查询词典 spectrum analysis

Power spectrum function, the use of detailed explanation for the analysis of power spectrum is critical.

详细说明：功率频谱函数的使用详细解释，对于分析功率频谱非常关键。

Then it analyzes the unstable and stable signals by applying Short Term Fourier Transform , Wavelet Packet Auto-Regressive Model Spectrum , the Second Order Cyclostationary Spectrum as well as chaos-fractal theory, extracts the fault features of analysis objects.

采用了短时Fourier变换、小波包AR谱、二阶循环谱方法及混沌分形理论分析了稳态和非稳态振动信号，提取出了分析对象的故障特征。

The frequency shifts and relative intensity configuration of multidegree stokes spectrum were measured and a simple analysis of spectrum characteristics using the concepts of effective scattering cross-section and differences of vibrational e...

测试了两类光纤的多级Stokes谱的频移分布与相对强度分布，并从等效散射截面的相对大小和赈动能级差的相对大小对话的特征进行了初步的分析。目的是在实验研究的基础上探索刊用这两类常用光纤构成光纤拉曼激光器以及利用光纤拉曼散射谱的可能性。

Finally, when regarding the component wave of irregular wave spectrum as regular wave1 and calculate the wave refraction In shallow water by Snell's law, the result is different from the result analysis by directional spectrum.

将波谱中各频率之波浪视为单一规则波，用 Snell定率计算其折射角，其结果与实测结果并不一致，表示方向波谱中各频率主方向无法利用规则波之原理以简化条件的方法求出。

By analyzing the theory of higher order cummulants and higher order spectrum ,the methods of machine fault feature extraction are researched based on higher order spectral analysis by using the character that higher order spectrum can restrain the gauss noise.

在分析高阶累积量与高阶谱的理论基础上，利用高阶谱可以抑制加性高斯噪声的性质，研究了基于高阶谱分析的机械故障特征提取方法，提出了基于双谱估计的齿轮故障诊断的方法。

The modem spectral estimate and higher order spectral analysis are utilized to estimate the spectrum of the atom clock data respectively, and the noise characteristic is analysed by fitting to the spectrum of the atom clock.

利用现代谱估计法和高阶谱法分别估计原子钟数据的功率谱，并对功率谱进行拟合，可分析原子钟的噪声特性。

The obtained unsymmetry substituted phthalocyanines were characterized by Mass spectrum, ultraviolet-visible spectrum, Infrared Spectroscopy and elemental analysis.

不对称酞菁经过元素分析、红外、紫外可见光谱和质谱的表征证明其结构，从而证实产物就是目标化合物。

Based on reference to the convention means of the analysis and research for energy spectrum hardening and photon scattering in internal and external, making full use of Beer law and Compton scattering intensity equation, this paper approximatively deduce a theoretical formula of correction of energy spectrum hardening and scattered radiation in Transmission X-ray Industrial Computerized Tomography from a ideal model.

本文在分析研究国内外有关射线能谱硬化修正和散射修正问题的分析方法及其研究状况的基础上，利用X射线透射物质的强度衰减遵守Beer定律和Compton散射强度方程，相继建立了能谱硬化修正模型及其修正方法和散射修正模型及其修正方法。

The content involves Digital Filter, Auto Correlation, Cross Correlation, mean and standard deviation, probability density and probability distribution statistic, as well as Auto Power Spectrum based on Fast Flourier Transfer, Correct Power Spectrum, Cestrum and Frequency Response. The Short-time Flourier Transfer and Wavelet Transfer are included in the analysis program.

具体内容包括：数字滤波、时域加窗、自相关计算与互相关处理、均值和方差计算、概率密度和概率分布统计，快速傅立叶变换基础上的自功率谱、互功率谱、频率响应函数、相关函数、倒频谱分析；基于短时傅立叶分析的联合时频分析、小波变换等。

The dissertation performed some test of the black pottery from Dawenkou and Lonshan cultures with scanning microscope, high resolution electronic microscopic energy spectrum, element analysis, Raman analysis, thermal gravitative analysis and X-ray diffraction. It is discovered that there is a lot of carbon fiber inside the black pottery.

本论文对大汶口、龙山黑陶进行了一系列测试，包括扫描电镜、高分辨电镜能谱、元素分析仪、热重分析、拉曼光谱分析、X射线衍射和岩相分析，发现黑陶内存在大量的碳纤维。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。