Research on laser lift-off of GaN LED thin films

GaN及其化合物是直接带隙半导体材料，它的禁带宽度从1.9eV～6.2eV连续可调，发光范围覆盖了从红色到紫外的光谱，GaN材料是一种理想的短波长发光材料。它主要用于制作蓝、紫、紫外发光二极管（LED），激光器（LD）、紫外（UV）光电探测器等光电子器件。GaN和Si之间的晶片键合和激光剥离工艺可以很方便的实现不同材料的集成，为GaN基材料的外延生长、器件的工艺制作提供一个新的研究方向。 本文利用键合和激光剥离技术，实现了Φ2英寸GaNLED器件外延薄膜的激光剥离，并且实现蓝宝石衬底的重新利用。通过理论计算优化激光剥离的参数，利用衬底加热的方式实现降低阈值密度快速的激光剥离。目前国内外还没有...GaN is a very favorable materials system for short-wavelength optical device. The band gap of GaN-based material can be tuned between 1.9 eV and 6.2 eV, ranging from red to ultraviolet (UV). The GaN-based systems have promising applications in the optoelectronic industry , in particular blue/UV light LEDs、laser diodes(LD)、UV detectors. A combination of wafer bonding and thin-film lift-off offers t...学位：理学硕士院系专业：物理与机电工程学院机电工程系_凝聚态物理学号：1982006115178

The Study on Brand Position Strategy of “SEPTWOLVES”（Tong Xian）Cigarette

2009年，国家烟草专卖局提出“卷烟上水平”的基本方针和策略任务，并以“532”、“461”作为品牌发展目标，全面推进行业发展方式的转变。面对新的形势，“七匹狼”既面临重大的策略机遇，也面临空前的竞争压力，必须再定位、再提升、再发展。 当前对“七匹狼”发展而言，十分重要的任务就是要在较短的时期内扭转被市场消费者定位为中低档卷烟的现状，培育出能够给零售客户较好盈利，给消费者物超所值的新品，实现脱胎换骨。为此我们提出要打造有冲击力、溢价力、带动力的高端新品。 本文首先从理论基础的角度对“七匹狼”卷烟进行品牌定位分析，通过对实施品牌定位的必要前提，品牌定位原则和切入点，不同竞争地位的企业品牌定位...In 2009, State Tobacco Monopoly Administration lodged the basic guideline and strategic mission of “upper level of cigarette” and, taking “532” and “461” as industry brand development target, comprehensively promoted the change of the industry development mode. Facing new circumstance, there are not only strategic opportunities, but also unprecedented competition pressure faced by “SEPTWOLVES” cig...学位：工商管理硕士院系专业：管理学院工商管理教育中心（MBA中心）_工商管理硕士(MBA)学号：X20041546

Research of the Relationship between Achievement Motivation and Creativity of Female Students in Vocational College

成就动机是近代心理学研究的重要课题，是非智力因素的核心内容，对人的行为活动和成果有着重要的作用和影响。近年来，随着女性地位的提高，成功女性的比重在逐渐增加，这直接引起了心理学、教育学、社会学等学者的关注，对女性成就动机与创造力关系的研究也显得尤为重要。本研究采用问卷法对310名高职女生的成就动机与创造力关系进行了研究，结果表明：1、高职女生虽然追求成就动机大于避免失败动机的学生所占比例较高，但总体上其成就动机水平不高。2、高成就动机与低成就动机高职女生在创造合力上没有显著区别，但在不同难度创造任务的选择及完成的情况上有区别。3、高成就动机高职女生在较具挑战性、难度水平较高的创造任务上完成得更好...Achievement motivation has come to be an important research topic on psychology as well as the core of the non-intelligence factors over recent years. And it has deep effect on personal actions or behaviors, together with their achievement. As the female status being elevated, the proportion of successful women gradually increased. In psychology, pedagogy and sociology, more and more scholars pay ...学位：教育学硕士院系专业：教育研究院_高等教育学学号：X20041700

An Analysis and Revision of Sovereign Rating Models of Rating Agencies from Financial Crisis Standpoint

随着全球经济一体化和金融一体化的不断发展，一方面，各国政府在国际资本市场上发行的主权债券越来越多；另一方面，国与国之间私人和政府投资也越来越频繁，而世界性金融危机和经济危机的频繁发生以及对各国造成的严重影响都加大了一国对外投资的风险。但是世界三大评级公司主权评级模型在金融危机和经济危机中不但没有发挥应有的预警作用还在一定程度上起到了推波助澜的作用。因此对一国主权风险进行分析和评级，对评级公司主权评级模型进行修正和改进就很有必要。虽然国外对主权风险和主权评级进行了广泛而又深入的研究，但是对主权评级模型进行的修正还比较少，而国内学术界在这方面的研究更是处于起步阶段，大部分集中在简单介绍国外对主权风...The integration of the world’s economy and finance brings both the development and the risk. More and more sovereign bonds are being issued in the international capital market, and the private and the government investment aboard are becoming more frequent. However, the negative impacts of the frequently happened international financial crisis and economic crisis increases the risk of the foreign ...学位：经济学硕士院系专业：经济学院财政金融系_金融学(含保险学)学号：1562006115098

Study of the Induced Birefringence in the Single-mode Optic Fiber

单模光纤在通常情况下可以认为是不存在双折射现象的。但当光纤受到弯曲、侧压及扭转时 ,由于光弹效应使得光纤分别产生了线性双折射和圆振双折射。该文对单模光纤由于各种作用产生的诱导双折射进行了论述 ,推导了不同情况下双折射的计算公式 ,并分析了其中的差别。同时 ,还初步分析了实际系统中对各种双折射效应的应用。In a general way, it is considered that the single-mode optic fiber has no birefringence. But once the single-mode optic fiber is bent, clamped or twisted, the externally applied stresses can lead to induced birefringences through the photoelastic effect. This paper discusses the induced birefringences, one kind of which is linear birefringence, induced by bending or lamping the fiber, while another is circular birefringence, induced by twisting the fiber. Based on the photoelastic effect, the formulas in different conditions are presented. Furthermore, the applications of those formulas in real system are mentioned

