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Yangtze River Delta Aerosol liquid water in PM_(2.5)and its roles in secondary aerosol formation at a regional site of Yangtze River Delta

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Journal of Environmental Sciences 2024年第4期138卷 684-696页

作者： Ruifang Shi Fei Zhang yemin shen Jiasi shen Bingye Xu Binyu Kuang Zhengning Xu Lingling Jin Qian Tang Xudong Tian Zhibin Wang College of Environmental and Resource Sciences Zhejiang Provincial Key Laboratory of Organic Pollution Process and ControlZhejiang UniversityHangzhou 310058China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China Zhejiang Ecological and Environmental Monitoring Center Hangzhou 310012China

Aerosol liquid water content(ALWC)plays an important role in secondary aerosol *** this study,a whole year field campaign was conducted at Shanxi in north Zhejiang Province during *** estimated by ISORROPIA-Ⅱ was then investigated to explore its characteristics and relationship with secondary *** exhibited a highest value in spring(66.38μg/m^(3)),followed by winter(45.08μg/m^(3)),summer(41.64μg/m^(3)),and autumn(35.01μg/m^(3)),*** was supposed that the secondary inorganic aerosols(SIA)were facilitated under higher ALWC conditions(RH>80%),while the secondary organic species tended to form under lower ALWC *** RH(>80%)promoted the NO_(3)^(-)formation via gas-particle partitioning,while SO_(4)^(2-)was generated at a relative lower RH(>50%).The ALWC was more sensitive to NO_(3)^(-)(R=0.94)than SO_(4)^(2-)(R=0.90).Thus,the self-amplifying processes between the ALWC and SIA enhanced the particle mass *** sensitivity of ALWC and OX(NO_(2)+O_(3))to secondary organic carbon(SOC)varied in different seasons at Shanxi,more sensitive to aqueous-phase reactions(daytime R=0.84;nighttime R=0.54)than photochemical oxidation(daytime R=0.23;nighttime R=0.41)in wintertime with a high level of OX(daytime:130-140μg/m^(3);nighttime:100-140μg/m^(3)).The self-amplifying process of ALWC and SIA and the aqueous-phase formation of SOC will enhance aerosol formation,contributing to air pollution and reduction of visibility.

关键词： Aerosol liquid water content Nitrate Sulfate Secondary organic compounds Aqueous-phase reaction

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近10年浙江省城市环境空气质量变化趋势及影响因素分析

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环境污染与防治 2017年第6期39卷 610-615,619页

作者：徐冰烨俞洁沈叶民浙江省环境监测中心

利用浙江省环境空气中SO_2、NO_2和PM_(10)监测数据,采用Daniel趋势检验法,研究了近10年(2005—2014年)浙江省城市环境空气质量变化趋势及影响因素。结果表明:(1)2005—2014年,浙江省县级以上城市综合污染指数平均值呈显著下降趋势,总... 详细信息

利用浙江省环境空气中SO_2、NO_2和PM_(10)监测数据,采用Daniel趋势检验法,研究了近10年(2005—2014年)浙江省城市环境空气质量变化趋势及影响因素。结果表明:(1)2005—2014年,浙江省县级以上城市综合污染指数平均值呈显著下降趋势,总体环境空气质量呈好转趋势。(2)SO_2年均值呈不显著下降趋势,NO_2年均值基本保持稳定,PM_(10)年均值呈显著下降趋势。浙江省SO_2、NO_2和PM_(10)浓度高值区域主要分布在浙中北部地区,与2005年相比,2014年浓度高值区域面积减少,污染程度降低。(3)SO_2、NO_2和PM_(10)月均值变化趋势基本一致,浓度高值主要出现在1、11、12月,低值集中出现在6—9月。(4)PM_(10)为城市大气中首要污染物,NO_2污染负荷呈显著上升趋势,表明浙江省城市空气污染特征逐渐从煤烟型污染过渡到机动车尾气型污染。(5)产业结构升级、能源结构优化、大气污染物总量减排和污染源综合整治等人为控制措施对城市空气质量改善起到重要作用。地形、气象、沙尘等自然因素是大气污染物浓度时空变化的外因。

