Electron Impact Excitation of Xenon from the Ground State and the Metastable State to the 5p57p Levels

Electron impact excitation cross sections from the ground state and the lowest metastable state 5p56s J=2 to the excited states of the 5p57p configuration of xenon are calculated systematically using the fully relativistic distorted wave method. Special attention is paid to the configuration interaction effects in the wave-function expansion of target states. The results are in good agreement with the recent experimental data by Jung et al. [Phys. Rev. A 80 （2009） 062708] over the measured energy range. These accurate theoretical results can be used in the modeling and diagnosis of plasmas containing xenon.     

Polarization and Angular Distribution of Ll X-Ray Following Inner-Shell 2p3/2 Photoionization of Magnesium-Like Ions

The inner-shell 2pa/2 photoionization and the subsequent decay of Mg-like Fe^14＋, Cd^36＋, W^62＋ and U^80＋ ions are studied theoretically within the multiconfiguration Dirac-Fock method and the density matrix theory. Special attention is paid to exploring the influence of the non-dipole terms which arise from the multipole expansion of the electron-photon interaction in the photoionization process. The results show that the non-dipole contribution to the total cross section, the magnetic sublevels cross section of the photoionization process, the degree of linear polarization and angular distribution of the subsequent characteristic x-ray radiation become more important with the increase of photons energy and atomic nuclear Z. Especially for the cross section and the degree of linear polarization, the non-dipole contribution arrives at 50% for U^80＋ at four time energy threshold units. However, for the angular distribution, the maximum contribution does not exceed 4%, even for U^80＋ ions.     

基于电磁耦合机构的非接触电能传输系统

基于非接触电能传输技术的研究,设计了非接触电能传输系统的供电机构、耦合机构和受电机构三大基本模块。对系统的整流滤波和高频逆变电路进行了仿真实验,整流输出电压波动小于6%,谐振逆变电路输出信号频率达1000Hz以上。采用低频信号发生器作为供电机构对系统进行了性能测试,给出了500Hz下的空气间隙与电压传输效率的实验关系曲线,随空气间隙增大,电压传输效率降低。     

SiC缓冲层对Si表面生长的ZnO薄膜结构和光电性能的改善

用脉冲激光沉积(PLD)技术制备了ZnO/SiC/Si和 ZnO/Si薄膜并制成了紫外探测器。利用X射线衍射(XRD),光致发光(PL)谱,I-V曲线和光电响应谱对薄膜的结构和光电性能进行了研究。实验结果表明:SiC缓冲层改善了ZnO薄膜的结晶质量和光电性能,其原因可能是SiC作为柔性衬底能够减少ZnO与Si 之间大的晶格失配和热失配导致的界面缺陷和界面态。     

FTIR结合生理特性研究镉胁迫对果灰藓的影响

苔藓植物可作为监测环境中重金属污染的指示植物。以苔藓植物果灰藓为实验材料,用不同浓度的重金属镉处理7 d后,借助傅里叶红外光谱法(FTIR)分析重金属镉胁迫下果灰藓各化学成分的变化,同时测定可溶性糖(SS)、可溶性蛋白(Pr)、丙二醛(MDA)含量在镉胁迫下的生理指标。结果表明：随着镉处理浓度的升高,可溶性糖含量和可溶性蛋白含量呈现先上升后下降的趋势,丙二醛含量先下降后上升。FTIR与果灰藓响应重金属镉胁迫的各生理指标变化趋势较一致,且FTIR比传统的生理指标测定更敏感、便捷。因此,FTIR可以作为研究苔藓植物应用于环境重金属污染监测的一种快速、有效的方法。     

光磁共振实验中扫场及水平场取值关系的探讨

在光磁共振实验中,常常有抽运信号与共振信号同时存在的情况,这严重影响到实验的观察和测量.本文利用扫场及水平场大小对抽运信号的影响,通过理论分析和实验测量得到抽运和共振信号不同时存在时扫场和水平场的取值关系.从而有效避免抽运信号对共振信号的干扰,以及对总磁场方向误判的情况,保证了实验的顺利进行和准确测量.     

马丙共聚物吸附剂的制备及吸附性能的ICP-AES法研究

以马来酸酐和丙烯酰胺为功能单体,N,N-亚甲基双丙烯酰胺为交联剂,过硫酸铵为引发剂合成了马来酸酐、丙烯酰胺共聚物吸附剂P(MA-AM)。用傅里叶变换红外光谱(FTIR)和热重分析对共聚物进行了表征,并采用电感耦合等离子体原子发射光谱(ICP-AES)法研究了共聚物的吸附性能和选择性;结果表明,在pH 3.5时,P(MA-AM)对Fe3+具有很高的选择性,1 h达吸附平衡,其饱和吸附量为78.81 mg·g-1;Fe3+的吸附过程符合准二级反应动力学模型,吸附模型可以用Freundlich等温吸附来描述,该吸附为吸热过程。     

探照灯光斑移动现象的再讨论

指出用传统的"平行线"模型和光速有限来解释光斑移动现象,当将情况推广到极限时,会出现一些局限,并提出了一种新的与实际情况更符合的"同心圆"模型,由此可以解释光斑移动现象.     

Experimental Study on Soft X-ray Contact Microscopy for Biological Specimens

Using Hefei Synchrotron radiation as X-ray source and photoresist PMMA as recording medium, soft X-ray contact microscopic imaging experiment on hydrated leaf epidermal cells of a kind of dicotyledon is performed and its latent image is read out by a light microscope. Several main factors degrading the resolution of the image are discussed in detail.     

Induced electric fields and plasmonic interactions between a metallic nanotube and a thin metallic film

We have numerically simulated the induced electric fields and the plasmonic interactions of a metallic nanotube near a thin metallic film. Our study shows that the energies and intensities of the plasmon resonances depend strongly on the aspect ratio (the ratio of the inner to outer radius) of the nanotube as well as the separation between the center of the nanotube and the upper surface of the metallic film and the thickness of the film. The enhancement of the induced electric field of this system reaches ...