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The repetition period will be 2 hours, and sampling will be by a winchoperated submersible pumping system which will continuously scan the radondeficient layer.


An efficient pumping system made from association of cryo and turbo molecular pumps allows a background hydrogen pressure of ? 105 Torr during the growth.


The energy balance of the pumping system with the line is analyzed from the viewpoint of optimizing the pumping efficiency of metalvapor lasers.


Results on this new fiber optic interface system are compared with those obtained previously with the traditional pumping system.


A traditional dissolution pumping system was recently replaced with a fiber optic interface between the spectrometer and the samples.

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 The phase ratio, namely the ratio of air and water of the mixed flow in airlift pumping systems is studied in this paper. An analytic calculating system for airlift pumping is derived. It reveals that when the water level varies with time, as in the case of emergency pumping, the airlift pumping has different type of QH curve with that of the conventional centrifugal pumps. For the airlift pumping, the unit power consumption is in inversed proportion with the flow rate... The phase ratio, namely the ratio of air and water of the mixed flow in airlift pumping systems is studied in this paper. An analytic calculating system for airlift pumping is derived. It reveals that when the water level varies with time, as in the case of emergency pumping, the airlift pumping has different type of QH curve with that of the conventional centrifugal pumps. For the airlift pumping, the unit power consumption is in inversed proportion with the flow rate and the pumping efficiency increases with the increase of the flow rate.  本文对空气扬水混流运动的相率,即气水比进行了研究。提出了空气扬水数理制解析计算系,从而阐明了空气扬水作变水位运行时的下凹型强超流时效、功率同流量成反比、效率随流量的变大而上升的高变位功效等独特的排淹特性。  Since a mine pumping system can generally be simplified into a complicated pipeline system in series, the transient process is simulated by a method of characteristic line. Bascd on the mathematical models now available, e.g. wave velocity equation, characteristics equations of finite difference and pump group equation, some corresponding boundary condition equations for the pump system are established, such as conduit outlet equations with variable head, conduit inlet equations with constant... Since a mine pumping system can generally be simplified into a complicated pipeline system in series, the transient process is simulated by a method of characteristic line. Bascd on the mathematical models now available, e.g. wave velocity equation, characteristics equations of finite difference and pump group equation, some corresponding boundary condition equations for the pump system are established, such as conduit outlet equations with variable head, conduit inlet equations with constant water level, motion equation of a nonreturn valve. Based on these mathematical models, a programme for simulating the transient process is written in FORTRAN 77 language. The calculated results are quite close to the measured data. The calculated transient curve and the measured data curve arc plotted on one coordinate system by the computer for comparison, which is self explaining.  根据矿井排水系统一般可以简化为串联复杂管路系统的特点,采用特征线法模拟其断电停泵的瞬变过程。在已有数学模型(如波速方程、有限差分形式的特征线方程及泵机组方程等)的基础上,本文结合矿井排水系统,建立了一些相应的边界条件方程,如变水头的管道出水口方程、恒定水位的管道进口方程以及逆止阀的关闭运动方程等。依据这些数学模型,用FORTRAN77语言编制出瞬变过程的模拟计算程序。用计算机算出的结果和实测结果基本一致;通过计算机打印在同一坐标系中的计算和实测瞬变曲线可对瞬变过程一目了然。  This paper presented a mathematical model of the optimum valve stroking of waterhammer control and protection in pumping system. Combining with a practical project, the authors have made theoretical calculations and tests in the study of optimum twostage closure policies of butterfly valve and discussed the characteristics of waterhammer protection of valve stroking. The theoretical calculation are in good agreement with testing results.  提出了泵系统水锤控制与防护的最优阀调节数学模型,结合实际工程进行了两阶段关闭蝶阀的最优关阀程序的计算分析与模型实验研究;讨论了阀调节的水锤防护特性,理论分析与实验结果吻合较好。   << 更多相关文摘 
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