针对一种新型磁性阴离子交换树脂(MIEX)的再生工艺进行优化研究。探讨了不同再生方式对MIEX性能恢复的影响,在最佳再生方式基础上,研究了再生液浓度及流量与MIEX再生效果之间的关系,以及MIEX的可再生次数。试验结果表明:MIEX...针对一种新型磁性阴离子交换树脂(MIEX)的再生工艺进行优化研究。探讨了不同再生方式对MIEX性能恢复的影响,在最佳再生方式基础上,研究了再生液浓度及流量与MIEX再生效果之间的关系,以及MIEX的可再生次数。试验结果表明:MIEX再生方式中以动态逆流再生效果最好,最佳再生液为质量分数10%的Na Cl溶液,最佳流量为15 m L/min。随着再生次数不断增加,MIEX处理效果小幅下降,当再生次数达到25次时,MIEX性能明显下降,难以有效再生。展开更多
The study of the panic evacuation process is of great significance to emergency management.Panic not only causes negative emotions such as irritability and anxiety,but also affects the pedestrians decision-making proc...The study of the panic evacuation process is of great significance to emergency management.Panic not only causes negative emotions such as irritability and anxiety,but also affects the pedestrians decision-making process,thereby inducing the abnormal crowd behavior.Prompted by the epidemiological SIR model,an extended floor field cellular automaton model was proposed to investigate the pedestrian dynamics under the threat of hazard resulting from the panic contagion.In the model,the conception of panic transmission status(PTS)was put forward to describe pedestrians’behavior who could transmit panic emotions to others.The model also indicated the pedestrian movement was governed by the static and hazard threat floor field.Then rules that panic could influence decision-making process were set up based on the floor field theory.The simulation results show that the stronger the pedestrian panic,the more sensitive pedestrians are to hazards,and the less able to rationally find safe exits.However,when the crowd density is high,the panic contagion has a less impact on the evacuation process of pedestrians.It is also found that when the hazard position is closer to the exit,the panic will propagate for a longer time and have a greater impact on the evacuation.The results also suggest that as the extent of pedestrian’s familiarity with the environment increases,pedestrians spend less time to escape from the room and are less sensitive to the hazard.In addition,it is essential to point out that,compared with the impact of panic contagion,the pedestrian’s familiarity with environment has a more significant influence on the evacuation.展开更多
文摘针对一种新型磁性阴离子交换树脂(MIEX)的再生工艺进行优化研究。探讨了不同再生方式对MIEX性能恢复的影响,在最佳再生方式基础上,研究了再生液浓度及流量与MIEX再生效果之间的关系,以及MIEX的可再生次数。试验结果表明:MIEX再生方式中以动态逆流再生效果最好,最佳再生液为质量分数10%的Na Cl溶液,最佳流量为15 m L/min。随着再生次数不断增加,MIEX处理效果小幅下降,当再生次数达到25次时,MIEX性能明显下降,难以有效再生。
基金supported by the National Key Technology Research and Development Program of China(Grant No.2019YFC0810804)the National Natural Science Foundation of China(Grant No.7197010332)。
文摘The study of the panic evacuation process is of great significance to emergency management.Panic not only causes negative emotions such as irritability and anxiety,but also affects the pedestrians decision-making process,thereby inducing the abnormal crowd behavior.Prompted by the epidemiological SIR model,an extended floor field cellular automaton model was proposed to investigate the pedestrian dynamics under the threat of hazard resulting from the panic contagion.In the model,the conception of panic transmission status(PTS)was put forward to describe pedestrians’behavior who could transmit panic emotions to others.The model also indicated the pedestrian movement was governed by the static and hazard threat floor field.Then rules that panic could influence decision-making process were set up based on the floor field theory.The simulation results show that the stronger the pedestrian panic,the more sensitive pedestrians are to hazards,and the less able to rationally find safe exits.However,when the crowd density is high,the panic contagion has a less impact on the evacuation process of pedestrians.It is also found that when the hazard position is closer to the exit,the panic will propagate for a longer time and have a greater impact on the evacuation.The results also suggest that as the extent of pedestrian’s familiarity with the environment increases,pedestrians spend less time to escape from the room and are less sensitive to the hazard.In addition,it is essential to point out that,compared with the impact of panic contagion,the pedestrian’s familiarity with environment has a more significant influence on the evacuation.
