频谱图

心壁多普勒频谱图（cardiacwalldopplerspectrum，CWDS）是用脉冲式多普勒技术检测室壁舒缩运动速度的新方法。

Cardiac wall Doppler spectrum ( CWDS ) is a new method measuring ventricular wall systolic-diastolic motion velocity be using pulsed mode Doppler technique .

动态电阻曲线频谱图中也同样可以提取出与熔核直径相关的信息。

The correlated information can be picked up in the frequency spectrum charts of dynamic resistance curves .

基于MATLAB软件平台的频谱图及在风机故障诊断中的应用

Study of ventilator fault diagnosis based on MATLAB signal analysis

通过分析周期矩形脉冲信号的频谱图实例，详细介绍了开发Madab的Web应用过程和具体程序。

Through the detail example of period square pulse signal spectra display , the paper discusses how to develop Internet program based on Matlab Web Server .

随后又对信号利用FFT变换出信号的频谱图，得出了在不同信号的特征频谱，由此推断声发射信号的峰值频率及特征频率。

Thirdly , concluded the different feature spectrum , and inferred the peak frequency of AE signals and characteristic frequency using FFT transform .

文中提出了频谱图&维格纳分布（SWD）。

Spectrogram-Wigner distribution ( SWD ) is proposed by paper .

借助时间历程图、轴心轨迹图、相图、Poincare映射图以及频谱图分析系统的运动形态。

The movements of the rotors were characterized by time history diagrams , orbits , phase plots , Poincare maps and spectrum diagrams .

在33个节段中，获得27个节段的PW-DTI频谱图。

PW-DTI was feasible in 27 out of 33 segments .

结果得到了三种情况不同成像角度的RF信号，并估计出血流速度，获得彩色多普勒显像以及RF信号的频谱图。

Results Acquired the RF signals of three different categories with different imaging angle and the estimated blood velocity , in addition the color Doppler flow imaging ( CDFI ) and the spectrum were also obtained .

AMI患者2周时DTI频谱图特征：收缩波，舒张早期波E波和E／A（舒张晚期波）振幅比值降低（P均<0.01）。

Character of DTI after AMI 2 weeks : systolic wave , early diastolic wave ( E ) and E / A ( atrial contractive wave ) ratio decreased ( P < 0 . 01 all ) .

利用数值方法求出系统在不同参数情况下的分岔图、时间历程图、相图、Poincare映射图、频谱图等特征图形。

Used numerical method to calculate the bifurcation diagram , time process diagram , phase diagram , Poincare mapping diagram and spectrum diagram of the system .

首先使用短时傅里叶变换（STFT）做信号的时频谱图，并通过图像处理方法对谱图进行预处理；

Firstly , Short Time Fourier Transform ( STFT ) is used to derive the time-frequency spectrograph , which is pre-treated with image processing techniques .

传统方法主要采用Hough变换对模糊图像频谱图中亮条纹进行计算，利用频谱图中心亮条纹的角度和宽度估计PSF参数。

Traditional methods always compute the width and the angle of light stripes in the center of the corresponding spectrum based on Hough transform to estimate the PSF parameters of blurred image spectrum .

同时，还探索将这种基于EMD的分析方法应用于脑电信号的分析中，并给出了脑电信号的部分本征模函数（IMF）分量及Hilbert振幅和频谱图。

The possibility that the EMD method is applied in analysis of an Electroencephalogram ( EEG ) is discussed and a few Intrinsic Mode Function ( IMF ) components and Hilbert spectrum of the EEG are given .

得到了系统在某些参数域的分叉图、时间历程、频谱图、相图、Poincaré映射图。

The diagrams of bifurcation , time course , frequency spectrum , phase and Poincar é map diagrams with some typical system parameters were numerically worked out .

研究发现，频谱图的分辨率较低，Wigner-Ville分布存在很强的交叉项，不适合瞬时信号的检测。

It is found that the spectrogram is of low resolution , and strong cross-terms exist in Wigner-Ville distribution and frequency aliasing and information loss appear for in Choi-williams distribution .

通过信号分析系统能够得到的分析结果包括电流电压的U-I相图、变化率曲线、频谱图以及各种焊接统计参数等。

By applying signal analysis system , U-I phase diagram , rate curve , spectrum charts and other welding related statistical results can be generated .

