一般通过在国界外围均匀添加一定数量的IGRF点以改善区域地磁场模型的边界效应.而最新的地磁场综合模型(Comprehensive Model 4,CM4)可以计算1960～2002年内全球任意区域的地核场、地壳场、磁层场及其感应场、电离层场及其感应场,其内...一般通过在国界外围均匀添加一定数量的IGRF点以改善区域地磁场模型的边界效应.而最新的地磁场综合模型(Comprehensive Model 4,CM4)可以计算1960～2002年内全球任意区域的地核场、地壳场、磁层场及其感应场、电离层场及其感应场,其内源场比IGRF更适合作为边界补充点以提高模型精度.本文对CM4和IGRF10的地核场网格图进行了比较,并以Taylor多项式模型为例,通过将34个CM4的内源场数据点和34个IGRF10的数值点分别作为边界补充点代入计算出网格值,并将其相减以分析差异.结果显示:各分量在国内大部分区域差异很小,几乎都为0值,在境外区域除了北向分量(X),其余分量均是正值,说明结合IGRF10建立的模型在国界外区域的数值偏小.展开更多
本文利用第四代地磁场综合模型(Comprehensive Model 4,CM4),计算了1982—2001年中国大陆地区同一经度链和同一纬度链上地磁台站的磁层源磁场及其感应场、电离层源磁场及其感应场的地磁北向分量X、东向分量Y、垂直分量Z的模型值,分析了...本文利用第四代地磁场综合模型(Comprehensive Model 4,CM4),计算了1982—2001年中国大陆地区同一经度链和同一纬度链上地磁台站的磁层源磁场及其感应场、电离层源磁场及其感应场的地磁北向分量X、东向分量Y、垂直分量Z的模型值,分析了各场源磁场随时间和空间的变化特征。结果表明:在时间上,经度链和纬度链台站的磁层源磁场及其感应场均呈现出11年和27天周期性变化。电离层源磁场及其感应场具有明显的季节变化,不同年份相同季节变化形态一致但幅度不同。在空间分布上,经度链和纬度链台站磁层源磁场及其感应场的年变化幅度呈现出不同变化特征,电离层源磁场及其感应场在经度链上变化特征不同,而纬度链台站的数值基本一致。日变化分析显示,磁静日和磁扰日期间,模型数据与台站实测数据变化一致性较好,相关性较高。展开更多
本文利用第四代地磁场综合模型(Comprehensive Model 4,CM4),计算了1982—2002年隆尧地磁台站的磁层源磁场及其感应场、电离层源磁场及其感应场的地磁北向分量X、东向分量Y、垂直分量Z,分析了各场源磁场随时间的变化特征。磁层源磁场及...本文利用第四代地磁场综合模型(Comprehensive Model 4,CM4),计算了1982—2002年隆尧地磁台站的磁层源磁场及其感应场、电离层源磁场及其感应场的地磁北向分量X、东向分量Y、垂直分量Z,分析了各场源磁场随时间的变化特征。磁层源磁场及其感应场呈现出11年和27天的周期性变化,有些年的27天周期性变化显著,有些年则不太显著;电离层源磁场及其感应场具有明显的季节变化,不同年相同季节的变化形态一致但幅度不同;日变化分析显示,磁静日和磁扰日期间的模型数据与台站实测数据变化一致性较好,相关性较高。展开更多
The effect of antibacterial peptide CM4 of Bombyx mori against E. coll K12 was investigated using scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The ultrastructural changes of E. coli K1...The effect of antibacterial peptide CM4 of Bombyx mori against E. coll K12 was investigated using scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The ultrastructural changes of E. coli K12 were observed by the challenge of the purified antibacterial peptide CM4. The results showed that the antibacterial peptide caused a series of pathological changes on E. coli. SEM and TEM revealed aggregates of bacteria and SEM revealed wrin-kled bacterial surfaces in the early stage. Thereafter, plasmolysis was observed with irregular holes appearing in the two ends of bacteria and the cytoplasmic contents of the cells leaking out. Finally, bacteria became empty vesicles and disintegrated into small fragments subsequently. Comparatively, the bacterial membrane was normal and the bacterial structure remained intact in the control group.展开更多
This study creates a three-dimensional surface spline(3DSS)model of China's Mainland based on surface and CHAMP satellite observations.Through this model,the magnetic field analyses of domestic plateau(Qinghai-Tib...This study creates a three-dimensional surface spline(3DSS)model of China's Mainland based on surface and CHAMP satellite observations.Through this model,the magnetic field analyses of domestic plateau(Qinghai-Tibet Plateau 28°N-38°N,78°E-102°E),plain(middle and lower reaches of Yangtze River Plain 27°N-34°N,111°E-122°E),and marine(parts of the East and South China Seas 16°N-30°N,123°E-136°E)areas have been investigated.Single models of plateau and plain have also been created.To compare and verify results,the corresponding two-dimensional(2DTY)and three-dimensional(3DTY)Taylor polynomial models have been derived.Issues such as the removal of disturbing geomagnetic fields,the data gap between surface and satellite level,and boundary effect are all seriously considered.With an aim to evaluate the resulting model,some randomly selected points are not join the modeling,by which we thereby inspected the results in terms of residuals,change rate absolutes,and Root Mean Square Error(RMSE).Results show that except component Y,the change rate absolutes of other components are less than 1%both in domestic and single models,which means that the modeling result of 3DSS is better than the other two models.Plateau and plain 3DSS models reflect the fine distribution of the magnetic field after comparison with domestic distribution.The 3DSS model fits the plateau best,followed by the plain,while the worst fit is in the marine area.This means that the modeling precision depends mainly on the number and distribution of measuring points.展开更多
文摘一般通过在国界外围均匀添加一定数量的IGRF点以改善区域地磁场模型的边界效应.而最新的地磁场综合模型(Comprehensive Model 4,CM4)可以计算1960～2002年内全球任意区域的地核场、地壳场、磁层场及其感应场、电离层场及其感应场,其内源场比IGRF更适合作为边界补充点以提高模型精度.本文对CM4和IGRF10的地核场网格图进行了比较,并以Taylor多项式模型为例,通过将34个CM4的内源场数据点和34个IGRF10的数值点分别作为边界补充点代入计算出网格值,并将其相减以分析差异.结果显示:各分量在国内大部分区域差异很小,几乎都为0值,在境外区域除了北向分量(X),其余分量均是正值,说明结合IGRF10建立的模型在国界外区域的数值偏小.
