Materials Literature
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SiC particulate reinforced glass matrix composites were fabricated by hot pressing. The volume fraction of SiC was changed from 0% to 30%. The elastic modulus of the fabricated composites was consistent with a law of mixture based on the micromechanics. In order to evaluate the mechanical properties of the materials w…
The discovery of materials such as incommensurate structures and quasicrystals makes necessary to extend crystallography to more than three dimensions. In this work, we explore the use of Clifford algebras to describe n -dimensional lattices. This point of view allows to phrase the geometrical crystallography in a con…
El objetivo de la tesis es aplicar conceptos avanzados de tecnologia en la fabricacion de celulas solares con emisores p+ dopados con boro. Los trabajos han progresado en dos lineas: el diseno y caracterizacion de un proceso basado en doble difusion de b/p asi como de las celulas producidas y la aplicacion de tecnicas…
Recent developments in the use of photosensitive polyimide (PSPI) and in the associated exposure equipment have expanded the applications of photosensitive polyimide in the semiconductor industry. The thermal and dielectric characteristics of photosensitive polyimide are compatible with the requirements of semiconduct…
Cet article présente une synthèse des travaux d’un groupe de laboratoires qui, sous l’égide de la DRET, a pendant cinq ans conduit des études visant à éclaircir différents aspects de la physico-chimie de résines thermodurcissables à base d’arylcyanates. Les résultats obtenus sur les structures de réseaux ont été corré…
The systematic results obtained from the palynological study of the basal member of Pachaco Formation, Paleogene, Precordillera Central, San Juan Province, is presented in this contribution. The samples were taken from four levels of two outcropping sections of this formation (the northem and the southem one). Twenty…
The purpose of the present study is to develop a procedure for calculating mechanical Material constants of simple crystalline metal by the molecular dynamic method (MD). Suitable parameters for total number of particles, incremental time and numbers in numerical integration of motion equations were investigated in MD…
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…