观测向量的变换对广义线性模型参数估计的影响

本文一般地考察了观测向量Ｙ用线性变换ＦＹ代替对广义线性模型Ｙ＝Ｘβ＋ε的系数估计的影响，得到了由变换引起的方差增量公式，并由此得到了一个可估子空间，当且仅当其中元素的估计优良性不因观测向量的变化而改变，这一结果推广了文献［１］的结果．     

A blow‐up criterion for incompressible hydrodynamic flow of liquid crystals in dimension two

In the paper, we establish a Serrin type criterion for strong solutions to a simplified density‐dependent Ericksen‐ Leslie system modeling incompressible, nematic liquid crystal materials in dimension two. Copyright © 2013 John Wiley & Sons, Ltd.     

Investigation of unsupported Pt–Ru catalysts for high temperature methanol electro-oxidation

Two unsupported Pt–Ru catalysts, varying in the nature and content of RuOx species, were investigated for methanol electro-oxidation in a solid polymer electrolyte fuel cell at high temperature. The catalyst containing a lower amount of ruthenium oxide showed higher catalytic activity and lower mass transport limitations. A physicochemical investigation was carried out to support the interpretation of electrochemical results. Pt–Ru alloy appears more active than Pt–RuOx in the chemisorption of labile-bonded oxygenated species, which promote the oxidation of the methanolic residues adsorbed on the catalyst surface.     

关于序半群的模糊拟理想

In this paper,fuzzy quasi-ideals of ordered semigroups are characterized by the properties of their level subsets.Furthermore,we introduce the notion of completely semiprime fuzzy quasi-ideals of ordered semigroups and characterize strongly regular ordered semigroups in terms of completely semiprime fuzzy quasi-ideals.Finally,we investigate the characterizations and decompositions of left and right simple ordered semigroups by means of fuzzy quasi-ideals.     

New exact solutions to breaking soliton equations and Whitham-Broer-Kaup equations

In this paper, by using the improved Riccati equations method, we obtain several types of exact traveling wave solutions of breaking soliton equations and Whitham-Broer-Kaup equations. These explicit exact solutions contain solitary wave solutions, periodic wave solutions and the combined formal solitary wave solutions. The method employed here can also be applied to solve more nonlinear evolution equations.     

Mono- and dinuclear palladium(II) complexes incorporating 1,2,3-triazole-derived mesoionic carbenes: syntheses,solid-state structures and catalytic applications

Transition Metal Chemistry - Two 1,2,3-triazole-derived monocationic salts 3 and 4 bearing N-aryl wingtips were prepared using copper-catalyzed “click” reactions followed by alkylations...     

ICP-AES测定意大利底漆中的铬、铁、铅和锌含量

为了充分利用ICP-AES仪器方便快捷地分析进口的意大利底漆中微量的铬、铁、铅和锌含量,采用炭化、煅烧、硝酸酸洗的方法对样品进行预处理,并确定了试验的最佳测试条件。结果表明,方法的检出限为0.0035—0.0048mg/L,回收率为96.7%—103.0%,RSD小于2%。该方法准确、快速、简便,本方法实现了利用硝酸介质的单元素标准溶液来测试有机溶剂中的金属离子含量,为ICP-AES在有机材料上的应用提供了一种方法借鉴。     

Spectral characterization of novel LiZnVO4 phosphor

This paper reports on the spectral analysis of novel Lithium Zinc Vanadate (LiZnVO₄) phosphor prepared by a solid state reaction method. Emission spectrum of LiZnVO₄ has shown a bright green emission at 533 nm with λ_exci = 359 nm. A bright green color emission has also been noticed directly from this phosphor under an UV source. For this luminescent phosphor, X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDS), Fourier-transform IR spectroscopy (FTIR), Raman Spectrum, Comprehensive Differential Thermo gravimetric Analysis (TG–DTA) have also been carried out.     

混合价态Eu(+2,+3)离子激活的单一组分发光材料:设计合成、发光性质及机理

作为绿色照明光源的典型代表,白光发光二极管(LED)被誉为21世纪的新一代照明光源。而作为白光LED重要组成部分的荧光粉,对其性能要求也不断被提升。Eu~(2+)和Eu~(3+)由于其电子结构上的差别导致其截然不同的发光性质。其中,Eu~(2+)的特征发射为4f–4f跃迁,而Eu~(3+)离子的特征发射为4f–5d跃迁。为了结合两者各自的发光特性,近年来对于混合价态Eu离子的研究成为热点。混合价态Eu离子掺杂荧光粉结合了Eu~(2+)和Eu3+离子各自的发光特点,具有颜色灵活可调的优良性质。本文主要从Eu~(2+)、Eu~(3+)各自性质出发,从不等价取代、晶场调控等三个方面综述了混合价态Eu(+2,+3)离子激活的单一基质发光材料近年来的研究进展。此外,对不同方法制备的混合价态Eu离子掺杂荧光粉的发光性能及发光机理也进行了归纳总结,为无机荧光材料的发展提供了新的思路。     

关于随机紧凸集的更新定理

该文在讨论了多维更新定理的基础上,重点研究了随机紧凸集的Minkowski和的更新定理,得到了一系列重要结论.