INCEPTION OF AIR ENTRAINMENT ON STEEP SLOPE

In this paper,based on the momentum integral equation of boundary layer onthe steep slope and the equation of water depth deduced from both the equation of continuity in-cluding the effect of the boundary layer and the energy equation outside the boundary layer onthe steep slope,and with the aid of the function of velocity profile in the boundary layer,thewater depth and boundary layer are numerically computed by Runge-Kutta method.The methoddetermined parameters in the preceding equation are also discussed in detail for the laminar andturbulent flows.The water depth boundary layer and point of inception of air entrainment cal-culated by the method above agrcc extremely well with observed data obtained by prototype.     

亚美尼亚水能资源及其开发前景

严重缺乏能源矿藏资源的亚美尼亚制定了国家“小水电发展纲要”，以便最大限度地开发利用水能资源，从而减少国家对能源燃料进口的依赖性，增强国家的能源独立性。     

山区发展:共有财产、投资重点和制度安排

<正> 山区发展怎样才能建立在经济增长、环境保护和福利改善的基础之上,是许多发展中国家所面临的一个共同问题。本文提出了一个把引导山区发展的重点放在制度政策方面的改革框架。基本观点是,山区的发展是一项包括政治、经济、法律、技术、社会等各个层面的复杂的工程,孤立的经济的办法不能满足山区发展的需要;山区的发展必须最大限度地调动地方特别是村庄固有组织的积极性,充分行使地方集体行为的选择权;山区的发展必须把充分合理地利用和保护森林资源作为现阶段的发展重点,而不能过分强调工业和商业的传统扩张;山区的发展应把改善当地居民的福利作为一切努力的基本出发点,最大限度地鼓励社会预期行为。本文从五个方面进行分析和讨论。     

AN EXPERIMENTAL STUDY ON INCIPIENT CAVITATION EROSION OF FLOOD DISCHARGE TUNNEL WITH ORIFICE

Serial grades of cement mortar specimens have been tested on the model of con-crete-lining flood discharge tunnel with orifice,The results show that incipient cavitation erosionnumber is much smaller than incipient cavitation number.Based on the principle of bubble dy-namics,the flow speed effect on incipient cavitation erosion number for cement mortar is pre-sented.     

中国主权基金 欧洲谨慎欢迎

拥有2000亿美元资本金的中国主权基金，发现有些欧洲国家更容易进入，但欧洲有些国家却出于国家安全的考虑表达了谨慎处之的态度。     

REFLECTION AND TRANSMISSION OF WATER WAVES BY POROUS VERTICAL PLATES

The reflection and transmission of small amplitude surface waves by two verticalporous plates with spacing L fixed in the middle of an infinitely long channel of constant depthare studied.Analytical solutions in closed forms are obtained for the surface wave profiles.It isfound that,when the spacing L is a quarter-wavelength plus a multiple of the half-wavelength ofthe incident wave,not only the reflected wave amplitude but also the transmitted wave amplitudereduce to minima.On the other hand,when the spacing L is a multiple of the half-wavelengthof the incident wave,both the reflected wave amplitude and the transmitted wave amplitude havethe maximum values.For these two special cases,the energy dissipation caused by the twoporous plates and the water between them are also discussed.     

PRESSURE DISTRIBUTION DETERMINED BY USING MEASURED VELOCITY FIELD DATA AND RANS EQUATIONS

The current paper presents the result of a study on determining the pressure distribution along the surface of a foil section by using measured velocity field data and the Reynolds Averaged Navier-Stokes equations. The results are compared with the measured pressure data and show its satisfaction. It is a try to find a new way to determine pressure by combining the experimental data and CFD method.     

卡纳布拉瓦工程的设计和施工特点

巴西戈亚斯(Goias)州托坎廷斯河上450MW装机的卡纳布拉瓦(Cana Brava)水电工程的设计和建设创施工期最短记录，第一台机组投入运行仅用了36个月。下文说明了影响工程进展的设计和施工方面的主要特点和重要决策。     

采用辐向基础函数的降雨-径流神经网络模型

在模拟流域系统中的降水～汇流和水流情况时，采用神经网络（NN）模型很便利。然而遗憾的是，传统的NN学习程序例如向后传播程序实行起来既费时而且代价昂贵。但是，如果采用辐向基础函数（RBF）网络，用适宜的数据聚集方法将幅射中心固定，则很快就可获得满意结果。辐向基础函