Materials Literature
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The precipitation of phosphate is an important problem in both scale formation and corrosion inhibition. The formation of zinc phosphate barrier films in the latter case is a well-known technique, but the mechanism of the process is still poorly understood. Calcium phosphate phases which precipitate in solutions conta…
The effect of pressure (up to 80 kbars) on the electrical conductivity of a series of fast-ion conducting AgI–Ag2O–MoO2 glasses has been investigated. The results are consistent with a cluster model.
Abstract The history of important developments in the theory of hybrid bond orbitals and its application in valence‐bond theory is reviewed. One of the salient points, the bond strength of a hybrid orbital, is defined as the value of the angular part of the orbital along the bond direction. Characteristic bond angles…
ABSTRACT Acid pore waters generated within organic-rich muds destabilize carbonates and aluminosilicates and take metals, including aluminum, into solution. Sediment compaction forces some of these modified pore waters into sandstones. Once isolated from the principal source of acidity (kerogen maturation), the pH of…
The solid sodium electrolyte β″‐Al 2 O 3 (Li‐stabilized) was strengthened with additions of tetragonal ZrO 2 (15 vol%). The conductivity of this composite material, measured in an Na/Na cell, was 7.7 Ω· at 300°C. Average values of strength and the critical stress intensity factor were 350 MPa and 4.5 MPa·m 1/2 , respe…
The paper summarizes the results of clean-fog tests conducted by eleven task force laboratories on a common suspension insulator, IEEE insulator. The test series done according to a specific set of guidelines, show considerable dispersion in the fifty per cent flashover voltage between the laboratories. The significan…
Abstract The mechanism of flame retardant (FR) action of red phosphorus in polyacrylonitrile combustion was investigated by thermogravimetry, flash‐pyrolysis GC‐MS, and combustion methods. Red phosphorus was found to increase the thermal stability in air of polyacrylonitrile and to induce a char residue increment on t…
Abstract Mineralogical properties of soils along a 500 km east‐west transect of an eastern province of Saudi Arabia were examined. Mineralogical composition of soils along the eastern coastal playa near Al Qatif is mostly gypsum or calcite in the whole soil, and smectite among layer silicate minerals in the clay fract…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect thermal and photochemical generation of silanonesGregory Hussman, William D. Wulff, and Thomas J. BartonCite this: J. Am. Chem. Soc. 1983, 105, 5, 1263–1269Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1 March 19…
Extended cycle lengths and fuel burnups are receiving increased attention. Frequently, the attendant fuel management strategies in pressurized water reactors (PWRs) require burnable poison shims to control power distribution and to maintain a negative moderator coefficient. High energy (∼450 effective full-power days)…
Grain-boundary hardening of oriented niobium bicrystals with symmetric tilt boundaries has been determined using microhardness measurements. The boundary hardening was found to be misorientation-dependent and related to the boundary energy. For bicrystals with low-angle boundaries, the hardening varies with misorienta…
Auger electron spectroscopy and secondary ion mass spectrometry, in conjunction with ion sputtering, have been used to demonstrate that chloride is incorporated in anodic oxide films formed on nickel in Cl − ‐containing, p H 4.0 solutions. X‐ray photoelectron spectroscopy indicates that this chloride is present as Cl…
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In the presence of NAD', tyrosine inhibits both activities of the bifunctional enzyme chorismate mutase/ prephenate dehydrogenase (EC 5.4.99.5/1.3.1.12).The maximal inhibition in the presence of 0.5 m~ NAD' and 0.15 l z l ~ concentration of the other substrate was 45% and 95% for the chorismate mutase and prephenate d…
We have developed a simple method for calculating the ionospheric photoelectron flux that uses the concept of average electron energy loss to simplify the calculation of the degraded electron spectrum. This method, which requires only a knowledge of the total inelastic electron impact cross sections, rather than a det…
The surface of a solid insulator in vacuum (and in a high gas pressure) becomes electrically charged when subjected to a high voltage stress. The surface charge density is proportional to the applied voltage. The magnitude of the surface charge density depends on the secondary electron emission characteristic, the geo…
Using a dialysis culture system for marine algae which allows for the recovery of high cell yield, we detected in the aqueous phase of the algal extracts an active component which inhibited gram-negative bacteria. Results show a direct relation between cell growth phase at time of harvest and the activity observed. It…
L-Arginine acetate crystallizes in the monoclinic space group P2(1) with a = 9.229(2), b = 5.178(3), c = 13.271(4) A and beta = 111.4(1) degrees. The crystal structure was solved by direct methods and refined to an R value of 0.058 for 1333 observed reflections. The conformation of the arginine molecules in the crysta…
Diffraction of a two-dimensional electromagnetic beam wave by a thick slit pierced in a perfectly conducting screen is studied, based on Maxwell’s equations and their associated boundary conditions. The incident field is not a plane wave but a more-realistic beam. Special attention is devoted to the numerical aspect,…
Abstract By considering reaction and diffusion through a product layer and concomitant movement of pore and reaction surfaces, a general rate equation is derived for fluid‐solid reactions. Application to the random pore model extends the prior results (Bhatia and Perlmutter, 1980, 1981a) to account for nonlinear conce…