Materials Literature
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La résonance en intensité Raman a été étudiée pour plusieurs phonons du spectre de SbSI dans les phases ferro-électrique et para-électrique. Les intensités ont été corrigées par des mesures directes du coefficient d'absorption et calibrées par un cristal de référence. L'allure de la courbe de résonance est en très bon…
K α And KβX-ray emission spectra of V (metal), [V(pd)3](pd = pentane-2,4-dionate), VF3, VO2, V2O5, [VO][SO4], [NH4][VO3], and [NH4][V3O8] are reported. It is argued that peaks of higher energy than Kβ1,3 are due to transitions involving molecular orbitals with Vp character rather than V 3d. The relative intensities an…
In the 60 years since its discovery, X-ray diffraction has become established as one of the most important techniques in the study of crystalline materials for fundamental and applied research and for routine analyses. Perusal of the literature in scientific fields such as chemistry, metallurgy, mineralogy, and pharma…
The photo-oxide of 1,3-diphenylisobenzofuran, obtained by dye-sensitised photo-oxidation in ether, has several isomers including an arene oxide and an oxepin, formed in a new peroxide rearrangement.
Optimum fiber orientations in symmetrically laminated cylindrical shells under combined loadings are investigated. The theory of maximum work is used as the strength criterion. A modified golden section method is employed for the optimization. The glass-epoxy composite is taken for numerical examples.
La structure cristalline de la zéolite barrérite [(Ca₁,₇ Mg₀,₃ Na₁₀,₉ K₂,₁) (Al₁₆,₄Si₅₅,₄) O₁₄₄] • 51,6H₂O a été étudiée au moyen des rayons X : le groupe spatial est Amma avec a = 13,643 (2), b = 18,200 (3), c = 17,842 (3) Å. La charpente de la barrérite est identique à celles de la stilbite et de la stellérite. L'ab…
for the transformation energy. Electrical resistivity is found to decrease by 17 percent during the transformation. Estimated inaccuracies of the measured properties are: 10 K for the transformation temperature, 5 percent for the transformation energy, and 2 percent for the electrical resistivity.
Purely instrumental contributions to the angular dependence of XPS peak intensities are considered theoretically and experimentally, and it is found that peak-ratio angular distributions should be free of all instrumental effects, and thus amenable to more direct analysis in terms of specimen-related properties. This…
Invar alloys are widely used as materials for precision instruments. The practical Invar alloys are all ferromagnetic, and the ferromagnetism of these alloys often limits the scope of their application.In recent years, therefore, considerable attention has been directed to the research and development of nonferromagne…
The major components of gas turbines and their materials requirements are outlined. The properties, advantages, and limitations of materials which have been and are being used in gas turbines are then described in the following groups: aluminium alloys, magnesium alloys, titanium and its alloys, steels, and finally ni…
The crystal structure and internal defects of the banded martensite in a quenched Cu-24.5 wt%Sn alloy have already been investigated by Nishiyama et al. However, since their results are rather unexpected in some respects, the crystal structure and the morphology were reexamined by means of electron microscopy and sele…
Effects of alloying elements on the pitting corrosion resistance of 17Cr-16Ni steels with and without 4% Mo were evaluated by the corrosion rate in 10% FeCl3·6H2O and 4% NaCl added with hydrogen peroxide and by the polarization measurement in 0.1N NaCl+0.1-0.25N Na2SO4 at 40°C. The elements, the content of which was v…
Supporting evidence for complex ion formation in MgCl 2 alkali chloride melts was sought from a single crystal X-ray analysis of the title compounds. Crystals of K 2 MgCl 4 are tetragonal, a = 4.94, c = 15.58 Å, Z = 2, space group I 4/mmm. The compound is isostructural with K 2 NiF 4 , and was determined with MoK α di…
In an attempt to reach a quantitative understanding of the physical mechanism of multi-stage flash evaporation, an experimental study was made of flash evaporation phenomena in a 1.0 m long and 10 cm wide flash chamber with and without baffle plates.The experiments covered the range of liquid flow rates between 6 and…
During diffusional creep, the grains of a polycrystal move relative to each other to maintain specimen coherency. This movement is analysed and it is shown that grain-boundary sliding and diffusion creep do not generally make separate contributions to the total creep strain.
The effect of thermal annealing (up to 2000 °C) on the structure : nd physical properties of irradiated graphite has been investigated. The irradiation was carried out in the reactor at 100–900 °C up to : dose rate of about 15·1020n/cm2(En > 0.18 MeV). Two types of the material were tested: pyrolytic and reactor graph…
Differential thermal analysis shows that in soils organic matter and carbonates react in very different temperature ranges. An automatic CHN Analyzer was therefore used to determine the organic and inorganic carbon content of soils. At 500°C complete oxidation of soil organic matter occurs without appreciable decompos…
Abstract Grafting of acrylic acid onto methylcellulose backbone was studied using potassium persulfate as initiator. Different variables affecting the extent of grafting were studied. The copolymers with more than 20% grafting became insoluble in water. The solubility of the graft copolymer in different solvents and m…
In common with other aquatic angiosperms, Nelumbo nucifera Gaertn. has a relatively strongly developed phloem tissue. The vascular system consists of discrete collateral bundles in which no cambium develops and the phloem and xylem are separated by a narrow layer of parenchyma cells. The phloem consists of sieve eleme…
X-Ray structural data for the bis-azobenzene-nickel(II) complexes (I) and (II) show that the donor atom X influences the size of the metallocycle and the bonding arrangement around nickel; in (I)(X = S) the metallocycle is five-membered, whereas in (II)(X = O) it is six-membered.