非球面光学元件广泛用于不同领域，但它们的成功应用主要取决于其质量和制造费用。
Aspherical optics are widely used in different fields. But the successes of their applications depend mainly on their quality and manufacturing costs.
球面上的最近邻查询在空间数据库最近邻查询领域具有重要的意义。
The nearest neighbor query on the spherical surface has great significance in the nearest neighbor query of the spatial database.
双臂半球面螺旋天线具有较宽的阻抗带宽和方向图带宽，工作频带内增益变化不大，该天线在军事卫星通信领域具有广阔的应用前景。
The two-arm hemispherical helical antenna has very wide impedance and pattern bandwidth, and its gain in the whole band is larger and wave mildly, which show that it is of great applicat…
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