区域电网调度系统中维护信息对称性特征识别

为提升对区域电网调度系统维护信息对称性特征的识别效率及准确率,文中首先通过小波变换方法提取区域电网调度系统中维护信息的特征,然后运用模糊C均值算法分析特征数据的分布情况,并以此为基础,获取维护信息对称性故障特征的波形,根据Ucosθ波形特征识别结果,实现对区域电网调度系统中维护信息对称性特征的识别.实验结果表明:在不同...     

等离子体显示驱动技术发展

等离子体显示技术作为平板显示技术领域重要的分支．面对激烈的市场竞争，在降低成本和提升性能方面承受着巨大的压力。由于驱动电路单元占PDP系统总成本的主要部分，因此，其技术发展变化很快。本文从驱动工作波形的优化、专用集成电路的设计、图像的处理和高分辨率的应用等方面分别介绍了等离子体显示驱动技术近年来主要的发展情况，包括在低成本的设计、显示质量的提高等方面所作的努力。其中．如何调整重置期波形以达到高速、可靠的寻址的目的是本领域的重点研究工作。     

5G的信号波形

本文介绍了5G采用的多载波波形,包括正交频分多路复用(OFDM),滤波器组多载波(FBMC),通用滤波器多载波(UFMC)和广义频分复用(GFDM),说明其基本原理和优缺点,以及在增强移动宽带(e MMB)、海量机器型通信(m MTC)和超可靠低时延(URLLC)通信中的应用。     

基于LabVIEW的示波器采集系统设计

示波器广泛应用于设备老化测试领域,但运行时间不间断、人员必须在现场等条件限制了其适用领域.文章介绍了一种基于LabVIEW的、适用于TBS1000系列的示波器采集与储存系统的设计方法.该系统利用LabVIEW软件,通过RS232协议连接PC和示波器,同时采用TCP协议将上位机与远程设备连接.实现了远程对示波器的参数设定...     

Chirp‐Based Cognitive Ultra‐wideband Radio

In this letter, we propose a cognitive ultra‐wideband radio scheme which is based on a modified chirp waveform. Therefore, it requires only time domain processing in the cognitive radio systems and reduces system complexity and power consumption.     

基于AD9833的高精度可编程波形发生器系统设计

介绍一种基于AD9833的高精度可编程波形发生器系统解决方案,该系统具有可编程设置、波形频率和峰峰值等功能,从而解决DDS输出波形峰峰值不能直接设置的问题,数字设置代替传统信号源的模拟设置。     

一种可调制的连续光谱点光源

短弧氙灯是一种发光强度高,具有从紫外到红外的连续光谱的点光源。本文介绍交流供电的短弧氙灯光源,用两电极短弧氙灯实现三电极短弧氙灯性能的方法。给出了用一个系统满足各种不同发光强度、不同调制波形、不同调制频率的要求,以及在制造和使用过程中应注意的事项。     

MR diffusion - "diffraction" phenomenon in multi-pulse-field-gradient experiments

Using pulsed-field-gradient (PFG) experiments, the sizes of the pores in ordered porous media can be estimated from the "diffraction" pattern that the signal attenuation curves exhibit. A different diffraction pattern is observed when the experiment is extended to a larger number (N) of diffusion gradient pulse pairs. Simulations to calculate signal values from arbitrary gradient waveforms are performed for diffusion in restricted geometries using a matrix operator formalism. The simulations suggest that the differences in the characteristics of the attenuation curves are expected to make it possible to measure smaller pore sizes, to improve the accuracy of pore size measurements and potentially to distinguish different pore shapes using the N-PFG technique. Moreover, when an even number of PFG pairs is used, it is possible to observe the diffraction pattern at shorter diffusion times and measure an approximation to the average pore size even when the sample contains pores with a broad distribution of sizes.     

Decomposition of Benzene in Air in a Plasma Reactor: Effect of Reactor Type and Operating Conditions

The decomposition of benzene was carried out in two types of plasma reactors packed with BaTiO₃ pellets: one reactor had two stainless steel electrodes (SUS reactor), and the other reactor had a glass layer between two concentric electrodes (GL reactor). The decomposition efficiency and the suppression of formation of N₂O and NO_x were greater in the GL reactor than in the SUS reactor. In contrast, the suppression of O₃ formation and the oxidation to CO_x in the SUS reactor were superior to those in the GL reactor. The effect of wa eform and frequency of applied ac power was in estigated for each reactor.     

任意波形发生器ROM查找表的设计

基于直接数字合成器(DDS)技术设计的任意波形发生器中,ROM查找表是DDS模块的一个重要环节,主要用于存储系统的波形数据。介绍使用C语言、Matlab和DSP Builder三种方法生成正弦波、三角波、锯齿波和方波的查找表初始化波形数据,并对每一种方法的程序设计、参数设置以及波形仿真都作了详细说明,所有波形数据均在GW48 SOPC开发系统中测试通过。