Per-and poly-fluoroalkyl substances(PFAS)have garnered significant global attention due to their widespread presence and potential environmental and health risks.However,research on the occurrence and environmental be...Per-and poly-fluoroalkyl substances(PFAS)have garnered significant global attention due to their widespread presence and potential environmental and health risks.However,research on the occurrence and environmental behavior of PFAS across different media remains limited.We analyzed the occurrence,distribution,sources,and ecological risks of 32 PFAS across multiple media in the Weihe River,China.The concentrations of PFAS ranged from 5.89 to 472.84 ng/L in the pore water and from 9.93 to 459.50 ng/L in surface water,exhibiting significant spatial variability(P<0.05).In contrast,the PFAS concentration range in the sediments was 0.74-1.81 ng/g dry weight,with no pronounced spatial variation in solid-phase PFAS(P>0.05).Vertically,concentrations in 33.00%of pore water samples exceeded those in surface water,showing a heterogeneous vertical distribution with enrichment at depths of 40-60 cm.The physical-chemical characteristics of PFAS and the hydrological and sedimentary processes at the basin scale were responsible for PFAS partitioning between the aquatic environment and sediments.Four major sources were identified through integrated source apportionment:industrial and domestic wastewater(58.25%),aqueous film-forming foam(18.07%),combined input from household pollution and metal plating(8.70%),and stormwater runoff and landfill leachate(14.98%).The ecological risk assessment revealed negligible risks from short-chain PFAS in surface water and pore water,whereas long-chain PFAS posed low to moderate ecological risks.Furthermore,the discharge of PFAS from the Weihe River to the Yellow River was estimated up to 708.20 kg/a.This study provides critical data informing strategies for mitigating PFAS pollution in rivers across typical arid and semi-arid areas of China.展开更多
【目的】本研究旨在系统解析多源大数据驱动的生态系统文化服务(cultural ecosystem service,CES)评估创新,明晰研究进展与未来方向。【方法】以“生态系统文化服务”和“价值评估”为关键词,检索Web of Science与CNKI数据库2000—2024...【目的】本研究旨在系统解析多源大数据驱动的生态系统文化服务(cultural ecosystem service,CES)评估创新,明晰研究进展与未来方向。【方法】以“生态系统文化服务”和“价值评估”为关键词,检索Web of Science与CNKI数据库2000—2024年的文献。从大数据类型、CES价值类型、评估对象与评估方法4个维度梳理研究成果,对当前研究机遇、挑战及未来趋势进行系统性评述,并系统性总结基于多源大数据的CES评估工作流。【结果】1)CES评估范式呈现从传统经济核算向智能评估转型的趋势。统计表明,约70%的研究通过多源数据的应用实现了范式革新,主要体现在CES价值类型维度拓展、评估对象类型细化、评估方法应用创新3个方面。2)大数据应用突破了传统信息获取瓶颈,形成政府公开数据(生态环境数据、人口经济数据等)与用户生成数据(社交媒体数据、地图与兴趣点数据、位置服务数据等)融合的多元化格局,显著提升了CES价值解析的精度、时空覆盖度及场景适用性。3)机器学习、深度学习等人工智能技术与大数据分析手段成为新兴的CES评估方法,能进行海量数据处理与深度信息挖掘,有效提升了评估效率与准确性。【结论】多源大数据的应用使得CES评估从传统经济核算转向智能感知分析,为CES研究提供了新依据。未来需推动评估框架的标准化,以提升研究结果的科学性和解释力。展开更多
In English teachinig,the use of multi-media makes a vivid learning atmosphere for students.It can get a better teaching effect in all-around education.Meanwhile,thereare some problems inevitably in this field,leaving ...In English teachinig,the use of multi-media makes a vivid learning atmosphere for students.It can get a better teaching effect in all-around education.Meanwhile,thereare some problems inevitably in this field,leaving for the English teachers to solve.展开更多
Not only does the multi-media technology in teaching help students arouse curiosity and draw their attention,but also it makes students enhance their language skills and master knowledge.It makes English teaching smooth.
