Materials Literature
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CaO–MnO samples have been prepared by thermal decomposition of mixed carbonates and annealing of the resulting oxide mixtures at 1273 and 1523 K in vacuo. Cooled samples have been ground in vacuo and transferred for X-ray powder diffraction analysis and e.p.r. analysis without exposure to the atmosphere. Lattice param…
A brief summary is presented of the known effects of hydrogen on metals, especially degradation and embrittlement. Practical problems involving hydrogen are surveyed. Résumé On présente un bref résumé des effets connus de l'hydrogène sur les métaux, surtout en ce qui a trait à la dégradation et la fragilisation de ceu…
Abstract Garnet high temperature solutions, their solvents and binary systems consisting of lead oxide and one component out of the solute were investigated. The shear viscosity coefficients have been measured in a cylindrical rotation viscometer within the temperature range of liquidus or melting and not exceeding 12…
The behaviour of (i) the luminescence spectrum, (ii) the (relative) luminescence quantum yield and (iii) the luminescence lifetime of [Os(phen)3]2+(phen = 1,10-phenanthroline) and [with respect to (ii) and (iii)] of [Os(bipy)3]2+(bipy = 2,2′-bipyridine), has been examined in the temperature range 77–300 K, principally…
Abstract
Abstract γ Ag 8 GeTe 6 belongs to space group F [unk]3 m with Z = 4 and a = 11.58 ± 0.02Å. The arrangement of the tellurium atoms is almost precisely that of both the magnesium and copper atoms in the Friauf-Laves cubic phase of MgCu 2 . This arrangement produces 136 tetrahedra per unit cell, of which four are occupie…
The ballistic penetration behaviour of a high-strength aluminium alloy, 7001 T6, was investigated and targets of the alloy were found to fail in two modes, discing or plugging, depending on the orientation of the target in relation to the extrusion direction of the round bar from which it was cut. The dependence of fa…
The structure of hexabromobenzene, C6Br6, has been determined at 300 K by neutron powder diffraction. The crystal is monoclinic, a = 15.357 (4), b = 4.007 (1), c = 8.364 (2) Å, β = 92.65 (2)°, space group P21/n, Z = 2. The problem is well suited for a constrained refinement with the program EDINP. Within the accuracy…
Hot corrosion is the accelerated rate of oxidation of coatings and substrates, which occurs when a condensed phase is present on the surface. The major constituent of the corrosive deposit is sodium sulfate, although when fuels other than light distillates are employed, the deposit can contain various amounts of vanad…
In spite of its known shortcomings as a fuel for spark ignition engines, acetylene has been suggested as a possible alternative to petroleum-based fuels since it can be produced from non-petroleum resources (coal, limestone and water). Therefore, acetylene was evaluated in a single-cylinder engine to investigate perfo…
The corrosion rate of commercial grade, coid-rolled nickel in 50%v/v (5·6 M) hydrochloric acid, with and without the presence of thiourea or one of several of its derivatives, has been studied by gravimetric and electrochemical methods over the temperature range, 23–79°c. All the compounds exhibited some ability to in…
Abstract Solution‐melts based on PbF 2 —B 2 O 3 and Bi 2 O 3 —B 2 O 3 were used in studying the stability regions and for growth, by way of spontaneous crystallization, of crystals up to 3 mm in size of twelve compounds having the general formula RGa 3 (BO 3 ) 4 . All of these compounds are isostructural with carbonat…
The refractive indices in the nematic and isotropic phases have been determined for the pnbutoxy-and p-n-amyloxybenzoic acids. The orientational order parameter in the nematic phase has been calculated for both the compounds using Vuks formula. The variation of order parameter with respect to reduced temperature for b…
Tension specimens of 6061 aluminum alloy (nominally 1Mg-0.6Si) were heat-treated to give fully annealed (“0” temper) and precipitation-hardened (“T6” temper) conditions, and were irradiated in water at 328 K (0.35 Tm) to fast (>0.1 MeV) fluences up to 1.8 × 1027 neutrons/m2 and thermal (<0.025 eV) fluenc…
Infrared and Raman spectra of CO[dbnd] 3 ions are different in the two crystallographic forms of CaCO3 Calcite and Aragonite owing to their different site symmetries. Due to this fact, i.r. has been used to assess the reversible Calcite ← → Aragonite transformation which occurs upon grinding of CaCO3, and much work ha…
Acoustical detection of electrical discharges was perhaps the earliest technology used by man as he became aware of lightning flashes and the associated sound of thunder during rainstorms. Presumably, for millions of years man knew that the sound of thunder gave an early warning of an approaching storm (Lucretius (95-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Scission and Cross-Linking in the Radiation Degradation of Polymers: Limitations on the Utilization of Theoretical Expressions and Experimental Results in the Pregel RegionJ. H. O'Donnell, N. P. Rahman, C. A. Smith, and D. J. WinzorCite this: Macromolecules 1979, 12, 1…
摘要 Abstract 作者及机构信息 李方华, 范海福 1. 中国科学院物理研究所 Authors and contacts LI FANG-HUA, FAN HAI-FU 1. 中国科学院物理研究所 参考文献 [1] 施引文献
Abstract Mit kontinuierlichen Heizguinieraufnahmen wurde die Dehydratisierung von ZnSO 4 · 7 H 2 O und das Hochtemperaturverhalten von wasserfreiem ZnSO 4 untersucht. Der Abbau von ZnSO 4 · 7 H 2 O verläuft an der Luft über das 6‐Hydrat, eine unbekannte Hydratphase und das 1‐Hydrat zum N‐ZnSO 4 , der Normaltemperaturf…
The effects of boron, titanium, and nitrogen contents on the hardenability of boron-bearing steels have been studied. The boron hardenability factor was found to be a rapidly decreasing function of (total N – N as TiN). Thus, it was confirmed that titanium plays a very important role in retaining the excellent hardena…