1) strong(weak) focus
粗(细)焦点
2) fine focus
细焦点
1.
This paper discusses the conditions of the quadratic systems (Ⅱ) δ=0 with second order fine focus.
讨论了二次系统（Ⅱ）δ＝０具有二阶细焦点的条件，并对ｎ＝０时以原点Ｏ（０，０）为二阶细焦点的二次系统（Ⅱ）δ＝０作了全局分析。
2.
In this paper we study a class of cubic systems with one finite singular point of third order and show that such a system can has two fine focus of order at most 2.
本文研究了一类具有一个三阶奇点和两个零特征根的三次系统,证明了这样的系统可以存在两个二阶细焦点,并给出了系统存在一阶细焦点、二阶细焦点和中心的条件。
3.
In this peper,the author discusses the quadratic systemfor which 0(0,0) is a first order fine focus (1 + a(b + 2l≠0.
研究二次系统 在其一阶细焦点Ｏ（０，０）附近极限环的不存在性。
3) weak focus
细焦点
1.
Finally the existence of the limit cycle is obtained by using the stability theory of the weak focus.
最后根据细焦点的稳定性判断出极限环的存在性。
2.
This paper studies transformations used for calculating saddle values and focus values, and obtains two classes of general transformation which change weak saddles into weak focuses.
通过对鞍点量和焦点量计算时常用的变换进行研究,得到了两类把细鞍点化为细焦点的一般变换,并利用其中的一类推导出了不含二次项的三次系统的鞍点量和可积条件。
3.
Conclusion The results showed that the system,=-y+δx+lx2+mxy+ny2,=x(1+ay-y2), exist two limit cycles and has at most one limit cycle surrounding weak focus.
y=x(1+ay-y2)可以存在2个极限环,该系统在细焦点外围至多有一个极限环。
4) weak focus of 2 order
二阶细焦点
1.
On quadratic differential system with a weak focus of 2 order;
关于具有二阶细焦点的二次系统
5) weak focus with high order
高阶细焦点
6) cut-off point of the coarse and fine aggregate
粗细集料分界点
补充资料：麤（粗）旦 细旦
见旦。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条