1) generalized Duffing-type equations
广义Duffing型方程
1.
By using the coincidence degree theory,we study a kind of generalized Duffing-type equations.
研究了一类时滞依赖状态下的广义Duffing型方程周期解的存在性,利用重合度理论得到了方程存在周期解的充分条件和必要条件,所得结果丰富和发展了现有文献的结论。
2) generalized Duffing equation
广义Duffing方程
1.
Using the Lipschitz selection theorem,we proved that the generalized Duffing equation has infinity periodic solutions under certain conditions.
利用Lipschitz选择定理,给出了广义Duffing方程存在无穷多周期解的充分条件。
3) duffing equation
duffing型方程
1.
Periodic solutions to a type of Duffing equation with complex deviating argument;
一类具复杂偏差变元的Duffing型方程的周期解
2.
This paper investigates the Duffing equation ■+f(x(t))+g(x(t-τ))=p(t).
本文考虑Duffing型方程■+f(x(t))+g(x(t-τ))=p(t),利用分析的技巧和非紧性测度的k-集压缩定理,得到了此方程至少存在一个T周期解的充分判据。
3.
In this paper,we use the coincidence degree theory to get new results on the existence and uniqueness of T-periodic solutions for a kind of Duffing equation with two deviating arguments of the formx″+g_1(t,x(t-τ_1(t)))+g_2(t,x(t-τ_2(t)))=p(t).
利用重合度理论研究了一类具有两个偏差变元的Duffing型方程x″+g1(t,x(t-1τ(t)))+g2(t,x(t-2τ(t)))=p(t)。
5) duffing equation
高阶Duffing型方程
6) Duffing equation
Duffing方程
1.
Study on frequency solution of nonlinear Duffing equation;
非线性Duffing方程自由振动频率解分析
2.
Research on self-synchronization and different structure synchronization based on the Henon system and the Duffing equation;
基于Henon系统和Duffing方程自同步与异结构同步的研究
3.
Exact solution of Duffing equation with hardening restoring force;
渐硬恢复力型Duffing方程的精确解法
补充资料：广义
范围较宽的定义（跟‘狭义’相对）：～的杂文也可以包括小品文在内。
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