The seasonal variability and spatial distribution of precipitation are the main cause of flood and drought events. The study of spatial distribution and temporal trend of precipitation in river basins has been paid mo...The seasonal variability and spatial distribution of precipitation are the main cause of flood and drought events. The study of spatial distribution and temporal trend of precipitation in river basins has been paid more and more attention. However, in China, the precipitation data are measured by weather stations （WS） of China Meteorological Administration and hydrological rain gauges （RG） of national and local hydrology bureau. The WS data usually have long record with fewer stations, while the RG data usually have short record with more stations. The consistency and correlation of these two data sets have not been well understood. In this paper, the precipitation data from 30 weather stations for 1958-2007 and 248 rain gauges for 1995-2004 in the Haihe River basin are examined and compared using linear regression, 5-year moving average, Mann-Kendall trend analysis, Kolmogorov-Smirnov test, Z test and F test methods. The results show that the annual precipitation from both WS and RG records are normally distributed with minor difference in the mean value and variance. It is statistically feasible to extend the precipitation of RG by WS data sets. Using the extended precipitation data, the detailed spatial distribution of the annual and seasonal precipitation amounts as well as their temporal trends are calculated and mapped. The various distribution maps produced in the study show that for the whole basin the precipitation of 1958-2007 has been decreasing except for spring season. The decline trend is significant in summer, and this trend is stronger after the 1980s. The annual and seasonal precipitation amounts and changing trends are different in different regions and seasons. The precipitation is decreasing from south to north, from coastal zone to inland area.展开更多
文章探索并改进注射用七叶皂苷钠的无菌检查方法。通过运用薄膜过滤法,从多个方面进行了深入研究,包括检验过程中使用的稀释液与冲洗液的对比、薄膜过滤器冲洗泵速的对比,以及不同取样方式的比较。经过实验和分析,将七叶皂苷钠注射液的...文章探索并改进注射用七叶皂苷钠的无菌检查方法。通过运用薄膜过滤法,从多个方面进行了深入研究,包括检验过程中使用的稀释液与冲洗液的对比、薄膜过滤器冲洗泵速的对比,以及不同取样方式的比较。经过实验和分析,将七叶皂苷钠注射液的无菌检查方法优化统一为:采用单筒过滤法,冲洗方法确定为每膜冲洗100 mL 0.1%无菌蛋白胨水溶液,控制溶解泵速为50 r/min,同时确保冲洗泵速不大于150 r/min。此方法可为注射用七叶皂苷钠的无菌检查提供有效的参考依据。展开更多
Based on survey of the literatre concerned,the F harm on plants,soil microbes and human health,geographic distribution of the areas with high F water and the statas of F epidemic areas are introduced. And the methods ...Based on survey of the literatre concerned,the F harm on plants,soil microbes and human health,geographic distribution of the areas with high F water and the statas of F epidemic areas are introduced. And the methods of controlling F harm and testing F in soil are also presented.展开更多
基金国家自然科学基金(the National Natural Science Foundation of China under Grant No.60472099)宁波市自然科学基金(the Natural Science Foundation of Ningbo City of China under Grant No.2006A610010)。
基金National Basic Research Program of China, No.2010CB428406 The Key Knowledge Innovation Project of the CAS, No.KZCX2-YW-126 Key Project of National Natural Science Foundation of China, No.40730632
文摘The seasonal variability and spatial distribution of precipitation are the main cause of flood and drought events. The study of spatial distribution and temporal trend of precipitation in river basins has been paid more and more attention. However, in China, the precipitation data are measured by weather stations （WS） of China Meteorological Administration and hydrological rain gauges （RG） of national and local hydrology bureau. The WS data usually have long record with fewer stations, while the RG data usually have short record with more stations. The consistency and correlation of these two data sets have not been well understood. In this paper, the precipitation data from 30 weather stations for 1958-2007 and 248 rain gauges for 1995-2004 in the Haihe River basin are examined and compared using linear regression, 5-year moving average, Mann-Kendall trend analysis, Kolmogorov-Smirnov test, Z test and F test methods. The results show that the annual precipitation from both WS and RG records are normally distributed with minor difference in the mean value and variance. It is statistically feasible to extend the precipitation of RG by WS data sets. Using the extended precipitation data, the detailed spatial distribution of the annual and seasonal precipitation amounts as well as their temporal trends are calculated and mapped. The various distribution maps produced in the study show that for the whole basin the precipitation of 1958-2007 has been decreasing except for spring season. The decline trend is significant in summer, and this trend is stronger after the 1980s. The annual and seasonal precipitation amounts and changing trends are different in different regions and seasons. The precipitation is decreasing from south to north, from coastal zone to inland area.
文摘文章探索并改进注射用七叶皂苷钠的无菌检查方法。通过运用薄膜过滤法,从多个方面进行了深入研究,包括检验过程中使用的稀释液与冲洗液的对比、薄膜过滤器冲洗泵速的对比,以及不同取样方式的比较。经过实验和分析,将七叶皂苷钠注射液的无菌检查方法优化统一为:采用单筒过滤法,冲洗方法确定为每膜冲洗100 mL 0.1%无菌蛋白胨水溶液,控制溶解泵速为50 r/min,同时确保冲洗泵速不大于150 r/min。此方法可为注射用七叶皂苷钠的无菌检查提供有效的参考依据。
文摘Based on survey of the literatre concerned,the F harm on plants,soil microbes and human health,geographic distribution of the areas with high F water and the statas of F epidemic areas are introduced. And the methods of controlling F harm and testing F in soil are also presented.
