能量谱

通过仿真实验分析了在常用电压下模体材质和厚度对求解X射线能量谱的影响，给出了选择楔体材料、长度、厚度的参考范围。

Through simulation experiment , we analyze the effect of the material and thickness of the inspected object at the common voltage on X-ray energy spectrum , and then suggest reference choices on the material , width and length of the phantoms .

一种改进的Hilbert能量谱算法研究

The Study of an Improved Algorithm About Hilbert Energy Spectrum

本文研究的是工业CT中的X射线能量谱恢复问题。

This paper presents a procedure for estimating the x-ray spectrum of industrial CT system .

能够有效地恢复出X射线能量谱，能够为射线硬化校正奠定基础。

The study of x-ray spectrum will lead to the development of beam hardening correction algorithms .

在此几何模型的基础上模拟得到过滤X射线各规范的能谱，并与实际测量的能量谱线进行对比。

The energy spectrum of filtered X-ray are simulated based on that geometry model , and compared with the actual measured spectral lines .

地震动滞回能量谱衰减规律研究动力基础系统的双曲线滞回模型及Fourier级数解

Study on attenuation of hysteretic energy spectra of strong ground motion HYPERBOLIC HYSTERESIS LOOP MODEL AND FOURIER SOLUTION OF DYNAMIC FOUNDATIONS

基于小波包能量谱的HMM钻头磨损监测

Drill Wear Monitoring by Using Hidden Markov Model ( HMM ) Based on Wavelet Packets Energy Spectrum

天鹅座X-1硬X射线的能量谱

The energy spectrum of Cyg X-1

小波能量谱及其在热带太平洋SSTA多时间尺度结构研究中的应用

Wes and its application to multiple timescale structure study of SSTA in the tropical Pacific

将该方法应用到穿墙雷达人的运动多普勒特性分析中，并通过希尔伯特-黄变换（Hilbert-HUANGTRANSFORM，简称HHT）得到多普勒信号的时间-频率-能量谱。

This method is applied to the Doppler characteristic analysis of the human movements and the time-frequency-energy spectrum is obtained by Hilbert-Huang transform ( HHT ) .

另外通过建立的低能X射线辐射装置模型模拟了管电压及X光管的靶材料、靶角度、靶厚、靶半径等参数对能量谱线的影响。

Another , several parameters affecting spectral lines such as the x-rays tube voltage and x-ray tube target materials , target angle , target thickness , target radius are simulated through the established low-energy x-rays radiation device model .

最后本文采用结构的第一层加速度能量谱和第一阶频率变化的平方组合成混合特征参数输入到BP神经网络中实现结构的损伤识别。

Finally , the energy spectrum of acceleration response in the first layer and the square of the first stage frequency changes in structure model as characteristic parameters are chosen to put into BP neural network to identify damage .

研究了瞬时频率谱中端点效应产生的原因，将ARMA模型应用于Hilbert能量谱计算中，以旋转机械振动信号为对象，运用所提的方法对HHT中典型的本征模式函数进行仿真实验；

Aimed to solve the end problem in the instantaneous spectrum figure , the cause is researched and ARMA model is introduced in the calculation of Hilbert of HHT .

首先研究了SDOF系统参数和地面运动参数对弹性地震输入能量谱的影响。

The influence parameters , including the parameters of the SDOF systems and the ground motions , on the input energy spectrum are investigated .

基于图像能量谱直方图的纹理检索算法RAH

RAH : A Texture Based Image Retrieval Algorithm Based on the Histogram of Image Power Spectral

晶闸管开关产生了从50Hz到5次谐波的能量谱。

The SCR 's switch creates a power spectrum based from 50 HZ and up to 5th harmonic .

文中详细阐述了基于散射能量谱的行扫描Compton背散射成像原理，将成像方程归结为一个大型非线性方程组，然后用基于多目标优化的神经网络来求出重建问题的解。

A principle of the line-scan Compton backscatter imaging based on scattered photon energy spectra is presented . This imaging equation is concluded as a large-scale system of nonlinear equations .

局部Hilbert能量谱可以反映齿轮振动信号的能量随时间和频率的分布情况，从而可以提取齿轮振动信号的故障信息。

The fault information of the gear vibration signals can be extracted from the local Hilbert spectrum from which the distribution of the energy of the gear fault vibration signal with the change of time and frequency .

