查询词典 effective cross section

If the fluid flow separated from the sharp edge of the rearward steps reattached in the effective region, the reseparated point would occur downstream of the cross section of the cylinder and the drag would be reduced.

对再附流动的有限级数解表明，由有效再附区开始的再附边界层能够保持其边界层状态，发展至柱面最大迎流截面之后的流动再分离点。

As a preliminary theoretical exploration, a limited series of stream function was employed to study the characteristics of the reattachment boundary layer. The tentative analysis showed that the reattachment boundary layer of the circular cylinder, so long as it began at the effective reattachment region discussed above, would be developing to its reseparated point downstream the cross section of the cylinder, which essentially gave the new idea RCDR a theoretical cycle.

本文提出的&再附—减阻&机制可表述为：柱面上扰流元件后向锐缘处诱发的流动分离，既改变了柱面压强分布格局，又破坏了柱面附近的流动状态；若扰流元件锐缘后方流动在圆柱壁面上再附，形成再附边界层，再附边界层将沿流向发展，直至越过柱面最大迎流截面之后，才从圆柱面上分离，致使分离流的尾涡区变窄，绕流阻力降低。

The is related to the frequency dependent absorption cross section and the density and spatial distribution of atoms in the lower level of the transition. Position dependent 5P3/2 state densities had been combined with the collisional broadening rate 5P3/2 5S1/2 line due to both helium and cesium perturbers to yield the .The effective radiative rates of the Rb D2 line as a function of the He pressure PHe were obtained . The fluorescence intensity I780 of the 5P3/2 5S1/2 emission was measured simultaneously.

由于辐射陷获存在，有效辐射率是自然辐射率与透射因子（发射的光子在探测区域内没有被吸收的平均概率，它与吸收截面及激发态原子密度和空间分布有关）的乘积。5P3/2原子密度及其空间分布结合5P3/2 5S1/2跃迁线的碰撞增宽计算了透射因子，从而得到了不同He气压下，Rb D2线的有效辐射率。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。