期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
水管站
1
作者 王兴程 《西部(新文学)(上)》 2016年第6期102-102,共1页
水泥在风化像旧伤口上的痂 让我看到了1980年的时间甚至更早 它的表情为:衰老贫穷寡言和僵硬 一同呈现的还有春天里的寒冷
关键词 中国 当代文学 诗歌 《水管站》
原文传递
A Physical Simulation Test for the RockBurst in Tunnels 被引量:4
2
作者 LI Tianbin WANG Xiangfeng MENG Lubo 《Journal of Mountain Science》 SCIE CSCD 2011年第2期278-285,共8页
According to the test results of the physical and mechanical properties of similar materials in various quality mixture, a type of material with obvious tendency of rockburst was selected to produce a large-size model... According to the test results of the physical and mechanical properties of similar materials in various quality mixture, a type of material with obvious tendency of rockburst was selected to produce a large-size model to simulate rockburst phenomena in tunnels. The prototype model comes from a typical section of diversion tunnels in Jinping Hydropower Station in China. The simulation of excavating tunnels is carried out by opening a hole in the model after loading. The modeling results indicated that under the condition of normal stresses in the model boundaries the arch top, spandrel and side walls of the tunnel produced an obvious jump reaction of stress and strain and the acoustic emission counts of the surrounding rock also increased rapidly in a different time period after the "tunnel" excavation, showing the clear features of rockburst. The spalling, buckling and breaking occurred in the surrounding rock of model in conditions of over loading. It is concluded that the modeling tunnel segment in Jinping Hydropower Station is expected to form the tensile rockburst with the pattern of spalling, buckling and breaking. 展开更多
关键词 ROCKBURST Physical simulation Similar materials (Gypsum Cement Sand Water) Strain jump SPALLING BUCKLING BREAKING
下载PDF
Economical and Environmental Effects of Pressure Reducer Valve Substituting by Small Hydro Power-Plants in Gravity Water Transmission Pipelines in Iran
3
作者 Amir Bashirzadeh Tabrizi Nassir Gifani 《Journal of Energy and Power Engineering》 2012年第2期209-215,共7页
In this work, historical background of power generation by small hydro-power plants across the world and specially across the Iran with emphasis on small hydro-power plant utilization as recovery turbine in water tran... In this work, historical background of power generation by small hydro-power plants across the world and specially across the Iran with emphasis on small hydro-power plant utilization as recovery turbine in water transmission pipeline have been attended firstly, and then, three water transmission pipelines from Chah-nemie to Zahedan city, Shirindare dam to Bojnord city and Mokhtaran desert to Birjand city in Iran have been studied as case study samples. According to the sample pipeline characteristics and pipeline topography, reachable energy have been estimated; in the next step, pay attending to reachable energy, initial investment cost, total benefit of operating period, benefit to cost ratio and other economical parameters for small hydro-power plants in case study pipelines have been presented and generated power cost of the same amount via other resources compared to the hydro-power cost. At the end, in agreement with environmental advantages of small hydro-power plants, the methods of generated power utilization, proper solution for optimization of reachable energy in water transmission pipeline and substitution of pressure reducing valve by small hydro-power plant in the pipelines as a major solution for energy recovering in water pipelines have been proposed. 展开更多
关键词 Water transmission pipeline small hydro power-plant reachable energy renewable energy.
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部