具有PDEB LB膜的声表面波湿度传感器

介绍一种新型聚炔离子导体湿敏材料－聚对二炔苯的Ｌａｎｇｍｕｉｒ－Ｂｏｌｄｇｅｔｔ成膜原理与制备，淀积有１０层ＰＤＥＢ ＬＢ膜层的声表面波延迟线型湿度传感器的特性。由于ＬＢ成膜技术拉制的膜可以在分子水平上进行定量控制，保证了膜的均匀性和一致性。     

热敏电缆在拉拔减径工艺过程中的性能变化

在拉拔减径工艺的初始阶段，装填于热敏电缆中的氧化物陶瓷热敏材料粉的体积将发生收缩，随后体积不再发生变化。对于不经过热处理的样品，理论分析和实验结果表明，体积收缩停止后，其每米电阻值不随尺寸变化而改变。由于安装等因素引起的芯线电极的位置偏差不公带来样品电阻较大的变化。对于经过热处理的样品，其电阻值在热处理前后及拉拔减径过程中都有较大的变化（可达几个数量级），变化规律较为紊乱。实验分析发现，热处理后的     

智能压力传感器

讨论了压阻式智能传感器的设计,并以80C31单片机为核心构成了一个能检测压力、温度的智能传感器,它能实现量程的自动变换、故障的自诊断及数据的处理,通过软件实现了对半导体传感器的零点修正、非线性修正及温度补偿。实验表明,传感器的智能化改善了传感器的性能。     

无线传感器网络MAC层协议的对比研究

无线传感器网络是二十一世纪新兴的网络技术，它的出现使网络的发展进入一个新的阶段。针对无线传感器网络MAC层协议的研究一直是人们普遍关注的问题。总结了近年来的研究成果并针对TDMA，IEEE802．15．4，S—MAC，T—MAC几种典型的MAC层协议进行了对比分析，根据其各自的优点提出将来工作的方向和建议。     

硅尖阵列-敏感薄膜复合型阴极真空微电子压力传感器特性的测试

封装、测试了硅尖阵列-敏感薄膜复合型阴极的真空微电子压力传感器，在计算机模拟计算的基础上，对封装好的真空微电子压力传感器进行了实物测试，得出实物测试场发射电流曲线（开启电压低，发射电流曲线与计算机模拟曲线一样，电压45V时发射电流可达到86mA，平均每个硅尖为21μA）、压力特性曲线（呈线性变化，与计算机模拟计算的曲线相近）及灵敏度数据。电压1.5V即可测试并且其压力特性成线性变化，灵敏度为0.3μA/kPa。     

利用单片机实现的空气干燥器控制仪

为了满足不同生产实际的需要 ,介绍了利用单片机实现的空气干燥器控制仪的基本组成和工作原理 ,重点介绍了温度测量和A/D转换方法 ,进一步指出了提高测量准确度的途径。经实际应用表明 ,各项指标满足控制要求。     

溶胶—凝胶法制备基于荧光猝灭原理的光纤氧传感器在线监测水中溶解氧

利用氧分子对金属钌化合物的荧光具有猝灭作用的特性,构造出基于荧光猝灭原理的光纤氧传感器。就用于水中溶解氧在线监测的光纤光谱仪的搭建、传感器探头的设制及传感膜的制作过程进行探索,并对传感器的响应性能进行考察。结果表明以联吡啶钌等作为荧光指示剂以溶胶-凝胶法制备的传感膜对溶解氧的响应具有良好的可逆性,稳定性,较快的响应时间和较长的使用寿命。与标准法相对照,用本仪器系统测定了不同盐度的人工海水中的溶解氧浓度,两种方法在不同浓度水平下的溶解氧测定值均无显著性差异。本法的日内和日间RSD在1.7％～5.0％之间。     

基于人工神经网络的混合气体定量检测方法

将气体传感器阵列与人工神经网络相结合，设计了用于混合气体定量检测的人工嗅觉系统；构造了局部连接的前馈神经网络的结构和基于递推预报误差的网络训练算法；通过实验对CO，H2，CH4三种气体的混合物进行了分析，实验结果证明气体传感器阵列和人工神经网络用于混合气体定量检测是可行的。     

Accumulation of amplified target DNAs using thiol/biotin labeling, S1 nuclease, and ferrocene-streptavidin-magnetic system and a direct detection of specific DNA signals with screen printed gold electrode

Combinations of PCR-based amplification platform using 5′ thiolated and biotinylated specific primers, S1 nuclease-PCR products treatment, ferrocene-streptavidin (Fc-Stv)-magnetic binding for DNA accumulation, and screen printed gold electrode for the DNA allocation, were applied to Hoechst 33258-induced DNA aggregation and signals induction system for direct signals detection and DNA quantification in food samples. Thiolated and biotinylated at each 5′ terminus enabled DNA purification through S1 nuclease treatment for primers and non-specific DNA elimination and enabled DNA trapping with a ferrocene-streptavidin-magnetic system. This facilitated the accumulation of target DNAs at higher concentration, resulting in enhanced signals. After allocation of DNA on the surface of gold electrode via thiol binding, intensity of DNA signals through these treatments could be measured directly after being induced by Hoechst 33258. Wider amplitude changes in anodic current peaks between negative and positive samples (increasing from 3.70 to 10.10 μA) compared with those applied with no treatment combinations (decreasing from 3.92 to 1.23 μA) were observed. This enhancement of the signals allowed a greater efficiency of DNA quantification. When this combination was used for GMOs content estimation in reference samples, results revealed an improved accuracy from 66% to 96%. The combined biosensor system, although more costly than the standard Hoechst 33258/carbon electrode system, provided an alternative choice for DNA quantification, offering labor-free immobilization of probe onto electrode surface, easy test administration, and efficient semi-quantitative test without expensive instruments.     

Diffusion-controlled size-selective chloride ion sensing in the presence of bromide ion using a thin, nanoporous, plasma-polymerized coating on an Ag/AgCl electrode

We have developed a diffusion-controlled size-selective method for sensing chloride ion in the presence of bromide ion, based on a thin, nanoporous, plasma-polymerized coating of hexamethyldisiloxane on an Ag/AgCl electrode. Sub-nanometer-sized pores responsible for a highly cross-linked polymer network in the plasma-polymerized coating allowed diffusion-controlled permeation of chloride ion while blocking the larger bromide ion. An electrode coating of thickness greater than 70 nm enabled chloride detection in the concentration range 1-10 mM in the presence of 0.63 mM bromide ion. Advantages of this approach are: (1) simple design compared with ionophore-based strategies and (2) compatibility with microfabrication and mass production processes.