419 research outputs found
Design and Implementation of Hospital Management Information System
摘要 当今社会,网络飞速发展,生活节奏不断提高,在大数据时代的背景下,提高医院的服务质量是医院管理水平的一个重要衡量标准,是提高医院医护和管理人才服务病人的有效手段。大规模网络覆盖的条件下,可以实现医院更好的提高医院管理快速、准确、高效的工作模式,所以,开发一套实用且扩展性、稳定性、操作性较好的医院住院管理信息系统,通过信息化的管理手段,解决医院的管理复杂问题,促使现代医院营运更加高效。 本文主要完成基于B/S架构的医院住院管理信息系统的设计和实现。以某市第一人民医院的实际需求为背景,使用JAVA语言,Oracle数据库构建了基于该医院住院管理信息系统。首先,对该医院的平时病人住院情况进行...ABSTRACT In today, the rapid development of network、the pace of life continues to improve, the level of hospital management is an important measure to improve the quality of hospital service is an effective way to improve the hospital management and patient service personnel. Large scale network coverage conditions, can realize the hospital improve the hospital management fast, accurate and effic...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201323131
Research on China's Real Estate Cycle Fluction
房地产业在发展过程中客观存在着周期波动现象,从我国房地产发展历程来看,房地产业经历了一条曲折的发展之路。分析房地产周期波动,不但具有理论上的开拓意义,而且也有助于在实践中指导房地产业的健康发展。正视房地产业的周期波动现象,分析房地产周期波动的内在机制和主要影响因素,对我国房地产业的健康、稳定发展具有现实的指导意义。本文由四部分组成:第一部分提出了房地产周期研究的背景、理论及现实意义,以及中国房地产业的发展历程。第二部分总结和归纳有关房地产周期波动的理论。首先阐述了国外对房地产周期的研究历程和主要研究成果;其次总结了港台及大陆对房地产周期的研究。第三部分分析了房地产周期波动的传导机制与主要影响因...The development of real estate industry shows a periodic fluctuation phenomenon. In China, the real estate industry also experienced periodic development. Analyzing the cycle of real estate industry, not only has significant theoretical implications, but also can promote the development of real estate in practice. Analyzing the internal mechanism and the main factors that influence the real estate...学位:经济学硕士院系专业:经济学院计划统计系_国民经济学学号:20021000
Estimating Submarine Groundwater Discharge into the Jiaozhou Bay Using ~(226)Ra
海底地下水排泄(SGD)是全球水循环的一个组成部分,其输送的溶解物质不仅参与海洋的生物地球化学循环,而且影响近岸海域的生态环境。为了评估胶州湾海底地下水排泄状况,通过建立胶州湾内海水中226Ra的质量平衡模型来计算海底地下水排泄通量。胶州湾海水中226Ra的源主要有河流的输入、沉积物扩散输入和地下水的输入,海水系统在稳定状态下,这几种源应该与湾内海水和湾外海水的混合损失达到平衡。除了将地下水输入作为未知项外,对其他源和汇逐个进行量化,计算得知:2011年9—10月胶州湾的海底地下水排泄通量为7.85×10~6m~3·d~(-1);2012年4—5月胶州湾的海底地下水排泄通量为4.72×106m~3·d~(-1)。在此基础上,对地下水输入胶州湾的营养盐进行了评价。Submarine groundwater discharge( SGD) is a part of global water cycle,which delivers a large amount of solutes to the biogeochemical cycle and affects the coastal ecological environment. The ~(226)Ra mass balance model was established to estimate the submarine groundwater discharge to the Jiaozhou Bay. The ~(226)Ra sources include river transport,sediment diffusion and SGD,these sources should be in balance with the mixing loss of the bay water and open seawater when the seawater system is in the stable state. Except for the SGD was unknown item,other sources and sinks were quantified one by one. Calculated results showed that the SGD fluxes during September to October in 2011 was 7. 85 × 106m~3·d~(-1),April to May in 2012 was 4. 72 × 106m~3·d~(- 1). Based on the SGD fluxes,the SGD derived nutrient fluxes were estimated.国家自然科学基金项目(41072174)~
