浅谈猪口蹄疫的防制     

罗明伟 《农机具之友》2014,(3):147-148

养猪业是农村养殖的传统产业,是广大农民增收的主要途径之一,猪口蹄疫一年四季均可发生,在生产实践中如何防控猪口蹄疫,已成为广大畜牧工作者和广大养殖户面临的难题。本文从猪口蹄疫的致病机理、流行特点、临床症状、预防措施等方面作了阐述,仅供广大畜牧工作者和养殖户参考。  相似文献   

一个新非自治超混沌四维二次系统及其电路实现     

罗小华  李元彬  罗明伟  李锐  李华清 《西南大学学报》2009,31(7)

在三维二次混沌系统的基础上增加一个含控制信号的状态变量,组成一个新的非自治超混沌四维二次系统.该系统的基本动力学特性的变化主要依赖于控制信号频率的改变.通过系统的Lyapunov指数谱、分岔图及数值仿真表明,在不同的频率参数下,该系统能够体现周期、拟周期、混沌、超混沌的动力学特性.最后设计了一个模拟电路,进一步验证了其特性.

Abstract：

Based on the three-dimensional quadratic chaos system, this paper constructs a new four-dimensional quadratic non-autonomous hyperchaos system by adding a state variable with the controlling signal.The change in the basic dynamics characters of this system is mainly realized by varying the frequency of the controlling signal. The different chaos dynamics characters of this system such as periodicity, quasi periodicity, chaos and hyperchaos at different frequencies is shown by Lyapunov spectrum , bifurcation diagram and numerical simulation. The results of the experiment are further shown to be consistent with the numerical simulation by designing an analog electronic circuit.  相似文献