Materials Literature
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Detailed thermal activation analysis has been carried out on experimental data for the plasticity of polycrystalline titanium containing 0·06–1·6 at.% O in the temperature range 4·2–600 K. The analysis of the dislocation-impurity interaction parameters took into consideration the variations in the shear modulus and in…
In spite of extensive optimizations of transformer core designs, investigations of full sized cores showed distinct inhomogeneities of flux density B. Limbs showed discontinuous variations of B in peripheral packages and minima of B in thick central ones. The latter are not caused by global eddy currents but rather by…
Two-dimensional negative-temperature systems described by means of analytical solutions of the Poisson–Boltzmann equation are investigated. It is shown that two kinds of doubly periodic self-consistent structures can exist. The structures obtained confirm the prediction of equilibrium statistical mechanics that no spa…
A major control strategy for dilute waste streams of volatile organic compounds (VOCs) in air is incineration. However, no single incineration technology will likely serve as the optimal solution for all applications. In addition, with increasing VOC regulation, more variations of incineration or oxidation systems are…
Abstract It has been suggested that interlayer water in halloysite is due to the presence of hydrated cations that balance the negative layer charge produced by Al for Si substitution. To find evidence of 4-coordinate Al (Al(IV)), we investigated six halloysites and two kaolinites using ‘high-field’ and ‘medium-field’…
Structural, optical, dielectric, and pyroelectric properties of crystals and ceramics of BaAl2O4 have been investigated. A refinement of the atomic positions has been carried out from X-ray powder diffraction data. BaAl2O4 is ferroelectric with TC=396K. The thermal behavior of Ps shows a broad maximum close to 220K wi…
Specific patterns of attacks of cotton, bacterial cellulose and bacterial microcrystalline cellulose (BMCC) by recombinant cellulases of Cellulomonas fimi were investigated. Molecular-size distributions of the celluloses were determined by high-performance size-exclusion chromatography. Chromatography of cotton and ba…
In the range of high strain rates, the mechanical behaviour of materials is characterized by an increased strain rate sensitivity, by increasing effects of mass inertia forces and by the adiabatic character of the deformation process. For the relation between stress, strain and strain rate, empirical formulae are now…
In this work, the possibilities of splitting tests (Brazilian tests) to determine the mechanical properties of ceramic materials at high strain rates are analyzed. The study is based on the mechanical characterization of cylindrical specimens in the Hopkinson bar and the use of a high speed camera to observe the failu…
Immunoscreening and DNA hybridization were used to isolate a 1.72-kilobase pair cDNA encoding cytosolic NADP(+)-dependent isocitrate dehydrogenase from a rat liver, lambda gt11 cDNA library. The identity of the cDNA was confirmed by comparison of the deduced amino acid sequence with sequences of peptides obtained from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonitoring the cellular response of Stichococcus bacillaris to exposure of several different metals using in vivo 31P NMR and other spectroscopic techniquesWeixing. Zhang and Vahid. MajidiCite this: Environ. Sci. Technol. 1994, 28, 9, 1577–1581Publication Date (Print):Septem…
"Model compounds ul-1 and lk-1 have been studied to determine both the position of the silicon electrofuge and the relative orientation of the double bonds in the transition structure of the allylmetal- aldehyde condensation. The use of the deuterium label allows an unbiased assessment of the syn versus anti SE' pathw…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of Stability and Reactivity of Synthetic Cryptomelane-like Manganese Oxide Octahedral Molecular SievesYuan-Gen Yin, Wen-Qing Xu, Roberto DeGuzman, Steven L. Suib, and C. L. O'YoungCite this: Inorg. Chem. 1994, 33, 19, 4384–4389Publication Date (Print):September 1, 19…
Two genes encoding the enzymes malate synthase G and glycolate oxidase, have been linked to locus glc (64.5 min), responsible for glycolate utilization in Escherichia coli. The gene encoding malate synthase G, for which we propose the notation glcB, has been cloned, sequenced and found to correspond to a 2262-nucleoti…
During the manufacturing of present-day integrated circuits, certain measurements must be made of the submicrometer structures composing the device with a high degree of repeatability. Optical microscopy, scanning electron microscopy, and the various forms of scanning probe microscopies are major microscopical techniq…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular dynamics simulation of atactic polystyrene. 2. Comparison with neutron scattering dataHidemine Furuya, M. Mondello, Hyung-Jin Yang, Ryong-Joon Roe, R. W. Erwin, C. C. Han, and S. D. SmithCite this: Macromolecules 1994, 27, 20, 5674–5680Publication Date (Print):Sept…
Having studied scientific publications of the last 75 years, the author compares and contrasts developments in shape description across many disciplines as well as the strengths and weaknesses of available techniques. Uses numerous illustrations and copious examples to explain quantification of 2-D shape without mathe…
Abstract Measurements of cutting resistance have been made for a crosslinked styrene—butadiene copolymer over a wide range of cutting speeds and temperatures. A characteristic fracture energy was determined using the procedure of Lake and Yeoh. A lower limit, about 150 J/m 2 , was obtained at low cutting speeds. This…
The crystal structures of synthetic 7 angstrom and 10 angstrom manganates, synthetic birnessite and buserite, substituted by mono- and divalent cations were investigated by X-ray and electron diffractions. The monoclinic unit cell parameters of the subcell of lithium 7 angstrom manganate, which is one of the best orde…
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