Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the second-order polarizability of conjugated .pi.-electron molecules with octupolar symmetry: the case of triaminotrinitrobenzeneJ. L. Bredas, F. Meyers, B. M. Pierce, and J. ZyssCite this: J. Am. Chem. Soc. 1992, 114, 12, 4928–4929Publication Date (Print):June 1, 1992Pu…
π-Stacking interactions in the nearly parallel 3,6-bis(2-pyridyl)-pyridazine (dppn) ligands probably account for the distortion of the planar Cu4 unit in 1 from a square to a rhombus. Each Cu atom is surrounded in a tetrahedral fashion by two N atoms from pyridine and two N atoms from pyridazine units; the chelate rin…
Abstract The hydrolytic degradation of polycarbonate resins is a first‐order process in terms of the decrease in average molecular weights under a relative humidity (RH) and temperature. Two analysis procedures have been developed for making life‐cycle predictions of polycarbonate at any combination of humidity and te…
Thermally induced weight loss in the 100–700C range and length changes in the 25–450C range were monitored in wool fibers obtained from three different breeds of sheep, viz. Lincoln, Chokla, and Merino. Merino wool showed higher thermal expansion above its glass transition temperature, a broad and weak melting peak, a…
New online monitoring techniques have been developed for use on HV systems. An online testing device was developed to measure partial discharge and dielectric loss angle (DLA) of in-service HV instrument transformers and is used as a fast screening device. A continuous DLA monitor for in-service transformer bushings a…
The thermal‐imaging floating zone technique can be used to grow crystals of yttrium iron garnet (Y 3 Fe 5 O 12 ), aluminum‐doped yttrium orthoferrite (YFe 0.88 Al 0.12 O 12 ), and magnetite (Fe 3 O 4 ), which represent peritectic compounds, solid‐solution crystals, and atmosphere‐sensitive materials, respectively. The…
Well-known design rule for AC power apparatus insulation cannot be applied to HVDC insulation design in many cases. It has to be taken into account that electric field distributions are quite different from AC distributions due to the resistivity of the materials. Additionally, polarity reversals and transients result…
Size‐dependent quantum confinement effects have been invoked to explain the occurrence of vislble luminescence in porous silicon and TEM data supports the existence of crystalline Si domains which have dimensions small enough that one could expect such phenomena. However, is this the whole story? Various proposed expl…
Comparing Electrochemical Impedance Spectroscopy Methods for Estimating the Degree of Delamination of Organic Coatings on Steel, McCluney, S. A., Popova, S. N., Popov, B. N., White, R. E., Griffin, R. B.
Structural phase transitions in Cu2–x Te crystals have been investigated by high-temperature X-ray diffraction. At room temperature Cu2Te and Cu1.90Te specimens are two-phased, i.e. they consist of an orthohombic phase with a = 7.319, b = 22.236, c = 36.458 Å and a hexagonal phase with a = 4.150, c = 7.188 Å. The chan…
In the cofermentation of glycerol with a sugar by Lactobacillus brevis and Lactobacillus buchneri, a 1,3-propanediol:NAD+ oxidoreductase provides an additional method of NADH disposal. The enzyme has been purified from both L. brevis B22 and L. buchneri B190 and found to have properties very similar to those reported…
Abstract Fast thermolysis studies of ammonium nitrate (AN) and its mixtures with magnesium and activated charcoal have been carried out by the Fourier transform infrared spectroscopy/temperature profiling technique. When subjected to rapid heating (ca. 80°C/s), AN Sublimes/decomposes around 300°. Sublimation dominates…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic behavior, phase equilibria, and microdomain morphology in mixtures of a block copolymer and a homopolymerChang Dae Han, Deog Man Baek, Jinhwan Kim, Kohtaro Kimishima, and Takeji HashimotoCite this: Macromolecules 1992, 25, 12, 3052–3067Publication Date (Print):J…
The properties of amorphous BaTiO3 thin films deposited on Si substrates were studied as functions of annealing temperature. The film thickness decreased monotonically as the annealing temperature increased up to 600 °C. This reduction is believed to correlate with the densification process observed in the amorphous f…
The variation in the a cell edge unit cell, degree of inversion, O positional parameter and thermal parameters have been determined for samples annealed at temperatures between 800 and 1500°C by Rietveld refinement using X-ray powder diffraction data.
Abstract The lifetime of the electrochromism of the WO 3 –TiO 2 films prepared by vacuum evaporation is found to exceed that of WO 3 films by a factor of five. X‐ray diffraction has revealed that the crystal structure of WO 3 –TiO 2 films stays amorphous, while crystalline compounds are formed in amorphous WO 3 films…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic nickel-containing heterometal cubane-type clusters with NiFe3Q4 cores (Q = sulfur, selenium)Stefano Ciurli, Paul K. Ross, Michael J. Scott, Shi Bao Yu, and R. H. HolmCite this: J. Am. Chem. Soc. 1992, 114, 13, 5415–5423Publication Date (Print):June 1, 1992Publicati…
The distributions of many diatom taxa in the Pyrenean springs show remarkable affinities with other areas. Soft water springs have many species of boreoalpine distribution, while diatom communities inhabiting the calcareous springs possess noticeable similarities with temperate calcareous areas. Water mineral content…
On the basis of experimental results, a model describing the composition and the structure of water trees is derived. It is concluded that water trees are in fact salt trees, i.e., they consist of tracks of hydrophilic salt groups. These tracks most likely run through the amorphous phase of polyethylene. In water tree…
The diffusion-governed melting that occurs when a binary melt is placed in contact with a pure solid is described. It is shown that if the melt superheat is much greater than the solid supercooling, the melt composition at the interface equals that of the solid and so the solid will melt at a rate determined by the th…