Achieving a highly robust zinc(Zn)metal anode is extremely important for improving the performance of aqueous Zn-ion batteries(AZIBs)for advancing“carbon neutrality”society,which is hampered by the uncontrollable gr...Achieving a highly robust zinc(Zn)metal anode is extremely important for improving the performance of aqueous Zn-ion batteries(AZIBs)for advancing“carbon neutrality”society,which is hampered by the uncontrollable growth of Zn dendrite and severe side reactions including hydrogen evolution reaction,corrosion,and passivation,etc.Herein,an interlayer containing fluorinated zincophilic covalent organic framework with sulfonic acid groups(COF-S-F)is developed on Zn metal(Zn@COF-S-F)as the artificial solid electrolyte interface(SEI).Sulfonic acid group(-SO_(3)H)in COF-S-F can effectively ameliorate the desolvation process of hydrated Zn ions,and the three-dimensional channel with fluoride group(-F)can provide interconnected channels for the favorable transport of Zn ions with ion-confinement effects,endowing Zn@COF-S-F with dendrite-free morphology and suppressed side reactions.Consequently,Zn@COF-S-F symmetric cell can stably cycle for 1,000 h with low average hysteresis voltage(50.5 m V)at the current density of 1.5 m A cm^(-2).Zn@COF-S-F|Mn O_(2)cell delivers the discharge specific capacity of 206.8 m Ah g^(-1)at the current density of 1.2 A g^(-1)after 800 cycles with high-capacity retention(87.9%).Enlightening,building artificial SEI on metallic Zn surface with targeted design has been proved as the effective strategy to foster the practical application of high-performance AZIBs.展开更多
Aqueous zinc-ion batteries(AZIBs) hold great promise as a viable alternative to lithium-ion batteries owing to their high energy density and environmental friendliness.However,AZIBs are consistently plagued by the for...Aqueous zinc-ion batteries(AZIBs) hold great promise as a viable alternative to lithium-ion batteries owing to their high energy density and environmental friendliness.However,AZIBs are consistently plagued by the formation of zinc dendrites and concurrent side reactions,which significantly diminish their overall service life,In this study,the glass fiber separator(GF) is modified using zeolite imidazole salt framework-8(ZIF-8),enabling the development of efficient AZIBs.ZIF-8,which is abundant in nitrogen content,efficiently regulates the desolvation of [Zn(H_(2)O)_(6)]^(2+) to inhibit hydrogen production.Moreover,it possesses abundant nanochannels that facilitate the uniform deposition of Zn~(2+) via a localized action,thereby hindering the formation of dendrites.The insulating properties of ZIF-8 help prevent Zn^(2+) and water from trapping electron reduction at the layer surface,which reduces corrosion of the zinc anode.Consequently,ZIF-8-GF achieves the even transport of Zn^(2+) and regulates the homogeneous deposition along the Zn(002) crystal surface,thus significantly enhancing the electrochemical performance of the AZIBs,In particular,the Zn|Zn symmetric cell with the ZIF-8-GF separator delivers a stable cycle life at0.5 mA cm^(-2) of 2300 h.The Zn|ZIF-8-GF|MnO_(2) cell exhibits reduced voltage polarization while maintaining a capacity retention rate(93.4%) after 1200 cycles at 1.2 A g^(-1) The unique design of the modified diaphragm provides a new approach to realizing high-performance AZIBs.展开更多
Aqueous zinc ion batteries(AZIBs)are promising energy storage devices.However,the formation of dendrites,hydrogen evolution,and corrosion reaction seriously affect their electrochemical performance.Herein,the synergis...Aqueous zinc ion batteries(AZIBs)are promising energy storage devices.However,the formation of dendrites,hydrogen evolution,and corrosion reaction seriously affect their electrochemical performance.Herein,the synergistic effect of ion-migration regulation and interfacial engineering has been confirmed as the potential strategy by kaolin functionalized glass fiber separator(KL-GF)to alleviate these problems.The rapid and orderly Zn^(2+)migration was achieved to improve the transfer kinetics and induced uniform zinc deposition by more zinc-philic sites of KL-GF.Based on the interfacial engineering,the side reactions were effectively mitigated and crystal planes were regulated through KL-GF.The hydrophilicity of KL alleviated the corrosion and hydrogen evolution.Importantly,a preferential orientation of Zn(002)crystal plane by KL-GF was induced to further realize dendrite-free deposition by density functional theory(DFT)and X-ray diffraction(XRD)characterization.Hence,the Zn|KL-GF|MnO_(2)cell maintained a high discharge capacity of 96.8 mAh/g at 2 A/g after 1000 cycles.This work can provide guidance enabling high-performance zinc anode for AZIBs.展开更多
