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a kind of design project of multifunction electric power quality gauged instrument based on virtual instrument is put forward in this article.this system integrates virtual instrument programming and power electronics together,to realize diverse signals of current electric power quality field allin one.the integrated signal generator unit which carries out the collection of high speed digital data,d/ a conversion and analog output in four channels,unsymmetrical synchro control fifo etc.by fpga are introduced,the flow of electric power system various signal which generates by vc programming is elaborated,and the structural design of signal amplification unit is analysed.the experiment text result shows that this gauged instrument has attained current advanced high grade of accuracy and it will accelerate the steps of electric power quality calibration because of its accuracy and versatility.

摘 要：提出一种基于虚拟仪器技术的多功能电能质量标定仪的设计方案，采用虚拟仪器编程技术和电力电子技术相结合实现集目前电能质量领域的多样信号于一体。介绍采用fpga实现高速数字量采集、d/a转换及4通道模拟量输出、非对称同步控制fifo等的集成信号发生单元，阐述利用vc编程实现的电力系统多样信号的产生流程，分析信号放大单元的结构设计。实验测试结果表明该标定仪达到目前先进的高精度等级，由于其准确性和多功能性将加快电能质量标定的步伐。

I did it with a 24 marching-band bass drum that I put up on a chair, and just hit with a mallet and with my hands.

我在椅子上放了个步操乐团用的24吋低音鼓，并用小音槌来敲。

A short, stout man of about thirty in white breeches, high boots, and in a batiste shirt, apparently only just put on, was standing in this room. A valet was buttoning behind him some fine-looking, new, silk-embroidered braces, which for some reason attracted Rostov's notice. The stout man was conversing with some one in the adjoining room.

罗斯托夫听见了这种冷淡的嗓音之后，心里害怕他所作的事情，每一瞬间都可能遇见国王的念头具有强烈的诱惑力，因此他感到非常可怕，以致于打算逃走，但是那个遇见他的宫廷侍仆给他打开了通往值日室的门，于是罗斯托夫走进去了。

Oscar put his car on a fixed stall 7. Then he went to a bookstall 8 to buy a piece of paper.

奥斯卡将车停在一个固定车位7，然后到报刊亭8买报纸。

Bill invented the method of using a hot branding iron to permanently put the mark of a ranch on a cow's skin.

比尔发明了一种方法，那就是使用一个热的标记烙铁在牛的皮毛上留下一个永久的标记。

Collazo is a classy boxer who is well able to fire excellent combinations and function well as a clever counter puncher, but come Saturday I believe those assets will not be sufficient to save Luis from the buzz saw pressure that Hatton will put on him. Frankly, I just don't think that he has the kind of firepower that will disturb Hatton more than a tiny tad. Let us not for one moment deny Collazo his skills, but that boxing ability is never what this fight is going to be about; the real question here is ''who is the tougher man?

可那佐，是个优秀的拳手，他能引爆炸药，同时也能想像聪明的数字穿孔者进行精确计算，，但是有些周6 ，我相信这些能力不足以把刘易斯从哈顿施加给他的压力的难堪中解救出来，坦白的说，我不认为他有能力给予哈顿比小孩还强得打击能力，如果我不考虑考纳佐的地技术，而是这场比赛的能力，真正的问题是谁是最强悍的人？

To solv e this problem, a circular correlation method based on FFT for C/A code acquisition was discussed. To improve SNR in weak signal environments, this text put forward a modified acquisition by circular correlation. The analysis and simu lations indicate that the method can make the perˉ formance of acquisition in low SNR improved and verify its validit y.

针对弱信号环境下低信噪比的情况，研究了适合该算法的解决方案，并提出改进的捕获算法，理论分析与实验结果证实了该方法在弱信号环境下具有较好的捕获性能，并能大幅度减少捕获时间。

Then he drew a few lines, put in a few rests, then a clef at the beginning, and we saw these black dots were musical notes. On sounding them we were singing.

后来他画了几条直线，加上几个停音符，在开头的地方加上一个音部记号，那时我才看出这些黑点原来是音乐上的音符。

WIth a Bachelor of Arts , you are on the launching pad. But now you have to start to put on the brakes.

拥有了一个文学位，就好像处在了火箭发射台上，但现在你得开始进行设备装置。

Let's sum up the experience of their ancestors in the global financial crisis was also reflected in one: When the stock, bond, agricultural products (15.93,-0.57,-3.45%, right), metals, energy Yixieqianli, but Gold or not the anti-up, and other things and then drop the more serious when the higher gold on the rise, although the "currency war" there are a lot of controversy, but the author also put forward a very troubling subject people - in the note before Gold has always been recognized as the world's hedge the last choice, after the collapse of national gold standard through a variety of monetary and material readiness to carry out risk reserves, and individuals can not repair a crude oil storage keep it?

让我们加快他们的祖先在全球金融危机的经验总结也反映在1：当股票，债券，（15.93，-0.57，-3.45％，农产品右），金属，能源Yixieqianli，但黄金或不反了，和其他的东西，然后下降，更严重时，社会上越来越高的黄金，虽然&货币战争&有许多争议，但作者还提出了一个非常令人不安的问题的人-前的说明黄金一直被公认为世界上的对冲后，国家黄金标准通过金钱和物质准备各种崩溃最后的选择，进行风险准备金，个人不能修复的原油储存保持下去吗？

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。