一种基于PI技术的并行自适应滤波结构

基于PI技术，在原多项式表示的并行处理结构基础上提出了一种新的并行自适应滤波结构。新结构的复杂度远远低于基于多项式表示的并行结构，与普通串行的自适应FIR滤波器相当，所以在保证数据通过率较高和系统功耗较低的同时，因为结构简单而更易于实现。MATLAB实验仿真运行结果表明新结构算法在收敛速度上明显优于前两者，从而为并行自适应实时处理提供了现实的可行性。     

从TM影像中提取城镇建筑覆盖区专题信息的改进方法

选用TM影像作为城镇建筑覆盖区专题信息提取的数据源，在Bayes的最大似然法半自动提取城镇专题信息和建筑指数法自动提取城镇专题信息分类方法的基础上，通过二值逻辑演算，综合两种方法的分类结果，去掉不属于城镇的信息，得到真正的城镇建筑覆盖区专题信息。实验结果表明，改进后的分类方法，兼有自动与半自动的优点，其分类精度大大提高。特别是对于短期变化(如防洪区)较大、面积较大而复杂的研究区来说，这一方法的应用弥补了单一分类方法的不足。     

现代电能质量的主要问题及其对策

阐述了电能质量的概念，分析了产生电能质量问题的原因及其分类。指出电压暂降是现代电能质量的主要问题。介绍了几种具有代表性的解决电压暂降问题的用户电力设备(如DVR，UPQC等)的工作原理和特性。     

Analysis,simulation and verification of a bipolar current source power resonant inverter

A high‐frequency bipolar current source resonant inverter introduced in this paper has dramatic zero‐voltage‐switching (ZVS) characteristic. The analytic expressions of the resonant voltage and current are given. It indicates that the resonant waveform is composed of two parts, i.e. the oscillatory component and the stationary component. In special cases, the resonant waveform degenerates into the mono‐frequency component, as presents the graceful sinusoidal wave with very low total harmonic distortion (THD) value. Based on the closed‐form voltage and current, the component stresses on reactive elements are obtained. The impact of different component values and operating frequencies on ZVS feature is also discussed. It should be noted that the ZVS merit may be lost if the components are carelessly selected. The validity of the theoretical analysis has been proven with Pspice simulations and experimental results. Copyright © 2004 John Wiley Sons, Ltd.     

机载雷达自适应MTI技术及其应用

机载雷达杂波抑制技术从诞生之时起，就由于军用和民用的强烈需求而得到飞速的发展。该文提出了一种基于现代谱估计(NEM)的自适应MTI技术，并介绍了AANTI技术的工作原理及设计过程，最后介绍了雷达自适应MTI技术在雷达系统中的应用。     

足球教学训练中的技术与战术关系

足球技术和战术在足球课教学中具有突出的重要地位。技术是足球训练的基础与核心，是完成战术配合及决定战术行动效能的前提和保证。它们是教学训练和竞赛中必不可少的两个重要因素。     

激光莫尔传感器在精密定位中的应用

应用激光莫尔信号传感器设计了一套精密定位装置 ,可实现高精度位置检测及精密自动定位 ;系统采用的激光补偿技术及差动光栅技术 ,极大地提高了位置检测信号的灵敏度与定位精度 .实验结果表明 ,精密定位装置可获得± 0 1μm的定位精度 ,对集成电路制造技术等精密加工工程领域具有重要的实用价值     

Research on Processes and Adhesion of Electroless Plating Ni-Cu-P Coating

In order to improve the corrosion and wear resistance of the coatings of electroless plating Ni-Cu-P and broaden its application, an optimizing mathematical theory test has been applied in this research. The processing parameters have been optimized and some Ni-Cu-P coatings have been obtained with smooth and glittering appearance. At the same time,the composite complexants can prevent copper from depositing first and obtain coatings with strong adhesion. The porosity of Ni-Cu-P coating (20 μm) ranked class 9. The changing color time of the coating is more than 800 seconds with HNO3 dropthan 0.5 g/L. The surface appearance of deposition is typical cystiform cells by SEM,which rank close and neatly.     

Multistage solid-state power amplifier design by a new alternative synthesis technique

For the first time, the numerical real-frequency technique has been applied to the design of a nonlinear power amplifier. This synthesis technique does not require any transistor model by directly using measured large-signal S-parameters of the power transistor device. The double power-frequency dependence of these S-parameters requires the use of a bidimensional interpolation (spline functions). With the Levenberg–Marquardt optimization and large-signal S-parameters, a specific CAD program optimizes the added-power in order to synthesize the matching networks of the PA. The simulated and measured results of two S-band power amplifiers validate the new synthesis approach. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14, 87–98, 2004.     

棉花优质高产抗旱节水技术大田试验研究

按照生态农业工程理论和抗旱节水工程技术要求,对棉花转基因抗旱品种、不同密度、不同基肥N、P的施用量进行田间水分胁迫综合试验.经在关中灌区3年试验研究结果表明:密度以每公顷种植7.5万株比种植4.5、6万株分别增产671.854、83.30 kg,增产57.49%和41.36%.品种陕402(早熟)、陕576(中早熟)分别比中棉所41(中熟)增产16.62%和16.17%.施磷酸二铵比尿素增产,每公顷施1502、25 kg分别增产11.35%和10.53%.抗旱节水农业工程育种和农艺节水工程技术结合,不仅可降低生产成本44%~47%,还可提高产量和品质,增收1 050~5 000元/hm2,同时节约了水资源,保护了农业生态环境.