汽车尾气净化用钯催化剂的制备及活性考察

制备了一系列用于净化汽车尾气的新型钯催化剂．该催化剂以堇青石蜂窝陶瓷为基体与含助剂的γ-Al2O3涂覆层构成载体，La、Ce、Pr、Sm、Nd、Eu、Mg、Ca、Ba、Sr、Ni、Fe、Mn等的复合氧化物为助催化剂，主活性组分钯，含量为0．05％．在实验室配气条件下，对该系列催化剂进行三效活性的测试，结果显示催化剂对CO．THC．NO的T50分别为188℃，213℃，204℃，经空气中1000℃／4h的快速热老化后(相当于汽车运行5万公里)，T50分别为202℃，231℃，222℃；表明，部分助剂引入涂层，增大了载体的比表面积，提高了载体的抗热冲击能力；以氧化物形式引入的另一部分助剂同时起到分散和稳定贵金属的作用，且钯与其产生协同作用，对改善钯催化剂的三效性能有显著效果．     

Manipulation of Quantum Nonlocality of the Single-Photon Entangled State via Beam Splitter

Quantum nonlocality of the single-photon entangled state emerging from a beam splitter with arbitrary controlling parameters is investigated by means of the parity measurement. The condition of the maximal violation of the Bell-CHSH inequality is obtained for the single-photon entangled state. Under the condition of the small coherent intensity J(J=0.1) and the phase difference γαβ of the two coherent displacements being opposite to the internal phase shift φ of the beam splitter (γαβ=-φ), we find that the quantum nonlocality depends only on the reflection coefficient R of the beam splitter, while φ plays an important role for selecting γαβ. The strongest quantum nonlocality can be observed for a 50:50 beam splitter. If R deviates from the intermediate value 0.5, the quantum nonlocality decreases gradually, even vanishes. Our results provide a method to observe and manipulate the quantum nonlocality of the single-photon entangled state by adjusting the parameters of the coherent displacements and the beam splitter.     

L-L型模糊数互补判断矩阵排序方法研究

给出L-L型模糊数互补判断矩阵的概念及一般模糊数相互比较的可能度公式。基于可能度公式。提出了L-L型模糊数互补判断矩阵排序方法。最后，通过算例说明了该方法的可行性和有效性。     

TWO PROBLEMS ABOUT COMPOSITION OPERATORS ON HARDY SPACE

In this paper, two problems about composition operator on Hardy space are considered. Firstly, a new estimation of the norm of a class of composition operators is given. Secondly, the cyclic behavior of the adjoint operator of a composition operator is discussed.     

Fe掺杂YbMnO3晶体的磁性增强研究

通过固相反应和熔融法制备了不同掺杂浓度的Fe掺杂锰酸镱(YbMnO3)晶体,并研究了晶体的铁磁性和反铁磁性性质.不同浓度掺杂YbMn1-xFexO3的晶格参数的变化及XRD物相分析显示,Fe离子进入了YbMnO3晶体的晶胞.磁学性质的测量表明,YbMn0.45Fe0.55O3晶体中存在明显提高的铁磁性质;与YbMnO3晶体相比,YbMn0.45Fe0.55O3晶体的尼尔温度由81 K大幅提高到116 K,同时晶体的反铁磁强度提高了两个数量级.YbMn1-xFexO3晶体具有比YbMnO3晶体更加优异的磁学性质.     

掺氮铌酸锂薄膜的制备及基本物性研究

采用激光脉冲沉积与射频等离子体相结合的方法(PLD-RF),在蓝宝石衬底上一步沉积了掺氮铌酸锂(LiNbO3:N)薄膜.采用X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)和紫外-可见-红外光谱仪(UV-Vis-NIR)对LiNbO3:N的晶格结构、掺杂含量及价态、光学性质进行了研究.结果表明铌酸锂薄膜沿(006)方向择优生长,其中氮的原子含量为2.04;,替代氧原子的位置,N的掺入有效的窄化了LiNbO3的带隙,使其紫外-可见吸收光谱的吸收边出现红移,并且在铌酸锂禁带中引入了杂质能级(Ev),能级深度为2.7 eV.     

扰动模糊命题逻辑的代数结构及其广义重言式性质

着眼于扰动模糊命题逻辑的代数结构,为研究二维扰动模糊命题逻辑最大子代数I2R及其广义重言式提供了一些代数理论基础,最后研究了子代数间广义重言式的关系.     

掺钼铌酸锂晶体的光折变性能研究

生长了掺入不同浓度六价钼元素的铌酸锂晶体(LN∶Mo),并研究了它们在351 nm、488 nm、532 nm和671 nm处的光折变性能.实验结果表明0.5mol;为最佳掺杂量,此时LN∶Mo在各波段具有最快的响应速度和较好的饱和衍射效率.增加极化电流可以提高光折变性能,尤其当极化电流为145 mA时,掺杂量为0.5mol;的LN∶Mo晶体紫外光折变响应时间缩短至0.35 s.这些优异的全息存储性能归因于Mo6+占据了正常的Nb位.LN∶Mo晶体是实现全色全息存储的潜力材料.     

Peeling behavior and spalling resistance of CFRP sheets bonded to bent concrete surfaces

In this paper, the peeling behavior and the spalling resistance effect of carbon fiber reinforced polymer （CFRP） sheets externally bonded to bent concrete surfaces are firstly investigated experimentally. Twenty one curved specimens and seven plane specimens are studied in the paper, in which curved specimens with bonded CFRP sheets can simulate the concrete spalling in tunnel, culvert, arch bridge etc., whereas plane specimens with bonded CFRP sheets can simulate the concrete spalling in beam bridge, slab bridge and pedestrian bridge. Three kinds of curved specimens with different radii of curvature are chosen by referring to practical tunnel structures, and plane specimens are used for comparison with curved ones. A peeling load is applied on the FRP sheet by loading a circular steel tube placed into the central notch of beam to debond CFRP sheets from the bent concrete surface, meanwhile full-range load-deflection curves are recorded by a MTS 831.10 Elastomer Test System. Based on the experimental results, a theoretical analysis is also conducted for the specimens. Both theoretical and experimental results show that only two material parameters, the interfacial fracture energy of CFRP-concrete interface and the tensile stiffness of CFRP sheets, are needed for describing the interfacial spalling behavior. It is found that the radius of curvature has remarkable influence on peeling load-deflection curves. The test methods and test results given in the paper are helpful and available for reference to the designer of tunnel strengthening.