Studies on Electrolytic Codeposition of Lanthanum-Cobalt in Urea Melt
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Structure and Properties of Ga2O3Based Glasses
Glass formation, structure of glass and some basic and topical properties have been reviewed for gallium oxide based systems which are free from conventional glass-forming oxides. Glass-forming tendency is unexpectedly large for Ga2O3 based systems. In binary and ternary systems, it is especially large for heavier met…
Change in Microstructure of Zn-Co-Cr-Al<SUB>2</SUB>O<SUB>3</SUB> Composite Coating by Cyclic Corrosion Test
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…
Physicochemical Properties of Suplatast Tosilate Racemate and Enantiomers
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…
Activated Slip Systems in β-Silicon Nitride during High Temperature Deformation
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…
Evaluation of Critical Cooling Rate for 30Na<sub>2</sub>O⋅10MgO⋅60SiO<sub>2</sub> Glass Based on Viscosity
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…
Two-dimensional molecular-based ferrimagnets incorporating decamethylmetallocenium cations
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…
Influence of Calcium Phosphates on the Degradation of Poly Lactic Acid for Medical Implants
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).
Effect of Tin Addition on Primary and Secondary Recrystallizations of Silicon Steel
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…
Chemical interaction between plasma-excited nitrogen and the surface of HY zeolite
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 and the synthesis of bis (ether anhydride) s from dihydroxynaphthalenes
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…
Surface Tension and Density of Molten Salts Based on Equimolar NaCl–KCl with Addition of Fluorides
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…
Dynamics of nematic ordering in porous media
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…
Microfracture Analysis of SiC Reinforced Glass Composites by Acoustic Emission
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 Applications of Clifford Algebras to Crystallography Using Mathematica
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…
Conceptos avanzados de tecnología para células solares con emisores P+ dopados con boro
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…
Optimization of Photosensitive Polyimide Process for Cost Effective Packaging
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…
Les “résines” cyanate pour des structures composites aéronautiques et spatiales
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…
ESTUDIO PALINOLÓGICO DEL MIEMBRO INFERIOR DE LA FORMACIÓN PACHACO, TERCIARIO DE LA PROVINCIA DE SAN JUAN. DESCRIPCIONES SISTEMÁTICAS.
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…
Calculations of Mechanical Material Constants and Evaluation of Potentials for a Simple Crystalline Metal by Molecular Dynamics Method.
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…