2014年美国教育研究协会(American Education Research Association,简称AERA)年会在美国费城召开,"促进实践与政策创新的教育研究力量"是本届AERA年会的主题。研究本届年会上教育科学领域共同关注的两个主题,可以全面了解本...2014年美国教育研究协会(American Education Research Association,简称AERA)年会在美国费城召开,"促进实践与政策创新的教育研究力量"是本届AERA年会的主题。研究本届年会上教育科学领域共同关注的两个主题,可以全面了解本届AERA年会上前沿的教育研究动态。教育技术领域的研究者可以从教育技术的视角,围绕"学习技术"这一核心要点,从学习过程和学习资源的设计、开发、运用与管理以及评价四个方面,对年会上涉及的教育技术相关内容进行全面解读,为教育技术自身专业的发展及其与其他学科的交叉发展提供一定的借鉴和指导方向。展开更多
2017年4月27日-5月1日,美国教育研究协会(American Educational Research Association,AERA)年会在圣安东尼奥市召开,年会的主题是"从知识到行动:实现教育机会均等的承诺"。大会研究专题广泛而新颖,其中就教育技术领域而言,...2017年4月27日-5月1日,美国教育研究协会(American Educational Research Association,AERA)年会在圣安东尼奥市召开,年会的主题是"从知识到行动:实现教育机会均等的承诺"。大会研究专题广泛而新颖,其中就教育技术领域而言,可以从教与学、技术、测评三个视角对年会上涉及的相关内容进行全面解读,并从理论研究、技术发展和研究方法三个方面对当前研究热点及趋势进行概述与分析,呈现教育技术领域的最新动态与热点研究,旨在为该领域自身发展与跨领域合作提供一定借鉴和指导。展开更多
Based on GISS-E2-R model simulations, the changes in PM2.5 and ozone concentrations during 2016– 35 are analyzed over the Jing-Jin-Ji region under different future emissions scenarios: 2.6, 4.5, 6.0, 8.5 Representati...Based on GISS-E2-R model simulations, the changes in PM2.5 and ozone concentrations during 2016– 35 are analyzed over the Jing-Jin-Ji region under different future emissions scenarios: 2.6, 4.5, 6.0, 8.5 Representative Concentration Pathways scenarios(RCP2.6, RCP4.5, RCP6.0, and RCP8.5), compared to the baseline periods of 1851–70(pre-industrial) and 1986–2005(present day). The results show that PM2.5 increases under all emissions scenarios, with the maximum value occurring in the southeastern part of the region under most scenarios. As for ozone, its concentration is projected to increase during 2016–35 under all emissions scenarios, compared to the baseline periods. The temporal evolutions of PM2.5 and ozone show PM2.5 reaching a peak during 2020–40, while ozone will likely increase steadily in the future.展开更多
Background:Biogenic volatile organic compounds(BVOCs)play an essential role in tropospheric atmospheric chemical reactions.There are few studies conducted on BVOCs emission of dominant forest species in the Jing-Jin-J...Background:Biogenic volatile organic compounds(BVOCs)play an essential role in tropospheric atmospheric chemical reactions.There are few studies conducted on BVOCs emission of dominant forest species in the Jing-Jin-Ji area of China.Based on the field survey,forest resources data and the measured standard emission factors,the Guenther model developed in 1993(G93)was applied in this paper to estimate the emission of BVOCs from several dominant forest species(Platycladus orientalis,Quercus variabilis,Betula platyphylla,Populus tomentosa,Pinus tabuliformis,Robinia pseudoacacia,Ulmus pumila,Salix babylonica and Larix gmelinii)in the Jing-Jin-Ji area in 2017.Then the spatiotemporal emission characteristics and atmospheric chemical reactivity of these species were extensively evaluated.Results:The results showed that the total annual BVOCs emission was estimated to be 70.8 Gg C·year^(−1),consisting 40.5%(28.7 Gg C·year^(−1))of isoprene,36.0%(25.5 Gg C·year^(−1))of monoterpenes and 23.4%(16.6 Gg C·year^(−1))of other VOCs.The emissions from Platycladus orientalis,Quercus variabilis,Populus tomentosa and Pinus tabulaeformis contributed 56.1%,41.2%,36.0% and 31.1%,respectively.The total BVOCs emission from the Jing-Jin-Ji area accounted for 61.9% and 1.8%in summer and winter,respectively.Up to 28.8% of emission was detected from Chengde followed by Beijing with 24.9%,that mainly distributed in the Taihang Mountains and the Yanshan Mountains.Additionally,the Robinia pseudoacacia,Populus tomentosa,Quercus variabilis,and Pinus tabulaeformis contributed mainly to BVOCs reaction activity.Conclusions:The BVOCs emission peaked in summer(June,July,and August)and bottomed out in winter(December,January,and February).Chengde contributed the most,followed by Beijing.Platycladus orientalis,Quercus variabilis,Populus tomentosa,Pinus tabulaeformis and Robinia pseudoacacia represent the primary contributors to BVOCs emission and atmospheric reactivity,hence the planting of these species should be reduced.展开更多
