2,578 research outputs found

    Simulation and Process Optimization Research of CuInGaSe2 Thin Film Solar Cells

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    人类对能源消费的不断增加,传统化石能源的快速消耗导致环境恶化加剧,雾霾等恶劣气候频发,严重影响人类的身体健康和生存,寻找可再生清洁能源成为全球共同追求的目标。太阳能是一种可持续的清洁能源,受到科学家的热衷追捧,而光伏产业作为无污染的新能源产业获得世界各国青睐而得到广泛应用。 以中国光伏产业为代表的发展中国家,其新能源产业以前所未有的速度发展,对世界新能源产业做出巨大贡献,但是由于发达国家的贸易“双反”政策及国内市场开发不足导致以晶硅为主的中国光伏产业遇冷,而薄膜太阳电池却未受到双反的限制。铜铟镓硒(CIGS)薄膜电池是一种高效率、超廉价的薄膜电池,它的研究受到世界各国研究者的重视,同时由于C...Energy consumption for human society has been accelerated and the large exhaustion of traditional fossil fuels has led to the deterioration of the environment, forming severe climatic such as fog haze, which seriously influences human health and survival. It is becoming a global common goal to find the sustainable renewable and clean energy. As a kind of sustainable and clean energy, solar energy ...学位:理学博士院系专业:能源研究院_光伏工程学号:3242012015367

    The influence of the electrical boundary condition on domain structures and electrocaloric effect of PbTiO3 nanostructures

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    本文在基于金兹堡—朗道—德文希尔唯象理论的相场法理论下,应用有限差分方法及四阶龙格—库塔法数值求解,研究不同电学边界条件对铁电纳米点畴结构演化和热电温度效应的影响。本文所用的中间电学边界条件,可以用来表示表面电极与纳米点之间的黏合情况及电极对表面电荷的补偿情况,进而说明退极化电场和退极化电能对系统自由能的影响,不同以往的对退极化能进行权重处理,具有实际的物理意义。 当电学参数λ0为0时,中间电学边界可以退化为开路电学边界条件;当λ0趋向无穷大时,对应于短路电学边界条件,即表面电荷可充分补偿。λ0的值越大,表明表面电荷部分补偿的程度越大,退极化电场能减小得越多。数值计算纳米PbTiO3(PTO...Phase field method based on Ginzburg-Landau-Devonshire theory is applied to study the evolution of domain structures and electrocaloric effect (ECE) of ferroelectric nanoparticles. The phase field equations are numerically solved by finite difference method and four-order Runge-Kutta method. Two-dimensional simulations of PbTiO3 (PTO) nanostructures are performed under the intermediate (IM) electr...学位:工学硕士院系专业:材料学院_材料学学号:2072013115006

    Political Connections、Government Subsidies and Enteprise Perfrmance——An Empirical study based on The Companies Listed on GEM

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    近年来,关于经济活动的两大参与主体─企业和政府之间关系的研究日益增多,企业为政府提供产品,政府为企业提供交易环境,市场作为经济活动发生的场所,在调节经济运行过程中免不了会暴露各种问题,企业面临制度上的失效。在法律制度和约束机制尚不完善的地区和国家,私人产权无法较好地受到保护,不少企业转而开始和政府之间建立“亲密关系”,以此作为在转型经济中克服制度缺陷的有效替代性机制。当然,也有部分学者指出企业建立政治关联其实是出于“寻租”。另一方面,我国政府每年拨付大量资金对上市公司进行补贴,补贴金额逐年增加,补贴方式日趋多样化,不少学者认为我国民营企业高管积极和政府建立关系,是为了获得更多政府补贴。 本文...Recent years, more and more scholars begin to study relations between government and frims.The government provide trade environment while enterprise provide goods. There are many problems when market is adjusting the economic operation. Enterprise has to handle the failure of system. The legal system and constraint mechanism is not perfected in many regions and countries, Private property rights c...学位:经济学硕士院系专业:经济学院_西方经济学学号:1722013115199

    Research of Urban Lakes and River Basin Water Pollution Countermeasures --- A Case of Xiamen’s Yundang Lake

