SXGA TFT-LCD驱动电路的设计

文中详细分析了一种分辨率为ＳＸＧＡ的液晶显示器驱动电路的设计概要,介绍了其所使用的驱动方法－－三级电压驱动方法、数据驱动器和扫描驱顺的结构及其功能,对在驱顺的灰度级产生方法进行了分析,并阐述了电路中电磁干扰（ＥＭＩ）的解决方法,对接口中所应用的ＬＶＤＳ技术进行了说明。     

宽带城域网及其增值业务

城市信息化离不开城市信息高速公路 ,宽带城域网的建设为城市信息化提供了高速通道。IP网和ATM网将是宽带城域网的核心平台 ,宽带接入技术将成为城域网接入的主要手段 ,宽带城域网整体解决方案离不开IP软技术的应用 ,三网融合将是宽带城域网发展方向。增值业务是网络不断发展的动力所在     

光电成像系统与人眼视觉的匹配问题

以电视、激光成像和热成像系统为代表的光电成像系统在军事和民用上有着广泛的用途,但光电成像系统与人眼视觉的匹配问题仍是按现有理论和方法难以准确解释或定量描述的普遍问题。从理论上阐述了此问题的本质,说明了在这种匹配系统中存在系统的最佳匹配,且匹配状态直接影响光电成像系统的总体设计,并对如何描述这种关系进行一些说明和分析。     

Giant traps on the surface of hydride vapor phase epitaxy-grown free-standing GaN

Extended defects on the top surface of a 250-μm-thick free-standing GaN sample, grown by hydride vapor phase epitaxy (HVPE), were studied by deep level transient spectroscopy (DLTS) and scanning surface potential microscopy (SSPM). For comparison, similar studies were carried out on as-grown HVPE-GaN samples. In addition to the commonly observed traps in as-grown HVPE-GaN, the DLTS measurements on free-standing GaN reveal a very high concentration of deep traps (∼1.0 eV) within about 300 nm of the surface. These traps show nonexponential capture kinetics, reminiscent of those associated with large defects, that can accumulate multiple charges. The SSPM measurements clearly reveal the presence of charged microcracks on the top surface of the sample. It appears that the “giant traps” may be associated with these microcracks, but we cannot rule out the involvement of other extended defects associated with the near-surface damage caused by the polishing/etching procedure.     

埋栅型电力静电感应晶闸管的Ⅰ-Ⅴ特性反向转折机理

研究了静电感应晶闸管的反向转折特性.当工作在正向阻断态的阳极电压增大到某一临界值时,静电感应晶闸管的Ⅰ-Ⅴ曲线呈现出反向转折特性,甚至转向导通态.在综合考虑了工作机理、双注入效应、空间电荷效应、沟道中的电子-空穴等离子体和载流子寿命变化的基础上分析了静电感应晶闸管的反向转折特性.首次给出了反向转折机理的理论解释,并给出了估算转折电压和电流的数学表达式,在常用工艺参数范围内,计算结果和实验测量值基本一致.     

Triphenyl phosphine oxide-bridged bipolar host materials for green and red phosphorescent organic light-emitting diodes

Two wide band gap functional compounds of phenylbis(4-(spiro [fluorene-9,9'-xanthen]-2-yl)phenyl)phosphine oxide (2SFOPO) and (4-(9-ethyl-9H- carbazol-3-yl)phenyl)(phenyl)(4-(spiro[fluorene-9,9′-xanthen]-2-yl)phenyl)phosphine oxide (SFOPO-CZ) were designed, synthesized and characterized. Their thermal, photophysical, electrochemical properties and device applications were further investigated to correlate the chemical structure of bipolar host materials with the electroluminescent performance for phosphorescent organic light-emitting diodes (PhOLEDs). Both of them show high thermal stability with glass transition temperatures in a range of 105–122 °C and thermal decomposition temperatures at 5% weight loss in a range of 406–494 °C. The optical band gaps of compound 2SFOPO and SFOPO-CZ in CH₂Cl₂ solution are 3.46 and 3.35 eV, and their triplet energy levels are 2.51 eV and 2.52 eV, respectively. The high photoluminescent quantum efficiency of emissive layer of doped green device up to 50% is obtained. Employing the developed materials, efficient green and red PhOLED in simple device configurations have been demonstrated. As a result, the green PhOLEDs of compound SFOPO-CZ doped with tris(2-phenylpyridine) iridium shows electroluminescent performance with a maximum current efficiency (CE_max) of 52.83 cd A⁻¹, maximum luminance of 34,604 cd/m², maximum power efficiency (PE_max) of 39.50 lm W⁻¹ and maximum external quantum efficiency (EQE_max) of 14.1%. The red PhOLED hosted by compound 2SFOPO with bis(2-phenylpyridine)(acetylacetonato) iridium(III) as the guest exhibits a CE_max of 20.99 cd A⁻¹, maximum luminance of 33,032 cd/m², PE_max of 20.72 lm W⁻¹ and EQE_max of 14.0%. Compound SFOPO-CZ exhibits better green device performance, while compound 2SFOPO shows better red device performance in PhOLEDs.     

论三峡水库泥沙淤积的控制——处理三峡水库泥沙的策略与措施

本文专门论述三峡水库泥沙淤积的控制，它是解决三峡工程泥沙问题的关键之一，首先介绍了根据多年研究，提出的利用水库长期使用方法，控制库容淤积，从而能保证绝大部分防洪库容和调节库容。其次提出按照水库积和回水的相互作用，利用防洪限制水位控制库尾回水抬高、筘辊重庆市洪水位抬高，以尽可能减少中、后期淹没，第三、着重阐述了在三峡水库泥沙研究中为了增加水库航深，首次提出航运控制调度的概念，以限制枯水期水位消落，增加其航深，在此基础上从水库淤积控制角度论述了三峡水库运用水位的选择。     

淮河防洪模型控制与检测系统

淮河防洪模型面积４０００ｍ２，应用计算机模型控制与检测系统，可自动地完成７处入流流量控制，互处尾水位控制，６个水闸的启闭控制，１１个行洪口门控制，可设定开门速度，模拟决口冲刷过程；水位采集３７点，流速采集３２点。主控计算机可对试验过程进行实时监控。经应用表明，该系统性能完善，控制与检测准确可靠，为淮河大型防洪模型这一复杂防洪体系试验研究的顺利进行提供了必要的手段。     

南宁市防洪堤防洪效益估算办法

在分析计算南宁市历次致灾洪水水位与淹没范围，淹没范围与经济损失之间的相关关系后，建立以物价增长指数和当地经济增长率为参数的合轴相关图表，若未来再遇致灾洪水，即可从曲线上读得致灾洪水造成的经济损失，供今后统计当年实际防洪效益参考     

大量程水位自动采集装置研究

大量程水位自动采集装置为三峡工程防洪调度而研制，采取量程转换方式实现５０ｍ水位变幅的测量，气泡压力式测压，采用压阻式压力传感器进行压力变送，步进式自动切换量程。为保证测量精度，合理吸收了国内外的最新技术，结合本国具体条件，解决了恒流补气，标准压力柱校证，阻容环节滤波等技术问题。应用先进的单片机系统使整个装置智能化，自动储存一年的测量数据，能与水情自动测报系统联机，达到高度的自动、自记、自报。经试验证明，本装置有较高的测量精度，９８．４％频率的误差不超过±２ｃｍ，符合有关国际、国内标准的要求。