查询词典 periodic

As applications of our results,in section 3.3,we investigate the existence of periodic solutions and golbal exponential stability of some classes of impulsive cellular neural networks with time delays.

第四章首先使用Krasnoselskill锥不动点定理研究了一类一阶奇异脉冲泛函微分方程的周期边值问题，得到了这类奇异边值问题正解存在性的充分条件，我们的结果允许右端函数f中关于u是奇异的。

Detection of a periodic signal hidden in noise is frequently a goal in superconducting gravimeter.

1引言探测时间序列中隐含的周期信号是超导重力仪观测数据分析的目标之一，一般需对观测数据进行频谱分析。

Unfortunately, the graviton has never ever been detected; it is as previously indicated a 'mythical' particle that fills the mind of the theorist with dreams of golden Nobel Prizes and perhaps his or her name on the periodic table of elements.

不幸的是，以往从来没有发现引力；被疑是『神话』粒子心中的激动与梦想黄金诺贝尔文学理论家奖品和他或她的名字或许就元素周期表。

A great deal of achievement has been obtained duing periodic inspection of the three hydropower stations of Dashankou,Tiemenguan and Tuohai in Xinjiang,including to make the status of dam safety clear,to promote dam re habilitation,to perfect the archives of dam safety and to cultivate a group of dam safety management technians.

新疆大山口、铁门关、托海三座水电站，经过定期检查，摸清大坝安全现状，促进大坝维修加固，完善大坝安全档案，培养出一批大坝安全管理技术人员，取得一系列明显成效。

The growth of hair follicle is determined by periodic proliferation and differentiation of stem cells.

毛囊是一个周期性自我更新的皮肤附属器，干细胞周期性的增殖和分化决定毛囊的生长特性。

A Novel Method for Harmonic Analysis of Periodic Signals.

周期信号谐波分析的一种新方法。

The curve of third harmonic sound pressure level(SPL3)is alsoa "periodic function".The period length is about"first resonancefrequency" of the tube Δf=f0=c0/(2L).The magnitude of SPL3 canbe predicted by Coppens theory(with one of the parameters modified).

三次谐波声压级变化曲线为一"准周期"函数，周期长度为驻波管的第一共振频率值Δf＝f0＝C0/2L，用Coppens所推导的"共振"时公式，计算三次谐波共振峰的量值，表明仍存在差异，只有经过参数修正才能所得结果。

In this dissertation, digital lock-in detection techniques under integer period sampling and non-integer period sampling are separately investigated (1) Under integer period sampling, digital signal sequence is acquired through sampling the measured signal, but digital reference sequence is acquired through mathematical operation, then digital lock-in detection can be realized by calculating crosscorrelation function of digital signal sequence and digital reference sequence Harmonic measure is also analyzed, and a method of measuring harmonic of a periodic signal under aliasing is put forward.

本文对使用采样ADC把模拟信号转换为数字信号并通过计算数字信号的相关函数来实现锁定检测的技术进行了研究，在此基础上设计了一个多功能的数字LIA并在一些科学实验中进行了应用。本文对整周期采样和非整周期采样时的数字锁定检测技术分别进行了研究。(1)在整周期采样时，对被测信号进行采样得到信号序列，而参考序列由数学运算得到，通过计算信号序列和参考序列的互相关函数就可实现锁定检测。

The famous Frenkel-Kontorova model describes the motion of a harmonic chain in a periodic potential field, and it is one of the simplest models in describing the spatial competition.

著名的Frenkel-Kontorova模型描述的是一条最近邻相互作用的原子链在周期势场中的情况，是最简单的描写尺度竞争的多体系统之一。

Based on this system, harmonic and subharmonic periodic response of S-LF subjected to harmonic motion is investigated by using Floquet theory.

并给出了这种结构的最大滑动位移响应随滑移面摩擦系数的变化曲线，可供设计时参考。

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。