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Improve the accuracy of the initial rotor position estimator by using the Fourier series expansion.

在永磁同步的马达启动方面,则透过送出不同向量空间角度的定子电压向量脉冲所量测到的d轴定子电流的大小来估测转子的初始位置,并利用d轴定子电流在空间向量角度以2π为周期的特性,应用傅立叶级数分析做曲线拟合的方式提高转子位置估测解析度,以提高转矩/电流比节省不必要的功率浪费。

First, a switching function is designed to guarantee that the movement of the system is asymptotically stable in the switching manifold. And the equation of the switching surface is given based on pole assignment theorem; Then a discrete robust adaptive quasi-sliding-mode tracking controller is presented by constructing the two adaptive gains, and the globally asymptotically stability of the system is proved based on the Lyapunov-Razumikhin stability theorem.

首先,利用广义系统的概念给出了系数矩阵为能控标准型的滑模面方程,并利用极点配置定理给出了能使系统稳定的滑模面;其次,构造了含有自适应律的离散趋近律,设计了能够使系统达到同步的变结构控制器,并利用Lyapunov稳定性定理,证明了系统的趋近运动的稳定性。

Also, during this process, the water content in vegetation increases and keeps stable gradually, and the water environment in ecosystem will become suavely.

摘 要:本文以南亚热带常绿阔叶林为基本,同时探讨了热带南亚热带森林演替系列中8种生态系统类型的水分结构,发现植被水分结构的恢复与土壤水分结构的恢复是不同步的,50a以上没有受扰动的土壤,其土壤水分结构在时空上才趋于稳定;植被水分结构的时空稳定性基本上与生态系统的演替状况一致;为满足植被蒸腾的需要,植被中水分的月更新次数随着群落向顶极系统的演替而逐渐减少。

After treatment of benzamide which is an inhibitor of poly polymerase,β-galactosidase activity assays and PCR analysis were performed to test the deletion of LacZ gene and c-Ha-T24ras gene. The results showed that:(1)LacZ gene was deleted from both A13.4-NIH3T3 cells and B12.7-NIH3T3 cells, but neigher from A13.4-HeLa cells nor B12.7-HeLa cells. So it is possible that there is cell line specificity in gene deletion induced by BA.(2) In A13.4-NIH3T3 cells, LacZ gene and c-Ha-T24ras gene were completely deleted at the same time.(3) The transcription activity of exgenous DNA fragment may have same effect on its sensitivity to the deletion induced by BA.

用聚ADP核糖聚合酶的NAD位点抑制剂苯甲酰胺分别处理四种转化细胞后,检测细胞中整合的外源LacZ基因与c-Ha-T24ras基因的删除情况,结果如下:BA诱导的基因删除可发生于NIH3T3转化细胞系,但不能发生于HeLa转化细胞系;位于同一外源表达载体上的LacZ基因与c-Ha-T24ras基因的删除过程是同步的;外源整合DNA片段的转录强度可能直接影响其被BA诱导删除的敏感性。

Software Description: About LivingPictureWeb, This program automatically transforms any 2D digital photograph into a 3D talking character. You canuse either a pre-created WAV file or the inbuilt recording feature to record your own message and the software automatically creates a lip-synced character. The saved file can be sent as a message via e-mail or published on your Web site as a personalized Web site host.

LivingPictureWeb 这个软件自动地把任何 2D 数字相片转化成一个 3D 说话文字,你能够使用或者一份被创作前的 WAV 文件或者内藏记录的特征记载你的特有的消息和软件自动地创作一个嘴唇同步的文字,被保存的文件能够被发送如一条消息通过电子邮件或者如一个个性化的网址主人在你的网站上,很有意思。

Based on international front and hotspot in atmospheric chemistry and aerosol study, considering domestic characteristics of atmospheric pollution, the laboratory has included main research areas below: atmospheric chemical reaction, aerosol chemistry, photochemical pollution, acid deposition chemistry, atmospheric brown cloud, emission characteristics and emission factors of PM and VOCs emitted from various sources, indoor air pollution and its control techniques, health effect of particulate matters, and so on.

研究室的主要研究方向始终瞄准国际大气化学和气溶胶研究和发展的前沿和热点,结合中国大气污染的自身特点,在大气化学反应、气溶胶化学、光化学污染、酸沉降化学、大气棕色云、各种污染源颗粒物和 VOCs 的排放特征和排放因子、室内空气污染及其控制、大气污染的人体健康效应等方面进行实验研究,在上述各方面得出具有国际先进水平的研究成果,建立国内领先和国际先进的学术研究和实验科学体系,确保研究室的学术地位和知名度,与国外相关的研究机构保持同步的发展态势并建立平等的交流机制。

The study of the Chamber of Commerce history has attracted more and more Chinese and foreign scholars' attention in the recent 20 years,which also becomes one of the focuses in China's modern history and studies as well as promotes the progresses in city history,economic history,social history,modernized history to the great extent.

近20年来,中国商会史研究越来越为中外学者所瞩目,成为中国近代史研究的热点之一,并在很大程度上促进了城市史、经济史、社会史、现代化史诸研究领域的进展。换言之,商会史研究的开展是与改革、开放后新史学的构建相同步的,商会史研究中的突破体现了新史学所取得的进展。

When the Simens electrical appliances' first section arrives at the national each big market counter with the European synchronization's drum washer through own sales network, how in the competition does achieve the superheating in the market, lets the more conservative China consumer acceptance Simens drum washer this come from Europe's new things topic, on pendulum in front of Simens electrical appliances' market marketing personnel.

当西门子家电的第一款与欧洲同步的滚筒洗衣机通过自己的销售网络到达全国各大商场柜台时,如何在竞争达到白热化的市场中,让较为保守的中国消费者接受西门子滚筒洗衣机这一来自欧洲的新鲜事物的课题,就摆在西门子家电的市场营销人员面前。

The rest of the People's Liberation Army parade, in ironic procession down Beijing's Avenue of Eternal Peace, featured a solemn march of advanced military equipment - 52 brand-new weapons systems ranging from airborne combat vehicles to colossal intercontinental ballistic missiles on mobile launchers - that flowed for two hours amid myriad serried, well-armed, perfectly synchronized, grim-visaged Chinese warriors.

其余的解放军游行,游行中讽刺了北京的大街永久和平,庄严的游行特色的先进军事装备- 52全新的武器系统包括从空降战斗车辆巨大的洲际弹道导弹移动发射平台上-这流出两小时际无数林立,装备精良,完全同步的,严峻,visaged中的战士。

Comparatively successful works prominentyl reflect the happy and booming life 3 of peasants who live along the Yinghe River and their mental puzzlement under double stress of georgrophical factor and traditional culture. Moreover, the works also show the readers how the peasants try to keep up with the pase of the times.

其中较为成功的作品,突出地反映了现代颍河两岸农民的火热的生活和在中原水土及传统文化心理的双重制约下的精神困惑,以及他们顽强地保持着&与时代同步&的挣扎过程。

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推荐网络例句

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。