Spike-layered Solutions of Singularly Perturbed Quasilinear Dirichlet Problems on Ball

We consider the singularly perturbed quasilinear Dirichlet problems of the form {-∈Δ_pu = f(u) in Ω u ≥ 0 in , u = 0 on ∂ Ω where Δ_pu = div(|Du|^{p-2}Du), p > 1, f is subcritical. ∈ > 0 is a small parameter and is a bounded smooth domain in R^N (N ≥ 2). When Ω = B_1 = {x; |x| < 1} is the unit ball, we show that the least energy solution is radially symmetric, the solution is also unique and has a unique peak point at origin as ∈ → 0.     

硼酸锶钡(Ba0.87Sr3.13B14O25)晶体的生长、结构和性质研究

本文报道了一种新的硼酸盐化合物-Ba0.87Sr3.13B14O25,采用泡生法已生长出尺寸为35mm×25mm×5mm的晶体.该晶体为单斜晶系,C2/m空间群,a=1.6425(3)nr,b=0.77739(16)nm,c=1.6665(3)nm,β=119.22(3)°,Z=4.结构中B3O8六元环通过O原子和BO3三角形相互连接,构成三维的硼氧阴离子骨架,金属阳离子占据多面体间的空隙.测量了BSBO晶体的透过谱,该晶体的显微硬度为578kg/mm2.     

Pseudo Peak Phenomena in Micellar Electrokinetic Capillary Chromatography by Using Ionic Surfactant

The origin of pseudo peak was studied by means of micellar electrokinetic capillary chromatography with cetyltrimethylaminium bormide as the pseudo stationary phase.It has been pointed that two peaks may appear for one component under certain conditions.Experiments showed that the relative areas of the two peaks of analyte depended on the time and the temperature of reaction between analyte and surfactant,and the concentration of surfactant in the sample solution.It means that the interaction between the analyte and the surfactant is a slow process,and a stable substance can be produced from the interaction.It is the substance and the analyte that may lead to the formation of two peaks.The fast interaction mechanism between the solute and the micellar should be queried from the experiment result.     

低空高射武器观瞄系统的图像处理技术

初步探讨和分析了一种用于高射武器系统的自动跟踪、瞄准系统 ,并根据高射武器系统服务目标的特点 ,提出了一种适用于该条件下的目标识别方法 :利用峰值跟踪的特点找出视场中目标上的一点 (当视场中有目标存在时 ) ,以此点为生长点 ,按照一定的生长规则 ,寻找出目标区域 ,并对目标区域进行统计 ,解算出目标的几何中心。实验结果表明 :该算法能够平稳地跟踪图像中的目标 ,而且可以很容易地滤除图像中噪声的影响而不增加额外的时间     

机载激光测距机测距性能的数值仿真

根据激光测距机对漫反射大目标的测距方程,从理论上分析了激光测距机的测距性能与大气透过率及背景噪声之间的关系;并使用LOWTRAN7软件,对它们之间的依赖关系进行了数值计算与深入探讨,为机载激光测距机的测程指标的设计及测试提供了依据。     

基于FPGA的数字核脉冲处理硬件平台设计

为了研究数字化γ能谱仪，采用现场可编程逻辑部件（FPGA），完成数字多道脉冲幅度分析仪的硬件设计。用QuartusⅡ软件在FPGA平台上完成了数字核脉冲的幅度提取并生成能谱。在此基础上通过电路设计建立了数字化能谱测量实验装置，实测了137Cs的能谱，测量结果与相同条件下的模拟能谱仪的实测谱完全吻合。由此证明基于FPGA的数字多道脉冲幅度分析器硬件设计正确可行，具有实用性。     

Noncommutative topology and Jordan operator algebras

Jordan operator algebras are norm‐closed spaces of operators on a Hilbert space with for all . We study noncommutative topology, noncommutative peak sets and peak interpolation, and hereditary subalgebras of Jordan operator algebras. We show that Jordan operator algebras present perhaps the most general setting for a “full” noncommutative topology in the ‐algebraic sense of Akemann, L. G. Brown, Pedersen, etc, and as modified for not necessarily selfadjoint algebras by the authors with Read, Hay and other coauthors. Our breakthrough relies in part on establishing several strong variants of ‐algebraic results of Brown relating to hereditary subalgebras, proximinality, deeper facts about for a left ideal L in a ‐algebra, noncommutative Urysohn lemmas, etc. We also prove several other approximation results in ‐algebras and various subspaces of ‐algebras, related to open and closed projections and technical ‐algebraic results of Brown.     

Companding schemes based on transforming signal statistics into trigonal distributions for PAPR reduction in OFDM systems

This paper proposes four companding transforms to reduce the peak‐to‐average power ratio in orthogonal frequency division multiplexing systems. The four companding transforms are obtained by transforming signal statistics into four trigonal distributions. Computer simulations show that the proposed schemes can effectively improve the PAPR performance and bit error rate performance of OFDM systems. Copyright © 2010 John Wiley & Sons, Ltd.     

SPECTROSCOPIC INVESTIGATIONS AND IDENTIFICATION OF THE OCCURRENCE OF MULTIPHOTON ABSORPTION PROCESSES IN CADMIUM IODIDE

Spectroscopic investigations for cadmium iodide (CdI₂) crystal have been carried out at 80 K under laser excitation. Due to the self-trapped excitons of CdI₂, a broad-band stimulated emission spectrum with its peak emission around 520 nm was achieved from the crystal under two-photon pumping by means of ruby laser. The photoluminescence (PL) studies in the crystal show overall nonlinear dependence of the PL peak intensity on input laser energy. The occurrence of slopes about 2 and 3 obtained in the desired energy range of interest for ruby and neodymium laser excitations, respectively, indicate corresponding photon absorption process. The photon absorption coefficients for the processes were calculated.     

基于水下图像小波变换的图像阈值去噪方法的研究

水下图像污染过程和机理十分复杂,不同的水下环境噪声也不尽相同。在此尝试用小波阈值去噪方法对水下图像进行去噪,力求改善图像质量。小波阈值去噪是信号处理中一种重要的去噪方法,针对常用硬阈值函数不连续的特点以及软阈值函数存在偏差的问题,提出了一种新的阈值处理方法。在Matlab中的仿真试验结果表明,新阈值方法的去噪效果无论在视觉效果上,还是在信噪比上都优于传统的硬阈值和软阈值,充分体现出小波阈值去噪方法的优越性。