Optimization of Industrial Structure Considering the Uncertainty of Water Resources

This paper developed a stochastic linear fractional programming model for industry optimization allocation base on the uncertainty of water resources incorporating chance constrained programming and fractional programming. In this paper, the stochastic linear fractional programming is used in the real word. The development SLFP has the following advantages: (1) The model can compare the two aspects of the targets; (2) The model can reflect the system efficiency intuitively; (3) The model can deal with uncertain issues with probability distribution; (4) The model can give different optimal plans under different risk conditions. The model has a significant value for the industry optimization allocation under uncertainty in local and areas to achieve the maximum economic benefits and the full use of the water resources.     

沧州肃宁县垣城南浅层地下水漏斗区现状及治理对策

对河北省沧州市浅层地下水肃宁县垣城南漏斗区的形成原因及现状进行了分析,并对垣城南漏斗中心近30年的水位变化进行了简析。阐述了地下水漏斗造成的危害,并对控制漏斗发展的措施进行了探讨,旨在呼吁人们节约用水,合理开发地下水,保护好水环境。     

陆水水库水环境保护需求分析

为保证陆水水库水源区的水质安全,缓解和控制水环境污染、水质恶化的状况,依据多年水质实测资料,对陆水水库水污染情况进行了分析评价。结果表明,陆水水库水体水质总体良好,达到Ⅲ类标准,但由于库区经济的快速发展,水质存在恶化的趋势,点源、面源污染日趋严重,部分库湾、支流出现富营养化,且存在一些潜在的污染风险源。针对库区存在的水环境问题,提出了开展水质监测体系建设、水污染的“源-输移-汇”控制、微量毒害污染物防治、生态工程修复等关键技术研究的建议,以切实保护陆水水库水环境,为保障水源质量打好基础。〖HJ〗     

Synthesis and characterization of layered perovskite-type organic-inorganic hybrids (R-NH3)2(CH3NH3)Pb2I7

Layered organic-inorganic hybrids containing bilayer perovsikte (R-NH3)2(CH3NH3)Pb2I7 (where R=C12H25,C6H5C2H4) were synthesized by reactions in solution. The influences of the solvents and the reactant ratio on the structures of the products were investigated. The structures and the properties of the hybrids were characterized using X-ray diffraction (XRD) and ultraviolet and visible (UV) adsorption spectra. For comparing with the bilayer perovskite hybrids in structure and band gap magnitude, the hybrids containing monolayer perovskite (R-NH3)2PbI4 were also synthesized and characterized. The results demonstrate that the thickness of inorganic layer has obvious effect on the tunneling magnitude of the band gap but the organic part can be micro actuator of band gap.     

不同叶片安装角的轴流泵内部流动特性分析

结合浙江省某更新改造泵站,在三维湍流Navier-Stokes控制方程的基础上,采用标准k-ε模型和SIMPLEC算法,对不同叶片安装角的轴流泵内部全流道流场进行了数值模拟,分析讨论了不同安装角下的叶片静压分布图、叶片相对速度分布图,对轴流泵的扬程进行了预测,最后给出了该轴流泵合适的叶片安装角。     

蒲石河抽水蓄能电站下库蓄水对下游的影响

为了确保蒲石河抽水蓄能电站工程按期投产发电,保证水库及电站初期蓄水和发电运行安全,就不同蓄水方案对下游各业用水部门的影响进行了分析。下游各行业用水的调查分析,为尽可能减轻水库初期蓄水影响,制定切实可行的电站初期下闸蓄水方案提供了技术支撑。     

移动台车栏板辅助浇筑系统的设计与应用

蒲石河工程下水库大坝顶部混凝土护栏位于坝顶临空边沿,钢筋绑扎和模板支立作业难度大,施工时存在安全隐患。为此,蒲石河工程设计了移动台车栏板辅助浇筑系统并成功应用。实践表明,作业台车设计可靠、安全稳定、操作简便、定位准确、移动方便,保障了施工人员人身安全,节约了成本,加快了工期,提高了模板支立质量,值得类似工程借鉴并推广使用。     

蒲石河抽水蓄能电站计算机监控系统的设计与应用

简要介绍了蒲石河抽水蓄能电站南瑞SSJ-3000计算机监控系统的设计原则、系统结构与功能以及系统特点,该监控运行稳定可靠,完成了各种运行工况的任务要求,能适应大型抽水蓄能机组启停频繁、工况复杂的特点,功能达到设计要求,满足电站的监控要求。     

Hydrological Changes of the Irtysh River and the Possible Causes

Hydrological changes of the Irtysh River were analyzed concerning the changes of annual runoff and its distribution features within a year measured by coefficient of variation and concentration degree. Abrupt changes were detected by the heuristic segmentation method. Possible causes of the hydrological changes were investigated considering climate changes and human activities (especially the reservoir operation). The Mann-Kendall method was applied to estimate whether the temperature and precipitation was changed. The increased precipitation in winter may increase the runoff of April. The increased temperature and the decreased precipitation in the flood season may decrease the runoff. At the middle reaches, the impact of the reservoirs at the upper reaches is significant and may be the main factor leading to the abrupt decreases in annual runoff and its intra-annual variability and concentration. The increased water surface area of the reservoirs aggravates the evaporation and leads to annual runoff reduction. The reservoirs regulate runoff by storing water in the flood season and releasing water in the dry season. While at the lower reaches, the annual runoff remained steady and its intra-annual variation and concentration were reduced gradually because the impact of the reservoirs is relative small and the climatic impact may be more relevant.