查询词典 DC

A new type high efficiency synchronous step-up DC/DC converter for hand-held device is designed in this thesis. It works in the PFM mode, and its switching frequency can up to 500 KHz. It offers a built-in synchronous rectifier that reduces size and cost by eliminating the need for an external Schottky diode and improves overall efficiency by minimizing losses.

本文设计了一种用于移动电子设备的高效同步整流的DC/DC升压芯片，该芯片采用PFM调制方式，工作频率最高可达500 KHz，内部集成功率管作为同步整流管，代替传统的肖特基二极管，导通电阻仅有0.4？

Crossreference this defense with the attack mode on Table 4-1: Psionic Combat DC Modifiers to get the appropriate modifier to your will save DC.

在表4-1&心灵战斗DC调整值&中查该防御模式和攻击模式以获知你意志豁免DC的相应调整值。

The expression levels of DC surface molecule were analyzed by flow cytometry and the ability of DC to induce T lymphocyte proliferation were evaluated by a liquid scintillation counter and the amounts of cytokines in MLR were measured.

研究表明，慢性乙型肝炎患者存在DC表型及功能缺失，可能是由于其共刺激分子表达降低或细胞因子产生减少所致，提示DC在乙型肝炎的发病中起一定作用[2]。

Dendritic cells are the most potent antigen-presenting cells in human immune system. Our institute has been working on the region of DC development and DC-mediated immune therapy on cancers for a long time. A cDNA library of human dendritic cells has been set up and by large-scared random sequencing, we have isolated a lot of novel fulllength cDNA clones.

树突状细胞(Dendritic cells，DC)是人体内重要的抗原提呈细胞，本研究所对DC的分化发育及其介导的肿瘤免疫治疗的研究工作已进行多年，并在此基础上建立了人树突状细胞基因文库，通过大规模随机测序的方法开展了从DC中克隆新分子的工作，从2万余条EST中发现了许多新的分子。

The device is to make photovoltaic cell output maximum power. It is composed primarily of two parts-Boost DC-DC circuit and maximum power point tracking controller.

该装置是为了使光伏电池输出最大功率，主要是由Boost电路和最大功率点跟踪控制器两部分组成。

This paper studies the phenomena of intermittent subharmonics and chaos in DC DC converters according to the consideration of coupling filter,consequently concludes that the origin of intermittency comes from conducted or radiated EMI.

文章从电路耦合滤波的角度考虑，分析了一类间歇分谐波与间歇混沌现象产生的原理，确定耦合电路传导和辐射干扰是产生该现象的根源，并构造了一个开关变换器模型作为研究对象，仿真与实验均得到了相似的非线性现象，同时对不同的电路参数集，讨论并分析了其对间歇现象产生所起的不同影响，为变换器的稳定设计提供信息。

This paper analyzes and synthesizes the current topologies of single-stage PFC DC/DC converters with the direct power transfer technology,and describes mechanism and implementation of the DPT technology.

本文对现有的应用直接功率转换技术的单级 PFC AC/DC变换器进行了深入的分析和综合，阐明了它们的直接功率转换的机理和实现方法。

The Obama administration looked like a perfect mark when it came to Washington, DC, on a wave of hope and hype (Mr Obama even created the new job of "chief performance officer*").

说起华盛顿，就不得不提到欧巴马内阁，在给于憧憬与宣传方面他们似乎可以得个满分（欧巴马甚至创造了一个新工作，首席性能官）。

In order to improve the power quality of distribution network system, one of the most effective methods is reactive power compensation. In this paper, the Distribution Static Synchronous Compensator for reactive power compensation was studied, and then the digital controller based on One-cycle control was designed. The waveforms of experimental device based on DSTATCOM of one-cycle control were given in this paper. It can be seen from the results that the fluctuation of DC capacitor voltage is lower, the dynamic response speed of DSTATCOM providing or absorbing reactive power is fast, and the accuracy of steady-state compensation can achieve the requirements of reactive power compensation in engineering basically

为了提高配电网系统的电能质量，对无功功率进行精确补偿是非常有效的方法之一；本文研究了配电网静止同步补偿器用于无功补偿，并设计了单周控制的数字控制器；文中给出了基于单周控制的DSTATCOM无功补偿试验装置工作过程中的波形曲线，从试验结果可见，本文设计的单周控制DSTATCOM无功补偿装置的直流侧电容电压在工作过程中波动较小，装置发出或者吸收无功功率的动态响应速度较快，稳态补偿精度基本能够达到工程中无功补偿的要求。

I engaged in research and development and production of AC / DC Products.

我公司从事研究开发和生产AC/DC产品。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。