安培检测芯片毛细管电泳及其初步应用

An end-channel amperometric detector with a guide tube for working electrode was designed and integrated on a home-made glass microchip. The guide tube was directly patterned and fabricated at the end of the detection reservoir, which made the fixation and alignment of working electrode relatively easy. The fabrication was carried out in a two-step etching process. A 30 μm carbon fiber microdisk electrode and Pt cathode were also integrated onto the amperometric detector. The baseline separation of dopamine (DA), catechol (CA) and epinephrine (EP) was achieved within 80 s. Relative standard deviations of not more than 5.2% were obtained for both peak currents and migration times of DA and CA (n=5). Using standard adding method, DA in tLrine and plasma samples was detected. The recoveries were in the range of 83%—103%.     

脉冲极谱法研究 II. 吸附可逆波的理论和验证

本文推导了同时受反应物和产物影响的脉冲极谱电流方程式, 并对电流-电位曲线的性质进行了讨论, 用三种体系进行验证, 实验结果与理论相符合。     

BAYER COUNTER CURRENT SYSTEMS IN COMPARISON WITH CONVENTIONAL CO—CURRENT SYSTEM IN THE FIELD OF WATER TREATMENT

From an economical point of view both the quality of the ion exchange resins and the technology used in the field of industrial water treatment are important for a successful performance.In general,two different technologies have been established on the market:The main differneces between the CO-and counter current technologes will be discussed and data concerning the requirement of chemicals for regeneration and the quality of the deionized water will be opposed.In addition several different varieties of the modern counter current technologies,developed and patented by Bayer AG,will be described and the advantages,depending on the application and the demand on the quality of the deionized water,pointed out .In view of stronger regulations concerning the consumption of regeneration chemicals,and waste water,and also because of the superior quality of the produced water,the market share of counter current technologies will continue to increase world-wide.     

恒电流库仑法测定基准试剂三氧化二砷的含量

用恒电流库仑法测定基准试剂三氧化二砷的含量，以恒电流通过含有碘化钾，基准试剂三氧化二砷试样的弱碱性水溶液，利用工作电极铂阳极上电生滴定剂I2与亚砷酸盐定量反应，以死停终点法确定滴定终点，测量出电解电流和电解时间，根据法拉第电解定律并利用EXCEL计算出基准试剂三氧化二砷的含量。方法的回收率为100％。     

有机硅侧链液晶研究进展

综述了国内外有机硅侧链液晶近年来的研究进展，对近晶型、席夫碱型、向列型、胆甾型、偶氮苯型、鱼骨型以及光学非线性型几种主要类型的有机硅侧链液晶进行了详细介绍，并对近年来受到重视的有机硅侧链液晶电流性和离聚物研究进展作了较全面的总结，最后对其应用前景进行了展望。     

测量散射参数的交互换位双信号方法及其应用

叙述了外内向功率波复数比的测量方法,给出了散射参数测量的交互换位双信号测量线方法。用此方法测量了双栅ＧａＡｓＭＥＳＦＥＴ适用散射参数,并用它设计Ｓ波段混合集成双栅ＧａＡｓＭＥＳＦＥＴ可控增益放大器。测试结果与设计吻合。     

一种高共模抑制比轨到轨全差分运算放大器

针对传统全差分运算放大器电路存在输入输出摆幅小和共模抑制比低的问题,提出了一种高共模抑制比轨到轨全差分运算放大器电路。电路的输入级采用基于电流补偿技术的互补差分输入对,实现较大的输入信号摆幅;中间级采用折叠式共源共栅结构,获得较大的增益和输出摆幅;输出级采用共模反馈环路控制的A类输出结构,同时对共模反馈环路进行密勒补偿,提高电路的共模抑制比和环路稳定性。提出的全差分运算放大器电路基于中芯国际(SMIC) 0.13μm CMOS工艺设计,结果表明,该电路在3.3 V供电电压下,负载电容为5 pF时,可实现轨到轨的输入输出信号摆幅;当输入共模电平为1.65 V时,直流增益为108.9 dB,相位裕度为77.5°,单位增益带宽为12.71 MHz;共模反馈环路增益为97.7 dB,相位裕度为71.3°;共模抑制比为237.7 dB,电源抑制比为209.6 dB,等效输入参考噪声为37.9 nV/Hz^1/2@100 kHz。     

栅控二极管ESD工艺优化方法研究

为解决通过更改器件设计来提升电路抗静电放电（ESD）能力时成本高的问题,从栅控二极管的工艺出发,研究CAN总线电路抗ESD能力提升方法。通过TCAD仿真,评估了沟道掺杂对于栅控二极管抗ESD能力的影响,发现调整ESD离子注入工艺可以优化栅控二极管导通电阻,提高ESD保护窗口内的泄流能力,将电路抗ESD能力从2 000 V提高到3 000 V,为电路级芯片的失效问题提供了一种解决方案。     

自加热非晶锗热电阻MEMS流速传感器的制造与测试

为扩大流速传感器的测量范围并降低功耗,制造并测试了一种基于自加热非晶锗薄膜热电阻的MEMS流速传感器,它是由嵌入氮化硅薄膜的四个非晶锗热敏电阻和一对环境测温补偿电阻组成。四个非晶锗热电阻同时作为自加热热源和测温元件,相互连接以形成惠斯通电桥。给出了MEMS工艺流程,微加工制造了尺寸为8.9 mm×5.6 mm×0.4 mm的流速传感器芯片。搭建了低流速和高流速气流通道实验装置,对传感器的惠斯通电桥施加50μA的恒定电流(CCA),实现了0～50 m/s范围内的流速测量。结果表明,传感器在低流速(0～2 m/s)时的灵敏度约为81.6 mV/(m/s),在高流速(2～50 m/s)时的灵敏度约为51.9 mV/(m/s),最大功耗仅约为1.03 mW。