检索结果-南通市图书馆

Big Earth Data 2022年第1期6卷 77-89页

作者： Jinhu Bian Ainong Li Xi Nan Guangbin Lei Zhengjian Zhang Research Center for Digital Mountain and Remote Sensing Application Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina

Mountains are undergoing widespread changes caused by human activities and climate change.Given the importance of mountains,the protection and sustainable development of mountain ecosys-tems have been listed as the goals of the United Nations 2030 Sustainable Development Agenda.As one of the indicators,the Mountain Green Cover Index(MGCI)datasets can provide consis-tent and comparable status of green vegetation in mountainous areas,which can support the mapping of heterogeneous mountain ecosystem health and monitoring changes over time.The produc-tion of explicitly high-spatial-resolution MGCI datasets is therefore urgently needed to support the protection measures at subnational and multitemporal scales.In this paper,the MGCI datasets with 500-meter spatial resolutions,covering the economic corridors of the Belt and Road Initiative(BRI),were developed for 2010 to 2019 based on all available Landsat-8 data and the Google Earth Engine cloud computing platform.The validation of green vegeta-tion cover with the ground-truth samples indicated that the data-sets can achieve an overall accuracy of 94.06%,with well-detailed spatial and temporal variations.The archived datasets include the MGCI of each BRI economic corridor,matched to a geospatial layer denoting the economic corridor boundaries.The essential informa-tion of the datasets and their limitations,along with the production flow,were described in this paper.

关键词： Sustainable development goals(SDGs) mountain green cover index(MGCI) dataset Belt and Road Landsat

A review of land use/land cover change mapping in the China-Central Asia-West Asia economic corridor countries

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Big Earth Data 2021年第2期5卷 237-257页

作者： Amin Naboureh Jinhu Bian Guangbin Lei Ainong Li Research Center for Digital Mountain and Remote Sensing Application Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina University of Chinese Academy of Sciences BeijingChina

Large-scale projects,such as the construction of railways and highways,usually cause an extensive Land Use Land Cover Change(LULCC).The China-Central Asia-West Asia Economic Corridor(CCAWAEC),one key large-scale project of the Belt and Road Initiative(BRI),covers a region that is home to more than 1.6 billion people.Although numerous studies have been conducted on strategies and the economic potential of the Economic Corridor,reviewing LULCC mapping studies in this area has not been studied.This study provides a comprehensive review of the recent research progress and discusses the challenges in LULCC monitoring and driving factors identifying in the study area.The review will be helpful for the decision-making of sustainable development and construction in the Economic Corridor.To this end,350 peer-reviewed journal and conference papers,as well as book chapters were analyzed based on 17 attributes,such as main driving factors of LULCC,data collection methods,classification algorithms,and accuracy assessment methods.It was observed that:(1)rapid urbanization,industrialization,population growth,and climate change have been recognized as major causes of LULCC in the study area;(2)LULCC has,directly and indirectly,caused several environmental issues,such as biodiversity loss,air pollution,water pollution,desertification,and land degradation;(3)there is a lack of well-annotated national land use data in the region;(4)there is a lack of reliable training and reference datasets to accurately study the long-term LULCC in most parts of the study area;and(5)several technical issues still require more attention from the scientific community.Finally,several recommendations were proposed to address the identified issues.

关键词： Land use change land cover change China-Central Asia-West Asia Economic Corridor accuracy assessment reference data classification algorithm

A geo-spatial database about the eco-environment and its key issues in South Asia

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Big Earth Data 2018年第3期2卷 298-319页

作者： Ainong Li Wei Deng Wei Zhao Bintao Liu Jianqiang Zhang Bo Kong Xi Nan Jinhu Bian Hriday Lal Koirala Hammad Gilani Vishwambhar Prasad Sati Pattiyage I.A.Gomes Narendra Raj Khanal Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengduChina Branch of Mountain Sciences Kathmandu Center for Research and EducationCASChengduChina Central Department of Geography Tribhuvan UniversityKathmanduNepal Institute of Space Technology IslamabadPakistan Department of Geography and Resource Management School of Earth SciencesMizoram UniversityAizawlIndia Department of Civil Engineering Institute of Information TechnologyMalabeSri Lanka

