies on the anaerobic and aerobic decompositions of molybdenum(VI) dioxo dialkyl complexesWilliam M. Vetter and Ayusman SenCite this: Organometallics 1991, 10, 1, 244–250Publication Date (Print):January 1, 1991Publicatio…
The absorption and emission spectral properties of a series of meso-substituted octaethylporphines and their zinc complexes have been investigated. Changes in electronic absorption spectra induced by the substituents can be explained by Gouterman's ‘four-orbital’ model. In order to account fully for the effect of the…
The six-co-ordinate iron(III) complexes [Fe(bzpa)2]ClO4(Hbzpa =(1-benzoylpropen-2-yl)(2-pyridyl-methyl)amine] and [Fe(acen)(NC5H3Me2-3,4)2] BPh4[H2acen = ethylenebis(acetylacetoneiminate)] have been shown by variable-temperature magnetic and Mössbauer spectroscopy measurements to be spin-crossover (S=5//2; ⇌S=½) compl…
Abstract We review Charpy impact testing at extreme cryogenic temperatures, especially at liquid helium temperature (4 K), considering methods of testing and calibration, thermal behavior during the various stages of testing, and correlations between Charpy absorbed energy and quantitative toughness parameters. Becaus…
The corrosion behavior and mechanism of matrix resins for FRP in aqueous solutions were investigated, comparing these with the corrosion of metals. Three forms of corrosion were found, namely surface reaction type, corrosion layer forming type and penetration type. In surface reaction type corrosion, which was recogni…
A modified Friedel–Crafts synthesis has been used to make a variety of aromatic ether–ketone–‘X’(EKX) polymers. The ‘X’ groups incorporated were: imide, amide, sulphone, ester, azo, quinoxaline, aliphatic, fluoroaliphatic and fluoroaromatic. Some properties of these EKX polymers are reported and discussed.
A theory is presented for supersolidus liquid phase sintering. It is assumed that densification is by a viscous flow process involving the formation of liquid films along the interfaces in polycrystalline, prealloyed particles. The rigidity of the particle is determined by the percolation threshold where structural in…
The effect of thermo-mechanical treatment on the shape memory characteristics in a Ti-40Ni-10Cu (at%) alloy has been investigated by means of electrical resistivity measurement, differential scanning calorimetry, X-ray diffraction and the thermal cycling test under constant load. The following results are obtained. (1…
Hot deformation of 7075 aluminum alloy was studied in compression in the temperature range of 723 to 803 K and at constant true strain rates from 5.4×10−6 to 0.8 s−1. The flow characteristics were classified into three types and analyzed in each region of testing conditions, as follows; L, M, and H. In region H where…
The PALLAS (discrete ordinates-integral transport) code was improved to include secondary sources, such as bremsstrahlung and fluorescence, to assure accurate and reliable results. The point buildup factors for high-Z materials were calculated with this code in the energy range of 0.015~15 MeV up to 40 mean free paths…