semi axis的意思|示意

The dam axis of Wanjiazhai Water Control Project is located in the wide U shaped channel. The dam type is a straight semi monolithic gravity dam.

万家寨水利枢纽拦河坝轴线处河道断面呈偏宽“U”字形，坝型为直线半整体式重力坝。

When the planetary migration occurs under the tidally interaction of a planet and a disk of gas or a planetesimal, the orbital parameters, especially, semi-major axis, of this planet will be altered.

行星迁移发生在行星与气体或星子的星盘之间进行潮汐相互作用时，这造成行星轨道参数，特别是半主轴的变更。

Then, based on the generalized method, a modified method using adjusted semi major axis is presented.

提出了一种长半轴加修正的队形设计新方法。

In order to guarantee the characteristics of frozen orbit, in-plane orbit control needs to adjust the semi-major axis, eccentricity, argument of perigee simultaneously.

为了保证冻结轨道的冻结特性，平面内轨道控制需要对半长轴、偏心率和近地点幅角都控制。

The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.

第三定律（周期定律）：各个行星绕太阳公转周期的平方和它们的椭圆轨道的半长轴的立方成正比。

In this paper, a method of aerodynamic calculation and aerodynamic performance analysis for a horizontal axis wind turbine is presented using semi-rigid wake model.

本文用半刚性尾流模型近似表示给出水平轴风轮空气动力性能的分析计算方法。