Materials Literature
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Infrared spectra of pthtalic anhydride and phthalic anhydride-18O have been measured in the solide state and in solutions in the 4000 – 100 cm−1 frequency region. Their linear dichroic infrared spectra in oriented nematic solutions in the nematic liquid cristal ZLI-1538 (4000 – 400 cm−1) have also been recorded and st…
The Flory interaction parameter χ1 of polyvinyl alcohol-water systems has been estimated from the diffusion data, the polyvinyl alcohol having been crosslinked from terephthalaldehyde. The values of χ1 are reported for the polymer volume fraction between 0·130 and 0·326. The values of χ1 for the terephthalaldehyde-cro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the stability of dimethyl disulfide-polysulfide mixtures under sour gas pressurePeter D. Clark, Edward Fitzpatrick, Clement S. C. Lau, and Christopher O. OriakhiCite this: Energy Fuels 1993, 7, 1, 155–158Publication Date (Print):January 1, 1993Publication History…
Use of pulsed laser ablation technique for deposition of diamond-like and other special coatings is discussed here at length, establishing the correlation between the process parameters and the film quality. Process parameters dealt with sufficient detail are the laser wavelength, laser pulse width and energy density,…
Abstract The dielectric constant, ε′, and dielectric loss, ε″, were determined for three solid carboxymethyl cellulose samples having different levels of substitution and different degrees of polymerization over a frequency range of 0.1 – 10 000 kHz at temperatures from 10–60°C. In contrast to the two relaxation proce…
A new class of materials, which basically are single crystal alloys of molybdenum and tungsten, with abnormally high creep strength, is proposed for use. The alloys have a unique and complex properties which permits us to use them successfully as cladding materials for high‐temperature fuel elements, thermionic conver…
Previous promoted combustion tests have demonstrated that the threshold pressure (the minimum oxygen pressure required to self-sustain combustion) of various engineering alloys is dependent on the configuration of the sample. Monel 400, when configured as a 3.2-mm (0.13-in.) -diameter rod, has a threshold pressu re 50…
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ASCOMETAL recently improved its steelmaking processes with the installation of new secondary metallurgy equipment (Ladle Furnace and RH degasser) and by the application of continuous casting to the production of bearing steels (AISI/SAE 52100). Such material, after rolling, is used by VALTI to produce seamless tubes f…
Based on the Sundman and Agren version [15] of the Hillert-Staffansson thermodynamic formalism [12] and on the regular solution hypothesis of Guttman and McLean [13], new formulas dealing with the segregation of impurities and metallic additives in multicomponent steels were deduced.
RESUMEN -Chara halina Garcia proviene de dos localidades meso?-
Apparently homogeneous transparent gels (polymer hybrid gels) were prepared from TEOS and PVA or PEG. IR spectra and DTA curves for the gels and pore characteristics of porous materials obtained by heating gels were examined. PVA incorporated into a gel seemd to be bound to the surrounding _??_Si-O-Si_??_ network more…
The cathodic processes localized to iron rich intermetallic phases on commercial aluminum alloys during corrosion in neutral chloride environments are controlled by the structural and compositional changes occurring on these phases in a locally stable alkaline environment. These phenomena are investigated by conventio…
R & D of ferritic/martensitic steels as structural materials for fusion reactor is one of the most important issues of fusion technology. The efforts to characterize microstructural evolution under irradiation in the conventional Fe–Cr–Mo steels as well as newly developed Fe–Cr–Mn or Fe–Cr–W low activation ferritic/ma…
The growth regularities of the internal bias field Eb formation have been investigated in pure triglycine sulphate crystals, as well as in crystals doped with chromium or α-alanine. All crystals were grown in the ferrophase from the seed of the pivot form oriented by its axis along the non-polar crystal axis Z. It was…
Abstract The porphyric‐insecticide‐modulating activities of 1,10‐phenanthroline and eight of its analogs were investigated. The insecticidal efficacy of these compounds was closely associated with their ability to enhance the conversion of exogenous δ‐aminolevulinic acid (ALA) to protoporphyrin IX (Proto). As observed…
A theory of diffusion in films of variable thickness is developed. Approximations for the short-time and long-time dependences of solvent concentration in the film are derived. Diffusion in thin films has been investigated by ellipsometry. The diffusion coefficients for different temperatures were calculated using asy…
The rational design of engineering structures as an optimization process is discussed, highlighting the desirability of identifying the influence of material selection on form at an early stage. Procedures for material selection developed at Cambridge University are examined, then extended to incorporate the manufactu…
Cristallisation dans Pnma avec a=7,162, b=9,566 et c=6,5029 A, Z=4; affinement jusqu'a R=0,025.
The Space Shuttle launch environment at the John F. Kennedy Space Center is extremely corrosive. Recent corrosion studies have identified Hastelloy B-2, Haynes Alloy C-230, Hastelloy C-22, Hastelloy C-276, Hastelloy G-30, and Inconel 625 as being very resistant to this launch environment. Since several corrosion relat…