It is shown that the interface linear graded DBR has the minimum roughness and better surface morphology, which can be used in the fabrication of vertical cavity surface emitting lasers.
结果表明，相同周期数情况下线性渐变dbr相对于其他两种结构粗糙度最小，具有良好的表面形貌，可以应用于垂直腔面发射激光器的研制。
Graded materials may also be used with a gradient from a 100% concentration of ceramic at one surface, and gradually changing into a 100% metal at the other surface, would be advantageous.
也可使用梯度从一个表面处陶瓷浓度为100%逐渐变化到另一表面处金属浓度为100%的级配材料，这将是有优势的。
The raisin has different size and complicated surface, so it couldn't be graded well only by color and naked eyes.
葡萄干大小不一，表面情况复杂，单纯依靠颜色特征或用肉眼判断，均达不到较好的分级效果。
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