基于SOPC/FPGA嵌入式的高频阻垢水处理器设计与开发

介绍高频电磁场阻垢技术原理,利用可编程芯片FPGA和SOPC嵌入式技术,开发带触摸屏高频阻垢水处理器系统,包括高频振荡信号的产生和大功率功放电路设计,带彩色触摸屏的人机交互界面及各种控制功能,给出系统的硬、软件设计,实现了系统智能化设计和实时监控功能。     

校园网监控技术的应用

采用网络实时监控,基于网络摄像机的技术优势,通过连入局域网,Internet或WIFI热点,使得远端用户轻松实现监控。可以在PC机或智能手机上使用浏览器,根据网络摄像机带的动态域名或者IP地址,对网络摄像机进行访问,实时监控目标现场,并对图像资料实时编辑和存储,另外还可以通过网络来控制摄像机的云台和镜头,实施全方位地监控。     

红外测温技术在浮法玻璃温度监控中的应用

介绍红外测温技术在浮法玻璃退火窑玻璃带温度场监控中的应用。设计了在线监控退火窑玻璃带温度系统,并对浮法玻璃退火窑玻璃带测温精度的影响因素及误差进行分析。     

CAN总线在逆变电源监控中的应用

为了满足逆变电源多模块监控的实时性、可扩展性、灵活性、可靠性等需求,对现场总线进行了研究和分析,系统采用CAN现场总线作为通信传输方式组建了监控网络,对带DSP控制器的逆变电源模块进行监控.在此基础上详细描述了操作站一侧监控方案的设计,重点介绍了CAN总线应用层协议的具体制定以及系统通信软件的设计和实现,实现了操作站与控制器的通信,完成了对逆变电源模块的监控功能.     

基于组播和嵌入式技术的远程监控系统

介绍了基于IP组播技术和嵌入式uClinux技术的嵌入式远程视频监控系统结构与实现,该系统重点实现了嵌入式技术和IP组播技术的整合应用以及对系统实时性的优化.系统的服务端由嵌入式系统实现,可完成多个地点对同一场景的监控及一点对多点的监控.     

带远程监控功能的高选择性直放站

介绍了一种带远程监控功能的移动通讯直放站,给出了提高选择性的设计方案,对移动通讯直放站的主要性能——低噪声和高线性提出了设计方法,最后给出了远程监控的实现方案。     

基于物联网技术的城市路灯无线网络监控系统

从制约路灯监控发展的关键环节———数据通信出发,将先进的物联网技术应用于城市路灯监控领域,设计了一套基于ZigBee和GPRS技术的无线监控网络,在单个路灯中嵌入无线监控终端,实现了路灯的单灯监控。该系统可以实现城市照明的精确化,智能化管理,大幅降低城市照明的能源消耗和管理成本,实现绿色照明。     

网络视频监控系统设计与实现

本文主要针对网络视频监控概念、技术原理、系统设计过程、行业应用等方面进行了分析和探讨,介绍了网络视频监控系统的基本概念以及行业应用和市场前景,剖析了网络视频监控系统的组成结构,分析了网络视频监控系统的分析和设计思路。事实证明通过借助于网络信息技术、多媒体技术、网络存储等技术可以应用于网络视频监控系统的设计和实现,实现建设平安城市的目标。     

基于．NET的网络视频监控接口的设计与实现

目前如何在网络上有效实时传输监控信息是视频监控业内普遍关注的热点,为了更好的实现网络视频监控的各个业务逻辑功能,本文提出了基于．NET的网络视濒监控接口的设计与实现。本文首先介绍了P／Invoke和ActiveX技术,接着介绍了怎样利用P／Invoke和AcdveX技术实现对接口的设计,然后介绍了怎样成功实现对接口的引用,最终达到实现网络视频监控业务逻辑层中实时监控、录像回放、系统配置、日志管理等几个模块的功能的目的：     

硬盘播出系统的设备监控

1 播出系统的监控概述 播出系统是电视台最重要的环节之一,高可靠性与高播出信号质量是播出机构对播出系统提出的要求.播控系统从手动播出到自动播出、从模拟系统到数字系统、从标清到高清、从带基到盘基、从纯AV系统到AV与IT融合的系统,不断演进,系统监控的需求愈发强烈,监控的要求与要素也不断变化.计算机技术、网络技术的迅猛发展,AV与IT技术的不断融合给新的播控系统监控实现带来了可能.笔者根据自己的了解对播控系统的设备监控谈一些想法,对现有的一些产品与技术作简要介绍和分析.     

