适合铝丝键合后热老化要求的金导体浆料

研究了一种适合铝丝键合后热老化要求的金导体浆料，性能达到使用要求。在金浆中添加了少量合金元素，并选用混合型粘结剂。对金导体铝丝焊后热老化失效机理以及添加合金元素的作用，进行了讨论     

挥发化合物发生-原子荧光法测定水中痕量锌

研究了挥发化合物发生-原子荧光光谱法测定环境水中痕量锌的可行性,着重优化了硼氢化钾与锌的反应条件,包括仪器和试剂条件.研究发现:适量镍离子和钴离子的存在能增强锌的荧光强度.在选定的最佳试验条件下,荧光强度与锌的质量浓度在0～1 200μg·L-1范围内呈线性关系.对标准空白进行11次测定,方法检出限为0.53μg·L-1;对400μg·L-1锌进行11次测定,其相对标准偏差(RSD)为3.0%,平行测定8份水样,RSD为3.6%;分析了4种不同水样并做加入不同浓度锌(Ⅱ)标准溶液时的回收率试验,结果在98%～104%之间.     

The impact of ATLAS and CMS single differential top-quark pair measurements at √s=8 TeV on CTEQ-TEA PDFs

By applying the Error PDF Updating Method,we analyze the impact of the absolute and normalized single differential cross-sections for top-quark pair production data from the ATLAS and CMS experiments at the Large Hadron Collider,at a center-of-mass energy of √s=8TeV,on the CT14HERA2 PDFs.We find that the top quark pair single differential distributions provide minor constraints on the CT14HERA2 gluon PDF when the nominal CT14HERA2 inclusive jet production data are included in the fit.Larger constraints on the gluon distribution are present when the jet data are removed(CT14HERA2mJ)and/or when increased weights are given to the top data in the CT14HERA2 fits.The weighted$t\bar t$data provide significant constraints on the CT14HERA2mJ gluon PDF,which are comparable to those obtained from inclusive jet production data.Furthermore,we examine the top quark mass sensitivity of the top-quark pair single differential distributions.     

广电播出收录系统改造升级研究分析及应用

随着全台节目制作向多样化方向发展,节目素材收录的需求量增加,收录任务相比以往愈加繁重,加之收录系统硬件老化,系统24小时不间断工作,导致现有系统运行极其不稳定,且频繁出现非常规故障。因此,将在此收录系统基础上进行分步式软件升级,对资源重新加以整合,对硬件设备进行更换,强化技术保障,提高收录系统的稳定性、时效性、安全性,满足各栏目部门对高品质、多样化电视节目需求。     

Advances and prospects in visible light communications

Visible light communication (VLC) is an emerging technology in optical wireless communication (OWC) that has attracted worldwide research in recent years. VLC can combine communication and illumination together, which could be applied in many application scenarios such as visible light communication local area networks (VLANs), indoor localization, and intelligent lighting. In recent years, pioneering and significant work have been made in the field of VLC. In this paper, an overview of the recent progress in VLC is presented. We also demonstrate our recent experiment results including bidirectional 100 Mbit/s VLAN or Li-Fi system based on OOK modulation without blue filter. The VLC systems that we proposed are good solutions for high-speed VLC application systems with low-cost and low-complexity. VLC technology shows a bright future due to its inherent advantages, shortage of RF spectra and ever increasing popularity of white LEDs.     

GaAs/AlGaAs多量子阱FET-SEED灵巧象元

将GaAs／AlGaAs多量子阱光探测器、光调制器与GaAs场效应晶体管（FET）混合集成,构成FET-SEED灵巧象元。光探测器和光调制器均为反射型自电光效应器件（SEED）,光源为骨子阱半导体激光器。测出的光输出Pout／光输入Pin特性表明,光输入信号对光输出信号有明显的调制作用,光输入信号较小的变化可以导致光输出信号较大的变化。     

近红外波段二维环形光子晶体

提出了带隙在近红外波段的环形光子晶体,主要有一系列环形的孔在背景材料为GaAs上构成.发现带隙不依赖于入射方向,很少的几排即可在透过谱上产生带隙.六角形构成的环形光子晶体的S波和P波的透过谱显示有一个完全带隙存在,带宽-带隙中心比率高达11%.     

应用于千兆以太网的1-Gb/s 零极点对消CMOS跨阻放大器

A zero-pole cancellation transimpedance amplifier（TIA）has been realized in 0.35μm RF CMOS technology for Gigabit Ethernet applications.The TIA exploits a zero-pole cancellation configuration to isolate the input parasitic capacitance including photodiode capacitance from bandwidth deterioration.Simulation results show that the proposed TIA has a bandwidth of 1.9 GHz and a transimpedance gain of 65 dB·Ωfor 1.5 pF photodiode capaci- tance,with a gain-bandwidth product of 3.4 THz·Ω.Even with 2 pF photodiode capacitance,the bandwidth exhibits a decline of only 300 MHz,confirming the mechanism of the zero-pole cancellation configuration.The input resis- tance is 50Ω,and the average input noise current spectral density is 9.7 pA/√ Hz.Testing results shows that the eye diagram at 1 Gb/s is wide open.The chip dissipates 17 mW under a single 3.3 V supply.     

OFDM系统中自适应调制和功率分配方案

为了提高Ka频段正交频分复用(OFDM)系统的频谱效率,提出了一种子带自适应调制和功率分配算法。该算法在目标误比特率下首先通过等功率分配确定各子带的初始信噪比大小和调制方式,并根据子带信噪比和调制方式的关系,迭代运算出最优的有效子带个数、调制方案和功率分配的比例关系。仿真结果表明,该算法提高了系统中低信噪比下的频谱效率。     

光子晶体垂直腔型表面发射和接收光电子器件

介绍了制作光子晶体垂直腔面发射激光器实验研究的主要内容,包括材料的光谱测试分析、氧化工艺以及制作光子晶体等,成功制作了波长在980nm附近的光子晶体垂直腔面发射激光器.在此基础上,采用高精度湿法腐蚀和感应耦合等离子体干法刻蚀技术,研究制作了基于垂直腔面发射激光器外延材料的光子晶体谐振腔增强型探测器.