研究结果表明：三阶色散所致啁啾是非线性的，存在极值，极值点在脉冲中心附近，并且与入射高斯脉冲的初始啁啾有关。
The results show that chirp is nonlinear and has extreme value near the center of the pulse and depends on the initial chirp.
数值模拟发现，在脉冲传输距离与扰动周期长度的关系中存在着一种多极值结构。
We numerically show that there are many extremums in dependence of the propagation distance on the period lengths of perturbation.
本文给出一类多元函数—三元函数是否存在极值的快速判别方法，并讨论它在实际问题中的应用。
In this paper, a convenient judgement method about extreme value of one class multivariate functions-trivariate functions was given, and its application in reality was discussed.
先给出这些问题的提法，然后使用列紧性原理和极值原理证明了上述二阶椭圆型方程边值解的存在性和唯一性。
Fristly the boundary value problems for the equations is formulated, and then by using the compactness principle, the existence of solutions for the above problems is proved.
同时，还导出了最大推力喷管这个泛函极值问题解存在的条件。
The condition of the existence of solution of functional extreme value problem applied to maximum thrust nozzle is also presented.
黏聚力形成的阻抗强度因子数值，与黏聚裂纹长度和材料极值拉伸应力存在数量关系。
The stress intensity factor of crack solids is a fracture mechanics index that denotes the effect of loading and crack geometry.
最大膛压点的确定是内弹道零维模型求解的一个重要环节，传统的优选方法存在着可能陷入局部极值点的问题。
Determination of the bore maxi-pressure point is an important link in solution of internal ballistics zero dimension model. Traditional optimizing methods probably have some problems of local pole.
目前对传热效果的评价存在熵产最小化和势容耗散取得极值两种不同的准测。
At present, entropy generation minimization and potential capacity dissipation extremum are the two principles to value heat transfer performance.
粒子群优化算法应用于多极值点函数优化时，存在陷入局部极小点和搜寻效率低的问题。
Particle Swarm optimization (PSO) algorithm is a population-based global optimization algorithm, but it is easy to be trapped into local minima in optimizing multimodal function.
在分析经验模式分解存在问题的基础上，改进了经验模式分解的算法，提出用窗口平均法取代原极值包络法来计算局部均值。
Based on the analysis of some problems in the method of empirical mode decomposition, the algorithm of empirical mode decomposition is improved in this paper.
引入横向换热管后，混合间延长，且表观气速的影响范围变大，表观气速对混合时间的影响不是单调关系，存在极值点。
Mixing time was prolonged and the effect of Ug extended in a larger range and showed extremum points when cross heat exchange tube was introduced.
通过利用泰勒公式推导出判断三元函数极值存在的充分条件和极值不存在的必要条件。
By using Taylor's formula, the article deduces the sufficient condition of the existent extreme value and the necessary condition of the inexistent extreme value of trinary function.
在论述了经验模式分解（EMD）信号分解原理的基础上，分析了其存在的边缘效应，并提出了通过添加极值点抑制边缘效应的思路和策略。
The end effects of empirical mode decomposition (EMD) are discussed and the end effects are restrained by the method. The results of EMD in both signals are analyzed by three ways.
在论述了经验模式分解（EMD）信号分解原理的基础上，分析了其存在的边缘效应，并提出了通过添加极值点抑制边缘效应的思路和策略。
The end effects of empirical mode decomposition (EMD) are discussed and the end effects are restrained by the method. The results of EMD in both signals are analyzed by three ways.
应用推荐