Materials Literature
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In this paper a dynamic model of ac source-insulator interaction during the critical arcing period of polluted high-voltage insulators is developed. The simulation accounts for arc dynamics, arc motion over the contaminated insulator surface, dielectric recovery and restrikes as well as the most relevant parameters of…
Abstract Droplets with different sizes scatter light at different wavelengths. A droplet size index (R) was developed for predicting emulsion stability and absorbance of light at 660 nm was used to evaluate the opacity of the system. Various cloudy agents were tested on both stability and cloudiness of emulsions. The…
Abstract The blue colored complex between poly(vinyl alcohol) (PVA) and iodine was prepared at 5°C by mixing an aqueous solution of PVA with an aqueous ethanolic solution of iodine containing boric acid. The absorption spectrum of the system shows bands at 226 nm (A), 290 nm (B), 355 nm (C), and 650 nm (D). Their rela…
The chemical interaction between solid and liquid Zircaloy-4 and solid UO2 was examined in the temperature region 1000 to 2000°C in argon. The solid/solid reaction experiments were performed with short light water reactor fuel rod sections with an external pressure of 1 to 80 bar. The annealing times varied between 60…
Als bisher größter CuS‐Cluster nimmt [Cu 12 S 8 ] 4⊖ eine Sonderstellung ein. Er ist der erste isolierte Kupfer(I)‐Komplex mit ausschließlich sulfidischen Liganden. Das Ph 4 P‐Salz bildet sich bei der Umsetzung von CuCl 2 ·2 H 2 O mit EtS ⊖ und Li 2 S in Gegenwart von Ph 4 PBr. magnified image
Studies have been made of the polarization and depolarization behavior for lead lanthanum zirconate titanate ceramics with zirconia: titania ratio 0.65/0. 35 and La2O3 content from 0.07 to 0.095 (7:65:35 to 9. 5:65:35). Continuity of the dielectric dispersion on cooling unbiased freshly de-aged samples suggests that a…
Anharmonic thermal vibrations of atoms in MgA120 4 spinel (Fd3m, Z = 4) have been studied using sets of accurate X-ray diffraction intensities of Bragg reflections at temperatures up to 1933 K. The study was initiated by refining the temperature factor T(Q) of each atom in the form of the second-rank tensor/3~j, the e…
The domain structure of BiFeO3 has been studied by transmission (4–800K) and reflection (300–1100K) microscopy. The rhombohedral phase transforms at ∼ 1083K to a non-cubic twinned phase, stable up to the decomposition at 1185K. Owing to a strong negative temperature shift (∼ -5. 9 cm-1K-1) of an absorption edge BiFeO3…
The effects of the compositional ordering on the properties of Pb2ScNbO6 and Pb2InNbO6(PIN) crystals were studied. For PIN an order-disorder transition temperature of 1010°C is yielded.
In recent years, as the need for detailed information about energy deposition in subcellular size sites has become apparent (e.g. Cox et al. 1977, Kellerer et al. 1980). considerable effort has been devoted by several groups with the aim of producing realistic Monte Carlo 'event by event' transport codes for low-energ…
An ion beam deposition system has been used to deposit thin films of carbon with many diamondlike properties [S. Aisenberg and R. Chabot, J. Appl. Phys. 42, 2953 (1971)] which were subsequently confirmed by others [E.G. Spencer, P. H. Schmidt, P. C. Joy, and F. J. Sansalone, Appl. Phys. Lett. 29, 118 (1976)]. Included…
Abstract Ru/Al2O3 catalysts prepared from [Ru3(CO)12] and from RuCl3 were characterized by chemisorption of H2 and CO, and by infrared measurement of adsorbed CO. By using these catalysts, the effect of the dispersion on the activity and selectivity in CO hydrogenation was studied. Ru/Al2O3 catalysts prepared from [Ru…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray absorption studies of some platinum oxidesA. N. Mansour, D. E. Sayers, J. W. Cook Jr., D. R. Short, R. D. Shannon, and J. R. KatzerCite this: J. Phys. Chem. 1984, 88, 9, 1778–1781Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThin-film models of strong metal-support interaction catalysts. Platinum on oxidized titaniumD. N. Belton, Y. M. Sun, and J. M. WhiteCite this: J. Phys. Chem. 1984, 88, 9, 1690–1695Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published…
Abstract Furan‐based diisocyanates and diamines were prepared unambiguously as potential monomers for polyurethane and polyamide production, starting from methyl furoate and furfurylamine, respectively. The syntheses were optimized and the product identity was confirmed by elemental analysis, IR and NMR spectroscopy,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized electronic spectra of dirhodium(II) tetraacetateVincent M. Miskowski, William P. Schaefer, Behzad Sadeghu Sadeghi, Bernard D. Santarsiero, and Harry B. GrayCite this: Inorg. Chem. 1984, 23, 8, 1154–1162Publication Date (Print):April 1, 1984Publication History Publi…
Like many other eubacteria, cultures of Escherichia coli accumulate cyclopropane fatty acids (CFAs) at a well-defined stage of growth, due to the action of the cytoplasmic enzyme CFA synthase. We report the isolation of the putative structural gene, cfa, for this enzyme on an E. coli-ColE1 chimeric plasmid by the use…
The densification of alumina powders prepared to have a bi‐modal particle‐size distribution with a coarse‐to‐fine particle‐size ratio of ≊ 10 can be predicted to a first approximation if the densification of the fine and coarse powders is known. Deviations from model prediction were attributed to compositional heterog…
Most transition-metal magnets, although itinerant in nature, do not undergo large volume contractions on passing from the magnetic to the non-magnetic state. Such a contraction might be expected because of the very large internal magnetic pressure which has been calculated to exist in these magnets at zero temperature…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew approach to the problem of elastic scattering from a mixture of homopolymers in a concentrated solutionHenri Benoit and Mustapha BenmounaCite this: Macromolecules 1984, 17, 4, 535–540Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Publ…