Materials Literature
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Line charge, which is trapped after opening the line circuit breaker of a long overhead transmission line or power cable, is discharged through magnetic voltage transformers (VTs) or shunt reactors, if either is connected to the power line or cable. Although this duty is very important for a VT, there is no descriptio…
Various parameters relevant to the puncture resistance of protective clothing materials were studied. The experimental set-up was installed in an Instron testing machine. Testing was performed in a compression mode. A point was installed in a 890-newton (200-lb) load compression force cell in the movable arm of the ma…
Water trees in crosslinked and uncrosslinked polyethylene are easily visible under the microscope, and often appear to show some structure. Thus regions of greater water density have sometimes been termed channels. However this terminology cannot be taken to indicate the presence of hollow tubes since no cracks or cra…
Growth mechanism of plagioclase crystals from a basaltic melt of tholeiite type prepared by chemical reagents was studied by using the isothermal-dropping technique with iron and platinum capsules. Produced phases are plagioclase, olivine, pigeonite and augite. Crystal morphology of plagioclase varies from prismatic t…
Se pone de manifiesto la idoneidad de la técnica de calorimetría diferencial de barrido para la caracterización de materiales. Se presentan ejemplos específicos de aplicación de dicha técnica en el estudio de los fenómenos ligados a la transición vitrea y cinética de cristalización de vidrios calcogenuros y metálicos…
Multilayered composites having the structure of Ni/ZnO/PrCoOxide/Au were fabricated by the sputtering technique and their electrical properties were examined. It was found that a multilayered composite is an excellent low voltage varistor (α=30, breakdown voltage=6.5V). The results of the voltage-current (V-I) and the…
液架橋形成機構を明らかにするために, 接触角が0°の場合の等径2球間に形成される溶解性不純物を含まない理想的な液架橋の形状についてKelvinの式を適用して理論解析を行った.その結果, 液架橋形状を雰囲気の湿度, 液体の物性, 粒子径などの関数として求めることができた.また, Kelvin効果によって形成される液架橋の大きさは最狭部の直径で100nm以下と非常に小さいことがわかった.実験では, 2枚のガラス製凸レンズおよび2球のガラスビーズ間に液架橋を形成させ, 恒温恒湿器内の一定の温度・湿度下で, 架橋形状を顕微鏡によって観察した結果, 理論解析を裏付ける結果が観察されると同時に, 架橋液中にわずかでも溶解性不純物が含まれる場合…
Degradation mechanism of 1, 2-bis(2, 4, 5-trimethyl-3 -thienyl)-1, 2-dicyanoethene (TECN)was studied by product analysis. When TECN was irradiated in dichloromethane with 420nm light, the closed-ring isomer with absorption maximum at 520 nm was the sole product. O n the other hand, when irradiated with 370 nm light, o…
Abstract In an earlier investigation a polynomial method to estimate area and peak positions in wide‐scan XPS spectra was demonstrated with digital data (see N. H. Turner and A. M. Single, Surf. Interface Anal. 15, 215 (1990)). This method uses a density of points of about one per electron‐volt. It was found that in m…
Poly (β-hydroxybutyrate) and its copolymer poly (β-hydroxybutyrate-co-β-hydroxyvalerate) P (HB-co-HV) were treated with methyl- and ethylamines. Melting peak temperatures, number-average molecular weights (Mn) and long spacings (L) of treated samples decreased as the concentration of amines or the treating time increa…
Diffusion, permeation and trapping of deuterium in nickel exposed to a deuterium plasma were studied experimentally at temperatures of 455 to 568 K.One side of a nickel membrane was exposed to the plasma and the plasma-driven permeation was monitored.A beam of 3 He irradiated the same side simultaneously to observe de…
Polyfurfuryl alcohol (PFA) was carbonized between the lamellae of saponite (SAPO) clay which has a structure similar to montmorillonite. The carbon thus obtained was characterized and compared with the carbon previously prepared from (MONT). The carbon from SAPO is quite different from the MONT-carbon; i. e., the form…
Abstract On heating films of long‐chain alkylamino‐1,3,5‐triazine‐2,4‐dithiols, substituted with unsaturated groups in the 6‐position, on copper plates in air, the films become partially insoluble in benzene. The polymerization rate and monomer conversion increased with temperature above 80°C and with time. At low tem…
Phosphophyllite, an important material in the coating of steels for rust prevention, has been synthesized in bulk from aqueous solution. A deuteriated sample has been studied by powder neutron diffraction and the structure refined in order to locate accurately the water molecule distribution. The thermal decomposition…
A computer program (POLFIT) has been developed for the analysis of polarization curves that provides full graphics functions and has both simulation and fitting procedures. Electrochemical parameters such as anodic and cathodic Tafel slopes, polarization resistance, corrosion current density, and corrosion potential,…
According to first-order capture equation, a kinetic theory for trap creation in solid dielectrics is proposed in this paper. Taking a certain trap density as critical condition of electrical breakdown, it is found that the dielectrical lifetime is proportional to the exponent of electrical strength. Such a theory is…
Calibration curves of extremely low concentrations of the alloying elements Sn, Fe, Cr and Ni in Zircaloy were obtained, using standard samples, by energy dispersive X-ray spectroscopy to measure concentration distributions of alloying elements dissolved in the Zircaloy matrix. Their detectable limits were 0.21 at% fo…
The mode of fracture and the dictile-to-brittle transition temperature (DBTT) of high purity iron (\gtrsim99.999%) have been investigated with two sets of specimens of different grain boundary character. Wire specimens of 0.4 mm diameter were tested in tension at a strain rate of 8.33×10−5/s.The grain structure of one…
This paper presents the results of experiments on seams sewn under constant sewing conditions when the mechanical properties of the plies are different. By using plies of the same fabric along different directions, the effects of the mean properties of the plies as well as their incompatibility are studied, while the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilities of metal complexes of the meso and SS isomers of oxydisuccinic acidRamunas J. Motekaitis and Arthur E. MartellCite this: Inorg. Chem. 1992, 31, 1, 11–15Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 Janua…