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1)  the non-autonomous second order systems
非自制二阶系统
1.
Existence of periodic solutions is obtained by using the max-min methods on the non-autonomous second order systems under the conditions of liner-growth.
将极大极小方法应用于非自制二阶系统上,在其满足线性增长条件下,通过证明系统满足(p。
2)  non-autonomous second order systems
非自治二阶系统
1.
This paper studies the existence of periodic solutions for some non-autonomous second order systems.
研究一类非自治二阶系统周期解的存在性问题。
3)  second order nonautonomous system
二阶非自治系统
1.
In this paper,we considered the existence and uniqueness of almost periodic solution to a class of second order nonautonomous system,also gave that only if a 1>0,a 2k+1 ≥0, x¨ +R(∑nk=0a 2k+1 x 2k+1 )′ x· +1L∑nk=0a 2k+1 x 2k+1 =Ae(t),(e(t) is an almost periodic function in some conditions) exists almost periodic oscillations,the results in [1-3] are extended and improved.
该文讨论了一类二阶非自治系统x¨ +RF′(x) x· + 1LF(x) =Ae(t)在一定条件下概周期解的存在唯一性 ,并得到了仅当a1 >0 ,a2k+ 1 ≥ 0时 ,x¨ +R(∑nk =0a2k+ 1 x2k+ 1 )′x· + 1L ∑nk =0a2k+ 1 x2k+ 1 =Ae(t) (R >0 ,L>0 ,A>0 ,e(t)为一定条件下的概周期函数 )存在概周期振荡 ,推广和改进了文 [1- 3]中的结果。
4)  second-order system
二阶系统<自>
5)  second_order nonholonomic system
二阶非完整系统
6)  second order nonlinear system
二阶非线性系统
1.
The present paper deals with the controllability of the second order nonlinear systems with three point boundary values.
研究一类二阶非线性系统三点边值问题的可控性 。
补充资料:二种非器──闻经二种非器
【二种非器──闻经二种非器】
  ﹝出华严经疏﹞
  [一、二乘非器],谓佛说华严经时,一切二乘根器狭劣,不能听闻。故出现品云:一切二乘,不闻此经,何况受持,故虽在座,如聋如瞽;是名二乘非器。(二乘者,声闻乘、缘觉乘也。)
  [二、众生非器],谓一切邪见众生,无信心故,非其根器,虽闻此经,闻即生谤,而堕恶道,是名众生非器。
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