共查询到20条相似文献，搜索用时 109 毫秒
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正1概述水库大坝渗漏对水库的危害极大,如其渗漏量较大,将使水库效益显著降低;降低软弱结构面强度,使某些岩土或断裂带充填物产生渗透变形;下游地下水位抬升、建筑物地基浸没、失稳;引起坝肩、坝体滑动等环境地质问题,严重的还会造成溃坝。因此做好水库大坝的防渗可以提高水库的综合效益,对保证大坝的安全运行,保证下游农田及居民的生命和财产安全起着举足轻重的作用。 相似文献
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陆水水库运行以来坝下冲刷及影响分析 总被引：1，自引：0，他引：1
金升高 《长江工程职业技术学院学报》1992,(3)
水库运行后,由于水库对上游来沙及排沙成份的调节机制,必然对下游河床产生不同程度的冲刷,使下游局部河段水沙特性产生变化从而影响水库调度、下游防洪、水资源利用及水电机组的正常运行等.本文通过对陆水枢纽运行以来下游河道的冲刷分析,阐述水库蓄水运行以来上述因素的变化及一系列影响. 相似文献
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寒安安 《少年文艺(南京)》2003,(7)
黄师傅家的家庭成员是这样的:下岗在家的妻子阿莺,上小学二年级的儿子小昊,一只可爱的小猫拉达。虽然家里不是很富裕,但是一家人生活得倒也很幸福。拉达乖巧听话,深得黄师傅一家的喜爱。阿莺对拉达爱得不行,每天都要抱着拉达出去散步。小昊把拉达当成了自己的弟弟,总是把好吃的东西分给拉达一些。黄师傅对拉达也是好得没话说,天天帮它洗 相似文献
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建国以来,我国兴建了一大批中、小型水库,这些水库为防洪,抗旱和国民经济建设起到了重要作用但近年来许多水库大坝出现了渗屑,严重威胁着水库下游人民的生奇财产安全.为了人民群众的生命财产不受损失,必须找出这些病库的渗漏原因,运用确实可行的加固方法,加以整治. 相似文献
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艾斯美拉达是雨果在《巴黎圣母院》中塑造的重要人物之一。她拥有迷人的外貌、高超的舞艺和善良的心地,是乞丐和穷人的知友。她不幸的遭遇与悲惨的结局使人们为之叹息,但她纯美的形象却在世界文学的画廊里留下了浓重的一笔。艾斯美拉达是纯美的化身,善良的使者,但她的纯美却遭到摧残、欺骗,以悲剧结尾。本文对整部小说中的少女艾斯美拉达的纯洁美丽形象进行分析,以深化读者对艾斯美拉达纯美形象的理解。 相似文献
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水库的兴建不仅仅只是调节洪水和对水资源的综合利用 ,它对整个河流的水情及河床演变都带来直接影响。本文通过对丹江口水库以下的汉江沙洋河段观测资料整理分析 ,说明了水库兴建后引起的下游河流的水量、沙量、流水作用方式及强度、河床深泓点及主河槽、河床横断面的变化情况 ,对变化的机制作了分析 ,对水库下游的汉江河道演变趋势及对未来将产生的影响进行了分析提示 相似文献
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水库的兴建不仅仅只是调节洪水和对水资源的综合利用，它对整个河流的水情及河床演变都带来直接影响。本通过对丹江口水库以下的汉江沙洋河段观测资料整理分析，说明了水库兴建后引起的下游河流的水量、沙量、流水作用方式及强度、河床深泓点及主河槽、河床横断面的变化情况，对变化的机制作了分析，对水库下游的汉江河道演变趋势及对未来将产生的影响进行了分析提示。 相似文献
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国内外对于尾矿库安全问题非常重视,通过从风险角度出发研究尾矿库溃坝事故安全管理问题,对国内外尾矿库溃坝事故风险管理现状进行分析,讨论尾矿库溃坝事故风险管理的方法,认为尾矿库溃坝事故风险管理重点应从尾矿库的规划选址和工程设计两个方面进行,从而提出切实可行的尾矿库溃坝事故风险管理措施。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献