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1)  economical diameter
经济直径
1.
Research on economical diameter sequence of power tunnel for pumped storage power plants;
抽水蓄能电站引水系统经济直径的探讨
2)  economic diameter
经济直径
1.
The calculation formula of dynamic economic diameter of a pressure bury steel pipe of the routine hydropower station has been derived according to the dynamic economic analysis method for simplifying calculation of economic diameter of a pressure bury steel pipe of the routine hydropower station and enchancing dynamic economic benefit of project construction.
为了简化常规水电站埋藏式压力钢管经济直径计算工作,提高工程建设的动态经济效益,本文推导了按动态经济分析方法确定常规水电站埋藏式压力钢管经济直径的公式,并以实例作了论
2.
The calculation formula of dynamiceconomic diameter of a non-lined pressure tunnel of a hydro-power station has been derived according to dynamic economic analysis method for simplifying calculation of economic diameter of pressure tunnel of a hydro-power station and enhancing dynamic economic benefit of project construction.
为简化水电站有压隧洞经济直径计算工作,提高工程建设的动态经济效益,推导了按动态经济分析方法确定水电站不衬砌有压隧洞经济直径的公式,并以实例作了论证。
3)  economic pipe diameter
经济管径
1.
The Newton iteration method is used to solve the economic pressure on the unknown node, so as to calculate the economic head loss and economic pipe diameter of each section, .
采用牛顿迭代法来求解各未知节点的经济水压,进而得出各管段的经济水头损失、经济管径和水源二级泵站的经济扬程。
4)  economical pipe diameter
经济管径
1.
The choice of economical flow rate of water carriage engineering and economical pipe diameter is discussed too.
结合工程实例对城市输水工程管材的选择进行了论述 ,介绍了各种管材的优缺点 ,简述了输水工程经济流速与经济管径的选择 ,探讨了在设计施工中应注意的问题并提出了相应的改进措施 ,以适应国民经济的发展 ,缓解城市的工业用水与生活用水困难的问题。
5)  economical span length
经济跨径
1.
The concept of economical span length was firstly proposed,which reveal the economical principle for the layout of span number and length to the multi-span.
提出经济跨径的概念,不仅揭示了多跨桥梁孔跨布置的经济性原则,而且还可以清楚地说明世界桥梁界面临的两大挑战即桥梁大跨度技术与深水基础技术之间的关系。
6)  economical tunnel diameter
经济洞径
1.
Namely when the tunnel total expense is the minimum,the corresponding tunnel diameter is the best,this diameter is considered as economical tunnel diameter.
如要选取适当的发电隧洞洞径,则要寻求在隧洞计算期内的总费用最小值,即只有当隧洞的总费用达到最小时的洞径才是最佳的,此时对应的洞径即是经济洞径。
补充资料:当量比表面直径、表面积体积平均直径
分子式:
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性质:又称当量比表面直径、表面积体积平均直径。是颗粒群表面积分布的平均直径。其意义为与颗粒群的粒形相同,总体积相同、总表面积相同,且粒度均匀的一个假想颗粒群的粒度。亦即指与该颗粒群的粒形相同,比表面积相同的一个颗粒的粒度。 

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