高阶色散下啁啾孤子的演化特性

本文解析地研究初始注入光纤的带啁啾Sech形脉冲(1≠N<3/2)的演化特性。在文献5的基础上,主要利用变分原理,同时把高阶色散项作为摄动项,近似求解了脉冲振幅、脉宽以及频率啁啾参数随传输距离的演化方程。结果表明,高阶色散有助于光纤中渐近孤子的形成。     

螯合树脂研究──ⅩⅩⅦ·巯基胺型螯合树脂的化学改性及其吸附性能

巯基胺型螯合树脂经烷氧基环硫丙烷和二烷基胺基环硫丙烷改性后。合成了一系列新的螫合树脂．这些树脂与原树脂相比，对贵金属离子的吸附性能有一定的改善．特别是用二烷基胺基环硫丙烷改性后的树脂，效果更为明显．还讨论了树脂结构与吸附性能之间的关系．     

1，1’－联－2－萘酚硼烷的辛可宁和麻黄碱衍生物的合成

１，１’－联－２－萘酚硼烷的辛可宁和麻黄碱衍生物的合成单自兴，孙杰，段标，杨洗，赵德杰（武汉大学化学系，武汉，４３００７２）关键词１，１’－联－２－萘酚，硼烷，辛可宁，麻黄碱，硼烷配合物，合成中国法分类号Ｏ６２７·３１ｌ，ｌ’一联一２一条酚在大环化学...     

我国空间物理学先驱桂质廷──纪念桂质廷教授100周年华诞

桂质廷（１８９５～１９６１），我国著名的地球物理学家．他是建国初期中国科学院地球物理组专门委员，第一个巡测了我国境内地磁常量的中国人．他最先和学生一道在国内进行了高空电离层的常规观测．他所创建的武汉大学游离层实验室，５０年来未曾间断电离层的观测研究．本文着重介绍他的生平简历、教学态度、学术成就和爱国主义思想．     

碱存在下二烷基硼酸甲酯与氯仿的相转移反应研究

由烯烃经一氯硼烷甲硫醚（Ｈ２ＢＣｌ·ＳＭｅ２）硼氢化和甲醇解制得的二烷基硼酸甲酯６，在５０％ＮａＯＨ和相转移催化剂（ＴＥＢＡ）存在下与氯仿反应，继之氧化，获得了相应的二烷基酮１，二环烷基酮２和３以及脂环酮４．考查了各种参数对反应的影响．讨论了反应机理，为从烯烃出发合成各种类型的酮提供了一条简便新途径．     

Laser induced fluorescence of CdHg excimer

The fluorescence of CdHg excimer has been observed over the spectral range 220-320 nm for temperature between 660-820K. The spectra were excited in a Cd-Hg mixture contained in a quartz vapor cell by laser pulses at 326.1nm. The peaks of these bands are at about 232, 256 and 286 nm respectively. An interpretation has been given out according to the potential-energy curves.     

Effect of local structure on electron paramagnetic resonance spectra for trigonal [Cr(H2O)6]3+coordination complex in the sulfate alums series: a ligand field theory study

A simple theoretical method is introduced for studying the interrelation between electronic and molecular structures.By diagonalizing the 120 × 120 complete energy matrices,the relationships between zero-field splitting(ZFS) parameter D and local distortion parameter △θ for Cr 3+ ions doped,separately,in α-and β-alums are investigated.Our results indicate that there exists an approximately linear relationship between D and △θ in a temperature range 4.2-297 K and the signs of D and △θ are opposite to each other.Moreover,in order to understand the contribution of spin-orbit coupling coefficient ζ to ZFS parameter D,the relation between D and ζ is also discussed.     

光场显微镜实现裸眼三维实时显示

提出了一种将光场显微镜与裸眼三维显示技术相结合的方法,实现了利用光场显微镜对微观样品进行三维裸眼实时观察的技术。该技术将光场显微镜得到的子图像阵列直接投影在微透镜阵列的焦平面上,在空间一定区域内双眼可分别观看到两幅不同视角图像,使观察者产生立体视觉。该系统具有结构简单,无需相干光源,无需佩戴特殊眼镜,可多人同时观看等优点,应用前景广泛。     

Simultaneous spectrum and coherent combining by active phasing dual two-tone all-fiber MOPA chains

We present a new approach for simultaneous spectral and coherent combining in a master oscillator power amplifier (MOPA) configuration with active phasing. Spectrally combined single-frequency seed lasers are employed as a master oscillator for the all-fiber power amplifier chain, which provides robust performance suppressing of the stimulated Brillouin scattering effect, while coherent combining of spectrally combined amplifiers with active phase control provides stable in-phase combining, despite the strong phase fluctuation. In experiments, two spectrally combined seed MOPA chains are coherently combined with a total output power of 390 W. The power of the main lobe in the closed loop is two times of that value in the open loop, and visibility of more than 75% of the long-exposure interference pattern at the receiving plane is obtained.     

Rapid thermal annealing effects on the structural and optical properties of Na–N codoped ZnO films

Polycrystalline ZnO thin films codoped with Na and N were obtained by chemical bath deposition. The structural characteristic and the optical properties of the rapid thermal annealed ZnO:(Na,N) films were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive spectrometer (EDS), Raman spectrum and room-temperature photoluminescence. After RTA treatment, the XRD spectra showed a continuous decrease of the full- width at half-maximum (FWHM) of the (0 0 2) diffraction peak of the ZnO:(Na,N) film. The Raman spectra revealed that the intensity of the mode around 582 cm⁻¹ increased with the increase of the RTA temperature. The PL spectra showed different trends in the UV luminescence of ZnO:(Na,N) films after RTA treatments.