在压缩面积计算的基础上，计算出胶辊的弹性压力，从而求得胶辊的弹性压力波形图，并给出了对压力波形进行FFT（FastFouriertransform）分析所得到的弹性压力频谱图。

On the basis of calculating the compressed area , the elastic pressure of offset roller is calculated so as to obtain its waveform ; Finally , the authors show the elastic pressure frequency spectrum obtained from the FFT ( fast Fourier transform ) analysis on the pressure waveform .

基于中频发电机AC-DC整流模块产生共模干扰的机理，利用频域法对共模干扰电压进行了计算，并通过MATLAB数学仿真得到了其频谱图，该方法可以推广到其他电力电子系统的电磁干扰分析计算中。

Based on the mechanism of the common-mode EMI from AC-DC rectification module of intermediate frequency generator , the voltage of common-mode EMI is calculated using frequency domain method , and the spectrum diagram is obtained by mathematical simulation via Matlab .

该系统具有软件无线电的优点，利用系统控制UI，可任意选择合适系统的工作频率、调制方式及调制等参数，可实时观察信号波形图、频谱图、星座图以及眼图。

The system has the advantages of software radio . Using the system control UI can optionally select the system operating frequency , the modulation type and parameters , observe waveform diagram , spectrum , constellation diagram and eye diagram of the received signal in real-time .

方法测量32例持续性肺动脉高压的新生儿及20例健康新生儿的右心常规超声指标，同时记录三尖瓣环的脉冲波组织多普勒显像技术频谱图，测量相关时间间期，并计算出Tei指数。

Methods A total of 32 newborns with persistent pulmonary hypertension and 20 healthy newborns were included . Some traditional ultrasonic parameters of right heart , time parameters and Tei index were measured and compared .

针对时频分析中频谱图和Wigner－Ville分布（WVD）的不足，本文采用了一种滤波器组和WVD相结合的方法，并对这种改进的分布的性质进行了分析。

With the defect of spectrogram and Wigner-Ville Distribution ( WVD ), this paper put forward a method which combines the filter bank and WVD , then investigated properties of this improved distribution .

采用Runge-Kutta数值方法求解系统的动力学方程，用分岔图、最大Lyapunov指数曲线、Poincaré映射图和频谱图等分析系统的稳定性。

The dynamical equations of motion are solved using the Runge-Kutta numerical method , and the stability of the system is analyzed through the bifurcation diagrams , the curves of maximal Lyapunov exponents , the Poincar é maps and the spectral plots , etc.

将气体动压径向轴承瞬态Reynolds方程和转子的动力学方程组耦合进行求解，运用轨迹图、时域图、频谱图等，对气体动压轴承支承的Jeffcott转子模型的非线性动力特性进行数值模拟分析。

The rotor dynamics equations is calculated coupled with gas lubrication transient Reynolds equation . Trajectories spectrum , time domain spectrum and frequency spectrum are used to study the nonlinear dynamic characteristics of Jeffcott rotor model supported by the self-acting gas bearing .

非线性油膜力数据库方法获得非圆滑动轴承的非线性油膜力，利用Runge-Kutta法、Poincaré映射和频谱图对刚性Jeffcott转子&椭圆轴承系统在较宽参数范围内的分叉和非线性动力学行为进行研究。

The nonlinear dynamic bifurcation behavior of a rigid Jeffcott rotor-non-circular bearing system was investigated in a wide rang of parameters based with the help of Runge-Kutta method , Poincar é map and frequency spectrum . The journal bearing oil film forces were obtained from database .

小波变换分离太阳射电频谱图中的纤维结构

Separate the Fiber Structures on Solar Radio Spectrum by Wavelet Transform

倍频程及1/3倍频程频谱图场致倍频吸收在双光子响应中的作用

The Role of Electric-field Induced Double-frequency Absorption in Two-photon Response

吸烟对心电频谱图影响的初步观察

A preliminary study of effect of smoking on frequency-domain cardiogram

绘制有关的性能曲线，和波形和频谱图。

Drawing on the performance curve , and the waveform and spectrum .

频谱图表明电极过程由电荷传递所控制。

Frequency spectra denote that the electrode process is charge transition controlled .