Detecting molecular vibrational modes of side chains and endpoints in nanoscale proteins with graphene plasmon

Monitoring the chemical and structural changes in protein side chains and endpoints by infrared(IR)spectroscopy is important for studying the chemical reaction and physical adsorption process of proteins.However, the detection of side chains and endpoints in nanoscale proteins is still challenging due to its weak IR response. Here, by designing a double layered graphene plasmon sensor on MgF_2/Si substrate in the IR fingerprint region, we detect the vibrational modes in side chains and endpoints(1397 cm~(-1) and 1458 cm~(-1)) of monolayer protein. The sensor could be applied on biochemistry to investigate the physical and chemical reaction of biomolecules.     

贵州电视台数字播控中心设计与实施

贵州电视台建成的8频道全数字、全硬盘、全自动网络化数字播控中心包括视音频系统、视频服务器系统、软件控制系统、监控系统、同步系统、时钟系统、供电系统。本文对各部份设计思路、设备选型及实施体会进行了介绍。     

12 W high power InGaAsP/AlGaInP 755 nm quantum well laser

High power laser diodes(LDs) with a lasing wavelength between 700 and 780 nm have great potential in various medical uses. Here, we report our recent efforts in developing an InGaAsP/AlGaInP-based commercial high power edge-emitting LD, which has 755 nm emission peak with a world-record continuous wave output power of 12.7 W, the highest reported so far. The lack of Al atoms in the active region significantly lowers the chance of catastrophic optical damage during high power laser operation. Meanwhile, with an accumulated 3800 h running time, our ongoing aging tests reveal excellent reliability of our devices.     

Ultra-compact graphene plasmonic filter integrated in a waveguide

Graphene plasmons have become promising candidates for deep-subwavelength nanoscale optical devices due to their strong field confinement and low damping. Among these nanoscale optical devices, band-pass filter for wavelength selection and noise filtering are key devices in an integrated optical circuit. However, plasmonic filters are still oversized because large resonant cavities are needed to perform frequency selection. Here, an ultra-compact filter integrated in a graphene plasmonic waveguide was designed, where a rectangular resonant cavity is inside a graphene nanoribbon waveguide. The properties of the filter were studied using the finite-difference time-domain method and demonstrated using the analytical model. The results demonstrate the band-pass filter has a high quality factor(20.36) and electrically tunable frequency response. The working frequency of the filter could also be tuned by modifying the cavity size. Our work provides a feasible structure for a graphene plasmonic nano-filter for future use in integrated optical circuits.     

核电站反应堆松脱件模拟撞击技术研究

核电站松脱件撞击模拟系统可在反应堆系统管壁或器壁上制造出松脱件撞击信号,用以在线调试和检测电站松脱部件监测系统,保证核电站的正常运行.利用电容放电特性,产生高能量的脉冲电流;基于电磁效应原理,将脉冲电能转换为机械动能,实现了核电站松脱件撞击模拟技术;通过试验验证,利用该技术可产生0~100g的核电站松脱件模拟撞击信号.     

基于光电倍增管的光子计数仪设计

在医学检验中,体内多类激素水平及其微量代谢产物、药物及代谢产物、维生素类及疾病相关抗原的分析测定总计可达几十至上百种之多.但由于其检测灵敏度要求较高,一般免疫技术难以达到.因此,长期以来一直使用放射免疫法.这不仅对操作人员的健康造成了危害,其废弃物对环境也有严重的污染.因此需要特殊的防护及废物处理系统;同时,由于受到自然衰变的限制,其试剂不便长期储存和运输,因而大大地限制了它的发展.     

ICP刻蚀优化及在多波长分布反馈式激光器阵列中的应用北大核心CSCD

研究了CH_4/H_2/Cl_2感应耦合等离子体刻蚀技术中的关键工艺参数对刻蚀性能的影响。通过对CH_4/H_2/Cl_2气体流量及流量比的优化,在自行设计的InP/InGaAlAs多量子阱结构的外延片上,实现了一种高速低损耗、形貌良好的Bragg光栅制作方法。基于优化后的工艺参数制作了多周期结构的λ/4相移光栅,实现了单片集成的四波长1.3μm分布反馈式激光器阵列。该激光器阵列中激光器的阈值电流典型值为11mA,外微分效率可达0.40 W/A,且实现了边摸抑制比大于46dB的稳定的单纵模激光输出。研究结果表明优化后的ICP光栅刻蚀工艺具有良好的刻蚀精度和可靠性。     

有线网络综合业务运营支撑系统Web服务器操控过程中需要注意把握的若干问题

随着广电网络新业务的发展及增值业务的不断涌现,为了更好满足业务多样化的发展需求,公司的网络综合业务运营支撑系统需要不断完善.作为综合业务运营支撑系统的核心Web层中间件由TongWeb来承载,其功能尤显非常重要.本文简述TongWeb的工作原理及操控过程中需要注意把握的若干问题.     

单分子光谱检测法的新进展

自上世纪90年代以来，单分子检测已经取得了巨大的进步。它提供了大量非平衡体系中个体或平衡态脉动体系的信息，而这些信息是无法从传统的统计测量中获得的。本文主要介绍近10年来，单分子光谱检测技术从低温到室温、从非溶液介质到水溶液、从固体到活细胞、从有机染料分子到纳米粒子等方面的进展情况。     

浅析有线电视网络的光缆接续与测试

本文从作者实际工作出发，详细阐述了有线电视网络的光缆接续与测试过程，结合自己多年的工作经验，总结出较为详尽操作步骤和规范，尤其重点阐述了现场实际操作过程的若干注意事项，为从事电视网络光缆接续与测试工作的同仁们提供参考。