The Research and Design of Low Offset Operational Amplifier

自1930年前后发明了使用真空管的第一个放大器以来，随着固体器件的发展，集成运算放大器发展迅速，同时各项性能也随之大大提高。输入失调电压是运算放大器一个非常重要的性能指标。比如，它限制了一个运算放大器能够正确检测并且放大的最小差分输入信号的大小。在双极工艺上，通过对电阻进行“微调”以及认真的版图设计[1]等措施可以减小失调电压。然而，低频下的1/f噪声对失调有很大的贡献，同时上述技术并不能有效地消除低频噪声。在MOS工艺下，动态的失调消除技术可以很好地解决这些问题。 本论文首先分析了双极和MOS工艺下失调电压的来源以及产生机制，接着提出双极工艺下传统的失调消除方法和MOS工艺下的动态失调消除...The first amplifier using vacuum tube was invented in 1930s. With the development of solid devices, integrated operational amplifiers had been developing rapidly. The performance is also improved greatly. As we know, input offset voltage is a very important performance of operational amplifier (op amp).For example, it limits the least input differential signal which could be detected and amplified...学位：工学硕士院系专业：信息科学与技术学院电子工程系_电路与系统学号：2312007115014

Parametric optimum design of an irreversible photon-enhanced thermionic emission solar cell hybrid system

考虑实际系统中存在的多种传热损失,本文建立一类不可逆光子增强热离子发射太阳能电池与温差热电发电器组合而成的混发电系统模型.基于太阳能电池与温差热电发电器之间的能量平衡方程,导出该混合系统输出功率和效率的表达式.通过数值计算,详细分析了光增热离子太阳能电池的面积、阴极半导体材料的禁带宽度、电子亲和势以及温差热电发电器的无量纲电流对混合系统优化性能的影响,确定混合发电系统运行于最大效率下光子增强热离子太阳能电池阴极材料的禁带宽度,电子亲和势,电池面积和温差热电发电器的无量纲电流的优化值.结果表明,采用混合发电系统,太阳能转换效率与工作于相同条件下的单一光增热离子太阳能电池的效率相比可提高约10%,而光增热离子太阳能电池阴极半导体材料禁带宽度在最大效率下的优化值则比单一光增热离子太阳能电池的小.本文所得结果可为实际光子增强热离子太阳能电池混合发电系统的设计和优化运行提供理论依据.A class of an irreversible thermodynamic model of the hybrid power system consisting of a photon-enhanced thermiomic emission solar cell(PETSC) and a thermoelectric generator(TEG) is established, in which some main irreversible losses existing real hybrid systems are taken into account. Based on equations of the energy balance between the solar cell and thermoelectric generator,expressions for the power output and efficiency of the hybrid system are derived. By using the numerical calculation, influences of the cell area, the energy band gap and electron affinity of the cathode semiconductor materials, and the dimensionless current of the generator on the optimal performance of the hybrid system are analyzed in detail. Under the operating condition of maximum efficiency, the optimal values of some important performance parameters of the hybrid system, such as the energy band gap, electron affinity, area and dimensionless current, are given. The results obtained in this paper show that by using the hybrid system, the solar energy conversion efficiency can be increased by about 10% and the optimal value of the energy band gap for the PESTC of the hybrid system at maximum efficiency is smaller than that of the energy band gap for alone operating PESTC. All the results obtained in this article will provide some theoretical basis for the design and optimal operation of practical PETSC hybrid system.国家自然科学基金(批准号:11175148,11305064);; 福建省自然科学基金(批准号:2011J01012);; 华侨大学引进人才科研启动资金(编号:09BS510)资助项

女大学生创业行为特征及成因初探

以某综合性研究型大学的在校生及毕业五年内创业学生为调查对象,采用问卷调查及数据分析的方法。调查显示：男女大学生在校期接受创业实践教育机会均等,男女参与创业实践项目比例持平,但女大学生实施创业比例小于男生,持续创业比例远低于男生,女大学生在校创业与毕业后创业比例出现断崖式跌幅;男女大学生创业行业分布差异明显,女生主要集中于传统服务业、文化创意类、互联网类、公益创意类、教育培训类等,但相对其他研究行业分布相对全面、均衡

