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Characteristics and Influencing Factors of Microplastics in Snow in the Inner Mongolia Plateau, China

Engineering 2024年第6期37卷 69-77页

作者： Hongwei Yu Junrong Shao Huawei Jia Diga Gang Baiwen Ma Chengzhi Hu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Changjiang Survey PlanningDesign and Research Co.Ltd.Wuhan 430010China

Microplastics(MPs;<5 mm)have become one of the most prominent global environmental pollution *** can spread to high altitudes through atmospheric transport and can be deposited by rainfall or snowfall,potentially thre... 详细信息

Microplastics(MPs;function of natural *** in terrestrial and aquatic ecosystems alter the growth and functional characteristics of ***,little attention has been given to the possible harm associated with MPs deposited in snow,particularly in the context of global climate *** collected from surface snow in the Inner Mongolia Plateau,China,were used for quantitative analysis and *** results showed that MPs were easily detected,and the related concentration was approximately(68±10)–(199±22)MPsL1 in snow *** were the most common morphology,the polymer composition was largely varied,and the abundance and composition of MPs were linked to human activity to a great ***-throughput sequencing results showed that the composition and abundance of microorganisms also differed in snow samples from areas with different MP pollution characteristics,indicating a considerable difference in microbial functional *** may have an interference effect on the individual growth and functional expression of microorganisms in *** addition,the results showed that functional living areas(e.g.,landfills and suburban areas)in cities play an important role in the properties of *** instance,the highest abundance of MPs was found in thermal power plants,whereas the abundance of polymers per sample was significantly lower in the suburban *** MP contaminants hidden in snow can alter microbial structure and function and are therefore a potential threat to ecosystem health.

关键词： Human activities Snow Microplastics Microbial community urban function Environmental effect

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The fractal or scaling perspective on progressively generated intra-urban clusters from street junctions

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International Journal of Digital Earth 2023年第1期16卷 1944-1961页

作者： Biao He Renzhong Guo Minmin Li Ying Jing Zhigang Zhao Wei Zhu Chen Zhang Chengyue Zhang Ding Ma Research Institute for Smart Cities School of Architecture and Urban PlanningShenzhen University&MNR Technology Innovation Center of Territorial&Spatial Big Data&MNR Key Laboratory of Urban Land Resources Monitoring and Simulation&Guangdong-Hong Kong-Macao Joint Laboratory for Smart CitiesShenzhenPeople’s Republic of China Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ) ShenzhenPeople’s Republic of China Ningbo Institute of Technology School of EconomicsZhejiang UniversityNingboPeople’s Republic of China School of Resource and Environmental Sciences Wuhan UniversityWuhanPeople’s Republic of China

The underlying complexity of urban space can be manifested by its fractal forms and scaling *** paper examines these characteristics at the intra-urban scale through the lens of clustered street junctions(including road ends)in two Chinese metropolitan areas:Beijing and *** derived the cluster sets with Euclidean distance thresholds starting at 100 meters(m)and ending at 1000 m,and outlined each cluster using a concave-hull method to maintain their original irregular *** each delimited cluster,we examined four urban attributes:gross domestic product,number of street nodes,polygon area,and *** analysis revealed that power law distribution applied to almost every cluster set in terms of the four attributes,but varied from one attribute to another or from city to city,represented primarily byfluctuated power law exponents and ht-index values whose profiles along with the cluster growth can effectively characterize the urban ***,we computed the spectrum of intra-urban scaling exponents with cluster size increments,contributing new insights into the allometric relationships between urban configuration and function.

关键词： Spatial clustering urban structure urban function power law intra-urban scaling law

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A framework for mixed-use decomposition based on temporal activity signatures extracted from big geo-data

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International Journal of Digital Earth 2020年第6期13卷 708-726页

作者： Lun Wu Ximeng Cheng Chaogui Kang Di Zhu Zhou Huang Yu Liu Institute of Remote Sensing and Geographical Information Systems Peking UniversityBeijingPeople’s Republic of China Beijing Key Lab of Spatial Information Integration and Its Applications Peking UniversityBeijingPeople’s Republic of China School of Remote Sensing and Information Engineering Wuhan UniversityWuhanPeople’s Republic of China

Mixed use has been extensively applied as an urban planning principle and hinders the study of single urban *** address this problem,it is worth decomposing the mixed *** by the concept of spectral unmixing in remote sensing applications,this paper proposes a framework for mixed-use decomposition based on big *** decomposition in terms of human activities differs from traditional land use research,and it is more reasonable to infer the actual urban function of *** framework consists of four steps,namely temporal activity signature extraction,urban function base curve extraction,mixeduse decomposition,and result ***,the temporal activity signatures(TASs)of each zone are extracted as the proxy of human activity ***,the diurnal TASs of routine activities are extracted as urban function base curves(***).Third,a linear decomposition model is used to decompose the mixed use and obtain multiple results(urban function composition,dynamic activity proportions,and the mixing index).Finally,result validation strategies are *** framework offers method extensibility and has few requirements for the input *** is validated by means of a case study of Beijing,based on a social media check-in dataset.

