Estimation of water content is the foundation of natural gas processing and designing,and a formula calculation method provides a solution simple and easy to be programmed by computers.In this regard,several main form...Estimation of water content is the foundation of natural gas processing and designing,and a formula calculation method provides a solution simple and easy to be programmed by computers.In this regard,several main formula calculation methods of water content in sweet natural gas were reviewed and evaluated individually.There are formulas fitted with nomographic data(e.g.Sloan formula,Ning Yingnan formula,Khaled formula and Bahadori formula),empirical formulas fitted with experimental data(e.g.Zhu Lin formula,Behr formula and Kazim formula)and formulas generated based on water-hydrocarbon phases equilibrium(e.g.Saturated Vapor Pressure Model,Modified Ideal Model,Simplified Thermodynamic Model and Bukacek formula).The comparison of calculated and experimental values of each above formula calculation method indicates that,the Khaled formula provided the minimum average absolute deviation(AAD)–2.5240%,while the Behr method achieved the maximum AAD–19.255%.After the analysis of the AAD results calculated by the methods at different temperature ranges,the Zhu Lin formula is recommended for−50 to−40℃,the Sloan formula for−40 to 0℃,the Simplified Thermodynamic Model for 0 to 37.78°C,the Khaled formula for 37.78 to 171.11℃,and the Bukacek formula for 171.11 to 237.78℃.展开更多
目的调查2023-2024年沧州市发热伴血小板减少综合征(Severs fever with thrombocytopenia syndrome,SFTS)疑似病例及蜱虫标本中大别班达病毒(DBV)感染情况,为该地区SFTS的防治与病原监测提供科学依据。方法对沧州市2023—2024年SFTS疑...目的调查2023-2024年沧州市发热伴血小板减少综合征(Severs fever with thrombocytopenia syndrome,SFTS)疑似病例及蜱虫标本中大别班达病毒(DBV)感染情况,为该地区SFTS的防治与病原监测提供科学依据。方法对沧州市2023—2024年SFTS疑似病例及蜱虫标本进行病原学检测及病毒分离,应用高通量基因测序技术开展DBV全基因组测序,使用MEGA、DNA Star等软件构建系统发育进化树,并进行同源性比较与氨基酸变异位点分析。结果70例SFTS疑似病例标本中,DBV阳性检出率为60%(42/70),阳性病例以50~79岁农民为主,集中于沧州市盐山县与海兴县。402只蜱虫经合并为31管样本,其中有2管样本DBV核酸检测阳性,最低感染率为0.50%。共分离得到9株人源与2株蜱源DBV毒株,全基因组测序结果显示均聚类于F分支且序列间同源性超过99%,在RdRP、GP与NSs序列中共存在10个氨基酸变异位点。结论沧州市SFTS病例分布具有一定的地区聚集性,该地区蜱虫感染DBV整体处于较低水平,应进一步完善疾病预警机制,持续开展病原监测。展开更多
基金National Natural Science Foundation of China(No.u1262111).
文摘Estimation of water content is the foundation of natural gas processing and designing,and a formula calculation method provides a solution simple and easy to be programmed by computers.In this regard,several main formula calculation methods of water content in sweet natural gas were reviewed and evaluated individually.There are formulas fitted with nomographic data(e.g.Sloan formula,Ning Yingnan formula,Khaled formula and Bahadori formula),empirical formulas fitted with experimental data(e.g.Zhu Lin formula,Behr formula and Kazim formula)and formulas generated based on water-hydrocarbon phases equilibrium(e.g.Saturated Vapor Pressure Model,Modified Ideal Model,Simplified Thermodynamic Model and Bukacek formula).The comparison of calculated and experimental values of each above formula calculation method indicates that,the Khaled formula provided the minimum average absolute deviation(AAD)–2.5240%,while the Behr method achieved the maximum AAD–19.255%.After the analysis of the AAD results calculated by the methods at different temperature ranges,the Zhu Lin formula is recommended for−50 to−40℃,the Sloan formula for−40 to 0℃,the Simplified Thermodynamic Model for 0 to 37.78°C,the Khaled formula for 37.78 to 171.11℃,and the Bukacek formula for 171.11 to 237.78℃.
