Generation of four-particle GHZ states in bimodal cavity QED

We propose a scheme for preparing four-particle Greenberger--Horne--Zeilinger states using two identical bimodal cavities, each supports two modes with different frequencies. This scheme is an alternative to another published work [Christopher C Gerry 1996 {\it Phys. Rev.} A {\bf 53} 4591]. Comparisons between them are discussed. The fidelity and the probability of success influenced by cavity decay for the generated states are also considered.     

Generation of Multi-atom Entanglement of Greenberger-Horne-Zeilinger and W States in Cavity QED

A method to prepare multi-particle entanglement of Greenberger-Horne-Zeilinger-type and W-type is proposed through the interaction between the cavity and many atoms simultaneously . After suitable interaction, the selected measurements on the cavity field can create the entangled atomic states. These entangled states can be useful for quantum information manipulation and fundamental study of quantum theory. These states that violate the Bell‘s inequality are proven.     

Simulation for double shell pinch

Basic shock phenomena are presented in a composite pinch, a hybrid of the Z-pinch. The successive transfer of current within the plasma structure is demonstrated by our calculations. Properties of the shock wave are described.The current distribution between the two shells after the outer shell hitting the inner shell is also discussed.     

动态柱形空穴膨胀模型及其在侵彻问题中的应用

 在侵彻问题中的应用进行了研究。通过采用相似变换求解塑性区控制方程,获得了动态柱形空穴膨胀中的弹塑性界面速度、径向应力分布、空穴表面应力的解。基于柱形空穴模型,推导了侵彻方程,并将其得到的预测结果与侵彻实验数据进行了比较。结果表明,模型的理论解与现有数据吻合得很好。 结果还显示了材料的可压缩性和塑性强化模量对柱形空穴膨胀以及侵彻阻力的影响。     

Multiparty Quantum Secret Sharing of Classical Message using Cavity Quantum Electrodynamic System

An experimental feasible scheme of multiparty secret sharing of classical messages is proposed, based on a cavity quantum electrodynamic system. The secret messages are imposed on atomic Bell states initially in the sender＇s possession by local unitary operations. By swapping quantum entanglement of atomic Bell states, the secret messages are split into several parts and each part is distributed to a separate party. In this case, any subset of the entire party group can not read out the secret message but the entirety via mutual cooperations. In this scheme, to discriminate atomic Bell states, additional classical fields are employed besides the same highlydetuned single-mode cavities used to prepare atomic Bell states. This scheme is insensitive to the cavity decay and the thermal field, and usual joint Bell-state measurements are unnecessary.     

激光间接驱动聚变柱菜腔靶内壁光斑参数计算

用几何光学计算了柱形腔壁上的激光光斑参数，包括光斑的位置、形状、大小以及光斑内的光强分布，同时还计算了在激光注入孔的光斑参数，这对分析靶丸的初始辐射均匀性、确定腔壁上的辐照强度大小民能否将激光有效地注入腔内都是非常重要的。     

无机盐对β-环糊精空腔微环境影响的荧光探针研究

基于芘的单体荧光光谱振动结构与其所处环境极性的相关性, 研究了碱金属氯化物对β-环糊精(β-CD)空腔微环境的影响。盐类的引入导致β-CD空腔极性减小, 芘/β-CD包络物形成常数增大。结果表明疏水相互作用是包络物形成动力之一; 盐类的引入除改变溶液的离子强度, 还与β-CD分子间存在着特殊的相互作用, 后者是导致环糊精空腔性质变化的根本原因。详细探讨了盐与β-CD分子间的作用本质。     

亚砜萃取有机酸机理的研究

用双对数法测出酒石酸石油亚砜萃合物的在观结构,并用红外光谱证明酸与亚砜以氢键相连。利用场解吸质谱可直接观察到有机酸亚砜萃合物的分子离子和准分子离子,比较多种有机酸纸层析的R_f值发现,亚砜萃取有机酸的机理中空腔效应起着重要作用。     

纳米空腔堆积的一维碳纳米结构的合成与表征

Quasi-periodically intermittent hollow-cavity-stacked one-dimensional carbon nanostructures were obtained by microwave plasma chemical vapor deposition from the mixture of CH₄ and N₂ on Fe/γ-Al₂O₃ catalyst. This structure was characterized by transmission electron microscope (TEM), high-resolution TEM and X-ray energy dispersive spectral analysis. The results indicate that the trace impurity of nitrogen might account mainly for the formation of these novel nanostructures. The structural units in these one-dimensional carbon nanostructures are full of nanocavities, which may be of potential importance in hydrogen storage.     

混凝土靶侵彻过程中空腔膨胀响应分区

利用LS-DYNA有限元软件对刚性弹正侵彻混凝土靶进行数值模拟，以混凝土极限压应变和极限拉应变两阈值为依据，对侵彻过程中混凝土靶空腔膨胀响应区域进行了识别划分，得到了侵彻过程中混凝土各响应区的区域大小。另外，还讨论了弹体侵彻速度对混凝土粉碎区和破裂区的影响，以及粉碎区和破裂区边界膨胀速度分别与侵彻速度的关系。计算结果表明，随着弹体侵彻速度的增大，混凝土粉碎区和破裂区界面速度都增大，粉碎区半径增大，而破裂区半径却减小；当侵彻速度达到某一特定值时，破裂区将会消失。