关键词：环境空气质量 SO2 NO2 PM10 浙江省

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大力开发与提升图书馆公共文化服务能力

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新世纪图书馆 2010年第1期 97-99页

作者：沈业民扬州市图书馆

论文提出图书馆大力开发与提升公共文化服务能力的理念,围绕提升公共文化服务内涵、提高公共文化产品供给、丰富公共文化服务内容、打造公共文化服务品牌,提出了一些新的思路。作者认为:只有进一步解放思想、开拓创新,积极实践和探索开... 详细信息

论文提出图书馆大力开发与提升公共文化服务能力的理念,围绕提升公共文化服务内涵、提高公共文化产品供给、丰富公共文化服务内容、打造公共文化服务品牌,提出了一些新的思路。作者认为:只有进一步解放思想、开拓创新,积极实践和探索开发与提升公共文化服务能力的新途径和新办法,才能不断发挥图书馆在公共文化服务体系中的重要作用和影响。

关键词：图书馆公共文化服务

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杭州市临安区挥发性有机物污染特征与来源解析

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环境污染与防治 2023年第8期45卷 1150-1155,1175页

作者：马勤许振波杨冰雪沈磊沈叶民杭州市临安生态环境监测站浙江杭州311399 浙江环科环境研究院有限公司浙江杭州310000 浙江省生态环境监测中心浙江杭州310012

为探究杭州市临安区大气挥发性有机物(VOCs)的污染特征,于2021年12月至2022年10月对临安区VOCs组分进行连续在线监测,分析了VOCs的臭氧生成潜势(OFP),并利用正定矩阵因子分解(PMF)模型对VOCs的主要排放源进行解析。结果表明,观测期间临... 详细信息

为探究杭州市临安区大气挥发性有机物(VOCs)的污染特征,于2021年12月至2022年10月对临安区VOCs组分进行连续在线监测,分析了VOCs的臭氧生成潜势(OFP),并利用正定矩阵因子分解(PMF)模型对VOCs的主要排放源进行解析。结果表明,观测期间临安区大气总VOCs(TVOCs)的平均体积分数为46.57×10^(-9),TVOCs中占比最高的是含氧有机物(36.72%)。TVOCs呈现出冬季(53.14×10^(-9))>春季(47.46×10^(-9))>夏季(43.83×10^(-9))>秋季(38.16×10^(-9))的季节变化特征。观测期间,VOCs的总OFP为175.42μg/m3,芳香烃和烯烃对OFP有较大的贡献,贡献率分别为42.41%和37.60%。源解析结果表明,机动车排放源和液化天然气/石油气使用源是临安区VOCs的主要来源,而有机溶剂/油气挥发源对VOCs的OFP贡献率最大;控制临安区臭氧污染需要重点关注当地有机溶剂使用、油气挥发、液化天然气/石油气使用和机动车排放等问题。

关键词：挥发性有机物臭氧生成潜势季节变化源解析关键物种

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Environmental Inequality in China’s Urban Expansion:A Case Study of Guangzhou,China

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Chinese Geographical Science 2025年第1期35卷 187-202页

作者： WANG Shaogu shen Jing School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510006China

Environmental inequality is a prevalent issue in developing countries undergoing urban *** expansion induces the formation and evolution of environmental inequality by creating environmental and structural conditions that lead to the spatial relocation of environmental hazards and the socio-spatial segregation of different groups in developing *** study investigated the spatial patterns and temporal trends of environmental inequality under urban expansion in Guangzhou,a megacity in *** considered how environmental disparities and socio-demographic attributes interact in terms of industrial pollution exposure using additive semiparametric quantile regression,combined with spatial visualisation,on the basis of the economic and population census data from 1990 to *** study revealed that urban expansion sparked the spatial displacement of environmental risks and the social-spatial differentiation,exposing the peripheral regions and disadvantaged groups to higher environmental risks.A reciprocal transformation occurred between central and peripheral regions,as well as a process of redistributing environmental risks across social *** the context of urban expansion in developing countries,the causes of environmental inequality shifted from individual socio-economic differences to structural factors,such as industrial layout and social division of labour in cities,leading to the spatial displacement and concealment of environmental *** study provides insights and guidance for policymakers to address the issue of environmental inequality in the context of urban expansion.

