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关键词： 货车车辆检修   轮对测量   激光位移传感器   图像传感器  

摘要： 本文主要介绍货车车辆检修中轮对几何尺寸的测量方法，激光传感器和图像传感器的基本工作原理及在轮对检测中的应用。

关键词： 传感器技术   SI图像   FSI   半导体制造工艺   图像传感器   展望   像素尺寸   聚光技术  

摘要： 过去30年中,聚光技术和半导体制造工艺的创新对图像传感器像素技术产生了重大影响。例如,最初便携式摄像机采用的图像传感器为25微米像素,而如今,手机相机中传感器的像素尺寸只有1.4微米。

关键词： 原位测试   现场监测   电子技术   传感器技术   智能化  

摘要： 目的研究现代岩土工程中原位测试技术的应用与发展.方法在新的原位测试方法中,利用便携式可变能轻型动力触探仪来测试路基以及软土地基土动阻力变化情况,采用声波测试法测得路基的剪切波速,利用改进后的压力-膨胀量曲线法,进行原位地基土的膨胀力试验.结果原位测试技术应广泛应用现代电子技术、传感器技术和计算机技术的最新成就,使测试自动化、数据采集、数据处理更加智能化,减少人为因素对测试结果的影响.结论对于一些新的应用还未成熟的原位测试方法,要加大科研试验投入,多进行原位测试试验数据积累,并与已有的原位测试手段对比,尽快形成相关规范.

关键词： 无线网络传感器   温度检测   振动监测   Zigbee   危险源监测  

摘要： 本文介绍了一种基于无线网络传感器技术的危险源的实时监控系统,系统由DS18B20温度传感器、涡流振动传感器、LPC900系列低功耗MCU、ZigBee无线模块等组成,主要实现对危险源的温度检测和振动监测,并将其温度和振动信号的实时状态经ZigBee模块传送给上位机。本文对系统的原理、无线网络传感器的电路原理图和程序设计、无线通信模块中的信息帧格式和无线网络传感器的组网设计做了详细介绍。

关键词： 接近传感器   西门子   业务   并购   工厂自动化   电感式传感器   光电传感器   传感器技术  

摘要： 世界领先的电气传感器和本安防爆元件制造商倍加福于2010年2月成功收购西门子接近传感器业务，以此扩充了电感式传感器以及光电传感器的产品线，同时进一步提高了倍加福在工厂自动化超声波传感器技术上的市场地位。2010年2月27日，倍加福在曼海姆与地处纽伦堡的西门子工业自动化部签署了一项关于倍加福收购西门子工厂自动化接近开关业务的并购协议。

关键词： 物联网   RFID技术   传感器技术   纳米技术   智能终端   目标网   NGN   ITU  

摘要： 根据NGN目标网及泛在网创新与融合的基本思想，物联网概念与定义均在扩展，即如ITU在物联网报告中提出的物联网在任何时刻、任何地点、无所不在的刚络和无所不在的计算的发展愿景，除RFID技术外，传感器技术、纳米技术、智能终端等技术将得到更广泛的应用。

关键词： 在线监测技术   局部放电   变压器   实时在线监控   神经网络理论   传感器技术   信息分析   监测精度  

摘要： 局部放电在线监测主要对变压器实施实时在线监控,随着传感器技术、神经网络理论及信息分析技术的发展,将使得变压器局部放电在线监测的灵敏度及监测精度越来越高。

关键词： BIOSENSORS   MEDICAL supplies   TECHNOLOGICAL innovations   MOLECULAR microbiology   METABOLITES   ANTIBIOTIC residues   PATHOGENIC microorganisms   PHOTOMETRY   WATER pollution   ENZYMES   ELECTRON diffusion  

摘要： The article discusses the application of biosensor to detect molecules with high selectivity on the basis of molecular recognition. Biosensors detect pathogens or toxic metabolites, determine drug residues in food and antibiotics and detects pesticides or water contaminants. Moreover, biosensors are applicable to photometric such as high refractive index glass surface, electrochemical for enzymatic catalysis to consume electrons and redox enzymes particularly on elastic properties of the crystal in the resonance frequency of binding signal.

关键词： wireless smart sensor network   cable-stayed bridge   structural health monitoring   modal identification   cable tension estimation  

摘要： This paper analyses the data collected from the 2(nd) undo Bridge, a cable-stayed bridge in Korea that is a structural health monitoring (SHM) international test bed for advanced wireless smart sensors network (WSSN) technology. The SHIM system consists of a total of 70 wireless smart sensor nodes deployed underneath of the deck, on the pylons, and on the cables to capture the vibration of the bridge excited by traffic and environmental loadings. Analysis of the data is performed in both the time and frequency domains. Modal properties of the bridge are identified using the frequency domain decomposition and the stochastic subspace identification methods based on the output-only measurements, and the results are compared with those obtained from a detailed finite element model. Tension forces for the 10 instrumented stay cables are also estimated from the ambient acceleration data and compared both with those from the initial design and with those obtained during two previous regular inspections. The results of the data analyses demonstrate that the WSSN-based SHM system performs effectively for this cable-stayed bridge, giving direct access to the physical status of the bridge.

关键词： Bacterial RNase P   RNA-protein interaction   Magnetic detection   Magnetic beads  

摘要： A magnetic sensor technique was applied to analyze the interaction of immobilized bacterial RNase P protein and 3'-biotinylated RNase P RNA bound to streptavidin-coated magnetic beads. Our measurements with three types of beads from different suppliers resulted in K-d values of about 1-2 nM (at 4.5 mM Mg2+ and 150 mM NH4+) for Escherichia coli RNase P RNA and protein, consistent with previous analyses using different techniques. We further measured affinity of the E. coli RNase P protein to chimeric RNase P RNA variants, consisting of an E. coli specificity domain and an engineered archaeal catalytic domain. A "bacterial-like" 1-bp insertion and 2-nt deletion in the helix P2/P3 region largely improved affinity, providing independent evidence that these elements are crucial for interaction of the two RNase P subunits. Moreover, our study documents that the properties of the streptavidin-coated magnetic beads decide on success or failure of the technique. (C) 2010 Elsevier Masson SAS. All rights reserved.