Mach-Zehnder波导中TM波的FD-BPM分析

M-Z结构波导是许多集成光学器件中的重要组成单元。本文结合辐射透明边界条件(TBC)，由Maxwell方程导出了TM模有限差分光束传播法(FD-BPM)基本方程．用FD—BPM法系统地模拟了M-Z波导结构中TM模的传播情况，并着重对其结构进行了优化设计．取得了二维情况下的最佳尺寸。研究结果表明，该法在模拟分析集成光学中具有的有效性、方便性和优越性，为实际的设计制作提供了很好的模拟依据。     

不同遥感信息在准格尔丘陵地区土地利用现状调查中的应用

准格尔丘陵地区是内蒙古自治区境内地形切割最为破碎的地区，又是“三北”防护林工程在鄂尔多斯高原重点造林治理地区，查清该地区的土地利用现状，是今后合理利用土原基础。本文通过对不同遥感信息源在该地区土地利用现状判读中的应用比较研究，认为要想对该地区土地利用现状进行准确的调查研究，大比例尺的彩红外航片的应用是非常需要的。     

双片TM1300视频采集卡的高速数据传递方案

介绍了一种基于双片TM1300的双路视频采集卡的高速数据传递方案。在分析了TM1300芯片的EVO、VI、PCI、SSI等外设接口特性的基础上,提出了用EVO与VI互联来实现双路视频采集卡中双片TM1300间高速数据传递的设计方案。其特点是实现简单,数据传送效率高,并采用CPLD芯片设计了EVO与VI的逻辑接口,通过MAX+PLUSII时序仿真验证了CPLD设计的正确性。     

MPEG-2多节目的系统复用分析

本文主要研究了MPEG - 2多节目系统复用的问题。对多路节目的复用 ,在图像通信领域 ,可采用两种编码方式 :独立编码和联合编码。在独立编码中介绍了帧平移算法和基于宏块条的互相关算法 ;对于联合编码 ,本文介绍了一种利用超帧概念的基于率失真理论的联合码率控制策略 ,同时阐述TM 5码率控制原理。最后得出结论 ,独立编码中重建图像存在显著差异 ,联合码率控制可以改善此缺陷 ,可节省频带资源 ,但仍需要进一步研究。     

The microwave heating of three-dimensional blocks: semi-analytical solutions

The microwave heating of three-dimensional blocks, by the transversemagnetic waveguide mode TM₁₁, is considered in a long rectangularwaveguide. The governing equations are the forced heat equationand a steady-state version of Maxwell's equations, while theboundary conditions take into account both convective and radiativeheat loss. Semi-analytical solutions, valid for small thermalabsorptivity, are found using the Galerkin method. The electricalconductivity and the thermal absorptivity are assumed to betemperature dependent, while both the electrical permittivityand magnetic permeability are taken to be constant. Both a quadraticrelation and an Arrhenius-type law are used for the temperaturedependency. As the Arrhenius-type law is not amenable analytically,it is approximated by a rational–cubic function. A multivaluedsteady-state temperature versus power relationship is foundto be possible for both types of temperature dependency. Atthe critical power level thermal runaway occurs when the temperaturejumps from the lower (cool) temperature branch to the upper(hot) temperature branch of the solution. The semi-analyticalsolutions are compared with numerical solutions of the governingequations for various special cases such as the limits of smalland large heat loss at the edges of the block. An excellentcomparison is obtained between the semi-analytical and numericalsolutions, on both temperature branches for the Arrhenius-typelaw. For the quadratic temperature dependency the comparisonis excellent on the low branch but the semi-analytical theorysignificantly underpredicts the temperature on the upper solutionbranch.     

基于遥感技术的滇池水域面积变化监测研究

利用遥感技术,以1992年TM,2000年ETM+,2006年ETM+,2011年ETM+,2012年ETM+,2013年ETM+6年的遥感影像为数据源,探讨昆明市滇池从1992年到2013年水域面积的变化.对6幅影像进行缨帽变化并通过波段比值法增强后设置相应的阀值提取水体边界,通过envi软件计算其面积,取得了很好的效果.     

IR spectroscopy investigation of molecular association in the acetone-trichlormethane mixture

A significant increase in the stretching band intensity of trichloromethane in IR spectra of its solutions in acetone with increasing acetone mole fraction indicates the formation of hydrogen bonds between their molecules. The integral absorption coefficient (α) of this vibration is calculated. Experimental values of α are approximated by a theoretical dependence using the nonlinear least-squares method; association parameters are obtained. The relative volume fractions of H-bonded and free trichloromethane molecules are calculated depending on the total trichloromethane volume fraction in solution. The structure of the H-bonded associate is determined by quantum chemical calculations.     

基于RS和GIS林分蓄积预估模型的评价指标因子选择

以RS和GIS为技术手段,提取样地的地形因子和遥感图像处理后的TM全波段光谱值及植被指数,采用模糊聚类方法对罗汉山森林公园林分生长蓄积量预估模型的主要评价指标因子进行了选择,为林分蓄积预估模型的建立做了准备.     

Solutions of the reflection equation for the vertex model

We investigate the possible regular solutions of the boundary Yang–Baxter equation for the fundamental U_q[G₂] vertex model. We find four distinct classes of reflection matrices such that half of them are diagonal while the other half are non-diagonal. The latter are parameterized by two continuous parameters but only one solution has all entries non-null. The non-diagonal solutions do not reduce to diagonal ones at any special limit of the free-parameters.     

基于网络传输的实时图像融合系统设计

 为了实现图像融合系统远距离实时传输,提出一种基于TI公司TMS320DM642和TMS320DM365处理器平台的高速网络传输图像融合系统的设计方案。设计基于TMS320DM642融合模块和基于TMS320DM365网络传输模块,解决了图像融合模块和网络传输模块间的数据通信问题;在融合模块中实现图像配准和图像实时融合,融合图像数据在网络传输模块中进行H-264算法压缩并根据RTP(real-time transport protocol,实时传输协议)协议实现RTP封包处理,传输码率约为460 kb/s;利用线程间管道通信技术,实现了一种新的基于RTP/RTSP(real time streaming protocol,实时流传输协议)嵌入式流媒体服务器的搭建方法。实验结果表明：系统总体图像延迟为300 ms左右。