Materials Literature
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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…
Chitin, chitosan and quaternary chitosan films were prepared, and the mechanical properties and the antibacterial activities of chitosan and quaternary chitosan films were evaluated. The tensile strength of chitin films was 30-40% lower than that of chitosan films, but the crystallinity of the former was much higher t…
A hypertonic saline containing propylene glycol facilitates calcium (Ca(2+)) influx through voltage-dependent Ca(2+) channels. The present study performed experiments to elucidate the mechanism by which Na(+)-K(+)-2Cl(-) cotransporters participate in the rise in the intracellular calcium concentration ([Ca(2+)]i) unde…
Partial discharge characteristics in air under low vacuum region were studied to develop vacuum leakage detector system. The pressures were set at 1.3 Pa to 2.6 kPa in order to simulate the leakage of vacuum interrupter. The measurement of discharge occurring inside the vacuum interrupter was performed with current tr…
Las técnicas de indentación poseen una gran versatilidad que permite evaluar propiedades mecánicas en volúmenes inferiores a 0.001 m3, hasta volúmenes del orden de los m3, útil tanto en materiales compuestos como en volumen. Este artículo hace una revisión general de los fundamentos de éstas técnicas. También se muest…
A series of DOP tests with lateral confinement have been carried out and a linear relation between the residual penetration in RHA and the alumina thickness has been obtained. The rod configuration and the initial transient impact are the two factors that cause the gradual decrease of the differential efficiency facto…
A series of plate impact experiments was performed, using a single‐stage gas gun, on die‐pressed, high density (92 % theoretical maximum) samples of ultrafine hexanitrostilbene (HNS). This enabled investigation of the inert shock response and subsequent detonation of the material. Shock magnitudes up to ca. 6 GPa were…
This study has two central concerns: the state of human health in forests, and the causal links between forests and human health. Within this framework, we consider four issues related to tropical forests and human health. First, we discuss forest foods, emphasizing the forest as a food-producing habitat, human depend…
Electron beam irradiation has been reported to be effective for polymer surface modification and on strengthening of inorganic glass. In the present research effects of electron beam irradiation on impact value of glass fiber reinforced polymer (GFRP) were studied. The electron beam irradiation enhanced Charpy impact…
Investigations of photophysical processes in amorphous chalcogenide layers were extended during the last two decades towards the nanostructures. Namely the nano-layered films were in the focus of development of new photosensitive, optical recording media. A short review of the progress made in the development of the t…
Bismuth ion in four layered strontium bismuth titanate (SBT), a compound of Aurivillius family, is partially replaced with La 3 + in the place of Bi 3 + to synthesize SrBi ( 4 - x ) La x Ti 4 O 1 5 , with x = 0.25, 0.50, 0.75. The ceramic powders were prepared using chemical route. The temperature dependence of the di…
Based on the investigation of distribution and many seasonal water samples in the surface sediment of 45 lakes in the middle and lower reaches regions of Yangtze River, the ecological characters of total phosphorus of indexes of 57 common diatom species were studied. The ecological best values and tolerance range of t…
Organic peroxides (PO) are used as crosslinking (vulcanizing) agents. Free radicals generated from PO can abstract hydrogens from saturated rubbers such as polyethylene, ethylene-propylene-diene terpolymer and highly hydrogenated acrylonitrile-butadiene rubber to form intermolecular C-C bonds. The crosslinking using P…