Study of Pseudo Spin Valves Based on $L1_{0}$ (111)-Oriented FePt and FePtCu Fixed Layer With Tilted Magnetocrystalline Anisotropy

In this paper, we demonstrate a series of pseudo-spin-valve structures based on L1₀ (111)-oriented FePt and FePtCu with titled magnetocrystalline anisotropy. Highly ordered (111)-oriented L1₀ FePtCu with large anisotropy is achieved by optimizing the Cu content. Magnetoresistance (MR) up to 5% has been obtained by 1) optimizing the FePtCu growth using different underlayers, 2) enhancing the interface spin polarization using thin CoFe at the Cu interfaces, and 3) adjusting the Cu spacer thickness. The substantial MR realized with tilted fixed layer magnetization is an important prerequisite for the realization of tilted polarizer spin torque oscillators (STOs) or spin-transfer torque magnetoresistive random access memories (STT-MRAMs).     

Microcellular foaming of plasticized thin PC sheet I. Effects of processing conditions

Novel microcellular foams using thin plasticized PC sheet were prepared by compression molding. The measurement results showed that T _g of plasticized PC was decreased and the molecular chain mobility was increased. Decrease in T _g and increase in chains mobility were contributed to the widen of foaming temperature window. Effects of processing conditions on cell size, cell density and relative density were also investigated. The experimental results show that the temperature, tributyl citrate and foaming agent content have more effects on the structures and morphology of the plasticized PC microcellular foam. Effects of experimental conditions on cell size distribution have also been discussed.     

现代方言词语也有声近义通现象

描写四川方言常用词"刨"的音义,表示用手或工具拨拉着向自己怀抱方向拉扯、聚拢或者保护之义。和普通话、其他方言的一些词相比较,并上溯其源,认为现代方言中也有声近义通现象。     

带有法兰接触面的空心圆锥接口重要标准分析对比

研究国家标准、国际标准和德国标准,分析国际标准带有法兰接触面的空心圆锥接口的型式和尺寸,剖析A型、C型、T型带有法兰接触面的空心圆锥接口的区别;对比国际标准和德国标准,指出标准在企业生产中的作用。     

卤化银感光片的单浴显影

介绍了一种单浴显影的实验方法，它不同于目前广泛采用的将显影、定影分两步走的传统的处理方法，而是将显影剂和定影剂集于一液，使感光片经一种药液处理即获得原显影和定影的功效。     

高碾压混凝土坝施工过程仿真研究

本文根据碾压混凝土坝施工特点，采用计算机系统仿真技术和排队随机仿真网络理论，建立了高碾压混凝土坝施工交通运输系统排队网络仿真模型和高碾压坝施工浇筑过程仿真模型。应用该模型可以较好地研究高碾压混凝土坝施工过程中混凝土的运输和大坝浇筑过程问题，通过算例分析，可以看出：采用这种模型进行计算机仿真，所得结果可为高碾压混凝土坝施工组织设计提供一定参考。     

Study on the communication method for chaotic encryption in remote monitoring systems

In chaotic cryptosystems, it is recognized that using (very) high dimensional chaotic attractors for encrypting a given message may improve the privacy of chaotic encoding. In this paper, we study a kind of hyperchaotic systems by using some classical methods. The results show that besides the high dimension, the sub-Nyquist sampling interval (SI) is also an important factor that can improve the security of the chaotic cryptosystems. We use the method of time series analysis to verify the results.     

求解TSP问题的思维进化算法

针对一类非数值问题──TSP的特点,在基本思维进化算法(MEC)框架的基础上,提出了求解TSP的趋同和异化策略,从而实现了MEC在求解非数值问题的一个应用,并对其收敛性进行了简要证明。同某些遗传算法(IENS和GESA)比较的仿真实验结果表明:MEC在收敛速度、解的优良性等方面要优于这些遗传算法。     

A PDES/STEP-based model and system for concurrent integrated design and assembly planning

Product data exchange and interfacing between different CAD/CAM systems are of great importance to the development of concurrent integrated design environments and computer integrated manufacturing systems. This paper presents a STEP-based method and system for concurrent integrated design and assembly planning. An integrated object model for mechanical systems and assemblies is first defined by a hierarchy of structure, geometry and feature. The structure is represented as a component-connector or joint multi-level graph with both hierarchical functional and assembly relations. These hierarchical relation models are then used for uniformly describing their causal relations both for assembly level and feature based single part level. The generic product assembly model is organized according to STEP, using mostly the entities of integrated resources and partly self-defined entities, which are necessary for design and assembly planning. Based on the generic product assembly model, STEP-based strategies and agent concepts are used for agent-based concurrent integration of design and assembly planning. A prototype system, consisting of a CAD system, a product modeling system, an assembly planning system, and an assembly evaluation system is developed, in which product data can be exchanged between these subsystems. Details about the implementation of the system are addressed. The integrated design and assembly planning system can support the introduction of a new product. The results of assembly planning are feedback to the stage of assembly design to improve on the design. A case study is carried out for assembly-oriented design of a gearbox, to illustrate the proposed approach and to validate the developed system.     

面向需求面向服务(上)——深圳广播电影电视集团网络化建设实践

本文从深圳广播电影电视集团网络化建设实践出发,针对电视台全台网系统的建设、维护两大阶段的相关问题,提出了面向需求的网络系统架构模式和面向服务的网络系统运维管理模式,对广电媒体行业的网络系统架构和运维管理的模式和方法进行了初步的探讨.