TFT阵列基板的电容充电电路的设计

液晶显示器尺寸越来越大,液晶栅极启动信号持续时间变短,液晶电容和存储电容的充电时间也随之减少,导致对液晶电容和存储电容充电不充分,造成横向微弱亮线的产生,使得画面品质下降。本文设计出TFT阵列基板电容充电电路,在当前行像素显示时,对下一行像素预充电,解决了液晶电容和存储电容充电不充分的问题。     

离网型风光互补系统蓄电池充电控制研究

针对离网型风光互补系统蓄电池组充电电流暂态冲击较大、充电曲线不平稳的问题,在比较分析现有蓄电池充电控制方法的基础上,选择使用先恒流后恒压的两阶段充电方式,并设计两个PID环切换的控制算法进行这两个阶段的平稳充电。仿真研究和硬件系统实验分析结果均表明：基于两个PID环切换的充电控制算法可以实现离网型风光互补系统蓄电池组的平稳充电,两个阶段的充电过程中充电电流平稳、纹波小,系统响应速度快,改善了蓄电池组的充电曲线,有望提高蓄电池的使用寿命。     

用于音乐作品版权保护的数字音频水印算法

提出了一种用于音乐作品版权保护的数字音频水印嵌入算法，该算法首先将视觉可辨的二值水印图像降维成一维水印序列并进行随机置乱，再从原始数字音频信号中随机选取采样数据并进行快速傅立叶变换(FFT)，最后结合人类听觉系统(HAS)掩蔽特性选取绝对值较大的FFT系数嵌入水印信息。仿真实验表明：该数字音频水印嵌入算法不仅具有较好的透明性，而且对诸如叠加噪声、有损压缩、低通滤波、重新采样、重新量化等攻击均具有较好的鲁棒性。     

基于AT89S52的镍镉充电电池智能管理系统设计

镍镉充电电池作为一种碱性电池,对使用、管理和维护有特殊要求,如果管理不善、使用不当、维护不及时,很容易导致电池老化、失效甚至报废。针对部队、厂矿大量使用并集中存放的不同种类镍镉充电电池,运用单片微型计算机控制技术,设计了电池智能管理系统,对镍镉充电电池进行状态自动检测、充放电管理、性能维护等智能化管理。通过对镍镉充电电池的自动管理,有效消除镍镉充电电池使用管理上的盲目性和随意性,提高镍镉充电电池的使用效能,延长镍镉充电电池的使用寿命。     

An FFT-based signal identification approach for obtaining the propagation constants of the leaky modes in layered media

We propose to find the propagation constants of modes in layered media by means of signal identification methods. To this effect we employ Cauchy's theorem, conformal mapping and Fast Fourier Transform (FFT) techniques to generate relevant Hankel moments, afterwards to be processed with selected signal identification algorithms. The method, terminated by a few Newton steps, provides a batch of highly accurate roots in appropriate disks or half-disks.     

残影不良分析及改善对策研究

通过对大量残影不良样品进行分析,找到了残影不良产生的原因,并基于分析结果设计了改善残影的实验。通过分析发现:残影不良产生的原因是彩膜侧像素与黑矩阵之间的段差过大,在摩擦工程时段差过大区域形成了摩擦弱区,摩擦弱区内的液晶分子配向较弱,导致不良产生。为降低残影不良进行实验,结果显示:在彩膜侧加覆盖层可以有效降低残影不良的发生率,但不适用于量产;通过采用高预倾角的配向膜材料,同时控制配向膜工程到摩擦工程的时间,可使残影不良发生率由28.2%降低至0.2%,为企业的稳定高效生产奠定了基础。     

Low threshold and tunable all-optical switch using two-photon absorption in array of nonlinear ring resonators coupled to MZI

In this paper a novel structure based on Mach-Zehnder Interferometer (MZI) and an array of nonlinear ring resonators for all-optical switching including very low threshold, fast and all-optically tunable is presented. In this proposal, an array including N ring resonators is coupled to one arm of MZI to introduce the required nonlinear phase shift to switching. Also, two-photon absorption phenomenon is used and will be proposed as another alternative for manipulation of optical switching properties. The proposed idea needs small chip area (∝1/Ntraditional cases) for implementation. We show that the switching threshold intensity can be decreased with increase of N, decrease of the coupling coefficient and increase of the two-photon absorption coefficient. In this structure with traditional optical fibers with the low nonlinear index of refractions and using an array including 15 ring resonators with 6 mm diameter for each rings only 3 mW for the switching threshold power is required. Also, using erbium-doped fiber for implementation of the rings with the high nonlinear index of refractions and five ring resonators including 0.3 mm diameter, the switching threshold power can be reduced to μW level. If the nonzero two-photon absorption coefficient is considered, the switching threshold will be very smaller than the above-mentioned values. We show that with changing the optical amplifier gain the switching threshold can be tuned. So, the proposal can be used as a functional block for the integrated optical switch with very small and tunable threshold.     

A Novel Flexible Hybrid Battery–Supercapacitor Based on a Self‐Assembled Vanadium‐Graphene Hydrogel

A novel flexible hybrid battery–supercapacitor device is proposed consisting of high specific surface area electrodes paired with an electrolyte, which contains a redox species that can exist in more than two oxidation states. The two initially equal half‐cells of the device consist of a reduced graphene oxide hydrogel which encapsulates vanadium ions, synthesized with a single‐step method. During charge, the oxidation state of the vanadium ions changes, resulting in two half‐cells with different potentials which considerably increases the energy density. The achieved maximum capacity of more than 225 mAh g^?1 is roughly eight times higher than that of comparable graphene hydrogel supercapacitors without vanadium content, but the potentiostatic charging time is only double. Operated as a supercapacitor, it retains 95% of the initial capacitance over 1000 cycles. As battery, the losses are more significant, retaining around 50% of the initial capacity. However, these losses during battery operation can be almost entirely restored by electric measures. The vanadium ion addition also improves the self‐discharge characteristics of the device. Moreover, the self‐discharge does not permanently damage the hybrid device since both half‐cells initially consist of the same vanadium graphene hydrogel and discharging resets it to initial conditions.     

一种无线充电5号电池的设计与研究

本文将无线充电技术与5号电池相结合,设计了一种无线充电5号电池,并利用太阳能作为充电电力来源.无线充电接收电路与5号电池的整合是本设计的核心部分,而与其配套设计的太阳能无线充电系统提高了本设计的节能环保性.