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A simple qualitative model, a generalization of the wellknown Hamel model [6], suitable for any gas density ratio is constructed; a passage in the limit to the strong collision model is demonstrated.


The effect of the velocity (v) dependence of the transport collision frequency νtrv on the Dicke line narrowing is analyzed in terms of the strongcollision model generalized to velocitydependent collision frequencies (the socalled kangaroo model).


The ion interaction with plasma and the velocitychanging Coulomb scattering are taken into account within the weakcollision model.


127, 320 (2005)] in the framework of the strongcollision model are not connected with a particular model of collisions and have a universal nature.


An elastic collision model baed on data given by Danon et al.

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 In order to study the effect of the gravitational instability in the formation and evolution of giant molecular cloud models (GMCs) in galaxies, the differential rotation models are developed by means of computer simulation methods. In addition to the collision between clouds, both the forces induced by the background potential of star disk and the selfgravity among molecular clouds are involved. As for the selfgravity, the short range (random collision model) and longrange selfgravity (gravitational instability... In order to study the effect of the gravitational instability in the formation and evolution of giant molecular cloud models (GMCs) in galaxies, the differential rotation models are developed by means of computer simulation methods. In addition to the collision between clouds, both the forces induced by the background potential of star disk and the selfgravity among molecular clouds are involved. As for the selfgravity, the short range (random collision model) and longrange selfgravity (gravitational instability model) among clouds is considered respectively. The results obtained are summarized as follows: The gravitational instability plays a key positive role in the aggregation formation of GMCs for the differential rotation model, and can speed up the clumping of GMC to form more massive GMCs.  为了研究引力不稳定性在巨分子云形成中的作用，通过计算机模拟技术建立了星系中分子云的较差自转模型.在演化中除了分子云之间的碰撞外，模型还考虑了分子云在恒星盘的背景引力场中所受的引力和分子云之间的相互自引力.其中分别考虑分子云之间的短程力(随机碰撞模型)和长程力(引力不稳定性模型).通过对计算机模拟的结果进行详细的分析和讨论,得到了以下结果：对于较差自转模型,引力不稳定性在巨分子云的聚合形成中起了关键的积极作用，它能够加速和加大分子云的成团.  The properties of the differential scattering section based on the inverse multiphoton nonlinear Compton scattering in strong magnetic field is studied using an inelastic collision model of electron with photons. An expression for the differential scattering section between a relativistic electron and photons in derived. It is shown the differential scattering section of scattered photons is reduced by the electron absorption photons number n at the same time and collision no elastic ξ increase between electron... The properties of the differential scattering section based on the inverse multiphoton nonlinear Compton scattering in strong magnetic field is studied using an inelastic collision model of electron with photons. An expression for the differential scattering section between a relativistic electron and photons in derived. It is shown the differential scattering section of scattered photons is reduced by the electron absorption photons number n at the same time and collision no elastic ξ increase between electron and photons, and the frequency of scattered photons slowly approaches resonance frequency, but it is not this frequency; In extraintense stationary laser field, when multiphoton nonlinear Compton scattering is token between relativistic electron and photons, and electron is captured by the laser field ,the differential scattering section is a constant.  应用电子与光子非弹性碰撞模型,分析、计算了磁逆多光子非线性Compton微分散射截面的特性。结果表明:该微分散射截面随与电子同时作用光子数及电子与光子碰撞非弹性成分的增大而减小,散射光子的频率逐渐趋于共振频率,但不具有共振性;当电子被光场俘获时,磁逆多光子非线性Compton微分散射截面为一恒定值。  >=The properties of the differential scattering section based on the inverse multiphoton nonlinear Compton scattering in strong magnetic field is studied using an inelastic collision model of electron with photons. An expression for the differential scattering section between a relativistic electron and photons in derived. It is shown the differential scattering section of scattered photons is reduced by the electron absorption photons number n at the same time and collision no elastic ξ increase between electron... >=The properties of the differential scattering section based on the inverse multiphoton nonlinear Compton scattering in strong magnetic field is studied using an inelastic collision model of electron with photons. An expression for the differential scattering section between a relativistic electron and photons in derived. It is shown the differential scattering section of scattered photons is reduced by the electron absorption photons number n at the same time and collision no elastic ξ increase between electron and photons, and the frequency of scattered photons slowly approaches resonance frequency, but it is not this frequency; In extraintense stationary laser field, when multiphoton nonlinear Compton scattering is token between relativistic electron and photons, and electron is captured by the laser field ,the differential scattering section is a constant.  应用电子与光子非弹性碰撞模型,分析、计算了磁逆多光子非线性Compton微分散射截面的特性。结果表明:该微分散射截面随与电子同时作用光子数及电子与光子碰撞非弹性成分的增大而减小,散射光子的频率逐渐趋于共振频率,但不具有共振性;当电子被光场俘获时,磁逆多光子非线性Compton微分散射截面为一恒定值。  
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