Materials Literature
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The compositions M II M 2 III ( S , Se ) 4 where M II = Eu , , Ca , Sr , Ba and M III = Al , Ga , In were prepared by reaction of the elements in evacuated silica tubes with iodine as a mineralizer. All members except Ba ( Ga , Al ) 2 S 4 , which is cubic, exhibit the pseudo‐orthorhombic PbGa 2 Se 4 type structure. Th…
Abstract The reaction H 2 → 2 H (dissolved) on thin Pd and Pd‐Ag foils (2.5–5 μm) was studied, with the aid of resistance measurements, in a flow apparatus at temperatures in the range 20–150°C. The rate determining step is the dissociation of the H 2 ‐molecule on the metal surface. It is assumed that in the formation…
Mutants requiring threonine plus methionine (or homoserine), or threonine plus methionine plus diaminopimelate (or homoserine plus diaminopimelate) have been isolated from strains possessing only one of the three isofunctional aspartokinases. They have been classified in several groups according to their enzymatic def…
A group of photoluminescent materials, which may have great influence on future fluorescent lamp development, is surveyed. The materials are based on hexagonal aluminates and gallates which are structurally related to the magnetoplumbites and (β‐alumina. When activated with Mn 2+ , Eu 2+ , Tl 2+ , Ce 3+ , and Tb 3+ ,…
Polyvinyl chloride) (PVC) is undoubtedly among the most frequently used plastics; it is widely applied in many branches of the national economy, including industry and building [1]. Its advantages are comparatively high chemical resistance, low production costs, and an almost universal possibility of application as pa…
Description The Symposium on Zirconium in Nuclear Applications was held 21–24 August 1973 in Portland, Ore., and was co-sponsored by the American Society for Testing and Materials (ASTM) Committee B-10 on Refractory Metals and Alloys and by the Institute of Metals Division, The Metallurgical Society of the American In…
Article Preparation and General Properties of Crystalline Penicillin Acylase from Escherichia coli ATCC 11 105 was published on January 1, 1974 in the journal Biological Chemistry (volume 355, issue 1).
Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular ar…
The pressures of SO3 which exist in equilibrium with ferric sulphate have been measured in the temperature range 740 to 975 K by static and dynamic techniques. The overall equilibrium may be described by the two equations Fe2(SO4)3⇌Fe2O3+ 3SO3, 2SO3⇌2SO2+ O2 The equilibrium SO3 pressures above partially sulphated samp…
Above a critical concentration in certain solvents poly-γ-benzyl-L-glutamate (PBLG) forms a lyotropic liquid crystal of the cholesteric structure. In the presence of sufficiently strong electric or magnetic fields this liquid crystal undergoes a mesomorphic phase transition to nematic order. Reported are the results o…
Converted reformer gas on the shell side of a heat exchanger was cooled by water on the tube side. In addition to hydrogen and nitrogen, the gas contained substantial quantities of CO2 and water vapor. The tubes were integral finned of C-steel. Condensate from the gas stream filled the space between fins, while CO2 fr…
En traitant à l'ébullition des mélanges renfermant de l'Hydroxyde d'alumine et des carbonates de magnésium, de nickel ou de lithium, on obtient des composés voisins de l'hydrotalcite. A 60°C, en plaçant les produits initiaux dans des sacs à dialyse, il se forme les mêmes composés associés parfois à des impuretés. Dans…
In this brief survey, the theoretical models for nucleation of new grains in annealed cold-worked metals are reviewed in the light of recent researches in the author's laboratory. The importance of strain-induced boundary migration is gradually emerging. The role of vacancies in enhancing the mobility of grain boundar…
Eleven weak absorption peaks of Fe3+ and two broad absorptions of Cr3+ doped in synthetic yttrium-aluminium-garnets, Y3Al2A13O12, have been assigned to d-d transitions of the metal ions in octahedral and tetrahedral sites. All of these absorption peaks have 1:1 correspondence to transitions which are predicted to occu…
The anisotropic thermal expansion and compressibility coefficients of black phosphorus have been determined by high temperature single‐crystal x‐ray diffraction, by high pressure x‐ray diffraction and by neutron (time‐of‐flight) diffraction and are Ka = 1.5(2), Kb = 15.1(4), Kc = 12.1(4), Kv = 30.2(1.0) × 10−4 kbar−1.…
Ferritic stainless steels containing more than 13% chromium are subject to severe embrittlement, known as the 475° C embrittlement, when heated in the temperature range of 400–550° C. Several experimental and review papers have been published about this phenomenon concerning binary iron–chromium alloys. On the other h…
The corrosion of 3S aluminium (Al-Mn alloy) and its inhibition in solutions of phosphoric acid has been studied. The extent of corrosion increases with increase in acid concentration and with the length of the period of immersion. At 0·5% inhibitor concentration the efficiency of the inhibitors increases in the order:…
Critical-point drying of microorganisms for scanning electron microscopy can be rapidly and effectively accomplished by use of a newly described specimen holder. Up to eight different samples of spores or vegetative cells are placed between polycarbonate membrane filters in the holder and processed through solvent deh…
We investigate here the threshold behaviour of Williams domains and of the dielectric alignment in homeotropic and parallel oriented nematic films for different signs and magnitudes of the dielectric anisotropy. The theoretical predictions of the Helfrich theory are in agreement with the experiment.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation and Prediction of Excess Thermodynamic Functions of Strongly Nonideal Liquid MixturesIsamu Nagata and Toshiro YamadaCite this: Ind. Eng. Chem. Process Des. Dev. 1974, 13, 1, 47–53Publication Date (Print):January 1, 1974Publication History Published online1 May 20…