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In order to produce the motorized spindle unit with high quality and performance and further improve its level of design and produce, a comprehensive performance test system for high-speed motorized spindle is built successfully, it can analyze the load characteristics, temperature rise, vibration, noise, accuracy and rigidity of high-speed motorized spindle unit in different working conditions. Experiments...
Ultra-supercritical coal-fired power plants are the main force of power generation in China at present and near future. High-temperature heating surface of ultra-supercritical boiler always works at extremely severe operating condition, so over-temperature and explosive tube accidents often happen. In order to fulfill the operating safe and secure requirements of utility boilers, a set of on-line...
The antioxidant content and activity, and antiproliferation activity of jujube fruit that were harvested at different harvest maturity and stored at 0 and 15°C for 15 d were studied. As fruit matured, except triterpenoid saponins, total phenolic and flavonoid concentrations of jujube were affected by harvest maturity, storage temperature and storage time very much. These antioxitant contents in fruit...
PEM fuel cell is a kind of generator with the characteristics of high efficiency and no pollution. Dynamic performance of current density distribution is important one of its parameters. In this paper, current density distribution measurement gasket and fuel cell test system were used to measure current density distribution in PEM fuel cells. Effects of fuel cell temperature and humidification temperature...
We present an approach to retrieve daily minimum and maximum 2-m height air temperatures from 18.7, and 23.8 GHz H and V polarized brightness temperature from the Advanced Microwave Scanning Radiometer for EOS (AMSR-E) during the snow free season. The approach accounts, with minimal ancillary data, for vertically integrated atmospheric water vapor, and variable surface emissivity due to open water...
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