Materials Literature
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Les evolutions microstructurales de l’alliage de titane β-Cez au cours de son forgeage β ont ete suivies par des essais de compression uniaxiale sur une large gamme de vitesse [10-3 -10 s-1 ] et de deformation [0,25,1,5]. L’examen des textures (RX), des structures, des microtextures (EBSD) ainsi que le trace de cartes…
Abstract The oxidative degradation of benzo nuclei of various higher contropolyindanes with ruthenium (VIII) oxide or ozone was studied to further explore the chemistry of partially benzoanellated centrohexaquinanes. Besides the two tribenzotri‐quinacenes 12 and 15 which were used as model substrates for oxidation wit…
We study the time-dependent orientational response of a nematic liquid crystal doped with single-domain ferromagnetic particles. A set of coupled macroscopic equations describing evolution of the director texture, magnetization distribution and concentration of the particles under the change of the external field is d…
A detailed study of electronic and thermal transport properties and linear thermal expansion of ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4+\mathrm{\ensuremath{\delta}}}$ single crystals with both high oxygen pressure oxidation and electrochemical oxidation were carried out. A series of anomalies of resistivity, thermoelect…
Abstract Mineralogical and chemical heterogeneity within three standard clay mineral samples have been identified by X-ray diffraction and chemical analysis of various size-fractions. This heterogeneity is partly attributed to accessory minerals, but mostly to structural and compositional variations in the 2:1 layer m…
The levels of soluble sugars, starch, pectin and insoluble fibre in blanched green beans, green beans and Padrón peppers were monitored during 12 months' deep-freezing. Blanching did not alter the pectin content of the beans, but reduced their soluble sugar and starch contents by 10 and 8%, respectively. Nonetheless,…
The morphology and optical properties of polymer stabilized liquid crystals formed in a more highly ordered low molecular weight liquid crystal solvent were studied. Tetrafunctional, mesogenic monomers (with and without flexible spacers) were polymerized in isotropic, nematic and smectic phases of the LC solvent (4′-o…
Abstract 11B- and 13C-solid state NMR of boron carbide with different isotope ratios, B4C(11B/10B = 80.42/19.58; natural abundance isotope) and 11B4C(11B/10B = 99.5/0.5; 11B enriched sample), has been investigated. The linewidth of the icosahedral B (6h1and 6h2) in 11B-static NMR signal in 11B4C was greater in 11B4C t…
Powder X-ray diffraction data are reported for La 0.6 Sr 0.4 Co 1− y Fe y O 3 ( y =0.1, 0.25, 0.4, 0.6, 0.8, 1.0). The powders were prepared by thermal decomposition of metal-containing complex solutions. All compositions have rhombohedral unit cells. In hexagonal setting, the cell parameters are a =5.4388 Å, c =13.23…
Abstract Ca 2 P 2 S 6 und Sr 2 P 2 S 6 wurden aus Metall und einem Gemenge von rotem Phosphor und Schwefel (Molverhältnis M:P:S = 1:1:3) in 2 Korundinnentiegeln in Quarzampullen unter Vakuum (20 d 900°C) als farblose, grobkristalline Pulver, die Einkristalle enthalten, rein dargestellt. Beide sind mit der Hochtemperat…
Abstract The thermal and light‐induced spin transitions in [Fe(bpen)(NCS) 2 ] and [Fe(bpen)(NCSe) 2 ] have been investigated by means of magnetic susceptibility and Mössbauer measurements. The HS → LS transition in [Fe(bpen)(NCS) 2 ] is detected at temperatures below 120 K ( T 1/2 [when the fraction of high‐spin speci…
IR depth profiling of propane‐stabilized calcia‐alumina fibers showed that carbon deposited on the fibers during melt‐spinning induced tetrahedral coordination of aluminum atoms near the fiber surface. It is proposed that this effect increases melt surface viscosity and stabilizes calcia‐alumina fibers. Ethers, esters…
This article points to the importance of penetrating micropores through the graft wall to minimize thrombosis and to enhance endothelialization in small diameter polymer skin coated vascular grafts. Four types of spongy polyurethane-polydimethylsiloxane vascular grafts (PUG) fabricated by a spray, phase-inversion tech…
Abstract Crystallization behavior of deproteinized natural rubber at −25°C was investigated by dilatometry in connection with the effect of long-chain fatty acid groups, esterified to the rubber chain, as well as free fatty acids and their esters. The overall crystallization rate decreased after removal of the acetone…
Close correlation between the dielectric constant and the degree of preferential (111) orientation is found for Ba(Ti 0.85 Sn 0.15 )O 3 ( BTS 15 ) solid-solution thin films deposited on a Pt/Ti/SiO 2 /Si(100) substrate by pulsed laser deposition. It is shown that substrate temperature is the principal factor which det…
By changing the chemical composition of phthalocyanine molecules, the electrical properties of the ensemble in the solid state can be influenced directly. This is shown for phthalocyaninatomanganese (PcMn) as compared with purely divalent central metals and for complexes in which the ligand system has been modified by…
Summary The aggregative effect of organic matter on soil particles is conditioned by its composition and concentration and the degree to which it is associated with metal ions and oxides in the soil. We treated suspensions of kaolin or quartz substrates at pH 5 with metal (Fe or Al; c. 3 to 23 mg g −1 of substrate) or…
The inhibitive action of tetrabutyl ammonium iodide, cetyl pyridinium bromide and cetyl trimethyl ammonium bromide towards the corrosion of mild steel in sulphuric acid has been investigated by weight loss and polarisation techniques. The percentage inhibition varies with the nature and concentration of the inhibitor,…
We study concentrated solutions of ideal A-B symmetric random copolymers in non-selective good solvents by computer simulations. When the effective net A-B interaction per thermal energy in the solution (χ eff ) is larger than 2, the scattering function has a peak at a molecular weight ( N ) independent wave vector k…
A new principal mechanism underlying real-time holographic grating recording in a thin cell filled with a nematic liquid crystal doped with a dye is proposed. In the experiment a laser light interference pattern is mapped in the form of a spatial modulation of index of refraction. This is achieved by respective modula…