详细研究

Firstly it describes the development ,basic principle and application and propagation characteristic of mobile channel , then investigates the system structure of DAB transmitter and receiver separately and the key technology of realization of the digital audio broadcast system.And then discusses the system component of FFT －the demodulation module of OFDM .The 409- points FFT module employs a radix-4 decimation-in-frequency algorithm, includes arithmetic element , read and write address element ,twiddle factor element and control element , is realized by FPGA. In the end , the result is verified in the matlab .

首先概述了OFDM的发展、基本原理和应用以及移动信道的传播特性，接着分别研究了数字音频广播接收机和发射机的系统结构，以及数字音频广播系统实现的关键技术，然后详细论述了OFDM解调模块FFT的系统结构，主要研究了4096点FFT采用基－4按频率抽取实现的算法，整个FFT模块包括了运算单元、读写地址单元、旋转因子单元以及控制单元，并且在FPGA中进行了硬件实现，并在matlab环境下对结果进行了验证。

On such a foundation, This paper made a particular research and practiced on the combination of assignation of campaign artillery firepower and battlefield environment.

本文在这样的一个环境下，对战役炮兵火力分配与战场环境的结合进行了比较详细的研究与实践，主要研究内容如下： 1。

Algorithm application of neural networks.Ⅲ Implementation of neuro-computers. The main contribution of the dissertation can be summarized as follows: 1 Hopf bifurcation of three kind of neural networks are discussed in detail, including type of discrete time delay, type of time delay with weak kernel and strong kernel as well as the proof of existence of bifurcation. Other problems such as asymptotic stability of bifurcation periodic solution, algorithm of determining the bifurcation direction, asymptotic stability and style of periodic solution are also studied. The average time delay is chosen as the bifurcation parameter, phenomena pertinent to system states of the continuous time delay network with strong kernel evolving from stable to oscillating, then back to stable again are observed.

论文的主要创新之处可以归纳如下： 1）针对目前国内外对神经网络的分岔研究较少的情况，论文中详细讨论了带离散时延神经网络、带弱核的连续时延神经网络、带连续分布时延且具有强核的神经网络的Hopf分岔现象，从理论上证明了Hopf分岔的存在性，并研究了分岔周期解的渐近稳定性，得到了确定周期解的渐近稳定性、分岔方向、周期解的渐近形式的算法；用平均时延作为分岔参数，发现带强核的连续时延神经网络中存在着系统的状态由稳定变化到振荡现象，当继续增加平均时延参数时，又从振荡变为稳定这一特殊的动力学现象。

In this thesis, we mainly study the multi-scale asymptotic expansion and high accuracy algorithm for the periodic structure of composite materials.

本文主要研究复合材料周期结构的多尺度渐近展开与高精度算法，特别对多孔复合材料的多尺度渐进展开与高精度算法作了比较详细的研究。

In the 3rd part of this thesis, two attempts to study the surface enhanced infrared spectroscopy of azobenzene acids monolayer on silver island films are discussed.

成功地在通过真空蒸镀的银岛膜基底上获得了偶氮酸LB膜的表面增强红外光谱，同时对偶氮酸LB膜在不同厚度的银岛膜上的表明增强红外光谱性质进行了详细的研究，进而对银岛膜上的表面增强红外光谱的机理进行了研究。

Back electromotive force was measured by continuous pulse-computer and the influencing factors for back electromotive force and current efficiency were studied in detail.

研究了在SrCl2-SrF2-BaF2的电解质体系中熔盐电解法制备高浓度Al-Sr合金，采用连续脉冲-计算机法测定电解过程的反电动势并且对反电动势和电流效率的影响因素进行了详细的研究。

It consists of six parts; the first introduction relating to its significance and backset; the second is a summary about documents, the purpose of content and methods of research. The third expands on the effective teaching connotation, theoretical basis and characteristics of teaching mode.

论文共分六大部分，第一部分为前言，介绍本论文研究的背景、意义；第二部分为文献综述和研究目的、内容和方法；第三部分对有效教学及教学模式的内涵、理论基础、发展、现代教学模式的特点等几方面做了详细的理论上的阐述。

On the basis of analyzing the whole model structure evolution, the author wishes to get a reasonable customer satisfaction index model, corresponding to national practice and basing on the statistical point of view.

本文详细分析了模型中各个隐含变量的结构关系，在总结和归纳的基础上，希望能提炼出当前世界上用户满意度指数模型研究的一些共同特点，以便用于更好的指导我国CCSI 研究的进展，并提供有价值的参考借鉴。

By means of the non-linear finite element analysis,the defect-free tee under bending moment was researched in this paper.

本文采用有限元分析的方法，在对纯弯矩作用下无缺陷三通进行研究的基础上，详细地研究了单一弯矩及不同比例内压弯矩联合作用时底部减薄缺陷对三通塑性极限载荷的影响。

Berthelot, the great French founder of modern synthetic chemistry, once stated in a letter to a close friend that the final experiments which led to his most wonderful discoveries had never been the result of carefully followed and reasoned trains of thought, but that, on the contrary,"they came of themselves, so to speak, from the clear sky."

法国现代合成化学研究的奠基人 Berthelot 曾在给密友的一封信中谈到，关于他的伟大发现的最终的验证试验其实并不是经过详细思考、仔细研究得来的结果，反而是这些试验自己来找他，就象从天而降一般。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。