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51.
  • Chen, Tao, et al. (författare)
  • Comprehensive applicability evaluation of multi-source snow depth datasets over the Tibetan Plateau
  • 2022
  • Ingår i: Journal of Glaciology and Geocryology. - 1000-0240. ; 44:3, s. 795-809
  • Tidskriftsartikel (refereegranskat)abstract
    • Snow cover over the Tibetan Plateau has an important impact on the regional climate and water cycle. At present, the existing snow cover datasets have great uncertainty across this region, so the applicability assessment is indispensable in order to make best use of the advantages and bypass the disadvantages. In this study, a comprehensive quantitative evaluation of multiple variables and multiple evaluation indicators was carried out for three snow depth datasets over the Tibetan Plateau against the meteorological station observations(OBS). The three snow depth datasets include one passive microwave remote sensing dataset(CHE)and two reanalysis datasets(ERA5-Land and MERRA2). The variables are the annual mean snow depth, the annual maximum snow depth, and the annual snow cover days. In addition, the evaluation indicators are seasonal cycle, climatology, maximum value, standard deviation, interannual variation, and trend. A rank score(RS)value of 0~1 is computed for each evaluation indicator of each variable, the larger value of RS indicate relatively better performance of a snow depth dataset. Assessment results imply that, comprehensively considered, MERRA2 exhibits best agreement with OBS, followed by ERA5-Land, and finally CHE. Evaluate based on the RS of each variable, MERRA2 shows better performance on annual maximum snow depth and annual snow cover days, CHE shows better performance on annual mean snow depth. Evaluate based on the RS of each evaluation indicator, CHE shows advantages in describing trend, ERA5-Land exhibits better agreement with OBS on interannual variation, and MERRA2 show better performance on the rest of the indicators including seasonal cycle, climatology, maximum value and standard deviation. The RS statistics in terms of regional average and spatial distribution show that CHE performs better in the former, and ERA5-Land performs better in the latter. On the other hand, there are obvious deficiencies in all three snow depth datasets. MERRA2 has insufficient ability to characterize the interdecadal variation in snow cover, and its qualitative results for trend in snow cover is inconsistent with OBS, the reason for the first deficiency needs to be further studied and the second deficiency may be mainly related to its simulation capability to precipitation trend. ERA5-Land significantly overestimates the snow cover over the Tibetan Plateau, this may be mostly related to its data assimilation scheme. CHE has poor ability to characterize the spatial distribution of snow cover, coarse spatial resolution of passive microwave remote sensing may be the main reason. The conclusions are only applicable to the central and eastern part of the Tibetan Plateau due to the scarcity of meteorological station in west part of the Tibetan Plateau. Based on the remote sensing and reanalysis data, there is great uncertainty in the trend of snow cover in the western part of the Tibetan Plateau. These systematic classification evaluation of the three representative snow depth datasets provides information on data selection and data refinement.
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52.
  • Chen, Xiaochen, 1984, et al. (författare)
  • South Pacific Developmental Regionalism: Concept, Characteristics and Progress
  • 2019
  • Ingår i: The Journal of South China Sea Studies. - 2096-0166. ; 5:4, s. 100-109
  • Tidskriftsartikel (refereegranskat)abstract
    • Developmental regionalism is a combination of the frontier theory of regionalism and the practice of regionalism in developing countries. It also reflects China's Views on Global Governance, in particular supporting expanding representation and voice of developing countries in international affairs. This paper studies the general concept of developmental regionalism and its uniqueness in the South Pacific Region (SPR). By taking the new developments of South Pacific regionalism in the new era as case studies, the paper investigates how the connotation of developmental regionalism and the characteristics of the South Pacific shape the core features of the developmental regionalism in the South Pacific beyond regional integration, trade issues and purely economic development, focusing on regional collective diplomacy with oceanic characteristics, in particular in the issues concerning the South Pacific such as climate change and fisheries and ocean governance, which works for generalized regional development rights.
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53.
  • Chen, Xiangrong, 1982, et al. (författare)
  • Study on conducting characteristics of electrical trees in cross-linked polyethylene cable insulation
  • 2012
  • Ingår i: Wuli Xuebao/Acta Physica Sinica. - : Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences. - 1000-3290. ; 61:8, s. Art. no. 087701-
  • Tidskriftsartikel (refereegranskat)abstract
    • The conducting characteristics of two typical electrical trees in cross-linked polyethylene (XLPE) cable insulation are studied by a combination of optical microscopy observation, partial discharge measurement and con-focal Raman spectroscopy analysis. Although they are grown under similar conditions, these two trees display very different shapes. One is a typical branch-pine tree grown at 9 kV, and the other is a branch tree grown at 11 kV. The growth and the partial discharge regularities show obvious differences. The disordered graphitic carbon is condensed in the main tree channels of the branch-pine tree. From the relative intensity of the graphitic carbon G band to D band, the graphitic domain is estimated to be about 8 nm in size. The tree channel resistance per unit length is less than 10 Ω· μm-1, which is sufficient to prevent the partial discharge from developing within the tree structure. The branch-pine tree shows the features of the conducting tree. The fluorescence background is observed in the channels of branch tree, which shows the existence of the products of the material degradation, but no disordered graphitic carbon is observed in these tree channels. These tree channels display obvious non-conducting characteristics, which is not sufficient to prevent the continuous effect of the partial discharges. Finally, a single channel growth model is proposed for the conducting and non-conducting trees grown in XLPE cable insulation. Based on the equivalent circuit theory, the growth mechanisms of the two trees with different conducting characteristics in XLPE cable insulation are discussed.
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54.
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55.
  • Cheng, C., et al. (författare)
  • Optimization and elimination of black center of a large-bore copper vapor laser
  • 2000
  • Ingår i: Wuli xuebao. - : Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences. - 1000-3290. ; 49:7, s. 1267-1272
  • Tidskriftsartikel (refereegranskat)abstract
    • Applying a genetic algorithm and taking the maximum output as an objective funct ion, a copper vapor laser with about 100W output is optimized and designed for reducing the “black center” of the radial laser intensity. The “black center ”, which results from the skin effect of the continuing pulsed field, is reduce d and the output is increased significantly by optimizing the laser tube radius- length and the LC circuit parameters.
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57.
  • Corradi, Marco Claudio, et al. (författare)
  • 欧洲国家援助法发展历程
  • 2017
  • Ingår i: 以竞争促增长:国际视角. - 9787508670805 ; , s. 97-97
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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