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This paper studies a single phase voltage SPWM inverter based on repetitive control, whose key point is achieving a good sinusoidal output wave. Firstly, this paper detailed discusses the inverter system"s working characters and mathematic model. Then repetitive control technique and the choice of its parameters, the whole system"s stability, the strategy of closed-loop control are discussed. Finally

本文首先阐述了逆变系统的工作原理,对单相逆变电源的建模进行了详细讨论;然后论述了重复控制技术理论的原理,重复控制系统参数的选择、整个系统的稳定性、闭环反馈控制的策略;最后给出了基于MATLAB的仿真结果和基于单片机C8051作控制系统的实验结果,并对实验过程中存在的问题进行了详细的讨论。

Computer micro-vision, Mirau microscopic interferometry, stroboscopic photography and laser Doppler vibrator are integrated into this platform. In-plane and out-of-plane periodic motion characteristics of micro-resonator are measured, and out-of-plane transient motion of micro-mirror is analyzed. In-plane displacement, motion phase and resonance frequency can be measured by integrating computer micro-vision with stroboscopic photography, and the repeatable accuracy of in-plane displacement is 30 nm.

实验结果表明,利用计算机微视觉和频闪成像技术能够实现微结构的平面位移、运动相位及谐振频率等周期运动参量的测试,位移的重复精度为30 nm;利用显微干涉和频闪成像技术可实现微结构的离面位移及表面扭曲等周期运动参量的测试,位移的重复精度为3 nm;激光多普勒测振技术具有在频域上对微结构瞬态运动进行分析的优点,是时域上周期运动测试的重要补充。

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Through concretely analyzing the magnitude and error of deflection of the vertical, we can get the results that the long-period, smaller-range non-tidal variations are commonly less than the tidal ones, but the short-period, larger-range non-tidal variations are comparable to the tidal ones, especially in some areas they are even bigger than the tidal ones, this state can be measured by repeated gravimetry completely.

通过对垂线偏差量级和误差大小的具体分析,得出结论:一般长周期的、幅度较小的非潮汐变化要小于潮汐变化,但短周期的、幅度较大的非潮汐变化则可能与潮汐变化相当,个别地区甚至还会超过潮汐变化,这种情况完全可以用重复重力测量的方法检测到,这也说明重复测量的方法是可行的。

Sousa and his wife were enjoying a European vacation in 1896, when they saw a startling newspaper article. Sousa's band manager, David Blakely, had died a few days earlier. Soon Sousa and his wife were on a ship heading home to New York. On the journey home, Sousa started hearing "the rhythmic beat of a band playing within my brain. It kept on ceaselessly, playing, playing, playing. Throughout the whole tense voyage, that imaginary band continued to unfold the same themes, echoing and re-echoing the most distinct melody." When he got home he wrote down the music for what would become "The Stars and Stripes Forever."

苏沙和他的太太在1896年一次愉悦的欧洲之旅途中,看到一篇令人吃惊的报导,苏沙的乐团经理大卫布雷克在几天前突然去世,他们在知道这个消息后立刻搭船回到纽约,在返航途中,苏沙开始听见「乐团在我脑中演奏的节拍、不停地演奏、演奏、演奏,整个回程中那个想像中的乐团一直重复著同样的旋律、并重复演奏最特别的一段旋律」,在他回到家写下整首旋律后、就完成了「永恒的星条旗」的初稿。

Sousa and his wife were enjoying a European vacation in 1896, when they saw a startling newspaper article. Sousa's band manager, David Blakely, had died a few days earlier. Soon Sousa and his wife were on a ship heading home to New York. On the journey home, Sousa started hearing "the rhythmic beat of a band playing within my brain. It kept on ceaselessly, playing, playing, playing. Throughout the whole tense voyage, that imaginary band continued to unfold the same themes, echoing and re-echoing the most distinct melody." When he got home he wrote down the music for what would become "The Stars and Stripes Forever."

苏沙和他的太太在1896年一次愉悦的欧洲之旅途中,看到一篇令人吃惊的报导,苏沙的乐团经理大卫布雷克在几天前突然去世,他们在知道这个消息后立刻搭船回到纽约,在返航途中,苏沙开始听见「乐团在我脑中演奏的节拍、不停地演奏、演奏、演奏,整个回程中那个想像中的乐团一直重复着同样的旋律、并重复演奏最特别的一段旋律」,在他回到家写下整首旋律后、就完成了「永恒的星条旗」的初稿。

Qualitative simulation prototype for product life circle ;2. On the basis of Bass model and product life circle model with repurchase,the author brings out the repurchasing model,discusses the estimate method of parameter in details,and analyzes the diffusion process of bank card industry as well as the sensibility of the parameters.

在分析巴斯模型和重复购买的产品生命周期模型等的基础上,提出重复购买模型,详细讨论该模型的参数的估计法,分析银行卡产业的扩散及参数灵敏度,在此基础上使用模型做产品销量预测,表明模型的参数估计方法及预测方法的有效性和产业相关性的影响度。

This has given rise to a lot of duplicated constructions, so we must conduct fundamental reform in this system so that an investment and funding system that is in line with the requirements of a market economy can be put into place.

配的基础力量,产生了很多的重复建设,配的基础力量,产生了很多的重复建设,必须进行根本的改革,必须进行根本的改革,使它能够符合市场经济的国际惯例。

High percentage distribution of GC-rich repeats of SINEs explain high GC genomic region at 3p25.1 and high concentration of AT-rich repeats of LINEs at 3p26.1 lead to low GC content of the region. Our results suggest isochore structure is the result of coevolution between gene and genome.

同时发现:GC-rich的SINE类重复顺序在GC含量较高的区域有较高的覆盖率,相反AT-rich的LINE类重复顺序在GC较低的区域分布较多,基因分布与基因组这一关系的形成是基因与基因组长期共进化的结果。

Moreover, it contains advanced surfacing, extensive data translators for sharing and reusing engineering data, mechanism design for moving assemblies, shrinkwrap and simplified

而且,它还包含了高级曲面,用来共享和重复使用的工程数据的广泛的数据转换器,用来移动组件的机构设计,收缩范围和,协助数据重复使用的模型检查,输入数据的输入数据专家和创建动画的设计动画。

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