Materials Literature
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Electronic structure of B-doped diamond is studied based on first-principles calculations with supercell models for substitutional and interstitial doping at 1.5–3.1 at.% B concentrations. Substitutional doping induces holes around the valence-band maximum in a rigid-band fashion. The nearest neighbor C site to B show…
Colloidal semiconductor nanocrystals from CdSe show photoluminescence quenching via titration with porphyrin derivatives. This quenching is an indication of the formation of nanoassemblies via surface attachment of pyridyl linker groups. As a consequence of the complex formation, dynamic and/or static interactions bet…
We examined the claw type teeth motor as one application of the soft magnetic composite to a motor core. In order to understand quantitatively the characteristics of the claw type teeth motor, we used the 3-dimensional electromagnetic field analysis to predict its characteristics in advance and manufactured a trial mo…
Diffraction studies of nonstoichiometric compounds have revealed various diffusion scattering effects caused by formation of a short-range order related to substitutions of atoms and vacancies (or different-sort atoms) or to atomic displacements. For nonstoichiometric compounds, we consider experimental results on sho…
Submicron scale vanadia/silica hybrid nanofiber mats have been produced by electrospinning silica sol‐gel precursor containing vanadium oxytriisopropoxide (VOTIP), followed by calcinations at high temperature. The properties of the resulting inorganic hybrid nanofiber mats are compared to those of electrospun pure sil…
The sinterability of three kinds of commercially available nano-sized SiC powders and a treated nano-sized SiC powder was investigated using Al2O3-Y2O3-CaO as a sintering additive. The commercially available, as-received nano-sized SiC powders were difficult to sinter to a relative density of >95% by conventional hot…
The ICARE/CATHARE code system has been developed by the French “Institut de Radioprotection et de Suˆrete´ Nucle´aire” (IRSN) in the last decade for the detailed evaluation of Severe Accident (SA) consequences in a primary system. It is composed of the coupling of the core degradation IRSN code ICARE2 and of the therm…
An electrochemical method of preparing a porous nickel electrode by NiZn alloy formation and subsequent dealloying in zinc chloride-alkali chloride ( 60 - 40 mol % ) melts at 350 – 450 ° C was studied. X-ray diffraction measurements at different stages of dealloying suggested that two step transformation from γ- to β…
The studies on environment degradation of poly(e-caprolactone) (PCL) in various natural conditions namely in the compost with activated sludge and in seawater were done. Poly(e-caprolactone) degradation has been also carried out in laboratory conditions in seawater with sodium azide addition (NaN3, 0.195 g/L). NaN3 el…
A nuclear reactor system could provide power to support long term human exploration of the moon. Such a system would require shielding to protect astronauts from its emitted radiations. Shielding studies have been performed for a Gas Cooled Reactor system because it is considered to be the most suitable nuclear reacto…
Prior research from this laboratory demonstrated that chemically modified collagen byproducts could be used effectively as fillers during leather processing. The gelatins were reacted with glutaraldehyde and, after application to veiny leather, these highly polymerized gelatins did fill and more importantly were bound…
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L’objectif de cette contribution est d’expliciter les procédés d’interprétation des données qualitatives dans un cadre théorique spécifique, celui des microgenèses situées. Il s’agit de présenter brièvement ce cadre, puis de mettre en lumière ses exigences méthodologiques et ses procédés d’analyse. Ce faisant, la cont…
This chapter describes two enzyme immobilization methods based on the biomolecule encapsulation into polymer matrices: the sol-gel technology and the entrapment into the polymer poly(vinyl alcohol) with styrylpyridinium groups (PVA-SbQ). The sol-gel technology is based on the formation of silica matrices of metal or s…
Thin films of CdS (30-200 nm) and CdSe (10-100 nm) are prepared by physical vapour deposition using one-step (for CdS and CdSe) or step-by-step (for CdSe only) approach. Atomic force microscopy measurements reveal a grain size decrease with decreasing layer thickness. The effect is strongest in the step-by-step CdSe l…
In this study, singular fields at the ends of fibers are discussed by the use of models of rectangular and cylindrical inclusions in a semi-infinite body under pull-out force. The body force method is used to formulate those problems as a system of singular integral equations where the unknown functions are densities…
films were prepared on conductive substrates from a magnesium nitrate aqueous solution containing zinc sulfite kept at by electrochemical deposition techniques. In particular, film with the wide bandgap energy of was grown on conductive substrate at cathodic potential of .
Disorder of intercalated surfactant molecules in clay minerals causes gradual swelling, rather than commonly assumed swelling in discrete steps.
The design of antenna radome utilizing the left-handed materials at a frequency close to 5 GHz for the first time for enhancing the antenna gain is presented. We make use of the multi-layered structure composed of two materials with left-handed materials and air. The two materials have an average index of refraction a…
The addition of a solution of excess K(SCN) to an aqueous solution containing Cu(NO3)2.6H2O and 1,3-bis(amino)-2-propanol (bdapH) yields a novel 2D mixed Cu(I)-Cu(II) complex; X-ray diffraction and magnetic studies are reported herein.