Materials Literature
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Rh nanoparticles (mean size 10 and 15 nm), prepared by epitaxial growth on NaCl surfaces, were covered with layers of crystalline vanadium oxide (mean thickness 1.5 and 25 nm) by reactive deposition in 10(-2) mbar O2. The 1.5 nm film was further stabilized with a coating layer of 25 nm amorphous alumina. The so-obtain…
This paper presents an experimental method and theoretical analysis to study the dielectric effect in Mn-Zn ferrite cores. Experimental results show that dielectric effect becomes very pronounced at high frequency. This is caused by the high permittivity of the ferrite core. Theoretical analysis is then introduced to…
High voltage composite insulators are being accepted increasingly for use in outdoor installations. This research work aims at assessing the experimental performance of the two types of polymeric composite insulators being prepared for use in high voltage overhead transmission and distribution networks. Experimental i…
Lead telluride is traditional thermoelectric material at middle temperature and widely applied for electricity generation. They have been attracting many scientists to research on. The paper reports an N-type PbTe materials with high thermoelectric performances based on the traditional halogen-doping mechanism with ad…
In order to develop new redox systems which undergo reversible structural changes by electron transfer, bis(1,3-benzodithiolium)-type dications (5 21) containing a biaryl unit have been synthesized by hydride abstraction of the corresponding bis(1,3-benzodithiol-2-yl)biaryis (8). Reduction of 5 2, with zinc gave the c…
Evidence has been presented that the mixed anhydrous hydrogen fluoride (HF) and methanol (CH3OH) gas, which is used for dry etching the sacrificial layer of silicon dioxide film, deteriorates silicon nitride film (SiN). From the results of chemical composition analyses, the alteration product was identified to be ammo…
The high surface area of porous silicon (PSi) makes it attractive for use in chemical and biological sensors. Selectivity, however, will require tailoring its interfacial characteristics with organic molecules. This paper describes in situ functionalizing of PSi during its electrochemical formation with 1-heptyne and…
Comparative spectroscopic studies of crystalline and amorphous samples of Eu 2 (MoO 4 ) 3 were carried out. Amorphous samples were obtained through exposure of the β' crystal phase to a high pressure of ∼9 GPa. It was established that the transition to the amorphous state is accompanied by substantial changes both in…
In recent years, shape memory alloys (SMAs) have become widely used in engineering applications due to their simplicity in use and high power density. These smart materials are characterized by their unique temperature dependent phase transformations. An accurate heat transfer model is of the utmost importance for mod…
The sensitivity and stability are mainly factors to hold back the practical applications of Polypyrrole coated fabrics. In this paper, a flexible fabric strain sensor with high sensitivity, good stability and large deformation is reported. It is fabricated by depositing a nano-layer (200nm to 300nm) of polypyrrole on…
In order to evaluate the strain rate dependence of the dynamic flow stress of 6061-T6 aluminum alloy, strain rate reduction tests are conducted in the strain rate range from about 2×104 to 4×104s−1, which is the strain rate range before reduction, and the reduction in strain rate is 58.6%. To eliminate an effect of el…
Significant phase refinement and dispersion were achieved in a cast Mg-8 mass%Li alloy through processing by equal-channel angular pressing (ECAP) using a die having an internal channel angle of 110° and a pressing temperature of 473 K. Following extrusion and subsequent ECAP through 2 passes, the alloy exhibited supe…
A 1D thermo-fluid dynamic computational model has been developed to simulate the unsteady reacting flows inside the SCR (Selective Catalytic Reduction) after-treatment systems of diesel engines. The standard SCR reaction, extended with a detailed NH3 adsorption and desorption mechanisms, and two reactions of urea deco…
For the purpose of growing diopside (CaMgSi2O6) single crystals with high quality and high homogeneity from a melt, a Czochralski method has been applied. Using this method, a colorless-transparent diopside single crystal with a composition close to stoichiometric and approximately 15 mm in diameter by 70 mm in length…
使用済みハロカーボンの無害化処理のため，TiO2および殺菌灯を用いて，光触媒分解反応実験を行った．化学物質の置換基の違いによる分解速度の解析のため，対象とする化学物質は，構造が同じで置換基が異なるHCFC-22，四塩化炭素，メタンを用いた．それぞれの物質の分解反応速度解析をおこなった．主な結果として，分解率はHCFC-22が最も大きく，次いでメタン，CCl4の順であった．光触媒反応の反応次数は本実験条件範囲では一次であった．総括的反応速度定数から求めた活性化エネルギーはそれぞれHCFC-22が13.7 kJ·mol−1，CCl4が66.1 kJ·mol−1，メタンが16.6 kJ·mol−1であった．
The magnetic fields in nonlinear anisotropic magnetic materials were analyzed by using the Finite Element Method (FEM). The measured data was directly used in the computation without a complicateded smoothing. The resultant asymmetric linear equations were solved by using the ILUBiCGStab method without symmetrization…
The effects of alumina hydrates, namely boehmite gel and bayerite, formed by hydration of hydraulic alumina (HA) on the green strength and microstructure of porous alumina ceramics were studied. A boehmite gel (3-D) network was formed at an early stage of the hydration of HA in HA slurry. The HA slurry was hardened by…
We report the fabrication and the characterization of photo-crosslinked porous hydrogel membrane via the electrospinning. Poly (ethylene glycol) (PEG) nanofibers were extruded and deposited on poly(ethylene glycol) diacrylate (PEG-DA) macromer, and then they were photo-crosslinked. The morphologies of these photo-cros…
Ceramic Matrix Composite (CMC) combustor liners, due to their high temperature capability, enable the elimination of film cooling present in current metallic liners without increasing the pressure drop in the combustor section of a gas turbine engine. The absence of film cooling and the higher temperature capability o…
Hydrogen adsorption on Pd/Ce(0.8)Zr(0.2)O(2) was studied by temperature-programmed reduction, volumetric measurements and IR spectroscopy. Hydrogen uptake and reduction rate at 353 K are strongly dependent on the hydrogen pressure. At relatively high hydrogen partial pressure, reduction involves PdO, the surface and a…