The South Asia has high variability in geographical features,climate,andlandscapes.With the rapid economic development and population growth,the increased pressure on natural resources,land degradation,water crisis,and climate change become the common concerns forthe countries in the region.To get a deep and general idea about the land and water natural resources and environment in South Asia,a knowl-edge database was constructed based on the climatic condition,land use/cover,waterresources,water disasters,and geohazards.There sults presented a scientific insight regarding the spatio-temporal changing pattern of the eco-environ mental components in this region.Risk assessments were performed for the floods,droughts,and geohazards which occurred with a high frequency.In general,the big knowledge database established in this study would be helpful to aid the devel-opment of future policies and programs(like the Belt and Road Initiative)for environmental issues adaptation in the region,including initiatives for regional cooperation and capacity building in natural resources and environment management.

关键词： South Asia eco-environment water resource geohazard climate change assessment

HPLC-MS/MS测定新生儿血浆中氟氯西林的浓度及其与氨溴索相互作用的研究

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中国现代应用药学 2023年第22期40卷 3158-3163页

作者：陈灵郭婷邵钰边俊梅吴金虎武汉市第三医院(武汉大学附属同仁医院)药学部武汉430060 武汉市第三医院(武汉大学附属同仁医院)儿科武汉430060 重庆医科大学附属璧山医院(重庆市璧山区人民医院)药学部重庆402760 北京市昌平区中医医院药学部北京102200

目的建立一种高效、简便的HPLC-MS/MS方法检测新生儿血浆中氟氯西林的浓度,研究新生儿体内氨溴索与氟氯西林是否存在相互作用。方法生物样本采用API4000 HPLC-MS/MS进行分析,色谱柱为Ultimate XB-C18(2.1 mm×100 mm,5μm),流动相A相为... 详细信息

目的建立一种高效、简便的HPLC-MS/MS方法检测新生儿血浆中氟氯西林的浓度,研究新生儿体内氨溴索与氟氯西林是否存在相互作用。方法生物样本采用API4000 HPLC-MS/MS进行分析,色谱柱为Ultimate XB-C18(2.1 mm×100 mm,5μm),流动相A相为水-0.1%甲酸,B相为乙腈-0.1%甲酸。氟氯西林和内标利福平定量分析离子对分别为m/z 452.6→284.2和m/z 821.4→397.3。结果在该分析方法下氟氯西林的线性范围为0.20~80 ng·mL–1,定量下限为0.20 ng·mL^(–1);氟氯西林的日内精密度和日间精密度均<8.23%;提取回收率为85.3%~89.2%,基质效应为89.3%~92.3%;新生儿血浆样品在室温条件下放置12 h,处理后室温条件下放置4 h,反复冻融3次及–20℃冷冻30 d的稳定性均良好。临床样本检测结果表明氨溴索合用可以显著提高氟氯西林血药浓度。结论本研究所建立的HPLC-MS/MS分析方法准确度高,灵敏度好,可用于新生儿血浆中氟氯西林浓度的测定。临床研究结果表明氨溴索能显著提升氟氯西林的血药浓度,两者存在药物相互作用。

关键词：氟氯西林氨溴索药物-药物相互作用 HPLC-MS/MS

Landsat-8 OLI与Sentinel-2 MSI山区遥感影像辐射一致性研究

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遥感技术与应用 2018年第3期33卷 428-438页

作者：钟函笑边金虎李爱农中国科学院水利部成都山地灾害与环境研究所四川成都610041 中国科学院大学北京100049

受影像获取时间、大气条件、观测角度、传感器波段设置以及山地地形等因素的影响,山区多源、多时相光学遥感卫星影像间的辐射不一致问题较为突出。以Landsat-8 OLI与Sentinel-2 MSI为例探究山地多源遥感影像间的辐射一致性,旨在为多源... 详细信息

