C/S结构与B/S结构在高速公路管理软件方面的应用

结合辽宁省高速公路机电系统软件实际情况,介绍C/S结构与B/S结构及它们之间存在的差异,为高速公路管理系统软件的研发提供借鉴.     

Distribution of drifting seaweeds in eastern East China Sea

In offshore waters with relatively low primary production, drifting seaweeds composed of Sargassum species form an identical ecosystem such as an oasis in desert. Commercially important pelagic fishes such as jack mackerel (Trachurus japonicus) and yellow tail (Seriola quinqueradiata) spawn in East China Sea pass their juvenile period accompanying drifting seaweeds. Therefore drifting seaweeds are very important not only in offshore ecosystem but also fishery resources. However the distribution of drifting seaweeds in East China Sea has scarcely known. Then we conducted two research cruises of R/V Hakuho–Maru in May 2002 and in March 2004. During the cruises, drifting seaweeds were visually observed from the bridge and sampled with a towing net. The observation revealed that the drifting seaweeds were distributed along the front between the Kuroshio Current and coastal waters and mainly composed of one seaweed species, Sargassum horneri (Turner) C. Agardh from spring to early summer. There are no reports on geographical distribution of this species in the coasts south of southern Kyushu Island in Japan. Kuroshio Current flows northeastward there. Buoys with GPS attached to drifting seaweeds released off Zhejiang Province, China, in March 2005 to track their transport. Their positions monitored by ORBCOM satellite showed that they were transported to the area in East China Sea, where the drifting seaweeds were observed during the cruises, in 2 months. These facts suggest that S. horneri detached from Chinese coast in March or months earlier than March could be transported to fringe area of continental shelf and waters influenced by Kuroshio Current from March to May. Therefore the Sargassum forests, especially S. horneri, along the Chinese coast play a very important role in the ecosystem of the East China Sea as a source of drifting seaweeds.     

复励牵引电动机控制的几个问题

复励牵引电动机便于实现无级磁场削弱,控制简单,并可减少晶闸管元件数量。但复励牵引电动机在控制上也带来一些新问题:如需要预励磁;为使并联牵引电动机间的负荷分配均匀,需要采取特别措施;牵引时串励和他励的调节方式,以避免产生振荡;制动力的控制方式及在低、中速区实现较大制动力的问题。本文就这些问题提出了解决的途径。     

基于C/S结构的机车中修检修管理信息系统的设计

介绍了三层C/S结构的机车中修检修管理信息系统,阐述其系统的设计方案、结构、功能、主要特点和系统的运行效果.该系统实现了对机车检修作业过程的监控与管理,实现了检修作业过程中检修数据、检修信息的记录与分析,极大的规范了机车检修过程、提高了机车检修质量.该系统的运用是铁道部建设数字化机务段的重要组成部分.     

基于OriginPro的交通流NaSch模型的仿真开发

在分析Origin C语言体系结构及OriginPro辅助开发工具的基础上,针对交通流中经典的NaSch模型进行了系统仿真的二次开发。应用Origin C设计了模型中的主要类,借助OriginPro对象开发了模型的界面输入和输出函数,实现了模型的两个主要模拟结果:流量-密度图和时空相位图,并指出了进一步的研究方向。     

Dynamical Behavior of V~2C Control Boost Converter

A discrete iterative map model of V2C control boost converter was established to study the dynamical behaviors of the converter. By using parameter space map and bifurcation diagram, the effects of circuit parameters on the bifurcation behaviors of V2C control and current-mode control boost converters were analyzed. The phase portraits and time-domain waveforms of the V2C control boost converter were obtained by Runge-Kutta algorithm through piecewise smooth switching model. The research results indicate th...     

益肾胶囊对慢性肾小球肾炎患者sEPCR及CD62P的影响

目的 观察益肾胶囊对慢性肾小球肾炎(慢性肾炎,chronic glomerulonephritis, CGN)患者血浆可溶性内皮细胞蛋白C受体(soluble endothelium protein C receptor, sEPCR)、P-选择素(P-selectin, CD62P)及血清免疫球蛋白(Ig)、补体3水平的影响.方法 分别采用酶联免疫双抗体夹心法、流式细胞仪及免疫比浊法检测了40例健康查体者和78例患者治疗前后血浆sEPCR、CD62P及血清免疫球蛋白(Ig)、补体3水平的改变.结果 治疗前慢性肾炎患者血浆sEPCR、CD62P及血清IgA水平均明显升高(P<0.01),血清IgG、IgM及补体C3水平明显降低(P<0.01),经过3个月的治疗,治疗组患者血浆sEPCR、CD62P及血清IgA水平明显下降(P<0.05或P<0.01),IgG、IgM及补体C3明显升高(P<0.05或P<0.01).结论 益肾胶囊治疗CGN患者的作用机制之一可能与降低血浆sEPCR、CD62P水平及调节血清IgA、IgG、IgM和补体C3水平有关.     

五坐标数控铣削加工刀具扫描体的求解

建立了一种通用的刀具模型．在通用刀具模型的基础上,提出了一种求解五坐标数控铣削加工刀具扫描体的新方法．首先利用包络理论计算刀具扫描包络面在每个刀位点处的特征线方程,然后沿着特征线进行离散化获得一系列数据点,再用这些数据点构建B样条曲线组,此时特征线组和B样条曲线组所围成的空间网格即为最终的刀具扫描体．最后通过实例验证了本文所涉及到的刀具扫描体求解的正确性．     

不同原子比PdCo/C氧还原电催化剂及耐甲醇性能

采用NaBH4为还原剂制备了三种不同原子比的PdCo/C电催化剂.采用X射线衍射（XRD）和旋转圆盘电极（RDE）技术对电催化剂进行了表征.结果表明,Co的引入使PdCo/C电催化剂的晶格常数较Pd/C减小,原子比为3∶1的PdCo/C电催化剂具有最高的氧还原活性和良好的耐甲醇性能.     

一种智能化建筑系统的集成设计

随着信息技术的发展给房地产业和物业管理提出了新的要求,智能化小区将是未来发展的趋势.办公自动化系统、楼宇自动化系统和通信自动化系统是智能建筑的3个基本要素.针对3个系统的集成,利用智能建筑及网络知识提出了集成方案,并在重点考虑软件集成的基础上,以客户机/服务器的模式,结合具体环境利用Visual C++编程实现.