2 hydrometeorological studies - return period analysis of extreme rainfall , estimation of probable maximum precipitation , determination of design storms 2水文气象分析降雨回归期分析可能最大降水量的估计设计用暴雨模式的订定。
Hydrometeorological studies - - return period analysis of extreme rainfall , estimation of probable maximum precipitation , determination of design storms 水文气象分析降雨回归期分析、可能最大降水量的估计、设计用暴雨模式的订定。
After put into use , 580 thousand auto . battery 400thousand kvah and 422 thousand sealed battery 100kvah will be sold per year . the annual sale income will reach to 266 . 1 million rmb . the investment return period is 4 years 该项目建成后，销售汽车用蓄电池58万元， 40万kvah阀控式密封电池42 . 2万只， 10万kvah 。
All in all , the import of big - size or medium - size ethylene projects involve enormous capital investment and the investment return period is long , therefore the project investment must have predictability and advanvedness 总之，大中型乙烯项目的引进涉及到巨额资金的投入，项目的投资回报期又长，因此项目的投资一定要有一定的预见性及前瞻性。
Such a rise shortens the return period of high water level by half , that is , a high water level with a return period of 50 years would have a return period of about 25 years after the rise in the mean sea level . 杨继兴说：维多利亚港的海平面在过去五十年上升了0 . 12米，这个升幅会使最高水位的重现周期缩短约一半。即是说，原本重现周期是五十年的水位，在海平面升高后的重现周期会是大约二十五年。
Abstract : the scour process at the rear apron of shimen dam is studied through review of operation practice and inverse operation experiments . the cause of scour is explained , the scour pot was not stable after the occurence of extreme flood with the return period of 300 years , and the flood may deepen the scour pot even more severe 文摘:通过长期实践和反演试验，研究了石门拱坝投运26年来坝后冲刷坑动态发展的全过程，解释了其形成的主要原因，并指出重现期300年的特大洪水发生后，石门冲坑并未稳定，小于它的洪水仍旧造成了更深更危险的冲刷。
The scour process at the rear apron of shimen dam is studied through review of operation practice and inverse operation experiments . the cause of scour is explained , the scour pot was not stable after the occurence of extreme flood with the return period of 300 years , and the flood may deepen the scour pot even more severe 通过长期实践和反演试验，研究了石门拱坝投运26年来坝后冲刷坑动态发展的全过程，解释了其形成的主要原因，并指出重现期300年的特大洪水发生后，石门冲坑并未稳定，小于它的洪水仍旧造成了更深更危险的冲刷。
The highway project is a kind of special investment . it takes huge funds and long return period , facing business . to study the risk of highway engineering investment will bring us much benefit . therefore the enterprise will master the different results that the incertitude factors may course , understand the relationship between the risks and the benefits . so highway projects investment risk analysis urgently need to be studied deeply and popularized widely aim at the feature of highway project , some assessment method , such as analytical method , appraisal index sensitivity analysis method , reliability analysis methods , carlo analogue method etc . . on the basis of consulting a great deal of documents and analyzing some achievements , fuzzy comprehensive assessment is selected as decision support of highway project . in this paper , the one - level model and the two - level model for fuzzy theory is quoted in the highway project risk analysis . because of various hierarchies of indexes , the two - level fuzzy comprehensive assessment is used , therefore result of assessment can be reflecting realistic situations , hold the qualitable and measurable description of highway project , decrease the losses significance in this article 所以,公路工程项目投资风险分析亟待解决深入研究和普遍推广。针对公路投资项目的特点,分析比较了解析法、敏感性分析法、可靠性分析法、蒙特卡洛模拟法等综合分析方法,本文在查阅了大量文献和对已有成果进行分析的基础上,选择了模糊综合评价的方法作为公路投资项目投资建设方案的决策依据,建立了公路项目投资风险模糊评价的一级模型和二级模型,并根据评价指标的不同层次进行了二级模糊评价,保证指标的评价结果能够综合反映实际情况。通过对投资风险的定性与定量描述,可以使我们掌握公路项目投资风险分析、风险决策的方法,减少风险引起的损失,提高经济效益。
Rough calculation of investment : 1 ) methyl carbonate : total investment is rmb100 million yuan ; investment return period is 4 years . 2 ) granular dry ice powder : total investment is rmb31 million yuan ; investment return period is 2 years . 3 ) salicylic acid : total investment is rmb25 million yuan ; investment return period is 3 years . 4 ) sodium carbonate : total investment is rmb50 million yuan ; investment return period is 3 years . 5 ) ethylene urea : total investment is rmb60 million yuan ; investment return period is 4 years 投资概算： 1 、碳酸二甲酯项目总投资1亿元，投资回收期4年； 2 、颗粒干冰粉项目总投资3100万元，投资回收期2年； 3 、水杨酸项目总投资2500万元，投资回收期3年； 4 、轻质氧化鲜项目总投资2000万元，投资回收期2年； 5 、碳酸钠项目总投资5000万元，投资回收期3年； 6 、乙撑脲项目总投资6000万元，投资回收期4年。