文摘本文利用第四代地磁场综合模型(Comprehensive Model 4,CM4),计算了1982—2001年中国大陆地区同一经度链和同一纬度链上地磁台站的磁层源磁场及其感应场、电离层源磁场及其感应场的地磁北向分量X、东向分量Y、垂直分量Z的模型值,分析了各场源磁场随时间和空间的变化特征。结果表明:在时间上,经度链和纬度链台站的磁层源磁场及其感应场均呈现出11年和27天周期性变化。电离层源磁场及其感应场具有明显的季节变化,不同年份相同季节变化形态一致但幅度不同。在空间分布上,经度链和纬度链台站磁层源磁场及其感应场的年变化幅度呈现出不同变化特征,电离层源磁场及其感应场在经度链上变化特征不同,而纬度链台站的数值基本一致。日变化分析显示,磁静日和磁扰日期间,模型数据与台站实测数据变化一致性较好,相关性较高。
文摘本文利用第四代地磁场综合模型(Comprehensive Model 4,CM4),计算了1982—2002年隆尧地磁台站的磁层源磁场及其感应场、电离层源磁场及其感应场的地磁北向分量X、东向分量Y、垂直分量Z,分析了各场源磁场随时间的变化特征。磁层源磁场及其感应场呈现出11年和27天的周期性变化,有些年的27天周期性变化显著,有些年则不太显著;电离层源磁场及其感应场具有明显的季节变化,不同年相同季节的变化形态一致但幅度不同;日变化分析显示,磁静日和磁扰日期间的模型数据与台站实测数据变化一致性较好,相关性较高。
文摘The effect of antibacterial peptide CM4 of Bombyx mori against E. coll K12 was investigated using scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The ultrastructural changes of E. coli K12 were observed by the challenge of the purified antibacterial peptide CM4. The results showed that the antibacterial peptide caused a series of pathological changes on E. coli. SEM and TEM revealed aggregates of bacteria and SEM revealed wrin-kled bacterial surfaces in the early stage. Thereafter, plasmolysis was observed with irregular holes appearing in the two ends of bacteria and the cytoplasmic contents of the cells leaking out. Finally, bacteria became empty vesicles and disintegrated into small fragments subsequently. Comparatively, the bacterial membrane was normal and the bacterial structure remained intact in the control group.
基金supported by the National Natural Science Foundation of China(Nos.42030203,41974073,and 41404053)。
文摘This study creates a three-dimensional surface spline(3DSS)model of China's Mainland based on surface and CHAMP satellite observations.Through this model,the magnetic field analyses of domestic plateau(Qinghai-Tibet Plateau 28°N-38°N,78°E-102°E),plain(middle and lower reaches of Yangtze River Plain 27°N-34°N,111°E-122°E),and marine(parts of the East and South China Seas 16°N-30°N,123°E-136°E)areas have been investigated.Single models of plateau and plain have also been created.To compare and verify results,the corresponding two-dimensional(2DTY)and three-dimensional(3DTY)Taylor polynomial models have been derived.Issues such as the removal of disturbing geomagnetic fields,the data gap between surface and satellite level,and boundary effect are all seriously considered.With an aim to evaluate the resulting model,some randomly selected points are not join the modeling,by which we thereby inspected the results in terms of residuals,change rate absolutes,and Root Mean Square Error(RMSE).Results show that except component Y,the change rate absolutes of other components are less than 1%both in domestic and single models,which means that the modeling result of 3DSS is better than the other two models.Plateau and plain 3DSS models reflect the fine distribution of the magnetic field after comparison with domestic distribution.The 3DSS model fits the plateau best,followed by the plain,while the worst fit is in the marine area.This means that the modeling precision depends mainly on the number and distribution of measuring points.
