Materials Literature
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The microstructure and chemical state of Zn-Co-Cr-Al2O3 composite coating before and after the cyclic corrosion test (CCT) were investigated by electron microscope, X-ray photoelectron spectrometer, and electron probe micro analyzer. The coating layer consisted of a Zn matrix containing super-saturated Co and disperse…
The physicochemical properties of the enantiomer and racemates of suplatast tosilate (ST) were investigated by means of infrared spectroscopy, solid-state 13C CP/MAS NMR spectroscopy, thermal analysis, and X-ray diffraction analysis, and by measuring the solubility and hygroscopy. The infrared and NMR spectra and X-ra…
In order to clarify the activated slip systems of β-silicon nitride (Si3N4) during high temperature deformation, we have studied the dislocation structures in hot-pressed β-Si3N4 deformed at temperatures from 1820 to 2020 K with strain rates from 9×10−6 to 2×10−4 s−1.Analysis of the dislocations by transmission electr…
The critical cooling rate for 30Na2O⋅10MgO⋅60SiO2 glass, which exhibits low Rayleigh scattering, was evaluated based on viscosity. To this end, the viscosity and thermal expansion coefficient of this glass were measured using a thermomechanical analyzer. The beam bending and parallel plate methods were effective in me…
Four new molecular-based magnets have been synthesized, and their magnetic properties have been investigated in detail. Their formulae are [M′(C5Me5)2]2M2[Cu(opba)]3·(DMSO)x(H2O)y with M′= Fe, M = Mn, x = 5, y = 4 (1), M′= Fe, M = Co, x = 6, y = 4 (2), M′= Co, M = Mn, x = 5.5, y = 4 (3) and M′= Co, M = Co, x = 5.5, y…
Article Influence of Calcium Phosphates on the Degradation of Poly Lactic Acid for Medical Implants was published on January 1, 1996 in the journal Biomedical Engineering / Biomedizinische Technik (volume 41, issue s1).
The effect of the tin addition on the primary recrystallization of Fe-3%Si containing no inhibitor was investigated. The tin addition increased the product of ND pole densities {110} and {111}. This effect is considered to be favorable for the secondary recrystallization of the silicon steel with such handicaps as hig…
The chemical interaction between plasma-excited nitrogen and the HY (decationated Y-type zeolite) surface has been studied by IR spectroscopy, XPS and temperature-programmed desorption (TPD). When the plasma-excited nitrogen was exposed to the HY sample at room temperature, the decrease in the intensities of the OH ba…
Nitrodisplacement reactions between all ten dihydroxynaphthalenes and 4-nitrophthalodinitrile have been studied. Apart from 1,8-dihydroxynaphthalene, all dihydroxynaphthalenes undergo nitrodisplacement but only 1,5-, 2,3-, 2,6- and 2,7-dihydroxynaphthalenes give high yields of pure bis(ether dinitrile). The bisfether…
Molten salts based on equimolar (NaCl–KCl) with small addition of fluorides are usually used in remelting secondary aluminum alloy scrap such as Used Beverage Cans. In this work, the surface tension of equimolar NaCl–KCl with addition of NaF, LiF, KF, and Na3AlF6 have been measured by the pin detachment method. Additi…
A microscopic lattice model for nematic liquid crystals in the presence of random fields is studied by Monte Carlo simulations. The order parameter autocorrelation function shows a standard dynamical scaling for weak random fields, and an activated dynamical scaling for strong random fields. These results are consiste…
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…