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  reference field
     The 10th-generation international geomagnetic reference field
     第10代国际地磁参考场
短句来源
     Calculation of International Geomagnetic Reference Field Using Gauss Method of Spherical Harmonic Analysis(PC—1500 Pocket Computer)
     利用高斯球谐分析方法计算国际参考场IGRF(PG—1500机)
短句来源
     ANALYSIS OF THE INTERNATIONAL GEOMAGNETIC REFERENCE FIELD ERROR IN THE CHINA CONTINENT
     国际地磁参考场在中国大陆地区的误差分析
短句来源
     Based on the geomagnetic survey data in the eastern and central region of China for 1936, and DGRF1935 and DGRF1940, using the method of spherical cap harmonic analysis, the spherical cap harmonic model of the Chinese geomagnetic reference field for 1936(CGRF1936) is calculated.
     根据 1936年中国东部和中部地区的地磁测量资料 ,以及国际地磁参考场DGRF1935和DGRF194 0 ,用冠谐分析方法计算 1936年中国地磁参考场 (CGRF)的冠谐模型 .
短句来源
     In this paper, a calculation of normal magnetic field in China by 29× 20 grids is made from the coefficient of international geomagnetic reference field during 1945-1990. A contour map and iso-grade map of relevant normal field are compiled, and its variation regularities are also analysed.
     本文根据国际地磁参考场系数,计算了中国地区1945~1990年代2~0×2~0网格地磁正常场值,并绘出了相应的正常场等值线图和等变线图,对其变化规律进行了分析.
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  “参考场”译为未确定词的双语例句
     CGRF1936 can express the distribution of the geomagnetic field in China better than the corresponding DGRF. The root mean square(RMS) deviations of SCH model are 104.9 nT for X , 84.8 nT for Y , and 121.1 nT for Z , respectively.
     CGRF1936比相应的国际地磁参考场能更好地表示中国地磁场的分布 ,本文计算的冠谐模型的均方偏差分别为 10 4 .9nT(X分量 ) ,84 .8nT(Y分量 )和 12 1.1nT(Z分量 ) .
短句来源
     A METHOD AND PROGRAM DESIGN FOR CALCULATION OF INTERNATIONAL GEOMAGNETIC FIELD BY USING PC-1500 TYPE POCKET-SIZE COMPUTER
     用PC-1500型袖珍式计算机计算国际地磁参考场的方法和程序设计
短句来源
     M. S values of these SV models compared with observed SV values for various components are smaller than that of IGRF.
     这些SV模型系数和国际参考地磁场系数计算的SV值与相应观测的SV值比较,由中国SV模型系数得到的均方值比国际参考场的小.
短句来源
     In view of the large difference between the real geomagnetic field and the dipolar model field at low latitudes, ray tracing for whistler-mode wave propagation has been performed with IGRF (n=6).
     考虑到低纬地磁场与偶极子磁场偏离较大,本文用国际参考场(n=6)进行了低纬哨声射线追迹计算.
短句来源
     In this paper, the variation of centric dipole moment between 1945 to 1995, the spatial power spectrum of the geomagnetic total field and X、Y、Zcomponet,the drift of longitudinal and meridianal of the spatial spectrum of the secular variation, the westward drift of the non- dipole field have been studied using International geomagnetic field rference.
     本文根据最新修正的国际地磁参考场模型,研究了1945-1995地磁场中心偶极矩变化,地磁总场及其分量X、Y、Z的空间功率谱,地磁场长期变化谱的经向漂移和纬向漂移的功率谱和西向漂移速度。
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  相似匹配句对
     [Ch,34 ref.]
     34
短句来源
     Refs 14.
     14
短句来源
     On Writing Skill of Composition for Examination
     考场作文的写作技巧
短句来源
     The design and implementation of web test
     网络考场的设计与实现
短句来源
     An Automatic Generation System for Examination ID Cards
     考场考证自动生成系统
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  reference field
By using the International Geomagnetic Reference Field IGRF-2000, the multipole models of the EMF, corresponding to quadrupole, octupole, and higher-order approximations, were constructed and studied in this work.
      
The second part of this paper is to discuss the influences of the spherical harmonic reference field, the limited capsize, and the singular integral on the computation of the vertical deflections.
      
