DETERMINATION OF THE FAVORED PATTERN IN NEURAL SPIKE TRAIN WITH MONTE CARLO METHOD AND TEMPLATE METHOD

The modern neuroelectrical physiology indicates that there are certain patterns inneural spike train which appear more frequently than others.These favored patterns(FP)maybe related to the mechanism of neural information processing in central nervous system.Inthis paper,the quantized Monte Carlo method and template method used in favored patternrecognition are described.The Monte Carlo method determines favored patterns or the possiblefavored patterns,while the template method is used for choosing the FP from the candidates andcounting the number of the FP in the spike train.This work will be pursued for extracting theFP in some complicated spike train.     

真丝织物鞣酸染色性能的研究

为了得到真丝绸乌黑的颜色,对鞣酸染色和铁媒工艺进行了优选,并采用了络合促进剂。优选配方试样的各项牢度能达到要求,强度基本不变,增重率较高,悬垂性改善     

基于.Net Framework的N层分布式开发

.Net Framework推出的许多新技术(比如Web Service)为建立可维护、可扩展的站点，开发高效率、高伸缩性的应用程序提供了相对简单的解决方案。本文介绍如何利用这些技术结合SQL Server数据存储技术或Xml文档创建N层分布式应用程序、实现跨平台、跨Internet的应用集成。     

CTM和个人通信业务

本文介绍了ＥＴＳＩ最近提出的ＣＴＭ的概念;即基于ＤＥＣＴ技术在ＰＳＴＮ,ＩＳＤＮ的基础上结合ＩＮ技术实现个人通信业务,并给出了ＣＴＭ的网络结构,分析了ＣＴＭ个人通信业务的市场形势,最后介绍了ＣＴＭ在欧洲的发展及应用现状。     

Fabrication of ZnO nanorod-based hydrogen gas nanosensor

We report a first work on nanofabrication of hydrogen nanosensor from single ZnO branched nanorods (tripod) using in-situ lift-out technique and performed in the chamber of focused ion beam (FIB) system. Self-assembled ZnO branched nanorod has been grown by a cost-effective and fast synthesis route using an aqueous solution method and rapid thermal processing. Their properties were analyzed by X-ray diffraction, scanning electron microscopy, energy dispersion X-ray spectroscopy, transmission electron microscopy, and micro-Raman spectroscopy. These analyses indicate high quality ZnO nanorods. Furthermore, our synthesis technique permits branched nanorods to be easily transferred to other substrates. This flexibility of substrate choice opens the possibility of using FIB system for handling.

The main advantage of the proposed in-situ approach is a controllable lift-out procedure which permitted us to obtain a 90% success rate for building nanodevices. The fabricated nanosensor uses only single self-assembled ZnO branched nanorod (tripod) to gauge the 150 ppm H₂ in the air at room temperature. The hydrogen sensitivity is in the range of 0.6–2% depending on which two branches to use. The nanosensor has selectivity against other gases such as O₂, CH₄, CO and LPG, which shows sensitivity of <0.02%. The single ZnO branched nanorod sensor can operate at low power of <5 μW.     

高速客运通信系统中的动态资源预留

针对高速客运系统中用户频繁切换产生的大量资源开销,引入了组移动性概念,通过设置列车中继站,实现了车内用户的单用户切换方式.同时,针对大量用户同时切换至目标基站导致的基站拥塞,提出了基于基站协作的动态资源预留方案.即当前基站根据列车运行状态信息提前获知切换目标基站,并通告其资源需求,使其为车内用户预留资源.仿真结果表明列车业务量对系统性能产生了严重影响,采用动态资源预留方案,可以有效地提高列车用户的通信性能.     

雷达的杂波特性及杂波抑制技术

针对脉冲多普勒体制雷达,从杂波特性入手,就雷达的动目标检测和杂波抑制技术进行了讨论,并举例说明有关指标的计算。经过工程实践验证,采用大动态范围的线性接收机和FFT数字信号处理技术相结合的方案,能获得更高的改善因子和杂波抑制能力。     

基于光谱控制与色散优化的飞秒啁啾脉冲放大系统

飞秒激光在工业加工、精密测量、军事国防、科学研究等领域具有广阔的应用前景。报道了基于光谱控制与色散优化的高功率、高脉冲质量飞秒啁啾脉冲放大系统。利用与压缩器色散量相匹配的色散可调啁啾布拉格光纤光栅(CFBG)作为展宽器,通过微调CFBG色散量补偿系统的残余色散使整个系统的净色散趋于零;同时引入光谱滤波等手段,保证入射到主放大器之前的脉冲光谱形状不发生畸变,避免了放大过程中脉冲质量的劣化。最终获得了重复频率为50 MHz、平均功率为24 W、脉冲宽度为198 fs的高脉冲质量飞秒激光输出。     

基于氮气辅助一步溶液法的高质量钙钛矿太阳能电池光吸收层研制

有机无机杂化钙钛矿太阳能电池因其可调节的带隙、高吸收系数、宽吸收光谱、高载流子迁移率和长电荷扩散长度而被公认为是光伏领域的新希望。然而,采用一步溶液法所制备CH3 NH3 PbI3光吸收层薄膜为树枝状结晶,膜层覆盖率低,大大限制了光电转换效率的进一步提升。本文将氮气引入一步溶液法,通过发挥辅助结晶作用,获得了晶粒均匀且致密的钙钛矿薄膜,并显著提高了钙钛矿太阳能电池的光电转换效率。此外,系统研究了氮气起始时间、气体压强等因素对钙钛矿光吸收层表面形貌及太阳能电池光电转换效率的影响,实验证明氮气起始时间在2~5 s,氮气压强在0.4~0.8 MPa的宽操作窗口范围内,均可制备高质量CH3 NH3 PbI3光吸收层薄膜。     

准连续均匀光栅的接头对其光谱特性的影响

本文研究了以准连续均匀光栅代替线性啁啾光栅时的接头影响,利用耦合模理论和傅立叶频谱分析对接头的数目,大小及其影响进行了理论研究和数值模拟计算,并给出了接头和对其光谱特性影响的分析,计算结果。