Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of model urethane reactions and cure in polyurethanes by UV absorption and fluorescence spectroscopyXiao Yan Huang, Weiching Yu, and Chong Sook Paik SungCite this: Macromolecules 1990, 23, 2, 390–398Publication Date (Print):January 1, 1990Publication History Publishe…
2014 Le bicristal de silicium contenant le joint de flexion 03A3=9 (122) [011] est utilis comme matriau modle pour tudier, l'aide de la microscopie lectronique haute rsolution, les mca- nismes de dformation l'chelle atomique. Les mystres des tout premiers stades de dformation du joint ont t lucids. On a montr que les…
Dynamic differential thermal analysis (DTA) data on a series of polyethylene (PE) samples containing known contents of two primary (phenol and amine) and two secondary (thioester and phosphite) antioxidants are presented. It is shown that the dynamic method, in which the temperature of the start of an exothermal oxida…
Partial structure factors of GeO2 glass are estimated from the anomalous X-ray scattering data at the Ge K absorption edge and the conventional neutron diffraction results, and calculations of the partial radial distribution functions are presented for Ge–O and O–O and Ge–Ge pairs.
Patterns of periderm ontogeny were studied in vigorously growing branches and leaders of Calotropis procera (Ait.) Ait. f., Carissa grandiflora A. DC., Ficus elastica Roxb., Ficus religiosa L. and Melia azedarach L. In all of these five woody species the periderm develops in clear polar patterns, with inhibitory zones…
Phase retardance of a liquid-crystal-based, electrically tunable wave plate as a function of voltage and incident light intensity at 10.6 microm is measured using the Stokes-MacCullaugh ellipsometry technique. At intensities of up to 900 W/cm(2), device performance is found to be driven by thermal effects and not opti…
Experimental studies were carried out on a direct production of Fe–RE (RE=Nd, Sm) and Co–RE alloys from the rare earth oxides by a reduction-diffusion (R-D) method. In the R-D process, a rare earth oxide is reduced by calcium between 1173 and 1473 K in the presence of iron or cobalt particles and the reduced rare eart…
Novel colourless side-chain methacrylate copolymers exhibiting relatively narrow charge-transfer bands at 335 nm and second-order optical nonlinearities up to d33= 4.3 pm V–1(at 1064 nm) have been synthesized and characterized.
This work demonstrates the usefulness of flow microcalorimetry for surface characterization of metal foils (aluminum) and polymer [poly (ethylene-co-acrylic acid)] fibers. It shows that the polymer to aluminum adhesion is dominated by Lewis acid/Lewis base type interactions. These interactions are predictable from the…
Humidity-induced movements were studied on biaxially stretched samples of sized and gessoed fabric and on films of size and gesso without fabric. In-plane strains were detected through observation of crack patterns formed in a brittle coating applied on the samples. Different patterns recorded during drying and humidi…
Intercalation of phosphorus-doped SnSe2 with bis(cyclopentadienyl) cobalt {Co(η5-C5H5)2} produces superconducting SnSe2{Co(η5-C5H5)2}0.33 with a critical temperature of 6 K; magnetisation measurements show a hysteresis loop with a maximum at 40 G, indicating type II superconducting behaviour; the lower critical field…
In order to develop low activation high chromium ferritic steels for fusion reactors, the effects of 0.05-0.16 wt% Ta and 0.05 wt% Nb alloyings, and heat treatments on elevated temperature strength, toughness and microstructures of 0.1C-9Cr-2W-0.2V-0.04N steels were investigated. Normalizing and tempering conditions w…
Abstract Supersaturation is the driving force for crystallization from solution. For design and operation of crystallization processes, it is necessary to apply a set of criteria for the determination of appropriate or even optimum supersaturation. In this paper we present and discuss the results of our experimental a…
The plasma-arc melting process has reacently been noted for the refining and degassing of several metals, by applying hydrogen to the plasma-generating gas.In this work, deoxidation and decarburization of crude tantalum, prepared by carbon-reduction smelting of Ta2O5 with Ar plasma-arc heating, has been investigated b…
Tests of austenitic stainless steel clad U-xP-10Zr fuel (x=o, 8, 19 wt. %) to peak burnups as high as 18.4 at. % have been completed in the EBR-II. Fuel swelling and fractional fission gas release are slowly increasing functions of burnup beyond 2 at. % burnup. Increasing plutonium content in the fuel reduces swelling…
The laser conditioning of dielectric thin film HR coatings has been studied as a practical method for the improvement of the damage thresholds of large area (1.1 m dia.) high power 1064 nm laser mirrors on the LLNL 120 kJ, 100 TW Nova laser system. Both HfO2/SiO2 and ZrO2/SiO2HR coatings were conditioned by rastering…
Breeding experiments revealed that the white coloration of shell (prismatic layer) of the Japanese pearl oyster is inherited under the control of a recessive gene. Three matings were made: in two of them white female mated to white male in the other white female with brown (most common type) male. All the offsprings f…
Aqueous molybdenum(VI) has been studied between pH 6 and 1.2 by 17O and 95Mo n.m.r. spectroscopy. Heptamolybdate, [Mo7O24]6–, its monoprotonated form, and β-octamolybdate, [Mo8O26]4, are clearly identified, and evidence has also been found for an intermediate species [H3Mo8O28]5–. The protonation site of heptamolybdat…
Anisotropic effect of magnetohydrodynamics on solidification of Pb-10%Sn alloy has been studied in a magnetic field generated by a superconducting magnet. Experimental castings have been conducted with a mold designed to solidify the alloy unidirectionally. It has been observed that equiaxed structure changes to colum…
A simple analysis of the local linear density of a yarn yields an equation of its overall variance, which has three components: variance of the number of fibers per cross section, variance of the mean local fiber fineness, and that of the mean parameter of fiber inclination relative to yam axis. Further mathematical a…