七自由度冗余机械臂的阻抗控制，并实现自动对奇异构型的避免，通过设置性能指标，自动对机械臂此时性能指标的变化进行判断并修正机械臂轨迹(The impedance control of the seven degree of freedom redundant manipulator is realized, and the automatic configuration is avoided. By setting the performance index, the change of the

非常好的关于Bp神经网络的资料，有介绍，有代码实现，简明易懂，注释到位(very good codes for bp net work, with introduction and well worked codes ,and proper explanation included)

These composite materials generally exhibit brittle damage behavior. The anisotropy in the material and different kinds of failure mechanisms make it difficult to accurately characterize the behavior of composite materials. The present work aims to