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。
Attractive interaction with the cation overcomes the electrostatic repulsion between two tetracyanoethylene radical anions, [TCNE].−, and leads to the formation of a diamagnetic dimer [TCNE]22− (see picture), for example, in [K(glyme)]2[TCNE]2. The bonding is described as two-electron, four-center bonding arising from…
Electronic transport calculations were carried out for Bi1−xSbx nanowires (0⩽x⩽0.30) of diameters 10 nm⩽dW⩽100 nm at 77 K. A band structure phase diagram was generated, showing the dependence of the relative band edge positions on diameter and composition. Calculations of the thermoelectric figure-of-merit (ZT) predic…
selectivity at ≤120°C. Lewis acidity, redox properties, and a high surface metal oxide concentration are essential for good catalytic performance.
Water after-etching of porous silicon in an external electric field is studied. The application of the electric field, irrespective of its strength and orientation, is shown to decrease the etch rate. When the field vector is directed from the porous layer inward to the sample, the electrode potential in the silicon-e…
A new antireflective coating (ARC), amorphous carbon (C-ARC), substituted for inorganic ARC (SiON) is gaining attention in dynamic random access memory processing as devices scale down, requiring more fine control of submicron (<0.13μ) patterning. A parametric study of enhancing etch selectivity of C-ARC over p…
A novel wing shaped achiral antiferroelectric liquid crystalline compound, 1,3-phenylene bis-[phenylene-1-biphenyldicarboxylato)-3-(4-n-tetradecyloxybenzoyl)biphenyl dicarboxylate] (abbreviated as PBPBTB), having 1,3-phenylene [4-biphenyldicarboxylate-(4-n-tetradecyloxy benzoate)] units as wings, has been synthesized…
Abstract An isothermal section of the phase diagram for the system Pr– Pd–O at 1223 K has been established by equilibration of samples representing 13 different compositions, and phase identification after quenching by optical and scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive analy…
Mechanics of materials subjects in the engineering curricula obviously involve both mechanics and materials concepts, but many such subjects have become overly concentrated on mechanics at the expense of materials. A stronger linkage between the two disciplines could improve both efficiency and student learning. Some…
Nanophase dispersions of SmCo/sub 5/ in either an Al, Co, Co-Fe, Si, or Ti matrix have been synthesized by using pulsed laser deposition, PLD, to deposit the SmCo aggregated grains while simultaneously sputtering either Al, Co, Co/sub 0.5/Fe/sub 0.5/, Si, or Ti. Substrate temperatures of 375 to 435/spl deg/C were suff…
We obtained polymer dispersed nematic liquid crystal films E7/PMMA. Using the thermally stimulated depolarization currents method and registering the optical signal simultaneously we studied the dependence of the phase transitions temperatures on the polarizing electric field. Thermal switch behavior and its dependenc…
New homologous series containing a thienyl-enaminoketone-phenyl (TEP) core substituted by a halogen atom have been synthesized. It is shown that the stability of the orthogonal phases decreases with the decreasing electron-accepting properties of the halogen atom. Generally the materials studied form orthogonal smecti…
By combining molecular beam techniques and time-resolved infrared reflection absorption spectroscopy (TR-IRAS) we have studied the kinetics of the CO oxidation reaction on an alumina-supported Pd model catalyst. The Pd particles are deposited by metal evaporation under ultrahigh vacuum conditions onto a well-ordered a…
The availability of high quality variable inductors has always been essential to devices used in different power engineering instrumentation. Different attempts have been made to improve the characteristics of iron core inductors. This paper presents an approach through which an iron core inductor linearity and permea…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
The influence of the type of solvent on styrene polymerization behavior with cyclopentadienyltitanium trichloride (CpTiCl3) and methylalumoxane (MAO) catalytic system at 25°C was investigated. It was found that the number-average molecular weight (M̄n) of the polystyrene produced was correlated with the dielectric con…
The paper presents the results of the energetic event triggered in FARO test L-33, which was the last test of the FARO series dedicated to large-scale experimental investigation of FCI in light water reactors. In FARD L-33, 100 kg of UO{sub 2}-ZrO{sub 2} corium at 3000 K were released via a 50 mm orifice to a pool of…
The output voltage generated from bundles of twisted Vicalloy wires was studied. When the magnetically soft layers of the wires were reversed by an applied external magnetic field, a pulse voltage, owing to a large Barkhausen jump, was induced in a search coil wound around the wires. The output did not depend on the e…
Abstract The elements that are needed to describe a deformation structure—grains, grain boundaries, macroscale banding within crystals, cell blocks, geometrically necessary boundaries and incidental dislocation boundaries (cell boundaries)—are presented and described for fcc metals and alloys of medium to high stackin…
A homologous series of 4-methyl-2'-hydroxy-4'-alkoxyazobenzenes with chain lengths from 1 to 12 carbon atoms was synthesized and the temperatures of melting, freezing and transition from nematic to isotropic phase were determined. The main thermodynamic characteristics for those transitions were estimated. The liquid…
The electronic structure around a point defect in an annealed TiO 2 (110)-(1×1) surface has been studied by scanning tunneling microscopy/spectroscopy. At a defect site of bridging oxygen, we found an unoccupied defect state at 1.2 eV above the Fermi level. Trapped electrons at the gap states were found on fivefold-co…