After the completion of Beijing New Airport, air-rail intermodality will become an important means of internal and external links in Jing-Jin-Ji Region. Jing-Jin-Ji Air-Rail Intermodality System is built and 7 sub-sys...After the completion of Beijing New Airport, air-rail intermodality will become an important means of internal and external links in Jing-Jin-Ji Region. Jing-Jin-Ji Air-Rail Intermodality System is built and 7 sub-systems are divided based on user demand analysis. Refer to the passenger process, the business process of the system is planned and the sub-systems are described using data flow diagram. The system provides theoretical support for the development of air-rail intermodal in Jing-Jin-Ji region.展开更多
Nowadays, the coordinated development of Jing-Jin-Ji has been a national strategy, and has brought unprecedented opportuniyies for the development fof education in this region. However, there are also some bottlenecks...Nowadays, the coordinated development of Jing-Jin-Ji has been a national strategy, and has brought unprecedented opportuniyies for the development fof education in this region. However, there are also some bottlenecks that restrict the development of this region. Therefore, this paper will analyze some typical cases of coordinated development of education in this region and put forward some suggestions and strategies to provide some references for the development.展开更多
文摘2014年美国教育研究协会(American Education Research Association,简称AERA)年会在美国费城召开,"促进实践与政策创新的教育研究力量"是本届AERA年会的主题。研究本届年会上教育科学领域共同关注的两个主题,可以全面了解本届AERA年会上前沿的教育研究动态。教育技术领域的研究者可以从教育技术的视角,围绕"学习技术"这一核心要点,从学习过程和学习资源的设计、开发、运用与管理以及评价四个方面,对年会上涉及的教育技术相关内容进行全面解读,为教育技术自身专业的发展及其与其他学科的交叉发展提供一定的借鉴和指导方向。
文摘2017年4月27日-5月1日,美国教育研究协会(American Educational Research Association,AERA)年会在圣安东尼奥市召开,年会的主题是"从知识到行动:实现教育机会均等的承诺"。大会研究专题广泛而新颖,其中就教育技术领域而言,可以从教与学、技术、测评三个视角对年会上涉及的相关内容进行全面解读,并从理论研究、技术发展和研究方法三个方面对当前研究热点及趋势进行概述与分析,呈现教育技术领域的最新动态与热点研究,旨在为该领域自身发展与跨领域合作提供一定借鉴和指导。
基金support from the R&D Special Fund for Public Welfare Industry (Meteorology) (Grant No. GYHY201306019)the National Natural Science Foundation of China (Grant No. 41275078)+1 种基金the Grant Projects of China Clean Development Mechanism Fund (Grant No. 121312)the Climate Change Foundation of China Meteorological Administration (Grant No. CCSF201339)
文摘Based on GISS-E2-R model simulations, the changes in PM2.5 and ozone concentrations during 2016– 35 are analyzed over the Jing-Jin-Ji region under different future emissions scenarios: 2.6, 4.5, 6.0, 8.5 Representative Concentration Pathways scenarios(RCP2.6, RCP4.5, RCP6.0, and RCP8.5), compared to the baseline periods of 1851–70(pre-industrial) and 1986–2005(present day). The results show that PM2.5 increases under all emissions scenarios, with the maximum value occurring in the southeastern part of the region under most scenarios. As for ozone, its concentration is projected to increase during 2016–35 under all emissions scenarios, compared to the baseline periods. The temporal evolutions of PM2.5 and ozone show PM2.5 reaching a peak during 2020–40, while ozone will likely increase steadily in the future.
