Solitary Wave Solutions of Triple Sine-Gordon Equation

Through a mapping relation between the triple sine-Gordon and Ф5 model, we discuss the equation in detail. A series of solitary wave solutions for the triple sine-Gordon equation is obtained by the existing ones of the Ф5 model. Some detailed solitary wave solutions are given for some special coefficients which have significance in physics.     

纳米X1-Y2SiO5∶Eu的制备与格位选择激发下的光致发光研究

采用溶胶-凝胶法制备了纳米微晶X₁-Y₂SiO₅∶Eu，研究了室温和15K下的光致发光特性.透射电子显微镜的测量结果表明，样品的平均粒径为50nm.通过低温下的格位选择激发，分别得到X₁-Y₂SiO₅∶Eu中两种格位的Eu³⁺离子各自的光致发光光谱，确定了谱峰位置.在格位选择激发下，两种格位的发光衰减均呈很好的单指数关系，⁵D关键词：     

KBBF与B2O3的FT—IR研究

本文用ＦＴ－ＩＲ研究了不同组成的ＫＢＢＦ与Ｂ２Ｏ３的红外谱图，得出了Ｂ２Ｏ３含量对有关谱线强度比的定量曲线，这对ＫＢＢＦ晶体的制备具有一定的参考价。     

Comparative study of coherent terahertz emission from Fe/Pt ferromagnetic heterostructures

The ultrafast spin dynamic of in-plane magnetized Fe/Pt films was investigated by terahertz emission spectroscopy. The amplitude of the emitted terahertz wave is proportional to the intensity of the exciting laser beams.Both the amplitude and polarity of the terahertz wave can be adjusted by modifying the external magnetic field.The dependency of the amplitude on external magnetic fields is coincident to the hysteresis loops of the sample.Also, the polarity of the terahertz wave is reversed, as the magnetization orientation is reversed. The superdiffusive transient spin current with an inverse spin Hall effect is attributed to the main mechanism of the terahertz emission.     

Photopolymerization-Induced Two-Beam Coupling and Light-Induced Scattering in Polymethyl Methacrylate

Light amplification due to two-beam coupling is realized in doped polymethyl methacrylate （PMMA） glasses. A coupling gain as large as 14 cm^-1 is obtained. The dynamic behaviour of absorption and light-induced scattering due to the process of photopolymerization are also studied. The results show that the amplification and its dynamic process enable possible applications of PMMA in optical devices.     

稀土,镁对球墨可锻铸铁石墨化的作用

球墨可锻铸铁是近年来发展的一种新型结构材料。本文研究了稀、镁残留量对球墨可锻铸铁退火石墨球数、第一阶段石墨化时间和铁素体化率的影响，同时，分析了稀土、镁硫化物在石墨化过程中的作用。结果表明，稀土、镁残留量对球墨可锻铸铁退火石墨和第一阶段石墨化时间有显著的影响，而对第二阶段石墨化时间影响不大；在球墨可锻铸铁铸态白口组织存在大量球状稀土镁硫化物，它可以作为第一阶段退火石墨的结晶核心。     

刚球粒子碰撞频率和距离关系的计算机模拟

用Montecallo方法模拟了由两个刚球粒子组成的体系，得到了碰撞频率和粒子间距的定量关系。模拟结果显示，碰撞频率随着粒子间距的增大急剧下降。这一特性为文献[1]中描述的两个粒子体系的聚集过程的碰撞反应动力学提供了有用的旁证。