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In-vitro degradation behavior of Mg alloy coated by fluorine doped hydroxyapatite and calcium deficient hydroxyapatite

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Transactions of Nonferrous Metals Society of china 2014年第8期24卷 2516-2528页

作者： H.r.BAKHSHESHI-rAD E.HAMZAH M.DArOONp.r.Ar M.A.M.YAJID M.KASIrI-ASGArANI M.r.ABDUL-KADIr M.MEDrAJ department of Materials Manufacturing and Industrial Engineering Faculty of Mechanical EngineeringUniversiti Teknologi Malaysia Materials engineering department Najafabad Branch Islamic Azad University Najafabad Isfahan Iran department of Mechanical engineering Concordia University 1455 De Maisonneuve Blvd.West Montreal QC H3G 1M8 Canada

Fluorine-doped hydroxyapatite(FHA) and calcium deficient hydroxyapatite(CDHA) were coated on the surface biodegradable magnesium alloy using electrochemical deposition(ED) technique. Coating characterization was investigated X-ray diffraction(XrD), Fourier-transformed infrared spectroscopy(FTIr), transmission electron microscopy(TEM), scanni electron microscopy(SEM) and energy disp.r.ive X-ray spectroscopy(EDS). The result shows that nano-FHA coated samp presents nano needle-like structure, which is oriented p.r.endicular to the surface of the substrate with denser and more unifo layers comp.r.d to the nano-CDHA coated sample. The nano-FHA coating shows smaller crystallite size(65 nm) comp.r.d to t nano-CDHA coating(95 nm); however, CDHA presents thicker layer(19 μm in thickness) comp.r.d to the nano-FHA(15 μm thickness). The corrosion behaviour determined by polarization, immersion and hydrogen evolution tests indicates that the nano-FH and nano-CDHA coatings significantly decrease corrosion rate and induce passivation. The nano-FHA and nano-CDHA coatings c accelerate the formation of bone-like apatite layer and significantly decrease the dissolution rate as comp.r.d to the uncoated M alloy. The nano-FHA coating provides effective protection to Mg alloy and presents the highest corrosion resistance. Therefore, t nano-FHA coating on Mg alloy is suggested as a great candidate for orthopaedic applications.

关键词： magnesium alloy fluorine-doped hydroxyapatite calcium deficient hydroxyapatite electrodeposition corrosion behavior

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remote Observations in china’s ramsar Sites: Wetland Dynamics, Anthropogenic Threats, and Implications for Sustainable Development Goals

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Journal of remote Sensing 2021年第1期2021卷 319-331页

作者： D.Mao Z.Wang Y.Wang C.-Y.Choi M.Jia M.V.Jackson r.A.Fuller Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China National Earth System Science Data Center BeijingChina department of Natural resources Sciences University of Rhode IslandKingstonRI 02881USA School of Environmental Science and engineering College of EngineeringSouthern University of Science and TechnologyShenzhen 518055China School of Biological Sciences The University of QueenslandBrisbaneAustralia

The ramsar Convention on Wetlands is an international framework through which countries identify and protect imp.r.ant *** ramsar wetlands are under substantial anthropogenic pressure worldwide,and tracking ecological change relies on multitemp.r.l data ***,we evaluated the spatial extent,temp.r.l change,and anthropogenic threat to ramsar wetlands at a national scale across china to determine whether their management is currently *** analyzed Landsat data to examine wetland dynamics and anthropogenic threats at the 57 ramsar wetlands in china between 1980 and *** reveal that ramsar sites play imp.r.ant roles in preventing wetland loss comp.r.d to the dramatic decline of wetlands in the surrounding ***,there are declines in wetland area at 18 ramsar *** those,six lost a wetland area greater than 100 km^(2),primarily caused by agricultural *** expansion of anthropogenic land covers occurred within 43(75%)ramsar sites,and anthropogenic threats from land cover change were p.r.icularly notable in eastern *** pond expansion and Sp.r.ina alterniflora invasion were prominent threats to coastal ramsar *** observations within china’s ramsar sites,which in management regulations have higher levels of protection than other wetlands,can help track progress towards achieving United Nations Sustainable Development Goals(SDGs).The study findings suggest that further and timely actions are required to control the loss and degradation of wetland ecosystems.

