An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, clo...An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.展开更多
This paper discusses the challenges in operational crisis management and describes the role of information and geo-spatial technologies in meeting those challenges.The paper discusses two main sources of data,Web and ...This paper discusses the challenges in operational crisis management and describes the role of information and geo-spatial technologies in meeting those challenges.The paper discusses two main sources of data,Web and very high resolution(VHR)earth observation sensors,in terms of relevance to crisis management and techniques for information extraction and analysis.Although research in information text extraction and analysis is more advanced than in information image extraction and analysis,further research is required in both these fields to take advantage of the increasing complexity but richness of open source and VHR satellite data.The paper also discusses the use of Web,GIS and Digital Earth technologies in facilitating collaborative work,decision-making and information sharing in crisis management.Despite exciting and relevant advances in information sources,information extraction and analysis methods,and collaborative crisis technologies,the main challenge remains to convince stakeholders in operational crisis management that the adoption of these technologies will lead to enhanced and effective crisis management.展开更多
Perfluoroalkyl acids(PFAAs)are emerging organic pollutants that have attracted significant attention in the fields of environmental chemistry and toxicology.Although PFAAs are pervasive in soils and sediments,there is...Perfluoroalkyl acids(PFAAs)are emerging organic pollutants that have attracted significant attention in the fields of environmental chemistry and toxicology.Although PFAAs are pervasive in soils and sediments,there is a paucity of research regarding their environmental forms and driving mechanisms.This review provides an overview of the classification and biotoxicity of per-and polyfluoroalkyl substances(PFAS),organic pollutant forms,PFAS extraction and analytical methods,the prediction of PFAS distribution in soils,and current PFAS remediation strategies.Four predominant PFAA forms have been proposed in soils:(i)aqueous-extracted PFAAs,(ii)organic-solvent extracted PFAAs,(ii)embedded or sequestered PFAAs,and(iv)covalently bound PFAAs.Furthermore,it suggests suitable extraction methods and predictive models for different PFAA forms,which are instrumental in the research on PFAA speciation and prediction in soils.Simultaneously,it was proposed that elemental cycling and microbial activity may affect the speciation of PFAs.Additionally,the categorization of PFAA forms facilitated the analysis of pollution remediation.Understanding the interplay between PFAA speciation,element cycling,and bacterial activity during soil remediation is essential for understanding remediation mechanisms and assessing the long-term stability of remediation methods.Future studies should expand the investigation of varying PFAA forms in different media,consider the potential binding forms of PFAAs to minerals,organic matter,and microbes,and evaluate the possible mechanisms of PFAA speciation variation.展开更多
基金Project(51274250)supported by the National Natural Science Foundation of ChinaProject(2012BAK09B02-05)supported by the National Key Technology R&D Program during the 12th Five-year Plan of China
文摘An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.
文摘This paper discusses the challenges in operational crisis management and describes the role of information and geo-spatial technologies in meeting those challenges.The paper discusses two main sources of data,Web and very high resolution(VHR)earth observation sensors,in terms of relevance to crisis management and techniques for information extraction and analysis.Although research in information text extraction and analysis is more advanced than in information image extraction and analysis,further research is required in both these fields to take advantage of the increasing complexity but richness of open source and VHR satellite data.The paper also discusses the use of Web,GIS and Digital Earth technologies in facilitating collaborative work,decision-making and information sharing in crisis management.Despite exciting and relevant advances in information sources,information extraction and analysis methods,and collaborative crisis technologies,the main challenge remains to convince stakeholders in operational crisis management that the adoption of these technologies will lead to enhanced and effective crisis management.
基金supported by the Guangdong Major Project of Basic and Applied Basic Research (No.2023B0303000006)National Natural Science Foundation of China (Nos.42125704,42261160644,42277479,and 42077307)+2 种基金the Guangzhou Basic and Applied Basic Research Foundation (No.2023A04J0931)the GDAS'Project of Science and Technology Developmen (Nos.2023GDASZH-2023010103,2022GDASZH-2022010201-04,2022GDASZH-2022010105 and 2019GDASYL-0102002-2)Guangdong Foundation for Program of Science and Technology Research (No.2023B1212060044)。
文摘Perfluoroalkyl acids(PFAAs)are emerging organic pollutants that have attracted significant attention in the fields of environmental chemistry and toxicology.Although PFAAs are pervasive in soils and sediments,there is a paucity of research regarding their environmental forms and driving mechanisms.This review provides an overview of the classification and biotoxicity of per-and polyfluoroalkyl substances(PFAS),organic pollutant forms,PFAS extraction and analytical methods,the prediction of PFAS distribution in soils,and current PFAS remediation strategies.Four predominant PFAA forms have been proposed in soils:(i)aqueous-extracted PFAAs,(ii)organic-solvent extracted PFAAs,(ii)embedded or sequestered PFAAs,and(iv)covalently bound PFAAs.Furthermore,it suggests suitable extraction methods and predictive models for different PFAA forms,which are instrumental in the research on PFAA speciation and prediction in soils.Simultaneously,it was proposed that elemental cycling and microbial activity may affect the speciation of PFAs.Additionally,the categorization of PFAA forms facilitated the analysis of pollution remediation.Understanding the interplay between PFAA speciation,element cycling,and bacterial activity during soil remediation is essential for understanding remediation mechanisms and assessing the long-term stability of remediation methods.Future studies should expand the investigation of varying PFAA forms in different media,consider the potential binding forms of PFAAs to minerals,organic matter,and microbes,and evaluate the possible mechanisms of PFAA speciation variation.
