利用毕奥-萨伐尔定律计算出载流圆线圈平面内和轴线上磁场分布的数学表达式,并结合实验数据分析研究载流圆线圈平面内部分场点的磁场分布情况以及轴线上磁感应强度的大小.结果表明,载流圆线圈平面内任意点的磁感应强度的大小与线圈半径...利用毕奥-萨伐尔定律计算出载流圆线圈平面内和轴线上磁场分布的数学表达式,并结合实验数据分析研究载流圆线圈平面内部分场点的磁场分布情况以及轴线上磁感应强度的大小.结果表明,载流圆线圈平面内任意点的磁感应强度的大小与线圈半径和该点到圆心的距离有关,而载流圆线圈轴线上的磁场随场点到圆心距离的增大而逐渐减弱,且与轴线两端成对称分布.从而进一步加深了对毕奥-萨伐尔定律的认识.此外,采用软件Mac Os Grapher辅助处理实验数据,使结论更具直观性.展开更多
Based on lightning monitoring data obtained by Heilongjiang lightning location network during 2015-2017, total characteristics, current intensity, annual change trend and density distribution characteristics of lightn...Based on lightning monitoring data obtained by Heilongjiang lightning location network during 2015-2017, total characteristics, current intensity, annual change trend and density distribution characteristics of lightning in Heilongjiang Province in the three years were analyzed by using statistical analysis method. The results showed that total lightning showed an increasing trend in Heilongjiang in recent years, and average intensity of negative lightning was obviously larger than that of positive lightning, and intensity of ground lightning mainly concentrated in 10-50 kA. Thunder and lightning activity of Heilongjiang was mainly in summer and concentrated during June-September. Daily variation of lightning frequency in Heilongjiang showed obvious single-peak-single-valley type, and change trends of positive lightning, negative lightning and total lightning were basically consistent. Frequent occurrence period of lightning mainly concentrated in 13:00-19:00, accounting for 50.6% of total frequency of lightning, and it was key period of lightning defense in Heilongjiang Province. Regional distribution of lightning density had obvious difference, and lightning mainly concentrated in the Greater Khingan Mountains of north Heilongjiang and Harbin, Yichun and Suihua of central Heilongjiang.展开更多
基于河北省电力部门2005—2014年16站闪电定位资料,对京津冀地区地闪频次和雷电流强度的时空分布特征进行统计分析。结果表明,京津冀地区正地闪占地闪总数的7.33%,该比率高于河南的3.16%,低于内蒙古高原的9.60%。地闪主要出现在夏季,占...基于河北省电力部门2005—2014年16站闪电定位资料,对京津冀地区地闪频次和雷电流强度的时空分布特征进行统计分析。结果表明,京津冀地区正地闪占地闪总数的7.33%,该比率高于河南的3.16%,低于内蒙古高原的9.60%。地闪主要出现在夏季,占全年的90.0%;春、秋两季,正地闪所占比率高于地闪频繁的夏季。地闪主要出现在15:00—19:00,最大值出现在16:00,其中正地闪的峰值比负地闪晚1 h。该地区50%以上的地闪雷电流强度集中在20~45 k A之间,其中负地闪与正地闪的平均雷电流强度分别为40.46 k A、74.16 k A,正地闪的平均雷电流强度是负地闪的1.8倍。3月的平均雷电流强度最大;上午的平均雷电流强度大于下午。地闪高密度区主要集中在燕山南麓和太行山东麓迎风坡面的山区与平原过渡区、下垫面水汽充足的水体和湿地区域以及人口相对集中的城市中心区;雷电流强度>80 k A的闪电主要分布在京津冀地区的东部沿海、河北中东部平原、张家口西北部以及承德北部,且闪电强度较大的地区闪电密度较小。唐山、保定、沧州地区处于地闪密度和地闪雷电流强度的高值区,该区域在建设工程的选址和防雷装置设计中应充分重视并加强对雷电灾害的防御措施。展开更多
文摘利用毕奥-萨伐尔定律计算出载流圆线圈平面内和轴线上磁场分布的数学表达式,并结合实验数据分析研究载流圆线圈平面内部分场点的磁场分布情况以及轴线上磁感应强度的大小.结果表明,载流圆线圈平面内任意点的磁感应强度的大小与线圈半径和该点到圆心的距离有关,而载流圆线圈轴线上的磁场随场点到圆心距离的增大而逐渐减弱,且与轴线两端成对称分布.从而进一步加深了对毕奥-萨伐尔定律的认识.此外,采用软件Mac Os Grapher辅助处理实验数据,使结论更具直观性.
基金Supported by Joint Guidance Project of Heilongjiang Natural Science Foundation(LH2019E120)Scientific Research Projects of Heilongjiang Meteorological Bureau(HQ2019016)
文摘Based on lightning monitoring data obtained by Heilongjiang lightning location network during 2015-2017, total characteristics, current intensity, annual change trend and density distribution characteristics of lightning in Heilongjiang Province in the three years were analyzed by using statistical analysis method. The results showed that total lightning showed an increasing trend in Heilongjiang in recent years, and average intensity of negative lightning was obviously larger than that of positive lightning, and intensity of ground lightning mainly concentrated in 10-50 kA. Thunder and lightning activity of Heilongjiang was mainly in summer and concentrated during June-September. Daily variation of lightning frequency in Heilongjiang showed obvious single-peak-single-valley type, and change trends of positive lightning, negative lightning and total lightning were basically consistent. Frequent occurrence period of lightning mainly concentrated in 13:00-19:00, accounting for 50.6% of total frequency of lightning, and it was key period of lightning defense in Heilongjiang Province. Regional distribution of lightning density had obvious difference, and lightning mainly concentrated in the Greater Khingan Mountains of north Heilongjiang and Harbin, Yichun and Suihua of central Heilongjiang.
文摘基于河北省电力部门2005—2014年16站闪电定位资料,对京津冀地区地闪频次和雷电流强度的时空分布特征进行统计分析。结果表明,京津冀地区正地闪占地闪总数的7.33%,该比率高于河南的3.16%,低于内蒙古高原的9.60%。地闪主要出现在夏季,占全年的90.0%;春、秋两季,正地闪所占比率高于地闪频繁的夏季。地闪主要出现在15:00—19:00,最大值出现在16:00,其中正地闪的峰值比负地闪晚1 h。该地区50%以上的地闪雷电流强度集中在20~45 k A之间,其中负地闪与正地闪的平均雷电流强度分别为40.46 k A、74.16 k A,正地闪的平均雷电流强度是负地闪的1.8倍。3月的平均雷电流强度最大;上午的平均雷电流强度大于下午。地闪高密度区主要集中在燕山南麓和太行山东麓迎风坡面的山区与平原过渡区、下垫面水汽充足的水体和湿地区域以及人口相对集中的城市中心区;雷电流强度>80 k A的闪电主要分布在京津冀地区的东部沿海、河北中东部平原、张家口西北部以及承德北部,且闪电强度较大的地区闪电密度较小。唐山、保定、沧州地区处于地闪密度和地闪雷电流强度的高值区,该区域在建设工程的选址和防雷装置设计中应充分重视并加强对雷电灾害的防御措施。
