Materials Literature
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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…
Critical modeling issues relating to rigorous boundary element method (BEM) analysis of diffractive optical elements (DOEs) are identified. Electric-field integral equation (EFIE) and combined-field integral equation (CFIE) formulations of the BEM are introduced and implemented. The nonphysical interior resonance phen…
The stable vinyl polyperoxide, namely, poly(α-phenylstyrene peroxide) (PAPSP), an alternating copolymer of α-phenylstyrene and oxygen, has been synthesized by the oxidative polymerization of α-phenylstyrene. It was characterized by 1H and 13C NMR, FT-IR, DSC, GC-MS and GPC studies. The overall activation energy (Ed) f…
Bulky lateral carboxylate substituents were introduced at the benzylic position of 2,5-bis[4-(n-perfluoroheptyloctyloxy)benzoyloxy]toluene by esterification of the corresponding benzyl bromide with potassium carboxylates. In spite of the bulky lateral substituents, none of the 2,5-bis[4-(n-perfluoroheptyloctyloxy)benz…
The compounds Ln2AuP3 were synthesized by reaction of the elemental components in evacuated silica tubes. Their crystal structures were determined from single-crystal diffractometer data. The compounds with Ln = La, Ce, and Pr crystallize with an orthorhombic U2NiC3 type structure (Pnma, Z = 4). The structure refineme…
Power loss of nonoriented electrical steel was measured under sinusoidal and square wave excitation. The results show that total power loss under sinusoidal excitation is higher than that under square wave excitation. The total loss difference at the same peak flux density ranges from 7% to 15%. The dynamic losses dep…
A dielectric-film waveguide with a grating etched on its film-cover interface can be used as a polarization converter. The e wave can be converted into the h wave and vice versa if the guided wave is incident obliquely to the grating vector. The polarization converter is analyzed by use of a quasi-optic technique. A h…
Abstract The short-range order of vitreous V20 5 and of three (Zn0)Jt(V20 5)1_x glasses with x = 0.2, 0.4, and 0.5 is studied by X-ray and neutron diffraction experiments where the change of the contrast allows to resolve the V -0 and Z n -0 correlations. The V -0 and the Z n -0 first-neighbor peaks are approximat ed…