334 research outputs found
Research of the western area county government procuremen — Taking Urumqi County as an example
摘要 随着我国政府采购工作的发展,政府采购规模不断扩大,政府采购政策效应日益突出。然而,政府采购制度在取得一定发展与成效的同时,也遇到了很多问题,在实践中存在许多不和谐因素。尤其是西部地区县级政府采购工作,存在着各种各样的问题,对政府采购制度的有效落实与长期发展产生重大影响。推进西部地区县级政府采购工作,一方面要对政府采购制度进行分析、完善;另一方面要根据各个地区的经济规模、政府采购工作的发展情况,有针对性的进行集中采购机构的独立性设置。 本文分为四个部分,第一部分是绪论,论述了选题的背景与原因,梳理了相关的理论文献,厘定了基础概念,理清研究思路并设计研究方法;第二部分是政府采购工作的理论...Abstract As our government procurement affairs develops, the scale of governmental procures expands and the effects of its policy becomes more and more prominent. However, following the government procurement rules developed, we also encountered a lot of problems. Especially in the west region county, there are various issues in government procurement affairs, which have great effect on the effec...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:X200913613
Analysis and Design of Teaching Quality Management System for Colleges
随着我国社会转型和经济结构调整发展,高校人才培养质量面临着越来越高的要求。传统的教学质量管理手段已不适应高校现行的培养过程。 本项目源于某高校教学质量管理的实际需要,探讨构建一个适用于高校的教学质量管理系统。该系统将有效处理大量教学质量相关信息,及时反映教学过程中存在的问题,有关领导和教学管理人员能及时了解学生出勤、请假、教学评价、问卷调查情况,从而有针对性地开展工作,促进教学质量管理工作的改进和教学质量的不断提高。 该系统基于J2EE平台的Spring+Struts+Hibernate架构,使用JSP技术、Struts框架技术,使用Spring框架技术完成业务逻辑层的业务逻辑,采用Hib...With the social transformation and readjustment of economic structure, the quality requirements of talent training for undergraduates in colleges has become more and more demanding. The traditional measures can’t adapt current training process of the colleges. The project is based on actual requirement of the colleges teaching quality monitoring, and discussed how to structure a teaching qual...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201123082
试析征税人与征税人之间的税收征管矛盾
税收征管矛盾既是推动税收征管改革的根本动力,也是税收征管改革的对象和着眼点。因此,深入研究税收征管矛盾对于深化我国的税收征管改革有着很强的现实意义。矛盾的普遍性与复杂性,决定了我们无法穷尽所有的税收征管矛盾,而抓住一定时期内税收征管中比较有代表性的矛盾形式,并积极寻求解决这些矛盾的方法和途径,用以指导税收征管改革的发展方向,无疑是事半功倍的一个理性选择。就现阶段而言,征税人与征税人之间的非对抗性矛盾,不能不说是我国税收征管领域内的一个不容忽视的矛盾形式。本文将对这一矛盾进行深入的论述
利用外资规模、结构的评估与政策取向的思考
利用外资规模、结构的评估与政策取向的思考●王虹贾建刚改革开放以来,我国吸收利用外资的发展过程大致可分为三个阶段,即1980年~1986年的起步阶段,1987年~1991年的持续发展阶段和1992年至今的高速发展阶段。据统计,截至1996年11月,我国..
