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With a fluttery wave of the hand, she turned and made her way through the jungle of tables toward the back of the room.

她挥了一挥胳膊就转身，穿过许多参差不齐的桌子，朝房子后边走去。

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

In the voltage doubling rectifying circuit, the high voltage has been realized by the positive and negative way, and the voltage between the cathode and anode could reach 1700 V. In the fly-back switching high-voltage power supply, considering the requirements of each unit of the driving circuits on the power supply, the three-group voltage outputs including low-voltage outputs have been realized: 1600V/20mA,12V/500mA, 5V/50mA, in which UC3842 has been used to achieve pulse width modulation.

在倍压整流电路设计中，采用正、负电压方式实现高压，有效降低了阴阳极间所需的高压，最终两极间可产生1700V电压；在反激式开关电源电路设计中，利用UC3842芯片实现PWM调制，考虑到驱动电路各单元对电源的需求，设计了包括低压电源在内的三组电源输出：1600V/20mA，12V/500mA，5V/50mA。

The fastest way to double your money is to fold it up and put it back to your wallet.

能使你的钱翻倍的最简捷的方法是把它对折起来然后放回到你的钱包里。

The definition of the super-addition has been studied using the way of logical analyze by this article, and the super-addition can be defined as: external feed back information form which has the characteristic of controllable provided toward individual in the process of learning skills.

在运动技能控制与学习领域，关于运动技能学习和人们操作的研究中，许多学者一直致力于追加反馈的研究。

We agree to change the queen , use express delivery way to mail time to us please , ask be clearly written down on returning to foster son Shan: The member changes goods cause , changes goods content , mails location back to a place and collects goods information.

c。我们同意调换后，请用快递方式寄回给我们，回寄单上请写明：会员名、调换货原因、调换货内容、回邮位址和收货资讯。

On the way, we could see the beautiful every day with the fountain pool, tall tree with weeping; the graceful book, We often meet their classmates or outside class the good partner, friendly, warm and affectionately called a wave clap back, kindly regards two, maybe a chat recently what has been done.

在去教室的路上，我们每天都能看见漂亮的喷泉与水池，挺拔的槐书与婀娜的垂柳；我们时常碰见自己的同学或是外班的好伙伴，友好地招一招手，亲热地拍一拍背，亲切地问候两句，也许再聊一聊最近做了些什么。

Studies published back in the late 1800s showed that all four-legged animals walk the same way.

发表于19世纪末的研究成果认为所有四肢动物的行走方式都一样。

We feel the same way about these players, especially the relevant free agents who are on the board we would like to have back.

对於这些球员我也是抱持著相同的看法，特别是这些即将成为自由球员而还没有回到队上来人，我们希望看到他们回来。

Methods To improve the technique on the base of traditional way,52 patients with redundant prepuce underwent operations of degloving circumcision from the base of penis,cut off the extra redundant foreskin of the base of penis,and pay attention to protect the veins under foreskin at the back of penis and foreskin frenulum,thus achieve the goal of curing theredundant prepuce.

在传统术式的基础上进行改良，对52例包皮过长患者采用阴茎根部脱袖状环切术，切除多余的阴茎根部皮肤，保护阴茎背侧静脉及包皮系带，根治包皮过长。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。