受影像获取时间、大气条件、观测角度、传感器波段设置以及山地地形等因素的影响,山区多源、多时相光学遥感卫星影像间的辐射不一致问题较为突出。以Landsat-8 OLI与Sentinel-2 MSI为例探究山地多源遥感影像间的辐射一致性,旨在为多源影像在山区的协同应用提供理论支持。选取同期OLI和MSI影像,进行大气校正、BRDF校正、光谱通道校正以及影像间的辐射一致性分析,并研究地形对辐射一致性的影响。结果表明:(1)未经校正的Landsat-8 OLI-L1T与Sentinel-2 MSI-L1C反射率影像间的辐射一致性较高(各波段R2均大于0.9);(2)经过6S大气校正、C因子法BRDF校正,影像间辐射一致性进一步提高(如蓝波段反射率RMSD依次减小22%、10%),但光谱通道校正后一致性并未显著增强;(3)地形效应导致了影像阴坡、阳坡辐射一致性水平的较大差异(如BRDF校正后SWIR波段阳坡的反射率平均绝对差为0.010、RMSD为0.006 6,阴坡平均绝对差为0.005、RMSD为0.004 3),且阳坡辐射差异随坡度增大而增大,阴坡则相反。因此,在进行多源遥感影像协同之前,需要进行有效的大气校正、BRDF校正以及光谱通道校正。另外,针对山地遥感影像还应开展地形辐射校正以进一步提高影像间的辐射一致性。

关键词： Landsat-8 Sentinel-2 辐射一致性 BRDF校正光谱通道校正山地

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缅甸土地覆被遥感制图和空间格局分析

遥感技术与应用 2022年第1期37卷 148-160页

作者：赵辉王泽根雷光斌边金虎李爱农西南石油大学土木工程与测绘学院四川成都610500 西南石油大学地球科学院与技术学院四川成都610500 中国科学院、水利部成都山地灾害与环境研究所四川成都610041

在“一带一路”倡议框架下,中缅经济走廊逐步从概念转入实质规划建设阶段,了解和掌握缅甸土地覆被的空间格局和分布特征对于合理开发利用资源、制定务实的经济廊道建设规划具有重要的战略意义。利用Landsat-8 OLI遥感影像数据,基于多分... 详细信息

在“一带一路”倡议框架下,中缅经济走廊逐步从概念转入实质规划建设阶段,了解和掌握缅甸土地覆被的空间格局和分布特征对于合理开发利用资源、制定务实的经济廊道建设规划具有重要的战略意义。利用Landsat-8 OLI遥感影像数据,基于多分类器集成的面向对象迭代分类方法(OIC-MCE),生产了缅甸2015年30 m分辨率土地覆被产品(MyanmarLC-2015)。采用Google Earth高分辨率影像获取验证样本用于产品精度验证,验证结果表明:MyanmarLC-2015产品的总体分类精度为89.05%,Kappa系数为0.87,各类别的用户精度和制图精度均超过72%,能够准确地反映缅甸土地覆被类型的空间格局。根据产品统计,林地是缅甸面积最大的土地覆被类型,占国土面积56.15%,以常绿阔叶林为主,占林地面积83.57%。耕地面积次之,占国土面积27.01%。地形因子对缅甸土地覆被类型空间分布格局有显著的影响,随着海拔升高,呈现出按如下顺序的垂直地带性特征:森林湿地、水田、旱地、落叶灌木林、落叶阔叶林、常绿灌木林、常绿阔叶林、常绿针叶林。从植被生产力的角度来看,缅甸东部、东北部和东南部植被NPP最大,中部干旱地区和南部伊洛瓦底江三角洲植被NPP较低。缅甸2015年植被平均净初级生产力中常绿林地类型高于落叶林地,阔叶林的高于灌木林,耕地中旱地生产力高于水田。

关键词：缅甸土地覆被遥感空间格局植被净初级生产力(NPP)

