定时器

Secondly, based on the FO estimate, we formulate the timing error and channel estimation as a problem of composite hypothesis testing according to the first signal model, and then solve the problem by the composite hypothesis testing approaches.

该估计方法包括两步：第一步是根据第二个系统模型，推导了一种有效的最大似然频偏估计器；第二步是根据所获得的频偏估计值，利用第一个系统模型，将定时误差和信道估计表示成一个复合假设检验问题，然后再利用复合假设检验方法进行定时误差和信道估计。

Due to the complexity of the cell jitter, the NonSynchronous Tining Recovery methods are currently not mature With the emphasis being given to the Class A CBR traffic, this paper analyzes the performance of the queueing delay and cell jitter at the source node and intermediate nodes, and discusses the Source Timing Recovery at the destination node in ATM networks Firstly, this paper presents a description of the cell jitter of CBR traffic, and gives the definitions of two kinds of cell jitter regarding the Source Timing Recovery for CBR traffic Then, by using exact mathematical models and analysis methods, this paper analyzes the impact of the factors, such as the capacity of the queueing buffer, the randomness, the deterministic nature and the correlation in cell arrivals of the background traffic sources, on the queueing delay and cell jitter performance of the CBR traffic through Statistical Multiplexitng To obtain an insight into the power spectral distribution and look for better schemes for the depression and filtering of the cell jitter, within the analyses we succeed deriving the power spectrum of the cell jitter for CBR traffic Hence, not only the power spectral distribution of the cell jitter can in the frequency domain be qualitatively understood, but also can the rms (root-meansquare) value of the cell jitter be quantitatively obtained so as to more accurately measure the amplitude of the jitter In the end-to-end performance analysis of the queueing delay and cell jitter, we propose a kind of quasi-periodic cell stream model to characterize the jittered CBR traffic, and present an initial queueing analysis of the CBR traffic following such a model at a generic intermediate node Additionally, we briefly discuss the buildout/playout and Source Timing Recovery functions of the destination node Finally, regarding the Source Timing Recovery of CBR traffic, this paper systematically discusses several important principles of the cell jitter filtering and depression reported in the literature, introduces several implementation schemes of the Source Timing Recovery e.

由于信元抖动的复杂性，非同步定时恢复方法目前还很不成熟。本文针对A类CBR业务流在ATM网络源节点和中间节点的排队时延和信元抖动性能，以及在目的节点的源定时恢复问题作了较为全面的研究。首先，文中描述了CBR业务流的信元抖动，并具体地给出了两种与CBR业务源定时恢复有关的信元抖动的定义。然后，采用了精确的数学模型和分析方法，有针对性地分析了业务背景中信元到达的纯随机性、确定性和相关性以及排队缓存器容量等因素对CBR业务流经过统计复用后的排队时延和信元抖动性能的影响。为了了解信元抖动的功率频谱分布和寻求更好的抑制和滤除抖动的方法，在性能分析中，我们成功地完成了CBR业务流信元抖动的功率谱分析，使得不但可以从频域定性地认识信元抖动的能量分布特性，而且还可以定量地求出信元抖动的均方根值(rms：root-mean-square)，以更为准确地衡量抖动的大小。在CBR业务流的多节点端-端排队时延和信元抖动性能分析中，我们提出了一种准周期性(quasi-periodic)信元流模型来描述感染了信元抖动的CBR业务流，并基于这一模型进行了CBR业务流中间节点的初步排队分析。

By analysising the datum in different prestressing force of piston spring shows that raising the prestressing force of piston spring only have a small influence on stroke time to keep the other paramters in costant, but the back stroke time will be decreased and the frequency, the percussive energy and the hydraulic efficiency will be increased rapidly.

对不同锤簧予压力下液动冲击器性能变化的试验数据处理、分析得出：在保持液动冲击器的其它参数一定时，增加锤簧予压力对冲程时间影响不大，但可以大大缩短返程时间，大幅度提高冲击频率、冲击功和液动冲击器的水力利用效率，增加锤簧的予压力是提高液动冲击器性能的一种有效手段。

In this paper, the real-time support about real-time scheduling, preempted kernel, and fine-grain timer in RFRTOS is mainly discussed.

主要从实时调度策略、内核抢占机制、细粒度定时器几方面讨论了RFRTOS的实时支持。

Buy an egg timer if you need to.

如果你有需要就买个鸡蛋定时器。

Dig up an egg timer from your kitchen and use it to cut showers down to 5 minutes.

用煮蛋定时器将淋浴时间限定到五分钟。

A woman had her husband's ashes made into an egg timer when he died so he could still "help" in the kitchen.

妇女安排她的丈夫的灰被做成蛋定时器当他死了因此他能&仍然帮助&在厨房里。

Rotating and zooming into pictures is faster and displays an egg timer whilst processing.

转动和迅速移动入图片是更加快速的和显示蛋定时器处理。

Yet the Litl doesn''t use Windows, or directly run word processors, email, or photo or music programs. It can only perform those tasks via Web sites and services like Gmail or Flckr, Google Docs or Pandora Radio. About the only local program it has that can run without an Internet connection is a virtual egg timer. It has no hard disk or any other way for a user to store anything locally.

不过，Litl笔记本不使用Windows系统，也不能直接启动文字处理软件、电子邮件、照片或音乐程序，只能通过网站和Gmail、Flckr、Google Docs或Pandora Radio这类在线服务运行各种任务，唯一可以在本地运行的软件是一个定时器Litl笔记本没有硬盘，也没有其他方式可以在本地存储数据

Yet the Litl doesn't use Windows, or directly run word processors, email, or photo or music programs. It can only perform those tasks via Web sites and services like Gmail or Flckr, Google Docs or Pandora Radio. About the only local program it has that can run without an Internet connection is a virtual egg timer.

不过，Litl笔记本不使用Windows系统，也不能直接启动文字处理软件、电子邮件、照片或音乐程序，只能通过网站和Gmail、Flckr、Google Docs或Pandora Radio这类在线服务运行各种任务，唯一可以在本地运行的软件是一个定时器。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。