Ultrahigh dose-rate(FLASH)radiotherapy is an emerging technology with excellent therapeutic effects and low biological toxicity.However,tumor recurrence largely impede the effectiveness of FLASH therapy.Overcoming tum...Ultrahigh dose-rate(FLASH)radiotherapy is an emerging technology with excellent therapeutic effects and low biological toxicity.However,tumor recurrence largely impede the effectiveness of FLASH therapy.Overcoming tumor recurrence is crucial for practical FLASH applications.Here,we prepared an agarose-based thermosensitive hydrogel containing a mild photothermal agent(TPE-BBT)and a glutaminase inhibitor(CB-839).Within nanoparticles,TPE-BBT exhibits aggregation-induced emission peaked at 900 nm,while the unrestricted molecular motions endow TPE-BBT with a mild photothermy generation ability.The balanced photothermal effect and photoluminescence are ideal for phototheranostics.Upon 660-nm laser irradiation,the temperature-rising effect softens and hydrolyzes the hydrogel to release TPE-BBT and CB-839 into the tumor site for concurrent mild photothermal therapy and chemotherapy,jointly inhibiting homologous recombination repair of DNA.The enhanced FLASH radiotherapy efficiently kills the tumor tissue without recurrence and obvious systematic toxicity.This work deciphers the unrestricted molecular motions in bright organic fluorophores as a source of photothermy,and provides novel recurrence-resistant radiotherapy without adverse side effects.展开更多
Histamine is a neurotransmitter and neuromodulator in the central nervous system,which plays its function through binding with diferent histamine receptors,such as H_(1)receptor(H_(1)R),H_(2)receptor(H_(2)R),H_(3)rece...Histamine is a neurotransmitter and neuromodulator in the central nervous system,which plays its function through binding with diferent histamine receptors,such as H_(1)receptor(H_(1)R),H_(2)receptor(H_(2)R),H_(3)receptor(H_(3)R),and H_(4)receptor(H_(4)R)[1,2].Although both H_(1)R and H_(2)R,as post-synaptic receptors,are expressed in most brain areas,they captured different attention from scientists.H,R is well stud-ied and believed to play critical roles in many physiological and pathological processes,including sleep and wakefulness.展开更多
The COVID-19 pandemic poses unprecedented challenges around the world.Many studies have applied mobility data to explore spatiotemporal trends over time,investigate associations with other variables,and predict or sim...The COVID-19 pandemic poses unprecedented challenges around the world.Many studies have applied mobility data to explore spatiotemporal trends over time,investigate associations with other variables,and predict or simulate the spread of COVID-19.Our objective was to provide a comprehensive overview of human mobility open data to guide researchers and policymakers in conducting data-driven evaluations and decision-making for the COVID-19 pandemic and other infectious disease outbreaks.We summarized the mobility data usage in COVID-19 studies by reviewing recent publications on COVID-19 and human mobility from a data-oriented perspective.We identified three major sources of mobility data:public transit systems,mobile operators,and mobile phone applications.Four approaches have been commonly used to estimate human mobility:public transit-based flow,social activity patterns,index-based mobility data,and social media-derived mobility data.We compared mobility datasets’characteristics by assessing data privacy,quality,space–time coverage,high-performance data storage and processing,and accessibility.We also present challenges and future directions of using mobility data.This review makes a pivotal contribution to understanding the use of and access to human mobility data in the COVID-19 pandemic and future disease outbreaks.展开更多
In the big data era,robust solutions are obliged to be proposed to integrate and represent data from different formats and with different contents to assist the decision-making.Current cartographic and geographic info...In the big data era,robust solutions are obliged to be proposed to integrate and represent data from different formats and with different contents to assist the decision-making.Current cartographic and geographic information systems have limited capabilities for solving these problems.This paper describes an automatic and comprehensive system that conducts data fusion from all potentially related sources.In this system,a new Semantic Location Model(SemLM)is established to present the semantic concepts and location feature and demonstrate how locations are interrelated.In the SemLM,various types of location descriptors in different application scenarios can be analyzed and understood.Additionally,considering the challenges involved in data-intensive computation and visualization,this paper implements a Place-based Pan-Information System(P2S)as an innovative 4D system that dynamically associates and visualizes place-based information,using public security as the case study.展开更多
Bioimaging and biosensing in the second nearinfrared(NIR-II)window have attracted great attention due to their unprecedented high temporal–spatial resolution,sensitivity,and penetration depth.Although some organic fl...Bioimaging and biosensing in the second nearinfrared(NIR-II)window have attracted great attention due to their unprecedented high temporal–spatial resolution,sensitivity,and penetration depth.Although some organic fluorescence dyes have been developed in this window,it is still a great challenge to synthesize hydrophilic organic contrast agents with both absorbance and emission wavelengths beyond 1300 nm.J-aggregation is a facile pathway to achieve the wavelength red-shift of organic dyes to the NIR-II window and simultaneously improve their hydrophilicity.Here,we report FD-1080 J-aggregates(FD-J)with absorbance of 1360 nm and emission of 1370 nm through heating H-aggregated FD-1080 cyanine dyes in an aqueous solution.With FD-J administration,real-time imaging of mice brain and hindlimb vasculatures can be performed beyond 1500 nm.Meanwhile,arterial and venous vessels can be clearly distinguished through dynamic imaging after injection of FD-J.In addition,reactive oxygen species-responsive NIR-II ratiometric fluorescence sensors were available based on FD-J and lanthanide nanoparticles to enable the detection of inflammation in living mice.展开更多
