1) half-exchange period of sea water
海水半更换期
1.
Based on the measured data of two temporary tide stations and tidal data of many years of the Sansha Bay,the tidal characteristics of the Sansha Bay were analyzed,and the tidal prism,the average exchange rate and the half-exchange period of sea water were calculated.
根据三沙湾多年实测潮位资料和2个临时潮位站的实测资料,分析了三沙湾潮汐特征,计算了纳潮量、海水的平均交换率和海水半更换期。
2) semi-renewal period
半更换期
1.
The reclamation status before 2002 around the city is set as the actuality and the variation of the water exchange capacity of the three estuaries during different stages is simulated,and the results are used to analyze the variation of the semi-renewal period of each estuary during different reclamation stages.
在建立温州近海及河口二维潮流数值计算模式的基础上,建立了该区域的水交换数学模型,并以2002年为基准水平年,利用该模型对温州市在建和拟建的围垦工程对瓯江、飞云江和鳌江河口水交换能力的影响进行了模拟,探讨了各个河口对应于不同阶段围垦工程的水交换半更换期的变化,指出随着时间的增加,河口内污染物总量受涨、落潮流的影响呈波动状态,涨潮时增大,落潮时减小,总体呈逐渐减少的趋势,其中,瓯江口现状情况下半更换期为12 d左右,近期工程和中期工程后,半更换期为13 d左右,远期工程后,半更换期接近14 d;而飞云江口和鳌江口不同时期围垦方案的半更换期变化不大,其中飞云江口的半更换期约为7~9 d,鳌江口的半更换期约为1。
3) Exchange of ballast water at sea
海上更换压载水
4) change period
更换周期
1.
Discussion on best change period of F4203 membrane of NCS electrolyzer;
NCS电解槽F4203膜最佳更换周期探讨
5) periodic replacement
定期更换
1.
Aiming at the problem of life cycle cost of a mechanical product under periodic replacement,this paper proposes a method of penalty function which indicates the additional costs caused by the product not working to the predicted life.
针对定期更换的机械产品寿命周用费用问题，提出了罚函数的方法，用以表征由于产品没有工作到预期的寿命而引起的附加费用。
6) method of exchanging ballast water at sea
海上更换压载水方法
补充资料：海水增养殖(见海水养殖、海水增殖)
海水增养殖(见海水养殖、海水增殖)
marine aquaculture
_一一’‘~’‘以，’日y以.1日乙川髦增养殖(~ne aquacultu祀’见海水养殖·海水
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条