查询词典 periodic

These compounds pair one or more elements from the third column of the periodic table( such as aluminum, gallium or indium) with an element from the fifth column( typically phosphate, arsenic or antimony).

这些化合物将周期表第三栏里的一种或多种元素第五栏里的一种元素在一起。

Tumbling flow is appeared in this fishway which produces wave surge and continues to flow downward and may causes serious damage due to its behaviour of periodic tumbling action.

在这种鱼道中出现的滚动流将产生波涌，并继续向下传播，而且它的周期性滚动可能会严重危害鱼道。

In this paper, the almost periodic solution for a class of two-degree-of-freedom nonlinear oscillating systems is studied by using the Leray-Schauder fixed point theorem and the method of Liapunov function.

运用Leray-Schauder不动点定理和Liapunov函数方法，研究了一类两自由度非线性振动系统的概周期解，得到了该振动系统概周期解存在的充分条件。

Bounded ; solutions ; Almost periodic sofutions ; Fixed point method

有界解；概周期解；不动点方法

Chapter two mainly considers the periodic boundary value problems for impul-sive differential equations. Some existence results, obtained by the help of Schaeffers fixed point theorem and the method of upper and lower solutions coupled with the monotone iterative technique.

第二章讨论了两类周期边值问题，通过利用Schaeffer不动点定理，上下解方法和单调迭代方法，建立了解存在的充分条件。

The sufficient conditions for guaranteeing the permanence of the system and the existence and uniqueness of periodic solution having globally asymptotical stability are obtained by using the extremum principle,fixed point theorem and V function method s together.

讨论一类具 Holling 类功能反应和放养的捕食链非自治扩散系统，应用极值原理和不动点定理及 V函数法，得到该系统的一致持久性以及存在唯一全局渐近稳定周期解的充分条件。

To our knowledge, this is the first work for the existence of periodic solutions for neutral systems by generalized Schaefer fixed point theorem of seperate contraction mapping.

第四章，讨论了两类依赖于参数的泛函微分系统，用锥上的Deimling不动点定理，证明了系统的正周期解的个数与参数的取值以及非线性项的渐近行为有关。

Some sufficient conditions for the existence and multiplicity solutions of positive periodic solutions were obtained by using the fixed point theorem .

讨论一类具分布时滞的微分方程正周期解问题，利用锥不动点定理，获得了这类问题正解存在性和多重性的充分条件，推广和改进了已有文献的相关结果。

Periodic Table Flash Cards is designed to help you learn the elements.

元素周期表闪存卡的设计，能帮助您了解的内容。

Physicochemical property analysis and ferrography analysis are used to monitor the variation of evaluation indexes of engine oil such as viscosity, acid value, water content, flashing point, ignition point, severity of wear index and number of large abrasion particles, and the degradation of engine oil was analyzed. Using grey relational analysis, the relational degree and the relational order between mileages and evaluation indexes are determined and provide the basis for periodic oil-change and selection of monitoring indexes.

应用理化分析和铁谱分析方法，监测汽车发动机润滑油粘度、酸值、水分、闪点、燃点以及磨损烈度指数和大磨粒数等评价指标的变化，研究了汽油机油衰变规律；通过灰色关联分析，确定了汽车行驶里程与发动机油液监测指标间的关联度和关联序，为油液监测下的定期换油和监测指标的筛选提供依据。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。