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The project will develop a bandpass sigma-delta analog-to-digital converter for digital audio broadcasting system in three years. In the first year, we had finished the system simulation for IF receiver using conventional high speed ADC and bandpass sigma-delta ADC, respectively. We also had done the analysis and design of high-order bandpass sigma-delta modulator structure. In this year, we have developed a coefficient synthesis method for high order bandpass sigma-delta modulator using high order filter transfer functions (inverse Chebyshev bandreject filter function).

本计划将在三年内发展一个能应用在数位音讯广播系统的带通sigma-delta类比/数位转换器(analog-to-digital converter，ADC)，在第一年度中我们分别以传统高速类比/数位转换器及带通SD类比/数位转换器的接收系统为例，并结合编码正交多工器(Coded Orthogonal Frequency Division Multiplex，COFDM)的技术，建立一套DAB系统模拟的方法，同时并研究有关高阶带通SD类比/数位调变器的架构及电路，并已成功开发出一个由高阶滤波器合成的高阶带通调变器。

In order to resolve such question,an optic-fiber current measurement system with simple structure and suitable for high voltage frequency converter was developed based on Faraday effect and principle of optic -fiber current sensors,where a high circular bi-refractive optic-fiber coil was used as a current s...

鉴于光纤传感可以解决上述问题，基于偏振态调制的光纤电流传感器原理，研究一种适用于高压变频器的小巧的，基于法拉第磁光效应的高圆双折射光纤电流检测系统，用Jones矩阵对光纤系统进行分析。

During experiment researches, an impedance converter is designed to connect the standard port with the antenna input port, and the method of comparing with standard linear polarized antenna is used to measure array antenna circular polarized gain.

在实验中，设计了用于连接标准接口和天线输入口的阻抗变换器，对阵列天线辐射特性的测量采用了标准线极化天线比较法。

Analysis of high-power millimeter wave circular waveguide TM01-TE11 mode converter.

牛新建，李宏福，谢仲怜。高功率毫米波圆波导TM01-TE11模式变换分析。

So the proposed ZVT-PWM flyback dc/dc converter does not increase active or passive clamper circuit to suppress the switch voltage stress and can reduce switch loss to promote the efficiency of the circuit.

文中详细说明电路之操作原理并推导各个工作模式下的等效电路及转换器设计方法。

Based on the high frequency power amplifier,a class E resonant high frequency DC/DC and a phase-shifted control strategy are proposed in this paper,the converter based on the idea can heighten switching frequency,reduce the loss of the system,widen the range of output.

以高频功率放大器为基础，提出了一种超高频E类谐振DC/DC变换器的移相控制策略，基于这种思想的变换器可以提高开关频率，降低系统损耗，拓宽输出范围。

Purchase raw material→Converter steelmaking →Hot-roll plate→Cold-roll plate→Heat treatmen t→Stampi ng→Polis hing→Pic k out→Pack ing→Deli very.

采购原材料→自己炼钢→热扎钢带→冷扎钢带→退火→冲压→抛光→挑选→包装→运输在垫圈领域丰富的生产经验以及我们特有的生产流程使得我们可以为我们的合作者提供最好的质量和采购环境。

Purchase raw material→Converter steelmaking →Hot-roll plate→Cold-roll plate→Heat treatmen t→Stampi ng→Polis hing→Pic k out→Packing→Delivery .

采购原材料→自己炼钢→热扎钢带→冷扎钢带→退火→冲压→抛光→挑选→包装→运输在垫圈领域丰富的生产经验以及我们特有的生产流程使得我们可以为我们的合作者提供最好的质量和采购环境。

Our converter offers you some editing features and special effects, including gamma correction, lighting, threshold, colorize, soften and sharpen and edge effect.

图标转换器提供你一些编辑特征和特别的效果，包括微部的改正，点着，极限，使有色彩，变柔软和磨快和超过效果。

In this paper, investigate basic half bridge Three-Level DC/DC converter, the operation and parameter design are disused ,second side commutate diode reverse furbish bring high pinnacle on the main switches.

本文首先给出了基本半桥式三电平DC/DC变换器，详细分析了其工作原理，讨论了主要参数的设计和由于次级整流二极管的反向恢复导致主开关管的电压尖峰。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48