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The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.

本文研制了用于真空度检测的高频脉冲电源，通过Simulink仿真和试验检验其满足设计要求，实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出；利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集，通过异步串行通信实现单片机与计算机之间的数据通信，将检测数据传至上位机；在上位机利用Matlab开发人机交互界面，实现相关数据处理和图形显示，包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。

While Shanghai's outskirts lack the rugged scenery of the Great Wall, day trips or overnight visits by train or bus to the close-by garden cities of Hangzhou and Suzhou are easy, inexpensive getaways.

虽然上海的郊区缺少了长城这样的风景，到附近的园林城市杭州，苏州一日游或坐火车或公共汽车参观是容易且廉价的度假。

After every regular bus sends a car, the check ticket record that passenger station gives the unit that enter camp is the primitive evidence that the unit that enter camp uses settle accounts carriage, every order a piece, undertake by primitive credential and passenger station settle accounts; returns some units that enter camp to have close an account every months with passenger station by passenger counterfoil every months.

每辆班车发车后，客运站给参营单位的检票记录是参营单位用来结算运费的原始凭据，每班次一张，每月凭原始凭据与客运站进行结算；还有的参营单位凭旅客票根同客运站进行每月结算。

The last but not least, it is also owning to the rapid development in computer science and information technology. Such as, some computational task, which previously must be executed by using super-computer, now can be carried out by personal computer, and at the same time, the network speed and band width of data bus and input/output equipment have increased several times. In addition, the improvement of the high quality graphic displaying is available. All these provide strong support for cryoEM high-resolution reconstruction study.

目前，在低电子剂量的情况下，冷冻电镜照片可以记录到3-4 〓的信息，使用冷冻电子显微镜进行高分辨三维重构工作，已经获得6.5-8〓高分辨率水平的结果，可以分辨出蛋白质的α螺旋、识别出蛋白质的β折叠等蛋白质二级结构；其次是，三维重构算法效能的不断提高，使得对二十面体取向和中心参数计算的可靠性大大提高；再次是，由于计算机和信息技术迅猛发展，例如，以往需要使用大型计算机的计算任务已经可以被一般的个人电脑完成，网络速度、数据总线和硬盘等I／O设备的带宽成倍增长，以及图像显示能力的提高都为冷冻电子显微镜高分辨三维重构技术提供了强有力的支持。

Nowadays, in the low electron dose condition, the information about 3-4〓 can be recorded on the cryoEM micrograph, and the high-resolution reconstruction using the cryoEM has reached 6. 5-8〓 levels. The reconstruction can reveal the protein α helical and recognise β fold secondary structure. Secondly, it is due to the development in 3D reconstruction method, which can be more efficient to determine the orientation and center parameters. The last but not least, it is also owning to the rapid development in computer science and information technology. Such as, some computational task, which previously must be executed by using super-computer, now can be carried out by personal computer, and at the same time, the network speed and band width of data bus and input/output equipment have increased several times. In addition, the improvement of the high quality graphic displaying is available. All these provide strong support for cryoEM high-resolution reconstruction study.

目前，在低电子剂量的情况下，冷冻电镜照片可以记录到3-4 〓的信息，使用冷冻电子显微镜进行高分辨三维重构工作，已经获得6.5-8〓高分辨率水平的结果，可以分辨出蛋白质的α螺旋、识别出蛋白质的β折叠等蛋白质二级结构；其次是，三维重构算法效能的不断提高，使得对二十面体取向和中心参数计算的可靠性大大提高；再次是，由于计算机和信息技术迅猛发展，例如，以往需要使用大型计算机的计算任务已经可以被一般的个人电脑完成，网络速度、数据总线和硬盘等I／O设备的带宽成倍增长，以及图像显示能力的提高都为冷冻电子显微镜高分辨三维重构技术提供了强有力的支持。

Railroad, bus, and plane scheduling was hampered by time inconsistencies among various cities and states. The Uniform Time Act, enacted by the U.S. Congress in 1966, established a system of uniform daylight-saving time throughout the United States and its possessions, exempting only those states in which the state legislature voted to keep the entire state on standard time.

在不同的城市和国家之间，铁路、巴士、飞机的时刻表也会受到时间冲突的影响。1966年，美国国会颁布了《统一时间法案》，在全国范围内确立并执行了一套统一日光节约时间的制度，并且该制度只能在州立法机构投票决定在全州内部执行标准时间的条件下才能废除。

According to the character of outer shape of modem buses, the numerical calculations are performed from the simplest shape-cuboid by using ANSYS/FLOTRAN software. First, the foreside of the cuboid is modified step by step in 17 models (this is equal to the process of modification to the foreside of a bus).

在本文中，应用ANSYS／FLOFAN软件，根据现代客车外形的特点，从最简单的长方体开始进行数值模拟计算，首先对长方体的前部进行逐步改造(相当于对一个客车头部进行改造的过程)，这一步骤包括了17个模型；然后再对其尾部进行变化，以模拟客车后车体形状对空气阻力系数的影响，该步骤包括9个模型：最后给出两种现代客车的数值模拟结果。

Liuzhou is located in Guangzhou City Hakata commercial artery of the center, close to Guangzhou by land and rail transport the heart of the provincial bus station and the Guangzhou Railway Station, surrounding a large wholesale market for international goods, closely surrounded by geographical location is extremely advantageous.

博龙位于广州市商业动脉的中心，紧贴广州陆运和铁路交通运输的心脏省汽车站和广州火车站，周边个大国际货品批发市场紧密环绕，地理位置十分优越。

Get on bus at Tianwai Village to the Midheaven Gate, walk or by Cableway via Cloud-Cut Sword, Yunbu Bridge, Five-Men Pine, Eighteen Bending Stops, South Gate of Heaven to the peak scenic area which includes Sky Street, Viewing-Wu Saint Ruins, Bixia Temple (5 yuan for every person, pay by yourself), Tang Stone Inscription, Jade Emperor Temple, Gongbei Rock etc..

D2、早餐后游览五岳独尊泰山：天外村乘车赴中天门，步行或缆车登山，经斩云剑、云步桥、五大夫松、十八盘、南天门至岱顶景区：天街、望吴胜迹、碧霞祠（5元/人，门票自理）、唐摩崖石刻、极顶——玉皇庙、拱北石等，晚住莱芜。

They can be connected by normative bus, when set up auto test system, user can set up instrument produced by different country, different factory and in different time to be monotype platform test system including no more than 15 instrument.

为此，本文为半导体激光器驱动电源设计了一种GPIB 通信接口，通过它，计算机可以控制半导体激光器驱动电源的工作，而驱动电源也可以通过GPIB 接口将自身的工作情况传送给计算机。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。