查询词典 periodic

There were obvious seasonal and periodic features in rubella incidence.

有明显的季节性和周期性。

Methods Driving PZT by adding white noise of various level to periodic signals(f=100 Hz), the directly mechanical stimuli was give to the five sacculus submerged in a solution containing perilymph-like, and the afferent activity the 8th nerve was recorded.

在周期性信号（频率为100Hz上加不同强度的白噪声电信号，驱动压电陶瓷，对5只浸入在外淋巴液中的牛蛙球囊直接使用该机械刺激，并记录第八对颅神经的球囊末梢的传入活动。

Low speed principle of closed - loop system , it can be concluded that the existence of the difference between static frictional and dynamic frictional torque , and the periodic saltation of the dynamic frictional torque , are the main reasons of the low speed stick - skip to the electrohydraulic position servo system

针对伺服马达的低速性能，进行了低速实验研究，并兼顾快速性能进行了阶跃响应和正弦响应实验研究，对实验结果进行了分析，得出了一些有价值的结论，提出下一阶段进行实验的建议。

The vibro-impact systems are familiar with the non-smooth dynamic systems.The dynamics research of the vibro-impact systems not only is significant in theory but also has practical values in engineering.Firstly,using the Poincaré map method,we get an existent criterion of single impact period-n motion in a two-degree-of-freedom vibro-impact system with damper.It is shown that our conclusions are valid through the numerical simulations.Moreover,the satiability of periodic motions is studied and the correspon...

基于Poincaré映射的方法，通过解析的方法导出了一类具有阻尼的两自由度碰撞振动系统的单碰周期n次谐运动存在性判据，经过数值模拟验证了理论分析的正确性，并给出了分析其稳定性的判别公式，通过数值模拟，讨论系统的局部分岔与全局分岔，同时比较了系统参数变化对其周期运动的影响，发现在强阻尼、弱激励、小质量比、较大恢复系数下系统将会出现较多的有规律的周期碰撞。

To study the surface hydrophobicity of solid materials with the lattice Boltzmann method , the rough surface is approximately treated with simple periodic rectangular, saw-toothed and semicircular protrusions structure respectively. A two-phase lattice Boltzmann model is used to simulate the changes of surface hydrophobicity by calculating the contact angles of a droplet on rough surfaces.

将固体表面分别近似为具有简单的周期性矩形、三角形和半圆形微粗糙结构表面，建立两相流的晶格玻尔兹曼模型，通过测量不同微粗糙结构表面上液滴的接触角，探讨微结构形状和尺寸的改变对固体材料表面疏水性能的影响。

Objective To compare the diagnostic effect of ScAg assay,collective egg incubation and Kato-Katz methods so as to provide effective diagnostic method after periodic mass treatment.

目的观察比较血吸虫循环抗原与病原学诊断方法的应用效果，为经过周期性群体化疗后的血防工作提供有价值的诊断方法。

The existence of solution is studied for a class of second - order periodic boundary value problems with first applying Leray - Schauder fixed point theorem, two exislence theorems are established.

考察了一类非线性项含有一阶导数的二阶周期边值问题的解的存在性，其中非线性项是Carathèodory函数。通过构造非线性项的高度函数并且利用Leray-Schauder不动点定理建立了两个存在定理。

Part of these policies involves periodic health screenings for existing employees to constantly monitor their health.

公司政策包括了对在职员工的定期体检以监测员工的身体健康状况。

This can be done by periodic quizzes which are designed to show students what they know, rather than what they don't (hence the term quiz rather than test) and by self-check lists of what students feel that they have learned at various stages through the book.

这可以通过定期测验来了解学生掌握了多少，而不是他们所不知道的和通过这本书所学到不同等级的知识的自我检测签单。

The dissertation studies the phenomena and characteristics of self-excitation, deduces those phenomena belong to nonlinear non-conservative autonomous steady-state periodic movement.

本文分析研究了轧机主传动系统自激振动的现象和特点，得出轧机主传动系统的自激振动现象属于非线性非保守自治系统的稳态周期运动。

No clear conclusions can be made about the predictie alidity of specific measures, they found, except for criteria for the underuse of drugs for cardioascular disease.

除了心血管病不合理用药标准外，对于特定评价方法的预测效度没有明确的结论。

The third and last is that almost all of them, being infinite in number, have been impostures, and by idle and crafty brains merely contrived and feigned after the event past.

第三、即最后一点是：几乎所有这些不胜枚举的预言都是欺人之谈，都是在事件过后由无聊而狡猾的脑筋推测与凭空捏造的。