To realize a stable addition of foaming agent used for foam technology, a new adding method using the jet cavitation was introduced, and its performance was investigated experimentally under different operating condit...To realize a stable addition of foaming agent used for foam technology, a new adding method using the jet cavitation was introduced, and its performance was investigated experimentally under different operating conditions. Experimental results show that the bubble region in the jet device has a constant vapor pressure, which creates a good condition for liquid absorption, while it shrinks with increasing outlet pressure. The liquid absorption amount keeps unchanged when the outlet pressure is lower than a critical value. The critical outlet pressure increases by 40% with decreasing cavitation absorption amount, which is especially suitable for mini-flow quantitative addition of foaming agent used for foam dust suppression. Its effectiveness on suppressing mine dust was evaluated in a heading face of underground coal mines. Field application indicates that the reliable and simple foaming system adopting the new adding method makes a marked dust suppression effect. The working environment of heading face is significantly improved, ensuring the safe tunneling and personal security.展开更多
Si 0.8 Ge 0.2 strained epilayer were grown on Si substrates by rapid thermal process/very low pressure-chemical vapor deposition (RTP/VLP-CVD) and implanted with boron at 40 keV,a dosage of 2.5×10 14 ...Si 0.8 Ge 0.2 strained epilayer were grown on Si substrates by rapid thermal process/very low pressure-chemical vapor deposition (RTP/VLP-CVD) and implanted with boron at 40 keV,a dosage of 2.5×10 14 cm -2 .Rapid thermal annealing (RTA) and steady-state furnace annealing with different temperature and time period were performed for comparison.Results indicate that RTA is better than furnace annealing.After RTA at 750 ℃～850 ℃ for 10 s or at 700 ℃ for 40 s,the implantation induced damage can be removed,the carrier mobility was about 300 cm 2/V·s and the activity was nearly 100%.展开更多
基金Project(51474216)supported by the National Natural Science Foundation of ChinaProject supported by the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions,ChinaProject(2012DXS02)supported by the Fundamental Research Funds for the Central Universities,China
文摘To realize a stable addition of foaming agent used for foam technology, a new adding method using the jet cavitation was introduced, and its performance was investigated experimentally under different operating conditions. Experimental results show that the bubble region in the jet device has a constant vapor pressure, which creates a good condition for liquid absorption, while it shrinks with increasing outlet pressure. The liquid absorption amount keeps unchanged when the outlet pressure is lower than a critical value. The critical outlet pressure increases by 40% with decreasing cavitation absorption amount, which is especially suitable for mini-flow quantitative addition of foaming agent used for foam dust suppression. Its effectiveness on suppressing mine dust was evaluated in a heading face of underground coal mines. Field application indicates that the reliable and simple foaming system adopting the new adding method makes a marked dust suppression effect. The working environment of heading face is significantly improved, ensuring the safe tunneling and personal security.
文摘Si 0.8 Ge 0.2 strained epilayer were grown on Si substrates by rapid thermal process/very low pressure-chemical vapor deposition (RTP/VLP-CVD) and implanted with boron at 40 keV,a dosage of 2.5×10 14 cm -2 .Rapid thermal annealing (RTA) and steady-state furnace annealing with different temperature and time period were performed for comparison.Results indicate that RTA is better than furnace annealing.After RTA at 750 ℃～850 ℃ for 10 s or at 700 ℃ for 40 s,the implantation induced damage can be removed,the carrier mobility was about 300 cm 2/V·s and the activity was nearly 100%.
