Φ1.8mm棒状压电陶瓷微马达的研究

提出一种低成本、结构简单 ,直径为 1.8mm的摆头式棒状压电微马达。阐述了压电微马达的驱动机理、部分制作工艺及工作特性。该压电微马达的换能激振部分采用外形尺寸 1.8mm× 8mm的压电陶瓷圆棒 ,马达整体装配外形尺寸 1.8mm× 12 mm ,质量不足 0 .2 5 g,稳定工作频带宽 ,约为 3k Hz,最高空载转速不低于5 0 0 r/ min。     

PAN分光光度法测定全珍珠水解液中微量铜

探讨了用Cu-1-(2-吡啶偶氮)-2-萘酚分光光度法测定珍珠水解液中微量铜的最佳条件.在HCl-KCl溶液介质中,十二烷基苯磺酸钠存在下,其表观摩尔吸光系数为1.42×104L·mol-1·cm-1,Gu2+含量在0-100μg/50m1范围服从比尔定律,检测限为0.5μg/dms.应用于珍珠水解液制备的工艺优化中指标控制,效果良好.     

A Generic Design of a Flow-Through Potentiometric Sensor Array

 In this paper, a flow-through potentiometric microsensor is described which is based on semi-permeable tubing. The ion selective electrodes proposed are of the liquid membrane type in which a dialysis tube captures the ion selective cocktail. Ion selective sensors and a reference electrode based on the same design were constructed by guiding a 0.3 mm diameter dialysis tube through a cavity precision machined in Perspex?. Commercia lly available ionophore or ion-exchanger cocktails were applied to provide ion selectivity whilst a saturated KCl solution was used in the reference electrode. A number of flow-through microsensors selective to different ions (Na, K, Li, pH) were constructed and tested. Each showed good performance in a broad range of concentrations. Advantages of the proposed approach are the generic technology to make sensors with incorporate d reference electrodes, capable of measuring a wide variety of analytes for which cocktails are readily available and the fact that sub-microliter amounts of sample can be measured. Secondly, in comparison to other sensors applied in microchannels, the impedance of the flow-through sensor is much smaller because of the relatively large sensing surface formed by the tube wall. Moreover, the use of dialysis tubing enables easy integration with a so-called microdialysis probe for in-vivo sampling of the blood stream or subcutaneous tissue. Received December 6, 1999. Revision March 24, 2000.     

一种大角度高频率的激光偏转扫描微反射镜设计方案

本文设计了一种用于激光偏转扫描的微反射镜 ,使用微结构对激光光束实现高频率、高效率、大角度偏转。通过理论计算 ,该微反射镜可以 80 0Hz频率、40°偏转角进行激光扫描。     

快速识别金属材料缺陷的一种新方法

本文提出一种快速识别金属材料中缺陷的位置、形状和大小的新方法.该方法用位于分界面上的多个等效线圈产生的场等效逼近因缺陷存在引起的扰动场,使逆问题的求解中每次需用数值方法求解正问题的过程转变为每次用解析法求解正问题.缺陷的重构速度比用体积分方程法提高十倍以上.直线裂缝和十字型裂缝的重构计算证明本文方法是正确的和快速有效的.     

Using Analog Predistortion for Linearizing Class A–C Power Amplifiers

An analog 5th order, complex-valued polynomial predistortion IC has been built to linearize the behavior of RF power amplifiers. The predistorter can be used either at baseband or low IF frequencies and it was tested using a simple IF amplifier that could be biased to operate in classes A, AB, B and C. Intermodulation products can be reduced by 20 to 30 dB in classes A and AB over a bandwidth of several MHz. In classes B and C the shape of nonlinearity is such that a low-order polynomial predistortion function is not sufficient for linearizing them.     

射频能量捕获传感网移动能量源的布置策略研究

射频能量捕获传感网（RF Energy Harvesting Wireless Sensor Network,RFEH-WSN）由专用射频能量源设备（Energy Transmitter,ET）和具有射频能量捕获功能的传感器节点（Energy Harvesting Recevier,简称EHR）组成.该网络解决了传感器网络中电池不易更换与节点能量容易耗尽的问题,使得RFEH-WSN应用前景更加广阔.RFEH-WSN应用中一个值得研究的问题是如何布置ET的充电位置,降低ET能耗且提高覆盖率.已有的工作主要考虑ET布置中单目标优化问题,如最小充电时间、最小功耗、最大覆盖率等.本文以时间最小和覆盖率最大为目标建立多目标优化模型,并提出利用粒子群算法（Particle Swarm Optimization,PSO）求解多目标函数（Multiple Object Program,MOP）的低复杂度近似算法,获得了最优Pareto解集.仿真结果表明,多目标优化可以满足不同情况的需求,提高充电效用.     

用SEM研究高聚物的微观形态结构

用扫描电子显微镜（ＳＥＭ）,对ＨＤＰＥ／ＣａＣＯ３填充高聚物、ＰＰ／ＥＰＤＭ高聚物共混物和ＰＡ／ＣＦ增强复合材料的微观结构形态进行了研究,并分析了各材料的改性机理,证明了ＳＥＭ技术在高分子多相体系的形态结构、界面状况、损伤机制及材料性能预测等研究中发挥着重要作用。     

双极模拟集成电路版图识别的模式识别算法

双极模拟ＩＣ在广泛应用于个人移动通信ＲＦＩＣ中占有重要地位。双极模拟ＩＣ版图识别与验证是其ＣＡＤ研究的重要内容之一。基于模式识别和专家系统的思想,提出了一种双极模拟ＩＣ版图识别的模式识别算法。该方法定义了五种基本版图图形关系,在此基础上构造了版画图技术向量,建立了算法系统及识别系统。该识别算法的优点在于与具体工艺过程无关,从而使识别过程完全系统化。实验表明,该识别系统有效、准确、可靠。     

射频磁控溅射法制备Cu3N薄膜及其性能研究

采用反应射频磁控溅射法,在氮气和氩气的混合气体氛围中,玻璃基底上制备出了具有半导体特性的氮化铜(Cu3N)薄膜,并研究了混合气体中氮气分量对Cu3N薄膜的择优生长取向、平均晶粒尺寸、电阻率和光学带隙的影响.原子力显微镜,X射线衍射仪,四探针电阻仪,紫外可见光谱分析及纳米压痕仪等测试结果表明:薄膜由紧密排列的柱状晶粒构成,表面光滑致密;随着氮气分量的增加,Cu3N薄膜由沿(111)晶面择优生长转变为沿(100)晶面择优生长,晶粒尺寸变小,电阻率ρ从1.51×102Ω·cm逐渐增加到1.129×103Ω·cm;薄膜的光学带隙在1.34～1.75eV间变化;薄膜的硬度约为6.0GPa,残余模量约为108.3GPa.