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With the rapid development of information technology, enterprises have carried out application system construction on a large scale, which generates vast amount of data. Because traditional data warehouse can't meet the demand of processing vast amount of data, the data warehouse based on cloud computing technology was born. The paper puts forward a kind of cloud data warehouse platform and has implemented...
Mesocarbon microbeads (MCMB) were prepared by heating a medium coal tar pitch at 420degC for 2 hours, with the P-toluene sulphonic acid (PTSA) and the phenyl silicone oil as the catalyst and the reaction medium respectively. After the oxidative stabilization of MCMB, the oxygen content and the number of functional groups are increased, while the micro-crystal structures become worse. However, after...
The surface flashover performance of insulators is the critical factor strongly influencing the voltage hold-off capability of high voltage vacuum devices. Based upon the simulations of electric fields, the influences of residual gas pressure, alumina insulator materials and cathode electrode geometries on the pulsed flashover performances of the hollowly cylindrical alumina insulators are experimentally...
With the rapid development of the semiconductor chip, the lithography applied to the ICs is facing great challenges. Compared to the traditional optical lithography, extreme ultraviolet lithography (EUVL) is regarded as one of the most promising technique among the next generation lithography. Among all EUVL system, the EUV source is key issue. Compared with other light sources, the discharge produced...
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