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基于KEPServerEX的页岩气场站通信技术研究
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作者 吴文秀 马勇超 姜姗 《石油天然气学报》 CAS 2018年第5期86-90,共5页
针对涪陵页岩气田焦石坝区块试验井组PCS系统不能直接与后期开发井组采用的SCADA系统纳入统—平台进行集中监控的问题,提出了借助第三方OPC服务器整合PCS系统与SCADA系统的通信方案,探讨了KEPServer与PLC及SCADAvantage Explorer与KEP... 针对涪陵页岩气田焦石坝区块试验井组PCS系统不能直接与后期开发井组采用的SCADA系统纳入统—平台进行集中监控的问题,提出了借助第三方OPC服务器整合PCS系统与SCADA系统的通信方案,探讨了KEPServer与PLC及SCADAvantage Explorer与KEPServerEX的通信配置与实现方法,并以Visual Studio2013软件为主设计了人机交换界面。运行表明:采用该方案可有效完成试验井组生产过程数据与SCADA系统的信息交换,目前在涪陵页岩气田实现了33个集气站和15个井口采气平台无人值守生产。 展开更多
关键词 页岩气 KEPServerEX SCADA系统 通信技术
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Rice use history in Southeast China:Phytolith evidence from the Nanshan site in Fujian Province
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作者 Qiuhe CHEN Zhao LI +2 位作者 yongchao ma Zhenyu ZHOU Xiaoyan YANG 《Science China Earth Sciences》 SCIE EI CAS CSCD 2023年第5期1108-1119,共12页
The southern spread of rice agriculture is of great academic interest.Although it already has a broad chronological framework,newly introduced rice use and its impact on local subsistence and ecological systems are st... The southern spread of rice agriculture is of great academic interest.Although it already has a broad chronological framework,newly introduced rice use and its impact on local subsistence and ecological systems are still unclear.In this study,we explore these issues by analysing phytoliths recovered from continuous sediments of Cave No.4 at the Nanshan site in Fujian Province,together with evidence from surrounding sites.The results show that rice was introduced into southeast China at 7,500 cal.yr BP,but the dominance of the hunting-gathering system was not challenged until later,between 5,000 and 3,500 cal.yr BP,when cultivation of rice,together with foxtail and broomcorn millets,was widely practiced in the region.This suggests that mixed farming in Southeast China,likely originating around the middle Yangtze River,became widespread and gradually systematic during the previous two-millennium adoption.This rice-millet mixed agricultural system changed the former hunting-gathering subsistence system,promoting the agriculturalization process,cultural prosperity and population growth,thus providing a solid basis for rice expansion and cultural migration to Southeast Asia. 展开更多
关键词 Phytolith analysis Southward spread of rice agriculture Subsistence system China-Indo-China-Indo-China Peninsula Island Southeast Asia
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New radiocarbon and archaeobotanical evidence reveal the timing and route of southward dispersal of rice farming in south China 被引量:12
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作者 Xiaoyan Yang Qiuhe Chen +7 位作者 yongchao ma Zhao Li Hsiao-chun Hung Qianglu Zhang Zhiwei Jin Suoqiang Liu Zhenyu Zhou Xianguo Fu 《Science Bulletin》 SCIE EI CAS CSCD 2018年第22期1495-1501,共7页
The origins and spreads of rice agriculture have been enduring topics, yet the timing and southward dispersal from the Yangtze River Basin have been difficult to trace, due to the scarcity of archaeobotanical data, es... The origins and spreads of rice agriculture have been enduring topics, yet the timing and southward dispersal from the Yangtze River Basin have been difficult to trace, due to the scarcity of archaeobotanical data, especially systematic macro-plant remains examination, combined with the poor preservation in the humid climate and acidic soils of China's southern provinces.Here, we report new radiocarbon dating and preserved rice phytolith evidence, derived from three Late Neolithic archaeological sites in south China, dated about 5,000–4,100 cal a BP.Our results demonstrate that rice farming had spread southward through the mountainous regions of Wuyi and Nanling, then entered the areas of Western Fujian and North Guangdong by 5,000 cal a BP, followed by continued expansion into coastal areas of East China Sea and South China Sea, also crossing the Taiwan Strait, around 4,500–4,000 cal a BP.The North River,East River, Min River, and possibly other river systems likely were influential as pathways or conduits. 展开更多
关键词 Agriculture spread Charred RICE seeds PHYTOLITH analysis Nanshan SITE Laoyuan SITE Guangdong and Fujian
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