Materials Literature
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Effect of ambient temperature simulating different weather conditions has been investigated on insulators of different shapes. It has been observed that for a given salinity of contaminating solution, the amount of salt contained in the contaminated-surface layer is strongly temperature dependent. This is attributed t…
The changes in structure and dielectric properties of some phosphates of the family NanM2(XO4)3 with the change of their temperature strongly suggest the existence of new kind of phase transitions: ferroelectric-superionic conductor and antiferroelectric-superionic conductor.
The effects of forming pressure and sintering temperature on shrinkuge, density, and phase composition of α‐ and β‐SiC were determined. Alpha SiC developed the 4H phase at the expense of the 6H phase at >2150°C. The beta form converted to the 6H phuse at >2000°C, with intermediate development of the 15R and 4H p…
An experimental study of water penetration into a hot particle bed has been conducted. The pattern of water penetration was found to be complicated due to the formation of dry pockets and channels. Overall, the water penetrates down the bed as a single column in the central region, while the annular region near the wa…
Sodium depth profiles were determined in water‐leached glass samples with molar composition 20Na 2 O · 10RO · x Al 2 O 3 · (70 ‐ x)SiO 2 (RO = CaO, MgO, and ZnO) using secondary ion mass spectrometry. The leaching of sodium ions decreases with increasing Al 2 O 3 content in all three glass systems. For x = 0 the leach…
Abstract The contribution of jute constituents, namely, water soluble matters, waxes, pectins, lignin, hemicelluloses, and α‐cellulose in the graft copolymerization reaction of jute fabric with some vinyl monomers was investigated. Styrene, methylmethacrylate, and acrylonitrile were used as the monomers and Fe 2+ /H 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-exchange rate for the copper(II)/copper(I) couple complexed to TAAB, an N4 macrocycleElizabeth J. Pulliam and David R. McMillinCite this: Inorg. Chem. 1984, 23, 8, 1172–1175Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published ini…
E ′ 1 (bridging oxygen vacancy) defect densities have been measured in thermal SiO2 films implanted with ions having various energies and masses. From a plot of the defect production per unit volume versus energy deposited into elastic processes per unit volume we observe a linear slope yielding one E1 defect per 2000…
Abstract : Hydrogen can react with heterogeneities in the microstructure of ferrous alloys. These interactions create the necessary sub-steps for failure - crack or void initiation. The nature and type of interactions of hydrogen with the microstructure, combined with the concept of a critical hydrogen concentration f…
The system CaxSr8-x[Al12O24](WO4)2 has been studied with the view or elucidating the role of cage cation substitution on the phase transition behaviour. Room temperature Guinier photographs show splitting and extra reflections indicating structural variations from orthorhombic through tetragonal to cubic symmetry. DSC…
An experimental study concerning the shock wave—bubble interaction was conducted in order to obtain a unified consideration of the mechanism of the impulsive pressure generation induced by the cavitation bubble collapse. It was found that the relation between the maximum impulsive pressure, p G, max , and the relative…
Ca(BH 4 ) 2 ·2(CH 3 OCH 2 CH 2 OCH 3 ) 2 , (1) has been prepared from Ca(BH 4 ) 2 ·2 THF by ligand displacement. IR and NMR data are in agreement with the presence of a nonionic BH 4 group, but a specific binding to calcium could not be deduced unambiguously. However, the X-ray structure analysis of a single crystal o…
Ceramics of Pb(FeNb)0.5O3 have been prepared by the usual sintering technique and are characterized by X-ray diffraction, electrical measurements and scanning electron microscopy. Neutron powder diffraction data of the ceramics were collected at room temperature and at - 183°C and refined using the Rietveld technique.…
Abstract Novel furan‐based diisocyanates ( 2a – c ) were reacted with 1‐butanol and basic kinetic studies were made. The results were compared with those obtained from 4,4′‐methylenediphenylene diisocyanate ( 1 ) under similar conditions. The kinetics of these model reactions were found to be complex even in the prese…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalytical and structural analysis of the lanthanum-deficient lanthanum hexaborideMichael J. McKelvy, L. Eyring, and E. K. StormsCite this: J. Phys. Chem. 1984, 88, 9, 1785–1790Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inis…
The particle structure of polyvinyl chloride is controlled by the shear field imposed on the monomer droplet and the interfacial behavior of the vinyl chloride/water phases during polymerization. The inter facial tension in the presence of hydroxypropyl methylcellulose (HPMC) was measured as a function of concentratio…
Quercetin suppressed singlet molecular oxygen-dependent photobleaching of crocin in the presence of rose bengal as a photosensitizer. The suppression by quercetin concurred the transformation of quercetin to a compound which had an absorption maximum at about 330 nm. The rate of the transformation was slowed down by a…
n‐ and p‐type single crystals have been grown by the Bridgman‐Stockbarger method and characterized by their electronic transport properties. A photoelectrochemical study in aqueous media using the cleavage surface shows rectifying behavior in the dark, confirming diode behavior for both. electrodes exhibit anodic and…
The effect of high energy electron radiation on TFE copolymers of perfluoro(methyl vinyl ether) (PMVE) and perfluoro-3,6-dioxa-4-methyl-7-octene sulfonyl fluoride (PSEPVE) was studied. The PMVE copolymers were found to crosslink when irradiated as either a gum or as a compounded elastomer. Attempts to graft vinyl mono…
Abstract Crystallization of poly(tetrafluoroethylene) was observed by differential scanning calorimetry at constant cooling rates. A method for kinetic analysis of thermoanalytical data of nonisothermal crystallization was applied to analyze the data, and it was elucidated that poly(tetrafluoroethylene) crystallizes o…