查询词典 hilbert problems

The statistical theory and Hilbert-Huang transformation were used to analyze the flame acoustic signals in time and frequency domains.

应用统计理论和Hilbert-Huang变换对炉内火焰声学信号分别进行了时域和频域的分析。

Wehave obtained two formulas to express thire relation in different view;at the same time,wegive an explicit description of multiplicative unitary operators corresponding to compactquantum group 〓 and 〓 on concrete Hilbert spaces.

我们首先在第四章讨论了紧量子群对应的乘法酉算子和紧量子群与离散群的交叉积对应乘法酉算子的关系，我们得到了在不同观点下的它们之间的关系式；同时给出了紧量子群〓对应的乘法酉算子和〓对应的乘法酉算子在具体的Hilbert空间上它们之间的表达式。

Russell([17]) has showed that, a compact perturbation, generated from unitary operator groups in infinite-dimensional linear Hilbert spaces, is unable to make the perturbed semigroup exponentially stable.

Russell([17])曾指出，无限维Hilbert空间中的酉算子群对生成的紧扰动不能使被扰动半群具有指数稳定性。

In this doctorial dissertation,we study the stabilization,strong stabilization and estimation problem in the framework of nest algebras in Hilbert space.

本文我们是在套代数框架下，研究Hilbert空间中线性系统的稳定化、强稳定化以及一般估计问题。

Through Hilbert transform, a signal's plane trace can be get. There are two frequencies in the tested signal, so the signal's plane trace may be looked as the track of the out pole's end when two poles rotate around parallel axles. Using the knowledge of motion synthesis in theory mechanics, a formula to describing the change of plane trace's step length and angle for two-frequency be get. So we may prolongate the tested signal's plane trace from the echo's initial arriving moment, and get a certain length of the signal's prolongation.

通过Hilbert变换可得到测试信号的平面迹线，测试信号中只含有两个频率成分，视为双频信号，双频信号的平面迹线相当于两连杆绕平行轴转动时外杆杆端迹线，利用理论力学中运动合成和瞬心知识，推导出双频信号平面迹线步长平方满足余弦线性复合函数，而迹线转角可视为线性变化，据此可对回波到来之前的测试信号平面迹线作延长，得到一定长度的信号延展段，信号延展段与实测段作差可得到一次、二次回波的第一个波峰值。

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。

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。

The statistical analysis of this large set of mutations has led us to propose a diagnostic strategy that should help with the molecular work-up of optic neuropathies.

这一大系列基因突变的统计学分析引导我们提出一个诊断策略，可以帮助我们对视神经病变进行分子学的诊断检查。

The results show that the pipe grouting changes the mechanical parameters of surrounding rocks to achieve the security of engineering objectives by reinforcing surrounding rocks and bolcking the water.

研究表明：小导管注浆一方面改变了围岩的力学参数，另一方面利用浆液的固结特性可以实现堵水和加固围岩的工程目标，使隧道在开挖过程中的安全得到保障。