移动传输网络的健壮性分析

从移动传输网络的配套电源、线缆、组网架构、设备构成等多个角度进行描述和分析,旨在提高移动传输网络的健壮性,为增强移动传输网的安全提供保障。     

红外系统中渐晕效应的模拟方法研究

渐晕是红外光学系统中普遍存在的现象,导致最后产生的红外图像存在不应有的亮暗失真情况。对渐晕产生的原因进行了分析,实际系统中不仅有几何渐晕还有透镜造成的渐晕,这两者共同影响图像质量。根据渐晕产生的原因,基于图像像素处理法和光线追迹法建立渐晕效应的数学模型,得到仿真图像并对仿真结果进行分析。理论和实验结果表明文中建立的模型更加完善,有利于红外传感器总体系统的仿真。     

Tensor density matrix theory for determining population and alignment of symmetric top molecule using rotationally unresolved fluorescence

General expressions used for transforming raw laser-induced fluorescence (LIF) intensity into the population and alignment parameters of a symmetric top molecule are derived by employing the density matrix approach. The molecular population and alignment are described by molecular state multipoles. The results are presented for a general excitation-detection geometry and then applied to some special geometries. In general cases, the LIF intensity is a complex function of the initial molecular state multipoles, the dynamic factors and the excitation-detection geometrical factors. It contains a population and 14 alignment multipoles. How to extract all initial state multipoles from the rotationally unresolved emission LIF intensity is discussed in detail.     

内积在溶液浓度测定中的应用

提出内积的溶液浓度测定方法。该方法计算已知浓度溶液透光率曲线与0号溶液（浓度最低的溶液）透光率曲线的内积ρ,确定溶液的ρ-C曲线,然后测定未知溶液的透光率曲线,计算其与0号溶液透光率曲线的内积,并利用已建立好的ρ-C曲线进行插值以估计溶液浓度。由于该方法利用了透光率曲线的全部信息,因此对溶液浓度的估计精度较高。对K2Cr2O7溶液浓度的测定实验结果表明,该方法对溶液浓度的估计相对误差小于1.00%。     

一种基于累加支路辅助的上面级跟踪切换方案

为了满足火箭上面级测控下行信息量增大的特殊要求,借鉴等时性插入业务的思想设计了一种新的适应于上面级测控的信息帧格式。在此基础上,提出了这种帧格式下的跟踪方案,设计利用二阶环路滤波器累加支路输出辅助伪码跟踪环与位同步环的切换。根据推导出的比例因子,仿真了其性能。仿真结果表明,这种切换方式可以实现平滑过渡,性能良好。     

Novel spatial solitons in light-induced photonic bandgap structures

The study of wave propagation in periodic systems is at the frontiers of physics, from fluids to condensed matter physics, and from photonic crystals to Bose-Einstein condensates. In optics, a typical example of periodic system is a closely-spaced waveguide array, in which collective behavior of wave propagation exhibits many intriguing phenomena that have no counterpart in homogeneous media. Even in a linear waveguide array, the diffraction property of a light beam changes due to evanescent coupling between nearby waveguide sites, leading to normal and anomalous discrete diffraction. In a nonlinear waveguide array, a balance between diffraction and self-action gives rise to novel localized states such as spatial “discrete solitons” in the semi-infinite (or total-internal-reflection) gap or spatial “gap solitons” in the Bragg reflection gaps. Recently, in a series of experiments, we have “fabricated” closely-spaced waveguide arrays (photonic lattices) by optical induction. Such photonic structures have attracted great interest due to their novel physics, link to photonic crystals, as well as potential applications in optical switching and navigation. In this review article, we present a brief overview on our experimental demonstrations of a number of novel spatial soliton phenomena in light-induced photonic bandgap structures, including self-trapping of fundamental discrete solitons and more sophisticated lattice gap solitons. Much of our work has direct impact on the study of similar discrete phenomena in systems beyond optics, including sound waves, water waves, and matter waves (Bose-Einstein condensates) propagating in periodic potentials.      

小尺寸波纹光阑的实验研究

报道了在光路中使用小尺寸波纹光阑代替圆孔光阑的研究结果。应用菲涅耳衍射光强分布理论以及光上光强分布理论对波纹光阑在一定条件下的作用范围进行了分析。用CCD成像系统对实验结果进行记录。结表明实际与理论能较好地吻合。从光路的实际使用效果看，对比圆孔光阑，应用波纹光阑在其作用范围内实现了对光束衍射调制的抑制和填充冈子的提高。     

Dielectric Properties of Multilayered Ba0.5Sr0.5TiO3 Thin Films Deposited on ITO-Coated Corning 1737 Glass by rf Magnetron Sputtering

A new stacking method via variation ofsubstrate temperature in rfmagnetron sputter is used to fabricate polycrystalline/polycrystalline Ba0.5Sr0.5TiO3 thin films with higher dielectric constant, higher breakdown strength and lower leakage current densities than those prepared by a conventionM deposition method. The improved figure of merit G （ε0εrEb） of the Ba0.5Sr0.5TiO3 thin films implies that they are a feasible insulation layer for thin film electroluminescent devices.     

被动毫米波制导下辐射特性控制的考虑

为提高地面目标在未来战场的生存能力,分析了被动毫米波探测与制导的作用原理与实际威胁,指出了目标的毫米波辐射特性控制的实际需要。在对毫米波辐射特性测量机理的深入分析,与辐射计探测距离公式的推导、讨论基础上,指出毫米波辐射特性控制的主要方向为目标的形状和材料特性的控制,并从这两方面分析了辐射特性控制的实际措施。     

推广的Painlevé展开及KdV方程的非标准截断解

利用奇性流形的任意性，选用不同的展开函数及非标准截断展开于KdV方程，得到了许多用复杂隐函数表示的精确解. 关键词：