An active receiving antenna consisting of conical helix antenna and a negative impedance changing circuit is analyzed in this paper.

对用负阻抗变换电路同圆锥螺旋天线相结合，构成的有源接收天线进行了理论分析。

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This paper simplifies the gear change calculation and machine adjustment in machining equiangular helix conical milling cutter with non-circular gear method.

本文着重介绍了用非圆齿轮法加工等螺旋角锥铣刀时，使挂轮计算和调整最简化的问题。

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There is no common normal in the conical involute gear and the fixed chordal tooth thickness can not be measured accurately because of the coexistence of helix angle and taper.

渐开线锥形齿轮由于同时存在锥度和螺旋角，使得其固定弦齿厚无法精确测量，也没有公法线。

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