Materials Literature
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Isocitrate lyase was isolated in homogeneous state from a thermophilic Bacillus. The enzyme has a mol.wt. of 180000 and a pI of 4.5 and contains threonine as the N-terminal residue. It resembles in size the cognate enzyme from the mesophilic bacterium Pseudomonas indigofera, but is smaller than the enzyme from the euk…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProcess Variable Effects in the Conversion of Methanol to Gasoline in a Fluid Bed ReactorDavid Liederman, Solomon M. Jacob, Sterling E. Voltz, and John J. WiseCite this: Ind. Eng. Chem. Process Des. Dev. 1978, 17, 3, 340–346Publication Date (Print):July 1, 1978Publication Hi…
The RISM equation is used to study the local structure of acetonitrile. The theoretical calculations predict neutron and X-ray scattering structure factors that are in good agreement with experiment. The following conclusions are drawn from this study. (1) Dipole-dipole interactions play, at most, a minor role in form…
Room-temperature continuous operation (cw, 300 °K) of photopumped AlxGa1−xAs-GaAs-AlxGa1−xAs quantum-well heterostructure lasers embedded in Cu under diamond windows is demonstrated. The quantum-well heterostructures are grown by metalorganic chemical vapor deposition (MO-CVD) and possess undoped (nd−na≲1015/cm3) or c…
In systems with pronounced resonance conditions and a low degree of damping, temporary overvoltages may develop when transformers are switched in or at fault clearing. Overvoltages can occur e.g. in generator networks feeding HVDC stations and in high voltage cable systems.
Abstract Thermodynamic parameters derived from experimental results were determined for the potassium‐calcium and magnesium‐calcium exchange reactions on a kaolinitic soil clay separated from the B horizon of a strongly weathered soil profile. The clay samples were equilibrated at 10° and 30°C with a mixed solution of…
The relationship between the total loss under tensile stress and the tilt angle of the [001] out of crystal surface β was studied in 3 percent Si-Fe single crystals. The total loss largely depends upon β. When β is about 2°, the total loss under tensile stress is the smallest, and the decrease of the total loss due to…
The effects of 20 oxide dopants on the microstructure development of Mn‐Zn ferrite during sintering were investigated by diffusion‐couple‐like experiments. Nine oxides enhanced grain growth in ferrite; the effects of TiO 2 dopant were studied in detail. The TiO 2 ‐induced exaggerated grain growth shows a parabolic tim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNature of naked-metal-cluster polyanions in solution. Evidence for (Sn9-xPbx)4-(x = 0-9) and tin-antimony clustersR. W. Rudolph, W. L. Wilson, F. Parker, R. Craig Taylor, and D. C. YoungCite this: J. Am. Chem. Soc. 1978, 100, 14, 4629–4630Publication Date (Print):July 1, 197…
Abstract The pressure–volume–temperature (PVT) properties of a commercial polysulfone derived from bisphenol A and 4,4′‐dichlorodiphenylsulfone are studied experimentally and theoretically in the temperature range 30–370°C and for pressures to 2000 kg/cm 2 . PVT surfaces are determined for an annealed glass, formed un…
The inherent texture and unique Burgers vector in h.e.p. zircaloy tubing should confer anisotropic creep properties on the material. The results of an experiment designed to measure the anisotropy of irradiation creep using pressurized tubes are analysed in terms of a texture-dependent model based on glide. The predom…
Zinc chloride glass is a potentially useful medium for ultralow-loss (∼1 dB/103 km) optical fibers for wavelengths in the 3.5–4-μm region. In this region, intrinsic absorption, scatter, and material dispersion are all expected to be small, and the common fully oxidized transition metal impurities and H2O should exhibi…
Solid-state physicists are turning more and more to complex synthetic materials in their search for novel phenomena and potentially useful properties. Many of these materials are highly anisotropic, so that interatomic interactions can for all practical purposes be neglected along one or two crystal axes. One of the o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of Polymer CompatibilityDonald Patterson and Andrée RobardCite this: Macromolecules 1978, 11, 4, 690–695Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 July 1978https://pubs.acs.org/doi/10.1021/ma60064a015…
It is known that the Lifshitz condition is not a necessary condition for second-order phase transitions in crystals. We show, however, that a certain necessary condition (which we have termed "the weak Lifshitz condition") does exist, though much weaker than the original Lifshitz condition. This necessary condition im…
Abstract The melting or plasticating behavior of seven commercial polymers (high density polyethylene, low density polyethylene, polypropylene, polyoxymethylene copolymer, polystyrene, poly(methyl methacrylate), and polycarbonate (PC) was investigated using an experimental apparatus specifically designed to measure th…
Anodic films on titanium formed in a perchloric acid‐acetic acid electropolishing electrolyte were investigated by Auger electron spectroscopy (AES) depth profile analysis. Films formed in at different potentials were used as standards for determining sputter rate and stoichiometry. Obtained results show linear film g…
The role of electrochemically coprecipitated cobalt hydroxide and nickel hydroxide has been investigated at a nickel microelectrode for purposes of elucidating the effect of cobalt hydroxide on the electrode reactions of battery active nickel hydroxide. Hydroxide films were deposited onto the electrode surface from bo…
A frequent observation in metal oxidation is the development of subparabolic kinetics, variously described as cubic or quartic. Although a number of detailed mechanisms have been proposed to account for this effect, none seem generally applicable. This paper presents a model of the oxidation process which is divorced…
A simple extension of Hill’s formulation for anisotropic plasticity which accounts for the distortion of the yield surface, Mij, the strength differential between tension and compression, αi and the effective size of the loading surface, k, has been proposed. These material parameters, Mij, αi, and k, define the initi…