应用M68HC908LJ12设计单相复费率电能表

介绍了以Motorola公司的M68HC908LJ12高性能单片机为CPU的单相复费率电能表的硬、软件设计和抗干扰设计。     

220 kV母线保护改造的技术探讨

母线保护是保证电网稳定运行的重要设备,就电磁继电器母线保护改造为RCS915微机母线保护工作中所遇到的接线、试验等问题进行了分析,并提出了相应解决方法.     

LJ船用微机测流系统的应用

LJ船用微机测流系统是能自动完成测深、测速、流量计算等一系列工作的水测验仪器。经过哈尔滨水站检验，证明该系统可以在大中河流测站使用。     

Does cadmium contribute to human hypertension

In 1962 Schroeder reported marked hypertension in rats chronically fed a very low cadmium diet and 5 ppm cadmium in water, but subsequently he reported only moderate hypertension. Using Schroeder's food and water, but a slightly less cadmium-free environment, we repeatedly induced mild hypertension with 5 ppm cadmium, mild because control pressures were higher not because cadmium-fed animals had lower pressures. Seven laboratories have observed hypertension after feeding cadmium; six have not. Thus, chronically fed cadmium can induce hypertension in rats, but conditions are important. Additional observations on cadmium-induced hypertension indicate that: (1) concentrations from 0.1 to 5 ppm cadmium in water are pressor; (2) sex, strain, and age of animals are apparently not limiting factors; (3) there is associated sodium retention; (4) there is a concomitant decrease in the high energy phosphate content of tissues. Rats with cadmium-induced hypertension have renal cadmium concentrations which bracket those of the average environmentally exposed American or European. Finally, renal cadmium concentrations in man were significantly higher (p less than 0.05) for "hypertensives" than for normotensive "matches" in five of nine reported series, lower in one, and similar in three, with all series being small and suboptimal in subject selection.     

高温高压CO_2状态方程研究

针对爆轰环境下高温高压气体的热力学状态描述,本研究提出了一种基于Lennard-Jones(LJ)势能函数的对比态维里型状态方程VHL(Viral-Han-Long)。基于该状态方程形式和优化的LJ势参数,计算了爆轰产物气体组分CO_2的压力、体积和温度(pVT)热力学关系,并与VLW状态方程的计算结果进行了比较,结果表明,采用VHL状态方程计算得到CO_2体积平均绝对偏差为0.971%,最大偏差为4.04%,采用VLW状态方程计算所得平均绝对偏差20.2%,最大偏差87.149%。VLW状态方程在描述CO_2的高温高压热力学状态时,具有明显的温度相关性,在爆轰环境温度下,计算所得体积偏差随温度的升高而逐渐减小。与VLW状态方程相比,VHL状态方程能够更好的描述爆轰环境下高温、高压CO_2气体的pVT热力学关系。     

基于RCS-915型微机母线保护的应用

针对国产RCS-91 5型新一代微机母线保护应用中的几个问题进行了分析,并提出解决方法.     

三相多功能复费率电能表

文中详细介绍ADE7758计量芯片及其特性,提出以M68HC908LJ12微处理器为基础的三相多功能复费率电能表的硬件和软件设计,具有电路简洁、可靠性高、开发周期短等优点.     

Molecular dynamics study on the cluster structure of the 2‐D LJ fluid and water

A molecular dynamics simulation has been performed for a two‐dimensional Lennard–Jones (12‐6) fluid. A saturated liquid at low temperature, compressed liquid, and fluid at supercritical temperatures with various densities were analyzed. Number of bonds per molecule, lifetime of bonds, connectivity of molecules to form clusters, stability of clusters, and their responses to temperature and density are compared with those of a hydrogen bond in water. © 2000 Scripta Technica, Heat Trans Asian Res, 29(3): 218–232, 2000     

220kV母线保护改造问题

对母线保护改造工作中所遇到的二次接线问题进行分析,并提出相应解决办法。     

基于TinyOS的无线传感器网络节点设计与实现

针对无线传感器网络节点,首先从硬件上设计了一个无线传感器节点硬件平台,采用MSP430F5438A和915 MHz射频相结合的方案,具有比一般节点更强的处理性能和更远的传输距离。软件方面,以Tiny OS作为嵌入式操作系统,针对该节点平台进行移植,降低了节点应用开发难度,且具有很高的代码移植性。最后,通过组网实验和与Telos B节点、Mica Z节点的性能对比测试,验证了该节点平台的有效性和可靠性。