频谱

X波段渡越管振荡器频谱诊断

Diagnosis on the frequency spectrum of the X-band transit time tube oscillator

根据闭环频谱要求，给出一种新的基于闭环增益成形的PID参数求解方法。

According to the requirement of closed-loop frequency spectrum , a new PID parameters solving method based on closed-loop gain shaping is presented .

SAW色散延迟线与SAW频谱分析器

SAW Dispersive Delay Line and SAW Spectral Analyser

GIS局部放电的动态频谱特性及在线监测技术

Dynamic Spectrum of Partial Discharge in GIS and On line Insulation Diagnostic Technique

心电R－R间期频谱分析对Ⅱ型糖尿病病人心脏植物神经功能的研究

Spectral analysis of R-R interval in the assessment of cardiovascular autonomic nerve dysfunction in NIDDM patients

泰克实时频谱分析仪和RFID配套测试软件

Tektronix real-time spectrum analyzer and RFID wrap test software

光泵NH3分子亚毫米波频谱特性的理论计算

Theoretical Calculation on the Spectrum Characteristics of Optically Pumped NH_3 SMMW

应用Hilbert时频谱和神经网络对发电机转子故障进行分类的方法研究

Classification for Fault of Generator Rotor Based on Hilbert Time-frequency Spectrum and Neural Network

一种DDS信号发生方法与频谱研究

DDS Signal Generator Method and Spectrum Analysis

结果表明，SiC是良好的宽频微波衰减剂，对衰减频谱曲线特征起决定作用；

The results show that SiC is an excellent wide-frequency microwave attenuant , which determine the characteristic of attenuation curve .

直接数字chirp合成及频谱分析

Direct Digital Chirp Synthesis and Spectrum Analysis

X射线衍射分析（XRD）、电化学交流阻抗频谱（EIS）、恒流充放电等方法检测了其结构与电化学特征。

The structure and electrochemical characteristics were examined by XRD , electrochemical impedance spectroscopy and constant current charge-discharge circling methods .

采用特定波长的滤色镜获取窄范围的频谱能量测定温度，避免CCD或其它光电探测器的光谱响应不均匀性对探测的影响；

It is used the special wave length filter to narrow the band and to avoid the optical spectrum character of CCD .

THz时域频谱技术中若干效应的研究

Studies of Several Effects in THz Time Domain Spectroscopy

信息调制部分的平滑化处理在CDMA系统中不会改善频谱的利用效率；

The continuous processing in the part of signal modulation can not improve the efficiency of spectrum in CDMA system ;

在Fourier频谱空间研究了数字图像显示的拼面效应，它表现为低通滤波。

The mosaic effects of digi-tial image display in the Fourier spectral doman are investigated , it is a kind of low-pass fil-tering .

利用FFT频谱分析方法对一矿井通风机的轴不对中及其由此引起的不平衡故障进行了精密诊断。

With this method , the shaft-misalignment and hence the imbalance faults of a mine ventilator are diagnosed minutely .

文章分析了WCDMA试验网的配置，详细描述了单系统测试的射频优化过程，包括频谱监测、小区建立、空载加载覆盖测试等。

The paper describes WCDMA trial network configuration and RF optimization steps in single system test .

并且这种分析方法为不同调制方式下的输出PWM波形的频谱分析提供了一种启发性的思路。

Further more , analytical solution educes an illuminative clue for spectral analysis on complicated output PWM waveforms based on different modulation strategies .

文章介绍了几种基于FFT的频谱校正方法，给出其基本原理和计算公式。

In this paper , some FFT based spectrum correcting methods are introduced , the principle and calculation equations are presented .

分析了数字方法运用于波形合成中由于DAC零阶保持特性造成的信号频谱高频失真的机理；

The mechanism of the signal spectrum distortion because of DAC 's zero-order holding is analysed .

XLPE电缆局放脉冲频谱分析及传感器选频

Spectrum Analysis of the Partial Discharge Pulses in XLPE Cable and Frequency Band Selection of Sensors

对于索质量较大、张力较大、MR阻尼器安装位置较低、外界激励较大、频谱特征多变、低频为主时需要较强的MR阻尼器。

To some larger cable mass , larger cable tension , lower site of dampers , larger excited loads , more complex frequency spectrum and low frequency , the stronger MR damper is need .

由于SAW器件具有频率选择性及较高的插入损耗，使得它的输入必须为高脉冲且脉冲的频谱宽度能覆盖SAW抽头延迟线的中心频率。

Due to the frequency selectivity and high insertion loss of SAW device , the input must be high pulse whose spectrum width can cover the center frequency of SAW tap delay line .

应力对磁、声Barkhausen噪讯频谱特征的影响

Effect of Stress on Magnetic and Sound Barkhausen Noise Frequence Band

采用快速傅立叶变换（FFT）进行电力系统谐波分析时，需要对采样信号截断并离散化，从而导致频谱泄漏和栅栏效应。

Fast Fourier Transform ( FFT ) is inevitable to cause the spectrum leakage and fence effect because of truncation and discreteness in signal collection .

这种方案采用双谐振窄带数字滤波器并结合Chirpz-变换算法来实现窄带频谱分析。

This method is to use a bi-resonant narrow bandpass digital filter with chirp Z-transform to realize the narrow band spectral analysis .

SrTiO3-Nd2O3系陶瓷的介电频谱研究

Study of Dielectric Frequency Spectra of SrTiO_3-Nd_2O_3 System Ceramics

利用磁异常Za的频谱反演二度体磁化方向

Inversion of magnetization direction by the frequency spectrum of magnetic anomalies Za for 2-D bodies

利用FFT频谱分析小波包分解的低频段，用来诊断转轴的各类故障.阐述了缺陷的种类、可能造成的后果与影响；

This makes it possible to diagnose the different faults of machines . Then the possible consequences and affects due to the software faults are stated .