根据飞行器椭圆弹道的性质、飞行器再入条件、球面几何和不动点原理给出了理想弹道的计算算法。
Baced on the properties of elliptical trajectory, the reentry conditions of the vehicles, spherical geometry, and the fixed-point theorem, an algorithm for the ideal trajectory is proposed.
根据“球面上圆构造椭圆锥面”的原理，设计了球内接三通接头。
According to the principle of constructing elliptical conical surface by the circles on a sphere, a T-joint inscribed in a sphere is designed.
本文利用移动球面法证明了一类半线性椭圆型方程组正解的存在性与不存在性。
Existence and nonexistence of positive solutions for a class of semilinear elliptic systems are considered via the method of moving spheres.
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