Study on Laser Triangulation Method Measurement

三角法属于主动视觉测量方法,是非接触光学测量的一个重要形式。传统的光学三角法,改之以激光光源,并结合电子信号分析电路和计算机信号处理,使测量系统可以得到较高的精度,在三维形貌测量及其他应用中已有一定的研究并有相当的前景。该文较系统地分析了不同结构、不同类型的激光三角测量系统,并比较了其优缺点。针对实际应用中出现的对测量精度的影响因素,给出了相应的解决办法。Triangulation measurement is initiative and non-contact.With the laser as lamp-house,electronic signal analyzing circuit and computer signal disposal,the triangulation measurement can achieve the higher precision,which is needed in many applications,such as three-dimension measurement,and has equivalent foreground.Laser triangulation systems with different structures and different sorts are introduced respectively and their characteristics are compared.Infective factors on precision in practice applications are discussed and the corresponding solutions

Research on coexistence between CS-DCSK UWB and narrow-band communication systems

分析了密集多径环境下码复用差分混沌移位键控(COdE-SHIfTEd dIffErEnTIAl CHAOS SHIfT kEyIng,CS-dCSk)超宽带(ulTrA WIdEbAnd,uWb)通信系统在单个和多个窄带干扰(nArrOW bAnd InTErfErEnCE,nbI)信号下的比特误码率(bITErrOr rATE,bEr)性能。建立CS-dCSk uWb系统仿真模型,并通过采样扩展方法推导出bEr的表达式,从而得到系统在不同干扰条件下的bEr性能。分析和仿真结果表明,nbI信号对系统有明显干扰作用,但系统性能在不同频率干扰下保持稳定。The performance of code-shifted differential chaos shift keying(CS-DCSK) ultra wideband(UWB) communication system under single or multiple narrow band interferers is analyzed in dense multipath environments.The bit error rate(BER) is derived on the basis of the sampling expansion approach under different interference strengths.The simulations and analyses demonstrate that the NBI signal interferes significantly the performance of system.However,the system performance keeps stable under interferer with different frequencies.国家自然科学基金(61001073;60972053); 欧盟FP7(294923)~

Reduce Ohmic Contact Resistance to p-GaN Using InGaN/AlGaN Superlattice

提出用P-IngAn/AlgAn超晶格作为P-gAn的接触层来获得低阻欧姆接触。通过一维薛定谔方程和泊松方程的自洽求解,得到了在极化效应影响下的IngAn/AlgAn,IngAn/gAn和gAn/AlgAn三种超晶格中Mg杂质离化率的空间分布。计算发现IngAn/AlgAn超晶格具有最高的Mg杂质离化率及最佳的空穴局域作用。最后,利用P-IngAn/AlgAn超晶格实验上实现了比接触电阻率为7.27x10-5Ω.CM2的良好欧姆接触。In order to achieve a smaller Ohmic contact resistance,p-InGaN/AlGaN superlattice was proposed to be used as the cap-layer of p-GaN.By making use the self consistent Poisson-Schrodinger calculations,obtained were the distributions of the ionization rate of Mg dopant in InGaN/AlGaN,InGaN/GaN and GaN/AlGaN superlattices when taking into account of the effect of polarization.It was found that the InGaN/AlGaN superlattice cap-layer had the largest ionization rate of Mg and the best confinement of the holes.Finally,the specific contact resistance of 7.27×10-5 Ω·cm2 was realized.国家自然科学基金项目(60276029);国家“863”计划项目(2004AA311020;2006AA032409);福建省科技项目(2006H0092;A0210006;2005HZ1018

细胞色素c在经预处理的金电极上电化学行为的研究

本文观察到了吸附态和本体态的细胞色素ｃ在经预处理的金电极上的准可逆反应。采用现场ＦＴＩＲ光谱法、紫外可见反射光谱法、循环伏安法、交流阻抗法和电位阶跃法研究了细胞色素ｃ吸附行为和反应动力学。结果表明，细胞色素ｃ能够满单层、不可逆地吸附在金电极表面。在无促进剂存在情况下，吸附的细胞色素ｃ层能够成为溶液相细胞色素ｃ在电极上进行氧化还原反应的电子递体

Development on AlInGaN/GaN PIN Ultraviolet Photodetectors

用AlInGaN四元合金代替AlGaN作为PIN探测器的有源层,研制出AlInGaNPIN紫外探测器。详细介绍了该器件的结构设计和制作工艺,并对器件进行了光电性能测试。测试结果表明,器件的正向开启电压约为1.5 V,反向击穿电压大于40 V;室温-5 V偏压下,暗电流为33 pA,350 nm处峰值响应度为0.163 A/W,量子效率为58%。Using AlInGaN instead of AlGaN as the source film of a photodetectors,an AlInGaN-based PIN UV photodetector was developed.Its device structure and fabrication processing are introduced in detail.Measurement results show that its turn-on voltage is about 1.5 V,and VBR>40 V;under-5 V bias voltage at room temperature,the dark current is about 33 pA;the peak responsivity can reach 0.163 A/ W at 350 nm,and the quantum efficiency is 58%.国家自然科学基金项目(60276029);; 国家“863”计划项目(2004AA311020,2006AA032409);; 福建省科技项目和基金项目(2006H0092,A0210006,2005HZ1018