Geoportals have been the primary source of spatial information to researchers in diverse fields.Recent years have seen a growing trend to integrate spatial analysis and geovisual analytics inside Geoportals.Researcher...Geoportals have been the primary source of spatial information to researchers in diverse fields.Recent years have seen a growing trend to integrate spatial analysis and geovisual analytics inside Geoportals.Researchers could use the Geoportal to conduct basic analysis without offline processing.In practice,domain-specific analysis often requires researchers to integrate heterogeneous data sources,leverage new statistical models,or build their own customized models.These tasks are increasingly being tackled with open source tools in programming languages such as Python or R.However,it is unrealistic to incorporate the numerous open source tools in a Geoportal platform for data processing and analysis.This work provides an exploratory effort to bridge Geoportals and open source tools through Python scripting.The Geoportal demonstrated in this work is the Urban and Regional Explorer for China studies.A python package is provided to manipulate this platform in the local programming environment.The server side of the Geoportal implements a set of service endpoints that allows the package to upload,transform,and process user data and seamlessly integrate them into the existing datasets.A case study is provided that illustrated the use of this package to conduct integrated analyses of search engine data and baseline census data.This work attempts a new direction in Geoportal development,which could further promote the transformation of Geoportals into online analytical workbenches.展开更多
There is a critical need to develop a means for fast,task-driven discovery of geospatial data found in geoportals.Existing geoportals,however,only provide metadata-based means for discovery,with little support for tas...There is a critical need to develop a means for fast,task-driven discovery of geospatial data found in geoportals.Existing geoportals,however,only provide metadata-based means for discovery,with little support for task-driven discovery,especially when considering spatial–temporal awareness.To address this gap,this paper presents a Case-Based Reasoning-supported Geospatial Data Discovery(CBR-GDD)method and implementation that accesses geospatial data by tasks.The advantages of the CBR-GDD approach is that it builds an analogue reasoning process that provides an internal mechanism bridging tasks and geospatial data with spatial–temporal awareness,thus providing solutions based on past tasks.The CBR-GDD approach includes a set of algorithms that were successfully implemented via three components as an extension of geoportals:ontology-enhanced knowledge base,similarity assessment model,and case retrieval nets.A set of experiments and case studies validate the CBR-GDD approach and application,and demonstrate its efficiency.展开更多
基金financially supported by National Natural Science Foundation of China(Nos.51872090,51772097,52372252)Hebei Natural Science Fund for Distinguished Young Scholar(No.E2019209433)+1 种基金Youth Talent Program of Hebei Provincial Education Department(No.BJ2018020)Natural Science Foundation of Hebei Province(No.E2020209151)。
文摘Achieving a highly robust zinc(Zn)metal anode is extremely important for improving the performance of aqueous Zn-ion batteries(AZIBs)for advancing“carbon neutrality”society,which is hampered by the uncontrollable growth of Zn dendrite and severe side reactions including hydrogen evolution reaction,corrosion,and passivation,etc.Herein,an interlayer containing fluorinated zincophilic covalent organic framework with sulfonic acid groups(COF-S-F)is developed on Zn metal(Zn@COF-S-F)as the artificial solid electrolyte interface(SEI).Sulfonic acid group(-SO_(3)H)in COF-S-F can effectively ameliorate the desolvation process of hydrated Zn ions,and the three-dimensional channel with fluoride group(-F)can provide interconnected channels for the favorable transport of Zn ions with ion-confinement effects,endowing Zn@COF-S-F with dendrite-free morphology and suppressed side reactions.Consequently,Zn@COF-S-F symmetric cell can stably cycle for 1,000 h with low average hysteresis voltage(50.5 m V)at the current density of 1.5 m A cm^(-2).Zn@COF-S-F|Mn O_(2)cell delivers the discharge specific capacity of 206.8 m Ah g^(-1)at the current density of 1.2 A g^(-1)after 800 cycles with high-capacity retention(87.9%).Enlightening,building artificial SEI on metallic Zn surface with targeted design has been proved as the effective strategy to foster the practical application of high-performance AZIBs.
