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- Firstly, tested signals are decomposed into number of intrinsic mode functions (IMFs) by using local wave method, and time-frequency spectrums of IMFs are acquired by means of Hilbert transformation. 首先使用局域波法将实测信号分解为多个基本模式分量,经过希尔伯特变换得到各分量的时频谱;
- By sweeping a laser along the pipe to change the local wave speed, physicists might be able to create a horizon. 将雷射沿著管路扫过,可以改变局部的波速,运用这种方式,物理学家也许可以创造出视界来。
- There is an indefiniteness in the wave number that is related to the finite length of the train. 由于波到的长度是有限的,因此相应地在波数上存在着不确定性。
- A new method for analyzing nonstationary signal designated as local wave analysis is introduced. 该文介绍一种新的非平稳信号分析方法一局域波分析。
- The imaginary component of Bloch wave number can serve as a measure of the localization degree of the surface electron states. 表面电子态的局域程度可以用布洛赫波数虚部来表征。
- The critical wave number and critical wave velocity increase under the cocurrent shear and decrease under countercurrent shear. 正向 剪切力使临界波数和临界波速增大,反向剪切力使其减小;
- Then, Local Wave method is introduced in consideration of the non-stationarity characteristic of the vibrating signals from NC machines. 针对数控机床机械系统的非线性和振动信号的非平稳特性,引入局域波分析方法。
- The R of the transversely isotropic matrix model is larger than isotropic model if the final wave number of the two model are the same. 当最终的波数相同时,介质在振幅加强方向弹性模数减弱的情形所得到的R值,会比等向性材料的情形所得到的R值高。
- Local wave method (LWM) could be effectively employed to suppress the interference of the cross-term encountered in processing the multi-component signals through WHOS method. 针对多分量信号Wigner高阶矩谱的交叉项会产生“虚假信号”,结合局域波法,提出了一种抑制WHOS交叉项的新方法。
- Our results also indicate that the imaginary component of Bloch wave number can serve as a measure of the localization degree of the surface electron states. 此外 ;研究表明布洛赫波数的虚部可以作为一个衡量表面电子态局域程度的物理量 .
- A probability distribution function(PDF) of wave steepness was derived under the linear theory frame of statistical distributions of local wave parameters proposed by Sun Fu. 根据孙孚建立的线性海浪局地波要素统计分布的理论框架,已提出了1个海浪波陡的理论分布。
- Based on the theory of Zeeman effect and free spectral range of Fabry-Parot etalon, asimple method for measuring wave number defference and specific charge is designed. 根据原子光谱线在外磁场中的分裂特点和法布里-珀罗标准具的自由光谱范围,导出了一种在塞曼效应实验中测量分裂谱线波数差和电子荷质比的简单方法,并给出了应用实例。
- The paper cowtains the wave run up and overtopping, the design of breakwater, the wave froces, the local wave scowcing and the wave generation technigue. 内容包括波浪爬高和越浪、防波堤设计、波浪力、建筑物附近的冲刷和造波技术等。
- The calculations show that in the low wave number band, the outer surface is stable, while the feedthrough growth on the inner surface is rapid, resulting in the observed pha. 利用小扰动分析法,导出不可压缩球壳结构的馈通增长方程,数值模拟了高压气体驱动外表面有初始扰动的明胶球壳的瑞利泰勒不稳定性模型。
- Therefore, local wave decomposition technology was introduced into the logging date extrapolation method constrained by time-phase model to gain the seismic instantaneous phase. 为此,在时间-相位模型约束的井资料外推方法中,引入局域波分解技术来求解地震瞬时相位;
- Computational examples are presented, and the influence of wave number and wave incidence angle on dynamic stress concentration factor (DSCF) is discussed. 通过算例给出了浅埋圆孔动应力与入射波数、入射波角度的变化规律。
- Therefore, local wave decomposition technology was introduced into the logging data extrapolation method constrained by time-phase model to gain the seismic instantaneous phase. 为此,在时间- 相位模型约束的井资料外推方法中,引入局域波分解技术来求解地震瞬时相位;
- The numerical simulation shows that the modal wave number tomography can be used to invese the average SSP of the cold water mass. Therefore,it shows potential for monitoring ocean internal structure which is range dependent. 数值模拟结果表明 ,简正波波数层析可以用于反演平均声速剖面 ,特别在监测与距离有关海洋环境的声速结构方面大有潜力。
- The conception of multi-scale Hilbert spectrum entropy(MSHSE)was proposed based on the multi scale analysis character of the local wave method(LWM)and its calculation method was developed. 基于局域波分析的时频多分辨特性,提出了多尺度Hilbert谱熵的概念,并给出了多尺度Hilbert谱熵的计算方法。
- It is also found that there are multiple Solutions of the propagating mode with imaginary transverse wave number for certain component parameters, and the mode has the high-frequency cutoff. 此外,还发现当分量参数满足一定条件时,出现了多个虚横波数的传输模式解,并且该模式存在高频截止。