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Soft switching can improve the converters efficiency and reduce EMI. In comparison of some methods of approaching soft switching, this thesis presents a Diode Auxiliary Resonant Commutating Network which is composed by an auxiliary bridge and a resonant commutating inductor. This topology not only well realizes zero voltage switching, but also overcomes the parasitic oscillation in the secondary side Diodes. Simultaneously, this topology makes both the secondary side diodes and auxiliary diodes operate on the soft switching state too, which reduces more switching losses and provides requirement for the system to run stably under the condition of self-cooled.

软开关能够提高变换器的效率和降低EMI,通过比较目前多种实现软开关技术方案,本文研究了一种由辅助桥臂和谐振电感组成的二极管辅助谐振换流网络,不但很好地实现了ZVS,并且克服了副边二极管上寄生振荡;同时,该拓扑也使副边二极管和辅助二极管都工作于软开关状态,进一步降低了开关损耗,为系统能够在自冷的条件下稳定运行创造了条件。

Flight simulation ; atmospheric turbulence ; correlation function ; self recursive ; numerical simulation

飞行模拟;大气紊流;相关函数;自递归;数值仿真

The physical mechanism of the fractal structure evolution and the correlation between the self-organization process, solidified morphology and the negative entropy flow were discussed with the dissipation theory for the first time.

首次应用耗散结构理论讨论了分形结构产生的物理机制和非平衡条件下合金系统中负熵流与自组织过程及凝固组织形态的关系。

Assumed that the coherence of the wind load in vertical is the same to the wind speed, the auto power spectrum and cross power spectrum of the wind load on the tower is formulated. Futhermore, the analysis shows that the contribution of the turbulence is about equal to the vortex shedding for the cross-wind motivation.

基于风荷载竖向相干性与风速相干性一致的假设,得到输电塔不同高度的风荷载自谱与互谱,并分析输电塔横风向激励的组成,识别出紊流激励部分与旋涡脱落激励部分约各占一半。

The whole flow field represents the characteristics of anisotropies for the fluctuation of the centerline velocity lacking of self-preserve.

对流场紊动量的分析表明,射流的紊动强度在射流的中垂线上不具有自相似性,射流在整个流场中是各向异性的。

The results demonstrate that mixing bubble to pure jets makes the profile of water elevation flatting, the velocity distribution of centerline rising and the fluctuation of velocity near surface fluctuating. The fluctuation of the centerline velocity lack of self-preserve and the whole flow field represents the characteristics of anisotropies.

对比纯射流情况,掺气射流中掺气使得射流中线附近的流速增大;对流场紊动量的分析表明,掺气使射流中心处水面的紊动加剧,掺气射流的紊动强度在射流的中垂线上不具有自相似性,射流在流场中表现为各向异性。

The company's main products include: drive shaft balancing machines, multi-function balancing machines, vertical balancing machines, circle with a balanced machine, universal joints balancing machines, balancing machines Straflo, since the driver, such as balancing machines.

公司的主要产品包括:传动轴平衡机,多功能平衡机,立式平衡机,圈带平衡机,万向节平衡机,贯流平衡机,自驱动平衡机等。

However, this mirror is now found to be distorted which heavily and nearly unexceptionally reflects the negative state of human beings and their dissatisfactions towards the world. We discover that this mirror has lost its stance, lacking direction and has degraded to be a tool of exhaust venting for negativity, even lifting the ideas of malice, self-destructions, emptiness, cowardly tranquilising ostrich, twisting the truth, ugliness, immorality and so on.

然而现在这面镜子却注重反映社会中的负面形态和人们心中对世界事物的不满,已经失去平衡、缺乏方向、只流於个人负面心态的渲泄,甚至倡导毁坏、自残、虚空的逃避******、扭曲真实和丑恶的道德观等等。

However, this mirror is now found to be distorted which heavily and nearly unexceptionally reflects the negative state of human beings and their dissatisfactions towards the world. We discover that this mirror has lost its stance, lacking direction and has degraded to be a tool of exhaust venting for negativity, even lifting the ideas of malice, self-destructions, emptiness, cowardly tranquilising ostrich, twisting the truth, ugliness, immorality and so on.

然而现在这面镜子却注重反映社会中的负面形态和人们心中对世界事物的不满,已经失去平衡、缺乏方向、只流於个人负面心态的渲泄,甚至倡导毁坏、自残、虚空的逃避麻醉、扭曲真实和丑恶的道德观等等。

Rose Bud jade white jade carved from the natural form in Afghanistan, and its delicate texture, smooth, rich rhyme flow, color and soft, pure white, through high, feel good, strong sense of fats, the right of the slide to show the texture silk roses, and on behalf of the Rose of love with the people to explain the tenacity of love and innocence.

玉玫瑰花蕾选自天然阿富汗白玉精雕而成,其质地细腻、光滑、流韵丰满、色泽柔和、纯白、透度高、手感好,油脂感强,恰到好处的表现出玫瑰丝滑的质感,与代表爱情的玫瑰结合,阐释着国人对爱情的执着与纯真。

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推荐网络例句

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了,但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场,你等着挨绳子吧!

Several theories about reigniting and extinguishing of the arc have been refered.

本文综合考虑了几种电弧重燃和熄灭理论。