基金financially supported by National Natural Science Foundation of China(No.51872090,51772097)Hebei Natural Science Fund for Distinguished Young Scholar(No.E2019209433)+2 种基金Youth Talent Program of Hebei Provincial Education Department(No.BJ2018020)Natural Science Foundation of Hebei Province(No.E2020209151)the financial support from Donghua University(101-08-0241022,23D210105,and 101-07-005759)。
文摘Aqueous zinc-ion batteries(AZIBs) hold great promise as a viable alternative to lithium-ion batteries owing to their high energy density and environmental friendliness.However,AZIBs are consistently plagued by the formation of zinc dendrites and concurrent side reactions,which significantly diminish their overall service life,In this study,the glass fiber separator(GF) is modified using zeolite imidazole salt framework-8(ZIF-8),enabling the development of efficient AZIBs.ZIF-8,which is abundant in nitrogen content,efficiently regulates the desolvation of [Zn(H_(2)O)_(6)]^(2+) to inhibit hydrogen production.Moreover,it possesses abundant nanochannels that facilitate the uniform deposition of Zn~(2+) via a localized action,thereby hindering the formation of dendrites.The insulating properties of ZIF-8 help prevent Zn^(2+) and water from trapping electron reduction at the layer surface,which reduces corrosion of the zinc anode.Consequently,ZIF-8-GF achieves the even transport of Zn^(2+) and regulates the homogeneous deposition along the Zn(002) crystal surface,thus significantly enhancing the electrochemical performance of the AZIBs,In particular,the Zn|Zn symmetric cell with the ZIF-8-GF separator delivers a stable cycle life at0.5 mA cm^(-2) of 2300 h.The Zn|ZIF-8-GF|MnO_(2) cell exhibits reduced voltage polarization while maintaining a capacity retention rate(93.4%) after 1200 cycles at 1.2 A g^(-1) The unique design of the modified diaphragm provides a new approach to realizing high-performance AZIBs.
基金supported by the National Natural Science Foundation of China(Nos.51872090,51772097,82204604)the Hebei Natural Science Fund for Distinguished Young Scholar(No.E2019209433)+1 种基金the Youth Talent Program of Hebei Provincial Education Department(No.BJ2018020)the Natural Science Foundation of Hebei Province(Nos.E2020209151,E2022209158,H2022209012)。
文摘Aqueous zinc ion batteries(AZIBs)are promising energy storage devices.However,the formation of dendrites,hydrogen evolution,and corrosion reaction seriously affect their electrochemical performance.Herein,the synergistic effect of ion-migration regulation and interfacial engineering has been confirmed as the potential strategy by kaolin functionalized glass fiber separator(KL-GF)to alleviate these problems.The rapid and orderly Zn^(2+)migration was achieved to improve the transfer kinetics and induced uniform zinc deposition by more zinc-philic sites of KL-GF.Based on the interfacial engineering,the side reactions were effectively mitigated and crystal planes were regulated through KL-GF.The hydrophilicity of KL alleviated the corrosion and hydrogen evolution.Importantly,a preferential orientation of Zn(002)crystal plane by KL-GF was induced to further realize dendrite-free deposition by density functional theory(DFT)and X-ray diffraction(XRD)characterization.Hence,the Zn|KL-GF|MnO_(2)cell maintained a high discharge capacity of 96.8 mAh/g at 2 A/g after 1000 cycles.This work can provide guidance enabling high-performance zinc anode for AZIBs.
