Composite structure of sterilization and descaling system for circulating cooling water

In order to resolve the hazard of biofouling and scale in circulating cooling water system of power stations, this paper takes the lead in combining high voltage pulses and high frequency pulses for sterilization and descaling process. It analyzes both electromagnetic effects and biochemical effects on sterilizing and descaling process caused by the high voltage pulses and high frequency pulses respectively. The pulse generator is designed according to the requirements of electromagnetic parameters for effective operation. The design and improvement of process chambers are assisted by electromagnetic field simulation technology. Experimental data prove that the system can output high voltage pulse whose maximum peak value reaches 7 kV and high frequency pulse whose maximum peak value reaches 100 V the frequency ranges from 500 kHz to 2 MHz. The rate of sterilization can be as high as 91,and the rate of descaling reaches 71. This system is expected to achieve the standards of industrial water treatment through further research.     

青岛市学校因病缺课症状监测网络直报系统信息的收集特点和预警机制

目的：分析学校症状监测网络直报系统信息的收集特点和预警机制,总结其在传染病防控工作中的独特作用。方法：分析网络直报系统上报数据对学校传染病预防的效果。结果：网络症状信息直报241 411次,因病缺课症状监测预警处置5 508起。结论：学校因病缺课症状监测网络直报系统有利于学校传染病的早发现,早处置,早防控,做到了快速、准确收集传染病症状预警信息,动态掌握传染病流行趋势,为后续传染病现场流调工作的顺利进行提供了第一手资料。     

生活用水水价对石河子市居民用水行为的影响分析

采用抽样调查形式对石河子市居民生活用水水费情况、水价对其用水行为的影响、水价调整对其用水行为的影响、居民可以接受的人均月水费支出情况、居民对水价的经济承受能力和心里承受能力进行了调查分析,给出了该市居民生活用水价格范围.分析表明该市居民家庭生活用水节水意识不太强,主要是由于目前石河子市生活用水水价相对较低造成的.在该市居民经济承受能力和心里承受能力均较低的情况下,水价的制定应该采用分阶段逐步提高水价和阶梯水价的方法,使居民逐步适应水价的提高.