Materials Literature
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The ac electrical response of the grain boundary in the ZnO–Bi 2 O 3 ‐based varistor system (in the frequency range 10 −2 ≤f≤10 7 Hz) has been analyzed using complex plane analysis techniques as a function of temperature (90°≤T≤150°C) and electric field (E 60%lmA/cm2 ≤E≤E lmA/cm2 ). The high‐temperature/field data wer…
Three specimens of Colubroidea from the locality of barrancas de Monte Hermoso , Buenos Aires Province, Argentine Republic, of Montehermosan mammal age s.l. (PIiocene) are described. Two of them are assigned to the Colubridae. The hypothesis referred to the entrance of the Colubroidea in South America are discussed
This paper describes an evaluation of various silicone-based materials as mould release agents for a polyurethane/smooth stainless steel interface. The release properties of these materials have been characterized by the use of a blister test and data are provided for peeling energies over a range of peeling velocitie…
Abstract not Available.
The compounds (η-2,4-dimethylpentadienyl)U(BH4)3(2) and (η-6,6-dimethylcyclohexadienyl)2U(BH4)2(5) were obtained from the reactions of U(BH4)4(1) with the corresponding potassium dienyl anions; treatment of (η-2,4-Me2C5H5)3U with TlBH4 gave (η-2,4-Me2C5H5)2 U(BH4)2(3) and the equimolecular mixture of (5) and (1) was t…
A comprehensive review of grain boundary structure is given concentrating on models which can be tested on the basis of experimental results from polycrystals. A survey is also given of recent experimental studies, centered upon the crystallographic aspects in terms of the grain misorientation texture. It is shown tha…
For phototransitions between nondegenerate bands the shift contribution to current, related to the density matrix elements that are nondiagonal regarding the numbers of bands, is compared with the contributions of common nature, conforming to asymmetry of carrier velocity distribution. It is shown that the shift recom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure/volume/surface area relationships in foams and highly concentrated emulsions: role of volume fractionH. M. PrincenCite this: Langmuir 1988, 4, 1, 164–169Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January…
The title compound (1b), a new non-planar chlorocarbon possessing approximate D3d symmetry, has been prepared by chlorination of coronene (1a); complete substitution of (1b) by arenethiolate nucleophiles in the dipolar aprotic solvent DMEU (1,3-dimethylimidazolidin-2-one) yields the dodecathioethers (2a) and (2b), mem…
This report describes laboratory studies conducted to evaluate the effectiveness of 10 additives to inhibit the self-heating of coal. Aqueous additive solutions were applied to a bituminous coal with a high spontaneous combustion potential, and the minimum, self-heating temperatures (SHT's) of the dired coal-additive…
Aging effects are investigated by means of comparing a 7 yr-old conductor of the Takeyama HVDC test line with a new one. Long-term comparative tests were carried out in monopolar and bipolar arrangements. Corona currents of the aged conductor were greater than those of the new one by 1 approximately 2 times, approxima…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPerformance of platinum/alumina catalysts in automobile engine exhaust with oscillatory air/fuel ratioByong K. ChoCite this: Ind. Eng. Chem. Res. 1988, 27, 1, 30–36Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 Janua…
Une étude en microscopie et diffraction électroniques a été réalisée sur des échantillons de goethite et d'hématite, associées aux kaolinites, prélevés le long de profils d'altération latéritique (Cameroun). La morphologie de la goethite varie suivant le site de développement, au contraire de celle de l'hématite. Des…
The synthesis and X-ray crystal structures of the anions SnAs144– and As224–, which represent the largest polyarsenides characterized to date, are reported.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduct selectivity during methanol decomposition on titania powdersE. A. Taylor and G. L. GriffinCite this: J. Phys. Chem. 1988, 92, 2, 477–481Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://pubs.…
To our knowledge, hexacyanoferrate (III) and hexacyanomanganate (III) are the best representative cases for the study of solvent effects on redox potentials of anions. To enlarge examples in this field, it is shown here that two heteropolyacid potassium salts, and , as studied by slow sweep rate cyclic voltammetry, un…
An exact solution and an approximate solution have been derived for the columnar dendrite model proposed by Ohnaka, 8) in which a solidification rate, equilibrium distribution coefficient and diffusion coefficient in solid are assumed to be constant throughout the solidification. By comparing with the exact solution,…
The effect of exposure of Wyoming bentonite to glacial acetic acid has been studied by F.t.i.r., X.p.s, SEM and acidity measurements, in order to investigate the possibility of using such a non-aqueous technique as an alternative activation process. Treatment with glacial acetic acid, results in an overall increase in…
The complete ODF of titanium, cold rolled up to 80% deformation, was calculated using the series expansion method, including the zero range method. The rolling texture obtained after 80% deformation is mainly characterized by the well‐known orientation {0001} ± 40°TD but with distinct spread ranges about it. At about…
Zinc–chromium mixed oxides, with Zn/Cr atomic percentage ratios between 33:67 and 50:50, have been prepared by a coprecipitation procedure. Their bulk structure has been investigated by the techniques of X-ray diffraction, infrared spectroscopy and electron spin resonance spectroscopy. They all appear monophasic to X.…