基金supported by the National Natural Science Foundation of China (21788102 and 82303797)the Research Grants Council of Hong Kong (16306620,16303221,N_HKUST609/19,and C6014-20W)+4 种基金the Research Grants Council of the Hong Kong Special Administrative Region,China (HKUST PDFS2324-6S01)the Innovation and Technology Commission (ITC-CNERC14SC01 and ITCPD/17-9)the Science Technology Innovation Commission of Shenzhen Municipality (KQTD20210811090142053 and GJHZ20210705141810031)the Science and Technology Plan of Shenzhen (JCYJ20200109110608167 and JCYJ20220818103007014)the Guangxi Natural Science Foundation (2023GXNSFBA026137).
文摘Ultrahigh dose-rate(FLASH)radiotherapy is an emerging technology with excellent therapeutic effects and low biological toxicity.However,tumor recurrence largely impede the effectiveness of FLASH therapy.Overcoming tumor recurrence is crucial for practical FLASH applications.Here,we prepared an agarose-based thermosensitive hydrogel containing a mild photothermal agent(TPE-BBT)and a glutaminase inhibitor(CB-839).Within nanoparticles,TPE-BBT exhibits aggregation-induced emission peaked at 900 nm,while the unrestricted molecular motions endow TPE-BBT with a mild photothermy generation ability.The balanced photothermal effect and photoluminescence are ideal for phototheranostics.Upon 660-nm laser irradiation,the temperature-rising effect softens and hydrolyzes the hydrogel to release TPE-BBT and CB-839 into the tumor site for concurrent mild photothermal therapy and chemotherapy,jointly inhibiting homologous recombination repair of DNA.The enhanced FLASH radiotherapy efficiently kills the tumor tissue without recurrence and obvious systematic toxicity.This work deciphers the unrestricted molecular motions in bright organic fluorophores as a source of photothermy,and provides novel recurrence-resistant radiotherapy without adverse side effects.
文摘Histamine is a neurotransmitter and neuromodulator in the central nervous system,which plays its function through binding with diferent histamine receptors,such as H_(1)receptor(H_(1)R),H_(2)receptor(H_(2)R),H_(3)receptor(H_(3)R),and H_(4)receptor(H_(4)R)[1,2].Although both H_(1)R and H_(2)R,as post-synaptic receptors,are expressed in most brain areas,they captured different attention from scientists.H,R is well stud-ied and believed to play critical roles in many physiological and pathological processes,including sleep and wakefulness.
基金supported by the NSF[National Science Foundation]under grant 1841403,2027540,and 2028791.
文摘The COVID-19 pandemic poses unprecedented challenges around the world.Many studies have applied mobility data to explore spatiotemporal trends over time,investigate associations with other variables,and predict or simulate the spread of COVID-19.Our objective was to provide a comprehensive overview of human mobility open data to guide researchers and policymakers in conducting data-driven evaluations and decision-making for the COVID-19 pandemic and other infectious disease outbreaks.We summarized the mobility data usage in COVID-19 studies by reviewing recent publications on COVID-19 and human mobility from a data-oriented perspective.We identified three major sources of mobility data:public transit systems,mobile operators,and mobile phone applications.Four approaches have been commonly used to estimate human mobility:public transit-based flow,social activity patterns,index-based mobility data,and social media-derived mobility data.We compared mobility datasets’characteristics by assessing data privacy,quality,space–time coverage,high-performance data storage and processing,and accessibility.We also present challenges and future directions of using mobility data.This review makes a pivotal contribution to understanding the use of and access to human mobility data in the COVID-19 pandemic and future disease outbreaks.
基金This work is supported by the National Natural Science Foundation of China(grant number 41301517,41271401,41329001,41401524,1416509,and 1535031)the National Key Research and Development Program(grant number 2016YFB0502204)+3 种基金the Fundamental Research Funds for the Central Universities(grant number 413000010)National Science and Technology Support Plan,the National Key Technology R&D Program(grant number 2012BAH35B03)Guangxi Natural Science Foundation(grant number 2015GXNSFBA139191)Scientific Project of Guangxi Education Department(grant number KY2015YB189).
