semi-major axis

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。

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The influences of solar mass-loss on the change rate of the semi-major axis and the orbital period of the earth could be happened while the Sun stays on the main-sequence and evolves as a red giant on the post-main sequence.

利用二体问题的中心体变质量的Jeans理论估计了太阳目前在主序阶段和将来后主序（红巨星）阶段由于上述两种机制造成的质量损失对地球轨道改变的长期效应。

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Two pairs of point on the ellipse are used to determine the location of the center of the ellipse, orientation, and the two semi-axis.

用椭圆上的两对点确定椭圆的中心、旋转角度、长半轴、短半轴等参数。

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Fatigue Life Investigation of Semi-axis in Wheel of Landing Gear under Corrosive Environment

腐蚀条件下起落架机轮半轴疲劳寿命研究

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Non-linear equations are ( constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.

以轨道半径和轨道倾角为未知量依据星下点轨迹要求条件构建了非线性方程组，但直接求解过于复杂，采取迭代的方法解决。

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Then space target environment are analyzed, including scatter cross section, cycle distribution, inclination distribution, eccentricity distribution, perigee altitude, apogee altitude, and Semi-major axis.

接着重点对空间目标环境进行了分析，从散射截面积、周期分布、偏心率分布、倾角分布、近地点远地点高度和半长轴等多个方面进行了归纳总结。

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An ellipsoid name , semi-major axis, and inverse flattening.

参考椭球体, 椭球半长轴和.

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The ellipsoid is defined by its semi-axis, and the flattening of the ellipsoid or the semi-axis.

这个椭球面通常以它的长半轴和短半轴或者长半轴和扁率定义.

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For 45# steel car semi-axis, through determining its chemical components, microstructure, hardness, inclusion, observing the breaking section and analyzing its heat treat process, the main reason for its break is found out, the improving measures proposed.

通过检验45钢汽车半轴化学成分、金相组织、硬度、夹杂物，观察断口形貌及分析其热处理工艺，确定了造成汽车半轴断裂的主要原因，继而提出了改进措施。

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