本文以4种场地土条件下40条强震记录为输入，对弹性单自由度（SDOF）系统的地震输入能量谱进行了研究。

The earthquake input energy spectrum of elastic single degree of freedom ( SDOF ) system under a world-wide ensemble of 40 earthquake records of different site types are studied .

以振动信号能量谱作为输入量，选择SCGM预测模型，建立了系统状态的预测模型。

Setting the energy spectrum of the vibration signal as the input , the compatible prediction model of SCGM is chosen in system prediction model establishing .

将这两种方法应用于齿轮故障诊断中，结果表明，基于EMD的频率族分离法和Hilbert能量谱方法都能有效地提取齿轮故障特征信息。

These two methods have been applied to gear fault diagnosis . The results of the application to gear fault diagnosis show that frequency family separation based on EMD and Hilbert energy spectrum can extract gear fault information effectively .

结果表明：近断层地震动的脉冲特性对SDOF体系的平均输入能量谱EI和平均能量比谱EH/EI的大小和形状影响明显。

The calculated results demonstrate that the distinct pulse of near-fault ground motions impose remarkable effects on the peak and shape of mean input energy spectra EI and energy ratio spectra EH / EI .

HHT（Hilbert-HUANGTRANSFORM）方法是一种全新而优越的分析与处理非平稳信号的时频方法，它具有自适应性强、高效及Hilbert能量谱可清晰地表明能量随时频分布的特点。

HHT ( Hilbert-Huang Transform ) provides a fire-new and predominant time-frequency method in analyzing and processing non-stationary signals . It has characteristics of self-adaptation and good efficiency , and Hilbert energy spectrum can clearly express the energy distribution with time and frequency in detail .

体系延性系数、阻尼比、自振周期是影响双线性SDOF体系能量谱的重要因素。

Moreover , the ductility level , damping ratio and natural period of systems produce important effects on the energy spectra of bilinear SDOF systems , and the effect of yield stiffness ratio can be neglected .

本文用衰减正弦函数的线性组合作为人体心率变异性（HRV）的信号模型，在不同体位条件下，用Prony参数模型法估计了HRV信号的能量谱，并分析了模型参数的生理意义。

Linear combination of damped sinusoids was used to model the signals of heart rate variability ( HRV ) . The parameters of the damped sinusoids and the energy spectrum were estimated by Prony method in both supine and standing posture .

研究不同的眼震信号经过EMD分解和Hilbert变换后，各IMF分量在时域、频域、时频域以及能量谱出现的不同差异，并与小波分解结果进行比较。

After the different nystagmus signals were processed through the EMD decomposition and Hilbert transform , the intrinsic mode functions showed the differences in the domain , frequency domain , time-frequency domain and energy spectrum . The method was compared the results by the wavelet decompostion .

结果表明，单独采用时频分布参数作为ASR的前端特征并不能改善识别率；而采用标准ASR特征和能量谱时频特征的联合前端特征，可以有效地改善语音识别系统的识别效果。

The results indicate that time-frequency features as front-end can 't improve the performance of ASR solely , while the feature which combines standard ASR features and time-frequency features based on energy spectrum can improve the performance of ASR system effectively .

将黑洞看作由裸黑洞和二维热力学面（黑洞的视界）组成的正则系综，利用量子统计方法给出黑洞Hawking辐射的能量谱。

When we take the black hole as a canonical ensemble composed of a naked black hole and the two-dimensional thermodynamic surface ( horizon of the black hole ), using the quantum statistical method , we derive the energy spectrum of the black hole Hawking radiation .

以4种场地土条件下40条强震记录为输入，分析了结构和地面运动参数对弹塑性SDOF系统累积滞回耗能谱与输入能量谱比值的影响。

The ratio of cumulative hysteretic energy E_H to input energy E_I ( E_H / E_I ) of inelastic SDOF systems with various damp factors and ductility ratios subjected to a world-wide ensemble of 40 earthquake records is studied with time history analysis method .

以图像的自然性程度衡量图像质量，能量谱线性分布是重要的自然图像统计规律（NSS），图像失真改变了该分布并且变化程度与失真强度成正比。

The naturalness can be used for image quality assessment . The linear distribution of power spectral is an important law for natural image statistics . Meanwhile , image distortions change the shape of the power spectral , and the change is proportioned to the intensity of image distortion .