Valence Subband Structure and Optical Gain of InGaAs/InP Quantum Wire

采用有效质量理论 6带模型 ,计算了 In0 .53Ga0 .4 7As/ In P量子线的光学性质 ,具体计算了In0 .53Ga0 .4 7As/ In P量子线的能带结构、态密度、载流子浓度、光学跃迁矩阵元和光学增益谱 ,并把量子线的光学增益谱和量子阱的光学增益谱作了比较。福建省自然科学基金资助课题 (No.E9910 0 0 5

Research of 120 pre-hospital emergency system based on wireless 3G network

目的:针对国内院前急救的发展现状和不足,提出一种基于无线3g网络的120院前急救系统的解决方法。方法:利用无线3g网络通信技术,建立救护车、接诊医院与远端专家之间的信息通路,实现实时音视频和生命体征信息的传输。结果:该系统实现了远程救护指导、抢救方案的提前制订及接诊的准备,从而缩短了患者的救治时延,提高了患者的救治率,减少了医疗纠纷。结论:基于无线3g网络的120院前急救系统是可行的,并将在提高院前急救和转运水平、提高患者的救治率、节约急救资源、减少医疗纠纷等方面发挥更积极的作用。Objective To analyze the current development situation and the deficiency of pre-hospital emergency treatment in China, and to propose a solution for 120 pre-hospital emergency system based on wireless 3G network.Methods Using wireless 3G network communication technology, a remote access of information between ambulance, the admission hospital and remote experts was established, and the real-time transmission of information on audio, video and vital signs was implemented.Results The functions including the guidance of remote ambulance, the early formulation of rescue program and the preparation of clinical reception were implemented by this system, which could reduce the delay time before treatment of patient, improve the patient's treatment rate and reduce medical disputes.Conclusion It is feasible to use a 120 pre-hospital emergency system based on the wireless 3G network.It can greatly shorten the delay before patient treatment, improve the patient treatment rate and reduce medical disputes.南京军区重点项目(11Z023); 漳州市自然科学基金项目(Z2011009

The Diagnosis of the Ancient Trees of Ficus microcarpa

通过对鼓浪屿古榕树的普查,选择其健康诊断的生长指标和生理指标,包括当年生枝叶、果实生长状况、叶绿素荧光等,对不同生长势的古榕树进行分析,旨在探讨基于生长指标与生理指标相结合的古榕树的健康诊断方法,为古榕树的养护与复壮提供依据。结果表明,生长指标与生理指标能较一致地指示古榕树的健康状况。因此,可通过生长指标与生理指标相结合的方法诊断古榕树的健康状况。Based on the general investigation and analysis of the ancient trees of Ficus microcarpa at Gulangyu by use of the growth indices and the physiological indices,such as the growth status of annual branches,leaves and fruits and the chlorophyll fluorescence,the diagnosis of the ancient trees of Ficus microcarpa with different growth vigor was discussed to provide evidence for their maintenance and rejuvenation.The results indicated that the growth indices and the physiological indices could consistently instruct the health status of the ancient trees of Ficus microcarpa.Thus the diagnosis by the combination of the growth indices and the physiological indices could be applied to the ancient trees of Ficus microcarpa.鼓浪屿万石山国家级风景名胜区科技项目资助(GW2008

「継続と変化」を思考概念とした小学校人権学習 －小学校社会科6学年「江戸の社会の変化と人々」を事例として－

departmental bulletin pape

「みなす」差別と向き合い看破する児童・生徒の育成をめざす授業開発－小学校社会科「不安やおそれから逃れることの何が問題か：平安から室町時代の社会と人々」（ 6 学年）の検討を通して－

departmental bulletin pape