在大气压介质阻挡放电的实际应用中,空气介质阻挡放电具有极其广泛的工业化应用前景。目前,空气均匀放电的获得仍比较困难,且诊断均匀性的依据缺乏可信的依据。文章采用粒子云网格法(Particle in Cell,PIC)与蒙特卡罗碰撞(Monte Carlo C...在大气压介质阻挡放电的实际应用中,空气介质阻挡放电具有极其广泛的工业化应用前景。目前,空气均匀放电的获得仍比较困难,且诊断均匀性的依据缺乏可信的依据。文章采用粒子云网格法(Particle in Cell,PIC)与蒙特卡罗碰撞(Monte Carlo Collision,MCC)方法模拟了放电过程中粒子的运动情况,研究大气压下空气介质阻挡放电的发展过程,然后讨论介质厚度、电源频率对形成均匀放电的影响,并研究这两种因素对等离子体密度的影响。模拟结果表明:介质厚度在d≥1.5 mm时可获得没有放电细丝的电流波形;电源频率高于2.5 kHz时,放电细丝是难以避免的。在能够形成均匀放电的条件下,将介质厚度适当的调整在1.5 mm附近,提高电源频率,将产生更高的等离子体密度。展开更多
The Pissy granite quarry of Ouagadougou in Burkina Faso exists since 2006, and it is a source of financial incomes for many poor families working there. The Problem-In-Context framework (PiC), lead the current study t...The Pissy granite quarry of Ouagadougou in Burkina Faso exists since 2006, and it is a source of financial incomes for many poor families working there. The Problem-In-Context framework (PiC), lead the current study to understand better the quarry exploitation and structuration. Different motivations guide the quarry actors. Through those motivations, different solutions were suggested, mainly the shutdown of the quarry as the best way to decrease the impacts of the quarry exploitation on the environment, particularly regarding the air pollution and the loss of biodiversity in the area. The Pissy granite quarry is not recognized by the country’s legislation and this study is presenting the site organization. They are three main actors on the site and the tertiary actors are the ones having more incomes comparing to the primary and secondary actors of the chain. There is a need to evaluate the shell life of the quarry if the shutdown is not the final option chosen by the country. This evaluation should be a way to restructure the field and to have more incomes from it. Many standards exist in the country to guide the quarries and mines exploitation but they do not have impact on the Pissy granite quarry because of its non-reorganization.展开更多
Objective To introduce the accession procedure and evaluation of PIC/S,and help relevant departments in China to understand the requirements of PIC/S in detail,and to promote the process of China’s entry into PIC/S.M...Objective To introduce the accession procedure and evaluation of PIC/S,and help relevant departments in China to understand the requirements of PIC/S in detail,and to promote the process of China’s entry into PIC/S.Methods The procedures and steps of joining PIC/S,the evaluation process of PIC/S,and the experience of several countries in joining PIC/S were introduced and analyzed,which could help the relevant personnel in China understand the specific contents.Results and Conclusion According to the requirements of PIC/S,it is necessary to establish a unified GMP quality management system.展开更多
文摘在大气压介质阻挡放电的实际应用中,空气介质阻挡放电具有极其广泛的工业化应用前景。目前,空气均匀放电的获得仍比较困难,且诊断均匀性的依据缺乏可信的依据。文章采用粒子云网格法(Particle in Cell,PIC)与蒙特卡罗碰撞(Monte Carlo Collision,MCC)方法模拟了放电过程中粒子的运动情况,研究大气压下空气介质阻挡放电的发展过程,然后讨论介质厚度、电源频率对形成均匀放电的影响,并研究这两种因素对等离子体密度的影响。模拟结果表明:介质厚度在d≥1.5 mm时可获得没有放电细丝的电流波形;电源频率高于2.5 kHz时,放电细丝是难以避免的。在能够形成均匀放电的条件下,将介质厚度适当的调整在1.5 mm附近,提高电源频率,将产生更高的等离子体密度。
文摘The Pissy granite quarry of Ouagadougou in Burkina Faso exists since 2006, and it is a source of financial incomes for many poor families working there. The Problem-In-Context framework (PiC), lead the current study to understand better the quarry exploitation and structuration. Different motivations guide the quarry actors. Through those motivations, different solutions were suggested, mainly the shutdown of the quarry as the best way to decrease the impacts of the quarry exploitation on the environment, particularly regarding the air pollution and the loss of biodiversity in the area. The Pissy granite quarry is not recognized by the country’s legislation and this study is presenting the site organization. They are three main actors on the site and the tertiary actors are the ones having more incomes comparing to the primary and secondary actors of the chain. There is a need to evaluate the shell life of the quarry if the shutdown is not the final option chosen by the country. This evaluation should be a way to restructure the field and to have more incomes from it. Many standards exist in the country to guide the quarries and mines exploitation but they do not have impact on the Pissy granite quarry because of its non-reorganization.
文摘Objective To introduce the accession procedure and evaluation of PIC/S,and help relevant departments in China to understand the requirements of PIC/S in detail,and to promote the process of China’s entry into PIC/S.Methods The procedures and steps of joining PIC/S,the evaluation process of PIC/S,and the experience of several countries in joining PIC/S were introduced and analyzed,which could help the relevant personnel in China understand the specific contents.Results and Conclusion According to the requirements of PIC/S,it is necessary to establish a unified GMP quality management system.