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遥感反演蒸散发时间尺度拓展方法研究进展

农业工程学报 2015年第24期31卷 162-173页

作者：夏浩铭李爱农赵伟边金虎中国科学院水利部成都山地灾害与环境研究所成都610041 中国科学院大学北京100049

区域尺度蒸散发的精确估算对农业生态系统和水文循环至关重要。由于地表空间异质性,传统点上测量和反演方法只能代表有限站点周围区域的蒸散发情况,遥感能够克服传统蒸散发的空间尺度拓展问题。由于遥感只能提供卫星过境时刻的瞬时值,... 详细信息

区域尺度蒸散发的精确估算对农业生态系统和水文循环至关重要。由于地表空间异质性,传统点上测量和反演方法只能代表有限站点周围区域的蒸散发情况,遥感能够克服传统蒸散发的空间尺度拓展问题。由于遥感只能提供卫星过境时刻的瞬时值,根据其反演的蒸散发是瞬时蒸散发,现实生产活动中通常需要更长时间尺度的蒸散发值。围绕如何解决遥感反演蒸散发时间尺度拓展问题,该文系统介绍了遥感反演蒸散发时间尺度拓展方法,总结了每种方法的基本原理、优缺点、适用性和误差来源,对比了不同时间尺度拓展方法估算精度,并给出选取合适时间尺度拓展方法的可量化意见,简要分析了遥感反演蒸散发模型应用中的地表参数、时间尺度拓展方法本身算法、方法验证及适用性的不确定性,最后对遥感反演蒸散发时间尺度拓展方法的发展趋势进行了探讨。

关键词：遥感蒸散发不确定性分析时间尺度拓展方法

基于网络图的地基激光雷达复杂树木点云枝叶分离方法

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遥感技术与应用 2022年第1期37卷 161-172页

作者：林筱涵李爱农边金虎张正建南希中国科学院水利部成都山地灾害与环境研究所数字山地与遥感应用中心四川成都610041 中国科学院大学资源与环境学院北京100049

地基激光雷达树木点云数据的枝叶分离是精确计算地上生物量和叶面积指数的重要前提,也是树木三维建模的重要步骤。然而,山地复杂树木冠幅大且结构复杂,从而造成树叶与枝干之间的相互遮挡,因此很难获取高质量的点云数据,目前对其实现枝... 详细信息

地基激光雷达树木点云数据的枝叶分离是精确计算地上生物量和叶面积指数的重要前提,也是树木三维建模的重要步骤。然而,山地复杂树木冠幅大且结构复杂,从而造成树叶与枝干之间的相互遮挡,因此很难获取高质量的点云数据,目前对其实现枝叶分离依然存在较大的困难。利用地基激光雷达FARO Focus3DX330获取三维激光点云数据,提出了一种基于网络图的树木点云枝叶分离方法。首先,采用LeWos模型对点云进行初步的枝叶分离,分离出枝干和叶片点云。在此基础上,针对枝干和叶片混合点云通过路径追踪检测算法来精细分离枝干和叶片。随着路径长度从10增加到100,枝干点不断增加,叶片点不断减少,枝叶分离精确度、枝干F分数、叶片F分数、Kappa系数均先增加后减少。综合这4项精度评价指标,选取各个树木最优路径长度执行路径追踪检测算法。通过与LeWos模型、Tlseparation模型和高斯混合模型等主流枝叶分离方法比较发现,该方法精度更优,精确度为91.97%。而且,该方法的枝干F分数和叶片F分数均大于85%,这表明该方法具有很好的平衡性。该方法仅使用路径长度,不考虑几何特征,因此极大地提高了针叶树木的枝叶分离精度。同时,该方法对不同树种、不同密度点云枝叶分离效果均较好,鲁棒性强。精确的树木点云枝叶分离对森林资源管理和生物多样性研究等具有重要意义。

关键词：地基激光雷达枝叶分离网络图 LeWos模型路径追踪检测算法

Kinetic-Thermodynamic Promotion Engineering toward High-Density Hierarchical and Zn-Doping Activity-Enhancing ZnNiO@CF for High-Capacity Desalination

