Computation and asymptotic analysis in the impact problem

Non-linear numerical method is applied to solve the viscous-elastic-plastic material impact problem. The finite element simulation agrees with the celebrated European crash safety analysis. The complex material stress distribution in the large deformation has been obtained, when the impact happens. Also the posteriorestimate solver and asymptotic analysis have been used for the sensitive pre-stage deformation before the impact happening. This part of simulation is very interesting for the passive safety in automotive protection devices. It is an important part of the mathematical modelling. Supported by the National Natural Science Foundation of China (No. 10871225), Partly supported by EInstitutes of Shanghai Municipal Education Commission, N.E03004; Partly supported by Shanghai Pu Jiang Telent project [2006]118.     

Development of New Type Multi-Elements Doped Carbon-Base Plasma Facing Materials

Carbon-base materials will be major plasma facing materials (PFM) in a fusion device in near term and even in the future in spite of its high tritium trapping and chemical sputtering yield. Of course, the development of high Z PFM and free surface system are also important for fusion energy.     

Roles of Coulomb Interaction on Isospin Fractionation in Intermediate Energy Heavy Ion Collisions

As we know that in fact, nuclei offer an interesting isospin situation, where symmetry potential, Coulomb interaction and isospin dependent in-medium nucleon-nucleon collisions are simultaneously present. But, in general, the isospin effects of Coulomb interaction is not studied separately in more detail, even though the studies for the isospin effect of the isospin dependent mean field in the heavy ion collisions include automatically the role of Coulomb term. However the Coulomb interaction is an important asymmetry term, which can bring important isospin effect into the observable in the intermediate energy heavy ion collisions. The study for the role of Coulomb interaction on the isospin effects of observable in intermediate energy heavy ion collisions, is important for exploring isospin physics and setting up the equation of state for the isospin asymmetry nuclearmatter.     

超声波采油技术的原理及应用

文章介绍了超声波技术在油井增产，防蜡，防垢及除垢和对原油的降粘等方面的作用原理和作用效果，并说明了超声波采油的适用范围。     

低能电荷转移截面和高能转移电离研究(英文)

介绍了对于Na+ 离子和Rb(5s ,5p)原子碰撞中态选择单电子俘获微分截面的理论计算,并与实验数据进行比较,实验结果是离子与在磁光学阱中用激光冷却的碱金属靶原子碰撞而测量到的;还对高能量质子引起的He原子的转移电离进行了理论研究,在Shakeoff模型的基础上 ,分析解释了转移电离截面与单电子俘获截面的比值 ,并与最新实验结果作了比较. We report a theoretical study of state-selective differential single-electron capture cross sections between Na + and Rb(5s, 5p) atoms. The experimental data have been obtained with laser cooled target in a magnetic optical trap. We also report a theoretical study of transfer ionization of He by protons at high collision energies and analyze the transfer ionization cross section with respect to single electron capture cross section in terms of a shakeoff model.     

瞬态电子碰撞激发类氖锗19.6nm X射线激光的理论研究

近来，许多实验室仅采用一个脉宽为几个ps的短脉冲就得到了强放大的软X射线激光.这表明瞬态是来得及电离的.为此，在类氖锗的瞬态电子碰撞激发19.6nm 波长X射线激光研究中，提出了采用低预脉冲产生低电离度的预等离子体，后续一个ps级短脉冲既电离又加热等离子体的驱动方式.并用系列程序进行了模拟.模拟结果表明，这种驱动方式也可以得到高增益. 关键词： X射线激光 等离子体 增益系数 瞬态电子碰撞激发     

单原子气体分子碰撞动能及动量的平均交换率计算

根据统计规律,用刚性弹性球模型,讨论单原子分子气体分子碰撞的动量、动能交换问题,结果表明平均交换率均为三分之一。