Materials Literature
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The effect of pressure on dc breakdown voltage of contaminated porcelain insulators and glass models was investigated in the range of 13 to 100 kPa. The study revealed that flashover voltage decreases nonlinearly with lowering of pressure. Arc characteristics under different pressure conditions were studied and the th…
The Warren–Averbach profile analysis was modified to study the deformed state of Al. The X-ray diffraction effect of dislocations locating on cell boundaries may be treated as `size broadening', while that of dislocations inside cells is `strain broadening', which may be treated with Wilkens's theory. X-ray Debye prof…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex formation in pyrosulfate melts. 1. Potentiometric, cryoscopic, and spectrophotometric investigations of the systems potassium disulfate-potassium sulfate and potassium disulfate-potassium sulfate-vanadium pentoxide in the temperature range 410-450.degree.CNiels Holge…
The first unambiguous evidence is presented that ${\mathrm{H}}^{\ensuremath{-}}$ ions are the main electron traps responsible for the long-lived phosphorescence observed at 2.3 eV near room temperature in thermochemically reduced MgO.
The elastic moduli and fracture toughnesses of a series of PbO‐ZnO‐B 2 O 3 glasses were measured for different PbO/ZnO ratios and for B 2 O 3 contents from 30 to 70 mol%. Substituting ZnO for PbO increased both the elastic modulus and fracture toughness at all B 2 O 3 levels with the fracture toughness being related t…
Abstract The number of commercial blends has skyrocketed in the past several years and the trend toward blending—in preference to the creation of new polymer structures—has been firmly established. This paper analyzes the reasons for this growth; the types of commercial products, their manufacturer, and their applicat…
The crystallization sequence and metasomatic alteration of spodumene (LiAlSizOe), montebrasite (LiAIPO4(OH,F)), and lithiophilite (Li(Mn,Fe)PO+) are described for nine zoned lithium pegmatites in the White Picacho district, Arizona. The observed crystallization trends suggest a progressive increase in the activities o…
Abstract Ten structurally different bisimide resins were prepared by reacting maleic anhydride/citraconic anhydride and benzophenone tetracarboxylic dianhydride with aromatic diamines and fused aromatic structures or heterocyclic groups. The amines included were 1,5‐diaminonaphthalene, 2,5‐bis( p ‐aminophenyl)1,3,4‐ox…
The sintering behavior of mullite powder compacts which contained soft and hard agglomerates was studied, The maximum density achieved depended on the size and packing of the agglomerates. Although the initial % total pore volume was kept constant, the presence of larger pores in the green compact, due to larger agglo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and bonding of the [Fe4(NO)4(.mu.3-S)2(.mu.3-NCMe3)2]n series (n = 0,-1) containing a cubane-like Fe4S2N2 core: stereochemical influence due to one-electron reduction of a completely bonding tetrahedral metal systemCynthia Ting Wah Chu, Robert S. Gall,…
Thin-film photodiodes with the graded-composition structures of amorphous Se–As–Te have been developed. The physical mechanism of the buit-in-field effect in these highly resistive photodiodes has been clarified. In order to realize complicated composition distributions, multi-layer evaporation technology has also bee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPatterns of three-liquid-phase behavior illustrated by alcohol-hydrocarbon-water-salt mixturesB. M. Knickerbocker, C. V. Pesheck, H. T. Davis, and L. E. ScrivenCite this: J. Phys. Chem. 1982, 86, 3, 393–400Publication Date (Print):February 1, 1982Publication History Publishe…
The excitation and emission spectra of YAl3B4O12 doped with Ce3+ and Bi3+ are reported. The Bi3+ emission spectrum at 4.2 K consists of a zero-phonon line associated with equidistant phonon sidebands. This emission is assigned to the P03→S01 transition. The intensity of the zero-phonon line is due to the mixing of the…
A homogeneous (planar) alignment of nematic liquid crystal on an optically uniaxial substrate, the optic axis of which is parallel to the surface plane, is considered. Based on the macroscopic theory of van der Waals forces, the contributions of the electrostatic dipolar forces and the dispersion force of the interfac…
Abstract The nature of Cu 2+ adsorption by boehmite, gibbsite, and noncrystalline alumina was studied over a range of equilibrium pH (4.5–7.5) and Cu 2+ concentration (10 −3 –10 −8 M) by electron spin resonance (ESR). Available chemisorption sites at pH 4.5 were the most numerous for noncrystalline alumina (~1 mmole/1…
Some four thousand years ago man discovered glass in the embers of a fire built somewhere in the deserts of the Near East. A few years from now ultratransparent glass fibers will be transmitting more information than copper wires. Thus glass is at once both one of the oldest and one of the newest materials known to ci…
The domain structure of a typical antiferroelectric substance, lead zirconate, is examined in detail fori the first time by electron diffraction and electron microscopy. The 90° and 60° domain configurations can be consistently understood on the basis of the pseudo-cubic unit cell. 180° domains, which are characterist…
A method is described for measuring the electrostatic charge generated in powders following contact with a plane substrate. The method uses a Faraday well connected to an electrometer and allows the specific charge of powders to be determined. Of the various drugs and excipients studied, most charged electronegatively…
We conducted chemical and clay mineralogical studies on Ando soils, Brown forest soils, and Podzolic soils that had been formed mainly from felsic Towada-a (1000 B.P.) and Chuseri (4000 B.P.) ashes under different climates and vegetation. Organic carbon accumulated remarkably in the humus horizons of all the soils and…
Phase diagrams for a model fcc binary alloy with first- and second-neighbor interactions are calculated in the tetrahedron-octahedron approximation of the cluster-variation method. The calculations are carried out for two values of the ratio of second- to first-neighbor pair interactions in the range of 0 to 0.5, wher…