3,167 research outputs found
Remote Sensing Retrieval Algorithms and Spatial-temporal Characteristics of POC in the South China Sea
颗粒有机碳(ParticulateOrganicCarbon,POC)是海洋生物地球化学过程的重要组成部分,随着光学技术和遥感手段的进步,在不同时空尺度下监测POC取得很大突破。本文以2011年国家自然科学基金委南海共享航次现场光学数据为基础,探索适用于南海POC反演的海色卫星遥感算法,将算法应用到卫SeaWifs遥感反射比Rrs(λ)数据,得到南海月平均POC,并分析其在季节和年际时间尺度上的时空变化特征。 首先,依据现场观测遥感反射比Rrs(λ)和POC,用多种方法来估算南海表层POC浓度。本文比较了单波段经验算法,双波段蓝绿遥感比值法以及两步算法(先由Rrs(λ)计算后向散射系数bbp...Particulate Organic Carbon (POC) is an important component of biogeochemistry. With the development of optical technology and the remote sensing technology, the measurements of POC in different spatial-temporal scales had made breakthrough progresses. South China Sea (SCS) is a marginal sea of West Pacific Ocean; however, there are few POC remote sensing researches here. This paper tried to explor...学位:理学硕士院系专业:海洋与环境学院_环境科学学号:2262010115140
Design and Implementation of Human Resource Management Information System of Power Corporation
集团公司人力资源管理信息建设是在引入先进的人力资源管理理念,优化业务流程的基础上,建设一个覆盖全集团的满足集团管控、信息共享、流程优化、业务协同、全员应用的人力资源信息管理平台。通过系统平台的构建,能够实现全集团人力资源信息数据的集中统一管理,业务处理流程的规范标准,人力资源信息的协同共享;通过对人力资源相关数据的统计分析,为企业人力资源的优化配置提供决策支持。 本文从集团公司人力资源管理的特点及管控要求出发,明确了集团总部集中部署,支持总部、各级单位分级应用的模式进行建设。通过对人力资源管理基础数据标准与信息规范进行统一设计,以其中的组织岗位管理、员工管理、薪酬管理、社保管理等功能模块为例...Human Resource Management Information System project is the introduction of advanced human resources management concept, optimize business processes, based on the construction of a covering the whole group to meet the Group's control, information sharing, process optimization, business collaboration, the full application of human resources information management platform. By building Platform enab...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323151
Design and Implementation of the United Tax System Based on Local Tax and National Tax Authorities in a City
某市国地税联合办税系统将国税和地税等税务系统进行了连接,通过信息资源共享,实现资源整合。它提高了工作效率,缩短了纳税人办证缴税时间,减轻了纳税人负担,同时为提升信息管税水平奠定了坚实的基础。 运用现代信息和互联网技术,建立了一个为纳税人提供优质服务的平台,提高了前台工作效率,提高了税收数据质量,节约了税务机关人力资源,提高了办税便利性,节约了纳税人办税成本。 基于J2EE架构的某市国地税联合办税系统分析与设计,可以得出需要主要解决纳税人登记、国地税信息共享等问题。论文主要工作包括: 1、完成了地税联合办税系统需求分析,采用例图、系统用例描述等工具表达了系统功能需求。 2、完成了包括设立...The united system of national and local authorities will connect their own individual systems. It can realize information sharing and resource integration. It can improve work efficiency, shorten the tax time of taxpayers, and reduce the burden of taxpayers. Of course it has laid a solid foundation for improving tax information management. Modern information and internet technology are used to hi...学位:工程硕士院系专业:软件学院_软件工程学号:X201323134
Research on Modified Interpolation and Solving of Topology Optimization Based on Variable Density Method
拓扑优化是在给定载荷、约束等条件下,寻找材料在设计域内最优布局的优化设计方法。在概念设计阶段具有重要意义,可以帮助设计者选择合适的初始拓扑结构。与传统设计方法相比,具有设计效率高,提高材料利用率等优点。从经济方面来看,拓扑优化可以减少设计成本、节约原材料,是结构设计中公认回馈最高的优化方式,已经成为结构设计中的研究热点,对其进行研究具有重要的理论意义及工程应用前景。 本文分析了国内外拓扑优化方法的研究现状,总结了拓扑优化有关理论、方法及应用方面的研究进展,在此基础上针对变密度法拓扑优化方法中SIMP(Solidisotropicmicrostructurewithpenalization)材...Topology optimization is to seek the optimal material distribution in design domain under given loading and constrains. It's important in conceptual design phase, and this method can help the designers to decide what the structure looks like. In contrast to traditional method, topology optimization has the features of low design cost and high developing efficiency etc. From an economic perspective...学位:工学硕士院系专业:航空航天学院_机械制造及其自动化学号:1992013115288
Development and Optimization of a Cylindrical Laminated Methanol Steam Reforming Microreactor with Porous Metal as Catalyst Support
摘要 以低碳醇为燃料的制氢微反应器可为燃料电池等微小型电子装置提供安全可靠的在线氢源,从而引起世界各国研究者的广泛关注。本文以多孔金属材料为载体,设计制造了一种新型层叠式柱形甲醇水蒸气重整制氢微反应器,可获得较佳的制氢效果。论文主要研究内容如下: (1)载体结构甲醇水蒸气重整制氢微反应器设计 利用Solidworks软件设计了一种新型层叠式柱形甲醇水蒸气重整制氢微反应器。其中蒸发腔设计栅板结构,可有效增强反应溶液的汽化效果以及重整腔入口流体分布的均匀性。载体板采用多孔金属材料,降低加工成本,提高催化剂的负载性能以及反应器的传热传质效果。 (2)泡沫金属载体制氢反应器的制氢性能研究 以...Abstract In recent years, microreactors for hydrogen production fueled by hydrocarbons successfully provided the on-line hydrogen source for PEMFC. Therefore, microreactors has prospect of providing hydrogen for microelectronics powder equipment. In this dissertation, porous metal fiber sintered felt(PMFSF) and metal foams were used as catalyst supports for constructing a new type of cylindric...学位:工学硕士院系专业:航空航天学院_机械制造及其自动化学号:1992013115288
