助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   meridian convergence 的翻译结果: 查询用时:0.01秒
图标索引 在分类学科中查询
所有学科
更多类别查询

图标索引 历史查询
 

meridian convergence
相关语句
  子午线收敛角
     Computer programming of Gauss projection computation coordinate zone and meridian convergence angle
     高斯投影坐标换带和子午线收敛角计算编程
短句来源
     Problem of Meridian Convergence Correction
     关于子午线收敛角校正问题
短句来源
     In view of the tedious and mistakable manual calculation in measuring Gauss projection,coordinate zone transformation and meridian convergence,an itera-tive approximation method is adopted and programmed by BASIC to imple-ment the direct and converse calculation of Gauss projection and computer cal-culation of meridian convergence angle.
     针对测量工作中人工进行高斯投影、坐标换带和平面子午线收敛角计算非常麻烦又容易出错的问题,采用迭代法趋近求值,用BASIC语言编制了相应的计算机程序,实现了上述计算。
短句来源
  相似匹配句对
     Problem of Meridian Convergence Correction
     关于子午线收敛角校正问题
短句来源
     3) convergence;
     归同(convergence);
短句来源
     L-CONVERGENCE SPACES
     L-收敛空间(英文)
短句来源
     Computer programming of Gauss projection computation coordinate zone and meridian convergence angle
     高斯投影坐标换带和子午线收敛角计算编程
短句来源
     Discussing the Meridian and Collateral
     论经络
短句来源
查询“meridian convergence”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  meridian convergence
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.
      
Apparently, the reason is the meridian convergence at higher latitudes.
      


The outlet fields of the annular stator cascades of a small-Size engine with conventional twisted blades and curved-twisted blades were measured in detail. By the analysis and comparison of the tested results the conclusions are obtained as fiollows:the meridian convergence of the lower endwall can improve the flow in the tip region of the cascade with conventional twisted blades. The good combine of blade curving and controlled vortex design can notably reduce the radial secondary losses and even the...

The outlet fields of the annular stator cascades of a small-Size engine with conventional twisted blades and curved-twisted blades were measured in detail. By the analysis and comparison of the tested results the conclusions are obtained as fiollows:the meridian convergence of the lower endwall can improve the flow in the tip region of the cascade with conventional twisted blades. The good combine of blade curving and controlled vortex design can notably reduce the radial secondary losses and even the reaction of the turbine stage along blade hight.

弯扭静子叶片的环形叶栅试验徐文远,于清,杨弘,王仲奇(哈尔滨工业大学动力工程系哈尔滨150001)关键词:弯扭叶片,环形叶栅,试验随着弯扭叶片理论的发展,它在国内外叶轮机械中的应用日益广泛。在国外,弯扭叶片已应用于新一代航空发动机中,如V2500、P...

In view of the tedious and mistakable manual calculation in measuring Gauss projection,coordinate zone transformation and meridian convergence,an itera-tive approximation method is adopted and programmed by BASIC to imple-ment the direct and converse calculation of Gauss projection and computer cal-culation of meridian convergence angle. It can be operated on portable com-puter PC-1501 and has the merit of simple for input,to get the universal coor-dinate and data directly.Through practice ,it is...

In view of the tedious and mistakable manual calculation in measuring Gauss projection,coordinate zone transformation and meridian convergence,an itera-tive approximation method is adopted and programmed by BASIC to imple-ment the direct and converse calculation of Gauss projection and computer cal-culation of meridian convergence angle. It can be operated on portable com-puter PC-1501 and has the merit of simple for input,to get the universal coor-dinate and data directly.Through practice ,it is shown that the accuracy of calculation meets the requirement,the speed of calculation is quickened a hun-dred-fold to manual putation.

针对测量工作中人工进行高斯投影、坐标换带和平面子午线收敛角计算非常麻烦又容易出错的问题,采用迭代法趋近求值,用BASIC语言编制了相应的计算机程序,实现了上述计算。该程序可用于便携式PC-1501计算机,输入简便,能直接得到通用的坐标和数据。实践结果表明:其计算精度合乎要求,计算速度比人工计算提高几百倍。

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。

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关meridian convergence的内容
在知识搜索中查有关meridian convergence的内容
在数字搜索中查有关meridian convergence的内容
在概念知识元中查有关meridian convergence的内容
在学术趋势中查有关meridian convergence的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社