Reference Stars: Star with known position and/or magnitude, that are used to find the plate constants and photometric calibration of an image.
参考星：已知位置和/或星等的恒星，用于确定图片的底片常数和光度校准。
In this article, the fracture analysis on mode I crack of orthotropic functionally gradient materials is studied, under which the elastic constants changed exponentially along thickness of the plate.
文章对含i型裂纹的正交各向异性功能梯度材料板沿其板厚的弹性常数表达式呈指数函数变化时的应力-应变场进行分析。
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