文章给出了微通道换热器换热面积计算公式，选取了可以应用于微通道计算的换热系数计算关联式。
Computation formulas of microchannel heat exchanger heat transfer area are presented. So are the heat transfer coefficient correlations which are suitable for microchannels.
在全向发射不同接收指向条件下推导出散射面积计算公式，考察了此时椭圆环上的散射面积、散射强度、传播损失与接收角之间的关系。
The relationship of the scattering area, the scattering intensity, the transmit loss and the directivity of the beam with the received angle in the same condition is studied.
给出曲面积分在空间坐标的正交变换下的一个计算公式。
A calculating formula for surface integrals under orthogonal transformation of space coordinates is given.
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