Materials Literature
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The mechanism of ozone generation in the silent discharge of air-fed ozonisers is studied theoretically and experimentally. The nitrogen oxides (NO x ) formed in the silent discharge have been found to play an important role in the process of ozone generation due to the catalytic cycle for O 3 destruction: NO+O 3 to N…
The Raman spectra of 4-pyridine-carboxaldehyde-doped Al-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$-Ag tunnel junctions evaporated onto Ca${\mathrm{F}}_{2}$ films and optical diffraction gratings show that the molecular Raman scattering is strongly enhanced under conditions which permit the direct excitation of the surface…
Abstract Suitable chemical treatment of North Sea oil and gas production plays a small but vital role in determining the production plays a small but vital role in determining the success of the project. During the initial period of production from a new oilfield, the chemical treatment requirements are generally mini…
This Letter presents x-ray studies of freely suspended smectic liquid-crystal films from 2 to >100 layers thick. Smectic-$B$ thick films of butyloxybenzylidene octylaniline (40.8) have three-dimensional long-range order while thin films are two-dimensional crystals. Large diffuse scattering is observed from soft sh…
Abstract The effect of moisture on the glass transition temperature of poly(hydroxy methylene) was investigated by thermal analysis which entailed combinations of DTA and DSC with TGA techniques. As the moisture content increased, the glass transition temperature ( T g ) decreased monotonically from a value ( T go ) o…
Critical specifications of Thor, an old assembly of thorium-reflected plutonium, have been refined. These specifications are brought together with void coefficients, Rossi-alpha values, fission traverses, and spectral indices.
The fusion-fission hybrid blanket proposed for the Tandem Mirror Hybrid Reactor employs thorium metal as the fertile material. Based on the ENDF/B-IV nuclear data, the /sup 233/U and tritium production rate and blanket energy multiplication averaged over the blanket lifetime of about 9 MW-yr/m/sup 2/ are 0.76 and 1.12…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFunctionality and Structure of Polymers. 3. Synthesis and Thermal Properties of Polymers Having a Dianthracene Main ChainShigeo Tazuke and Toshio TanabeCite this: Macromolecules 1979, 12, 5, 848–853Publication Date (Print):September 1, 1979Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatistical Properties of Alternating Copolymers. 1. Dipole Moments of Poly(thiodiethylene glycol) ChainsE. Riande and J. GuzmánCite this: Macromolecules 1979, 12, 5, 952–956Publication Date (Print):September 1, 1979Publication History Published online1 May 2002Published ini…
"Snapping and Shaky Antiprisms." Mathematics Magazine, 52(4), pp. 235–236
The pyrochlore-type compound Cd 2 Ti 2 O 5 F 2 and the perovskite-type CdTiO 3 were prepared by the reaction of CdF 2 with TiO 2 at high temperatures. The techniques used for the growth of single crystal are presented. A study was carried out the dielectric properties of single crystal specimens. No evidence for ferro…
A new stoichiometric compound of Nd, K5NdLi2F10has been synthesized and its spectroscopic and lasing properties are reported. The material is characterized by a room temperature decay time of 300 μs, increasing to 500 μs in diluted samples. This represents the least amount of concentration quenching reported in this c…
Abstract The linear viscoelastic limit of poly(methyl methacrylate) (PMMA) is established on the basis of the Reiner‐Weissenberg criterion of strength. The obtained limit is not simply a “strainlimit” or a “stress‐limit” but a function of both strain and stress, an energetical limit. In stress‐strain representation th…
Ten 4-hydroxy and 4-alkoxy benzoic and phenylalkanoic acids have been investigated. Solubilities in aqueous buffer at pH 1.2 were determined, together with distribution coefficients between the buffer and either octanol or isopropyl myristate. When plotted against the total number of carbon atoms in the side chains, l…
Isotope effect on dissociation behavior of uranium hydride has been studied. The equilibrium dissociation pressure of uranium protide(UH3), deuteride (UD3), and of equimolar mixture of both hydrides are measured. The dissociation pressure of deuteride is higher than that of the protide by a factor of about 2 at 400°C…
Summary Eleven specimens of natural or synthetic truscottite or gyrolite-truscottite intergrowth were studied by analytical electron microscopy and X-ray powder diffraction. The results suggest that, in absence of substitution, the formula of truscottite is Ca 14 (Si 24 O 58 )(OH) 8 · ∼ 2H 2 O. Truscottite can accommo…
A study was made of the growth and characterization of ruthenium dioxide single crystals. The optimum conditions for the growth of sound crystals by the transport and oxidation of ruthenium metal are given. The relationship of the growth conditions to crystal habit, stoichiometry, lattice constant, and resistivity is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn XPS study of the relative .pi.-acceptor abilities of the nitrosyl and carbonyl ligandsH. W. Chen and William L. JollyCite this: Inorg. Chem. 1979, 18, 9, 2548–2551Publication Date (Print):September 1, 1979Publication History Published online1 May 2002Published inissue 1 S…
Abstract Eight samples of high‐density polyethylene with weight‐average molecular weights ranging from 5.5 × 10 4 to 17.3 × 10 4 have been studied. In addition to GPC molecular weight characterization, the recoverable compliance, the shear viscosity, and the extrudate swell were determined at temperatures between 138…
Abstract Unmodified cotton and cottons finished with high levels of seven different phosphorus‐containing flame retardants were pyrolyzed in a temperature‐programmed solid probe of a mass spectrometer, and mass spectra were recorded continuously throughout the pyrolyses. The spectra at the maximum rates of volatiles e…