Al-X谱线电子碰撞展宽的理论研究

 使用R-矩阵方法和半经验方法,计算了高价离子Al-X 2s^{2 1}S-2s2p¹P⁰共振谱线在电子密度为10¹⁷cm^-3时的线宽和线移随温度的变化关系,两种计算得到的线宽结果符合得比较好。使用半经验方法可以获得大量谱线的电子碰撞展宽,以满足需要大量数据的等离子体不透明度的计算的需要。使用半经验方法同时得到了其它一些谱线的电子碰撞宽度。     

Nonlinear dynamics in sliding processes： the single-particle case

Dynamical behaviours of the motion of particles in a periodic potential under a constant driving velocity by a spring at one end are explored. In the stationary case, the stable equilibrium position of the particle experiences an elasticity instability transition. When the driving velocity is nonzero, depending on the elasticity coefficient and the pulling velocity, the system exhibits complicated and interesting dynamics, such as periodic and chaotic motions. The results obtained here may shed light on studies of dynamical processes in sliding friction.     

Entanglement swapping with atoms separated by long distance

This paper proposes a scheme for entanglement swapping based on cavity QED. The two atoms to be entanglement-swapped can be separated over long distance. The scheme is a non-post-selection one with the success probability of 1/2.     

对高校体育系乒乓球教学考核方法的探讨

采用实验法和数理统计法,对体育系乒乓球选修课的考试方法进行研究,按照乒乓球教学大纲的要求,制定出以考查推挡技术,搓球技术,正手攻技术和左推右攻为内容,从达标与技评两方面具体考评,为普通高校乒乓球教学改革提供考核方法,以丰富体育教学体系。     

全球化中我国对外开放的空间演化特征及其决策选择

从世界各经济之间的相互联系、相互作用的研究视角,对中国步入全球化进程中不断推进国内外商品、资本、技术、信息等国际经济要素加速转移的空间演化态势的特殊内涵,着重从其空间跨越性、空间汇敛性、空间依存性等三个主要方面加以揭示与评价,并对中国的相关适应决策选择了初步探讨。     

DTA模型计算高温Mg等离子体的辐射不透明度

使用DTA(detailedtermaccounting)模型计算了温度为 5 6eV、密度为 0 .0 1g/cm3 的Mg等离子体的辐射不透明度以及Rosseland和Planck平均不透明度 .对于处于局域热动平衡 (LTE)下的Mg等离子体 ,利用Saha方程计算出各价离子的丰度 .MCHF方法得到Mg各价离子的能级以及束缚 束缚跃迁的振子强度 ,考虑了Doppler展宽和碰撞展宽 ,谱线线型采用Voigt线型 .束缚 自由以及自由 自由吸收截面使用AA模型得到. The spectral resolved opacity of high temperature Mg plasma at a temperature of 56 eV and a density of 0.01 g/cm 3 is calculated by the detailed term accounting (DTA) model. Saha equation is applied to obtain the population distribution of the plasma in local thermodynamic equilibrium. Atom levels and bound-bound absorption oscillator strengths are obtained from a multi-configuration Hartree-Fock (MCHF) calculation that includes Breit-Pauli relativistic correction. After ...     

稠密、冷铝等离子体的辐射不透明度研究

使用细致谱项模型、联合组态相互作用方法和R 矩阵方法计算了处于局域热动平衡条件下的稠密、冷铝等离子体的辐射不透明度 .组态相互作用方法用于获得束缚 束缚吸收截面所需要的偶极跃迁振子强度 ,R矩阵方法用于获得光电离截面 .对于温度在 6— 12eV、密度为 0 .36mg/cm3 的铝等离子体 ,计算得到的吸收系数在波长为 0 .35 1,0 .5 2 7和 1.0 5 4 μm处与实验结果符合较好 ,而温度在 3— 6eV时 ,理论计算比实验结果大. The radiative opacity has been investigated by using detailed term accounting approximation for dense, cold aluminum plasmas under local thermodynamic equilibrium. The configuration interaction scheme has been used to obtain the relevant atomic parameters for bound-bound absorption, such as excitation energies and oscillator strengths. R-matrix method has been used to obtain the photoionization cross sections. For aluminum plasmas of density 0.36 mg/cm 3, temperature of 6-12 eV, the...     

非化学计量比铌酸钾锂晶体的光谱特征

用顶部籽晶法生长了一批不同组成的铌酸钾锂晶体。利用近红外cw: Ti-sapphire激光研究了三种组成的经过精细抛光的晶体样品的二次谐波性质,结果表明晶体的二次谐波效应与晶体组成密切相关,Li含量越高的样品倍频效率越高。利用红外Raman光谱技术调查了晶体非线性晶格振动特征,分析了晶体中组分离子浓度对晶体红外Raman光谱特征的影响,探讨了组分离子对晶体二次谐波性质影响的原因。结果表明,晶体中位于C格位的Li离子浓度对晶体Raman光谱产生了强烈的影响,低Li含量晶体中[NbO₆]7-八面体所对应的3个Raman特征光谱线没有峰发生分裂;当晶体中Li离子浓度增加时,ν₅所对应的Raman峰有所加宽,ν₂振动模式出现分裂峰,并在100～400 cm-1范围出现小峰数量增多;当Li离子浓度接近铁电相边界时,[NbO₆]7-八面体结构接近解体,ν₅所对应的Raman峰分裂成3个峰,ν₁和ν₂振动模式发生部分分裂,在100～400 cm-1范围小峰更为突出。这些影响的本质在于晶体中Li含量的提高导致晶体中[NbO₆]7-八面体畸变程度加大,与晶体非线性光学性质相一致。     

High-order harmonic generation spectrum of an excited one-dimensional Coulomb atom in an intense laser field

Response of the wave packet of a one-dimensional Coulomb atom to an intense laser field is calculated using the symmetrized split operator fast Fourier method. The high-order harmonic generation (HHG) of the initial state separately being the ground and excited states is presented. When the hardness parameter \alpha in the soft Coulomb potential V(x)=-1/\sqrt{x^2+\alpha} is chosen to be small enough, the so-called hard Coulomb potential V(x)=-1/|x| can be obtained. It is well known that the hard one-dimensional Coulomb atom has an unstable ground state with an energy eigenvalue of $\sim0.5$ and it has no states corresponding to physical states in the true atoms, and has the first and second excited states being degenerate. The parity effects on the HHG can be seen from the first and second excited states of the hard one-dimensional Coulomb atom. The HHG spectra of the excited states from both the soft and hard Coulomb atom models are shown to have more complex structures and to be much stronger than the corresponding HHG spectrum of the ground state of the soft Coulomb model with $\alpha=2$ in the same laser field. Laser-induced non-resonant one-photon emission is also observed.     

基于金纳米粒子的QCM实时检测DNA错配的研究

利用石英晶体微天平（QCM）技术,用双硫醇分子作为连接剂,将金纳米粒子固定于金电极表面,以人类p53基因片断为DNA探针,研究了其在QCM金电极表面的固定、杂交和错配,重点探讨了金纳米粒子修饰的DNA错配碱基个数和错配位点对杂交的影响。在实验条件下,金纳米粒子在QCM金电极表面的修饰使其灵敏度得到了明显提高;而且,错配碱基个数和错配碱基位点的差异都对杂交产生了不同程度的影响。