Materials Literature
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Microstructural characterization of a high‐Al 2 O 3 substrate containing cofired thick‐film tungsten metallization, with particular emphasis on the metal/ceramic interface, was conducted. The substrate contained tabular Al 2 O 3 grains surrounded by a continuous calcium magnesium aluminum silicate glass containing par…
The theoretical potential energy function has been generated and used in the evaluation of the vibration-rotation energy levels of the 1A1 electric ground state of Si2C. For the bent equilibrium structure, the rotational constants and the vibrational band origins up to 1200/cm are given. The height of the barrier to l…
Two series of TeO2-P2O5 And Bi2O3-TeO2-P2O5 glass systems have been prepared for the present investigation. Measurements of the dc electrical conductivity in the temperature range of 300-573k for unirradiated and y-irradiation glass samples are reported. The dc electrical conductivity are found to increase with increa…
Article Influence of cation coordination on nucleation in silicate glasses was published on October 1, 1992 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 200, issue 1-4).
A formalism is developed for evaluating the effects of pair correlations on cascading of the nonlinear susceptibilities of fluid dielectrics. The corresponding correlative and nonlinear alterations of the usual local-field corrections are determined. These corrections to the nonlinear susceptibilities when the polariz…
Efficient infrared-to-visible upconversion is achieved in the YCl 3 -ErCl 3 -PbCl 2 -KCl phosphor system. Under 1.52 µm laser diode (LD) excitation, a specimen containing 20 mol% Er 3+ dopant emitted bright green luminescence, and the fluorescence lines at 410 nm, 550 nm and 660 nm reached the respective intensities o…
The study of the physicochemical properties of pure amorphous materials (complexes) consisting of Fe 2 O 3 and SiO 2 in various proportions indicates that the amorphous complexes will exhibit different properties and characteristics depending on the proportions of Fe 2 O 3 and SiO 2 . Addition of the amorphous complex…
Abstract The structural changes during enzymatic hydrolysis of cellulose substrates were studied by SAXS, WAXS, water retention values, and degree of polymerization. LODP cellulose samples in original (cellulose I) and mercerized (cellulose II) form were hydrolyzed using a commercial cellulase preparation produced by…
Abstract Background removal from x‐ray photoelectron spectra (XPS) was evaluated using the Shirley method and the Tougaard method. The effect of background removal over a range of kinetic energy was evaluated, and the Tougaard method was found to be effective over a wide energy range. In this paper we report a modific…
Porous silicon structures are formed by electrochemical etching of silicon in HF solutions. The selective dissolution of silicon results in the formation of a porous structure with a characteristic morphology dependent on the dopant type and concentration, the applied voltage, and the electrolyte composition. The phys…
Blue phases (BP's) in liquid-crystalline systems of high chirality exhibiting a short cholesteric temperature interval are investigated. In a BP I supercooled with respect to the cholesteric phase, the orientation of the cubic lattice with the (1,1,0) wave vector perpendicular to the substrate is spontaneously turned…
Abstract Acid-catalyzed Friedel–Crafts alkylation reactions of p-methylbenzyl chloride with benzene were carried out on four unmodified natural clay minerals. Phenyl-p-tolymethane was quickly and selectively formed in the presence of vermiculite. Although the specific surface area of vermiculite is smaller than those…
Kinetic effects such as coarsening and back diffusion affect the solidification rate and hence the rate at which latent heat of fusion is liberated. Neglecting these effects can bring about errors in macroscopic heat flow simulation. The paper investigates whether these errors are large enough to necessitate interacti…
Abstract The compatibility and crystallization behavior of blends of semicrystalline and amorphous polymers, traditionally used as matrices of high performance composites, has been studied. The analysis has been focused on blends of semicrystalline poly(etheretherketone) (PEEK) with amorphous poly(etherimide) (PEI) pr…
The isomers of 3,4-methylenedioxyamphetamine (MDA) functioned as discriminative stimuli in rats trained to discriminate either (-) MDA (1.25mg/kg) or (+) MDA (1.25mg/kg) from saline. Dose- and time-response curves indicated that drug lever selection occurred at doses of at least 1.00mg/kg of (-) MDA and 0.75mg/kg of (…
Waste and scraps from polyurethane rigid foams, with a glycolysis process, can be transformed into products that are liquid at room temperature and terminated with hydrogen active groups, so that they can be directly recycled in the production process of new rigid foams. The process is a very con venient solution to a…
The binding energies of core electrons in d ‐type stoichiometric diborides of several transition metals were measured by X‐ray photoelectron spectroscopy. Metal core lines in the diborides shifted either to higher or to lower binding energies compared with those appertaining to corresponding elemental states and varie…
The desorption of indium during molecular beam epitaxy (MBE) growth of InGaAs and GaAs/InGaAs/GaAs quantum wells has been investigated by reflection high energy electron diffraction (RHEED). The indium desorption activation energy calculated from the temperature dependence of the InAs growth rate is shown to be almost…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution viscosity of polystyrene at conditions applicable to commercial manufacturing processesDong Min Kim and E. Bruce NaumanCite this: J. Chem. Eng. Data 1992, 37, 4, 427–432Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published i…
Fiber cohesion and bulk properties and their consistency have a significant influence on yarn manufacturing processes and yarn quality. These critical properties depend on several staple fiber properties, including staple length, finish type and level, fiber geometries, crimp type and level, fiber additives, degree of…