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Search Results: 1 - 10 of 58378 matches for " 左燕霞 "
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干旱山区雨水资源利用研究综述
Survey on the Utilization of Rainwater Resources in Arid Mountainous Areas
 [PDF]

, 张乃瑾, 张建峰
Journal of Water Resources Research (JWRR) , 2016, DOI: 10.12677/JWRR.2016.51008
Abstract:
本文对干旱山区雨水资源在国内外的发展和利用情况进行了综合论述,并对就地拦蓄入渗、覆盖抑制蒸发和雨水富集叠加三种雨水资源利用技术的应用特点和优缺点进行了介绍,尤其对就地拦蓄入渗利用技术包括的水保工程技术和水保耕作技术,土壤覆盖抑制蒸发技术包括的黑色、白色、绿色、化学、砾石和土壤覆盖技术和雨水富集叠加利用技术包括的集流技术、贮水技术和高效利用技术的节水方式、技术特点和使用条件进行了详细的分析,同时,介绍了一些应用成功的案例。另外,从雨水集蓄利用与水土保持的关系,以及雨水积蓄利用技术对整个区域环境的影响进行了分析,雨水集蓄利用在水土保持中具有积极的作用和意义,尤其在干旱半干旱地区,要采取合理的雨水资源利用技术来有效的防止雨水资源的过度利用对环境的负面影响。
The development and utilization of rainwater resources in arid area at home and abroad are discussed in this paper, and the using the technology of infiltration into local storage, soil cover evaporation technique, rainwater accumulation, utilization technology of three kinds of rainwater resource utilization technology of application characteristics, and advantages and disadvantages are introduced, especially for using the technology of infiltration into local storage including the technology of water and soil conservation engineering and the water and soil conservation tillage technology, soil cover evaporation technique including black, white, green, chemical, gravel and soil covering technology and rainwater accumulation and utilization technology including harvesting techniques, water storage technology and high efficient utilization technology about the water saving mode, technical characteristics and conditions of use are analyzed in detail, at the same time, the paper introduces some cases successfully applied. In addition, the paper has carried on the analysis from relation between rainwater harvesting and utilization and water and soil conservation, the influence of rainwater accumulation and utilization technology on the whole regional environment is analyzed, rainwater harvesting and utilization in soil and water conservation has a positive role and significance, especially in arid and semi-arid areas, reasonable utilization of rainwater resources should be taken to effectively prevent the negative effects of excessive utilization of rainwater resources on the environment.
O3/UV降解喹啉过程中的毒性变化
王小毛,,,胡洪营
环境化学 , 2015,
Abstract: 利用发光细菌新鲜菌悬液进行毒性测试,研究了O3/UV降解喹啉过程中的毒性变化.研究表明,在选取的浓度范围内,无论是HgCl2/sub>还是喹啉,发光细菌发光抑制率(或相对发光量)与物质浓度的对数均呈线性关系.采用处于对数生长期初期的发光细菌进行毒性测试时的灵敏度和最低检测限都很理想,适合于毒性测试.O3/UV降解喹啉时,体系毒性出现先迅速上升并保持一段时间随后缓慢下降然后又缓慢上升的现象.O3/UV降解喹啉过程中产生了毒性更强的中间产物,这些产物是导致体系毒性上升的主要因素.
Fenton氧化/混凝协同处理焦化废水生物出水的研究
,何苗,张彭义,,赵文涛
环境科学 , 2006,
Abstract: 对Fenton氧化/混凝协同处理焦化废水生物出水的方法进行了研究,在综合考虑经济性和去除效果的前提下,提出了反应的最佳条件:H2O2投加量为220mg/L,Fe2+投加量为180mg/L,聚丙烯酰胺投加量为4.5mg/L,反应时间为0.5h,pH=7。最终COD去除率可达44.5%,色度可以降为35倍,出水符合国家污水排放二级标准。同时,通过分析分子量分布和小分子有机物组成,揭示了Fenton氧化/混凝协同处理焦化废水生物出水的污染物变化规律。结果表明焦化废水经过Fenton氧化/混凝协同处理后,其出水可达到国家二级排放标准,并且处理成本相对较低,具有实际应用的前景。
沸石床多级生物膜焦化废水处理系统的NH+4-N去除稳定性研究
赵文涛,,何苗,张彭义,
环境科学 , 2009,
Abstract: 焦化废水处理中预处理蒸氨工艺不稳定容易引起生物处理出水NH+4-N的波动,为了在有机物去除的同时提高生物系统对NH+4-N的去除效果和稳定性,采用对NH+4-N有良好吸附性能的天然斜发沸石为生物填料构建沸石床多级生物膜系统,考察了进水负荷对系统运行稳定性的影响、抗冲击负荷能力以及系统的功能分区和污染物迁移转化规律.结果表明,当系统进水NH+4-N负荷≤0.21kg/(m3·d)、COD负荷≤1.35 kg/(m3·d)时,出水NH+4-N和COD的平均浓度分别为(2.2±1.2)mg/L和(228±60)mg/L,平均去除率分别达(99.1±0.5)%和(86.0±2.6)%.在低、高两次NH+4-N冲击负荷[0.03 kg/(m3·d)和0.06 kg/(m3·d)]条件下,系统对NH+4-N的平均去除率仍然分别高达99.0%和92.9%,高于对比系统的96.8%和89.3%,表现出良好的抗NH+4-N冲击负荷性能与处理稳定性.系统好氧单元反应器沿程出现脱碳/硝化功能区(C/N区)和硝化功能区(N区),其中N区的NH+4-N降解速率为C/N区的2~8倍.系统进水中相对分子质量<1×103、1×103~1×104、>1×104的TOC浓度分别为227.6、104.8和35.0mg/L,处理出水中的TOC浓度分别为31.2、22.9和31.5mg/L,其中相对分子质量<1×103和1×103~1×104这2个范围的有机物降解良好,出水残余物质主要为相对分子质量>1×103的有机物.
发达国家微网政策及其对中国的借鉴意义
程军照,李澍森,冯宇,陈晓,凡勇,,石延辉
电力系统自动化 , 2010,
Abstract: 根据国家的能源政策,分布式发电和微网将在中国得到迅猛发展,而有效的政策是确保其有序发展的前提。在广泛搜集并研究国内外相关资料的基础上,文中对发达国家的分布式发电和微网政策进行了概括总结,包括微网政策的国外研究现状、微网的准入、微网并网标准、微网并网收费、微网电量的上网政策。在参考发达国家政策并结合中国具体国情的基础上提出中国发展微网的政策建议。
国内外膨胀尾管悬挂器技术现状简述
Technology Status of Expandable Liner Hanger in Domestic and Abroad
 [PDF]

