Materials Literature
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The domain structure immediately after heat treatment was investigated by the nematic liquid crystal method. Just below T c very fine domain patterns narrower than 0.5 µm in width were observed. With time, the domain pattern gradually becomes coarse. Mean domain width grows in proportion to the time elapsed since the…
An experimental study has been made of the manner in which microfractures initiate and grow along adiabatic shear bands formed in the titanium alloy Ti–6AI–4V by the normal impact of hard steel spheres at velocities up to 340 m s−1. It is suggested that a critical shear strain must be exceeded along the shear bands fo…
Abstract Data from three plant growth studies conducted in controlled environments with seven phosphate rocks (PR) and 18 soils demonstrated how and to what degree selected PR and soil characteristics influence rock phosphate release. Rock phosphate release was calculated as the sum of the increase in plant P uptake a…
Fabrication techniques are investigated with a view to producing single phase perovskite lead indium niobate (PbIn1/2Nb1/2O3). The physical properties of ceramics produced using the various techniques are investigated. The dielectric relaxation of lead indium niobate is also characterised.
Abstract With the wide variety of elastomers, fillers, and other compounding ingredients available today, there is increasing demand for rubber compounds with specific properties. The systematic development of the desired rubber compound can be undermined by the exposure of the compound to oxygen and ozone during use.…
The absorption and photoluminescence of lattice defects and of the cerium ion (Ce+3) in cerium-doped yttrium aluminum garnet have been measured after annealing single crystals of this material in various reducing atmospheres. The absorption in the 200–300-nm wavelength range is observed to decrease as the partial pres…
The effects of rare‐earth oxide additions on the oxidation of sintered Si 3 N 4 were examined. Insignificant oxidation occurred at 700o and 1000oC, with no evidence of phase instability. At 1372oC, the oxidation rate was lowest for Y203 and increased for additions of La 2 O 3 , Sm 2 O 3 , and CeO 2 , in that order. Da…
Abstract A leaching experiment was designed to evaluate the chemical, mineralogical, and morphological nature of precipitation products formed during the accelerated laboratory weathering of an alkaline fly ash. The ash, classified as alkaline Modic, was leached with 0.005 mol L −1 H 2 SO 4 in a series of five leachin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCleavage of ruthenium and osmium porphyrin dimers: formation of organometallic ruthenium porphyrin complexes and highly reduced metalloporphyrin speciesJames P. Collman, P. J. Brothers, L. McElwee-White, E. Rose, and L. J. WrightCite this: J. Am. Chem. Soc. 1985, 107, 15, 45…
Desorbed gases from insulator surfaces may be much more important in flashover initiation than properties of the dielectric surface. Ambient neutral densities, immediately above the insulator surface, in the initial stages of flashover have been calculated to lie in the range from 2×1017/cm3 to 2×1021/cm3 with a mean…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyaza cavity shaped molecules. 4. Annelated derivatives of 2,2':6',2"-terpyridineRandolph P. Thummel and Yurngdong JahngCite this: J. Org. Chem. 1985, 50, 14, 2407–2412Publication Date (Print):July 1, 1985Publication History Published online1 May 2002Published inissue 1 Ju…
Abstract The melt flow behavior of thermoplastic polypropylenenatural rubber blends has been evaluated with specific reference to the effects of blend ratio, extent of dynamic crosslinking of the rubber phase and temperature, on viscosity, flow behavior index, and deformation of the extrudate. The proportion of rubber…
Moisture from perspiration collects in and passes through clothing as worn, and the properties of clothing fabrics influence both the collection and passage of this moisture. The selection and measure of moisture properties that relate to comfort in wear has proved to be more difficult than first perceived. Dynamic su…
Glass formation in the system Ln 2 O 3 ‐B 2 O 3 (Ln = Nd, Sm) was studied. Glasses could be formed in the range from 0 to ‐28 mol% rare‐earth oxide (Ln 2 O 3 ), but liquid immiscibility in these systems limits the range of homogeneous glasses to 0 to 1.5 and 25 to 28 mol% Ln 2 O 3 . The infrared spectra indicate that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic details of the heterogeneous decomposition of ammonia on platinumJ. J. Vajo, W. Tsai, and W. H. WeinbergCite this: J. Phys. Chem. 1985, 89, 15, 3243–3251Publication Date (Print):July 1, 1985Publication History Published online1 May 2002Published inissue 1 July 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of reductive dioxygen activation catalyzed by P-450 model system. Iron picket fence as a catalytic centerIwao Tabushi, Masahito Kodera, and Masataka YokoyamaCite this: J. Am. Chem. Soc. 1985, 107, 15, 4466–4473Publication Date (Print):July 1, 1985Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInitiation of polymerization with ultrasound in methyl methacrylateP. Kruus and T. J. PatraboyCite this: J. Phys. Chem. 1985, 89, 15, 3379–3384Publication Date (Print):July 1, 1985Publication History Published online1 May 2002Published inissue 1 July 1985https://pubs.acs.org…
A long-term-sampling evaluation was made of the quantity, discharge pathway, and chemical form of 14C released from 2 pressurized water reactors (PWR) and 1 boiling water reactor (BWR) in the northeastern United States. For the R. E. Ginna PWR the discharge rate of gaseous 14C was 11.6 Ci/GW(e)-yr. Venting of gas deca…
The polarization effect of one or several tilted, parallel air-spaced fused silica plates is calculated. It is generally necessary to include higher order reflections. A device consisting of 1–4 plates tilted 10–45° from normal incidence is proposed for the calibration of differential linear dichroism (LD) in the meas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInsertion and oxidative addition reactions of rhodium porphyrin complexes. Novel free radical chain mechanismsRalph S. Paonessa, Nicholas C. Thomas, and Jack HalpernCite this: J. Am. Chem. Soc. 1985, 107, 14, 4333–4335Publication Date (Print):July 1, 1985Publication History…