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NANO-MICRO LETTERS 2024年第1期16卷 1-16页

作者： Ma, Jie Xing, Siyang Wang, Yabo Yang, jinhu Yu, Fei Shanghai Ocean Univ Coll Marine Ecol & Environm Shanghai 201306 Peoples R China Kashi Univ Sch Civil Engn Kashi 844000 Peoples R China Tongji Univ Coll Environm Sci & Engn Res Ctr Environm Funct Mat 1239 Siping Rd Shanghai 200092 Peoples R China Washington Univ St Louis Dept Energy Environm & Chem Engn St Louis MO 63130 USA Tongji Univ Sch Chem Sci & Engn 1239 Siping Rd Shanghai 200092 Peoples R China

Through facial basicity adjustment, kinetically favorable ZnxNi1-xO@CF electrode was formed with a high density hierarchical structure and three dimensional open pores.The optimal Zn-doping ratio in ZnxNi1-xO@CF has excellent sodium storage and desalination performance (128.9 mg g-1).The mechanism of Na+ intercalation process was studied by electrochemical quartz crystal microbalance with dissipation monitoring in situ test and the activation mechanism of redox-inert Zn-doping on electrode materials was reported. Despite the promising potential of transition metal oxides (TMOs) as capacitive deionization (CDI) electrodes, the actual capacity of TMOs electrodes for sodium storage is significantly lower than the theoretical capacity, posing a major obstacle. Herein, we prepared the kinetically favorable ZnxNi1 - xO electrode in situ growth on carbon felt (ZnxNi1 - xO@CF) through constraining the rate of OH- generation in the hydrothermal method. ZnxNi1 - xO@CF exhibited a high-density hierarchical nanosheet structure with three-dimensional open pores, benefitting the ion transport/electron transfer. And tuning the moderate amount of redox-inert Zn-doping can enhance surface electroactive sites, actual activity of redox-active Ni species, and lower adsorption energy, promoting the adsorption kinetic and thermodynamic of the Zn0.2Ni0.8O@CF. Benefitting from the kinetic-thermodynamic facilitation mechanism, Zn0.2Ni0.8O@CF achieved ultrahigh desalination capacity (128.9 mgNaCl g-1), ultra-low energy consumption (0.164 kW h kgNaCl-1), high salt removal rate (1.21 mgNaCl g-1 min-1), and good cyclability. The thermodynamic facilitation and Na+ intercalation mechanism of Zn0.2Ni0.8O@CF are identified by the density functional theory calculations and electrochemical quartz crystal microbalance with dissipation monitoring, respectively. This research provides new insights into controlling electrochemically favorable morphology and demonstrates that Zn-doping, which is redox-inert, is essential for enhancing the electrochemic

关键词： Zinc-nickel metal oxide High-density hierarchical Capacitive deionization Zinc-doping SODIUM-ION FARADAIC REACTIONS PERFORMANCE DEIONIZATION SUPERCAPACITOR NANOPARTICLES NANOSHEETS ELECTRODE GRAPHENE INTERCALATION

Neural-network-based fully distributed formation control for nonlinear multi-agent systems with event-triggered communication

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Science China(Technological Sciences) 2024年第1期67卷 209-220页

作者： ZHU GuoLiang LIU KeXin GU HaiBo LÜjinhu School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Zhongguancun Laboratory Beijing 100094China

This paper investigates the consensus-based formation control problem for multi-agent systems with unknown nonlinear dynamics.To achieve the desired formation,we propose two formation controllers to achieve the desired formation,one based on system states and the other on system outputs.The proposed controllers utilize adaptive gains to avoid global information and neural networks to estimate and compensate for nonlinearities.The proposed event-triggered schemes avoid continuous communication among agents and exclude the Zeno behavior.Stability analysis reveals that formation errors are bounded,and numerical simulations are used to validate the effectiveness of the proposed approaches.

关键词： formation control neural network adaptive control event-triggered communication multi-agent systems