1) 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
2) weak focus with high order
高阶细焦点
3) arbitrary order weak focus
任意阶细焦点
4) 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。
5) 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。
6) strong(weak) focus
粗(细)焦点
补充资料:二氧化双环戊二烯B阶树脂模塑料
分子式:
CAS号:
性质:又称二氧化双环戊二烯B阶树脂模塑料。以二氧化双环戊二烯B阶树脂为基料配制的能采用模塑方法成型的配混料。产品性能为:弯曲强度110MPa,冲击强度5.4kJ/m2;马丁耐热240℃;体积电阻率1.3×1016Ω·cm,介电强度24.5MV/m。由二氧化双环戊二烯B阶树脂,用石英粉等作填料,再加脱模剂配混制得。可用模塑法制成耐热、耐候制品用于军工和民用方面。
CAS号:
性质:又称二氧化双环戊二烯B阶树脂模塑料。以二氧化双环戊二烯B阶树脂为基料配制的能采用模塑方法成型的配混料。产品性能为:弯曲强度110MPa,冲击强度5.4kJ/m2;马丁耐热240℃;体积电阻率1.3×1016Ω·cm,介电强度24.5MV/m。由二氧化双环戊二烯B阶树脂,用石英粉等作填料,再加脱模剂配混制得。可用模塑法制成耐热、耐候制品用于军工和民用方面。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
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