To assess the importance of quasar outflow we have performed a series of studies on broad absorption line quasars, and have obtained the following results.（1）The UV absorption column density is an order of magnitude higher than previously believed, and low ionization BALs are formed in the high ionization zone.(2) In radio|quiet BAL quasars, the outflow is mainly confined to the equatorial directionwhile in radio|loud ones both equatorial and polar outflows are possible.(3) The polarization of resonantly scattered lines suggests that the outflow carries large angular momentum.?
为了确定外流的重要性，技术大学天体物理中心开展了宽吸收线类星体的一系列研究，取得了一些进展：(1)宽吸收线区的紫外吸收物质的柱密度比原来预计高出2个量级，低电离吸收线形成于饱和的高电离吸收线区；（2）射电宁静的宽吸收类星体吸收物质主要在赤道面，并且不同的源吸收物质分布情况很不相同，而在射电强的类星体中，赤道和极向外流都是可能的；（3）共振散射线偏振表明，外流物质携带角动量。？
Exercise 1, To figure out following physical quantities based on STV of one dimensional space and one dimensional time: mass gauge, time gauge, length gauge, mass density gauge, temperature gauge, electric current gauge, energy gauge, angular momentum gauge, charge gauge and magnetic flux gauge.
习题1 ，试根据一维空间和一维时间的时空数值求解出下述物理量：质量度规，时间度规，长度度规，质量密度度规，温度度规，电流度规，能量度规，角动量度规，电荷度规和磁通量度规。
However, the angular momentum density of multimode Laguerre – Gauss beam in a lossless LHM is always opposite to the transverse energy flow. Finally, we theoretically study the role of dispersion in propagation of rotating Hermite-Gaussian (RHG) beams in left-handed materials (LHMs).
当考虑介质的损耗时多模拉盖尔-高斯光束的角动量密度方向可以平行或反平行于横向能流方向。最后，研究了左手介质的色散特性对旋转厄米-高斯光束的影响。
In addition, we find that the angular momentum density can be parallel or antiparallel to the transverse energy flow in LHM, while the angular momentum flow is always opposite to the transverse energy flow.
此外，发现左手介质中旋转厄米-高斯光束的角动量密度方向与横向能流方向为平行或反平行的关系，而角动量流的方向始终与横向能流方向相反。
In sports biomechanics and physical statistics there are many concepts and principles dealing with physics and mathematics such as free degree, principle of conservation of angular momentum, probability density function, principle of little probability event.
在运动生物力学和体育统计中，有许多物理学及数学的概念和原理，例如自由度、动量矩守恒原理、概率密度函数、小概率事件原理等。
When the exciton system closes to the statistical equilibrium, this exciton state density automatically approaches to the Fermi-gas nuclear level density with angular momentum.
当激子系统趋近统计平衡时，该公式就自动过渡到具有角动量的费米气能级密度公式。
A New density operator formalism for describing high-spin nuclei systems-angular momentum product operator and Z operator was proposed.
本文提出了Z算符与角动量积算符相结合的广义积算符，用于描述高自旋弱耦合系统NMR实验谱。
And the relationships of the positron lifetime and the local electron density, that of the Doppler line shape, the angular correlation and the distribution of electron momentum density, Fermi planes are analyzed respectively.
分析了在该体系中正电子寿命参量与局域电子密度、多普勒线形参量和角关联参量与电子动量密度分布和费米面之关联。
Further investigation on the orbital angular momentum distribution in nuclei and nuclear density
原子核内轨道角动量分布与核密度的进一步探讨