49≤Z≤53类钴离子3d^9-3p^53d^10，3d^9-3d^84p跃迁谱线和振子强度的计算

用等电子序列高离化态离子能级△E随Zc的一般拟合公式,系统计算了中Z段49≤Z≤53类钴离子的能级,并给出了3d^9-3p^53d^10,3d^9-3d^84p跃迁的波长和振子强度。     

对象散全息元件产生的正交象散特性的研究

本文从理论上分析了用全息方法制作具有象散特征的一种光学元件——象散全息元件——的可能性,并得到实验上的证明.对由象散全息元件在空间正交方向上产生的象散特性作了较为仔细的研究,给出了实验结果.若用此元件代替普通象散系统,将具有使用方便,经济等优点.     

用锁相放大技术采集电子自旋共振信号

利用示波器通过电子顺磁共振波谱仪观察了DPPH样品中未偶电子的自旋共振信号,使用锁相放大技术采集了电子自旋共振信号的微分线,讨论了影响实验结果的因素,给出了相关的实验参数。分析发现,所采集到的微分线为典型的Guass线型,这与所使用固体试样中电子的周边环境是一致的,这从实验的角度实现了锁相放大器对电子自旋共振信号的采集。     

Experiments and analyses of a new type optical system for computed radiography

A new high-performance laser scanning system is designed. In this system, a scanning arm consisting of a pentagonal prism and a scanning object lens is used to replace the traditional Fθ lens, and a circular imaging plate transmission mechanism is specially designed in order to meet the requirement of the scanning arm. At the same time, the stimulation fluorescence can be obtained by the scanning arm. Some main factors that influence the spatial resolution and the performance of the laser scanner system are analyzed, and the analysis results are presented, which is helpful for further optimization design of the system. Experimental results indicate that the images obtained by the system have good visual effects and can meet the requirements of industrial inspection.     

Photoluminescence study of the annihilation process of donor-bound excitons in ZnO： observation of quantum mechanical interference

We report a photoluminescence observation of the coupling of donor-bound excitons and longitudinal optical phonons in high-quality ZnO crystals at 5 K. The first-order phonon Stockes line of donor-bound excitons exhibits a distinct asymmetric line shape with a clear dip at its higher energy side, suggesting that quantum mechanical interference occurs during the annihilation of donor-bound excitons. The donor binding energy is determined to be 49.3 meV from spectral featural.     

缘线匹配对非定常流动影响初探

为深化缘线匹配对叶轮机非定常流动影响的认识,本文以关注尾迹撞击叶表展向轨迹为出发点,围绕缘线匹配对叶轮机非定常流动及性能影响进行了初步数值探索.研究表明:不同缘线匹配时叶片整体性能参数具有不同的脉动水平;给定缘线匹配下,整体性能参数脉动幅值随工况几乎不变或变化很缓;在设计点为达到降低某种脉动目的而实施的缘线匹配在非设计点同样有效;尽管微弱,数值模拟中还发现缘线匹配对上游尾迹随流掺混产生影响;缘线匹配严重影响时均相关项量值水平,尤其在叶尖、叶根和前缘附近.     

Measurement of Gamma-Rays from 11ΛB and 12ΛC

From the ^12 C（π^＋,K^＋）^12 AC reaction the γ -rays of 261.6±0.24 ke V（7/2^＋ →5/2^＋）and 1481.7±0.7 ke V（1/2^＋ →5/2^＋） of ^11 A B,and 2667.3±2.8 keV（1^- 2 → 2^- 1）of ^12 A C hypernuclei have been identified using a large germanium detector array Hyperball2 at K6 beam line of KEK. The observed energies of the transitions 1481.7keV and 261.6 keV are significantly different from the values predicted by the shell model using the △ and SN parameters determined from the ^7 △ Li data.     

长周期光纤光栅的透射光谱特征

用Matlab编程的方法对长周期光纤光栅的透射光谱谱线特性进行了研究,数值模拟了长周期光纤光栅周期对光谱谱线的影响.研究结论为长周期光纤光栅的设计提供了理论依据.     

表面光学声子对柱形量子线中三次谐波振荡的影响

本文利用密度矩阵方法研究了表面光学声子对柱形量子线中三次谐波振荡的影响,并且导出了三次谐波振荡的表达式。然后,以GaAs柱形量子线为例作了数值计算。研究表明,当柱形量子线的横向半径d非常小时,电子和表面光学声子之间的耦合强度就非常大,表面光学声子对三次谐波振荡的影响就更强。