Materials Literature
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Quenching of Er/sup 3+/ ions by homogeneous energy-transfer upconversion in high-concentration erbium-doped silica glasses has been theoretically investigated, The results indicate that at Er/sup 3+/ concentrations of 1.0-2.0/spl middot/10/sup 26/ m/sup -3/ or below, the kinetic limit of strong migration is not reache…
Reflective twisted nematic displays where the output polarizer is eliminated are analyzed and demonstrated. The absence of the rear output polarizer has many advantages, including much higher brightness and higher resolution. In this article, we examine the solution space for the design of such reflective displays. Bo…
Abstract A systematic study has been made on the influence of doped rare‐earth metal ions (Er 3+ and Nd 3+ ) on the molecular interaction present in thin films fabricated from chitosan‐acetic acid solutions (chitosan/HAc). FT‐IR spectroscopy (including NIR, MIR and FIR) coupled with X‐ray photoelectron spectroscopy (X…
Equilibrium binding of Thermomonospora fusca E3, E4 and E5, the E3 binding domain (CBDE3), and Trichoderma reesei CBHI on Avicel PH102 and bacterial microcrystalline cellulose (BMCC) was studied. The maximum adsorption levels, Eb,m, for all four cellulases and the binding domain were 9–30 times higher on BMCC than on…
Regiorandom and regioregular head to tail coupled poly(3-butylthiophenes), poly(3-octylthiophenes) and poly(3-dodecylthiophenes) have been synthesized by direct oxidation of 3- n -alkylthiophenes using FeCl 3 as oxidant and by regiospecific dehalogenation of 2-bromo-3- n -alkylthiophenes. NMR characterizations indicat…
Monoecious, bisexual and unisexual clones of Achnanthes longipes were isolated from the Black Sea and studied in laboratory culture. Clones differed in their growth characteristics : in monoecious clones the cells formed tufted aggregations while in other clones they were more dispersed. Bisexual and unisexual clones…
All articles of this category 2,3,9,10-Tetrakis(3,3-dimethyl-1-butynyl)phthalocyanine and 2,3,9,10-tetramethoxyphthalocyanine were prepared by the condensation of a "half" phthalocyanine intermediate (prepared from 4,5-bis(3,3-dimethyl-1-butynyl)phthalonitrile or phthalonitrile) with phthalonitrile and 4,5-dimethoxyph…
We have studied the behavior of confined ultrathin films of a simple model system in which the fluid and wall particles were modeled as Lennard-Jones rare gas atoms by Monte Carlo simula-tions. We have used a new (Grand isoforce) statistical ensemble in these simulations, with which it is possible to simulate thin fil…
Cumene hydroperoxide (CHP) is normally produced by the cumene oxidation process. Severe fire and explosion incidents have occurred in oxidation and concentration processes due to the thermal instability of CHP. In this study, we used DSC and ARC thermal analysis techniques to measure the runaway thermokinetic data. Da…
Abstract— This paper analyses the validity of the fracture mechanics approach to hydrogen assisted cracking in metals on the basis of K ‐dominance over both the stress‐strain state and the accumulation of hydrogen in the fracture process zone. Stress‐strain assisted diffusion of hydrogen is considered as the rate cont…
One-dimensionally oriented thin crystals of a phenylene oligomer, p -sexiphenylene (6P), are grown on the poly( p -phenylene) (PPP) film prepared by the friction-transfer method. The 6P molecules tend to grow epitaxially on the (001) planes of alkali halides and the molecular axis is parallel to the <110> direct…
The effects of grain size on the tribological behavior of alumina were investigated. Alumina specimens with three different grain sizes, namely 4, 8, and 14 m, were used as pins and disks in a flat‐pin wear test in which the apparent contact area was maintained constant during the test. In contradiction with previousl…
The macroscopic magnetic properties of magnets strongly depend on the microscopic magnetisation processes and the microstructure of the magnets. Whereas ideally homogeneous magnetic materials exhibit a relatively simple and well understood magnetisation behaviour, more complex materials such as two phase composites or…
Using (110) ${\mathrm{NdGaO}}_{3}$ wafers as the lattice matched substrates, ${\mathrm{PbTiO}}_{3}$ thin films have been epitaxially grown by metal-organic chemical vapor deposition under reduced pressure. Highly resolved Raman spectra of the thin films have been recorded by a grazing-angle scattering technique. The E…
A new application of the atmospheric cold plasma torch has been investigated. Namely, the surface treatment of an air-exposed vulcanized rubber compound. The effect of plasma treatment was evaluated by the bondability of the treated rubber compound with another rubber compound using a polyurethane adhesive. The adhesi…
The optimized structure and spin-state energetics of the iron(ferric)−hexaaquo complex, [Fe(H 2 O) 6 ] 3+, in high ( S = 5/2), intermediate ( S = 3/2), and low ( S = 1/2) spin states were determined from a common starting structure using unrestricted Hartree−Fock (UHF), Møller−Plesset (MP2), and nonlocal density funct…
We have studied the dependence of the electro-optical properties of polymer dispersed liquid crystals (PDLC) on the ultraviolet (UV) cure of the solution of monomer and liquid crystal. The kinetics of UV polymerization and its effect on the morphology of the phase separated droplets of liquid crystal determine the swi…
Multicomponent Ga2O3–In2O3 films have been prepared by dc magnetron sputtering using targets with a Ga content [Ga/(In+Ga) atomic ratio] of 0–60 at. %. Transparent conducting thin films prepared with Ga contents up to about 40 at. % were identified as Ga-doped In2O3 (In2O3:Ga). A minimum resistivity of 5.8×10−4 Ω cm a…
A simple equation suitable for predicting the growth rate of a vapor bubble in uniformlysuperheated pure liquids and in binary solutions with a non-volatile solute was developed. The equation also improves on the popular pure-liquid bubble growth expression of Mikić et al. (International Journal of Heat and Mass Trans…
The readily available permanganate, KMnO 4, was successfully utilized in the synthesis of manganese oxide octahedral molecular sieve (OMS-1) with the todorokite type structure. The magnesium concentration in the starting materials was systematically varied to study the synthetic chemistry of Mg−OMS-1. The techniques s…