Materials Literature
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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…
The effects of the water/TEOS ratio, pH, temperature and alcohol/TEOS ratio on the degree of polymerization and gelation time in the acid-catalyzed sol-gel polymerization of TEOS have been studied systematically with Monte Carlo simulation. Although linear polymerization by bimolecular reaction was assumed, the revers…
A generalized definition of the coupling coefficient, useful for the evaluation of transducers that incorporate an electrostrictive active element, is introduced. The definition is expressed under quasistatic conditions and becomes zero when no bias is applied (assuming that the effects of remanence are negligible), a…
Electron energy-loss spectroscopy (EELS) has been used to determine the valence state of manganese for all the samples at low temperature (93 K). EELS results indicate that the valence state of manganese keeps constant (∼3.5) for all the samples. The effects of the A-site cation size mismatch on the charge ordering (C…
High purity alumina ceramics have been used for more than 25 years in biomedical applications due to their excellent wear behaviour and high strength. Nevertheless great effort have been undertaken to develop a material with increased strength combined with excellent wear properties. One candidate material family is Z…
Polyurethane elastomer (AU) and silicone rubber (VMQ) form immiscible blends with a low compatibility. In order to improve the compatibility and physical properties of the blends, VMQ was first grafted with vinyl triacetoxy silane (VTAS) by using dicumyle peroxide (DCP) as a grafting initiator; subsequently, it was bl…
Abstract An experimental procedure to determine metallic thin film thicknesses by using electron probe microanalysis (EPMA) is presented. Several monoelemental films of Al, Ti, Cr, Cu, Nb, Mo and Au with different thicknesses, deposited on an Si substrate, were characterized by Rutherford backscattering spectrometry f…
Sublimation and deposition of the metal-organic complex palladium (II) acetylacetonate [ Pd(acac)2] was investigated through thermogravimetry and XRD. The temperature range for sublimation, avoiding thermal decomposition, was determined to be 100−160 °C and required to take place in the presence of an inert gas such a…
Dielectric measurements on a sample consisting of banana-shaped molecules were carried out in a frequency range between 0.1 Hz and 10 MHz. The sample exhibited B2 and B4 phases. As usual, two ranges of relaxation were detected in the B2 phase, the fast reorientation about the long axes of the molecules and a slow coll…
We report the results of optical in situ monitoring of the epitaxial growth of perovskite oxide thin films by an oblique-incidence reflectance-difference (OIRD) technique. Optical oscillation that corresponds to the growth cycle of an interrupted growth mode (monolayer oscillation) is observed. The monolayer oscillati…