By using Gaussian variational method,the authors calculate dispersion relations of acoustic and optical phonons non-perturbatively based on Ginzburg-Landau model with lowest Landau level approximation.
作者从Ginburg-Landau模型出发,对二类超导体最低Landau能级近似模型中,使用改进的高斯变分法,非微扰地计算了声学声子模和声学光子模的色散关系。
For the extrusion process with specific screw configuration and material, the influencing factors are summed to six ones, which are investigated by the phase change fraction method respectively.
双螺杆挤出过程中影响聚合物颗粒熔融的因素众多 ,本文针对螺杆构型和几何尺寸、运转条件及物料确定的双螺杆挤出过程 ,将影响聚合物颗粒熔融的因素归纳为六个方面 ,利用相变分数法对这些影响因素分别进行了探讨。