无限包层Bragg光纤的传输模式研究

分析得到了横向电场分量和磁场分量所满足的耦合方程,对于介质折射率的不连续处,采用严格的边界条件来处理。基于全矢量模型,使用有限差分法编写了复模式的求解器,并将其应用于Bragg光纤的模式求解和分析。绘制出了Bragg光纤模式谱图,分类分析了在无限包层情况下Bragg光纤模式的基本特性。     

A New Exactly Solvable Inflation Model and its Power Spectrum

We present a new exactly solvable inflation model in which inflation can stop automatically,and in the approximately de sitter limit,we give its power spectrum which can be tested in the future observations of cosmic microwave background anisotropy.     

多层对称薄膜的光子晶体光波导设计

基于多层对称薄膜的反射镜作用,设计了一种工作波长位于1550nm附近的基于周期性多层膜的光子晶体光波导。由平板波导的相关理论分析了波长在1515~1587nm范围内电磁波在波导中的传输性质。研究表明TE模和TM模在波导都是基模传输,其功率约束因子(Γ)限制在0.99~1之间,说明波导近乎完全将光波限制在其中传输。在控光能力上这种结构要比普通的三层薄膜波导更具优势。利用周期性多层膜的光子带隙结构,可以构造具有超低损耗的全向带隙介质光波导。     

Tachyon Vortex

The properties and gravitational fields of global strings of tachyon matter are investigated in four-dimensional approximately cylindrically symmetric spacetime with a deficit angle. In particular, we give an exact solution of the tachyon field in the fiat spacetime background and we also find the solution of the metric in the linearized approximation of gravity.     

广义Schwarzschild几何的引力微扰

利用Regge和Wheeler提出的方法,导出了广义Schwarzschild几何的轴扰动方程.对给定角动量L和λ参数,通过数值计算,得到了拟正则模的值.数值结果与不稳定性的解析证明相一致. 关键词：     

Cosmic Microwave Background Radiation Constraints on a Modified Chaplygin Gas Model

A modified Chaplygin gas model of unifying dark energy and dark matter with the exotic equation of state p=Bρ-A/ρα, which can also explain the recent expansion of the universe, is investigated by means of constraining the location of the peak of the cosmic microwave background radiation spectrum. We find that the result of CMBR measurements does not exclude the nonzero value of parameter B, but allows it in the range -0.35 ＜～ B＜～ 0.025.     

荷电D星

研究一类带有立体欠缺角的荷电孤子星(荷电Bose D星),给出了外部度规的近似解和星体质量的近似表达式.同时，对其稳定性进行了讨论，给出了荷的上限，当粒子数小于这个上限时，荷电D星是量子稳定的.     

混合反胶束的电导与微结构研究

反胶束是两亲分子在非极性溶剂中形成的一种有序组合体，在医药、化工、采油、胶束催化及酶催化等领域中有重要应用．与胶束溶液相比，人们对反胶束的形成与结构的了解至今仍不充分．特别是对于由混合表面活性剂形成的反胶束的研究几乎无人涉及．本文采用动态光散射、电导及荧光光谱等手段对阴离子表面活性剂AOT与非离子表面活性剂形成的混合反胶束进行了研究，旨在探讨利用表面活性剂的复配来调节和控制反胶束的结构和性能．亚实验部分二异辛基磺化琉璃酸钠（AOT，Sigma公司）；Brij30为含4个氧乙烯基（EO基）的十二碳醇（AcrosOrgani…     

Charged D stars

We describe charged soliton stars with a solid angular deficit (charged boson D stars), and find the approximate solution in the external space. Besides, we discuss the stability of charged D stars and find when the number of bosons is less than certain value, charged D stars are quantum mechanically stable.