查询词典 impulsive force

On the basis of analyzing and summarizing the work of modern epidemic research, considering the impulsive vaccination this article constructs models with the form of impulsive differential equations.

在分析和总结当代流行病研究的基础上，本文考虑了实施脉冲疫苗策略对其的作用和影响，建立了脉冲微分方程形式的流行病传播数学模型。

Firstly, the equation for stress intensity factors under static uniform pressure is used as the reference case, and then the weight function for a thick-walled cylinder containing a radial edge crack can be worked out. Secondly, the dynamic stresses in uncracked thick-walled cylinders are solved under internal impulsive pressure by using mode shape function method. The solution consists of a quasi-static solution satisfying inhomogeneous boundary conditions and a dynamic solution satisfying homogeneous boundary conditions, and the history and distribution of dynamic stresses in thick-walled cylinders are derived in terms of Fourier–Bessel series. Finally, the dynamic stress intensity factor equations for thick-walled cylinder containing a radial edge crack subjected to internal impulsive pressure are given by dynamic weight function method.

首先采用静态内压下的应力强度因子作为参考解，得到了带径向边裂纹厚壁圆筒的权函数；然后用振型函数方法推导无裂纹厚壁圆筒在冲击内压下的动应力响应，分析中将相应的弹性动力学方程解分为满足非齐次边界条件的准静态解和满足齐次边界条件的动态解的叠加，利用傅立叶-贝塞尔级数展开，推导出了厚壁圆筒内动应力的响应历程和分布规律；最后由动应力权函数方法导出带径向边裂纹厚壁筒在冲击内压下的动态应力强度因子计算公式。

We consider the existence of positive solutions of second order impulsive boundary value problems by constructing the appropriate homotopy operator and applying the theory of fixed point index in cones. our results contain the conclusion when f ≥ 0 and J_k = 0([6]). Secondly, we discuss multiple positive solutions of the following impulsive boundary

其次，我们在§2.2中讨论了下面的脉冲微分边值问题多正解的存在性在这一部分的讨论中，利用不动点指数理论，在f既非超线性又非次线性的情形下，得到了两个正解的存在性定理，把文[7]的结果推广到脉冲微分边值

In chapter 4, we first discussed the existence of multiple positive solutions of the second order nonsingular Dirichlet boundary value problem for impulsive differential equations by using the fixed point index theorem in cones . Next, we presented some new existence results for singular boundary value problems for second order impulsive differential equations by using fixed point theorem in cones and Leray-Schauder nonlinear alternative theorem.

第四章我们首先利用锥不动点定理讨论了非奇异二阶脉冲微分方程狄利克莱边值问题多个正解的存在性；其次我们用锥不动点定理和Leray-Schauder型非线性抉择定理，讨论了奇异二阶脉冲微分方程狄利克莱边值问题一个及多个正解的存在性。

By solving theintegral inequality without impulses on each interval between two adjacent impulsive points, the solution of impulsive integral inequality is obtained step by step.

讨论了一个一般的脉冲积分不等式，利用两个邻近脉冲点间每个小区间上无脉冲积分不等式的解，一步步导出了脉冲积分不等式的解。

By solving the interval inequality without impulses on each interval between two adjacent impulsive points, the solution of impulsive integral inequality is obtained step by step.

讨论了一个一般的脉冲积分不等式，利用两个邻近脉冲点间每个小区闭上无脉冲积分不等式的解，一步步导出了脉冲积分不等式的解。

Through creating a differential equation whose oscillation is equivalent to the impulsive equation, or considering the relation between impulsive points and delay, we get some sufficient conditions for the oscillation of the equation.

第二章讨论了二阶自共轭脉冲微分方程，通过建立与之振动性等价的微分方程，或考虑脉冲点与时滞间的关系，我们得出方程振动的一些充分条件。

This paper is composed of three chapters, which respectively discusses the following impulsive delay difference equations with discrete variables and continuous variables:In chapter 1, we investigate the oscillation and nonoscillation of equation and some sufficient conditions for oscillation and nonoscillation are obtained. Consequently we extend these results to the difference equations with several delays and with nonlinear impulsive perturbations and with variable delays respectively.

本篇论文由三章组成，分别讨论下面四类具离散变量和连续变量的脉冲差分方程这里p≥0，Q＞0，当n∈N(0)时；p∈C(-1，∞)，R~+，Q∈C

This thesis is concerned with the existence of solutions of semilinear evolution impulsive equations as well as the existence of positive solutions of them. And the existence of solutions for terminal problems of impulsive differential equations is also concerned in this thesis.

本文主要研究半线性发展脉冲微分方程解和正解的存在性，以及脉冲微分方程终值问题解的存在性。

Excced high molecular weight polyvinyl(English curtaiment UHMW-PE)be thermoplastic engineering plastics it integrative all plastics's high-performance,but endure impulsive,anti-abrasive,endure chemistry eat away,oleiferous inhouse,absorb impulsive energy this 5 piece behavioural is now deposit that is among plastics all tiptop numerical value,already become 1 piece eye – catching complete new type turn-out .among Young city unctuous substance factory at country at country the department concend's energetically support below successfully trituration produce come out this turn-out And domestic get far-reaching application.

超高分子量聚乙烯(英文缩写UHMW-PE)是热塑料。它综合了所有塑料的优越性能，而耐冲击，耐磨性，耐化学腐蚀，自身润滑，吸收冲击能这五个特性乃是目前即存塑料中所有的最高数值。已成为一种引人注目的完全新型的产品，扬中市富朗橡塑有限公司在国家有关部门的大力支接下成功地研制生产出该产品，并在国内得到广泛的应用。

The system can be widely used in belt weighing and batching process control,etc.

介绍了基于智能模糊控制的嵌入式配料系统的设计方法，对模糊PID控制过程和系统调零作了重点的讨论，同时给出了PID控制的程序流程图和系统定长调零子程序。

"I dunno," she answered,"but if you show me aroun', I'll recognize it from the lighthouse just outside the porthole."

"我不知道，"她回答说，"如果你能带我转转，我能认出来的，因为灯塔就在舷窗外。"