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病例1患者男性,66岁。主因:“间断性恶心、呕吐2周,加重2天”入院。...呕吐物为胃内容物，无呕血、腹泻、腹痛、发热、头晕、头痛、胸闷、憋气等症状。自行在家服药治疗（具体药品名称不详），未到医院诊治。入院前2天，恶心、呕吐加重，持续性呕 ...

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西安市2016-2017年大气化石源CO₂的¹⁴C示踪研究与来源的初步分析
14C是研究城市中化石能源碳排放状况的有效手段;认识化石源CO2 (CO2ff)的主要来源将有利于针对性地制定减排方案。本文利用分子筛主动吸附采样方法对西安市大气CO2行了连续积时采样,并利用AMS-...

《地球环境学报》 2020年01期关键词: "14C示踪","","MDQxNjdnSDlYVjNIWExnd0pnZlhzNnpoY2I3a2wvUG5tUTJXUThmZDJXUmJpZlorOXZFeW5nVXIvTEpRPT1KQ0RZQS8y)","&#xA"," >AMS-14C示踪"," 分子筛"," 14C","","Mjc2NThvPTBaNU4xaVVzVU1uTnE1WTJDNW9JRDMwNHh4Smw2RWw3T2dxVXBSWmFlN0tXUmJxV1orTnZFaW5sVUw=)","&#xA"," >大气Δ14C"," 2","","MjMyMTNFMElQbmJtd3hBMWU3S1VUTHFhWitKdkZ5dmczc0pCZ1ZjOGJhNmpyZUEwWStnT0RYUTl1UlJsNw==)","&#xA"," >化石源CO2"," 季节变化" 收藏