Materials Literature
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We address the problem of the scattering of a plane, TM-polarized electromagnetic wave by a two-dimensional rectangularly corrugated surface. The height of the corrugation is measured by a characteristic length D and its period by /spl Lambda/. We take the ordering of these scales to be D/spl sim//spl Lambda//spl sim/…
The synthesis and characterization of various poly(pyrrole)s derived from (1H-pyrrol-3-yl)acetic acid are described. The stability and the conductivity of polymers from ester derivatives of (1H-pyrrol-3-yl)acetic acid with linear or branched alkyl chains, ether or thioether functions and polyfluorinated chains are eva…
Abstract Three co‐operative phenomena that are supposed to originate in the orientation‐dependent interactions among polymer segments are discussed and attempted to be interpreted in terms of a common set of polymer models.
Polypropylene sheets are treated with oxygen plasma for the interfacial control of GF/PP composites. The interfacial strength between glass fabric and PP resin is estimated by the T-peel test method. The evaluation of T-peel test data is done by both the T-peel strength method and the T-peel amplitude method. The T-pe…
The molecular dynamics simulation of electromigration has been made for nano-sized metal lines. By solving Laplace equations for the electric field using the relaxation method the current direction and the local current density were determined. In this model, a two-dimensional Lennard-Jones single crystal structure in…
The surface chemical composition of top fermenting brewing yeast Saccharomyces cerevisiae MUCL 38475 was determined by XPS. The sample was prepared by washing the harvested cells in distilled water, freezing the suspension in liquid nitrogen, freeze drying, filling a trough with the powder and pressing gently. The yea…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTOrientation-Dependent Interactions in Polymer Systems. 6. Effect of Segmental Orientation on Polymer MiscibilityTakeshi Fukuda, Koji Fujimoto, Yoshinobu Tsujii, and Takeaki MiyamotoView Author Information Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, JapanC…
Competitive binding between Tl + and alkaline-earth metal cations (Mg 2+, Ca 2+, and Ba 2+ ) onto copolymers of sodium acrylate and acrylamide with varying charge densities (0.94 < ξ < 2.5) was investigated by fluorescence and absorption spectroscopy with use of phenanthrene (Phen) and a pH-sensitive merocyanine dye (…
The magnetic properties of 0.15-3%Si non-oriented electrical steel sheets were measured at temperatures ranging from 4 K to 200°C. Except for the 3%Si sheet, all the sheets were more easily magnetized at higher temperatures. The hysteresis losses increased at lower temperatures, but the changes were less than those du…
To understand the role played by the complex microstructural arrangements in a giant magnetostrictive material, we were led to develop a micromagnetic theory where equilibria are described by the oscillatory statistics of approximating or minimizing sequences of a variational principle. The issues we encountered and t…
Graphite films with very high crystal perfection were prepared from carbonized aromatic polyimide films by successive heat treatments at 3100°C for 40 min and then 3200°C for 23 min without mechanical stress. The starting materials were a commercially available Kapton with 25 μm in thickness and laboratory prepared hi…
Substituted dihydroxystilbenes 2 are suitable starting materials for the synthesis of photochromic systems derived from 3/4. Attempts to couple the naphthones 8a-8e by the McMurry reaction with TiCl3/LiAlH4 yielded mainly reduction products such as 8f, g or 9. However, the furofuran 3b was isolated when using the zinc…
Friction and wear properties of C/C and ceramic particle dispersed C/C composites sliding against sialon ceramics were investigated in a zinc plating bath.The results are summarized as follows:(1) SiC particle dispersed C/C has the highest friction coefficient and the lowest wear resistance. BN particle dispersed C/C…
Plasma arc technology is a high temperature process that completely oxidizes organic waste fractions: inorganic hazardous and radionuculide waste fractions are oxidized and encapsulated in a highly durable slag. The robust nature of the technology lends itself to application of diverse mixed and hazardous wastestreams…
Abstract Thermal decomposition of freeze‐dried complex oxalate precursors allows the synthesis of crystalline phases in the FeNbO 4 TiO 2 system at relatively low temperature. This system shows not only a rutiletype, but also a wolframite‐type solid solution (ss), which exists at lower temperatures. The temperature o…
A study is made of the thermal expansion coefficient and the glass transition temperature in atactic polymethylmethacrylate (PMMA) irradiated first with γ-ray doses between 50 and 200 kGy, The change of the molecular weight due to the damage of the polymer chain produced by the γ-irradiation was also measured. Besides…
The modified null field approach to elastic P- and SV-wave scattering (in plane strain) from a partially debonded fiber has been developed. The debonded region on the fiber surface is subjected to traction free boundary conditions, whereas the fiber is assumed to be in welded contact with the host medium elsewhere. Ad…
Diffusion coefficients of hydrogen and deuterium in titanium, titanium–aluminium alloy Ti88Al12 and intermetallic Ti3Al have been measured in the temperature range 873–1298 K. The activation energy for diffusion has been found to be almost the same for hydrogen and deuterium and to increase, as the aluminium content i…
Abstract Polypropylene (PP) particles were chemically coated with polypyrrole (PPy). The content of polypyrrole varied from 0.8 to 7.6 wt.‐%. Electrical conductivity of compression moulded samples depends on the concentration of polypyrrole and reached values from 4×10 −10 to 5×10 −3 S/cm, which is about 7 orders of m…
The results are presented of a study of pretreatment methods as possible controls on the buildup (plateout) of cobalt and cesium activity on the inside surfaces of mild and stainless steel piping used to carry radioactive liquors. Coupon specimens of mild steel and Type 304L and 18/13/1 stainless steel piping are trea…