类铍铝离子的Kα跃迁特性研究

我们报道了类Be的Al X最低40个能级的能级精细结构.利用基于多组态Dirac-Fock方程,我们给出了类Be的Al X的K_α跃迁的能级,波长,振子强度和能级寿命.研究表明,当前所得的理论计算结果与实验值以及其它理论值符合很好,同时对于分析已有的实验结果和指导拟开展的实验也有一定的意义.     

电离能下降对于硅等离子体辐射不透明度影响的研究

电离能下降的现象与等离子体的成分、电离分布、热力学、输运性质息息相关,其精确测量值对于整个实验的模型检验和方案设计都至关重要.本文考虑粒子数的涨落,对经典的Stewart和Pyatt的模型进行修正,并耦合进先前发展的等离子体模型.利用修正的模型对熊刚等人的实验进行了解释,发现当前模型所得结果要优于其他理论结果,与实验更加一致.     

Fractal Analysis of Surface Roughness of Particles in Porous Media

A fractal dimension for roughness height （RH） is introduced to characterize the degree of roughness or disorder of particle surface characters which significantly influence physical-chimerical processes in porous media. An analytical expression for the fractal dimension of RH on statistically self-similar fractal surfaces is derived and is expressed as a function of roughness parameters. The specific surface area （SSA） of porous materials with spherical particles is also derived, and the proposed fractal model for the SSA of particles with rough surfaces is expressed as a function of fractal dimension for RH and fractal dimension for particle size distribution, relative roughness of particle surface, and ratio of the minimum to the maximum particle diameters of spherical particles.     

类硼S离子K壳层激发共振态的辐射和俄歇跃迁

采用多组态鞍点变分方法计算了类硼S离子K壳层激发共振态1s2s~22p~2, 1s2s2p~3, 1s2p~(4 2,4)L(L=S, P,D)的非相对论能量和波函数,利用截断变分方法饱和波函数空间,改进体系的非相对论能量.利用微扰理论计算了相对论修正和质量极化效应,利用屏蔽的类氢公式计算了QED (quantum electrodynamics)效应和高阶相对论修正.进一步,考虑闭通道和开通道相互作用,计算了由俄歇共振效应引起的能级移动,从而得到了共振态的精确相对论能级.利用优化的波函数,计算了类硼S离子K壳层激发共振态的电偶极辐射跃迁的线强度、振子强度、跃迁率和跃迁波长.计算的振子强度和辐射跃迁率均给出了长度规范、速度规范、加速度规范的结果.三种规范结果的一致性表明了本文计算的波函数是足够精确的.利用鞍点复数转动方法计算了类硼S离子K壳层激发共振态的俄歇跃迁率、俄歇分支率和俄歇电子能量.本文的计算结果与其他文献数据符合较好.     

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介绍了类Be的ArⅩⅤ最低40个能级的能级精细结构.利用基于多组态Dirac-Fock方程,给出了类Be的ArⅩⅤ的Kα跃迁的能级、波长、振子强度和能级寿命.研究表明,当前所得的理论计算结果与实验值以及其它理论值符合很好,同时对于分析已有的实验结果和指导拟开展的实验也有一定的意义.     

Capillary Rise in a Single Tortuous Capillary

The impact of convolutedness of capillary on the capillary rise of wetting liquid in a single tortuous capillary is studied. By introducing tortuosity and fractal dimension for a tortuous capillary, analytical expression for time evolution of the height/weight of capillary rise is obtained. It is found that the accumulated weight of liquid imbibed into a single tortuous capillary is independent of the shape of a capillary in the early rising stage.     

A Model for the Contact Angle of Liquid Droplets on Rough Surfaces

Up to now, measured results of the contact angle on rough surfaces have been explained usually based on the Wenzel equation （1936） and the Cassie-Baxter equation （1944）. However, these equations do not take into account considerations of liquid wetting behaviors on rough surfaces, and this leads to poor understanding of the mechanisms of contact between liquid droplets and rough surfaces （e.g. contact angle hysteresis）. We propose a new model for the contact angle of liquid droplets. By means of the present model, we can well understand the evperimental data which could not be well explained by the Wenzel equation and the Cassie-Baxter equation.