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    当前我国湖泊及其流域水环境污染、水体恶化等问题日益突出,水资源与整体水环境建设面临着十分严峻的形势,如何处理好湖泊及其流域水资源、水环境保护与经济社会发展的和谐共存,是我国社会经济转型时期面临的重大考验之一。党的十八大提出生态文明建设,把其融入到经济建设、政治建设、文化建设、社会建设各方面,开启了我国文明建设的新篇章。而湖泊及其流域的水资源作为自然生态的重要组成部分,其环境建设必然摆在生态文明建设的显著位置。厦门市作为优美的海滨城市,水资源、水生态建设问题更为突出,同时又事关社情民生,本文将以厦门市筼筜湖流域水污染整治为例,以共同治理的视角,分析实际对策与运用实践,总结历次整治工程与治污、水环...At present, the problems of water environment pollution and water deterioration in the lakes and rivers are becoming serious, also, water resources and water environment building are facing a grim situation. Otherwise, how to handle the harmonious coexistence of water resources, water environment protection and social economic development, is one of the major challenge during the transition period...学位:公共管理硕士院系专业:公共事务学院_公共管理硕士学号:1392013115033

    Design and Implementation of Campus One Card Through System of Some Vocational College

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    校园管理水平和教学质量的信息化是高校信息化建设的核心,只有管理上的难题能逐步解决才能促进其他工作的稳步发展。基于此背景急需建设“数字化校园一卡通系统”,对高校数字化管理的提升起到重要作用,只有加强信息整合和信息综合利用,完成一卡通建设才能更便于学生的学习和工作,使其不需为各种消费问题浪费时间,也使得校园各部门的管理不再独立,重复建设各自的系统而缺乏部门之间的信息沟通和信息共享。一卡通的建设一方面方便了教师和学生的用卡,另一方面简化了校园后勤管理服务内容、银行系统的对接等繁杂工作,有利于高效管理工作的智能化和高效化。 论文主要完成以下几方面的工作: 1.对“校园一卡通系统”的研究现状进行考察...Campus informatization of management level and teaching quality is the core of the information construction of colleges and universities, only the management difficulties can solve step by step to promote the steady development of the other work. Based on this background are in urgent need of construction of “digital campus all-in-one-card system”, the promotion of digital management in colleges a...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323175

    Design and Implementation of Students Grades Management Information System for Adult Education

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    教育信息化是我国进行教育深化改革的重点举措之一,教育信息化建设已经取得了重大的进展,但各地和不同领域的发展还很不平衡。在成人教育领域的信息化发展一直比较滞后,日常的教育和教学的大部分工作仍然处于半自动化管理阶段。随着成人教育学校办学规模逐渐扩大,学生也越来越多,学生的学籍信息管理工作也变的越来越复杂。学生学籍管理的规范性和科学性,已经成为各个成人教育院校关注的重点问题。 基于以上问题的研究和分析,利用软件技术和网络技术开发一个面向成人教育的学生学籍信息管理系统是缓解以上问题的最好方式,本文将依据软件工程理论设计和实现该系统,本文的主要工作内容如下: 1、整理相关资料并与成人教育管理部门的学...Education informatization is one of the important measures for deepening the reform of education in China, the education informationization construction has made great progress, but the country and different areas of the development is not balanced. Development of information technology in the field of adult education has been lagging behind, most of the daily work of education and teaching is sti...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323001

    Study on the Zooplankton Functional Groups in Taiwan Strait during Spring, Summer and Autumn of 2015

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    本文根据2015年春季(3月~4月)、夏季(6月~7月)、秋季(11月)三个航次对台湾海峡南、北两块区域的调查数据,对台湾海峡浮游动物的种类组成、优势种、数量分布和生物多样性的季节变化及区域性差异进行了研究。同时依照浮游动物的粒径大小和摄食习性,将其划分为水母类(Medusae,Med)、大型甲壳类(Giantcrustacean,GC)、植食性小型甲壳类(Herbivorousmicro-crustacea,HMC)、肉食性小型甲壳类(Carnivorousmicro-crustacea,CMC)、毛颚类(Chaetognath,CH)和被囊类(Tunicata,Tu)六大功能群,分析和讨论...Three oceanographic surveys were conducted in Taiwan Strait (TS) during spring (March to April), summer (June to July) and autumn (November) of 2015. The study area was geographically divided into two regions: the north and the south. Based on the data collected from those cruises, the seasonal and regional variations of species composition, dominant species, horizontal distribution and biodiversi...学位:理学硕士院系专业:海洋与地球学院_海洋生物学学号:2232014115132

