However, the GM (1, 1) Model requires high stationary of the original data and concave data lines trend which has big gray plane.
但是，GM(1,1)模型对于原始数列的平稳性要求较高、数列连线趋势只能为内凹型、灰平面较大。
2
The present study numerically investigated a conceptual type of internal steam cooling vane with the impingement cooling technology on the basis of plane model and concave model.
The differences of the passive mode-locking by the SESAM in the plane-concave stable resonator and the plane-convex unstable resonator lasers were experimentally compared and reasonably explained.