Materials Literature
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Microparameters of migration and self-quenching of luminescence from the (3 P 0, 1 I 6) levels of Tm 3+ ions are calculated and the luminescence decay from the 3 H 4, 1 G 4, and 1 D 2 levels are analyzed in the concentration series of LiY1−x TmxF4(x=0.5–10 at. %) crystals upon weak selective excitation. It is shown th…
The aim of this work was to study the suitability of silane treatments for hot-dip galvanized (HDG) steel. Silane coupling agents were used as adhesion promoters between paint and galvanized steel. The focus was on characterization of the silane-treated surfaces. The adhesion and corrosion performance of the selected…
A simulation of the growth of pits on aluminum during anodic etching in hot chloride solutions was developed. The simulation is based on equations for mass transport and for the potential-controlled removal of chloride ions from the dissolving surface. The latter process initiates oxide passivation. Etch pits are foun…
Electron microscopy and spectroscopic ellipsometry are used to investigate the microstructural and optical properties of porous SiC. It is discussed that 1c dislocations are likely to play a role in the initial phases of the anodization process in terms of formation of nanometer sized holes. Pores are found to initial…
The feasibility of applying extrusion technology to the processing of zeinfatty acids resins was investigated. Zeinresins were prepared in the laboratory by mixing zein and fatty acids (1:0.75 w/w) in an aqueous ethanol solution followedby the recovering and drying of plasticized zein into a granular solid. Granular r…
A hydrothermal polymerization and simultaneous sulfidation (HPSS) process and the mechanism for the fabrication of one-dimensional (1-D) nanocomposites of well dispersed CdS nanoparticles self-assembled in the polymer nanorods is presented.
Abstract We have implemented ab initio linear combinations of Gaussian‐type orbital calculations with generalized localized spin density approximation (GLSDA) for a dimer of equilateral H 3 as a model of the noncollinear magnetic clusters. It has been found that the GLSDA solution with the three‐dimensional noncolline…
A thermomechanical analysis of yarns in a tensile mode is used to characterize wool fibers modified to show the β-crystal form in comparison with native untreated wool retaining the α-crystal form. The TMA curves show that fiber extension causes significant structural modification of the wool samples. In particular, m…
The ionization potential is a fundamental property of an element. In order to determine the first ionization potential, a method based on the measurement of photoionization thresholds in the presence of a well-defined electrical field is used. By one or two step resonant laser excitation, the investigated atoms are pr…
The rimoportula is a morphological feature that is particularly common among centric diatoms but which has not featured prominently in descriptions of the many species of Aulacoseira. Primarily this is because it is often difficult to observe with the light microscope but using very simple techniques and scanning elec…
The recent progresses in the unique gas barrier of polymer/clay nanocomposite are reviewed.Their preparation methods,structural characteristics and properties are discussed.
Silicon nitride powders with concurrent addition of Yb2O3 and MgO were sintered at 1900°C for 2-48 h under 0.9 MPa nitrogen pressure. Microstructure, lattice oxygen content and thermal conductivity of the sintered specimens were evaluated. All specimens had a duplex microstructure composed of small matrix grains and e…
Copper electroplated profiles exhibit pattern dependent topography. We propose a methodology for the characterization and modeling of feature scale copper step heights and the height of copper array regions, as a function of layout parameters. The resulting empirical models with parameters extracted from conventional…
Photoluminescence spectra of the direct free excitons and strain-induced states in ε-GaSe, GaSe0.9S0.1, and GaSe0.8S0.2 under hydrostatic pressure up to 1 GPa are reported for the first time. Red-shift and broadening with pressure were detected for all bands. The pressure coefficients of the direct free excitons and s…
Poly( p -phenylene) (PPP) films were prepared by anodic oxidation of biphenyl and p -terphenyl in a rigorously dried dichloromethane solution with 0.10 M tetrabutylammonium tetrafluoroborate as an electrolyte. The polymer growth and film properties were studied using cyclic voltammetry, electrochemical quartz crystal…
The photosensitized degradation of poly(L-lactic acid) (PLA) via an anionic reaction process was studied using spectrophotometry, electron spin resonance (ESR), and gel permeation chromatography (GPC) measurements. PLA film doped with N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) was irradiated at 77 K using UV ligh…
The blood compatibility of poly(ethylene oxide) (PEO)-grafted and heparin (Hep) immobilized polyurethanes was investigated using in vitro plasma recalcification time (PRT), activated partial thromboplastin time (APTT), platelet adhesion and activation, and peripheral blood mononuclear cell (PBMC) adhesion and activati…
The lyophilized decoction of Salvadora persica L. roots possesses a significant protective effect on ulceration induced by ethanol, indomethacin and cold restraint stress in rats. In this work, we study the effect of chronic intragastric administration of S. persica decoction on experimental acetylsalicylic acid (ASA)…
An experimental charge density investigation of 7,7-di[(S)-(+)-2-(methoxymethyl)pyrrolidino]-8,8-dicyanoquinodimethane establishes the presence of a large charge separation as well as a high in-crystal dipole moment compared to the free molecule in frozen geometry, consistent with the high SHG activity of the compound.
The synthesis, characterization and mesomorphic properties of five series of copper(I) isocyanide complexes [CuCl(CNR)] [R = C6H4C6H4OCnH2n + 1 (LA), C6H4OOCC6H4OCnH2n + 1 (LB), C6H4COOC6H4OCnH2n + 1 (LC), C6H3{3,4-(OCnH2n + 1)2} (LD), C6H2{3,4,5-(OCnH2n + 1)3} (LE); n = 4, 6, 8, 10, 12] are described. Although some o…