A class of quartic system,which is an accompany system of a quadratic differential one,is studied in this paper.
证明了它至多有一个极限环,并得到了奇点的性态和拓扑结构,把相伴系统的极限环的唯一性推广到了四次系统。
The article introduce the concept of accompany system of plane polynomial differential system, and study the similarities and differences about nonexistence, uniqueness of limit cycle and decision the centre or focus between the polynomial system and it′s accompany system.
引进平面多项式系统的相伴系统的概念 ,分析了多项式系统与其相伴系统之间在极限环不存在性 ,唯一性 ,中心焦点的判定等问题上的相似之处和不同之处 ,提出了几个公开问题 。
It is important in ASAC system based on acoustic radiation modes to obtain adjoint coefficient of the radiation modes.
基于声辐射模态理论进行ASAC控制系统中的一个重要内容就是获得声辐射模态伴随系数。
A new piezoelectric sensor strategy is presented to measure the adjoint coefficients of the first 2 radiation modes.
提出了一种新的聚偏氟乙烯(PVDF)压电传感器的设计方法测量板的前2阶声辐射模态伴随系数。