Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Measurements are presented of increased harmonic currents in a 500 kV power system due to geomagnetically induced currents (GIC). The measurements were made of 60 Hz, 120 Hz, and 180 Hz currents and GIC in a 1200 MVA transformer. The recorded increases in the harmonic currents at times of GIC are consistent with compu…
On the basis of Landau-de Gennes-theory it is demonstrated that point defects in nematic liquid crystals may have a biaxial nonsingular core. From this result a critical diameter is derived for linear topological solitons in nematics. Solitons of smaller diameter can relax to the uniform nematic state without energy b…
The basic parameters of screen printing are discussed, and an analytical model of the screen printing process is introduced. The ink roll in front of the squeegee is treated as a pump generating, close to the squeegee edge, high hydrostatic pressure which injects ink into the screen meshes. The shearing of the ink, th…
The collagens of normal and end-stage alcoholic cirrhotic human liver were investigated. Mild conditions of pepsin digestion were employed to preserved the more pepsin sensitive type IV collagen molecules while increasingly more harsh conditions were used which solubilized the type I and type III hepatic collagens. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of (.mu.-dithio)bis(tricarbonyliron), an inorganic mimic of organic disulfides. 3. Reaction with low-valent metal compounds and some interesting isolobal analogies involving the productsMartin Cowie, Roger L. DeKock, Timothy R. Wagenmaker, Dietmar Seyferth, Richard…
The interrelationships between the corrosion rate of pipeline steel and soil parameters have been investigated under both controlled laboratory and natural outdoor conditions. Both defect-(holiday)-free, polyethylene-coated samples and samples with intentional 1-cm2 holiday areas were studied. By using electrochemical…
Cocondensation of atoms of the lanthanide elements with 1,3,5-tri-t-butylbenzene gives the thermally stable bis(η-arene)lanthanide(0) sandwich compounds for the lanthanides Nd, Tb, Dy, Ho, Er, and Lu, thermally unstable complexes for La, Pr and Sm, and unisolable materials for Ce, Eu, Tm, and Yb; a simple bonding mode…
On montre que les structures des verres de borate de Cs, Rb et K, de compositions couvrant les larges domaines de formation du verre, peuvent etre systematiquement etudiees par spectrometrie Raman
The development of polyimide films in Japan is discussed. The chemical structure of the films and their polymerization mechanisms are described. Types of polyimide films are identified, and their characteristics are examined. Special attention is given to their thermal and chemical properties and their radiation resis…
Abstract Quantitative determination of the weight percentages of mineral phases in rocks and soils challenges theorist and analyst alike. Although precision – analytical reproducibility – is often described in great detail, few, if any, commercial laboratories or published methods say much about accuracy – the approac…
The direct oxidation of methane into methanol has been studied in a flow microreactor. The effects, on the selectivity to methanol, of the type of reactor, temperature, pressure, residence time, oxygen content, gas mixing and dilution, have been investigated. The results show that at relatively low pressures the use o…
We investigate a two-dimensional Lennard-Jones mixture with the interaction parameters chosen so as to favor configurations where the large atoms form squares and equilateral triangles. Many such configurations are possible which by our choice of interactions are nearly degenerate in energy. It is hypothesized that a…
Sinking and sedimentation rates of a natural phytoplankton community were simultaneously measured during the course of a diatom winterkpring bloom in a 13m3 experimental mesocosm. Sinking rate was determined directly in settling columns and was calculated from sediment trap catches. The 2 methods yielded significantly…
A theoretical discussion of a new method of measuring thermal properties, particularly the thermal handle of textilees, is followed by the description of a new Alambeta device and sensor developed for the purpose.
Authigenic illites and chlorites from elastic reservoirs, offshore Norway, have been studied by analytical transmission electron microscopy (ATEM). Present-day reservoir conditions range from 1600 m burial depth and 70~ to 4400 m and 160~ The reservoir units have experienced continuous subsidence since early Cretaceou…
Magnetic phase transitions of molecular materials are currently of large interest, particularly those leading to a permanent magnetic moment. Several different approaches are used in order to obtain three-dimensional order, and among them one particularly interesting is that of assembling in lattice spins with largely…
—The primary goal of surface modification of fluoropolymers is to improve adhesion to these low surface energy materials. Both classical methods and newer processes have been used as a means to this end. Various methods of modifying fluoropolymer surfaces include wet chemical etching, electrochemical reduction, grafti…
The author introduces a general criterion for leader inception of phase-to-ground air insulation under positive critical switching impulses. This criterion established the correspondence between continuous leader initiation in the vicinity of the highly stressed electrode and conditions prevailing later at the instant…
We study the equilibrium statistics of flexible neutral polymer chains attached by one end onto a flat interface (the polymer « brush »). We account for the finite extensibility of the polymers, adopting a form for the free energy of a stretched chain that diverges as its fully-extended length is approached. Adopting…
Procedures for designing a tunable liquid crystal (LC) electrooptic filter are illustrated. Selective filtering of one of the two mixed laser lines is used as an example for calculation. It is demonstrated that a LC filter can select a desired beam to pass while rejecting the other one, or vice versa, by switching the…