نتایج جستجو برای: al2o3 sio2
تعداد نتایج: 23859 فیلتر نتایج به سال:
In a new approach, we have fabricated 6:1 aspect ratio magnetic nanocolumns, 60–250 nm in diameter, embedded in a hard aluminum-oxide/gallium-arsenide (Al2O3 /GaAs) substrate. The fabrication technique uses the highly selective etching properties of GaAs and AlAs, and highly efficient masking properties of Al2O3 to create small diameter, high aspect ratio holes. Nickel ~Ni! is subsequently elec...
Apollo 14 regolith breccia 14076, long known to be uniquely endowed with high-alumina, silica-poor (HASP) material of evaporation-residue origin, has been found to contain a diverse suite of complementary condensates, dubbed GASP (gas-associated spheroidal precipitates). GASP occurs in two forms: as glassy or extremely fine grained quenched-melt spheroids, mostly less than 5 lm across; and as q...
Ni-based catalysts as replacement for noble metal catalysts are of particular interest in the catalytic conversion of biomass due to their cheap and satisfactory catalytic activity. The Ni/SiO2 catalyst has been studied for the hydrogenolysis of glycerol, and doping with phosphorus (P) found to improve the catalytic performance significantly because of the formation of Ni2P alloys. However, in ...
Aim: To investigate the effect of different types nanoparticles on compressive strength (CS) and diametral tensile (DTS) type IV dental stones. Materials methods: A total 100 specimens were made from mould for all five groups. Four commercially available (aluminium oxide (Al2O3), silicon dioxide (SiO2), zinc (ZnO), zirconium (ZrO2)) used in this study a concentration 10%. CS DTS tests performed...
A combination of a rotating gliding arc and spouted catalytic bed was investigated in plasma-catalytic system for dry reforming methane (DRM). Different nickel-based catalysts, including Ni supported on Al2O3 or SiO2 (fresh passivated) with 0, 15, 30 wt % Ni, were investigated. It found that more stable operation the obtained Al2O3-supported catalyst rather than catalyst. noticeable increase se...
15-5PH high-strength stainless steel is an important alloy used for numerous critical components. Ultra-low oxygen content and inclusion control have become urgent problems that need to be addressed the broad application of this steel. In study, we investigate thermodynamic equilibrium Al–O morphology understand basic mechanism behind results obtained after commercial production alloy. The deox...
The dimethyl ether steam reforming reaction to generate hydrogen was tested over 1 wt % Pd/Al2O3 catalysts prepared from different precursors. The conventional catalyst prepared by incipient wetness impregnation from palladium nitrate underwent strong deactivation under reforming conditions at 823 K because of metal sintering and carbon deposition. The same occurred over the catalyst prepared f...
The effect of K2O on viscosity in CaO-SiO2-Al2O3 melt has been measured by a rotating spindle viscometer. It is indicated from the experimental results that viscosity first increases then decreases with the increasing content of K2O; the maximum viscosity occurs in the field of K2O/ Al2O3 > 1. After gradually adding K2O, the transformation of bridging oxygen (from being bonded with Al ion charg...
Electronic circuit simulation programs like SPICE have built-in models for semiconductor devices like MOSFET and BJT. However, they do not provide models for electrochemical sensors like ISFETs (Ion-Sensitive Field-Effect Transistors). This paper presents a behavioral macromodel for ISFET-based pH-sensors implemented using PSPICETM. The macromodel is then utilized to present a comparative analy...
The objectives of the present research is to appreciate the effect of synthesizing parameters on setting time and workability of Fly ash based geopolymer paste . Locally available low calcium fly ash from a thermal power plant located near Kolkata, India, was used . Fly ash used are lignite coal based and falls under class F category. The broad areas of present research include: Manufacturing o...
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