智能制造刀具管理系统设计与实现
刀具管理是智能制造生产管理系统的重要组成部分。针对轮式拖拉机柴油发动机箱体、壳体柔性生产线生产的刀具管理需求,分析在线刀具管理流程,实现实时信息驱动的生产管理模式,并以刀具状态信息为核心,集成MES制造执行系统、Kardex刀具柜、条码系统等多个信息系统,开发了刀具的全生命周期管理系统。通过实时采集刀具的物理位置和状态等数据信息,对刀具进行全生命周期状态信息追踪管理,实现刀具在生产制造环节数据高度集成与共享。2016年工信部智能制造综合标准化与新模式应用项目(2016-213
缺氧诱导因子1 alpha在急性心肌缺血中的表达规律
【目的】研究心肌缺血状态下HIF-1α的表达规律及其在死亡之后48h的动态变化。【方法】建立SD大鼠急性心肌缺血模型。随机将大鼠分为正常对照组、假手术组、急性心肌缺血试验组和窒息组。用免疫组化、RT-PCR和Western blot检测心肌缺血及死亡后HIF-1α的表达规律。【结果】术后30min缺血心肌中开始出现HIF-1α mRNA表达上调,4~6h达高峰,至术后48h仍维持此高水平;蛋白质的表达相对滞后,于术后2h开始被检测到,之后表达进行性上升,至12h达高峰后维持在高水平;其它各组HIF-1α检测均为阴性。大鼠术后48h处死,死亡后48h内均可检测到HIF-1α mRNA和蛋白质的表达,但表达呈进行性下降趋势;其他各组均未检测到HIF-1α表达。【结论】HIF-1α可作为一个早期心肌缺血的敏感的辅助诊断指标,并用于急性心肌缺血缺氧性死亡和其他原因(例如窒息)缺氧造成的死亡的鉴别
pBR322-Red Mediated Gene Knockin,Sites and Expression in E.coli Chromosome
应用pBR322-Red介导的重组工程系统,kan/sacB选择反选择系统,双链线性DNA重组技术和重叠引物介导的DNA重组技术,将长度为1 653 bp的luc报告基因分别敲入到E.coliW 3110染色体lacZ,lacY和lacA基因的位置,建立了一系列具有新遗传表型的菌株:CWL2、CWL4和CWL6。荧光素酶分析表明,外源报告基因luc能在这3个结构基因处有效的组成型表达。为了进一步确定外源基因的表达情况,用霍乱毒素B亚单位基因ctxb替换了lacZ基因,构建了新菌株CWD1。证明了以单拷贝形式存在在大肠杆菌染色体CWD1上的ctxb基因能有效的表达CTB蛋白并能将其分泌至细胞外培养液中。结果初步确定了大肠杆菌染色体上的lac操纵子结构基因位点适合外源基因的敲入和表达。Genes lacZ,lacY and lacA in the lac opron of E.coli chromosome were respectively substituted with gene luc by using plasmid pBR322-Red,selection-counterselection system kan/sacB and various strategies of Red homologous recombination including Red mediated linearized double-stranded DNA homologous recombination and Red mediated recombineering with overlapping single stranded DNA oligonucleotides.Then,a series of new strains,CWL2,CWL4 and CWL6,were constructed and we found that they can express protein Luc efficiently.To further study the expression of exogenous genes at the site of lacZ,we have constructed a strain named CWD1 by knockin the cholera toxin B subunit(ctxb) gene at the lacZ site,then we found that CWD1 can express protein CTB efficiently and CTB was secreted out of the cell.So we assured that the sites of structure genes in the lac operon of Escherichia coli chromosome were suitable for expressing foreign genes.军队“十五”医药卫生科学基金资助(编号:01MA089)~
舌鳞癌微血管密度与预后的关系
【目的】研究舌鳞状细胞癌(简称舌鳞癌, 下同)组织中新生微血管的密度(MVD)与舌鳞癌患者预后的关系。【方
法】用免疫组织化学S-P 法对75 例舌鳞癌标本进行染色, 依据Weidner 法进行肿瘤微血管密度计数, 并与舌鳞癌的病理分级、
颈淋巴结转移与否及患者生存期作比较。【结果】不同分化程度舌鳞癌组织中新生血管密度不同(P <0.01), 低分化者
M VD 高于高分化者;G1 , G2 , G3 期MVD 分别为24±10, 31 ±11 和48 ±12 ;颈淋巴结转移组MVD 为36 ±11 , 无颈淋巴结转移
组MVD 为27±9(t =2.383, P <0.01);五年生存组MVD 为26 ±9, 五年内死亡组MVD 为34±10(t =2.042, P <0.01)。
【结论】肿瘤微血管密度与舌鳞癌生物学行为相关, 可以作为舌鳞癌患者预后的指标
闽江口水、间隙水和沉积物中有机氯农药的含量
[摘要]:利用GC2ECD 和GC2MSD 对1999 年11 月闽江口水、间隙水和沉积物中的有机氯农药进行了研究. 结果显
示,闽江口水中有机氯农药的含量范围是01532~1182μg/ L ,间隙水中有机氯农药的含量为4154~1317μg/ L ,沉
积物(干重,以下讨论到的沉积物,无特别说明都是干重表示) :28179~52107μg/ kg ;与其他河口如珠江口、九龙江
口相比,闽江口的污染水平居中. 间隙水的污染物浓度普遍高于其上覆水的浓度,而沉积物中的浓度大于间隙水、
表层水,是由于有机污染物在水体中倾向于吸附在沉积物颗粒,并且通过再悬浮从底层向上迁移. 对水体中有机
氯农药各组分的含量及特征进行了分析,发现有机氯农药的主成分为:β2HCH ,DDE ,Heptachlor (七氯) ,Endosulfan
Ⅱ(硫丹) ,Methoxychlor (甲氧滴涕) . DDE、β2HCH、Endosulfan Ⅱ分别占DDTs、HCHs 和硫丹的主要部分;有机氯
农药各组分间有正相关性,表明其河口有机氯农药陆源的土壤输入与相似的环境行为;对该河口的污染水平进行
了初步的评价,HCHs 符合国家海水水质一级标准,DDTs 则超过该标准.[Abstract]:The concentrations of 18 organochlorine pesticedes in water , pore water and surface sediment from Minjiang
River Estuary were analyzed by GC2ECD , and confirmed by GC2MSD. The range of organochlorine pesticides was
