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Nf will repeat exactly after a time T = 1/f. The harmonic series is special because any combination of its vibrations produces a periodic or repeated vibration at the fundamental frequency f.

系列的谐音ㄈ长特别是因为在任何的组合下，其本身的震动产生了一个和基础频率f周期性且或重复性的震动。

Hase locked loops are electronic systems widely used in different fields of applications. Their main task is synchronizing an internal oscillator with an external periodic signal.

LL电子系统广泛的运用到不同的应用软件领域，他们的主要任务是同步内部振荡器和外部定期信号。

This theorem which is a constructive bridge between the deterministic and indeterministicphenomena shows that the periodic behavior of chaotic dynamical systems in probability spaces is the origin of their periodicityin Hausdorff metric spaces.

该定理成功地跨越了确定性现象和随机现象间的鸿沟，揭示了Hausdorff周期律和概率周期律间的依存关系，它表明混沌动力系统的Hausdorff周期律是其概率周期律的一种表象。

The mechanism of the periodic formation of hierarchic structures was also demonstrated.

通过结构因子的演化，讨论了二尺度相分离结构的形成机理，并且考察了相互作用参数的震荡幅度与体系特征尺度的关系。

Stationary motions of the system were determined and periodic motions near them are conustructed using the Liapounov theorem of the holomorphic integral.

确认系统运动是稳定的，并通过Liapunov全纯积分定理，构建其近似的周期运动。

It is found that the feasible time-varying route flows is a irreducible non-periodic homogeneous Markov process in the M-multiple traffic state space and deal with the alongrithm of the stable distribution and average value introduced.

由于动态用户选择行为受到路网需求、网络结构、交通状态信息、个体经验和心理差异等多种因素的影响，在这种不断变化的交通环境和不完备情报的条件下，由用户选择行为导致的交通状态演变，本质上是一随机过程。

During the plate vibrationcourse , angular point generate the homologize periodic change counterforce .

在板振动过程中，柱支角点要产生相应周期变化支反力。

By using the continuation theorem of coincidence degree theory, homotopy invariance property and Lyapunov's approach, some sufficient conditions ensuring the existence and stability of positive periodic solutions of the system are obtained.

利用Mawhin重合度理论，并结合同伦不变性质，以及Lyapunov方法，获得该系统正周期解的存在性和全局稳定性的充分条件，推广和改进最近一些文献的结果。

Citric acid production with cellulase hydrolyte of wheat stalk by Aspergillus niger , the effects of media component, fermentation at constant temperature, and at periodic variable temperature on citric acid were studied.

以麦草纤维素酶解液为原料，用黑曲霉发酵制备柠檬酸，研究了培养基组成、恒温发酵和周期变温发酵对柠檬酸发酵的影响，结果表明，适宜的培养基组成为NH4 NO3 0 。3%，KH2 PO4 0 。1%，Mg2 + 30 0× 10 -6，Fe2 + 10×10 -6，此时，柠檬酸产量为 10 。5 2 g/L ，糖转化率为 6 0 。80 %。

In this paper, we consider neutral functional differential equations and study the global existence of their solutions, stable subspaces and unstable subspaces of linear autonomous dynamical systems, local stable manifolds and local unstable manifolds of near hyperbolic equilibrium point of nonlinear autonomous dynamical systems, periodic solutions and oscillation of the neutral equations.

本文主要研究中立型泛函微分方程解的整体存在性，自治线性动力系统的稳定子空间与不稳定子空间、自治非线性动力系统在双曲平衡点的局部稳定流与局部不稳定流，周期解与解的振动性。

The reasons of iron ions content overproof in grade Ⅱ desalting water system,such as variation water quality,contamination of regenerant , operation adjustment of pretreatment system and switching operation of bed were discussed.

对二级脱盐水系统中铁离子含量超标的原因，如来水水质发生波动、再生剂受到污染、预处理系统操作调整、床体运行切换等进行了论述。

You were hired to drum up new business, so go and do it.

公司雇你招徕新业务，你就做你的事好了。