Materials Literature
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Under fluid film lubrication, the particulate contaminants in the fluid cause three-body abrasive wear on critical surfaces. The wear not only depends on the hardness of the wearing surface (Hj), but also on the hardnesses of its opposing surface (Hb) and the involved abrasives (Ha). In this paper, the hardness effect…
Arg252 of fructose-6-phosphate 1-kinase (PFK) from Bacillus stearothermophilus has been proposed to be involved in the binding of the substrate Fru-6-P. We demonstrate here that mutation of this residue to alanine converts the enzyme to a form with characteristics similar to those of its allosterically tight form. The…
Kerogen maturation, estimated from pyrolysis Tmax values is compared with the smectite laayer‐content of the illite/smcetite mineral derived from sediments in six suites from different basins with different ranges of statographic age. The most significant correlations are made when camparing Tmax and estimated percent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacteristics of radioactive particles released from the Chernobyl nuclear reactorRichard G. Cuddihy, G. L. Finch, G. J. Newton, F. F. Hahn, J. A. Mewhinney, S. J. Rothenberg, and D. A. PowersCite this: Environ. Sci. Technol. 1989, 23, 1, 89–95Publication Date (Print):Janu…
La molécule sonde CO est utilisée pour évaluer l’importance relative des faces (100) et (111) ainsi que des discontinuités pour des catalyseurs 0,45 % Pd/Al2O3 de dispersion comprise entre 9 % et 51 %. Le coefficient molaire d’extinction intégré de la vibration v(CO) est mesuré pour un environnement intermoléculaire s…
The influence of the composition of Zircaloy-type alloys has been evaluated previously with respect to mechanical properties (1973 International Conference Zirconium in the Nuclear Industry, ASTM STP 551) and to nodular corrosion (1985 International ASTM Conference on Zirconium in the Nuclear Industry, ASTM STP 939).…
The author presents the results of measurements of the effect of uniaxial tensile stresses of up to 85 MPa on Barkhausen activity and magnetic properties of AISI 4130 and AISI 4140 steels. The results show that maximum Barkhausen activity occurred very close to the coercive point. The Barkhausen peak height and the to…
Energy functionals for the Preisach hysteresis operator are used for proving the existence of weak periodic solutions of the one-dimensional systems of Maxwell equations with hysteresis for not too large right-hand sides. The upper bound for the speed of propagation of waves is independent of the hysteresis operator.
John J. Lee, M. E. McEnery, B. Ter Kuile, J. Erez, , R. F. Rockwell, W. W. Faber Jr., A. Lagziel, Identification and Distribution of Endosymbiotic Diatoms in Larger Foraminifera, Micropaleontology, Vol. 35, No. 4 (1989), pp. 353-366
Abstract
CB15/E9 mixtures submitted to an electric field exhibit a tetragonal phase BPX, having a D10 4(I4122) symmetry and two hexagonal phases BPH3d and BPH2d The Kossel diagram technique allows us (a) to confirm the hexagonal symmetry of BPH3d and to determine precisely its space group D2 6 (P6222) and (b) to study the fiel…
Abstract The oxidation of maltodextrins and starch with aqueous alkaline sodium hypochloride has been studied. At an oxidant level of 3 moles hypochlorite per anhydroglucose unit at pH 8–9, a C2, C3‐glycol‐cleaved dicarboxy polysaccharide was obtained containing up to 45% ring‐opened glucose units. Hydrolysis of the o…
Intrinsic coercivities as large as H/sub ci/=7.8 kOe were obtained in Sm-Fe-V alloys magnetically hardened by melt-spinning. As-quenched Sm/sub 0.87/Fe/sub 10/V/sub 2/ ribbons melt-spun at a substrate velocity of 20 m/s have an intrinsic coercivity H/sub ci/=6.9 kOe and remanence B/sub r/=5.1 kG. The Curie temperature…
Ultrafine, nearly spherical particles of CoFe/sub 2/O/sub 4/ were prepared under mild hydrothermal conditions. These ferrite particles were found to be superparamagnetic with a narrow particle size distribution in the range 10.0-40.0 nm. The hydrothermal ferrite powders could be sintered to almost theoretical density…
Measurements of thermal conductivity on conventional and newly developed electronic ceramics are presented as part of an effort to incorporate the new high-thermal-conductivity ceramics into microcircuit manufacturing. Motivated by large variations in values claimed by different vendors for ostensibly similar material…
The preparation, X-ray crystal structures, conductivities, and preliminary spectroscopic characterization of new charge transfer salts of general formula (D)32+ P2–, where D is an organic donor and P hexatungstate (or molybdate) acceptor dianions having the Lindquist structure, are given.
Abstract Pedogenic calcite‐crystal coatings on clasts were examined in four soils along an altitudinal gradient on Kyle Canyon alluvium in southern Nevada. Clast coatings were studied rather than matrix carbonate to avoid the effects of soil matrix on crystallization. Six crystal sizes and shapes were recognized and d…
The effect of deformation-induced martensite on the tensile behavior of metastable austenitic stainless steel has been investigated on a AISI Type 301 stainless steel containing a small amount of copper using the X-ray diffraction technique and transmission electron microscopy. The formation of martensite during tensi…
An α-unsaturated ketone and acetone undergo a selective coupling to an α-unsaturated vic-diol, under the influence of a zinc–copper couple and ultrasonic irradiation in aqueous acetone suspension.
Supported reagents prepared by adsorption of chromium(VI) and manganese(VII) on alumina are capable of catalysing the aerial oxidation of organic substrates.