为在压气机整机进入深度失速前检测到失速起始信号，提出了一种基于平均数值差分的短周期扰动检测方法。
To detect stall inception signal before the whole compressor running into deep rotating stall, a method based on averaged numerical difference is developed to detect short length scale disturbance.
采用前向差分预测能够较准确地预测出下一时刻的信号强度，提高了切换触发速度和切换判决精度。
And it is combined with the forward difference prediction for the signal strength of next time to improve the handoff accuracy.
本文介绍了基于广角隐式有限差分单程波传播算子的起伏地表叠前深度偏移方法，并对SEG山前带推覆构造模型进行了检验。
The paper introduced the prestack depth migration from relief surface based on implicit wide-angle finite-difference one-way propagation operator and used SEG piedmont nappe structure model for test.
后测的分数明显高于前测的分数，后测平均分比前测平均分高出8.667分，而且后测的标准差小于前测，说明学生的整体水平有了提高；
The mean of post-test has improve by 8.6667 comparing to the pre-test, and the standard deviation of the post-test decreases, which implies students' average level improves.
后测的分数明显高于前测的分数，后测平均分比前测平均分高出8.667分，而且后测的标准差小于前测，说明学生的整体水平有了提高；
The mean of post-test has improve by 8.6667 comparing to the pre-test, and the standard deviation of the post-test decreases, which implies students' average level improves.
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