The method of principal component analysis was applied to systematical research on the soil multi-media environment, including soil, surface water, ground water, waterbody sediment and agricultural crops, as well as p...The method of principal component analysis was applied to systematical research on the soil multi-media environment, including soil, surface water, ground water, waterbody sediment and agricultural crops, as well as pollution-inducing wastewater, mullock (or waste ore) and slag in the periphery of a large-sized Pb-Zn mining and smelting plant in a karst area of Guangxi Zhuang Autonomous Region. The results revealed that soils in the area studied have been heavily polluted by Cd, Zn, Pb and Hg, and the levels of these metals in the samples of agricultural crop greatly exceed the standards. The above-mentioned pollutants exist in all soil-multi-media environments. The mullock, slag, wastewater, surface water, ground water, soil, and agricultural crops constitute a composite ecological chain. Therefore, the improper disposal of mullock and slag, and the use of polluted wastewater for agricultural irrigation are the main causes of soil pollution. Heavy metals in the soil have three transition progresses: point (improved soil with slag, ground water inflow plot), linear (river transition) and non-point transition (regional pollution by slag) patterns, and the tailing yard is the most important locus for heavy metals to release into the environment.展开更多
The multi-media teaching method refers to using computer as a teaching assistant in the teaching Chinese as the second language （TCSL） class. The purpose of employing multi-media technology is to encourage students...The multi-media teaching method refers to using computer as a teaching assistant in the teaching Chinese as the second language （TCSL） class. The purpose of employing multi-media technology is to encourage students＇ class participation, giving them explicit and specific impression of abstract contents and cultivating their intuitive grasp of linguistic points. Based on the current study of usage of multi-media technology in class teaching, this paper attempts to investigate mainly on its positive influence of multi-media technology in teaching.展开更多
This paper discusses the strengths of using the intemet and building corpus in interpretation teaching. The authors propose multi-media assisted interpretation teaching strategies such as building a small -sized contr...This paper discusses the strengths of using the intemet and building corpus in interpretation teaching. The authors propose multi-media assisted interpretation teaching strategies such as building a small -sized controlled internal interpretation corpus, encouraging students to search information via the internet, and conducting teacher-student, student-student communication at all levels via E-mall, BBS, skype-in-English, audio/video conference and etc.展开更多
With theoretical research method and literature research method, the application of modem multi-media technology to Physical Education （PE） and the existing weaknesses are analyzed in this paper by comparing the mod...With theoretical research method and literature research method, the application of modem multi-media technology to Physical Education （PE） and the existing weaknesses are analyzed in this paper by comparing the modem and traditional PE modes. The modem multi-media technology features the integration of the audio and video technologies and the simultaneous use of eyes and hands, embodies the inherent inspiration for its simulation, feedback, games, etc., and emanates enormous appeal. Its dynamic integration with physical education brings about a brand-new education approach in the history of physical education reformation. It has been involving to be an important education approach for PE teachers. Nevertheless, there are still a lot of key and difficult points that are not easy for the students to grasp regarding the application of modem multi-media technology to the physical education; and the teachers are weak in this new education approach and their course preparations are of low quality. Therefore, more attention needs to be paid to the integration of the advantages of multi-media teaching and the peculiarities of physical education so that multi-media technology can be made the best use in physical education.展开更多
基金supported by the National Natural Science Foundation of China(42230513)the Research Project on Ecological Protection and High-Quality Development in the Yellow River Basin,China(2022-YRUC-01-0101)the Natural Science Basic Research Plan in Shaanxi Province,China(2022JC-LHJJ-11).
文摘Per-and poly-fluoroalkyl substances(PFAS)have garnered significant global attention due to their widespread presence and potential environmental and health risks.However,research on the occurrence and environmental behavior of PFAS across different media remains limited.We analyzed the occurrence,distribution,sources,and ecological risks of 32 PFAS across multiple media in the Weihe River,China.The concentrations of PFAS ranged from 5.89 to 472.84 ng/L in the pore water and from 9.93 to 459.50 ng/L in surface water,exhibiting significant spatial variability(P<0.05).In contrast,the PFAS concentration range in the sediments was 0.74-1.81 ng/g dry weight,with no pronounced spatial variation in solid-phase PFAS(P>0.05).Vertically,concentrations in 33.00%of pore water samples exceeded those in surface water,showing a heterogeneous vertical distribution with enrichment at depths of 40-60 cm.The physical-chemical characteristics of PFAS and the hydrological and sedimentary processes at the basin scale were responsible for PFAS partitioning between the aquatic environment and sediments.Four major sources were identified through integrated source apportionment:industrial and domestic wastewater(58.25%),aqueous film-forming foam(18.07%),combined input from household pollution and metal plating(8.70%),and stormwater runoff and landfill leachate(14.98%).The ecological risk assessment revealed negligible risks from short-chain PFAS in surface water and pore water,whereas long-chain PFAS posed low to moderate ecological risks.Furthermore,the discharge of PFAS from the Weihe River to the Yellow River was estimated up to 708.20 kg/a.This study provides critical data informing strategies for mitigating PFAS pollution in rivers across typical arid and semi-arid areas of China.
