852 research outputs found
Design and Implementation of Online Environmental Monitoring System Based on B/S
随着社会经济的快速发展和人类生活水平的逐步改善,人类在创造所需物质文明的同时,环境污染和生态破坏也在日益加重。传统的环境监测系统缺乏长时间的、具有代表性的监测数据,无法适应长期有效管理机制的需求,所以需要一种远程的在线环境监测系统。随着计算机网络技术的快速发展,建立一套自动化的环境在线自动监测系统,是环境监测发展的一个必然趋势。它能及时反映环境质量,实时跟踪污染源的变化,能准确预测各种突发环境事件。 针对传统监测方法的缺陷,本文基于B/S架构进行在线环境监测,利用GIS、ArcGISServer、Ajax、Oracle数据库等技术构建了一个功能较为完善的在线监测系统,实现了大气环境、地表水环...With the rapid development of social economy and improvement of living standard, environment pollution and ecological damage is being aggravated while human creates necessary material civilization. Traditional environmental monitoring system cannot adapt to the requirement of a long-term effective mechanism due to the shortage of long-time and representative motoring data. Therefore, we need a rem...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323223
High-performance liquid chromatography-mass spectrometry-based acetylcholinesterase assay for the screening of inhibitors in natural medicinal plants
酶是治疗多种疾病的重要靶标,乙酰胆碱酯酶(AChE)的抑制剂是现阶段治疗阿尔兹海默症(AD)最有效的一类药物。从天然产物中寻找适宜患者长期服用、毒副作用小、作用面广等优点的乙酰胆碱酯酶抑制剂(AChEIs)受到了科研工作者的广泛关注。本论文以AChE作为药物靶标,构建基于高效液相色谱-质谱联用技术(HPLC-MS)的在线生物活性检测方法,发展集分离纯化、结构确证和活性筛选于一体的活性导向天然产物研究方法,用来寻找和发现天然药用植物中潜在的AChEIs候选化合物。 本文首先通过影响酶促反应的因素和系统仪器参数的设定这两个方面进行了反复的考察和优化,确定最适宜的实验条件。样品经过HPLC分离之后...Enzymes are an important class of targets for treatment of various diseases. Because of the potential use of enzyme inhibitors as therapeutic agents, there is a general interest in development of screening procedures to identify novel enzyme inhibitors. Inhibition of acetylcholinesterase (AChE) is considered a promising strategy for the treatment of neurological disorders such as Alzheimer’s disea...学位:医学硕士院系专业:药学院_药物分析学学号:3232013115341
Effects of olive oil on osteoporosis after artificial menopause
随着妇科恶性肿瘤发病率的逐年上升及越趋年轻化,给社会和家庭带来了巨大的经济和精神负担。妇科恶性肿瘤主要以手术为主,并辅以放化疗。随着手术切除双侧卵巢及放化疗对卵巢损害的发生,将会导致雌激素急剧下降,从而增加骨质疏松症的发病率。目前激素替代疗法(hormonereplacementtherapy,HRT)广泛用于防治人工绝经后骨质疏松症,但是有临床大样本研究表明,HRT虽然能够减缓绝经后骨质疏松症的发生,但也增加了心血管疾病、乳腺癌、中风、糖尿病、宫颈癌、子宫内膜癌、卵巢癌等的发病率。因此寻找更加安全有效的防治妇科恶性肿瘤术后骨质疏松症的方案是目前的当务之急。有研究表明,橄榄油不仅可以减少骨量丢...The prevalence of gynecologic malignant tumors are increasing and the age at onset has become younger in recent years,which causes a big economic burden and mental strain to the society and to families.Surgery is the most important treatment for gynecologic malignant tumors,that supplemented by radiotherapy and chemotherapy.However,an ovariectomy of both sides and the damage of radiotherapy and ch...学位:医学硕士院系专业:医学院_妇产科学学号:2452012115311
同步协作信息检索模型及其机制研究
通过分析当前用户协作信息检索的相关理论和系统实践,总结其中存在的一些问题,确定用户同步协作检索中要解决的三个关键问题:检索任务的分配、群组查询历史的重用和协作感知,提出一个用户同步协作信息检索模型,并在该模型中对要解决的这三方面的问题进行阐述
Interaction between Clans and Village Elections:a Case Study Based on the Story Happened in a Village of X
