Based on the usually used stability theory for the normal steel structure , the non - stability are divided into three sorts according to the performance after instability , as the balance fork instability , jump instability and extreme point instability 根据一般钢结构应用的稳定理论，常按屈曲后性能将失稳分为以下三类：平衡分岔失稳、跃越失稳和极值点失稳。
And comparing with the standard simulated annealing algorithm and genetic algorithm , this algorithm has rapider converge speed and the strong global optimize performance of divorcing from local extreme point and avoiding converging too early 且理论上可以证明其相对于标准模拟退火算法、遗传算法有更快的收敛速度及很强的脱离局部极值点和避免过早收敛的全局优化能力。
Because the weight space formed by the bp neural network ' s global error function , which include extreme point , is a hyper - surface , considering the initial parameters of bp neural network ' s structure , so the bp neural network has a inherent deficiency of easily falling into local minimum 由于bp神经网络的全局误差函数构成的权值空间是包含多个极值点的超曲面，加之即网络训练开始网络结构参数是随机给定的，因而bp神经网络在学习训练中容易陷入局部极小。
And the parameter data and the figures have not been calculated ever . compared with the performance curves of the primary aod , the aod with the optimum design shows great capacity : at the extreme point of bragg diffration the optimized one obtain a 2 . 4 times wilder relative 3db bragg bandwidth than the primary one ; and with the same relative 3db bragg bandwidth which is 0 . 67 , the optimized aod has a relative 2 times of the the primary aod 用图示的方法将优化设计后的曲线与非跟踪的曲线进行对比,在进入布拉格衍射区的临界点处经优化设计的器件相对带宽达到非跟踪器件的相对带宽的2 . 4倍;在相对带宽? f = 0 . 67的情况下,经优化设计的器件相对长度是非跟踪器件相对长度的2倍。
When the princess went in , prince vassily was sitting with one leg crossed high over the other , and a snuff - box in his hand . there was a smile of emotion on his face , and he looked as though moved to such an extreme point that he could but regret and smile at his own sensibility 公爵小姐玛丽亚走进屋里来的时候，瓦西里公爵脸上流露着深受感动的微笑，坐在那里，高高地架起一条腿，手中拿着鼻烟壶，好像他深深地动了感情，好像他对自己的多愁善感表示遗憾，付之一笑。
