查询词典 periodic

In the second part, necessary and sufficient conditions are derived for complete reachability and observability of periodic time-varying descriptor systems.

在第二部分中，我们先针对周期奇异系统的完全可达性与完成可观性，给出一系列的充分必要条件。

With the present m ethod both the stability of the peri odic solutions and the asymptotic e xpressions for the periodic solutions ca n be obtained easily.

采用本文所提出的方法，无论是周期解的稳定性，还是渐近解都可以较容易地获得。

Estrus,also oestrus:The periodic state of sexual excitement in the female of most mammals

&动情，动情周期：大多数哺乳动物的雌性产生的周期性的性冲动，在此期间内雌性具有排卵的优势，所以该期间最适合性交；刺激&

The shorter duration and greater optionality require insurers to undertake more short-term trading and hedging of market risks, or to hold greater capital to address periodic investment underperformance.21 This shift in balance sheet and risk profile is particularly relevant to the current debate surrounding financial accounting and reporting standards.

期限的缩短和增大选择性都要求保险商们对各种市场风险进行更短期的交易和投资活动，或者拥有更多的资本，去解决周期性发生的投资状况不良问题。资产债务表和风险形象方面的转变，与当前围绕着财务会计和报表制度所进行的辩论有着特别的关联。

In order to guarantee safety and stability, and to minimize costs for repair and maintenance, it is desirable to make a suitable rule determining the range of out-of-round, and to detect、remove and repair the non-roundness wheels in time. The paper analyzes wheel ovalization, which is called the second order periodic non-roundness of wheels.

为保证此方面的行车安全和稳定，提高铁路运输维护维修的经济效益，需要制定合理的依据，确定车轮非圆化的允许范围，及时对非圆化车轮进行检测、更换和镟修。

A new mathematical model is put forward numerically to simulate the wheel ovalization.. In the numerical simulation, the dynamic model of a half railway vehicle coupled with a tangent track is employed. Using the new numerical method investigates vehicle-track coupling system dynamic responses including lateral and vertical displacement of wheelsets and the vehicle, lateral and vertical vibration acceleration of the track at different phase angle of the two side wheels of the same wheelset, which are compared with that of the traditional model. The numerical results show that the discipline and frequency of dynamic responses are accordant, amplitude and phase of lateral dynamic responses are different. It is concluded the traditional track geometric irregularity excitation model does not simulate the effect of periodic wheels ovalization on vehicle-track coupling system dynamic behavior truly, the new model is more accurate and reasonable.

本文研究了车轮二阶周期性非圆化—椭圆化，建立了一个新的模拟车轮椭圆化的数学模型，结合车辆－轨道空间耦合动力学模型，计算了同一轮对左右车轮不同相位和车轮椭圆度下轮对和车体的横、垂向位移，钢轨横、垂向振动加速度，并与传统模型计算结果作了对比，分析表明两种模型的动力响应变化规律和频率一致，但横向动力响应幅值和相位均存在不同程度不可忽略的差异，因此传统的轨道几何不平顺激励模型不能真实模拟车轮的周期性椭圆化对车辆－轨道耦合动态行为的影响，而本文模型更能反映实际椭圆车轮与钢轨接触情形，计算方法准确而合理。

This emphasizes contradictions within capital itself (which is viewed as a social relation involving the appropriation of surplus value) as giving rise to an inherently unbalanced dynamic of accumulation resulting in an overaccumulation of capital, culminating in periodic crises of devaluation of capital.

这突出矛盾资本本身（这被看作是一种社会关系，涉及的拨款剩余价值）为引起不平衡的内在动力，积累导致overaccumulation资本，最终导致周期性危机的货币贬值的资本。

The traditional transformer online monitoring system generally adopts oxygen carrier gas, chromatographic column. And the equipment is not simple with many shortages such as periodic calibration of chromatography column and sensor, low reliability of equipments and overelaborate detection procedure of gas composition.

由于变压器传统的在线监测系统一般采用色谱柱，需要消耗氧气和载气，而且色谱柱和传感器需定期标定，装置可靠性不高，检测气体成分过程繁琐，因此第6章根据比尔-朗伯特(Beer-Lambert)定律，按照光纤气体差分吸收的原理，设计了一套基于光纤气体传感器的变压器在线监测系统。

Objective:to explore the pathogenesy and the precaution of the hypokalemic periodic paralysis by summarizing the clinical situation and therapeutic effect.

目的：总结低钾性周期性麻痹的临床表现和疗效，探讨其发病机制及预防措施。

In chapter 2, we discussed the effect of this mechanism to both low and high altitude satellites In certain condition, eccentricity e may have long periodic variation with large amplitude and the pericentric distance decreases.

第二章即讨论了这种机制对高轨、低轨卫星的影响。

Well, I have to get going.

我不得不走了。

The fixed expansion points of the general shroud allow a better definition of local shock locations than on ogive type shrouds.

一般外壳的固定膨胀点能比蛋形外壳更好地限定局部激波的位置。