Temporal and spatial variation of nutrients in the rivers around Jiaozhou Bay and its fluxes into the sea
本文选取胶州湾周边5条主要入海河流作为研究对象,于2011秋季和2012年春季,测定了河流中无机营养盐的浓度水平,调查了各河流营养盐的主要来源,分析了营养盐的时空变化及成因,并计算了营养盐的入海通量.结果表明,各流域nO-3-n、SIO2-3-SI、nH+4-n、nO-2-n浓度主要表现为秋季较高,PO3-4-P浓度春季较高.白沙河、洋河流域营养盐主要来源为面源污染;墨水河、李村河流域营养盐主要来源于工业废水和生活污水;大沽河流域营养盐主要来源于农田径流和生活污水.除nH+4-n入海通量为墨水河最高外,其余各项营养盐入海通量均为大沽河最高.dIn、PO3-4-P、SIO2-3-SI入海通量分别为373.74x103MOl·d-1、7.08x103MOl·d-1、73.16x103MOl·d-1,n∶P∶SI数量比约为53∶1∶10.River runoff is the most important discharge pathway from mainland to sea,which is one of the reasons that the eutrophication and red tide occur frequently in parts of Jiaozhou Bay.The nutrient investigations about five relatively big rivers around Jiaozhou Bay were conducted in autumn of 2011 and spring of 2012,respectively.We measured the nutrient concentrations in river water, investigated the main resources of nutrients,analyzed the temporal and spatial variations of nutrients and its causes, and calculated the nutrient fluxes to Jiaozhou Bay.Results show that the concentrations of NO-3-N, SiO2-3-Si, NH+ 4-N and NO-2-N are higher in autumn while the concentration of PO3-4-P is higher in spring.Non-point source pollution is the main source of nutrients in Baisha River and Yang River.Industrial wastewater,urban sewage and household wastes are the main sources of nutrient in Moshui River,and the nutrients originate mainly from farmland runoff and sewage in Dagu river.Except for NH+ 4-N flux which is much higher in Moshui River,all other nutrient fluxes to the sea are comparatively higher in Dagu River.The calculated fluxes for DIN,PO3-4-P and SiO2-3-Si are 373.74 × 103mol·d- 1,7.08 ×103mol·d- 1and 73.16 × 103mol·d- 1, respectively,and the ratio of N,P and Si within the fluxes is 53 ∶ 1 ∶ 10.国家自然科学基金项目资助(41072174)资
Characteristics of Radium Desorption from Sediments in the Salt Water Environment
海底沉积物向上覆水体扩散的镭是海洋水体中镭同位素的重要来源之一。为了研究沉积物中镭同位素的解吸和扩散特点,进行了不同盐度和不同粒度条件下224rA和226rA解吸的模拟实验,并通过多个时间段的沉积物培养实验获取224rA和226rA的扩散通量。实验结果表明:随着水体盐度增大,沉积物中224rA、226rA的解吸量随之增加,在盐度为25时,解吸量基本达到最大值;在同一咸水环境条件下,4个粒级(2000~1000μM、1000~500μM、500~250μM、250~125μM)的沉积物的224rA、226rA解吸量比较接近,粒级>2000μM的224rA、226rA解吸量略高于上述4个粒级,而粒级<125μM的224rA、226rA解吸量远大于上述5个粒级;胶州湾沉积物中224rA和226rA的平均扩散通量分别为0.85 bQ·M–2·d–1和0.022 bQ·M–2·d–1。