最新刊期
      卷 39 ， 期 1 ， 2000
      • Vol. 39, Issue 1, Pages: 23-26(2000)
        摘要：The representation space of the fundamental group of a closed , oriented Riemannian surface is identified with the moduli space of the holomorphic bundles of rank 2 with trivial determinant bundles over the surface and these spaces are proved to carry a projective structure.  
          
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        发布时间：2023-12-11
      • Vol. 39, Issue 1, Pages: 91-95(2000)
        摘要：Generic/subgeneric level data on bivalves from the Jurassic Proto-Atlantic record three regional extinction events, at the end of the Pliensbachian , beginning of the Callovian and Tithonian stages .The extinction at the Tithonian is the most important in terms of magnitude and duration .These extinctions can correlate with sea-level changes and associated environmental deterioration.The end-Pliensbachian extinction, related to anoxia caused by a sharp rise of sea level, selectively eliminated infaunal bivalves .In the Callovian event , which was linked to a regional regression, the selection against infaunal group occurred only in mid-latitude area.Tithonian event was a result of extreme and prolonged regression and lacked the selective extinction of infaunal bivalves .  
          
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        发布时间：2023-12-11
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