Third , controlling chaos in the chaotic n - scroll chua ' s circuit is studied . the approach taken is to use feedback of a single state variable in a simple pd ( proportional and differential ) format . first , the unstable fixed points in the n - scroll chua ' s circuit are classified into two different types according to the characteristics of the eigenvalues of the linearized system matrix at the fixed points 第三，研究了多涡卷chua电路中不动点处jacobian矩阵特征根的性质，并据此将不动点分成两类，应用变量的比例微分反馈法分别对这两类不动点的可控性进行了研究，研究发现该法只能实现第一类不动点及其相应子空间的混沌控制，而不能完成第二类不动点的混沌控制，并给出了数值模拟结果,理论分析和数值模拟证实了该方法的有效性。
One is about the developing ability of destination and object people , it includes theory of circle cumulate cause and effect , etc ; the other one is about how to protect the rights of poor people , etc . based on the induce and deduce work for the theories of antipoverty , the author made a demonstrated research of tourism antipoverty and take the depressed areas , the western part of yingde city ( yingxi ) and lianan county , as the cases 按照这些理论在旅游扶贫中的功能与作用，可将其分成两类：一类是研究扶贫目的地和贫困人口的发展能力的理论，包括循环累积因果理论等；另一类是研究保障贫困人口权益的理论，包括收入分配理论等。在对旅游扶贫理论进行归纳和演绎的基础上，作者对贫困山区英西、连南两地的旅游扶贫进行了实证分析。