用光监控通道实现WDM网络的管理

比较了WDM网络特征信息的几种传输方法,给出了适合在监控信道中传输的开销内容。在此基础上,以城域WDM网络为例,给出了OSC中各种开销的处理过程和城域WDM网中OSC子系统的实现实例。为了适应智能光网络管理的需要,未来的光监控通道需要大约100Mbps的带宽。     

Metal–Organic Hybrid Interface States of A Ferromagnet/Organic Semiconductor Hybrid Junction as Basis For Engineering Spin Injection in Organic Spintronics

Electrons in organic semiconductors (OSC) possess remarkably long spin relaxation times. Hybrid spintronic devices that combine OSC with ferromagnetic (FM) substrates are therefore expected to provide a route to devices with improved and new functionalities. A crucial role is played by the FM‐OSC interface which governs the spin injection into the OSC. Using spin‐resolved photoelectron spectroscopy and ab initio calculations we study here such possible injection channels in metal phthalocyanines (MPc). We report the first direct observation of the successful engineering of different spin‐selective hybrid interface states at the Fermi level of a FM‐OSC hybrid junction only by changing the central metal atom of a MPc. Our results demonstrate that tailoring the chemical interaction at the FM‐OSC interface is a promising way to modify the spin injection channels and thus the spin injection capability.     

A Co‐design Study of Filters and Oscillator for Low Phase Noise and High Harmonic Rejection

In this paper, we present a novel oscillator (OSC) design. Bandpass filters, which can suppress harmonics, are incorporated into a co‐design with an OSC to improve the OSC phase noise and harmonic rejection. The proposed OSC/bandpass filter co‐design achieves a phase noise of ?130.1 dBc/Hz/600 kHz and harmonic rejection of 37.94 dB and 40.85 dB for the second and third harmonics, respectively, as compared to results achieved by the OSC before co‐design of ?101.6 dBc/Hz/600 kHz and 21.28 dB and 19.68 dB. Good agreement between the measured and simulated results is achieved.     

The role of the electrode configuration on the electrical properties of small-molecule semiconductor thin-films

This paper presents a systematic analysis of the electrode configuration influence on the electrical properties of organic semiconductor (OSC) thin-film devices. We have fabricated and electrically characterized a set of planar two-terminal devices. The differences in I-V characteristics between the top and bottom contact structures are presented and analyzed. Top-contact configurations have a linear current vs. electric field behavior, while the bottom-electrode devices display a transition from ohmic to space-charge-limited conduction regime. The transition is temperature- and thickness-dependent. Finite-element calculations show that when the OSC film is connected using top electrodes, the current flows through the OSC bulk region. On the other hand, the bottom-electrode configuration allows most of the current to flow near the OSC/substrate interface. The current probes interfacial states resulting in a space-charge conduction regime. The results shed some light on the so-called “contact effects” commonly observed in organic thin-film transistors. The findings presented here have implications for both the understanding of the charge transport in OSC films and the design of organic semiconductor devices.     

Effects of polarons and bipolarons on spin polarized transport in an organic device

A polaron–polaron interaction model is suggested to study the spin injection and transport in an organic semiconductor (OSC) device. The evolutions of spin polarons and spinless bipolarons are calculated from the drift-diffusion equations, in which both the polaron–bipolaron transition and the spin-flipping of a spin polaron are included. Then the spin polarized current is obtained. It is found that the polarons are responsible for the spin polarized transport in an OSC. Different from the case in a normal inorganic semiconductor, spinless bipolarons will affect the spin polarization of the OSC device. Finally, effects of the spin-flip time and the mobility of the carriers on the spin polarization in an organic device are discussed.     

Accelerated iterative transmission CT reconstruction using an ordered subsets convex algorithm

Iterative maximum likelihood (ML) transmission computed tomography algorithms have distinct advantages over Fourier-based reconstruction, but unfortunately require increased computation time. The convex algorithm [1] is a relatively fast iterative ML algorithm but it is nevertheless too slow for many applications. Therefore, an acceleration of this algorithm by using ordered subsets of projections is proposed [ordered subsets convex algorithm (OSC)]. OSC applies the convex algorithm sequentially to subsets of projections. OSC was compared with the convex algorithm using simulated and physical thorax phantom data. Reconstructions were performed for OSC using eight and 16 subsets (eight and four projections/subset, respectively). Global errors, image noise, contrast recovery, and likelihood increase were calculated. Results show that OSC is faster than the convex algorithm, the amount of acceleration being approximately proportional to the number of subsets in OSC, and it causes only a slight increase of noise and global errors in the reconstructions. Images and image profiles of the reconstructions were in good agreement. In conclusion, OSC and the convex algorithm result in similar image quality but OSC is more than an order of magnitude faster.     