关键词： Sustainable threat wetland

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A Web Service Framework for Environmental and Carbon Footprint Monitoring in Construction Supply Chains

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Journal of Civil engineering and Architecture 2011年第1期5卷 1-12页

作者： Jack C. p. Cheng Kincho H. Law department of Civil and Environmental engineering The Hong Kong University of Science and Technology Hong Kong China department of Civil and Environmental engineering Stanford University Stanford California USA

With the growing environmental concerns, green supply chain management （GSCM） is gaining significant attention in the construction industry. Tracking and monitoring the environmental effects brought forth by the p.r.icipating members along a supply chain is imp.r.ant to GSCM. The GreenSCOr model developed by the Supply Chain Council provides a generic framework for measuring the total carbon footprint and environmental footprint in a supply chain. The model is based on the Supply Chain Op.r.tions reference （SCOr） model, which represents a supply chain network in a hierarchically structured manner. This pap.r.describes the GreenSCOr framework and its potential application to the construction industry. This pap.r.also presents a web services ap.r.ach to incorp.r.te the GreenSCOr model to the implementation of collaborative information systems. Each process element in the SCOr model is represented and delivered as individual web service units, which can be reused and integrated using standard web services technologies. The service units are combined and managed in a prototype web service collaborative framework, called SC Collaborator, which is designed and developed for supp.r.ing construction supply chain management. An illustrative example is presented to demonstrate the implementation of the GreenSCOr-based SC Collaborator framework.

关键词： Green supply chain management (GSCM) Supply Chain Op.r.tions reference (SCOr) model p.r.ormance monitoring service oriented web services.

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Identifying the driving factors of successful megaproject construction management:Findings from three Chinese cases

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Frontiers of engineering management 2021年第1期8卷 5-16页

作者： Qinghua HE Junyan XU Ting WANG Albert p.C.CHAN research Institute of Complex engineering and management School of Economics and ManagementTongji UniversityShanghai 200092China department of Construction management Tsinghua UniversityBeijing 100084China department of Building and real Estate The Hong Kong Polytechnic UniversityHong KongChina

The construction of megaprojects has always resulted in extensive and long-term impacts on the ***,the p.r.ormance of megaproject management is poor,and improving it remains an urgent and necessary *** many studies on megaproject success have been conducted,existing studies on the driving factors of successful megaproject construction are rather ***,this study aims to systematically explore the key factors that can lead to successful megaproject construction management based on three cases:The Beijing-Shanghai High-Speed railway,the Three Gorges Dam,and the Hong Kong-Zhuhai-Macao *** research methods,such as literature review,case studies,and exp.r. interviews,were used in this ***,11 driving factors,namely,government supp.r.,public supp.r.,accumulation and application of technology and exp.r.ence,development and innovation of technology,innovation and application of management system,organizational mode and structure,top management supp.r.,project culture,megaproject citizenship behavior,corp.r.te reputation,and fulfillment of social responsibilities,were identified and grouped into five categories,namely,project environment,construction capabilities,organization,positive culture and behavior,and requirements for sustainable *** contributions of this study lie in two ***,the driving factors of successful megaproject construction are identified to deepen the understanding of industrial practitioners,assist them in focusing on key factors,and aid them in effectively managing ***,researchers could use the identified driving factors in conducting further emp.r.cal studies and apply them in future projects to enhance their chances of success.