Higher-degree reference field in the generalized Stokes-Helmert scheme for geoid computation
      
Numerical solution of geodetic boundary value problems using a global reference field
      
The classical Bruns formula is derived from the reference field of the first term of spherical harmonic expansion (w=gm/r) based on the reference equipotential sphere Sr02 of radius r0=gm/W0.
      
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Through aquiring the smoothed curves of the total intensity of the geomagnetic field T and their vertical component Z from 14 geomagnetic observatories both within and around China (25°-55°N,105°-145°E) , the secular annual change rates at each of the observatories and the isoporic distribution over longitude, latitude and time have been obtained.Using the time-space distribution as the reference field of the geomagnetic secular variation, the data from 5 geomagnetic observatories and 10 observation points were...

Through aquiring the smoothed curves of the total intensity of the geomagnetic field T and their vertical component Z from 14 geomagnetic observatories both within and around China (25°-55°N,105°-145°E) , the secular annual change rates at each of the observatories and the isoporic distribution over longitude, latitude and time have been obtained.Using the time-space distribution as the reference field of the geomagnetic secular variation, the data from 5 geomagnetic observatories and 10 observation points were corrected. It is found out that the Z component at the Changli observatory systematically deviated from the analog line calculated from the reference field since 1973 to 1976 with the maximum deviation of +10γ in 1975. And from the Tangshan earthquake to the end of 1978, it coincided with the analog line. From 1975 to 1976, the deviation systimatically away from the analog line was-12γ at the Tangshan observation point located in the ma-jestoseismic area. And the T deviation was +8γ at the Ninghe point close to the epicenter of the strong aftershock (Ms=6.9) on the east side of the Ji Canal fault. Meanwhile, the T of the Dongditou site on the west side of the fault deviated by-10γ. The expanding band of T and Z anomalies was basically consistent with the source area. The deviations were less than 2γ at the observatories far from the epicenter.

利用我国及邻近地区(北纬25°—55°,东经105°—145°)14个台站1969—1978年地磁总场强度 T 和垂直分量 Z 绝对观测的年均值时序曲线,经平滑后求得各台逐年的年变率,在空间模式的基础上进而求得 T、Z 年变率随经度、纬度和时间的二次时空分布模式。以此为地磁长期变的时间—空间参考场,审核了昌黎、宝坻、青光、北京和红山五个台站及10个测点截至1978年底绝对测量资料。发现昌黎台地磁垂直分量 Z 自1973年起至1976年系统偏离由参考场计算的拟合曲线,1975年偏差达最大值,幅值为+10r,1976年大震后至1978年底实测值与拟合曲线相当吻合;位于唐山极震区的唐山测点 Z,在1975—1976年系统偏离拟合曲线-12r;位于唐山余震 M_s=6.9震中附近的宁河测点 T 与拟合曲线系统偏差+8r,此测点位于蓟运河断裂之东侧;断裂西侧的东堤头测点T 的系统偏差为-1Or。Z、T 二分量总的异常展布范围与震源区基本相符。距震中位置较远的台站和测点未有超出2σ的偏差。实测值相对于拟合曲线的系统偏离可能是唐山地震的震磁效应。

The fast Fourier transform (FFT) technique is a very powerful tool for the efficient evaluation of gravity field convolution integrals. At present, there exist three types of convolution formulae in use, i.e. the planar 2D convolution, the spherical 2D convolution and the spherical 1D convolution. As we know, the largest drawback of both the planar and the spherical 2D FFT methods is that, due to the approximations in the kernel function, only non exact results can be achieved. Apparently, the reason is the...

