1) barycenter of frequency spectrum
频谱重心
1.
In frequency field analyzing, the FBC ( barycenter of frequency spectrum) is presented to describe the characteristic of the frequency spectrum of the plasma optical signal.
利用CO2 激光深熔焊等离子体光信号的同轴检测系统 ,提出了频谱重心的概念并以此来分析等离子体光信号的频谱特性 ,研究了平板焊接时对应适度熔透状态时同轴光信号的频域特征。
2) frequency spectrum
频谱
1.
Study on frequency spectrum characteristics of acoustic emission in coal or rock deformation and fracture;
煤体破裂声发射的频谱特征研究
2.
Frequency Spectrum Characteristics of Loran-CPPM Coding Communication;
罗兰-CPPM编码通信的频谱特性研究
3.
On the character of frequency spectrum for an underground engineering wall rock;
某地下工程围岩的声波频谱特性
3) frequency spectra
频谱
1.
In each OPs waveform, the frequency spectra from 10 to 290 Hz were derived by Fast Fourier Transform (FFT).
用快速傅里叶变换计算 OPs的 10～ 2 90 Hz频谱 ,计算频谱的功率总和以及最大功率。
2.
A par-ticular method using frequency spectral analysis and fuzzy mode identification is introduced, And the deeply studied direction is indicated.
本文提出对电气设备噪声进行在线监测和实时故障诊断的概念和研究的必要性，综述了电气设备噪声分析和故障诊断的方法，结合实例介绍了利用噪声频谱分析和模式识别方法进行故障诊断的方案，并指出了深入研究的方向。
4) frequency
频谱
1.
Doppler Features of Central Retinal Artery and Vein: An Observation of Frequency Shift Spectrum in HealthyAdults;
正常成年人眼视网膜动静脉多普勒频谱形态观察
2.
Based on microlocal analysis,the propagation of singularities of semilinear thermoelastic materials with microstretch was studied by using the diagnolization of frequency analysis,and the finite propagation speed of singularities of solutions to Cauchy problem of the model was proved.
基于微局部观点,利用频谱分析对角化的方法,讨论了一维半线性微伸缩热弹性力学材料的奇性传播问题,证明了该模型柯西问题解的奇性传播具有有限的传播速度。
5) spectra
频谱
1.
Bio-impedance spectra measurement and systematic research on electrical impedance tomography;
生物组织复电阻抗频谱测量及电阻抗断层成像系统的研究
2.
Resolution study of the second-order group dispersion effects on the spectra of super-Gaussian pulses;
二阶群色散对超高斯脉冲频谱影响的解析研究
3.
Influence of Initial Chirp on the Evolution of Spectra;
初始啁啾对脉冲频谱演变的影响
6) Spectrum
频谱
1.
Caved coal and rock spectrum on longwall face;
综采工作面煤矸频谱特征
2.
Correlations between spectrum characteristics of DRC and nugget size in resistance stainless steel spot welding;
不锈钢点焊动态电阻曲线频谱与熔核的关系
3.
Study on Spectrum Characteristics of Blasting Vibration Wave;
爆破地震波的频谱特性研究
参考词条
补充资料：人口重心
人口重心
人口龙心特定地域内人口分布的平衡点。计算公式如下:一扮，x--子，一_扮，y一刁犷上式中，王、夕分别为人口重心的横坐标和纵坐标，x，y分别为把这一地区划分成无限小的各区域的横、纵坐标;dP为相应的人口数。在实际计算中，常用如下公式:一艺尸f姜x一厄户万一艺Pi，y一厄可‘其中，x，y、分别为各小区域中心点的经纬度;尸为相应区域的人口数;王、夕为人口重心点的经纬度。 人口重心是人口分布方式和变动的最简单表现，可以根据人口重心的变动情况分析人口分布的变动趋势。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。