基于半导体陶瓷技术的二氧化碳传感器研究

采用硬质酸盐方法制备出纳米BaTiO3粉末,利用半导体陶瓷技术掺杂CeO-AgNO3制造出对CO2气体敏感的功能材料.基于CaCO3和RuO2制作电极,NiCr丝加热.CO2气体传感器当加热到400~450℃时,CO2体积分数为100×10-6~2 000×10-6,传感器的特征阻值由600 kΩ变化到150 kΩ,函数关系呈良好的全对数线性,同时测定了元件的温度特性和湿度特性,提出了此种传感器工作时,为提高传感器测试准确性,应考虑环境温湿度补偿技术.     

绝缘体上硅高温压力传感器研究

采用有限元分析工具ANSYS完成了一种矩形弹性膜绝缘体上硅(SOI)高温压力传感器的优化设计，制作出样品，并与相同结构、工艺的多晶硅压力传感器进行了对比测试。结果表明：1：2的膜片宽长比可以使SOI压力传感器的灵敏度达到220mV／MPa，远大于多晶硅压力传感器的灵敏度(约50mV／MPa)。此外，该传感器能够工作在200℃的高温环境中，有良好的长期稳定性，30d内的零点时间漂移为0．12％。     

全对称谐振式压力传感器结构设计与仿真分析

提出了一种基于侧向驱动的全对称谐振式压力传感器结构.谐振结构采用侧向梳齿电容驱动,既保证了驱动力的线性特性,又由于本身的空气阻尼为滑膜阻尼,可以取得较高的品质因子.另外,设计的差分电容结构能进一步提高器件的检测灵敏度.经过ANSYS 10.0的仿真分析总结出谐振结构固有频率受结构参数影响的规律,确定了量程为0～550 kPa的谐振式压力传感器具体尺寸,其灵敏度达到了22.602 Hz/kPa;分析了温度对谐振结构固有频率的影响,得到-20～60℃下的热灵敏度温度系数为-1.8233 Hz/℃,为后续的温度补偿提供依据;最后通过分析谐振结构的频域响应特性,最终确定了传感器的频域特性曲线以及不同阻尼比下传感器的品质因子.为谐振式压力传感器真空封装的真空度选择提供参考.     

光纤光栅压力计及其传感特性的研究

设计了一种基于悬臂梁结构的光纤布拉格光栅（FBG）压力传感器,采用应变片作为悬臂梁,将垂直压力转换成轴向应力. FBG固定在悬臂梁上,将应力转换成中心波长的漂移. 通过半导体激光器斜边检测法检测FBG波长的移动. 研究了FBG栅区长度和特征反射光谱宽度的关系,选择并制作了栅区长度为1 mm的FBGs作为传感器,确保FBG中心波长漂移时,半导体激光的波长仍在FBG的反射光谱区域内,扩大了传感器的动态范围. 在悬臂梁双侧设计了FBGs对结构,利用这对FBGs对环境温度相应系数相同的特性,消除环境温度波动对压力测量的影响. 在实验中改变FBGs对的温度,测量了它们对温度的响应并利用温度消敏算法获得传感器的温度不敏感性能. 提出了FBG压力传感器的空分复用技术,利用多个光纤耦合器和光电探头（PD）阵列组成传感网络. 上述的压力传感网络技术在边坡、基坑等土木工程结构安全监控领域具有实用价值.     

耐高温压阻力敏硅芯片及静电键合工艺

采用微型机械电子系统(MEMS)技术制作出了平膜型硅隔离(SOI)耐高温压阻力敏硅芯片,采用静电键合工艺将该力敏硅芯片封装在硼硅玻璃环上,制作出倒杯式弹性敏感单元.分析了静电键合时力敏硅芯片与玻璃环的对准偏差对力敏硅芯片非线性的影响;实验验证了静电键合工艺对硅芯片温度性能的影响以及制作的耐高温压力传感器的性能.结果表明,对准偏差对硅芯片的非线性有较大影响;静电键合工艺对硅芯片的零位时漂和热零点漂移影响较小;制作的耐高温压力传感器具有优良的性能指标,能满足实际的工程应用需求.     

半导体吸收式光纤温度传感器

利用半导体光吸收原理 ,提出了一种新颖的半导体吸收式光纤温度传感器 ,它可实现在高压、强电磁环境下对电力系统线路及设备的温度测量。该传感器使用砷化镓半导体材料作为温度敏感元件 ,并用反射式传感结构 ,使其具有结构简单、容易使用、响应速度快的特点 ;同时利用除法器减少了光强的变化及光纤连接损耗对传感器信号的影响。实验测定 ,该传感器在 - 2 0℃～ 110℃的温度范围内有1℃的精度 ,温度在 15℃～ 110℃范围变化时有 2 5 s的响应时间。     

中子辐照半绝缘硅衬底上的SOI技术

本文描述了一种新奇的SOI技术:中子辐照单晶硅形成半绝缘材料,经激光扫描退火恢复表面层的半导体特性并由此组成了SOI结构.在这个结构上我们制作了n沟MOSFET.本文研究了这种半绝缘层的性质,这种技术的工艺流程和条件以及用这种方法制得的MOS器件的性能.     

中子辐照半绝缘硅衬底上的SOI技术

本文描述了一种新奇的 SOI 技术:中子辐照单晶硅形成半绝缘材料,经激光扫描退火恢复表面层的半导体特性并由此组成了 SOI 结构。在这个结构上我们制作了 n 沟 MOSFET。本文研究了这种半绝缘层的性质,这种技术的工艺流程和条件以及用这种方法制得的 MOS 器件的性能.     

一种温度自补偿光电转换电路

半导体发光、光敏器件的特性受温度影响较大，常成为光学式传感器的一大误差来源。本文介绍的光电转换电路，适于模拟式光学传感器。在－２０℃至１００℃之间，可使传感器的光电转换输出随温度变化小于±０．１％。     

利用硅横向压阻效应的压力敏感器件

随着半导体微电子学的发展和计算机的广泛应用,传感器也向着半导体化的方向发展.硅压阻式压力传感器是半导体传感器中历史较久的一种,近年来更向着小型化和集成化的方向发展.但目前的硅压力传感器的核心部分都是由制作在硅薄膜上的四个力敏电阻组成的力敏全桥构成的.图1是它的电路和结构示意图.在无应力时,四个电阻     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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