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spherical harmonic coefficient
相关语句
  相似匹配句对
     The Improvement on Spherical Harmonic Expansion
     球谐函数级数式的改化形式
短句来源
     The spherical harmonic analysis in geomagnetism and gravitation
     在地磁学与地球重力学中的球谐分析
短句来源
     Harmonic and Administration
     谐波及其治理
短句来源
     ON HARMONIC OF VVVF
     交流变频调速(VVVF)的谐波问题
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     Regularization error estimation of spherical harmonic coefficients from SGG observation
     SGG重力场球谐系数正则解的误差估计方法
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  spherical harmonic coefficient
SHEF (spherical harmonic coefficient filter), a geometrical matching procedure constituting a preliminary step in the virtual high throughput screening of large databases of small drug-like molecules, is demonstrated.
      
This results in spherical harmonic coefficient estimates that are of similar quality to those obtained without outliers in the input data.
      


In this paper two methods have been given to calculate the geomagnetic fields at great altitudes in a local region.In the first method surface spline is used to express the distribution of the geomagnetic fields and its horizontal gradient on the ground surface,the formulas areThe surface spline can express both normal distribution and anomalous distribution of the geomagnetic fields,and also geomagnetic horizontal gradient,so the use of surface spline makes Zmuda's method simpler.The other method is with the...

In this paper two methods have been given to calculate the geomagnetic fields at great altitudes in a local region.In the first method surface spline is used to express the distribution of the geomagnetic fields and its horizontal gradient on the ground surface,the formulas areThe surface spline can express both normal distribution and anomalous distribution of the geomagnetic fields,and also geomagnetic horizontal gradient,so the use of surface spline makes Zmuda's method simpler.The other method is with the aid of spherical harmonic analysis of the geomagnetic fields in a local region,the procedure is(1)to compute a set of spherical harmonic coefficients based on the geomagnetic data on the ground surface in a local region,(2)to compute the geomagnetic fields at great altitudes by using these coefficients.

本文用曲面样条函数表示地磁场及其水平梯度在地面上的分布,从而使A.J.Zmuda提出的计算高空磁场的方法更加简便。本文还给出了借助于局部地区地磁场的球谐分析,计算高空磁场的方法。

The magnetopause exerts a tremendous influence on magnetic field within the magnetosphere.In this paper we have calculated the magnetic field of the magneto-pause on following assumptions: (1) the earth's magnetic field is a dipole field;(2) the magnetopause is an ideal conductor so that the perpendicular component of the total magnetic field at the magnetopause is zero;(3) the magnetopause is regular and is composed of three parts: a hemisphere,a cylinder and a cap.At first we evolute the spherical harmonic...

The magnetopause exerts a tremendous influence on magnetic field within the magnetosphere.In this paper we have calculated the magnetic field of the magneto-pause on following assumptions: (1) the earth's magnetic field is a dipole field;(2) the magnetopause is an ideal conductor so that the perpendicular component of the total magnetic field at the magnetopause is zero;(3) the magnetopause is regular and is composed of three parts: a hemisphere,a cylinder and a cap.At first we evolute the spherical harmonic coefficients by the method of least square,then trace the magnetic field lines by means of numerical integral.The results are that on sunward side the magnetic field,especially the position of the neutral point and the shape of the polar cusp are close to the observational results.But on anti-sunward side,in the vicinity of the equator the calculated magnetic field lines are not parallel to the equator,this result indicates that the effects of the current sheet in the magnetotail can not be neglected in this region.We have made this calculation for three angles between the magnetic dipole and the direction of the solar wind: 90°,the average situation of the earth's magnetosphere;60°,the extreme situation of the earth's magnetosphere;and 0?the situation of the Uranus' magnetosphere.

太阳风与地磁场相互作用形成的磁层顶对磁层内磁场有重要影响。本文假定地磁场为偶极子,太阳风为理想导体,在太阳风与磁层的边界上满足磁场法向分量为零的边界条件。采用最小二乘法求得磁层顶电流在磁层内产生的磁场的球谐系数。从计算结果可以看出磁层顶对磁层磁场的影响。结果表明,向阳面的磁场、中性点、极光区的位置与形状与实际观测比较接近;磁尾磁场与实际观测相差较远,原因是没有加上磁尾片电流。文中还给出了太阳风与地磁轴交不同角度时的磁层磁场的计算结果。

We have cnmputed the geomagnetic field lines from degree one to degreeeight at some low-latitudes. Their main characters, convergency and the factorseffecting the precision of computation have herein been discussed, The resultsshow that: (1) the deviation of adjacent geomanetic field lines is small whenabove degree 4; (2) there is the optimum step in computation; (3) it shouldtake into account that the higher degree of spherical harmonic coefficients havean effect on the numerical computation of geomagnetic...

We have cnmputed the geomagnetic field lines from degree one to degreeeight at some low-latitudes. Their main characters, convergency and the factorseffecting the precision of computation have herein been discussed, The resultsshow that: (1) the deviation of adjacent geomanetic field lines is small whenabove degree 4; (2) there is the optimum step in computation; (3) it shouldtake into account that the higher degree of spherical harmonic coefficients havean effect on the numerical computation of geomagnetic field lines even if ata higher latituds.

本文用球谐级数计算了低纬几个不同纬度上N=1到8的各阶地磁场力线。讨论了它们的主要特征、收敛性以及影响计算精度的因素。结果指出:(1)N=4阶以后力线相对偏差已经不大;(2)计算中存在最佳步长;(3)对于地磁力线的数值计算,即使在较高纬度也需考虑高阶项的影响。

 
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