改进匹配算法在LED粘片设备图像识别中的应用

在全自动LED粘片设备中,为了实时快速精确地识别出LED芯片,提出了一种新的金字塔-序贯相似性检测匹配算法,有机地结合了金字塔算法的快速性和序贯相似性检测匹配算法精确性的优点.该算法先采用金字塔算法对目标图像进行分层搜索,呈几何级的减少匹配次数,提高效率,然后用序贯相似性检测匹配算法在很小的区域内进行精匹配,达到准确定位的目的.目前,该算法已在VC 编程环境中编程实现,并在样机上得到应用,达到了工业应用的目的.     

一种高效率全pMOS结构AC-DC电荷泵

介绍一种全新高性能的AC-DC电荷泵.它采用全pMOS的结构和阈值电压消除技术,使得其效率和输出电压都大幅度的改善.测试结果表明在13.56MHz和lV的输入条件下,相对于传统的MOS二管结构,这种全pMOS电荷泵的效率提高了104%,而输出电压获得125%的提升.     

用Altium Desinger Winter 09实现传输线设计

文章简述了作者所做产品的情况,主要介绍了传输线的种类、板材的选择以及阻抗的计算,详细介绍了利用Altium Desinger Winter 09软件实现该产品的高速差分线的设计,并附带实际测试结果。     

基于超级电容下城轨车辆再生能量存储利用系统的研究

为适应不同电压等级的城市轨道交通供电系统,提出了一种新型模块化储能系统设计方案;以超级电容储能技术为基础,结合半桥型Buck/Boost双向DC/DC变换器,采用恒流反馈和飞渡电容均压控制策略,实现高效稳定的储能模块设计;最后利用MATLAB/Simulink建立了模块化储能系统的仿真平台,验证了储能模块设计的可行性以及控制策略的合理性。     

关于USAT多个主动式指令并行处理的研究

通用集成电路卡（UICC）的USAT（USIM应用工具箱）的应用为电信增值业务搭建了一个广阔的平台。针对当前3GPP标准中任意时刻均只允许最多一个主动式指令处理,不允许多个指令并行处理的情况,对多个主动式指令并行处理进行研究,包括终端侧和UICC侧应执行的操作,为USAT的后续发展提供参考。     

一种用于高T;无卤覆铜板的含氮酚醛树脂的制备方法

文章涉及一种新型含氮树脂的制备方法,替代传统的含氮树脂,使用溶剂充分溶解,作为含磷树脂的固化剂,可用于无卤覆铜板的生产,所得覆铜板的性能均一,T;180 ℃以上,耐热性T288 ℃约为10 min。     

Enhanced output power of (indium) gallium nitride light emitting diodes by a transparent current spreading-film composed of a disordered network of indium tin oxide nanorods

A thin film consisting of a disordered nanorod network of indium tin oxide (ITO) and conventional ITO films are fabricated on gallium nitride (GaN) based-light emitting diodes (LEDs) by electron beam evaporation. The surface morphologies are observed by scanning electron microscopy (SEM). The disordered nanorod network of ITO is grown in vacuum without oxygen. It can be applied directly on the LED as the current spreading film unlike other nanorods which require growth on a conductive layer. The transmittance, current–voltage characteristic, and the dependence of light output power on current are measured for disordered nanorod network ITO LEDs and conventional ITO LEDs, respectively. The measurement results indicate that the nanorod network provides a significant improvement in the light output power of GaN-based LEDs. The influence of the structure of ITO films on the light output power of GaN-based LEDs is discussed.     

Path planning using a mobile anchor node based on trilateration in wireless sensor networks

In wireless sensor networks (WSNs), many applications require sensor nodes to obtain their locations. Now, the main idea in most existing localization algorithms has been that a mobile anchor node (e.g., global positioning system‐equipped nodes) broadcasts its coordinates to help other unknown nodes to localize themselves while moving according to a specified trajectory. This method not only reduces the cost of WSNs but also gets high localization accuracy. In this case, a basic problem is that the path planning of the mobile anchor node should move along the trajectory to minimize the localization error and to localize the unknown nodes. In this paper, we propose a Localization algorithm with a Mobile Anchor node based on Trilateration (LMAT) in WSNs. LMAT algorithm uses a mobile anchor node to move according to trilateration trajectory in deployment area and broadcasts its current position periodically. Simulation results show that the performance of our LMAT algorithm is better than that of other similar algorithms. Copyright © 2011 John Wiley & Sons, Ltd.     

Experimental study on an S-band near-field microwave magnetron power transmission system on hundred-watt level

A multi-magnetron microwave source, a metamaterial transmitting antenna, and a large power rectenna array are presented to build a near-field 2.45 GHz microwave power transmission system. The square 1 m² rectenna array consists of sixteen rectennas with 2048 Schottky diodes for large power microwave rectifying. It receives microwave power and converts them into DC power. The design, structure, and measured performance of a unit rectenna as well as the entail rectenna array are presented in detail. The multi-magnetron microwave power source switches between half and full output power levels, i.e. the half-wave and full-wave modes. The transmission antenna is formed by a double-layer metallic hole array, which is applied to combine the output power of each magnetron. The rectenna array DC output power reaches 67.3 W on a 1.2 Ω DC load at a distance of 5.5 m from the transmission antenna. DC output power is affected by the distance, DC load, and the mode of microwave power source. It shows that conventional low power Schottky diodes can be applied to a microwave power transmission system with simple magnetrons to realise large power microwave rectifying.     

A Possible Reaction Pathway to Fabricate a Half‐Metallic Wire on a Silicon Surface

Based on first‐principles electronic structure calculations and molecular dynamics simulations, a possible reaction pathway for fabricating half‐metallic Mo‐borine sandwich molecular wires on a hydrogen‐passivated Si(001) surface is presented. The molecular wire is chemically bonded to the silicon surface and is stable up to room temperature. Interestingly, the essential properties of the molecular wire are not significantly affected by the Si substrate. Furthermore, their electronic and magnetic properties are tunable by an external electric field, which allows the molecular wire to function as a molecular switch or a basic component for information storage devices, leading to applications in future molecular electronic and spintronic devices.