连续初值条件下热传导方程古典解的存在性证明

考虑齐次热传导方程的初边值问题,利用周期热核的性质,给出了在连续初值条件下热传导方程的古典解的存在性证明.     

多属性决策中一种模糊度量排序方法

针对多属性决策的排序问题,在模糊集的基础上重新建立了一种优势关系,定义了新的优势类,利用优势度及综合优势度,基于优势度的多属性决策方法,得到一种多属性决策排序的新方法.给出了此优势关系性质及此方法的可行性.具体实例的应用和验证表明该方法在多种条件下,对多属性排序具有适应性和方便应用的特点,丰富了多属性决策中的排序方法.     

两相介质中火焰诱导激波现象的研究

基于双流体模型，采用跟踪法处理火焰内边界，ＴＶＤ格式计算气相激波，ＭａｃＣｏ－ｍａｃｋ格式计算颗粒相流场，对两相可燃介质中火焰诱导激波现象进行了理论分析与实验模拟，研究了颗粒相参数对火焰诱导激波现象的影响。     

随机级数的收敛性

运用Ｈｏｅｌｄｅｒ不等式,Ｍｉｎｋｏｗｓｋｉ不等式和其它不等式,研究了随机级数的敛散性,给出了随机级数敛散的两个一般性定理,推广了Ｊ－Ｐ．Ｋａｈａｎｅ的相应结果。     

Effect of low-valent atom substitution on electronic structure and magnetic properties of Fe1.5M0.5CoSi (M=V, Cr, Mn, Fe) Heusler alloys

Quaternary Heusler alloys Fe_1.5M_0.5CoSi with M=V, Cr, Mn and Fe have been investigated theoretically and experimentally. All of these samples crystallize in the ordered Heusler-type structure. The calculated electronic structure shows a pseudogap around E_F in the minority spin states of Fe₂CoSi. With the substitution of low-valent atoms for Fe, the majority antibonding peak is shifted to higher energy and a minority gap around the Fermi level is opened. High spin polarization ratio is obtained in Fe_1.5M_0.5CoSi (M=V, Cr, Mn) alloys. The calculated total spin moments decrease with decreasing number of valence electrons and follow the Slater-Pauling curve, which agree with the experimental results well. The Curie temperature decreases as M atom varies from Fe to V, but is always higher than 650 K, which is suitable for technical applications.     

基于Truetime的GSM-R场强测试系统网络性能研究

采用交换式以太网技术设计GSM-R场强测试系统,以完成测试列车运行时速大于250公里时铁路沿线GSM-R场强分布情况,包括场强数据的采集、实时曲线显示、数据回放显示及后期分析;介绍了Truetime仿真工具箱的使用,包括Truetime内核模块、网络模块、ttSendMsg模块、ttGetMsg模块等,对GSM-R场强测试网络设计了一个模型来模拟GSM-R场强数据的传输,使用Tru-etime工具箱模拟分析了网络类型、数据传输速率、交换机缓存容量和网络丢包率对数据传输的影响,结果表明使用交换式以太网技术设计系统可以满足高速列车GSM-R场强测试的要求。     

A hierarchical structure with improved OMP sparse representation used with face recognition

With the rapid development of the face recognition technology, more and more optical products are applied in people's real life. The recognition accuracy can be improved by increasing the number of training samples, but the colossal training samples will result in the increase of computational complexity. In recent years, sparse representation method becomes a research hot spot on face recognition. In this paper we propose an energy constrain orthogonal matching pursuit (ECOMP) algorithm for sparse representation to select the few training samples and a hierarchical structure for face recognition. We filter the training samples with ECOMP algorithm and then we compute the weights by all selected training samples. At last we find the closest recovery sample to the test sample. Simultaneously the experimental results in AR, ORL and FERET database also show that our proposed method has better recognition performance than the LRC and SRC_OMP method.     

流化床焚烧炉中颗粒扩散特性理论研究

本文建立了流化床焚烧炉中粒子扩散方程,通过求解方程,得到了鼓泡床和内旋流床中颗粒扩散特性,并与试验结果进行了对比,两者符合较好。结果表明鼓泡床横向扩散能力较差,而内旋流床有很好的横向扩散特性,非常有利于废弃物在床内的快速扩散。     

分布式光纤温度传感器APD最佳倍增因子的分析

本文分析了分布式光纤温度传感器中光电接收用雪崩光电二极管倍增因子对接收信号的信噪比的影响，给出依据使传感系统光电接收电路输出信号信噪比最大这一最佳意义下ＡＰＤ雪崩因子的表达式，并对此结果进行了分析。     

自适应模糊控制器在光学透镜抛光中的应用

根据抛光机压力、摆幅和摆角对光学透镜磨抛加工质量的影响程度不同，应用模糊逻辑系统表格查询学习算法，构建了一种二维自适应模糊控制器，为抛光工艺的深入探讨奠定了基础。