文摘【目的】本研究旨在系统解析多源大数据驱动的生态系统文化服务(cultural ecosystem service,CES)评估创新,明晰研究进展与未来方向。【方法】以“生态系统文化服务”和“价值评估”为关键词,检索Web of Science与CNKI数据库2000—2024年的文献。从大数据类型、CES价值类型、评估对象与评估方法4个维度梳理研究成果,对当前研究机遇、挑战及未来趋势进行系统性评述,并系统性总结基于多源大数据的CES评估工作流。【结果】1)CES评估范式呈现从传统经济核算向智能评估转型的趋势。统计表明,约70%的研究通过多源数据的应用实现了范式革新,主要体现在CES价值类型维度拓展、评估对象类型细化、评估方法应用创新3个方面。2)大数据应用突破了传统信息获取瓶颈,形成政府公开数据(生态环境数据、人口经济数据等)与用户生成数据(社交媒体数据、地图与兴趣点数据、位置服务数据等)融合的多元化格局,显著提升了CES价值解析的精度、时空覆盖度及场景适用性。3)机器学习、深度学习等人工智能技术与大数据分析手段成为新兴的CES评估方法,能进行海量数据处理与深度信息挖掘,有效提升了评估效率与准确性。【结论】多源大数据的应用使得CES评估从传统经济核算转向智能感知分析,为CES研究提供了新依据。未来需推动评估框架的标准化,以提升研究结果的科学性和解释力。
文摘In English teachinig,the use of multi-media makes a vivid learning atmosphere for students.It can get a better teaching effect in all-around education.Meanwhile,thereare some problems inevitably in this field,leaving for the English teachers to solve.
文摘Not only does the multi-media technology in teaching help students arouse curiosity and draw their attention,but also it makes students enhance their language skills and master knowledge.It makes English teaching smooth.
基金support by Guangxi Scientific and Technological Brainstorm Project (Guikegong 0779011)
文摘The method of principal component analysis was applied to systematical research on the soil multi-media environment, including soil, surface water, ground water, waterbody sediment and agricultural crops, as well as pollution-inducing wastewater, mullock (or waste ore) and slag in the periphery of a large-sized Pb-Zn mining and smelting plant in a karst area of Guangxi Zhuang Autonomous Region. The results revealed that soils in the area studied have been heavily polluted by Cd, Zn, Pb and Hg, and the levels of these metals in the samples of agricultural crop greatly exceed the standards. The above-mentioned pollutants exist in all soil-multi-media environments. The mullock, slag, wastewater, surface water, ground water, soil, and agricultural crops constitute a composite ecological chain. Therefore, the improper disposal of mullock and slag, and the use of polluted wastewater for agricultural irrigation are the main causes of soil pollution. Heavy metals in the soil have three transition progresses: point (improved soil with slag, ground water inflow plot), linear (river transition) and non-point transition (regional pollution by slag) patterns, and the tailing yard is the most important locus for heavy metals to release into the environment.
文摘The multi-media teaching method refers to using computer as a teaching assistant in the teaching Chinese as the second language （TCSL） class. The purpose of employing multi-media technology is to encourage students＇ class participation, giving them explicit and specific impression of abstract contents and cultivating their intuitive grasp of linguistic points. Based on the current study of usage of multi-media technology in class teaching, this paper attempts to investigate mainly on its positive influence of multi-media technology in teaching.
文摘This paper discusses the strengths of using the intemet and building corpus in interpretation teaching. The authors propose multi-media assisted interpretation teaching strategies such as building a small -sized controlled internal interpretation corpus, encouraging students to search information via the internet, and conducting teacher-student, student-student communication at all levels via E-mall, BBS, skype-in-English, audio/video conference and etc.
文摘With theoretical research method and literature research method, the application of modem multi-media technology to Physical Education （PE） and the existing weaknesses are analyzed in this paper by comparing the modem and traditional PE modes. The modem multi-media technology features the integration of the audio and video technologies and the simultaneous use of eyes and hands, embodies the inherent inspiration for its simulation, feedback, games, etc., and emanates enormous appeal. Its dynamic integration with physical education brings about a brand-new education approach in the history of physical education reformation. It has been involving to be an important education approach for PE teachers. Nevertheless, there are still a lot of key and difficult points that are not easy for the students to grasp regarding the application of modem multi-media technology to the physical education; and the teachers are weak in this new education approach and their course preparations are of low quality. Therefore, more attention needs to be paid to the integration of the advantages of multi-media teaching and the peculiarities of physical education so that multi-media technology can be made the best use in physical education.
