The Current-Mode Technology Have Application in PVDF Piezoelectric Sensor

In this paper apply the Current Mode Technology,adopt single chip integration data amplifier AMP 01 which have the specificity of electric current feedback,high-speed,wide band frequency,lower noise and higher precision,to Study Piezoelectric effect and arbitrary dispersed specificity about PVDF film.The equation of Piezoelectric specificity is built.Talk over the integration intelligence structure sensor model of tactility which have the specificity of arbitrary dispersed.Discuss application in bionics skin. [WT5HZ]     

压电振动发电机理论建模与发电性能研究

为了促进农业生产的现代化和智能化,研究环境信息采集设备—无线传感器网络新的供能方式。以压电方程为基础,结合比能特性,建立了悬臂压电梁发电能力数学模型,分析对比了单晶、双晶串联和双晶并联压电梁输出电压、电荷与电能,最后通过有限元仿真验证,分析结果表明:外力激励环境中,应尽量增加悬臂压电梁长度,减少宽度,同时为了获得较大的输出电压及电能,应优先选用双晶串联压电梁。     

Point Force Model of Smart Structure Piezoelectric Actuator With Paste Layer

In the smart bar-beam structure with piezoelectric strain actuator active control function to vibration, the thickness effect of paste layer is considered and strain is assumed linear distribution along the thickness direction of each layer. The piezoelectric actuator point force model of Crawley and Luis is refined, a more general point force model is established to the smart beam with strain actuator. Point force model calculation formula is educed to smart beam with two-side symmetry paste actuator or one-side paste actuator. The computer simulation is done and the result reveals modified point model is right. The modified model is more common, as is important to design piezoelectric smart structure.     

Gold Nanoparticles Preparation and Application in DNA Detection

Several conventional methods for preparing gold nanoparticles and their features are reviewed,Which are separated into physical metnods. The physical methods include vacuum evaporation,soft landing and laser ablation, and chemical methods the chemical ones have colloidal metheds,crystal species generating metheds,reverse micellar methods,phase transmission and model methods,etc..Gold nanoparticles with different size and shape can be produced by different methods. Peculiar physical and chemical properties of gold nanoparticles make them have wide applications in fields of chemistry, biology and medicine, especially in DNA detection. There are optical, electrochemical and piezoelectric methods for detection of DNA. The sensitivity and detection range of these methods can be significantly improved with the using of gold nanoparticles.     

Green's Function s of a Piezoelectric Half-space for Axisymmetric Problems

Green's functions for axisymmetric problems of a piezoelectric half space have been included in a recent paper of Ding et al. (1999). It is found, however, some terms in the solution have been missed there. In this paper, a complete and exact solution is presented.     

压电智能传感器力学模型的建立及数值模拟

以单片压电陶瓷（如锆钛酸铅,简称PZT）晶体、粘贴式和埋入式压电传感器为研究对象,从压电本构方程和结构动力学的振动原理出发,采用集总质量法推导出PZT传感器正压电效应的电荷表达式及等效刚度表达式,建立粘贴式和埋入式PZT传感器的简化力学模型,得到考虑多参数影响的电荷表达式。考虑黏结胶层阻尼吸收能量的作用,建立了胶层阻尼效应影响的传感模型,并求得压电传感器的电压表达式。数值模拟结果表明：在PZT传感模型中,利用压电方程和振动方程联合求解可以快速得到PZT的传感信号,而且PZT片的电压输出特性与作用力的大小及黏结胶层有关。通过测量和分析PZT传感器输出电信号峰值与频率的变化,并与数值分析结果进行对比,证明了运用所建立的传感模型能够有效地模拟检测PZT的正压电规律。     

考虑横向剪切和转动惯量效应的多层压电层合壳中波的传播

研究了考虑横向剪切及转动惯量效应影响的正交各向异性压电层合壳中的波传播规律。利用Cooper-Naghdi壳体理论建立了波在压电层合壳中传播方程，通过求解特征值得到并讨论了波在压电层合壳中传播特征曲线，分析丁不同的压电层数和厚度比对特征曲线的影响。该方法可用于不同层数、不同厚度、不同母体材料层的壳体中波传播的研究。     

压电材料圆形夹杂内位错和界面刚性线的电弹干涉

首次研究了压电复合材料中圆形夹杂内压电螺型位错和界面导电刚性线的电弹耦合干涉效应，运用复变函数解析延拓技术与奇性主部分析方法，获得了基体和夹杂区域复势函数的封闭形式解，该解答可作为格林函数求解裂纹和界面刚性线的干涉作用．应用扰动技术，导出了位错力的解析表达式．计算结果表明，界面刚性线对压电螺型位错与圆形夹杂的干涉具有强烈扰动效应．当界面刚性线达到临界值时，可以改变夹杂和压电位错的干涉机理。     

压电晶体化学传感器研究进展

本文综述了压电晶体化学传感器在气相、液相物质和生物学上的应用，介绍了压电晶体化学传感器的新型装置（如传感器阵列）、新型敏感材料.