Materials Literature
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The Deposition by Aqueous Acetate Solution (DAAS) technique has been developed for the preparation of thin films of Pb(Zr0.53Ti0.47)O3[PZT(53,47)] perovskites. This process, which employs titanium acetate, tends to establish a chemically bound network in the pre-annealed phase and facilitates the crystallization of fe…
The oxidation of both low and high-activity simple and Pt-modified aluminide coatings on nickel base superalloy IN738 has been studied in static air at 1100 °C up to 1000 h. For all coatings oxidation followed a parabolic law up to 400 h. The two Pt-modified coatings showed better protectiveness with lower mass gains…
Dielectric properties and lattice parameters of nonstoichiometric strontium titanate were systematically investigated. The X-ray diffraction measurements indicated the formation of SrO·(SrTiO 3 ) n ( n =4-53) instead of SrTiO 3 with excess Sr. Epitaxial films grown on (111)Pt/(100)MgO by an ArF excimer laser ablation…
Several homologous series of liquid crystals having an aminoketone mesogenic core (Liq. Cryst., 10, 593 (1991)), have been synthesized to derive some new wide-temperature untilted smectics. Compounds belonging to three of six novel series have the hexatic smectic B phase between smectic A and enantiotropic crystal sme…
The cavitation damage resistance of several fiber reinforced polymeric composite systems was evaluated before and after seawater immersion via a modified ASTM G-32 method utilizing a stationary specimen. For both dry and saturated condi tions, a carbon fiber/thermoplastic toughened epoxy matrix composite (IM7/977-2T)…
Abstract In Part I of this work, experimental data showed that the effect of low concentrations of free radical initiator injected into polyethylene during extrusion depended upon the degree of unsaturation and branching in the feed as well as the molecular weight. This paper shows attempts to quantitatively explain t…
This paper presents a formulation in dimensionless terms of the equations pertaining to first‐order processes that follow Arrhenius kinetics, and applies them to problems in food thermoprocessing. the need for it arose from attempts to understand the relation between destruction of pathogenic microorganisms and format…
Transmission electron microscopy on Mg-end member majorite crystals synthesized at 22 GPa and above 2350°C reveals a modulated microstructure, characterized by mutually intersecting linear contrasts parallel to the tetragonal {101} planes, with a typical wavelength of the modulation between 150 and 300 A. Streaking pe…
Summary A non‐isothermal method for determination of diffusional parameters was developed. the dependence of diffusivity on temperature was described by an Arrhenius type equation, with the pre‐exponential factor and the activation energy as parameters. These parameters were obtained by optimization of the fit between…
Abstract The solubility behaviour of β‐cyclodextrin in aqueous mixtures was studied by determining the interactions between the co‐solvent and water. Three clear classes of co‐solvent are evident. In the first, including ethanol, tetrahydrofuran and acetone, there is formation of clathrate hydrates by the co‐solvent.…
A factor which determines the network structure of diborate glasses containing divalent cations was proposed on the basis of structural studies by a combination of diffraction methods (x-ray and neutron), computer simulation and Raman spectroscopy. Structural analysis revealed that the network of Ba0.2B 2 O 3 and Pb0.…
Factors contributing to the variations in the Cu(I)-Cu(I) distances in two clusters with identical ligand and coordination geometries have been analyzed. While the hexamer, 4, exhibits metal-metal distances in the range 2.81-3.25 Angstrom, shorter contacts are found in the corresponding tetramer, 3 (2.60-2.77 Angstrom…
SUMMARY The micromorphology of eluvial and glossic areas with weak soi1, strength from the upper fragipan, and the upper parts of grey polygonal zones, in some argillic brown earths (Glossic Fragiudalfs) from north‐east England shows unstable void walls stripped of clay with remnants of ferri‐argillans, pale grey grai…
We used consolidation (hot pressing) and deformation (die upsetting) techniques to produce magnetically anisotropic permanent magnets from melt-spun PryCo100−y−xCx alloys. The primary phase in these magnets (16≤y≤24 at. %) was the hexagonal PrCo5 phase. The greatest alignment was obtained for low-carbon compositions (…
The effects of anodization temperature on the photoluminescence (PL) spectrum of porous silicon (Si) have been studied. The luminescence intensity increases exponentially and the peak wavelength decreases monotonically with increasing anodization temperature during formation of pores on Si. The PL intensity increases…
Leach characteristics of some typical nuclides such as cesium, strontium, cobalt, I−, and CO3−2 from ordinary portland cement waste forms have been studied using the ISO test method and radiotracers of the respective nuclides, i.e., 134Cs, 85Sr, 60Co, 131I, and 14C. The leach studies suggest a rapid release of radioac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLinear viscoelastic diffusion in the polystyrene/ethylbenzene system: differential sorption experimentsG. F. Billovits and C. J. DurningCite this: Macromolecules 1993, 26, 25, 6927–6936Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProbing the influence of local coordination environment on ligand binding in nickel hydrogenase model complexesMikyung Cha, Christine L. Gatlin, Susan C. Critchlow, and Julie A. KovacsCite this: Inorg. Chem. 1993, 32, 25, 5868–5877Publication Date (Print):December 1, 1993Pub…
Abstract Changes in properties of PVC compounds upon weathering are categorized as due to physical aging or due to chemical change. PVC's tensile strength, flexural strength, tensile modulus, and flexural modulus generally rise slightly with weathering. DSC data on weathered samples show an annealing effect identical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupramolecular photochemistry of crystalline host-guest assemblies: absolute asymmetric photorearrangement of the host componentTai Y. Fu, Zhaoqing Liu, John R. Scheffer, and James TrotterCite this: J. Am. Chem. Soc. 1993, 115, 25, 12202–12203Publication Date (Print):Decembe…