高密度平面靶等离子体中激光驱动冲击波加速离子的能谱展宽

本文对超短超强激光脉冲辐照高密度等离子体产生的静电冲击波加速离子的能谱展宽机理进行了数值研究.着重讨论了三种冲击波加速离子的能谱展宽机理:能量沉积到离子中使得冲击波前沿不断减速,被加速离子与背景粒子的碰撞,以及高能离子到达靶背面时受到鞘层场进一步加速.还研究了驱动激光脉冲宽度对冲击波加速离子能谱宽度的影响. 关键词： 激光等离子体 冲击波加速 能谱展宽     

∧c^＊ in a coupled-channel baryon-meson scattering

Possible structures and properties of some excited states of Λ_c⁺ dynamically generated in the coupled-channel P-wave meson-baryon scattering are studied by solving the Bethe-Salpeter(BS) equation in the framework of the Chiral Unitary Approach. It is shown that both Λ_c⁺(2765) and Λ_c⁺(2940) could be generated dynamically and could be compound states with multi-configuration molecular-like structures. The couplings of the generated states to various reaction channels are also calculated. Moreover, two highly excited states, Λ_c⁺(3024) and Λ_c⁺(3134), are predicted.     

Theoretical investigation of encapsulation processes of C60 into single-wall carbon nanotubes

The encapsulation of C₆₀ into single-wall carbon nanotubes is systematically studied by tight-binding molecular dynamics method with an appropriate long-range Lennard-Jones potentials. For a (16,0) nanotube, it is impossible to encapsulate C₆₀ into the tube because of a much larger energy barrier with the relaxation of the open end.     

An extension of the Noether theorem: Accompanying equations possessing conservation laws

It is shown that the Noether theorem can be extended for some equations associated (accompanying) with Euler–Lagrange equation. Each symmetry of Lagrangian yields a class of accompanying equations possessing conservation law (first integral).The generalization is done for canonical Hamiltonian equations as well.     

Cladding-ring-equivalent effective index method for analyzing the propagation characteristics of multi-cladding photonic crystal fibers

Cladding-ring-equivalent effective index method (CREEIM) is proposed to analyze the propagation characteristics in the multi-cladding photonic crystal fibers (MCPCFs). The effective indices and dispersions of the step index two and three-cladding structures are calculated with the Sellmeier formula. The accuracy of CREEIM is competitive to the results calculated by the multipole method (MPM). With different structure parameters, the differences between two methods are evaluated with the relative error R_E of effective index and relative difference R_D of dispersion. This method is also used to analyze the mode cut-off and nonlinear characteristics in the three-cladding structure PCFs by calculating the mode effective index n_eff instead of complex mode field distribution.     

多粒子W态的多控制隐形传输

利用（N－1）个EPR对和一个（M＋2）量子比特的GHZ态来实现N粒子W态的M个控制隐形传输。当所有的控制方都对自己的粒子进行Hadamard操作和测量，并把测量结果告诉接受方，隐形传输成功实现；接着讨论了当一个控制方不合作，隐形传输失败。     

类克尔介质对二能级原子与压缩相干态相互作用的影响

通过研究原子反转和光子数统计分布,讨论包含类克尔介质的双光子二能级原子与压缩相干态相互作用的量予特性.结果表明,在类克尔介质与模场的耦合强度为原子与模场耦合强度的两倍以上时,原子与模场耦合的作用不明显.     

离焦散斑照相术的错位干涉特性及其应用

通过相关计算和滤波分析,得出了错位干涉的特性,并据此对散斑错位干涉术的应用进行了评论。