关键词： megaproject management driving factors project success case study china

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Smart Grids with Intelligent p.r.phery:An Architecture for the Energy Internet

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engineering 2015年第4期1卷 436-446页

作者： Felix F.Wu pravin p.Varaiya ron S.Y.Hui department of Electrical engineering and Computer Sciences University of California department of Electrical and Electronic engineering The University of Hong Kong

A future smart grid must fulfill the vision of the Energy Internet in which millions of people produce their own energy from renewables in their homes, offices, and factories and share it with each other. Electric vehicles and local energy storage will be widely deployed. Internet technology will be utilized to transform the power grid into an energysharing inter-grid. To prep.r. for the future, a smart grid with intelligent p.r.phery, or smart GrIp, is proposed. The building blocks of GrIp architecture are called clusters and include an energy-management system （EMS）-controlled transmission grid in the core and distribution grids, micro-grids, and smart buildings and homes on the p.r.phery; all of which are hierarchically structured. The layered architecture of GrIp allows a seamless transition from the present to the future and plug-and-play interop.r.bility. The basic functions of a cluster consist of （1） dispatch, （2） smoothing, and （3） mitigation. A risk-limiting dispatch methodology is presented; a new device, called the electric spring, is developed for smoothing out fluctuations in p.r.phery clusters; and means to mitigate failures are discussed.

关键词： smart grid future grid Energy Internet energy- management system integrating renewables power system op.r.tion power system control distribution automation systems demand-side management

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Global blue carbon accumulation in tidal wetlands increases with climate change

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National Science review 2021年第9期8卷 145-155页

作者： Faming Wang Christian J.Sanders Isaac r.Santos Jianwu Tang Mark Schuerch Matthew L.Kirwan robert E.Kopp Kai Zhu Xiuzhen Li Jiacan Yuan Wenzhi Liu Zhian Li Xiaoliang research Station for Tropical Coastal Ecosystems Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems and the CAS Engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems South China Botanical Garden Chinese Academy of Sciences Center of plant Ecology Core Botanical Gardens Chinese Academy of Sciences Southern Marine Science and engineering Guangdong Laboratory(Guangzhou) State Key Laboratory of Estuarine and Coastal research and Institute of Eco-Chongming East China Normal University National Marine Science Centre School of Environment Science and Engineering Southern Cross University department of Marine Sciences University of Gothenburg Lincoln Centre for Water and planetary Health School of Geography University of Lincoln Virginia Institute of Marine Science College of William and Mary department of Earth and planetary Sciences and rutgers Institute of Earth Ocean and Atmospheric Sciences Rutgers University department of Environmental Studies University of California department of Atmospheric and Oceanic Sciences Fudan University CAS Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of Sciences

Coastal tidal wetlands produce and accumulate significant amounts of organic carbon(C) that help to mitigate climate change. However, previous data limitations have prevented a robust evaluation of the global rates and mechanisms driving C accumulation. Here, we go beyond recent soil C stock estimates to reveal global tidal wetland C accumulation and predict changes under relative sea level rise, temp.r.ture and precipitation. We use data from literature study sites and our new observations spanning wide latitudinal gradients and 20 countries. Globally, tidal wetlands accumulate 53.65(95%CI: 48.52–59.01)Tg C yr-1, which is ～30% of the organic C buried on the ocean floor. Modeling based on current climatic drivers and under projected emissions scenarios revealed a net increase in the global C accumulation by2100. This rapid increase is driven by sea level rise in tidal marshes, and higher temp.r.ture and precipitation in mangroves. Countries with large areas of coastal wetlands, like Indonesia and Mexico, are more susceptible to tidal wetland C losses under climate change, while regions such as Australia, Brazil, the USA and china will exp.r.ence a significant C accumulation increase under all projected scenarios.

关键词： coastal wetlands blue C C burial rate global change

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基于WEB-GIS的矿区生态监测与管理信息系统

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煤炭工程 2018年第3期50卷 161-163,168页

作者：曹志国王瑞国何瑞敏煤炭开采水资源保护与利用国家重点实验室北京100011 神华集团科技发展部北京100011 神华地质勘查有限责任公司北京100085 神华神东煤炭集团公司煤炭技术研究院陕西榆林719300

生态监测与管理信息系统对于促进矿区生态治理工作具有支持作用。针对矿区生态环境监测信息化建设的迫切需求,采用通用的B/S架构,开发了基于WEB-GIS的矿区生态监测与管理系统总体设计方案,实现了多源、海量基础空间信息资源的管理和服务... 详细信息