李晓军, 穆总结, , 黄永军
Mechanical Engineering and Technology (MET) , 2012, DOI: 10.12677/MET.2012.14013
Abstract: 与常规尾管悬挂器相比,可膨胀尾管悬挂器具有诸多优势。可膨胀尾管悬挂器是一种连接在尾管上,通过地面操作进行液压或机械作用,使得膨胀管沿径向膨胀的一种尾管悬挂器。通过膨胀管本体的膨胀,膨胀管本体与外层套管进行贴合,在摩擦力的作用下,进行尾管的悬挂,并进行有效密封;同时,保证了良好的井眼尺寸,为后续井下操作提供技术保证。由于其具密封能力强、悬挂能力优、可旋转固井、尾管入井过程中可开泵循环等优点,能解决超深井、大位移井以及水平井的尾管下入和水泥顶替效率低等技术难题,因而具有广阔的应用前景。本文将对国内外膨胀尾管悬挂器技术现状进行简述,并对西部钻探钻井工程技术研究院进行自行研制的膨胀尾管悬挂器的结构及工作原理及相关配套技术进行论述。
Expandable liner hangers (ELH) have been shown to provide multiple advantages over conventional liner hangers. The expandable liner hanger (ELH) will be expanded by the hydraulic action or mechanical action. The ex-panded body of the ELH can hang the liner reliably. At the same time, the ELH can provide some advantages, such as good seal and hang liner abilities, rotating cementing, etc. The ELH can also resolve some technical difficulties which occur when tripping in liners and cement displacements in ultra-deep wells, extended reach wells and horizontal wells. So, the expandable liner hanger has a broad prospect in applications. The paper aims to introduce the characteristics, operating principles and matching technologies of the Expandable Liner Hanger which is developed by Drilling Tech-nology Research Institute of Xibu Drilling Engineering Company, CNPC.
聚合酞菁钴/碳纳米管复合材料的制备及氧还原催化性能研究 Preparation and Electrocatalytic Performances of Carbon Nanotubes Supported Poly-Cobalt-Phthalocyanine  [PDF]
杨士锋,张瑞,崔鲁芳,
Material Sciences (MS) , 2013, DOI: 10.12677/ms.2013.32010
Abstract: 采用原位合成方法制备了聚合酞菁钴/多壁碳纳米管(Poly-CoPc/MWCNT)复合材料。运用紫外–可见吸收光谱(UV-Vis)和透射电镜方法(TEM)对复合材料的结构进行了表征,结果显示生成的聚合酞菁钴通过π-π作用包裹在碳纳米管的表面并且聚合酞菁钴的厚度及均匀度随着反应时间和反应温度的改变而发生了变化;采用循环伏安(CV)电化学方法研究了反应时间和反应温度与复合材料的氧还原催化性能之间的关系,研究发现,反应时间和反应温度对复合材料的氧还原催化性能产生了很大的影响。 We prepared Cobalt-phthalocyanine polymers/MWCNT (Poly-CoPc/MWCNT) with in-situ synthesis method. The products were characterized by UV-Vis and TEM, the results showed that Poly-CoPc has been adsorbed onto the surface of MWCNT through π-π interactions and with the change of the reaction time and reaction temperature, the thickness and uniformity of Poly-CoPc are changed. The correlation between the electrocatalytic activity of the modified electrodes of obtained Poly-CoPc/MWCNT and reaction time and reaction temperature were measured by cyclic voltammetry (CV). The results showed that reaction time and reaction temperature have great influences on its oxygen reduction performances.
农村居民大病保险经济补偿能力及效果
Research on Economic Compensation Ability and Compensation Effect of Critical Illness Insurance of Rural Residents

