Materials Literature
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Hydrogen diffusivity and solubility in pure solid aluminum were measured in a high temperature range from 573 to 923 K, by means of a desorption technique, which was an outgassing study from thermally hydrogen-charged cylindrical samples with various grain sizes. The diffusion coefficient depended linearly upon an inv…
Abstract
Abstract The solubilization of silicates was investigated using kaolin and quartz sand as model substances. The mineral solubilization was studied in the concentration of solubilized Si and Al. The chemical leaching of the silicates was carried out using inorganic and organic acids as well as sodium hydroxide. The pro…
Poisson's ratio of cow teat skin was measured uni- and biaxially and shown to be anisotropic and dependent on aspect ratio. At strains below 0.1 (where Cauchy and Hencky strain are indistinguishable) the Poisson's ratio of cow teat skin measured biaxially is very much greater than 1.0, whereas the Poisson's ratio of d…
The decoction of the aerial part of Calotropis procera is commonly used in Saudi Arabian traditional medicine for the treatment of variety of diseases including fever, joint pain, muscular spasm and constipation. The present investigation was undertaken to confirm its claimed activity in traditional medicine. The etha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopy of calcium phosphate glasses with varying calcium oxide modifier concentrationsJeanne E. Pemberton, Lida Latifzadeh, Joseph P. Fletcher, and Subhash H. RisbudCite this: Chem. Mater. 1991, 3, 1, 195–200Publication Date (Print):January 1, 1991Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResolution and analysis of the components in dual emission of mixed-chelate/ortho-metalate complexes of iridium(III)Ashley P. Wilde, Kevin A. King, and Richard J. WattsCite this: J. Phys. Chem. 1991, 95, 2, 629–634Publication Date (Print):January 1, 1991Publication History P…
An efficient method allowing the transformer flux offset and exciting-current waveform to be determined for combined AC and geomagnetically induced current (GIC) excitation, without lengthy time-domain simulations, is described. This iterative approach solves for the equilibrium saturation condition using lumped-param…
A mercury ultramicroelectrode (Hg-UME) has been prepared by electrochemical deposition of mercury on an iridium substrate. The iridium UMEs can be prepared with radii of l-20 pm using a molten salt etching solution of NaCl and NaNOs. The Ir and Hg UMEs have been characterized by cyclic voltammetry and chronoamperometr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecomposition of ozone on a silver catalystSeiichiro Imamura, Masaaki Ikebata, Tomoyasu Ito, and Takashi OgitaCite this: Ind. Eng. Chem. Res. 1991, 30, 1, 217–221Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January…
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Heteropolyanions [WM3(H2O)2(XW9O34)2]12–(X = M = Zn or CoII) form on ageing concentrated solutions of sodium salts of the well known polyanions [Zn(H2O)(ZnW11O39)]8– and [CoII(H2O)(CoIIW11O39)]8–. Their high-yield syntheses are reported. An X-ray crystallographic study of Na12[WZn3(H2O)2(ZnW9O34)2]·46H2O [Space group…
1. Introduction (F.N. Cogswell). The keys to thermoplastic composites. Envoi. Bibliography. 2. Physical and mechanical properties of high-performance thermoplastic polymers and their composites (N.J. Johnston, T.W. Towell, P.M. Hergenrother). General features of thermoplastic matrices. Neat resins and properties. Comp…
An electroactive polymer with a lowered band gap has been obtained from the monomer cyclopenta[2,1-b;3,4-b′]dithiophen-4-one.
An electroactive polymer with a bandgap of ≈0.8 eV has been obtained from the monomer 4-dicyanomethylene-4H-cyclopenta[2,1-b;3,4-b′]dithiophene.
Recent studies of self-diffusion and impurity diffusion in α- and β-titanium are reviewed. The transition metal elements and phosphorus exhibit fast diffusion in α-Ti, which are three to five orders of magnitude faster than the self-diffusion. The mechanism of the fast diffusion is discussed on the basis of the severa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLayered structure of crystalline compounds silver thiolates (AgSR)Ian G. Dance, Keith J. Fisher, R. M. Herath Banda, and Marcia L. ScudderCite this: Inorg. Chem. 1991, 30, 2, 183–187Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of quantum-size semiconductor particles in a layered metal phosphonate host latticeGuang Cao, L. K. Rabenberg, Christine M. Nunn, and Thomas E. MalloukCite this: Chem. Mater. 1991, 3, 1, 149–156Publication Date (Print):January 1, 1991Publication History Published o…
The hydrothermal synthetic conversion of aluminium-rich zeolites to organo-zeolites in the presence of N,N,N-trimethyl-1-adamantammonium cations is now extended to the faujasite system. Rates of conversion are seen to be dramatically affected by various treatments of the FAU (faujasite) zeolites. Rates are depressed b…
Two novel, simple control strategies for current-controlled pulse-width modulated (PWM) transistor inverters are presented. Both methods are based on the three-level hysteresis comparators which select appropriate inverter output voltage vectors via a switching electrically programmable read-only memory (EPROM) table.…