查询词典 Hilbert

With Hilbert transformation the signal can be demodulated, and can get the torsional vibration signal..

通过对实验系统简化模型的动力学研究，分析了系统在

In this paper, through analyzing the process of harmonic wavelet fransform, it is found that its essence means after the signal is filtered bandpassingly it would be demodulated by the Hilbert transform.

通过分析谐波小波变换的实现过程，发现信号经谐波小波变换的实质是将信号带通滤波后，进行Hilbert解调。

In fact, Hilbert properly stated in 1990 that the problem of proving or disproving the RH is one of the most important problems confronting 20th century mathematicians. In 2000 Griffiths and Graham pointed out that the RH is the first challenging problem for the 21st century.

事实上，希尔伯特1990年就恰当地提出，证明或否定黎曼假设是挑战20世纪数学家最为重要的问题之一。2000年，格里菲斯与格拉哈姆指出，黎曼假设是21世纪头一个引起挑战性兴趣的问题。

With the development of digital image enciphering techniques,there appeared a lot of methods including those based on Arnold transformation and affine transformation and those based on theories of Hilbert curve,knight-tour problem,Gray code,etc.

随着图像加密技术的发展，出现了各种各样的加密方法，其中有基于Arnold变换、仿射变换、Hilbert曲线、幻方、骑士巡游、Gray码、混沌序列和基于频域的置乱加密技术。

With the development of digital image enciphering techniques,there appeared a lot of methods including those based on Arnold transformation and affine transformation and those based on theories of Hilbert curve,knight-tour problem,Gray code and etc.However,there are few criteria to measure the merits and demerits of these methods.

随着图像加密技术的发展，出现了各种各样的加密方法，其中有基于Arnold变换、仿射变换、Hilbert曲线、幻方、骑士巡游、Gray码、混沌序列和基于频域的置乱加密技术，但是却缺少一种能有效衡量这些方法的置乱程度及反映加密次数与置乱程度关系的标准。

When the creatures round about had recovered their wits, they scampered off to tell Hilbert the Mouse of this new heresy.

当周围的生灵们恢复了理智后，它们很快地散开，告诉希尔伯特老鼠那里有一个新的异教徒。

Hilbert says a higher court agreed to review his case, but won't rule for weeks.

希尔伯特说，更高一级的法院同意重新审理此案，不过要几周后才能作出判决。

Mr. Hilbert says a higher court agreed to review his case, but won't rule for weeks.

希尔伯特说，更高一级的法院同意重新审理此案，不过要几周后才能作出判决。

In this paper Ⅰ successfully applied these methods to fault diagnosis, and presenting some new innovative machinery fault diagnosis method; First Ⅰ present a new gear wornout fault diagnosis method, this method use the vibration signal's time-frequency attribute and instantaneous phase undulation to accurately detect gear's fault, and by comparing with the traditional frequency domain analysis method, this method reveals that many nonlinear and nonstationary characteristic exist in gear's vibration, this tell us that if we use frequency domain analysis method without pay attention to the signal's characteristic, we could get wrong diagnostic result; Then Ⅰ present a new bearing fault diagnosis method, this method use ATVFD and Hilbert transform to do envelop demodulation,Ⅰ analyze the envelop with time-frequency method and find out that this method is more accurate then traditional method.Ⅰ also explain that the modulation of the fault to the carrier wave may also be non-stationary and nonlinear; Finally Ⅰ present a cylinder pressure measurement method of diesel engine by means of vibration, cylinder pressure is an important parameter of diesel engine fault diagnosis, the pressure measuring is simplified a lot by this method,Ⅰ also use the ATVFD and time-frequency analysis to realize it.

本文中将上述理论方法成功地应用到故障诊断中去，提出了几点创新性的诊断方法；提出了一种齿轮磨损故障诊断的新方法，该方法利用振动信号能量的时频域分布特征与瞬时相位波动特征可以进行精确的齿轮故障诊断，并通过与传统的频域诊断方法的比较，揭示出齿轮振动中存在的明显的非线性与非平稳特征，说明了不加选择地利用频域分析方法进行齿轮故障诊断很可能会得到错误的诊断结果；提出了一种轴承故障诊断的新方法，该方法利用ATVFD分解与Hilbert变换进行包络解调，并对解调得到的包络信号进行时频域分析，可以实现更加准确轴承故障诊断，说明了故障对载波信号的调制往往也是非平稳与非线性的；提出了一种利用振动信号进行柴油机汽缸内压力检测的新方法，柴油机汽缸压力的变化是柴油机故障诊断的重要参数，利用振动方法可大大简化汽缸压力的检测过程，该方法也是综合利用ATVFD分解与时频域分析方法实现的。

A two-tier overlay network model is presented in this paper. Some consecutive nodes form an unstructured group and different groups are connected by a globally structured overlay with the Chord protocol. The model uses the Hilbert-based level search and the dynamic load balancing policy of a two-tier ring structure on top of the overlay network.This strategy has not only the characteristics of load balancing but also enough flexibility for searching.

Chord模型可以保证搜索系统中特定数据对象的跳跃次数在O的范围内，但只能根据数据对象的键进行准确匹配查询，不支持多关键字、部分关键字、通配符或是参数取值区间组成的复杂查询[1]；其次，相容散列的理论证明了当系统中有N个结点和K个键值的情况下，在每个结点上运行O个虚拟结点时，每个结点的键值范围可以无限趋于K/N。

The quality of both red and white wine depends very much on the wine maker talent and on the quality of the grapes.

他的红酒和白酒的品质，根据酿造者的能力和葡萄的质量，各有差异。

No, I don't want to get drunk before my next match.

" "不，我不想让我的下一场比赛前喝醉了。