基金supported by the grants from National Natural Science Foundation of China(No.42077454)National Research Program for Key Issues in Air Pollution Control(DQGG202126)National Natural Science Foundation of China(No.41605077).
文摘Background:Biogenic volatile organic compounds(BVOCs)play an essential role in tropospheric atmospheric chemical reactions.There are few studies conducted on BVOCs emission of dominant forest species in the Jing-Jin-Ji area of China.Based on the field survey,forest resources data and the measured standard emission factors,the Guenther model developed in 1993(G93)was applied in this paper to estimate the emission of BVOCs from several dominant forest species(Platycladus orientalis,Quercus variabilis,Betula platyphylla,Populus tomentosa,Pinus tabuliformis,Robinia pseudoacacia,Ulmus pumila,Salix babylonica and Larix gmelinii)in the Jing-Jin-Ji area in 2017.Then the spatiotemporal emission characteristics and atmospheric chemical reactivity of these species were extensively evaluated.Results:The results showed that the total annual BVOCs emission was estimated to be 70.8 Gg C·year^(−1),consisting 40.5%(28.7 Gg C·year^(−1))of isoprene,36.0%(25.5 Gg C·year^(−1))of monoterpenes and 23.4%(16.6 Gg C·year^(−1))of other VOCs.The emissions from Platycladus orientalis,Quercus variabilis,Populus tomentosa and Pinus tabulaeformis contributed 56.1%,41.2%,36.0% and 31.1%,respectively.The total BVOCs emission from the Jing-Jin-Ji area accounted for 61.9% and 1.8%in summer and winter,respectively.Up to 28.8% of emission was detected from Chengde followed by Beijing with 24.9%,that mainly distributed in the Taihang Mountains and the Yanshan Mountains.Additionally,the Robinia pseudoacacia,Populus tomentosa,Quercus variabilis,and Pinus tabulaeformis contributed mainly to BVOCs reaction activity.Conclusions:The BVOCs emission peaked in summer(June,July,and August)and bottomed out in winter(December,January,and February).Chengde contributed the most,followed by Beijing.Platycladus orientalis,Quercus variabilis,Populus tomentosa,Pinus tabulaeformis and Robinia pseudoacacia represent the primary contributors to BVOCs emission and atmospheric reactivity,hence the planting of these species should be reduced.
文摘After the completion of Beijing New Airport, air-rail intermodality will become an important means of internal and external links in Jing-Jin-Ji Region. Jing-Jin-Ji Air-Rail Intermodality System is built and 7 sub-systems are divided based on user demand analysis. Refer to the passenger process, the business process of the system is planned and the sub-systems are described using data flow diagram. The system provides theoretical support for the development of air-rail intermodal in Jing-Jin-Ji region.
文摘Nowadays, the coordinated development of Jing-Jin-Ji has been a national strategy, and has brought unprecedented opportuniyies for the development fof education in this region. However, there are also some bottlenecks that restrict the development of this region. Therefore, this paper will analyze some typical cases of coordinated development of education in this region and put forward some suggestions and strategies to provide some references for the development.
