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汉魏六朝南方环境的改造与华夏社会的地域认同
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作者 李荣华 《广西社会科学》 CSSCI 北大核心 2016年第7期111-116,共6页
秦汉时期,中原华夏社会对南方存在着较大的偏见,认为该地经济落后、环境恶劣、毒物众多。东晋南朝时期,中原移民的南下,南方的生态环境得到改造。水利工程的修建、农业景观的建立,各种毒物的分布范围日益缩小,人们的生存环境进一步改善... 秦汉时期,中原华夏社会对南方存在着较大的偏见,认为该地经济落后、环境恶劣、毒物众多。东晋南朝时期,中原移民的南下,南方的生态环境得到改造。水利工程的修建、农业景观的建立,各种毒物的分布范围日益缩小,人们的生存环境进一步改善。偏居于长江中下游地区的华夏人群对南方环境的认识进一步深化,重新建构了这一地区的风景模式,这意味着华夏社会对南方的接纳和认同,也从根本上奠定了隋唐时期南方社会与中原社会整合的基础。 展开更多
关键词 华夏社会 南方环境 风景模式 地域认同
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一种基于WiFi热点功能的变电站无线视频数据转换器的设计 被引量:1
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作者 徐强超 李中明 +2 位作者 袁田 刘健欣 付启明 《电力系统装备》 2020年第17期192-195,共4页
目前变电站的视频监控都是固定监控摄像机,这种监控方式无法监视到运维人员的工作细节,没有连续性,也无法把运维人员操作过程全部记录下存档,针对这一空白,提出一种基于WiFi热点的无线视频数据转换器,这种以第一人称的方式直观地对现场... 目前变电站的视频监控都是固定监控摄像机,这种监控方式无法监视到运维人员的工作细节,没有连续性,也无法把运维人员操作过程全部记录下存档,针对这一空白,提出一种基于WiFi热点的无线视频数据转换器,这种以第一人称的方式直观地对现场工作人员进行持续监控,观察角度更为直接清晰,监控系统效能得到较大提升。 展开更多
关键词 WIFI热点 南方电网视频及环境监控规范 数据转换器 变电站
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Community replacement sequences and paleoenvironmental changes in reef areas of South China from Late Permian to Early Triassic exemplified by Panlongdong section in northeastern Sichuan Basin 被引量:4
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作者 LIU LiJing JIANG HongXia +1 位作者 WU YaSheng CAI ChunFang 《Science China Earth Sciences》 SCIE EI CAS 2014年第5期1093-1108,共16页
The well-known Permian Changhsingian calcisponge reef located at Panlongdong section,Xuanhan county,northeastern Sichuan Basin has attracted wide attention.Due to severe dolomitization and poor quality of the fossils,... The well-known Permian Changhsingian calcisponge reef located at Panlongdong section,Xuanhan county,northeastern Sichuan Basin has attracted wide attention.Due to severe dolomitization and poor quality of the fossils,the P-T boundary in this section is difficult to determine.This study,for the first time,recognized six communities in the Upper Permian Changhsingian Changxing Formation through the Lower Triassic Induan Feixianguan Formation of the Panlongdong section.They are Bryozoan-Archaeolithoporella-calcisponge Community,Calcareous green algae-foraminifer-crinoid Community,Microgastropod-foraminifer Community,Ostracod-microgastropod-cystic microbe Community,Ostracod-small brachiopod Community,and Non-calcified cyanobacteria Community.By using community replacement and palaeoenvironmental analysis,for the first time,we set the P-T boundary of the Panlongdong section at the middle of the calcimicrobialite containing cystic microbes.The community replacement sequence in the Panlongdong section is similar to that in other contemporaneous sections in reef areas of South China,indicating universal palaeoenvironmental changes during the Permian-Triassic transition.The results show that:(1)Changhsingian calcisponge reefs in South China generally vanished before the mass extinction and may be related to the large regression in the Late Permian.(2)The Calcareous green algae-foraminifer-crinoid Community replaced reef community and continued till the mass extinction.The mass extinction was probably related to the global sea-level drop.(3)The first aftermath community was dominated by specialized microgastropods,followed by the microbes,and then by the specialized microgastropods and small brachiopods.The succession of the three communities reflected the change in environmental conditions from dysoxic to anoxic and again to dysoxic.(4)In the Early Triassic,the relict community in shallow sea had very low diversity and low abundance,and was dominated by crinoids,gastropods,and bivalves. 展开更多
关键词 Panlongdong Permian-Triassic boundary mass extinction community replacement sequences paleoenvironmentalchanges South China sea-level drop
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