教学课程资源库 更多>>

关键词： 传感器技术   飞机故障诊断  

摘要： 主要阐述了飞机故障诊断领域中应用的先进传感器技术,如:光纤传感器、无线传感器、微机电传感器、压电传感器及多传感器融合等原理、特点以及它们在故障诊断领域中的具体应用情况。

关键词： 直驱风力发电系统   无速度传感器   模型参考自适应系统   永磁同步发电机   Popov超稳定理论  

摘要： 针对直驱风力发电系统(DDWPS)中测速码盘容易受到干扰的问题提出了一种模型参考自适应系统(MRAS)无速度传感器永磁同步发电机(PMSG)控制方案。选择PMSG本身作为参考模型,电机的电流模型为可调模型,可调模型中的电流和转速量为待估计参数,根据利用Popov超稳定理论得到的自适应律实时地调节可调模型中的电流值,使其与电机定子的实际电流矢量误差收敛于零,同时使可调模型中的转速逼近实际值。利用估计到的转速进行永磁直驱风力发电机的电流闭环矢量控制,电网侧采用PWM整流器的有源逆变工作方式实现直驱系统背靠背变流器的并网发电。给出了DDWPS背靠背变流器的详细控制框图。通过仿真和实验验证了基于MRAS的转速估计方法及DDWPS背靠背变流器控制方案的正确性和可行性。

关键词： Carbon nanotubes  

摘要： Methods of formation of thin film structures and sensor elements based on carbon nanotubes have been developed. Methods of integration using deposition from solutions, probe micromechanics and the electrokinetic positioning of nanotubes providing compatibility with traditional microelectronic technology, are suggested. Peculiarities of the parallel integration of carbon nanotubes in the process of formation of thin films, networks, and individual conduction channels are revealed. © 2009 Pleiades Publishing, Ltd.

关键词： Calixarene   Metal cations   Complexation   Sensor   Supramolecular chemistry  

摘要： In this article unique sensor and extraction properties of p- morpholinomethylcalix[4]arene (3) has been explored. In the first phase, we have studied the complexation/sensing behavior of ligand 3 toward essential as well as beneficial metals such as Cu2+, Co2+ and Ni2+ by UV-vis and fluorescence techniques. Secondly, we have applied Pederson method for the extraction of these metal cations using their picrates in two-phase extraction experiments. From the results it has been deduced that 3 could serve as a versatile sensor for the detection of metal cations used in the experiments. Besides this, it may be employed as an ionophore for significant extraction of these metal ions in separation/transportation systems. (C) 2009 Elsevier B.V. All rights reserved.

关键词： 生物传感器   发酵工业   环境监测  

摘要： 简述了生物传感器近年来的研究与应用,对其发展前景及市场化作了预测及展望。生物传感器因其专一性好、易操作、设备简单、测量快速准确、适用范围广等特点,在发酵工业、环境监测、食品监测、临床医学等方面得到广泛的应用。随着固定化技术的发展,生物传感器在市场上越来越具有竞争力。

关键词： 武器装备综合保障   传感器技术   装备保障   保障系统   电源供电   信息   标准  

摘要： 在装备保障中，装备的状态、信息的获取都要经过传感器转换为容易传输和处理的信号，传感器成为装备综合保障中最基础也是最重要的一环；能否及时、准确的通过传感器获取信息，直接关系到能否为保障系统决策方提供正确的信息参考，也关系到能否及时有效的实现装备的综合保障；各国制定了相关的标准，如英国DEFSTAN00-970标准、美国MIL-PRF－49506标准等均对综合保障中的传感器进行了明确的规定，包括传感器的型号，安装，电源供电等部分。

关键词： 形体测量   多传感器技术   重复性   再现性  

摘要： 基于多传感器技术,提出了一种将接触式和非接触式传感器集成到坐标测量机上研究微孔几何参量测量的理论和方法,可对喷墨打印机啧嘴、生物医学仪器孔、燃气涡轮叶片的致冷喷口和柴油机喷油器喷孔等微孔进行实时测量。介绍了系统的组成和测量原理,讨论了微孔测量步骤。实验中,以直径0.16 mm、深0.9 mm的三个柴油机喷油嘴喷孔做测试,根据测量结果,分析了微孔的圆柱度、直径、圆度、直线度和锥度五个特征参量,并对测量系统的重复性和再现性进行了分析,对于微孔加工过程中的质量控制具有指导作用。

关键词： 钢液   定氧传感器   敏感元件   应用  

摘要： 在炼钢过程中,钢液快速定氧传感器广泛的用于控制钢液的氧含量。综述了钢液快速定氧传感器的研究现状,重点阐明:钢液快速定氧传感器关键部件氧敏感件氧化锆固体电解质的结构特征、导电机理、制备工艺等。并且介绍了钢液快速定氧传感器技术目前存在的问题、发展趋势及应用前景。

关键词： 传感器   信息技术   量子力学   生物传感器  

摘要： 以近年来传感器技术的重大突破及成果为基础,总结了传感器技术高精度、微型化、微功耗及无源化、智能化、高可靠性的发展方向。指出了国内传感器技术的主要差距,提出了我国传感器技术发展的对策。

关键词： CpG DNA   Sepsis   Affinity biosensor   Traditional Chinese herbs   Radix et Rhizoma Rhei   Rhein  

摘要： Bacterial DNA/CpG DNA is recognized as a key molecule during the pathogenesis of sepsis. Therefore, preventing CpG DNA from binding to its receptor is considered as the most promising strategy. In the present experiments, Radix et Rhizoma Rhei had the highest CpG DNA-binding ability among the seventy-eight traditional Chinese herbs. After the isolation of silica gel chromatography and high performance liquid chromatography (HPLC) and evaluation with affinity biosensor, the active fraction was confirmed and named Fraction D. It was found that in vitro, Fraction D bound to both CpG DNA and lipid A with high affinity, and strongly inhibited LPS- and CpG DNA-induced TNF-alpha release from RAW264.7 cells in a dose-dependent manner. Furthermore, Fraction D reduced the expression of TLR9 mRNA up-regulated by CpG DNA. In vivo, Fraction D protected mice challenged with lethal heat-killed E coli. Using HPLC method, two monomers with high affinity for CpG DNA were isolated and identified as rhein and emodin. Rhein could significantly reduce CpG DNA- and LPS-induced TNF-alpha release, but emodin only reduced CpG DNA-induced TNF-alpha release. Rhein in combination with emodin could play synergistic inhibitory effect on both CpG DNA and LPS-induced TNF-alpha release, which contributed to the bioactivity of Fraction D. In conclusion, we successfully established the platform to screen anti-CpG DNA components of traditional Chinese herbs using affinity biosensor technology, got active Fraction D from Radix et Rhizoma Rhei and determined rhein and emodin as the main bioactive ingredients in Fraction D. (C) 2009 Elsevier B.V. All rights reserved.