关键词： environmental inequality urban expansion spatiotemporal evolution additive semiparametric quantile regression Guangzhou,China

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Evaluating the accuracy of earth rotation parameters based on the BDS observations

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Geodesy and Geodynamics 2025年第1期16卷 87-98页

作者： Chenxiang Wang Pengfei Zhang Tengxu Zhang Ziyu shen Jizhang Sang Wenbin shen School of Geodesy and Geomatics Wuhan University Time and Frequency Geodesy Center Wuhan University School of Resource Environmental Science and Engineering Hubei University of Science and Technology

The Bei Dou satellite system(BDS) has progressed with the full operationalization of the secondgeneration regional system(BDS-2) and the third-generation global system(BDS-3). This technology plays a crucial role in determining Earth Rotation Parameters(ERPs). In this study, we determine the ERPs based on the observations of BDS-2, BDS-3 and BDS-2+BDS-3, with the time spanning from August18, 2022, to August 18, 2023. The IERS EOP 20C04 series is used as a reference to evaluate the accuracy of the ERP estimates. We analyze the impact of different numbers of reference stations, polyhedron volumes, observation arc lengths, satellite types, and satellite systems on solving ERPs using BDS-2 and BDS-3 observation data provided by the International GNSS Service(IGS) stations. When selecting a specific satellite type, it is necessary to choose an appropriate observation arc length based on different numbers of reference stations while maximizing the volume of the formed polyhedron to achieve optimal efficiency and accuracy in parameter estimation. When both the number of reference stations and observation arc length are fixed, higher precision of the ERPs can be achieved using observations from MEO than MEO + IGSO and MEO + IGSO + GEO. Moreover, when considering only IGSO and MEO satellites as options for analysis purposes, BDS-3 provides higher accuracy compared to BDS-2. In summary, when using BDS for ERP estimation and MEO satellite observations with the same observation arc length,selecting stations from reference stations with larger polyhedral volumes can significantly improve the efficiency and accuracy of parameter estimation.

关键词： Earth rotation parameters Polyhedron volume Observation arc length BDS-2 BDS-3

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Evaluating complementaries among urban water,energy,infrastructure,and social Sustainable Development Goals in China

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Journal of Environmental Sciences 2025年第3期149卷 585-597页

作者： Ke Yu Yifan Song Jin Lin shen Qu School of Management and Economics Beijing Institute of TechnologyBeijing 100081China Center for Energy&Environmental Policy Research Beijing Institute of TechnologyBeijing 100081China

Urban areas’performance in water,energy,infrastructure,and socio-economic sectors is intertwined and measurable through Sustainable Development Goals(SDGs)6–*** synergy among these is critical for *** study constructs an indicator framework that reflects progress towards these urban SDGs in *** indicate underperformance in SDGs 8–11,suggesting the need for transformative *** network analysis,the research reveals complementarities among these ***,the SDG space divides into socio-economic and ecological clusters,with SDG 6(Clean Water and Sanitation)central to ***,SDG 8(Decent Work and Economic Growth)and SDG 9(Industry,Innovation,and Infrastructure)act as bridges,while greater synergies exist between SDG 12(Responsible Consumption and Production)and SDG 13(Climate Action).An in-depth view at the indicator-level shows a core-periphery structure,emphasizing indicators like SDG 6.2(Wastewater Treatment Rate)and SDG 6.6(Recycled Water Production Capacity per capita)as *** study confirms the urban SDG space’s stability and predictiveness,underscoring its value in steering well-aligned policy decisions for sustainable growth.

