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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。

I was far too nervous, but with the help of Steffen Freund, who was there with his family, I finally managed to do it somehow.

我非常非常紧张，但是在斯特凡·弗伦德的帮助下，我总算是完成了这个"任务"。

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。

"We beliee that by working with the community to continue to allow the FoxPro technology to be enhanced, that will help deelopers who currently hae projects written in FoxPro," said Alan Grier, the FoxPro team manager in an eWEEK interiew with Daryl Taft.

FoxPro小组经理，Alan Grier在与Daryl Taft的一次eWEEK访问中说道："我们相信同过与社区合作继续允许提高FoxPro技术，将会帮助现在已经拥有在FoxPro中编写的项目的开发者们。"

There must exist a period for being with quandary, since we go along with our mother tongue and feel no necessity to tackle the rising demand for using another one. So when I considered what the effect would have been for this poor blog, I can't help feeling guity.

可是如果不是这个标志性的电影，我还真的想不起来自己的回忆要从何说起，关于他，应该是在边缘的年代记起的，一个偶像特质不和任何商业策划咬合的，但是却让所有舞台下的观众都惊艳的人。

I observ'd the poor affectionate Creature every two Minutes, or perhaps less, all the while he was here, turn'd his Head about, to see if his Father was in the same Place, and Posture, as he left him sitting; and at last he found he was not to be seen; at which he started up, and without speaking a Word, flew with that Swiftness to him, that one could scarce perceive his Feet to touch the Ground, as he went: But when he came, he only found he had laid himself down to ease his Limbs; so Friday came back to me presently, and I then spoke to the Spaniard to let Friday help him up if he could, and lead him to the Boat, and then he should carry him to our Dwelling, where I would take Care of him: But Friday, a lusty strong Fellow, took the Spaniard quite up upon his Back, and carry'd him away to the Boat, and set him down softly upon the Side or Gunnel of the Canoe, with his Feet in the inside of it, and then lifted him quite in, and set him close to his Father, and presently stepping out again, launched the Boat off, and paddled it along the Shore faster than I could walk, tho' the Wind blew pretty hard too; so he brought them both safe into our Creek; and leaving them in the Boat, runs away to fetch the other Canoe.

不料星期五力大无比，一下子把那西班牙人背在身上，向小船那边走去。到了船边，星期五把西班牙人朝里轻轻放到船沿上，又把他拖起来往里一挪，安置在他父亲身旁。然后，星期五立即跳出小船，把船推到水里，划着它沿岸驶去。尽管这时风已刮得很大了，可他划得比我走还快。他把他俩安全地载到那条小河里，让他们在船里等着，他自己又马上翻身回来，去取海边的另一只独木舟。我在半路遇上他，问他上哪儿去。他说："去取那只小船。"说完又一阵风似地跑了，比谁都跑得快，甚至可以说比马都跑得快。

Getting this help may have less to do with your formal position and authority and more to do with your strategy and approach, which can range from a simple favor1 to convincing others to accept a priority2 of yours as if it were their own.

获取这种帮助跟你的正式职位和权力无多大关系，倒更与你的策略和方法密切相关。策略和方法多种多样，从请人帮个小忙到说服他人像对待自己的事那样优先处理你的事。

If you were caught with tobacco there was hell to pay, and if you went in with money God help you.

要是被他发现你身上带着烟卷，那你就惨了；要是被他发现你身上带着钱，那你就只能乞求上帝的保佑了。

With with the help of sb.

在某人的帮助下。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。