一种高精度大位移电容式位移测量系统

介绍一种新型的电容式位移测量系统，其测量范围为０～２５ｍｍ，线性度优于１／１０００，分辨率为０．１μｍ。文中详细分析了该系统的工作原理，特点及主要误差因素，给出了部分实验数据。     

Nanoporous activated carbon cloth for capacitive deionization of aqueous solution

Activated nanostructured-carbon cloths with a high ratio of surface area to volume are used as electrode for capacitive deionization. The electrochemical properties on capacitive deionization for NaCl solution have been investigated to improve efficiency of capacitive deionization properties from aqueous solution, employing chemical surface-modification by etching in alkaline and acidic solution. The removal efficiency of inorganic salts of activated carbon cloths by chemical modification significantly increased. Specially the carbon cloth surface modified in HNO₃ showed an effect of improvement in the CDI efficiency due to not only ion adsorption by an electric double layer, but also electron transfer by Faradaic reaction.     

Development and characterization of silicone/phosphorus modified epoxy materials and their application as anticorrosion and antifouling coatings

Epoxy resin is chosen for our present study owing to its exceptional combination of properties such as easy processing, high safety, excellent solvent and chemical resistance, toughness, low shrinkage on cure, good electrical, mechanical and corrosion resistance with excellent adhesion to many substrates. This versatility in formulation made epoxy resins widely applied for surface coatings, adhesives, laminates, composites, potting, painting materials, encapsulant for semiconductor and insulating material for electric devices. There are numerous paint/coating systems based on epoxy resin available for corrosion and fouling prevention. They however are not completely satisfactory in field applications, where high corrosion, fouling and flame resistance are required. The demand for epoxy resin as corrosion/fouling resistant coatings is restricted mainly due to its inferior characteristics like poor impact strength, high rigidity, and moisture absorbing nature besides inadequate flame retardant properties. It is for this reason that silicones and phosphorus-based compounds are used as modifier in this work by intercrosslinking network mechanism (ICN) to obtain epoxy resin with desired properties ideally suitable for field applications for preventing corrosion and fouling with flame retardantancy. The present work involves the development of solvent free silicone/phosphorus modified epoxy coating systems, since solvent free coating systems are widely used for numerous applications due to their lower cost per unit film thickness, freedom from fire and pollution hazard and ability to provide better performance. For the development of coating systems, epoxy resin (X) serves as base material, hydroxyl terminated polydimethylsiloxane (HTPDMS) as modifier, γ-aminopropyltriethoxysilane (γ-APS) as crosslinking agent and dibutyltindilaurate (DBTDL) as catalyst. Polyamidoamine (A), aromatic amine adducts (B) and phosphorus-containing diamine (C) were used as curing agents. The study also describes the evaluation of corrosion resistant behaviour of unmodified epoxy and siliconized epoxy coatings by potentiodynamic polarization method, electrochemical impedance spectroscopy (EIS), salt-spray and antifouling tests. The results are discussed.     

电子设备电源系统的谐波特性研究

电子设备的电源系统或电力系统中,存在多种类型的谐波源,分为谐波电流源和谐波电压源,本文针对典型电源系统开关电源系统进行分类和建模,给出各类谐波源的特征,并对容性滤波整流电路的谐波特性进行了分析.     

Capacitive micromachined ultrasonic transducer (CMUT) arrays for medical imaging

Capacitive micromachined ultrasonic transducers (CMUTs) bring the fabrication technology of standard integrated circuits into the field of ultrasound medical imaging. This unique property, combined with the inherent advantages of CMUTs in terms of increased bandwidth and suitability for new imaging modalities and high frequency applications, have indicated these devices as new generation arrays for acoustic imaging. The advances in microfabrication have made possible to fabricate, in few years, silicon-based electrostatic transducers competing in performance with the piezoelectric transducers. This paper summarizes the fabrication, design, modeling, and characterization of 1D CMUT linear arrays for medical imaging, established in our laboratories during the past 3 years. Although the viability of our CMUT technology for applications in diagnostic echographic imaging is demonstrated, the whole process from silicon die to final probe is not fully mature yet for successful practical applications.     

交流LED驱动电路之研究

目前不管国内还是国外LED的驱动电路一般都采用直流电源来供电，本文将介绍用交流电直接驱动LED的技术，因LED具有响应时间短，高频性即理论上可闪烁无数次等特点。故此我们可直接用交流电来点亮LED，并且经过分析交流电直接驱动LED有诸多的优点。     

配电网对地电容电流的注入信号测量法

分析了从电网二次侧测量配电网电容电流的方法,根据情况可分别从电网的PT开口三角端或消弧线圈的二次绕组注入变频恒流信号,从而计算出配电网对地电容电流。     

电容式微加速度传感器控制电路研究

本文首先阐述了电容式微加速度传感器的一般结构及系统建模方法，然后提出一种静电力反馈平衡控制电路，先通过高频调制信号产生检测电压，再经过ＰＩ反馈控制器产生静电反馈力，以提高传感器的噪声抑制能力、输出线性度和动态响应范围。     

高分子功能材料及在传感器中的应用──湿度传感器(连载六)

简要介绍了高分子湿度传感器的种类、原理及其特点、应用。     

配电网对地电容电流的注入信号测量法

分析了从电网二次侧测量配电网电容电流的方法，根据情况可分别从电网的PT开口三角端或消弧线圈的二次绕组注入变频恒流信号，从而计算出配电网对地电容电流。