Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
An algorithm to evaluate depth-dose distributions produced by plane-parallel electron beams normally incident on two- or three-layer slab absorbers has been developed. It is based on a simple model of electron penetration across the interface, and makes use of empirical equations previously formulated as well as ones…
By a PdSO4–heteropolyacid(H3PMo6W6O40)catalyst system in the liquide phase cyclo-olefins, particularly cyclopentene and cyclohexene, are oxidized to the corresponding ketones.
A comprehensive analysis is given for water proton relaxation rates, T–11. and T–12, measured in solutions of Mn–EDTA2–. Protons of water molecules hydrogen-bonded to co-ordinating carboxylate oxygen atoms of EDTA make a significant contribution to overall relaxation rates. After allowing for these secondary solvation…
Deformation behaviour of L10(3R) type Ni–Al martensite was observed by tensile testing, optical-and electron-microscopy and X-ray diffraction. When the specimen initially consisting of four pairs of internally twinned L10 variants is pulled along a 〈001〉β1 axis of the mother phase, it becomes a single crystal of L10 m…
The microscopic process of void formation and propagation has been investigated in hydrogen embrittlement of iron. Specimens of pure iron in bamboo structure as well as polycrystalline specimens were tested in tension under cathodic hydrogen charging in 3%NaCl aq. at a current density of 100 A/m2. Origins of fractogra…
Formation of 27 R-AlN polytype ceramics and their mechanical properties were investigated in the typical composition of the AlN-SiO2. Densified 27 R-AlN polytype ceramics consisted of plate like grains without low temperature melting compounds at grain-boundaries were obtained by 2000°C presintering and subsequent 210…
Measurements of the electric permittivities and the splay and bend elastic constants of the cyano bicyclohexanes (CCH) are reported as a function of temperature. Comparison of the ratio of the bend to splay constants with that of analogous compounds containing phenyl rings shows unexpected trends, and attention is dra…
Cadmium tetrabenzoporphyrin, tetrabenzoporphyrin, and the bispyridine complex of magnesium tetrabenzoporphyrin were synthesized. As judged from the visible absorption spectra these compounds are not contaminated with porphyrin-like impurities. 100-MHz 1H Fourier-transform n.m.r. spectra of the above mentioned compound…
The calcite-CaC${\mathrm{O}}_{3}$(II) phase transition is described within the framework of the Landau criteria for continuous phase transitions. The $\stackrel{\ensuremath{\rightarrow}}{\mathrm{F}}$ point is chosen to construct the irreducible representation driving the transition. All Landau conditions are satisfied…
This paper presents the results of extensive laboratory tests and experience in industrial applications to explain the effects of iron on the corrosion resistance of titanium. In the great majority of cases where titanium is being used in corrosive environments, the effect of iron at the levels normally found in unall…
Porcine tracheal and bronchial explant cultures exposed to log-phase cultures of Bordetella, Candida, Corynebacterium, Haemophilus, Klebsiella, Mycoplasma, Pasteurella, Proteus, Saccharomyces, Staphylococcus and Streptococcus were examined for surface sequential changes by scanning electron and light microscopy. Infec…
The preparation and properties of some (methylhydroxyphenyl)tellurium(IV) halides, RnTex4-n, (where R = CH3C6H3OH, X = Cl, Br, I, and n = 1,2,3), are reported. Cryoscopic measurements, in general, are consistent with conductivity measurements and reflect the molecular nature of RTeCl3 and R2TeX2, and the ionic nature…
N,N',N"-Triethyl phosphoratriamide and ethyl,N,N'diethyl phosphoradiamidate are not able to phosphorylate cellulose even at 160°C. The increased efficacy of these reagents as flame retardants for cotton has been proposed due to the formation of intermediates containing -P=N grouping by loss of an amine molecule from t…
2,2′-Bi-(1,4,8,11-tetra-azacyclotetradecane) has been isolated as a minor product from the nickel (II)-assisted synthesis of 1,4,8,11-tetra-azacyclotetradecane (cyclam) and its structure confirmed by X-ray structural analysis of the dinuclear complex [Ni2(C20H46N8)][ClO4]4.
Abstract Nickel(II), copper(II), and cobalt(III) complexes were prepared with corroles; 2,3,7,8,12,13,17,18-octaethylcorrole (OEC), 2,3,17,18-tetramethyl-7,8,12,13-tetraethylcorrole (MEC), and 8,12-bis[2-(ethoxycarbonyl)ethyl]2,3,7,13,17,18-hexamethylcorrole (PMC). For the coordination with nickel and copper ions, the…
Les fonctions diélectriques ordinaires et extraordinaires du nitrure de bore hexagonal ont été calculées à partir de mesures multi-angle du pouvoir réflecteur pour une énergie de rayonnement de 5 eV à 30 eV. Les spectres obtenus sont discutés en termes de transitions interbandes.
The isolation of some new three- and four-co-ordinate gold(I) complexes is reported. 197Au Mössbauer data are given for two-, three-, and four-co-ordinate complexes, and the technique is shown to be well suited to the determination of co-ordination numbers. For the two- and three-co-ordinate systems the point-charge (…
Description Covers the practical application of titanium and zirconium-materials highly resistant to corrosion and with few design limitations.
Abstract Raman scattering measurements are made in the tetragonal phase of KNbO 3 . The results are in good agreement with the previous corresponding neutron data, and can be assigned to symmetry species. Comparison of these results to those available in the other phases enables to observe the effect of the phase tran…
Recent studies have established that subsurface material structures are altered in processes giving rise to wear. This is the case both for sliding contact and repetitive compound impact loading. It is not surprising that the thermal and mechanical processing due to solid contact and relative motion lead to localized…