稀土铕高分子荧光配合物的制备及性能研究

稀土配合物作为发光材料已广泛应用于众多领域,为了使材料获得更稳定更持久的发光性能,本文以N-乙烯基甲酰胺(NVF)和丙烯酰胺(AM)为共聚单体,水为溶剂,在高温、引发剂条件下经自由基溶液聚合制备出含有氨基、羧基等多种配位官能团的水溶性高分子聚合物两性聚乙烯胺(PVAm),并以此作为高分子配体,再辅以1,10-邻菲咯啉(phen)作为第二配体,用三价稀土离子铕(Eu)的盐溶液与之配位,制备出具有优良荧光效应的稀土配合物Eu(PVAm)_3phen荧光粉。对高分子配体PVAm进行IR、NMR等分析,找出配位官能团,并对稀土配合物的外观形貌进行荧光显微镜等观察分析,对配合物的结构进行XRD等表征,并分析其紫外光谱、荧光光谱、荧光余辉亮度。配合物在220～275 nm范围内对紫外光有较强的吸收,最大吸收峰在260 nm处。配合物在580、593、614、650 nm的4处有明显的荧光发射峰。     

双重分离全自动控制空气分离器工作过程分析

讨论分析双重分离全自动控制空气分离器的工作过程及影响因素。     

Cu-Containing Fe-Ni Corrosion-Resistant Alloys Designed by a Cluster-Based Stable Solid Solution Model

Copper is a good corrosion resisting element, but due to its immiscibility with Fe, it is only used as a minor-alloying element in stainless steels. In this work, we introduced a double-cluster structure model [CuNi₁₂][NiFe₁₂] _m for stable solid solutions in Cu-containing Fe-Ni corrosion-resistant invar alloys. Our model takes into account all of the enthalpies between the element pairs by assuming Fe-Ni and Ni-Cu nearest neighbors and by avoiding Fe-Cu ones, so that the ideally stabilized structures are described by mixing two cuboctahedral clusters in the fcc lattice, NiFe₁₂ and CuNi₁₂. Two alloy series were designed by varying the relative proportions of the two clusters and the Cu contents. It was proved that the alloys with Cu contents below those prescribed by this model could easily be solutionized and water-quenched to a monolithic fcc solid solution, and resultant alloys possessed good corrosion-resisting properties in 3.5 wt pct NaCl solution.     

超高速开关磁阻电动机设计

开关磁阻电机结构简单坚固,转子上无永磁体和绕组,特别适合超高速运行。针对超高速电机的运行特点,对超高速开关磁阻电机的多物理场一体化设计方法进行探讨,研制了一台6/2结构超高速开关磁阻样机,样机最高转速为130 000 r/min,功率为1 kW。为提高样机的起动转矩,改进了样机的转子结构,并基于有限元法对样机的电磁性能和动力学性能进行优化。采用自主开发的具有角度控制功能的开关磁阻电机专用集成电路SR3P10K07A作为控制系统的控制核心。最后对样机进行了实验,实验结果表明本文采用的设计方法、转子结构和专用芯片是可行和有效的。     

Object-oriented development and application of a nonlinear structural analysis framework

This paper describes the framework and application of numerical simulation software on earthquake engineering research and practice. The analysis kernel is developed at the National Center for Research on Earthquake Engineering (NCREE) and is entitled as “Platform of Inelastic Structural Analysis for 3D systems (PISA3D)”. The design of PISA3D framework adopts the Design Pattern and the Unified Process. PISA3D provides structural modeling and high computational efficiency for engineers and researchers to simulate the responses of nonlinear systems under various kinds of load effects. It includes static or cyclic loads, displacements, earthquake ground accelerations, and earthquake aftershocks. PISA3D is easy to extend and maintain due to its object-oriented nature. Advanced users can derive or compose its objects’ libraries to perform different types of structural analyses. Based on object-oriented techniques, VISA3D (Visualization of Inelastic Structural Analysis for 3D systems) has been implemented with usage of OpenGL for 3D graphics and MFC for graphical user interface (GUI). Its framework allows further extension on new input formats and new element types. VISA3D has been mainly developed as a post-processor to examine the analytical results of PISA3D through 2D/3D static or dynamic graphic approaches. It includes graphical checking of the structural model, mode shapes, deformations, extents and locations of plastic hinges, plotting of nodal velocity, acceleration, and energy distribution time histories. This paper then introduces NCREE’s recent development on the pre-processing framework GISA3D (Graphical Interface of Inelastic Structural Analysis for 3D systems). The GISA3D does not only supply features as a “post-processor”, but also fully supports operations of “model generation” via mouse motion. Users can create, remove, modify and set elements/nodes through mouse clicking, dragging and selecting. Finally, this paper illustrates the networked sub-structural pseudo dynamic tests using PISA3D as the analysis engine, and concludes with several successful applications of PISA3D/VISA3D/GISA3D on various researches and actual structural engineering projects.     

Service‐based high‐speed railway base station arrangement

To provide stable and high data rate wireless access for passengers in the train, it is necessary to properly deploy base stations along the railway. We consider this issue from the perspective of service, which is defined as the integral of the time‐varying instantaneous channel capacity. With large‐scale fading assumption, it will be shown that the total service of each base station is inversely proportional to the velocity of the train. Besides, we find that if the ratio of the service provided by a base station in its service region to its total service is given, the base station interval (i.e., the distance between two adjacent base stations) is a constant regardless of the velocity of the train. On the other hand, if a certain amount of service is required, the interval will increase with the velocity of the train. The aforementioned results apply not only to simple curve rails, like line rail and arc rail, but also to any irregular curve rail, provided that the train is traveling at a constant velocity. Furthermore, the new developed results are applied to analyze the on–off transmission strategy of base stations. Copyright © 2013 John Wiley & Sons, Ltd.     

混合溶剂芳脂比与特定温度下密度的关系

为提高生产效率、降低生产成本、快速判断混合溶剂芳脂比,研究了混合溶剂芳脂比与特定温度下密度的关系。实验结果表明,混合溶剂的芳脂比与其特定温度下的密度之间存在明显线性关系,且该线性关系对生产具有指导意义。