Materials Literature
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Polycrystalline samples of non-centrosymmetrical enantiomorphic materials may be considered as two-phase materials consisting of a right-handed and a left-handed phase, each of which has its own texture. Centrosymmetrical crystals may be considered as right- or left-handed at the same time. If the right- and left-hand…
Water treeing is a well known fracture phenomenon in polyethylene (PE) and crosslinked polyethylene (XLPE) high voltage cable insulation. We studied two phenomena: (1) The insulation material is mechanically fatigued by electrostriction as is shown by measuring the relevant electrostriction constant, which moreover is…
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A literature survey on the mechanisms of water-treeing electrical cables is presented. The survey provides an introduction, some background, and examples of current research on water-treeing mechanisms. The mechanisms of water-treeing have been broken into three categories: chemical, electrical, and mechanical. Along…
In mammals, a trifunctional protein (ME pyr1-32) synthesizes L-5,6-dihydroorotate in three sequential reactions catalyzed by carbamyl phosphate synthetase (EC 2.7.2.9), aspartate transcarbamylase (EC 2.1.3.2), and dihydroorotase (EC 3.5.2.3). 14C-labeled HCO3- has been used as a precursor for the synthesis of L-5,6-di…
Ca10(PO4)6CO3 is an `apatite' with pseudo-hexagonal symmetry with monoclinic space group Pb and lattice constants a = 9.557 (3) A, b ≃ 2a, c = 6.872 (2) A and γ = 120.36±0.04°.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxoanion-supported metal carbonyls: syntheses of the [(OC)3M(Nb2W4O19)]3- anions (M = rhenium and manganese)C. J. Besecker and W. G. KlempererCite this: J. Am. Chem. Soc. 1980, 102, 25, 7598–7600Publication Date (Print):December 1, 1980Publication History Published onlin…
Various methods of thermogravimetric analysis were compared in case of polystyrene degradation. The reaction order, the activation energy and the preexponential factor were evaluated from common TG curves experimentally obtained. In most cases a 5-mg sample of polystyrene with 110,000 molecular weight was decomposed a…
High mobility group (HMG) protein 14, which, like HMG-17, has been implicated in the structure of 'active chromatin' is shown by 270-MHz NMR and by circular dichroism to be in a disordered conformation in free solution. At low ionic strength protein HMG-14 binds to DNA by weak attachment of the N-terminal half of the…
Abstract Electron spin resonance (ESR) spectroscopy has contributed significantly to the identification and characterization of paramagnetic impurities associated with clays. Following a brief discussion of the general principles of the technique, a review is given of the application of ESR to the study of those param…
Abstract Small amounts of Fe(III) induce precipitation of Fe(II) from carbonate solutions around neutral pH values. The reaction involves the formation of Fe(II)Fe(III) hydroxycarbonate, a green, layer-structured compound of the pyroaurite group of minerals. Variations in the concentration of Fe(II) in the solution ph…
Measurements were made of the dielectric constant along the ferroelectric axis ε a , the spontaneous polarization P s and the heat capacity c p of Rb 2 ZnCl 4 crystals in the temperature range from -150^° C to 150°C. The normal-incommensurate transition point determined as the peak position of c p lies at 30.1°C, whic…
This state-of-the-science publication on fracture test techniques for glass, ceramics, rocks, and cementitious composites is a compilation of 14 papers which were presented at the Eleventh National Symposium on Fracture Mechanics, which was held June 12-14,1978, at Virginia Polytechnic Institute and State University,…
Abstract Melt‐spun and injection‐moulded liquid crystalline polyesters have very high strength and stiffness and a very low coefficient of linear thermal expansion. The exceptional properties that characterise these polyesters are due to the presence of stiff, rod‐like polymeric chains, which become highly oriented du…
A powder profile refinement program written specifically for the easy application of structural constraints is made generally available. It is based on ORFLS and written in Fortran IV. Details of the philosophy of the program are outlined, with emphasis on the areas where more research is necessary. Examples of usage…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWool as a Biological Composite StructureHelmut Zahn, Josef Föhles, Magdalene Nlenhaus, Annette Schwan, and Manfred SpelCite this: Ind. Eng. Chem. Prod. Res. Dev. 1980, 19, 4, 496–501Publication Date (Print):December 1, 1980Publication History Published online1 May 2002Publis…
The available data on secondary emission yields from electron bombarded polymers was reviewed to identify those features they have in common with metals and inorganic insulators. As in the case of the more widely studied materials it was found that when the yield δ obtained at a bombarding electron energy Eo, is divid…
Three-pointed planar Si4 stars with unelucidated bonding and planar Si5 rings have been found in Li12Si7. In the formulation shown below with x = 4 and y = 10 the star could be an excited tetrahedrane state as Si; for x = y = 8 the star would be Si and isoelectronic with the carbonate ion.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncreased yield of a desired isomer by equilibriums displacement on binding to silica gel, applied to meso-tetrakis(o-aminophenyl)porphyrinJonathan LindseyCite this: J. Org. Chem. 1980, 45, 25, 5215Publication Date (Print):December 1, 1980Publication History Published online…
Attention was focused on the first steps in the pitting process, the adsorption of aggressive anions and the dissolution of aluminum oxide. The adsorption of chloride on alumina and aluminum powder are quite similar and show a saturation plateau at high chloride concentration; the amount of chloride adsorbed is propor…