Radium diffusion from sediments to overlying water is one of the important sources of radium isotopes in ocean water.A series of laboratory desorption/diffusion experiments were conducted to help elucidate the characteristics of sediments on 224 Ra and 226 Ra desorption and diffusion,which included 1) 224 Ra and 226 Ra desorption from sediments in water of different salinities,2) 224 Ra and 226 Ra desorption from sediments of different grain sizes in water of the same salinity,3) 224 Ra and 226 Ra diffusive fluxes by observing Ra enrichment with time in the overlying water of incubated sediments.The experimental results show that there is an increase in the amount of 224 Ra and 226 Ra with the increase of salinity from 5 to 30,and Ra desorption is strongest at the salinity of 25.Under the same salt water condition,224 Ra and 226 Ra desorption activities of the four grain sizes(2000~1000 μm,1000~500 μm,500~250 μm and 250~125 μm) of sediments are very close to each other.When the grain sizes of sediments are larger than 2000μm,the 224 Ra and 226 Ra desorption activities are slightly higher than those of the sediments of the above-mentioned four grain sizes.When the grain sizes of sediments are less than 125 μm,the 224 Ra and 226 Ra desorption activities are much larger than those of the above-mentioned five grain sizes.The average diffusive fluxes of 224 Ra and 226 Ra of sediments from Jiaozhou Bay are 0.85 Bq·m-2·d-1 and 0.022 Bq·m-2·d-1,respectively.国家自然科学基金项目(编号:41072174)资
The Evaluation of Submarine Groundwater Discharge in Jiaozhou Bay Based on ~(222)Rn Mass Balance
海底地下水排泄(Sgd)作为全球水循环的一个组成部分,近年来成为陆海相互作用的研究热点。地球化学示踪法是研究海底地下水排泄的主要手段。本文以环境同位素222rn作为示踪剂,通过构建222rn质量平衡模型来评价胶州湾的海底地下水排泄,并进一步估算地下水输入的营养盐。222rn质量平衡模型的源项考虑了河流的输入、沉积物的扩散、母体226rA的支持,汇项考虑了222rn的自身衰变、222rn散逸到大气的损失以及与湾外海水的混合损失,源汇项的差值则作为地下水输入的222rn通量。结果表明,2011年9—10月胶州湾海底地下水排泄通量为24.2 l?M–2?d–1,2012年4—5月胶州湾海底地下水排泄通量为7.8 l?M–2?d–1。丰水季节地下水输入胶州湾的营养盐低于河流输入的,但是枯水季节地下水输入的营养盐接近河流输入的,特别是输入的活性磷酸盐和硅酸盐很接近。Submarine groundwater discharge(SGD), an important part of global water cycle, has recently been a research focus in the field of land-ocean interaction along the coastal zone.Geochemical tracing is a major tool to study submarine groundwater discharge.Taking natural occurring isotope 222 Rn as a tracer, the authors built 222 Rn mass balance model to estimate groundwater discharge to Jiaozhou Bay, and also evaluated the nutrient fluxes transported via groundwater.River input, dispersion of sediments, and support from parent 226 Ra are considered to be the sources of 222 Rn mass balance model, whereas radioactive decay, escape from sea-water interface to air and loss in mixing with the low activity water from open ocean are considered to be the sink of the model.Thus, the imbalance of budget from the model is attributed to submarine groundwater