01532~1182μg/ L at water , 4154~1317μg/ L at pore water , and 28179~52107μg/ kg at sediment . Compared with
the results of other estuaries and gulfs (Pearl River Estuary , Jiulong River Estuary and so on) , it showed that the pollu2
tion of organochlorines in Minjiang was some moderate. The concentration difference in surface water , middle water ,
bottom water , pore water and sediment , due to the higher affinity of these hydrophobic compound for sedimentary phase
than to water and a potential flux of pollutants from sediment to overlying water. The predominance ofβ2HCH ,DDE ,
Heptachlor , Endosulfan Ⅱand Methoxychlor in all water , pore water and sediment were clearly observed. On average ,
DDE、β2HCH、Endosulfan Ⅱoccupied the most part of total DDTs , HCHs and Endosulfans respectively , indicated the
fate of these parent compounds or congeners. At the same time , it was found that thepositive relationship among the in2
dividual organochlorine components (HCHs , DDTs and Endosulfans) , which indicated that the similar of the source and
behavior for organochlorine pesticides.海洋环境科学教育部重点实验室开放基金与教育
部重点基金联合资
Contents of Organochlorine Pesticides in Water , Pore Water and Sediment in Minjiang River Estuary of China
[摘要]:利用GC2ECD 和GC2MSD 对1999 年11 月闽江口水、间隙水和沉积物中的有机氯农药进行了研究. 结果显
示,闽江口水中有机氯农药的含量范围是01532~1182μg/ L ,间隙水中有机氯农药的含量为4154~1317μg/ L ,沉
积物(干重,以下讨论到的沉积物,无特别说明都是干重表示) :28179~52107μg/ kg ;与其他河口如珠江口、九龙江
口相比,闽江口的污染水平居中. 间隙水的污染物浓度普遍高于其上覆水的浓度,而沉积物中的浓度大于间隙水、
表层水,是由于有机污染物在水体中倾向于吸附在沉积物颗粒,并且通过再悬浮从底层向上迁移. 对水体中有机
氯农药各组分的含量及特征进行了分析,发现有机氯农药的主成分为:β2HCH ,DDE ,Heptachlor (七氯) ,Endosulfan
Ⅱ(硫丹) ,Methoxychlor (甲氧滴涕) . DDE、β2HCH、Endosulfan Ⅱ分别占DDTs、HCHs 和硫丹的主要部分;有机氯
农药各组分间有正相关性,表明其河口有机氯农药陆源的土壤输入与相似的环境行为;对该河口的污染水平进行
了初步的评价,HCHs 符合国家海水水质一级标准,DDTs 则超过该标准.[Abstract]:The concentrations of 18 organochlorine pesticedes in water , pore water and surface sediment from Minjiang
River Estuary were analyzed by GC2ECD , and confirmed by GC2MSD. The range of organochlorine pesticides was
01532~1182μg/ L at water , 4154~1317μg/ L at pore water , and 28179~52107μg/ kg at sediment . Compared with
the results of other estuaries and gulfs (Pearl River Estuary , Jiulong River Estuary and so on) , it showed that the pollu2
tion of organochlorines in Minjiang was some moderate. The concentration difference in surface water , middle water ,
bottom water , pore water and sediment , due to the higher affinity of these hydrophobic compound for sedimentary phase
than to water and a potential flux of pollutants from sediment to overlying water. The predominance ofβ2HCH ,DDE ,
Heptachlor , Endosulfan Ⅱand Methoxychlor in all water , pore water and sediment were clearly observed. On average ,
DDE、β2HCH、Endosulfan Ⅱoccupied the most part of total DDTs , HCHs and Endosulfans respectively , indicated the
fate of these parent compounds or congeners. At the same time , it was found that thepositive relationship among the in2
dividual organochlorine components (HCHs , DDTs and Endosulfans) , which indicated that the similar of the source and
behavior for organochlorine pesticides.海洋环境科学教育部重点实验室开放基金与教育
部重点基金联合资
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