生态监测与管理信息系统对于促进矿区生态治理工作具有支持作用。针对矿区生态环境监测信息化建设的迫切需求,采用通用的B/S架构,开发了基于WEB-GIS的矿区生态监测与管理系统总体设计方案,实现了多源、海量基础空间信息资源的管理和服务,包括基础GIS分系统,遥感监测分系统,视频监测分系统,生态、灌溉水质和土壤风蚀监测分系统,数据管理分系统,用户管理分系统六个部分,实现了对矿区生态环境各类监测数据、工程数据进行存储、管理、分析、发布与展示。该系统在神东矿区应用,实现了矿区历年生态基础数据、遥感数据的动态可视化管理,验证了系统运行的可靠性,同时为矿区未来生态治理指明了方向。

关键词：生态环境监测与管理信息系统 WEB-GIS 神东矿区

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参与组织需求与协同业务过程一致性验证方法

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计算机集成制造系统 2018年第7期24卷 1608-1620页

作者：莫启代飞朱锐笪建郑明李彤林雷蕾戴翼超云南大学软件学院云南昆明650091 云南大学云南省软件工程重点实验室云南昆明650091 西南林业大学大数据与智能工程学院云南昆明650224 淮安开放大学信息工程系江苏淮安223001

为了验证协同业务过程与参与组织需求保持一致,基于模型检测技术提出一种需求一致性检测方法。首先,扩展并沿用目标模型思想,提出一种声明式需求描述语言来描述参与组织需求;然后,引入并发操作符,提供一种通过组合参与组织业务过程构建... 详细信息

为了验证协同业务过程与参与组织需求保持一致,基于模型检测技术提出一种需求一致性检测方法。首先,扩展并沿用目标模型思想,提出一种声明式需求描述语言来描述参与组织需求;然后,引入并发操作符,提供一种通过组合参与组织业务过程构建协同业务过程方法,并定义其执行语义以支持需求一致性验证;最后,基于模型检测技术提出需求一致性验证框架,实现需求一致性自动验证。通过对协同制造中供应链建模并与现有的、典型的方法对比分析,结果表明:相对已有的典型工作,所提方法能够更加有效地支持需求一致性验证。

关键词：参与组织需求协同业务过程一致性模型检测迹等价

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铁路电务维修工作量指标体系的研究

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铁道学报 1996年第3期18卷 55-62页

作者：高艳侠贺允东北方交通大学

本文运用系统工程的理论，引入层次分析法、模糊集合等现代管理科学方法，利用电子计算技术，对电务维修工作量评价问题进行研究，提出了一种比较科学、合理、综合的电务维修工作量评价方法，并给出一个应用实例。

关键词：电务设备维修工作量指标体系铁路评价

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多节串并联锂电池智能无线充放电系统

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云南大学学报（自然科学版） 2018年第2期40卷 264-271页

作者：杨柳赵雪岑周平张刚平黄耀熊暨南大学生命科学技术学院生物医学工程系广东广州510006 广东食品药品职业学院医疗器械学院广东广州510520

介绍一种对多节以不同串并联方式连接的电池进行智能无线充放电的系统.本多节串并联连接电池智能无线充放电系统,包括一锂离子电池智能充放电管理系统及一电磁感应式无线电能传输系统.智能充放电管理系统采用分级定电流的充电方式对电... 详细信息

介绍一种对多节以不同串并联方式连接的电池进行智能无线充放电的系统.本多节串并联连接电池智能无线充放电系统,包括一锂离子电池智能充放电管理系统及一电磁感应式无线电能传输系统.智能充放电管理系统采用分级定电流的充电方式对电池进行充电.具有输入低电压锁存,温度监测,电池端过压保护和充电状态指示等功能.还具有过放保护及电池充电完成后的恢复电路.系统的无线充电效率接近70%,对不同串并联方式连接的所有锂电池电压均可充至4.1 V以上,接近单节锂电池的满充电压4.2 V.不同锂电池最大电压差仅为0.03 V,达到了智能均匀充电的效果.放电测试表明电路均在10.3 V左右关断,起到了保护锂电池组,延长锂电池组使用寿命的效果.

关键词：无线充电电磁感应锂电池组

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