厚透镜近似下激光驻波场中原子动力学研究

研究了在厚透镜近似下 ,原子在激光驻波场中的动力学行为 .通过直接演化一维薛定谔方程 ,发现当激光的强度较大时 ,原子束将会聚焦形成几个焦点 .如果激光的强度更大 ,驻波场中的原子将会出现一种“隧道”现象 ,此时 ,原子受一些实验参数 (如焦平面位置、激光强度等 )的影响程度将大大降低 .这种现象有利于提高原子在驻波场中聚焦沉积的效果 . The dynamics of atoms in laser standing wave (SW) in the regime of over-focused immersion-lens is studied. Through directly evolving a one-dimensional Schrdinger equation, we find that multiple focusing appears when laser intensity is larger than that required for simple focusing. If laser intensity is much higher than that for the single focusing, a "channeling" phenomenon appears, which is insensitive to the variation of some parameters, such as focal plane position and laser intensity...     

Antibunching Effect of Eigenstates of the Operator bQ－K in a Q-Deformed Non-harmonic Oscillator

We introduce a quantum antibunching effect. The quantum antibunching effect of the K eigenstates of the K th powere (K≥3) of the annihilation operator in the Q-deformed non-harmonic oscillator is investigated. The physical meaning of the K states are explored. The results show that there is the quantum antibunching effect in all of those states. All of them can be generated by a linear superposition of generalized coherent states produced by the time-dependent Q-deformation non-harmonic oscillator at different instants.     

用新型的半固相方法合成掺钴尖晶石材料LiCo_xMn_(2-x)O_4及其性能研究

用一种新型的半固相法合成得到LiCo_xMn_(2-x)O_4材料,通过X射线衍射技术 和充放电实验对材料的结构及循环性能进行了研究。与传统的固相合成法相比,这 种半固相法显示了产物颗粒尺寸均匀,电化学性能良好的特点。通过对结构,组成 与电化学性能关系的探讨,对不同半固相法合成路线的选择及适当的优化,可得到 电化学性能良好的掺钴尖晶石材料,其中LiCo_(0.016)Mn_(1.984)O_4在室温下的 初始容量为118 mA·h/g,循环25周后,容量仍能保持在113 mA·h/g左右。通过这 种新型合成方法得到的掺钴尖晶石材料,在高温下也表现出了令人满意的充入电循 环性能。     

内置垫补线圈的C型二极磁铁

对HIRFL CSR的原形磁铁进行了试制和研究.尝试了一种新的改善磁场分布的方法:在不增大极头的条件下使用两根内置导线,实践证明是可行的.用OPERA 2D和TOSCA 3D软件分析了垫补电流对中、低场的影响,同时也介绍了这块C型二极磁铁的制作工艺及磁场测量结果. The C-type dipole prototypes in the injection beam line from a Separate Sector Cyclotron (SSC) to Cooling Storage Ring (CSR) are selected as R & D for CSR magnets fabrication, because they have large bending angle and small radius, and are very difficult to stack and fabricate. A method to obtain good field homogeneity has been attempted in the C-type dipole prototype. This method is not the enlarged dipole pole but two imbedded conductors and two small power supplies. This is easy operating....     

兰州重离子冷却储存环二极磁铁设计

介绍了兰州重离子冷却储存环主环(CSRm)的改进W型二极磁铁和实验环(CSRe)C型二极磁铁的磁场计算和物理设计,在降低了磁铁造价和运行费用的前提下设计参数达到或超过了物理要求.根据样机的加工和检测结果来看,所有的磁场计算和物理设计的结果是可靠的.Magnetic field calculation and design of CSRm modified W-type dipoles and of CSRe C-type dipoles are presented in this paper. Under the condition of lower cost, all of the designed parameters are better than required values. Now the prototype has been fabricated and also the magnetic field measurement has been done. According to the measured results, all the calculation and design are very reliable.     

用于氙灯阵列的渐开线翼面反射器

 用光线追踪法分析反射翼几何形状对氙灯反射器光传输效率的影响。提出一种新的反射器几何构型——仿渐开线型,其外形与标准渐开线相似,但翼展宽度短于标准渐开线反射器。用蒙特卡罗法模拟氙灯光能量在激光泵浦腔内的反射和吸收过程,计算结果显示：在合理选择反射翼的几何修正系数前提下,“仿渐开线型”反射器的光传输效率优于“短翼渐开线型”的光传输效率。在腔长、灯内径等设计约束条件受限的条件下,采用“仿渐开线”设计方法,能够最大限度地增大氙灯阵列输出的总泵浦能量。     

ICP-AES法测定金属钇中19个杂质元素

本文介绍了用ICP-AES法测定金属钇中19个杂质元素的方法,采用基体匹配法附基体干扰,一了金属钇中19个杂质元素的含量,得到了较好的精密度和准确度,方法简便,快速,结果令人满意.     

CO2的化学固定及碳酸亚烃酯的合成研究

报道了氯铝酞菁(PcAlCl)与n-BuPh3PBr, n-Bu4NBr, MePh3PI和n-Bu4NI等卤代季铵盐或季盐二元催化剂对CO2与环氧丙烷制备碳酸亚烃酯的环加成反应有明显的协同催化作用, 并初步探讨了其反应机理. 在100 ℃下, PcAlCl/n-BuPh3PBr的催化活性达360 mol/(mol*h), 选择性达99%; 而在同样条件下PcAlCl和n-BuPh3PBr单独对该反应的催化活性只有57 mol/(mol*h)和90 mol/(mol*h). 实验结果表明, PcAlCl与n-BuPh3PBr之间可能形成了1∶1型配合物, 导致催化活性显著增强.     

中能8B和9C与Si反应总截面的测量

能量为75MeV/u的¹²C初级束轰击2mm厚的初级Be靶,并利用RIBLL从弹核碎片中分离出54.2MeV/u质子滴线核束8B和61.1MeV/u的⁹C,再轰击Si靶,用透射法测量了它们与Si的反应总截面σ_R.并应用Glauber模型进行理论计算,分析结果表明⁸B和⁹C都可能具有质子晕结构.     

C60Pd（Ph2POCH2CH2OPPh2）的合成与光电转化性能

C60Pd（Ph2POCH2CH2OPPh2）的合成与光电转化性能;富勒烯;钯配合物;光电性能