This paper studies the distribution features, the chemical elements beyond standards and the influencing factors of shallow groundwater quality in the Guanzhong Basin through the data monitored in the last twenty year...This paper studies the distribution features, the chemical elements beyond standards and the influencing factors of shallow groundwater quality in the Guanzhong Basin through the data monitored in the last twenty years. The final purpose is to comprehensively evaluate the divisions of groundwater quality in the Guanzhong Basin. Results show that, the groundwater quality is in good shape, and suitable for drinking. Drinking accounts for 16.02% of the total, most of which are distributed in the lubotan of Weibei. Some come from loess plateau of Qian-Liquan County and some are generated by the industrial pollution of Xingping City. Materials exceeding standards include chloride, sulfate, three nitrogen, fluoride, manganese, iron, hexavalent chromium and so on. The main factors influencing the quality of shallow groundwater include groundwater exploitation, natural background value of special components and precipitation, among which the groundwater exploitation poses the greatest impact. The depth of water is positively correlated with the concentration of sulfate, nitrate and total hardness.展开更多
目的:系统评价慢性病病人日间过度嗜睡的影响因素。方法:计算机检索PubMed、EMbase、Web of Science、the Cochrane Library、中国知网、维普数据库、万方数据库和中国生物医学文献数据库中关于慢性病病人日间过度嗜睡影响因素的病例对...目的:系统评价慢性病病人日间过度嗜睡的影响因素。方法:计算机检索PubMed、EMbase、Web of Science、the Cochrane Library、中国知网、维普数据库、万方数据库和中国生物医学文献数据库中关于慢性病病人日间过度嗜睡影响因素的病例对照研究,检索时限为建库至2023年12月1日。由2名研究者独立进行文献筛选、资料提取、文献质量评价,采用RevMan 5.3软件进行Meta分析。结果:最终纳入15篇文献,涉及2453例病人,Meta分析结果显示,慢性病病人日间过度嗜睡的影响因素包括体质指数(BMI)[OR=1.19,95%CI(1.03,1.38),P=0.02]、睡眠呼吸暂停低通气指数(AHI)[OR=1.90,95%CI(1.06,3.41),P=0.03]、男性[OR=3.92,95%CI(2.03,7.56),P<0.0001]、匹兹堡睡眠质量指数量表(PSQI)[OR=1.09,95%CI(1.04,1.15),P=0.0003]、汉密尔顿抑郁量表(HAMD)[OR=1.14,95%CI(1.06,1.23),P=0.0004]、氧饱和度低于90%的百分比(CT90%)[OR=2.67,95%CI(1.58,4.53),P=0.0003]和Hoehn-Yahr分期评分(H-Y分期)[OR=2.08,95%CI(1.26,3.44),P=0.004]。结论:当前证据显示,BMI、AHI、男性、PSQI、HAMD、CT90%、H-Y分期是慢性病病人发生日间过度嗜睡的影响因素。展开更多
基金sponsored by the construction of urban geological environment monitoring network in Guanzhong urban agglomeration,China geological survey,Project No.Water[2012]01-007-002the research of groundwater dynamic monitoring in Shaanxi province,Shaanxi public welfare geological project,Project No.20130203
文摘This paper studies the distribution features, the chemical elements beyond standards and the influencing factors of shallow groundwater quality in the Guanzhong Basin through the data monitored in the last twenty years. The final purpose is to comprehensively evaluate the divisions of groundwater quality in the Guanzhong Basin. Results show that, the groundwater quality is in good shape, and suitable for drinking. Drinking accounts for 16.02% of the total, most of which are distributed in the lubotan of Weibei. Some come from loess plateau of Qian-Liquan County and some are generated by the industrial pollution of Xingping City. Materials exceeding standards include chloride, sulfate, three nitrogen, fluoride, manganese, iron, hexavalent chromium and so on. The main factors influencing the quality of shallow groundwater include groundwater exploitation, natural background value of special components and precipitation, among which the groundwater exploitation poses the greatest impact. The depth of water is positively correlated with the concentration of sulfate, nitrate and total hardness.
