Energy is the most critical resource in the life of a sensor node, therefore, its usage must be optimized to maximize the network life. If each node transmits data to sink or base station directly, then it will deplete its power quickly. 节点能量管理的优化对于延长网络寿命具有重要影响,如果每个节点直接向sink节点或基站发送信息,节点电池很快耗尽,网络也会失去作用。
Heat transfer characteristics of a microchannel heat sink with arbitrary base heat flux is analyzed by FEM ( Finite Element Method ). 利用有限元法(FEM)解决了热负荷任意分布条件下微管道换热器的换热特性分析的困难;
Owing to leaking water appearance, pressure of water and soil is changed behind the wall, and that the sink of the ground around the base holes appear. 由于漏水现象的出现,导致墙后水土压力发生改变,基坑四周地面出现不均匀的沉降或沉陷。
In addition, to guarantee the utility value of the research, ultrasonic transmit in water-coal 、 data collection and reliability of disposal circuit in sink experiment are done, which will be the base of automatical navigation – localization coming true. 另外,为了保证课题研究的实际应用价值,先后进行了超声波在水煤浆中的传播、数据采集和接收端处理电路的可靠性等实验,为导航定位的最终实现打下了坚实基础。
These results not only develop the way of applying heat sink for power electronic module, but also establish the base of commercialization of heat pipe heat sink for power electronic module. 这些结果不但拓展了大功率电子模块散热器的方式,也为热管式大功率电子模块散热器走向市场奠定了基础。