多元向量值正交小波包的刻画

In this paper,the notion of orthogonal vector-valued wavelet packets of space L2(Rs,Cn)is introduced.A procedure for constructing the orthogonal vector-valued wavelet packets is presented.Their properties are characterized by virtue of time-frequency analysis method,matrix theory and finite group theory,and three orthogonality formulas are obtained.Finally,new orthonormal bases of space L2(Rs,Cn)are extracted from these wavelet packets.     

Basic ionic liquid as catalysis and reaction medium: a novel and green protocol for the Markovnikov addition of N-heterocycles to vinyl esters, using a task-specific ionic liquid, [bmIm]OH

A basic ionic liquid, 1-methyl-3-butylimidazolium hydroxide ([bmIm]OH), has been introduced as a catalyst and reaction medium for the Markovnikov addition of N-heterocycles to vinyl esters under mild conditions. The evidence for the role of this basic ionic liquid [bmIm]OH in promoting the Markovnikov addition has been given. On the basis of the evidence, a mechanism was postulated.     

氧化钴纳米管的制备和模板剂多孔氧化铝的孔洞结构

以草酸电解液制备的多孔氧化铝作为模板,采用硝酸钴溶液浸润法,合成出氧化钴纳米管．通过对分叉氧化钴纳米管成因研究,指出氧气气泡的作用是形成多孔氧化铝纳米孔洞结构的主要驱动力．     

利用高通量技术研究钴基费托催化剂的宏观动力学

利用高通量技术设计并运行了16路平行动力学固定床反应器,用于测量不同接触时间下的稳态反应物消耗速率和产物生成速率,研究了钴基费托催化剂的宏观动力学,包括C1～C4烷烃与烯烃的稳态反应速率及其随床层的分布,以及它们与反应器温度的关系.在等温固定床非扩散限制的反应条件下,除C1和C2烃类外,Cn的生成速率及CO/H2的消耗速率均随接触时间的增加先上升后下降,且烯烃生成速率的最高点较烷烃更靠近反应器入口;反应温度对速率的影响与转化率有关:生成烷烃的表观活化能大于烯烃.高通量动力学反应器可用于生成宏观动力学数据库,以预测催化剂在工业固定床反应器中的行为.     

磁电CoFe2O4/BaTiO3纳米管的溶胶-凝胶模板法合成和表征

用溶胶-凝胶模板法合成了CoFe2O4/BaTiO3(CFO/BTO)复合纳米管, 管的直径约为100、200和300 nm, 其长度约为100 μm. X射线衍射(XRD)和选区电子衍射(SAED)都显示复合纳米管中同时存在尖晶石相的CoFe2O4 (CFO)和钙钛矿相的BaTiO3(BTO), 进一步的透射电子显微镜(TEM)研究证实合成的纳米复合物具有明显的管状结构. 磁、电研究表明, 该复合纳米管的磁性与纯CFO纳米管的磁性相当; 而铁电性与纯BTO纳米管的铁电性相当.     

Optical and Structural Properties of Cr-Doped GaN Grown by HVPE Method

Single crystalline Cr-doped GaN fihns are successfully grown by hydride vapor phase epitaxy. The structure analysis indicates that the film is uniform without detectable Cr precipitates or clusters and the Cr atoms are substituted for Ga sites. The impurity modes in the range 510 530cm^-1 are observed by the Raman spectra. The modes are assigned to the host lattice defects caused by substitutional Cr. The donor-aeceptor emission is found to locate at Ec - 0.20 eV by analyzing the photoluminescence spectrum obtained at different temperatures, and the emission is attributed to the structural defects caused by CrGa-VN complex. The superconductor quantum interference device results show that the Cr-doped GaN film without detectable Cr precipitates or clusters exhibits paramagnetic properties.     

Optimum condition of efficiency functions for HPGe γ-ray detectors in the 121-1408 keV energy range

The optimum condition of three commonly used functions in the Genie 2000 γ spectra analysis software have been studied in the 121-1408 keV energy range. The three functions are applied for fitting the full-energy peak efficiency of the HPGe gamma-ray detector. A detailed procedure to obtain the optimum condition is described. The HPGe detector is calibrated at 11 cm by three radioactive sources of point form （^152Eu, ^137Cs, ^60Co） providing 11 energy peaks. After data processing, results shows that the three functions used in the Genie 2000 gamma spectra analysis software fit best at orders 3-5. Lastly the standard radioactive source 133Ba is chosen to validate the results. Differences between the standard activity of 133Ba and the result obtained from the fitting functions are below 1.5%. Therefore the optimum orders of the three functions used in the Genie 2000 3, spectra analysis software are 3-5 with the 11 energy peaks.     

Elastic Scattering of 6He + p at 82.3MeV/nucleon

Differential cross sections for the elastic scattering of halo nucleus 6He on proton target were measured at 82.3 MeV/u. The experimental results axe well reproduced by optical model calculations using global potential KD02 with a reduction of the depth of real volume part by a factor of 0.7. A systematic analysis shows that this behavior might be related to the weakly bound property of unstable nuclei.     

气粒两相湍流中颗粒倾向性分布现象的研究

选取平板混合层流动大涡模拟的某一瞬态流场,获得了稳态颗粒倾向性分布现象,并跟随富集区颗粒全轨道,分析了其运动状态沿轨道的变化.发现导致倾向性分布的并轨和轨道分离两种机制.在并轨机制中,不同来源的颗粒被较强涡旋俘获,使向心力和离心力平衡而产生趋同效应,进而发生并轨.在轨道分离机制中,邻近颗粒处于垂向速度方向有较大差异流场中会发生相反偏转,从而产生轨道分离.研究还表明:这些机制只能在跟随性和惯性相对平衡的颗粒中才能发生.     

清华汤姆逊散射X射线源初步实验研究

汤姆逊散射X射线源利用高亮度的相对论电子束与超短TW级激光相互作用,能产生能量可调、脉冲长度短（～100飞秒量级）的准单色高能X射线,在超快物理过程研究和医学领域具有广泛的应用前景。清华大学工程物理系加速器实验室正在积极筹建基于光阴极微波电子枪和飞秒强激光的汤姆逊散射实验平台,并利用实验室现有的16MeV返波行波加速器和Nd:YAG纳秒调Q激光系统进行了初步实验研究。在解决实验中出现的电磁干扰和韧致辐射X射线本底干扰等问题后,在实验中测量到了脉宽为6纳秒、脉冲光子产额为1.7x 10^4 的散射光子信号。在本文中将对实验装置和结果进行详细介绍。