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As the saying goes, the mother is the greatest, in order to meet a child's wish; she put herself out of the way, and went to the foot of the Great Wall with children. Perhaps parents all share a common long-cherished ambition, perhaps people are able to understand the dreams hided in the hearts and minds of young children, With the help of the masses of tourists, the children finally step onto the wall and have a overlook, in her panic eyes, it reveal out a ripple flash of smile.

俗话说母亲是最伟大的，为满足孩子的愿望，她不辞辛苦，领着孩子来到了这长城脚下，或许是为人父母都有着共同的夙愿，或许是人们都能理解孩童幼小心灵中的梦幻，在众游客的帮助下，小朋友终于登城远眺，在她那惊却的眸子中闪露出了丝丝的微笑。

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。

The stability and convergence for spectral methods and spectral element methods are presented, with the aid of the knowledge of functional analysis and calculus and with the help of the theorem of Lax-Milagram, the stability and convergence for steady problems, evolution equations and Navier-Stokes Equations are analyzed in detail.

利用泛函分析和微积分的基本知识，运用Lax-Milagram定理等，从理论上比较详细地分析了谱方法和谱元方法在定常问题、非定常问题以及求解Navier-Stokes方程方面的稳定性和收敛性问题，得出了Navier-Stokes方程谱近似的稳定性条件和收敛性准则。

With the help of the existed results in the field of hardware reliability research area, we present a convert method with Gamma function to express the Rayleigh model of human resource allocation during software development process.

通过借鉴硬件开发中过程模型的研究成果，提出了一种采用Gamma函数的转换方式来表达软件开发中关于资源分配的过程的Rayleigh模型。

Withthe specter of communication medium with the help of Horta, he made contact with the Mei Li, Mei Li, but at first did notbelieve that the fact that until she felt the presence of Sam, but the two are still deeply in love No direct contacts andexchanges.

在能与幽灵沟通的灵媒奥塔的帮助下，他与美莉取得联系，但美莉起初并不相信，直到事实令她感受到萨姆的存在，可是，深深相爱的两人仍无法直接接触和交流。

The driver, sometimes alone and sometimes with the help of user-supplied parameters, configures such features of each device as the IRQ and I/O address so that they can interact with the kernel.

驱动有时候是独立的，有时候与用户提供的参数一起，用于配置每个设备的特性，例如IRQ和I/O地址。这样，这些设备就可以与内核交互。

The library was built from the ground up with the support and interaction of the surrounding community – first as a 1:1 model made from beer cartons and later as a finished project with the help of Karo Architekten, who incorporated parts of the facade from the city of Hamm's demolished Horten warehouse.

图书馆在周围社区的支持和配合下建立起来的。先用啤酒纸箱制作出了一个1：1 的模型，之后在Karo Architekten的帮助下完成了工程：将Hamm城中拆迁的Horten仓库的建筑材料进行循环利用。

I recall Sun Yet-sen's very close contacts with Britain, leading up to the famous attempt by the then Chinese legation to kidnap him and return him to China, a plot which was foiled with the help of the British Foreign Office.

我记得孙中山先生和英国有过非常密切的联系，以致发生了当时的中国公使馆企图绑架他并把他送回国内，可是在英国外交部的帮助下，这个阴谋被挫败了。

I recall Sun Yat-sen's very close contacts with Britain, leading up to the famous attempt by the then Chinese legation to kidnap him and return him to China, a plot which was foiled with the help of the British Foreign Office

我记得孙中山先生和英国有过密切的联系，以致当时的中国公使馆企图绑架他并把他送回中国，可是在英国外交部的帮助下，这个阴谋被粉碎了。

I recall Sun Yet-sen's very close contacts with Britain, leading up to the famous atte mpt by the then Chinese legation to kidnap him and return him to China, a plot which w as foiled with the help of the British Foreign Office.

我记得孙中山先生和英国有过非常密切的联系，以致发生了当时的中国公使馆企图绑架他并把他送回国内，可是在英国外交部的帮助下，这个阴谋被挫败了。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。