Materials Literature
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Abstract An attempt is made to investigate the effects of varying the orientation of a quantizing magnetic field on the effective mass in tetragonal semiconductors. It is found, taking n‐Cd 3 As 2 as an example, that the crystal‐field splitting results in different effective masses at the Fermi level corresponding to…
Abstract The fluorescent states of tetratolylporphyrin and its zinc complex in acetone were quenched by various kinds of quinones. The transient effect for the collisional quenching caused the upward deviation of the plots of the inversed fluorescence intensities of the porphyrins vs the quinone concentrations. A char…
Results of immersion pitting, immersion crevice, and slow scan potentiodynamic pitting tests are compared to assess the relevance of particular types of accelerated laboratory tests for localized corrosion. The alloys examined include 317 L, 20-type alloys, duplex stainless steels, and nickel-base alloys. The solution…
The synthesis, solubility enhancement, and phase-transfer catalysis properties of cyclic poly(alkyleneoxy)silanes (silacrowns) I [R = R1 = Me; R = Me, R1 = Et, Ph, CH2:CH, MeO, H2NCH2CH2NH(CH2)3; n = 3-6] are described. Solubility enhancements of Li, Na, and K ions are a function of macrocycle and ion size. Phase-tran…
Abstract Weathering products of a serpentinized Iherzolite were investigated using optical microscopy, X-ray diffraction, infrared spectroscopy, and electron microprobe and wet-chemical analysis methods. The original mineral assemblage of the rock was chrysotile-enstatite-diopside-picotite-magnetite-calcite. Rock poro…
Treated cotton batting is examined as a substrate for cotton upholstered furniture. Evaluation of the smoldering hazard includes the tests proposed by UFAC and NBS, together with smoldering rates and surface temperature profiles obtained using the SRRC Rate Chamber. The influence of washing on the smoldering behavior…
CW laser fields are strong enough to induce a large refractive index change in a liquid crystal. Optical-field-induced structural transition can occur. The large optical nonlinearity can lead to some unusual highly nonlinear optical phenomena.
Summary The method of high‐resolution electron microscopy is applied to study the microstructure of the Sm–Ni intermetallic compound whose composition is near the Sm 5 Ni 19 . Several new polytypic structures (5T, 7T, 15R and 18R) are found and their crystal structures are analysed by high‐resolution imaging method co…
Abstract Stress corrosion cracking of poly(vinylidene fluoride) in sodium hydroxide solution is investigated. Poly(vinylidene fluoride) (PVDF) is embrittled in the presence of solutions of sodium hydroxide. Cracks developed in specimens of PVDF subjected to load and solution of NaOH. Reddish‐brown deposits appear befo…
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…