以村委会选举为核心的村民自治制度自实施以来,即引起了众多国内外有关专家、学者的关注,他们从不同研究角度对该制度的实际运作状况进行了深入的研究。村委会选举这一制度,是国家为便于乡村治理、加强基层民主建设而从外部输入给农村的,那么这一制度在由外向内输入的过程中,如何与农村社区环境“对接”,村民怎样看待村委会选举并以何种方式或途径参与村委会选举等,是一个十分重大的问题。村民和农村原有的机制并不会在牵涉到村庄权力与资源重构的制度面前丧失自己的主体性,相反,他们会寻求“恰当”的方式与正式制度进行博奕。 中国是一个家族传统厚重的国家,自20世纪80年代农村改革之后,在农村出现了家族的普遍复兴,而复兴中的...Since the Law of Village elections tried out in rural China, many experts and scholars at home and abroad have researched its’ practical operation deeply from different perspectives. In order to manage Rural China and strengthen its’ construction of democracy, government constituted this system. Due to it was inputed from outside Rural China,so in the process of inputing it ,we must think about ho...学位:法学硕士院系专业:公共事务学院社会学系_社会学学号:1332005130067
Studies of Contents, Composition and Seasonal Variation of Nitrogen, Amino Acid and Carbohydrate in Nature Colloids
摘要 本研究分别以厦门湾东南部海域、九龙江河口和九龙江河流的水体作为海洋、河口和河流水体的代表,于2005年8月~2006年5月分4个航次分别采集了3种水体的水样,利用错流超滤技术提取了水体中的胶体,分析了胶体相(10kDa~0.2μm)、真溶液相(<10kDa)和溶解相(<0.2μm)中氮、氨基酸和碳水化合物的组成与含量,研究了各种形态的氮、氨基酸和碳水化合物在3种相态中的分布,探讨了胶体中氮、氨基酸与碳水化合物的来源和转化。研究结果如下: 1.从九龙江河水到厦门东南部海域海水中各种形态的氮、氨基酸和碳水化合物的含量依次降低,说明陆源输入是海洋和河口水体中氮、氨基酸和碳水...ABSTRACT The concentrations, distribution and seasonal variations of nitrogen, amino acids and carbohydrates in nature colloids were examined in surface waters of southeast Xiamen Bay, Jiulongjiang River estuary and Jiulongjiang River of China. Water samples were collected during August 2005 and May 2006 and fractionated into total dissolved (<0.2μm), colloidal (10kDa ~0.2μm) and absolutely di...学位:理学硕士院系专业:海洋与环境学院海洋学系_海洋化学学号:20032701
A Study of Environmental Regulation Impacts on Foreign Direct Investment: Empirical Evidence from China
关于环境规制对FDI的影响,学术界主要有两种不同假说。一是“污染避风港”假说(PollutionHavenHypothesis),认为一国严格的环境规制对企业意味着环境成本提高,从而降低该国的比较优势,为追求利润最大化、规避母国的环境规制,跨国公司倾向于将污染密集型产业转移至环境标准相对宽松的国家,使得这些国家逐渐沦为污染的聚集地。波特假说(PorterHypothesis)则持相反观点认为,从动态的角度看,环境规制水平的提高为企业创造改革的动力,严厉的环境规制将激励企业进行管理和技术创新,进而降低企业的生产成本,通过创新补偿和先动优势的作用,环境规制从长远来看是可以提高企业的国际竞争力,从而...Regarding the impact of environmental regulations on FDI, there are two main different points of view in the academic circle. One view is that strict environmental regulation means an increase in environmental cost for enterprise, and to maximize the profit and avoid the environmental regulation, multinational companies tend to transfer the pollution-intensive industries to the countries with rela...学位:经济学硕士院系专业:经济学院国际贸易系_国际贸易学学号:1572008115196
Duanzi Writers’ Micro-blogging Marketing and Its Effects of Consumer Behavior: An Empirical Study
本文以段子手微博为研究对象,探究微博营销对消费行为的影响,通过网络问卷调查收集问卷,利用SPSS19.0软件对收集的调查数据进行统计分析。 结合文献分析、小规模深度访谈,以及问卷调查的因子分析结果,研究发现,微博段子手营销效果的影响因子有六个,分别是:信息趣味性、品牌或产品、促销、段子手、活跃度和互动。 研究结果表明,微博营销效果的影响因子中的信息趣味性、品牌或产品、互动通过搜索意愿对消费者的购买意愿产生影响,即搜索意愿是这些因子与购买意愿的中介变量。微博营销中的促销因子则可以不通过搜索意愿直接影响消费者的购买意愿。具体来看,品牌或产品、互动与搜索意愿、购买意愿都呈现正相关,即消费者对微博...This paper explores the impact of micro-blogging marketing on consumer behavior, treating the Duanzi writers as the subjects. Statistics analysis software SPSS19.0 was applied to deal with the network survey data. By literature reviewing, small-scale in-depth interviews, and factor analysis of questionnaire data,this research found six factors in micro-blogging marketing: information interest...学位:文学硕士院系专业:新闻传播学院_传播学学号:3192011115290
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