The fast Fourier transform (FFT) technique is a very powerful tool for the efficient evaluation of gravity field convolution integrals. At present, there exist three types of convolution formulae in use, i.e. the planar 2D convolution, the spherical 2D convolution and the spherical 1D convolution. As we know, the largest drawback of both the planar and the spherical 2D FFT methods is that, due to the approximations in the kernel function, only non exact results can be achieved. Apparently, the reason is the meridian convergence at higher latitudes. As the meridians converge, the Δ φ , Δ λ blocks don't form a rectangular grid, as is assumpted in 2D FFT methods. It should be pointed out that the meridian convergence not only leads to an approximation error in the kernel function, but also causes a approximation error during the implementation of 2D FFT in computer. In order to reduce the impact of the second type of approximation error, a modified spherical 2D FFT formula for the computation of geoid undulations has been developed in this paper. A series of numerical tests have been carried out to illustrate the improvement made upon the old spherical 2D FFT. The second part of this paper is to discuss the influences of a spherical harmonic reference field, a limited cap size and a modified Stokes kernel on geoid computation. The geoid results over China by applying different modified Stokes kernel with different integration radii have been compared to GPS leveling and altimeter measured geoidal undulations to obtain a set of optimum geoid computation parameters.

本文首先从普通二维 FFT算法的基本定义和要求出发 ,深入分析和比较了大地水准面二维平面和二维球面 FFT算法的特点和差异 ,找出了影响二维球面 FFT计算精度的主要误差源 ,并给出了二维球面 FFT计算公式的改进形式。在此基础上 ,本文详细分析讨论了参考场选取、积分球冠半径确定以及核函数改化对大地水准面计算结果的作用和影响。最后 ,本文利用全国 5′× 5′实测重力异常对我国海陆大地水准面进行了试算 ,并将计算结果分别同陆上GPS水准和海上卫星测高观测值作了比较。

The fast Fourier transform (FFT) technique is a very powerful tool for the efficient evaluation of gravity field convolution integrals.At present,there exist three types of convolution formulae in use,i.e.the planar 2D convolution,the spherical 2D convolution and the spherical 1D convolution.Up to now,many people are still used to applying the planar and spherical 2D FFT methods,due to the consideration of their gains in computer time,to perform the convolution evaluations in physical geodesy.It means that it...

The fast Fourier transform (FFT) technique is a very powerful tool for the efficient evaluation of gravity field convolution integrals.At present,there exist three types of convolution formulae in use,i.e.the planar 2D convolution,the spherical 2D convolution and the spherical 1D convolution.Up to now,many people are still used to applying the planar and spherical 2D FFT methods,due to the consideration of their gains in computer time,to perform the convolution evaluations in physical geodesy.It means that it is worthwhile discussing the question about making any possible improvement on the conventional 2D FFT approaches.As we know,the largest drawback of both the planar and the spherical 2D FFT methods is that,due to the approximations in the kernel function,only non_exact results can be achieved.Apparently,the reason is the meridian convergence at higher latitudes.As the meridians converge,the Δ φ ,Δ λ blocks do not form a rectangular grid,as is assumed in 2D FFT methods.It should be pointed out that the meridian convergence not only leads to an approximation error in the kernel function,but also causes an approximation error during the implementation of 2D FFT in computer.In order to meet the increasing needs for precise determination of the vertical deflections,this paper derives a more precise planar 2D FFT formula for the computation of the vertical deflections.After having made a detailed comparison between the planar and the spherical 2D FFT formulae,we find out the main source of errors causing the loss in accuracy by applying the conventional spherical 2D FFT method.And then,a modified spherical 2D FFT formula for the computation of the vertical deflections is developed in this paper.A series of numerical tests have been carries out to illustrate the improvement made upon the old spherical 2D FFT.The second part of this paper is to discuss the influences of the spherical harmonic reference field,the limited capsize,the limited area extend,the discretization,the edge effects and the singular integral on the computation of the vertical deflections.The results of the vertical deflections over China by applying the spherical 1D FFT formula with different integration radii have been compared to the astro_observed vertical deflections in the South China Sea to obtain a set of optimum deflection computation parameters.

首先导出了更加严密的二维平面FFT垂线偏差计算公式 ,在深入分析和比较二维平面和二维球面FFT算法特点和差异的基础上 ,给出了二维球面FFT计算公式的改进形式 ,并通过大量的数值计算 ,详细讨论了参考场选取、积分球冠半径确定、边缘效应、积分元离散化误差以及计算点奇异积分处理对垂线偏差计算结果的作用和影响。最后 ,利用全国 5′× 5′实测重力异常对我国海陆垂线偏差进行了试算 ,并将计算结果同实际观测值作了比较。

 
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