Applying tropical year and lunation, the exchange formula of calendar and solar calendar could be derived.
以回归年和朔望月为基础，推导出阴、阳历日期换算公式。
Applying tropical year and lunation, the exchange formula of lunar calendar and solar calendar could be derived.
以回归年和朔望月为基础，推导出阴、阳历日期换算公式。
On applying the diffraction theory and with the aid of the reciprocity theorem, an approximate formula for the radiation field of a slot cut in a metal sheet of finite size is derived.
本文应用绕射理论并借助于互易定理，导出了一个在有限尺寸金属平板上割出的一条裂缝的近似辐射埸公式。
For calculating the rotating speed of planetary gear in space turnover gear trains, a formula is derived by applying the transforming mechanism of turnover gear trains.
利用周转轮系的转化机构推导出空间周转轮系行星轮转速计算公式，并阐述行星轮转向的判定方法。
For calculating the rotating speed of planetary gear in space turnover gear trains, a formula is derived by applying the transforming mechanism of turnover gear trains.
利用周转轮系的转化机构推导出空间周转轮系行星轮转速计算公式，并阐述行星轮转向的判定方法。
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