关键词： Mixed use spatial–temporal pattern urban function human activity big geo-data

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城市职能体系的若干理论思考

中国地理

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中国地理 1999年第9期 19-23,30页

作者：张复明郭文炯

本文首先提出了城市职能的两个基本属性——由城市职能组分的配置关系所确定的结构属性和由城市职能的影响尺度及范围所反映的空间特征。接着揭示了城市职能的三个重要特征——等级特征、量态特征和同比特征，它们分别用职能层次、职能... 详细信息

本文首先提出了城市职能的两个基本属性——由城市职能组分的配置关系所确定的结构属性和由城市职能的影响尺度及范围所反映的空间特征。接着揭示了城市职能的三个重要特征——等级特征、量态特征和同比特征，它们分别用职能层次、职能规模和职能强度来表征，最后对这些概念的内涵和外延进行了分析讨论。

关键词：城市职能休系属性特征职能域职能组分职能尺度 urban function system property characteristic function domain function measure function component

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functional Characteristics of the Surrounding Area of Beijing Metro Line 5 Based on POI Data

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Journal of Landscape Research 2023年第3期15卷 27-31,38页

作者： SUN Shuai AI Jie LIU Ting North China University of Technology Beijing 100144China

As an important urban infrastructure,rail transit not only has transportation function,but also has a close connection and harmonious development with the surrounding urban *** Beijing Metro Line 5 as an example,each station of Beijing Metro Line 5 was analyzed by GIS software and Echarts chart based on POI *** functions of subway site type were divided into main function,secondary function and no significant function,and various types of sites within the main functional characteristics of urban functions were discussed in *** paper presents a new method for identifying urban functional features,which can be applied to not only other metro stations in Beijing but also the same type of ***,it lays a foundation for the research of rail transit subway stations and their related researches.

关键词： POI Subway station urban function

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信息时代城市功能及其空间结构的变迁

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地理 2004年第4期

作者：周年兴俞孔坚李迪华

城市化和信息化是当今世界城市发展面临的两大主题。这两者是相互作用、彼此促进的。该文论述了信息时代城市交通、居住、工作和游憩四大功能的转变，并进而通过土地利用方式的改变影响到城市空间结构的变迁，最后讨论了信息时代的城市... 详细信息

城市化和信息化是当今世界城市发展面临的两大主题。这两者是相互作用、彼此促进的。该文论述了信息时代城市交通、居住、工作和游憩四大功能的转变，并进而通过土地利用方式的改变影响到城市空间结构的变迁，最后讨论了信息时代的城市规划：1)城市规划管理体制的变革；2)城市增长极的重新思考；3)注重城市的绿色设计；4)注重非物质的城市规划；5)利用网络技术提高规划设计水平。

关键词：信息时代城市功能空间结构 information era urban function spatial structure

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基于城市休闲视角的生态园林建设初探

旅游管理

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旅游管理 2014年第12期 90-95页

作者：黄细嘉魏伟新

城市休闲与生态园林关联性强：一方面，城市休闲是生态园林的功能体现，是生态园林的建设目标；另一方面，生态园林是城市休闲区的有机构成，是城市休闲的空间载体和宜居城市的重要表征。城市休闲对生态园林建设提出了新的要求。为此，... 详细信息

城市休闲与生态园林关联性强：一方面，城市休闲是生态园林的功能体现，是生态园林的建设目标；另一方面，生态园林是城市休闲区的有机构成，是城市休闲的空间载体和宜居城市的重要表征。城市休闲对生态园林建设提出了新的要求。为此，应在建设理念上，突出社区参与，强化休闲游憩功能，注重人地和谐设计；在建设取向上，努力凸显与营造文化生态和打造独特的城市自然景观。

关键词：城市休闲生态园林城市功能 urban leisure ecologyical garden construction urban function

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近代城市发展与职业教育的关系研究

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职业技术教育 2024年第10期

作者：牌梦迪唐倩

中国近代职业教育随着城市现代化的发展而兴起、完善并日臻成熟，应城市发展需求而不断革新，同时亦推动城市向前进步。从洋务学堂之“制造工艺”，实业学堂之“民用经济”，到实用学堂之“社会需求”，职业教育的办学宗旨从自强求富变... 详细信息

中国近代职业教育随着城市现代化的发展而兴起、完善并日臻成熟，应城市发展需求而不断革新，同时亦推动城市向前进步。从洋务学堂之“制造工艺”，实业学堂之“民用经济”，到实用学堂之“社会需求”，职业教育的办学宗旨从自强求富变为获取生活幸福，从借鉴效仿国外到结合地情酌情兴办，现代化前沿城市天津与上海走出了各具风格的职业教育发展之路。文章以新式教育兴起之地的天津与上海为例，比较两地职业教育发展的差异之处及产生的不同作用，以探讨近代城市发展与职业教育的互动关系。

关键词：近代职业教育城市职能城市经济城市文化 modern vocational education urban function urban economy urban culture

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