Effect of Co permeation on spin polarized transport in a Co/organic semiconductor (OSC) structure

Co atoms will permeate into the soft organic material to form a magnetic permeated sublayer (MPS) during the fabrication of an organic spin device, such as Co/OSC/LSMO. We considered the OSC as a two-sublayer structure of MPS and pristine OSC, and then established a dynamic spin-diffusion equation to study the effect of MPS on the spin current polarization and the magnetoresistance of the device. It was found that the MPS will change the spin transport due to its different spin-flip time and mobility from that in the pristine OSC. The splitting of spin-flip times will be favorable to the spin polarization transport. Mobility of spin polarons in the MPS will be reduced due to the scattering of the Co atoms, which will weaken the spin polarization. For a given device, effect of the thickness of the MPS on the spin polarization is discussed. Finally, we calculated the magnetoresistance of a Co/OSC/LSMO device. A theoretical result which is consistent with the experimental data was obtained.     

The effect of charge extraction layers on the photo-stability of vacuum-deposited versus solution-coated organic solar cells

Organic solar cells (OSCs) are studied for their photo-stability in inert atmosphere. Polymer solar cells with a bulk heterojunction (BHJ) of poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) are contrasted with small molecule solar cells with a BHJ of chloroindium phthalocyanine (ClInPc) and C₆₀-fullerene. A series of charge extraction layers at the hole and electron collecting contacts are examined for their role in OSC performance and stability. The inter-compatibilities of these extraction layers in vacuum-deposited small molecule OSCs (SM-OSCs) versus solution-coated polymer OSCs (P-OSCs) are explored. Through photo-stability studies, we show that interfacial extraction layers are necessary to avoid contact photo-degradation, which otherwise leads to strong reductions in OSC efficiencies. We also highlight certain extraction layer combinations that result in strong inter-electrode degradation, and we discuss incompatibilities in extraction layers among SM-OSCs versus P-OSCs. Our results suggest that the presence of excitons at the organic-electrode interface likely plays a critical role in contact photo-degradation. By minimizing contact photo-degradation, which dominates the majority of short-term OSC degradation, a new avenue for studying OSC stability behavior and opportunities to focus on other losses in OSCs become possible.     

Vertical Phase Separation in Small Molecule:Polymer Blend Organic Thin Film Transistors Can Be Dynamically Controlled

Blending of small‐molecule organic semiconductors (OSCs) with amorphous polymers is known to yield high performance organic thin film transistors (OTFTs). Vertical stratification of the OSC and polymer binder into well‐defined layers is crucial in such systems and their vertical order determines whether the coating is compatible with a top and/or a bottom gate OTFT configuration. Here, we investigate the formation of blends prepared via spin‐coating in conditions which yield bilayer and trilayer stratifications. We use a combination of in situ experimental and computational tools to study the competing effects of formulation thermodynamics and process kinetics in mediating the final vertical stratification. It is shown that trilayer stratification (OSC/polymer/OSC) is the thermodynamically favored configuration and that formation of the buried OSC layer can be kinetically inhibited in certain conditions of spin‐coating, resulting in a bilayer stack instead. The analysis reveals here that preferential loss of the OSC, combined with early aggregation of the polymer phase due to rapid drying, inhibit the formation of the buried OSC layer. The fluid dynamics and drying kinetics are then moderated during spin‐coating to promote trilayer stratification with a high quality buried OSC layer which yields unusually high mobility >2 cm² V^?1 s^?1 in the bottom‐gate top‐contact configuration.     

一种新型微秒级脉冲形成电路的分析和设计

由于脉宽调制器对振荡器频率要求越来越高,文中设计了一种新型的可产生高频脉冲的振荡电路,分析了它的工作原理,提出了该振荡器的关键参数确定的方法,并利用pspice仿真器对该电路进行了模拟与仿真,结果表明该电路可产生频率达1MHz,脉宽为零点几微秒的脉冲,符合了当前脉宽调制器对振荡器频率的要求.