DYC-1型超声对位仪

火车油罐车装油过程中需要实现装油鹤管与油罐车罐口的自动对位.DYC—1型超声对位仪将三只超声探头分别设置在鹤管的前、后、侧面,利用超声探测的原理对油罐车的罐口进行探测对位.根据三个探头所接收到的超声反射信号的组合,可以判定鹤管相对于罐口的位置,并给出控制鹤管运动的相应指令,以实现鹤管对罐口的超声自动对位.该仪器在探头设计和电路上采取了措施,可有效地防止声、电干扰,五级风以下时,能立即给出对准指示信号,对准率为100％.     

QSC-1、QSC-2型超声驱鼠器

老鼠为人类之大敌.历来人类控制鼠害是用捕杀和毒杀的方法,收到一定效果.但由于老鼠生性狡猾、行动敏捷、生存力强、繁殖率高,鼠害仍然普遍存在.在一些特别需要防止老鼠的场所,如图书资料库、计算机房、电器控制室、药品库以及其它仓库、饭馆、食堂等,除捕杀外,驱鼠也是一种保护物资、防止事故、减少     

Simulation of crowd dynamics in pedestrian evacuation concerning panic contagion: A cellular automaton approach

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.