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focusing location
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     Based on previous stimulated Brillouin scattering (SBS) experiments, the effects oflength of sample cell, focal length and focusing location on SBS are researched. And the results are in agreement with the theoretical analysis.
     研究了样品池的长度、焦距以及聚焦位置对SBS阈值的影响,同时验证了其实验结果与理论分析相吻合.
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  相似匹配句对
     focusing on rural;
     面向农村 ,选好载体 ;
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     Iris Location
     虹膜定位
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     On Micro-Location
     微区位研究
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     lighting and focusing.
     采光与选择主焦点。
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In this paper an entrainment method for 3-D compressible turbulent boundary layer on arbitrary wings is presented. The method can be applied to cases of boundary layer with potential or non-potential external flow fields. The calculating results of this method for the C-5A aircraft wing are fairly close to that of implicit finite-difference method using Cebecis algebraic turbulent model. An example of viscosity effect on the wing lift and the aerodynamic focus location in a subson-ic Mach number using...

In this paper an entrainment method for 3-D compressible turbulent boundary layer on arbitrary wings is presented. The method can be applied to cases of boundary layer with potential or non-potential external flow fields. The calculating results of this method for the C-5A aircraft wing are fairly close to that of implicit finite-difference method using Cebecis algebraic turbulent model. An example of viscosity effect on the wing lift and the aerodynamic focus location in a subson-ic Mach number using this method is presented also in the paper.

本文采用一种拟坐标变换掺混方法,计算任意外形机翼的三维边界层流动,亦适用于边界层外流为位流或非位流情况。对C-5A机翼的计算结果表明,该方法具有同微分方法可以比拟的计算精度。并分析了在亚音速情况下粘性对机翼升力和力矩的干扰影响。

Nonlinear Schrodinger equation for 2+ 1 dimensions space-time is derived under the suppose of cylindrical symmetry.The analytical solution of the light beam propagation in a dispersive medium is obtained and the focus location of self-focusing is given.

在柱对称假定下,导出了2+1维时空的非线性Schredinger方程,得到了光束在色散介质中传播的解析解,以及自聚焦焦点的位置。

The two-dimensional hemispherical dynamo theory is based on the symmetry aboutthe equator, and has certain inherent theoretical shortcomings and limitations in application. In order to extend the dynamo theory to the globe, the assumption of thesymmetry about the equator is removed in present study, the boundary condition atthe north (or south) pole is also removed. In this way the conventional boundaryproblem becomes "boundary--free" one, which describes more reasonably the physicsof the dynamo process and...

The two-dimensional hemispherical dynamo theory is based on the symmetry aboutthe equator, and has certain inherent theoretical shortcomings and limitations in application. In order to extend the dynamo theory to the globe, the assumption of thesymmetry about the equator is removed in present study, the boundary condition atthe north (or south) pole is also removed. In this way the conventional boundaryproblem becomes "boundary--free" one, which describes more reasonably the physicsof the dynamo process and would show some essential characteristics. For instance,this method can be used to study seasonal and UT variations of the Sq currentsystem, as well as dynamo effects of the non-dipole magnetic field, all of which areasymmetric about the equator. The global current system obtained by using presentmethod for simple symmetric condition is same as that by using hemispheric symmetric dynamo theory. As for asymmetric condition, the current intensity, focus location, current direction and other characteristics show more complicated features, whichcan not be explained by hemispheric dynamo theory.

为了将建立在赤道为对称面假设基础上的二维半球域对称)电离层发电机理论扩展到全球,本文在解发电机方程时,去掉赤道对称面这一假设条件和两极附加的边界条件,使通常的边值问题变成一种“无边界’问题.它更合理地描述了电离层发电机过程,而且可以给出半球发电机理论所不能给出的特征,例如,可以对Sq电流体系的UT变化、季节变化、非偶极子地磁场部分的发电机效应等南北半球不对称的情况进行数值计算.计算实例表示,在简单的赤道对称情况下,它可以复现二维半球(对称)发电机模型的结果.在不对称情况下,电流体系的强度、焦点位置、电流方向等显示出较为复杂的变化,而半球发电机理论则无法解释这些特征.

 
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