詹长春,
- , 2016,
Abstract: 经济补偿是农村居民大病保险的基本职责,经济补偿能力是履行该职责的前提和基础,经济补偿效果是履行该职责的具体体现。利用江苏省5个样本地区的实地调研数据,从横向和纵向两个维度评估了各地大病保险的经济补偿能力,从大病保险的受益面、患者个人自付比例、大病保险基金使用率等指标综合衡量各地大病保险的经济补偿效果。研究发现,医疗费用、筹资机制、政策设计等多种主客观因素共同约束着大病保险经济补偿能力和补偿效果的发挥,亟需从补偿主体的衔接、大病费用的控制、筹资机制的建设、大病保险的服务等方面进行改进。
Economic compensation is the basic duty of critical illness insurance of rural residents, and economic compensation ability is the premise and basis to perform the duty, while economic compensation effect is a concrete manifestation of the duty. Based on the research data of five sample areas in Jiangsu Province, this paper assesses the economic compensation ability of critical illness insurance from both horizontal and vertical dimensions systematically, and uses benefit rate, OOP, rates of critical illness insurance fund utilization to measure the economic compensation effect synthetically. The results show that a variety of subjective and objective factors of medical cost, financing mechanisms, and policy design factors, which together constrain the economic compensation ability and compensation effect of critical illness insurance. Finally, the paper puts forward some suggestions to improve the situation, including adjusting the cohesion of compensation body, controlling the cost of critical illness, constructing the financing mechanisms, and optimizing critical illness insurance service.
学校口腔卫生健康教育模式探讨
师茂林,
中国公共卫生 , 2002, DOI: 10.11847/zgggws2002-18-04-74
Abstract: ?口腔卫生健康教育可以提高人们对口腔保健知识的认知水平.但它能否改变人们的观念,并且进一步影响到他们的行为和口腔卫生状况值得探讨[1].为了在这一问题上探索出一条适合学校口腔卫生健康教育的新路,自1999年3月起,我们在石河子市区的各小学以“知-信-行”为主线,采取“复合式”的口腔健康教育干预模式.
NH+4-N Removal Stability of Zeolite Media Packed Multistage-Biofilm System for Coke-Plant Wastewater Treatment
沸石床多级生物膜焦化废水处理系统的NH+4-N去除稳定性研究

ZHAO Wen-tao,HUANG Xi,HE Miao,ZHANG Peng-yi,ZUO Chen-yan,
赵文涛
,,何苗,张彭义,

环境科学 , 2009,
Abstract: 焦化废水处理中预处理蒸氨工艺不稳定容易引起生物处理出水NH+4-N的波动,为了在有机物去除的同时提高生物系统对NH+4-N的去除效果和稳定性,采用对NH+4-N有良好吸附性能的天然斜发沸石为生物填料构建沸石床多级生物膜系统,考察了进水负荷对系统运行稳定性的影响、抗冲击负荷能力以及系统的功能分区和污染物迁移转化规律.结果表明,当系统进水NH+4-N负荷≤0.21 kg/(m3·d)、COD负荷≤1.35 kg/(m3·d)时,出水NH+4-N和COD的平均浓度分别为(2.2±1.2)mg/L和(228±60)mg/L,平均去除率分别达(99.1±0.5)%和(86.0±2.6)%.在低、高两次NH+4-N冲击负荷[0.03 kg/(m3·d)和0.06 kg/(m3·d)]条件下,系统对NH+4-N的平均去除率仍然分别高达99.0%和92.9%,高于对比系统的96.8%和89.3%,表现出良好的抗NH+4-N冲击负荷性能与处理稳定性.系统好氧单元反应器沿程出现脱碳/硝化功能区(C/N区)和硝化功能区(N区),其中N区的NH+4-N 降解速率为C/N区的2~8倍.系统进水中相对分子质量<1×103、 1×103~1×104、 >1×104的TOC浓度分别为227.6、104.8和35.0 mg/L,处理出水中的TOC浓度分别为31.2、 22.9和31.5 mg/L,其中相对分子质量<1×103和1×103~1×104这2个范围的有机物降解良好,出水残余物质主要为相对分子质量>1×103的有机物.
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