Materials Literature
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Alloys with the composition Pr2(Fe1−xCox)17−yAly have been synthesized by the arc-melting technique followed by 125-h annealing at 900 °C in evacuated silica capsules. From room-temperature x-ray powder diffraction analysis a complete solid solution Pr2(Fe1−xCox)17−yAly has been observed for all values of 0≤x≤1 and 0≤…
A novel computer-aided optimizing procedure has been developed to obtain the geometry of the magnetic electron lens that give the minimum spherical aberration coefficient Cs. The minimization of Cs is done by a simplex method in which Cs is regarded as a function of up to 11 parameters characterizing the lens geometry…
Methods for producing large holographic diffraction gratings are described. In particular, the advantages of using a grating interferometer illuminated with a noncollimated beam from either an extended monochromatic source or an extended polychromatic source are described along with some of the problems that arise and…
Abstract Isocitric acid oxidative decarboxylation was realized in the absence and in the presence of homoionic Na + -, Mn 2+ -, and Cu 2+ -montmorillonite. The catalytic activity of the clay depends upon the nature of the interlayer exchangeable cation. Isocitric acid is transformed into α-ketoglutaric acid under the…
Boron nitride is a thermally stable and chemically inert material with a wide bandgap. As such, it has potential optoelectronic applications as windows, deep ultraviolet (UV) detectors, or UV light-emitting devices. Since it has a very high surface energy and a lattice parameter which is very similar to diamond, it ma…
The ThMn12-type Fe78Mo10Sm12 magnet has been characterized by high-resolution electron microscopy, x-ray microanalysis, and microdiffraction. In general, the microstructure of the mechanically alloyed and annealed magnets consists of the tetragonal 1:12 matrix phase with an average matrix grain diameter of 200–300 nm…
Oxidation of formaldehyde over supported platinum catalyst produced CO2 as a major product and CO as a minor product under a wide range of Inlet concentrations and reaction temperatures. The temporal variation of CO yield proceeded through a maximum suggesting that it was produced as an intermediate in the pathway lea…
Abstract A unified system of projection of chemical composition, prepared initially for micas and chlorites, has been applied to minerals of the serpentine-kaolinite group. It has been shown that the chemical composition in the projection field is controlled by the formula, the unit of which is: (Si (2- x ) Al x )O 5…
X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and low-energy electron diffraction (LEED) have been used to study the polar (111)Cd and (111)Te surfaces of intrinsic CdTe crystals. Complementary information on surface composition, chemical state of the surface elements, and surface structur…
The long term aging behaviour of a large number of Mo bearing and Mo free heats of cast duplex stainless steels has been studied between 300 and 450°C in terms of hardness and impact Charpy toughness. The results demonstrate the importance of the ferrite, Cr, and Mo contents in controlling aging response. Owing to the…
Abstract The crystal structure of the kaolinite mineral from Kalabsha, Aswan, Egypt, has been investigated with a two‐step procedure of the X‐ray powder pattern‐fitting. The unit cell is found to be triclinic, P1, a = 5.1577(15), b = 8.9417(23), c = 7.3967(40) Å, α = 91.672(5)°, β = 104.860(2) and γ = 89.898(2)°. The…
Metallic Sr 0.95 NbO 3 − δ is stable under normal electrochemical operation in 2.5 M H 2 SO 4 . It is, for practical purposes, inactive for fuel‐cell reactions and oxygen evolution, but it is active for the hydrogen‐evolution reaction with an exchange‐current density of 4.37 × 10 − 5 A cm − 2 at 60°C. An anomalous ano…
Abstract Many measurements have been made of the strength of simple vulcanizates of common elastomers, both under steady and intermittently applied loads. In both cases, the strength is governed by dissipative processes, particularly those arising from internal molecular motions and from stress-induced crystallization…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and circular dichroic and photoresponsive properties of a graft copolymer containing an azoaromatic polypeptide branch and its membraneMasato Aoyama, Akira Youda, Jun Watanabe, and Shohei InoueCite this: Macromolecules 1990, 23, 5, 1458–1463Publication Date (Print)…
The energy of formation of salt linkages between Arg or Lys with Asp or Glu in a polypeptide chain having the collagen fold have been estimated using the fully empirical energy minimization scheme AMBER. The polypeptide was considered both in an isolated and a hydrated triple helical state. The collagen fold associate…
Selection rules are derived for delimiting boundaries in the structural unit model of high-angle grain boundary structure. The rules arise from the condition that the structural units fit compatibly together in the boundary plane. Rules are given for pure twist, pure tilt and mixed tilt and twist trajectories in the f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic states of chrysene: linear and magnetic circular dichroism and quantum chemical calculationsJens. Spanget-Larsen, Jacek. Waluk, and Erik W. ThulstrupCite this: J. Phys. Chem. 1990, 94, 5, 1800–1806Publication Date (Print):March 1, 1990Publication History Published…
Outgassing characteristics of an electropolished stainless steel (304) pipe wall were investigated by an isolation method. The free outgassing rate after an in situ bakeout (150 °C, 20 h) was estimated as low as 1.6×10−12 Pa ℓ s−1cm−2. After the in situ bakeout, H2 molecules were steadily evolved from the pipe wall, w…
Polymer films containing nematic liquid crystal microdroplets are useful for light modulation devices. Light scattering in these films is controlled by applied electric fields. These films were produced by cooling solutions of polymer in the isotropic phase of liquid crystal to temperatures below the clearing point (t…
Problem 12 of the TEAM (Testing Electromagnetic Analysis Methods) Workshops for Eddy Current Code Comparison is a cantilever beam in crossed steady and time‐varying magnetic fields. A total of six solutions to this coupled problem are described and compared with experimental results. Most solutions treated the electro…