InGaN蓝光与CdTe纳米晶基白光LED

报道了倒装焊InGaN蓝光LED与黄光CdTe纳米晶的复合结构。利用蓝光作为CdTe纳米晶的激发源,通过光的下转换机制,将部分蓝光转化为黄光,复合发射出白光。室温下正向驱动电流为10mA时,发光色品坐标为x=0.29,y=0.30。实验表明,该复合结构白光LED的一大优点在于,复合光的色品坐标几乎不随正向驱动电流大小变化,颜色稳定。     

一种基于模式的集中控制软件架构的设计

为适应各种控制管理类系统的发展,传统的软件设计开发方式已不能满足需求。为此,研究并设计了一种基于模式的集中控制系统软件架构。实际应用结果表明,该软件架构具有较强的可复用性和扩展性。     

开源事件库的对比和评估研究

恐怖事件、暴动事件、突发事件等社会事件对国家安全造成了极大的威胁,也给社会治理带来了新的挑战。事件库通过记录社会现实事件,能够在态势感知、风险预警、应急响应等社会安全应用中发挥重要作用。构建全球事件库的两个开创性项目ICEWS和GDELT最近获得了广泛关注,文中对这两个全球事件库进行了系统的分析、对比和评估,以期为事件库构建、事件抽取和事件图谱等领域提供帮助和参考。     

Micro-Service-Based Radio Access Network

The convergence of information, communication, and data technologies(ICDT) has been identified as one of the developing trends of the sixth generation(6G) network. Service-based architecture(SBA) as one of the promising information technology, has been preliminarily introduced into the fifth generation(5G) core network(CN) and successfully commercialized, which verifies its feasibility and effectiveness. However, SBA mainly focuses on the control plane of CN at present and the SBA-CN user plane ...     

Heterogeneous Catalysis of Ozone Using Iron–Manganese Silicate for Degradation of Acrylic Acid

Iron–manganese silicate (IMS) was synthesized by chemical coprecipitation and used as a catalyst for ozonating acrylic acid (AA) in semicontinuous flow mode. The Fe-O-Mn bond, Fe-Si, and Mn-Si binary oxide were formed in IMS on the basis of the results of XRD, FTIR, and XPS analysis. The removal efficiency of AA was highest in the IMS catalytic ozonation processes (98.9% in 15 min) compared with ozonation alone (62.7%), iron silicate (IS) catalytic ozonation (95.6%), and manganese silicate catalytic ozonation (94.8%). Meanwhile, the removal efficiencies of total organic carbon (TOC) were also improved in the IMS catalytic ozonation processes. The IMS showed high stability and ozone utilization. Additionally, H₂O₂ was formed in the process of IMS catalytic ozonation. Electron paramagnetic resonance (EPR) analysis and radical scavenger experiments confirmed that hydroxyl radicals (•OH) were the dominant oxidants. Cl⁻, HCO₃⁻, PO₄³⁻, Ca²⁺, and Mg²⁺ in aqueous solution could adversely affect AA degradation. In the IMS catalytic ozonation of AA, the surface hydroxyl groups and Lewis acid sites played an important role.     

A wideband low noise amplifiers design incorporating the CMRC circuitry

An impedance bandwidth enhancement technique for tuning a low noise amplifier (LNA) is presented. With the use of the compact microstrip resonant cell (CMRC) at the emitter pins of a bipolar junction transistor (BJT), the impedance bandwidth achieved is about 95%, for a simple single stage amplifier design. The LNA attains a gain of about 15 dB; also a low noise figure of 1.16 dB at 2.1GHz and an average noise figure of about 1.5 dB across the operation bands have been achieved.     

无线传感器网络中一种干扰避免的频段分配算法

路径干扰是无线传感器网络中的一个关键问题,干扰不但增加了信道竞争,而且会浪费宝贵的能量资源.文章利用现有radio的多频特性,提出了一个干扰避免的频段分配算法IAFA.IAFA根据可用的频段数量,将sink周围的不同区域进行划分,为每个区域指派不同的频段,位于特定区域的节点只能使用相应的频段进行通信,有效地降低了传输路径之间的干扰.此外,文章还基于IAFA给出了具体的路径构建和维护策略.详细的模拟试验验证了IAFA的性能.     

全程计数激光云高仪原理及实验研究

利用脉冲ＧａＡｌＡｓ二极管激光器进行了云高测量,提出了一种区别于传统的脉冲计数方法－单脉冲全程计数法。     

遥感图像的NSCT自适应阈值去噪方法

提出了一种基于非下采样Contourlet变换(NSCT)相结合的遥感图像自适应阈值去噪方法。通过小波估计被噪声污染遥感图像的噪声强弱,根据噪声的强弱以及NSCT的分解特点及系数所在邻域的特性,给出不同尺度不同方向的自适应阈值。仿真实验结果表明,与小波硬阈值、Contourlet硬阈值和基于非下采样Contourlet硬阈值去噪方法比较,该方法在提高了图像的峰值信噪比的同时也减少了Gibbs现象,图像视觉效果也得到明显的改善。     

分布式电源与微网管控技术综述

分布式电源具有投资省、方式灵活、与环境兼容等特点,是实现新能源利用的重要组成。为了降低分布式电源的不利影响而使光伏发电单元、风力发电单元、负荷、储能装置和控制装置等构成的小型电网-微电网,微网满足电能质量和供电可靠性、安全性。微电网管控技术是微电网稳定可靠运行的关键技术。基于此,文中重点介绍风力和光伏等分布式发电技术,以及基于分布式电源的微网管理控制技术。探讨该领域的研究热点和发展前景。