    Design and Implementation of Student Online Examination System Based on Struts

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    随着信息化的发展,高校纸质考核方式逐渐不能适应社会的发展,尤其是面对一个学期有好几千学生的公共课程,采用纸质考核方式极大的增加了教师的判卷等相关工作量,如果采用在线考试系统,能快速的实现阅卷工作,提高判卷的工作效率,还可以提高判卷的准确率。因此在信息化建设的大背景下,高校采用在线考试系统逐步的成为了社会发展的趋势之一。 本文针对纸质版考试中,考试相关文件和阅卷工作给教师带来较多繁琐工作量的问题,基于Struts框架,采用Java语言和Jsp技术相结合,设计并实现了学生在线考试系统,系统主要研究内容如下: 1、本文基于Struts框架,采用分层结构设计,数据库采用MySql数据库,设计并实现...Along with the development of informatization, the paper appraisal way gradually can not adapt to the development of the society, especially in the face of a semester, thousands of students of the course by paper examination way to greatly increase the workload of teachers' judgment related, if the online examination system, can quickly realize marking work, improve the efficiency of the paper wor...学位:工程硕士院系专业:软件学院_软件工程学号:X201323041

    The Path、Effect and Evaluation of “Tripartite System Reform” in Sanming City

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    近年来,福建省三明市为解决城镇职工基本医疗保险基金连年赤字问题,展开了以“医疗、医保、医药”为抓手的三医联动改革,对全市22家县级以上公立医院的医疗保障系统进行了重新设计。实施几年来,效果明显,初步实现了医院、医保、医生、患者、政府的多方共赢,引起了中央到地方的高度关注。 本文正是在三明医改取得广泛关注的背景下进行的研究,通过全面梳理三明市“三医联动”改革的路径、客观的对比改革前后的效果并对三明市医改进行系统的评析,以此来展望三明医改可借鉴的地方。一是全面系统的对三明市在医疗改革、医保改革、医药改革三方面的改革措施进行概述,阐明三明医改的内涵所在,明晰三明市“三医联动”改革路径;二是客观详细...In recent years,in order to save the urban medical insurance fund which loss in these two years.Sanming City,Fujian province started to carry out inter-acting of medical service,insurance and pharmacy system.Redesign the health sector system in all of the 22 public hospitals in Sanming. It has achieved win-win results among hospital,insurance,doctor,patient and the government after reform,which dr...学位:公共管理硕士院系专业:公共事务学院_公共管理硕士学号:1512014115030

    Research on University Library's participation in public cultural service ——Taking Xiamen University Library as an example

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    图书馆的发展宗旨是传播知识,服务于人。作为公共文化体系重要组成部分的公共图书馆由于历史和其他客观原因,其数量和藏书量还不能满足社会对它的需求,且存在地域发展不平衡的问题。而作为我国图书馆体系三大支柱之一的高校图书馆,长期以来只为本校师生服务,不参与社会公共文化服务。教育部《普通高等学校图书馆规程》提倡高校图书馆在保证校内服务和正常工作秩序的前提下,开展社会化服务。近年来已有多个高校尝试对外开放,参与公共文化服务。 本文通过论述公共文化服务的相关概念和理论基础,指出高校图书馆属于准公共产品的属性,既有公共性又有竞争性。本文以大量的文献调研为基础,比较国内外高校图书馆公共文化服务,再以厦门大学图...The purpose of library development is to disseminate knowledge and serve people. Public libraries, as an important part of the public cultural system, are unable to meet the needs of the society due to historical and other objective reasons, and there is a problem of uneven regional development. As one of China's Library System of the three pillars, University Library a long time just service for ...学位:管理学硕士院系专业:公共事务学院_公共管理硕士学号:X201113605
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