关键词： Sustainable development goals Synergy Urban development Policy decisions

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Axial emission characteristics of an ionic liquid electrospray thruster with a circular emitter

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Chinese Journal of Aeronautics 2025年第1期38卷 297-305页

作者： Cheng YANG Jiawei LUO Xiangbei WU Yan shen School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518107China shenzhen Key Laboratory of Intelligent Microsatellite Constellation Shenzhen 518107China

Ionic Liquid Electrospray Thrusters(ILETs)are well suited for micro-nano satellite applications due to their small size,low power consumption,and high specific ***,the limited thrust of a single-emitter ILET restricts its use in space *** optimize the performance of ILETs and make them suitable for a wider range of space missions,we designed a Circular-emitter ILET(CILET)to convert a one-dimensional(point)emission into a twodimensional(line)*** CILET can self-organize multiple Taylor cones *** cones were photographed and the axial emission currents were measured under different voltage and pressure difference conditions with a CILET experimental *** emission can be divided into two stable states and one unstable state based on the flow and current *** current in Stable state Ⅰ increases non-linearly with the voltage,while that in Stable state Ⅱ is nearly linear with respect to the *** number of cones increases with the voltage in stable states,while the cones become short and crowded under high-voltage *** variation law of the number of cones can be explained with the self-organization *** variation in the current exhibits a good correlation with the number of *** study demonstrates the feasibility of circular emitters and experimentally indicates that the emission current is improved by approximately two orders of magnitude compared to that of a single capillary.

关键词： Electrospray Ionic liquid thruster Self-organize Emitter Taylor cone

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家校协同机制下留守儿童积极同伴交往意识培育探索

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成才之路 2023年第7期 141-144页

作者：沈晔敏姜永志内蒙古民族大学教育科学学院内蒙古通辽028000 内蒙古家庭教育研究基地内蒙古通辽028000 内蒙古民族教育与心理发展研究基地内蒙古通辽028000

留守儿童的积极同伴交往对其健康成长具有促进作用。当前,部分家长和教师对留守儿童同伴交往的重视程度不足,这使得留守儿童的同伴群体会出现欺凌现象。家庭和学校是留守儿童最直接接触的两个社会子系统,以家校协同的视角探讨培育留守... 详细信息

留守儿童的积极同伴交往对其健康成长具有促进作用。当前,部分家长和教师对留守儿童同伴交往的重视程度不足,这使得留守儿童的同伴群体会出现欺凌现象。家庭和学校是留守儿童最直接接触的两个社会子系统,以家校协同的视角探讨培育留守儿童积极同伴交往意识的对策,有助于促进留守儿童构建健康的同伴关系。文章分析留守儿童同伴交往的现状,明确留守儿童积极同伴交往意识培育的重要性,并指出家校协同机制下留守儿童积极同伴交往意识的培育策略。

关键词：家校协同留守儿童同伴交往意识培育策略

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Advances in flexible weak-light detectors based on perovskites:preparation,optimization,and application

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Journal of Semiconductors 2025年第1期46卷 144-164页

作者： Yaqian Yang Ying Li Di Chen Guozhen shen School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors,imaging,optical communication,and ***,the detection of weak light signals is often severely interfered by multiple factors such as background light,dark noise and circuit noise,making it difficult to accurately capture *** traditional technologies like silicon photomultiplier tubes excel in sensitivity,their high cost and inherent fragility restrict their widespread *** this background,perovskite materials have rapidly emerged as a research focus in the field of photodetection due to their simple preparation processes and exceptional optoelectronic *** only are the preparation processes of perovskite materials straightforward and cost-effective,but more importantly,they can be flexibly integrated into flexible and stretchable *** characteristic significantly compensates for the shortcomings of traditional rigid electronic devices in specific application scenarios,opening up entirely new possibilities for photodetection ***,recent advances in perovskite light detection technology are ***,the chemical and physical properties of perovskite materials are discussed,highlighting their remarkable advantages in weak-light ***,the review systematically organizes various preparation techniques of perovskite materials and analyses their advantages in different application ***,from the two core dimensions of performance improvement and light absorption enhancement,the key strategies of improving the performance of perovskite weak-light photodetectors are ***,the review concludes with a brief summary and a discussion on the potential challenges that may arise in the further development of perovskite devices.

关键词： perovskite weak-light photodetector flexible

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