discharge.Calculations show that submarine groundwater discharge flux to Jiaozhou Bay was 24.2 L·m–2·d–1 from September to October in 2011, and 7.8 L·m–2·d–1 from April to May in 2014, respectively.The results of the study also indicate that the nutrient fluxes derived from groundwater during the wet season are lower than those transported by the local rivers, whereas the nutrient fluxes derived from groundwater during the dry season are close to those transported by the local rivers and, what is more, soluble reactive phosphate and silicate fluxes from both groundwater and river are very close to each other.国家自然科学基金项目(编号:41072174)资
珠穆朗玛峰北坡6000m以上主要生境细菌群落特征
流式细胞技术及构建的细菌16S rRNA基因文库揭示了珠穆朗玛峰北坡6600~8000m表层雪中细菌的数量,以及6000m冰塔林、6350m冰川融水和6600m表层雪中细菌的群落特征.珠峰北坡表层雪中细菌数量高于南极地区,但与其他高山雪中相似.表层雪中细菌的数量有随海拔升高而增多的趋势,但与离子的浓度相关性不太.珠峰北坡冰冻环境中的细菌16S rRNA序列与土壤、湖泊和河流、动植物体及其他冷冻环境中细菌的相似.冰塔林、冰川融水和表层雪中细菌具不同的群落特征,Cytophaga-Flavobacterium-Bacteroides(CFB)类群细菌在冰川融水中占绝对优势,冰塔林中属于β-Proteobacteria和CFB类的细菌为优势种,而表层雪中细菌则以β-Proteobacteria和Actinobacteria类的细菌为主,不同生境中细菌群落的不同可能是由于细菌的沉积后变化引起.国家重点基础研究发展计划项目(批准号:2005CB422004);; 国家自然科学基金项目(批准号:40121101,40401054);; 中国科学院创新项目(批准号:KZCX3-SW-339);; “百人计划”项目及国际社会公益项目(批准号:2005DIA3J106
Determination of Lead Content in Standard Materials of Lake Sediment and Tea by ID-ICP-MS
采用2种微波消解体系(HNO3-H2O2和HNO3-H2O2-HF)及3种定量模式(同位素稀释法、标准工作曲线法和标准加入法),对沉积物和茶叶标准物质中的铅进行测定,结果表明:同位素稀释质谱法的各项检测指标显著优于其它两种定量模式(茶叶中铅含量测定值为4.30μg/g),标准加入法次之(3.75μg/g),标准工作曲线法较差(3.61μg/g)。二种微波消解体系中,加HF酸优于不加HF酸,不加HF,茶叶中铅的回收率仅有89%,加入HF则上升为98%。Three different quantitative modes,namely external calibration,standard addition and isotope diluˉtion were compared for the determination of lead contents in lake sediment and tea standard materials with two digestion systems.The results showed that the isotope dilution gave the highest accuracy and precision in comˉparison with the other two modes.But the results were affected by the digestion system.For example,the reˉcoveries of lead content for tea were98%and89%for HNO 3 -H 2 O 2 -HF and HNO 3 -H 2 O 2 digesting sysˉtem,respectively.福建省重大科技项目子课题(2003Y005-04);; 厦门大学现代分析科学教育部重点实验室开放课题(B40402
巨噬细胞移动抑制因子诱导血管生成相关基因的表达
【目的】研究巨噬细胞移动抑制因子(MIF)对人血管内皮细胞表达血管生成相关基因的诱导作用。【方法】通过亚克隆,构建原核表达质粒pET22b-MIF,并转化人工程菌B121(DE3)。用Ni-亲合柱分离纯化BL21(DE3)中经IPTG诱导表达的重组MIF。用巨噬细胞移动抑制试验鉴定复性的重组MIF的活性。分别用0、30、60、120ng/mL的重组MIF处理人血管内皮细胞12h,通过Real-time定量PCR检测人血管内皮细胞中VEGF165、FGFR3、MMP9、TGF-α、PDGF-α的mRNA表达。用体外血管生成试验检测重组MIF诱导人血管内皮细胞的成管腔作用。[结果]正确构建了重组质粒pET22b-MIF。经IPTG诱导,在大肠杆菌中以包涵体形式表达出重组MIF。复性的重组MIF对巨噬细胞移动的抑制水平达30%(P<0.05)。重组MIF能特异地诱导HVECs中VEGF165、FGFR3、MMP9、TGF-α、PDGF-α表达,并能特异地诱导人血管内皮细胞形成管腔结构。【结论】在大肠杆菌中成功表达出MIF,MIF能特异地诱导人血管内皮细胞中血管生成相关基因的表达
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