文摘In the big data era,robust solutions are obliged to be proposed to integrate and represent data from different formats and with different contents to assist the decision-making.Current cartographic and geographic information systems have limited capabilities for solving these problems.This paper describes an automatic and comprehensive system that conducts data fusion from all potentially related sources.In this system,a new Semantic Location Model(SemLM)is established to present the semantic concepts and location feature and demonstrate how locations are interrelated.In the SemLM,various types of location descriptors in different application scenarios can be analyzed and understood.Additionally,considering the challenges involved in data-intensive computation and visualization,this paper implements a Place-based Pan-Information System(P2S)as an innovative 4D system that dynamically associates and visualizes place-based information,using public security as the case study.
基金supported by the National Key R&D Program of China(no.2017YFA0207303)National Natural Science Foundation of China(NSFC,nos.22088101,21725502,51961145403,and 22004018)Key Basic Research Program of Science and Technology Commission of Shanghai Municipality(nos.20JC1411700,19490713100,20490710600,and 20S3190370)。
文摘Bioimaging and biosensing in the second nearinfrared(NIR-II)window have attracted great attention due to their unprecedented high temporal–spatial resolution,sensitivity,and penetration depth.Although some organic fluorescence dyes have been developed in this window,it is still a great challenge to synthesize hydrophilic organic contrast agents with both absorbance and emission wavelengths beyond 1300 nm.J-aggregation is a facile pathway to achieve the wavelength red-shift of organic dyes to the NIR-II window and simultaneously improve their hydrophilicity.Here,we report FD-1080 J-aggregates(FD-J)with absorbance of 1360 nm and emission of 1370 nm through heating H-aggregated FD-1080 cyanine dyes in an aqueous solution.With FD-J administration,real-time imaging of mice brain and hindlimb vasculatures can be performed beyond 1500 nm.Meanwhile,arterial and venous vessels can be clearly distinguished through dynamic imaging after injection of FD-J.In addition,reactive oxygen species-responsive NIR-II ratiometric fluorescence sensors were available based on FD-J and lanthanide nanoparticles to enable the detection of inflammation in living mice.
文摘Geoportals have been the primary source of spatial information to researchers in diverse fields.Recent years have seen a growing trend to integrate spatial analysis and geovisual analytics inside Geoportals.Researchers could use the Geoportal to conduct basic analysis without offline processing.In practice,domain-specific analysis often requires researchers to integrate heterogeneous data sources,leverage new statistical models,or build their own customized models.These tasks are increasingly being tackled with open source tools in programming languages such as Python or R.However,it is unrealistic to incorporate the numerous open source tools in a Geoportal platform for data processing and analysis.This work provides an exploratory effort to bridge Geoportals and open source tools through Python scripting.The Geoportal demonstrated in this work is the Urban and Regional Explorer for China studies.A python package is provided to manipulate this platform in the local programming environment.The server side of the Geoportal implements a set of service endpoints that allows the package to upload,transform,and process user data and seamlessly integrate them into the existing datasets.A case study is provided that illustrated the use of this package to conduct integrated analyses of search engine data and baseline census data.This work attempts a new direction in Geoportal development,which could further promote the transformation of Geoportals into online analytical workbenches.
基金supported by the National Key Research and Development Program of China[grant number 2016YFB0502204]Opening research fund of State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing[grant number(16)Key04]+1 种基金Opening fund of Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation(Guangxi Teachers Education University)[grant number 2015GXESPKF02]National Natural Science Foundation of China[grant number 41401524].
文摘There is a critical need to develop a means for fast,task-driven discovery of geospatial data found in geoportals.Existing geoportals,however,only provide metadata-based means for discovery,with little support for task-driven discovery,especially when considering spatial–temporal awareness.To address this gap,this paper presents a Case-Based Reasoning-supported Geospatial Data Discovery(CBR-GDD)method and implementation that accesses geospatial data by tasks.The advantages of the CBR-GDD approach is that it builds an analogue reasoning process that provides an internal mechanism bridging tasks and geospatial data with spatial–temporal awareness,thus providing solutions based on past tasks.The CBR-GDD approach includes a set of algorithms that were successfully implemented via three components as an extension of geoportals:ontology-enhanced knowledge base,similarity assessment model,and case retrieval nets.A set of experiments and case studies validate the CBR-GDD approach and application,and demonstrate its efficiency.