The study of one-dimensional flow analysis model of the combustor in supersonic combustion experiments
对公开发表的用于超声速燃烧流场分析的几种一维模型进行了研究,指出了其中存在的问题,研究结果表明:基于实验静压数据的一维模型,若不借助必要的流场测量数据或分析结果,或借助于经验性的处理方法,单靠一维假设,无法获得较为完整的一维流场分析结果。改进后的一维模型降低了数据处理过程中的不确定性,提高了对一般情况的适应能力。用编制的计算程序SSC-2对两组典型的超燃燃烧室壁面静压实验数据进行了演算,取得了燃烧室出口总压恢复系数的计算值与测量值基本一致的好结果
Analysis of the Jewish-American Intellectual’s Image in Herzog
《赫索格》是索尔·贝娄最具代表性的作品,也是一部经典的知识分子小说。该小说的主人公赫索格是个集犹太性和美国性于一身的角色,也是在物质社会中遭遇精神困境的20世纪60年代美国知识分子的代表人物,他具有知识分子所共有的特征,如渊博的知识、高尚的道德以及傲气等等。赫索格因为两重背景的影响而被外部世界异化并且丧失了话语权,于是靠不断写信来释放精神压力并借此重新确立自己的位置和身份,但一无所获。后来他通过不断地思索与行动,终于在美好人类感情的帮助下得到解救,他的内心世界和外部世界有了直接对话的机会,找到了心灵的宁静之所。赫索格一方面是个受害者,另一方面却作为一个父权论者有意无意地压制女性知识分子马德琳追...As Saul Bellow’s most representative work, Herzog is widely accepted as a classic intellectual novel. The protagonist Herzog is a combination of Jewish features and American features and an everyman of the American intellectuals in the 1960s who suffer from spiritual predicaments in a materialized society. Herzog has typical intellectual characteristics such as profound knowledge, morality and alo...学位:文学硕士院系专业:外文学院_英语语言文学学号:1202013115274
近25 a 银川市城市化进程中热力景观格局演变分析
Abstract: Based on the Landsat images and statistical data,in this paper the urbanization process and thermal landscape dynamics of Yinchuan City were analyzed. The objectives of this study were as follows: ① To analyze the spatial and dynamic characteristics of urban thermal landscapes based on the landscape pattern index; ② To assess the influence of the urbanization process on the thermal landscapes; ③ To understand the relationship between the land use pattern and the land surface temperature ( LST) based on the distribution index. The results showed that there was a significant heat-island effect in Yinchuan City,and the high temperature area was consistent with the built-up area and the unused land. LST declined from the downtown to the suburbs,and an obvious difference of the dynamic characters of the thermal landscapes could be identified at the different stages of urbanization. LST for various land use had obvious discrepancies,the mean LST for the land use types was in a descending order of unused land,construction land,green land and water body. Different land use types had different thermal distribution at different stages of urbanization. The land use pattern influenced the urban thermal environment,especially the spatial distribution of green land and unused land affected LST more significantly
不同攻角下超声速降落伞伞绳的影响研究
文章基于一种简易"浸入边界技术"与流固耦合方法对超声速来流条件下的三维降落伞系统进行了数值模拟。研究中,降落伞系统包括前体和伞体,两者通过伞绳连接。文章的研究目的是分析不同攻角下降落伞伞绳对于降落伞系统周围复杂非定常流场的影响,以及对降落伞性能表现的影响。结果表明:在较小的前体和伞体距离下,由于攻角的影响,非定常流场结构呈现上下不对称,并且上下伞绳激波形成时间不同步。随着攻角的增加,上下面的伞绳激波形成时间出现推迟,并且有变弱的趋势。另外,由于攻角与伞绳的综合影响,伞内表面的时间平均压力分布在5o攻角时最小,而在10o攻角时最大,阻力系数却随着攻角的增加而增加
Tunable Aggregation and Chemical Sensing of Bornic Acid Based Organic Dyes
化学传感是超分子化学的一个重要分支,近年来引起了国内外专家学者的广泛关注,尤其是针对一些在动植物生命过程和环境中起重要作用的生物小分子的识别。设计具有高选择性和高灵敏性的生物小分子识别主体倍受青睐,同时也颇具挑战性。基于超分子聚集的化学传感体系,作为化学传感领域的新兴分支,相比于传统的小分子化学传感器,往往具有更高的灵敏度和选择性,以及识别单元简单易得等独特优势。本论文以此为出发点,考察了通过对硼酸基有机染料的诱导聚集、解聚以及聚集体的相互转化过程实现糖基生物小分子的识别。本论文共分为以下五章: 第一章简要介绍了硼酸与邻二醇结合的基本原理以及结合过程所涉及的影响因素,并举例分析硼酸基传感体系...Chemical sensing is one of the most important parts of supramolecular chemistry, and the development of sensitive and selective chemosensors for some biologically relevant species are of intense current interest since these species play important roles in our living system and environment, but it is still a large challenge to realize recognition for these species with high sensing performance. As ...学位:理学博士院系专业:化学化工学院_分析化学学号:2052014015390
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