W波段折叠波导慢波结构设计及三维注波互作用模拟

本文综合分析了折叠波导的几何尺寸和电子束参数，运用电磁场软件MAFIA的粒子模拟程序对三维折叠波导慢波结构进行了模拟．模型中，电磁波通过波导模式导入；为了克服较大空间电荷效应造成的电子注发散，使用了纵向聚焦磁场．基于三维互作用模型得到了W波段折叠波导的模拟结果，该结果可以对折叠波导慢波结构的三维互作用性能进行预测和分析．     

人脸面部表情自动识别技术的研究进展

近年来，面部表情识别技术已成为模式识别领域中的一个重要的研究课题，因此表情识别的研究进展也受到了更多的关注。首先介绍了表情识别技术的背景及目前的研究进展，然后介绍了一些表情识别的主要的方法，并介绍了面部表情识别技术的难点，最后对表情识别技术进行了展望。     

结构撞水的流固耦合动力分析

结构的撞水是流固耦合相互作用的瞬态过程.本文采用有限元法,就三维楔形体结构对带自由表面流场的撞水过程进行了数值模拟.楔形体结构简化为V型折板,流场和结构分别采用欧拉网格与拉格朗日网格,进行流固耦合动力分析的迭代求解.在此基础上开展参数化研究,探讨了撞水速度、板厚、斜倾角以及材料参数对撞水过程的影响.分析的结果与有关文献的实验结果比较吻合,为撞水结构的强度分析与设计提供了参考.     

A Robust Macroelement Model for Soil–Pile Interaction under Cyclic Loads

The principal focus of this study is the development of a robust macroelement model for soil–pile interaction under cyclic loads. The model incorporates frictional forces and formation of gaps at the soil–pile interface as well as hysteretic behavior of the soil. The plastic envelope of the soil behavior is modeled via the so-called p–y approach, outlined in American Petroleum Institute’s guidelines for design of foundation piles for offshore platforms. The macroelement is an intuitive assembly of various basic elements, each of which incorporating a particular aspect of the soil–pile interaction. The modular structure of this macroelement allows straightforward adaptation of improved constitutive models for its building blocks. Herein, we focus on large-diameter, cast-in-drilled-hole reinforced concrete piles (piers) that are partially or fully embedded in soil. These types of piles are frequently used as support structures in highway construction. Consequently, the numerical robustness of the interaction model is assessed with parametric studies on pile systems and soil types relevant to this type of construction. Both elastic and inelastic pile behaviors are considered in the parametric studies. The results indicate that the proposed interaction element is numerically robust, and thus, amenable to routine structural analysis.     

Transport Property of La0.67-xSmxSr0.33MnO3 at Heavy Samarium Doping (0.40≤x≤0.60)

The influence of heavy samarion (Sm) doping(0.40≤x≤0.60) on magnetic and electric properties of La0.67-xSmxSr0.33MnO3 was investigated by measuring the magnetization-temperature (M～T) curves, magnetization-magnetic density (M～H) curves, resistivity-temperature(ρ-T) curves and magnetoresistivity-temperature(MR～T) curves of the samples under different temperatures.It is found that, with the increase of Sm doping amount, the samples transform from long-range ferromagnetic order to spin-cluster glass state and anti-ferromagnetic state;and when x=0.60, the transport property becomes abnormal under magnetic background;and the magnetic structure changes and extra magnetic coupling induced by doping leads to colossal magnetoresistance effect.The transport mechanism of metallic conduction at low temperature is mainly electron-magneton interaction and can be fitted by the formula ρ=ρ0 AT4.5, and the insulator-like transport mechanism on high temperature range is mainly the function of variable-range hopping and can be fitted by the formula ρ=ρ0exp(T0/T)1/4.In the formulas above, ρ is resistivity, T is temperature, and A, ρ0, T0 are constants.     

Pushing the Distribution Model to its Limits: Distributed “listening” in a Helpline

Our case study explores the extent to which a “Distributed Cognition”-like ethnographic approach can be used to analyze situations which are not at first sight compatible with the precepts of computational cognition. In the first part of the paper, we analyze the collective listening of phone calls in a helpline. We show why collective listening can be considered a “distributed collective practice”, with a mode of coordination based on repeated verbal re-enactments of difficult phone calls, rather than upon the discrete computational steps normally assumed in the standard model. In the second part of the paper, we analyse the organizational and interactional learning which takes place when collective listening is re-mediated by using e-mail exchanges rather than telephone conversations to communicate distress. Our conclusion discusses critically the viability of the distribution model in a context of collective listening.     

《数据结构》互动式教学探讨

《数据结构》是计算机相关专业的必修、主干课程之一,其旨在使学生学会分析研究数据对象的特性,学会数据的组织方法,以便选择合适的数据逻辑结构和存储结构,以及相应的运算(操作),把现实世界中的问题转化为计算机内部的表示和处理,这是一个良好的程序设计技能训练的过程。在整个教学或学习过程中,解题能力和上机实验的训练是一个重要的环节。本文从教学实践出发,结合学生的特点,对本课程的教学方法进行了一些探讨。     

浅谈flash中的交互动画编程

本文针对flash中的交互动画部分作了初步的探讨，重点介绍了交互动画编程中怎样使用鼠标、键盘来与计算机实现简单的交互动画。     

多媒体技术在工程制图课件制作中的应用

利用多媒体技术开发数据量小并且易于发布工程制图教学软件，实现教学软件的模块化、网络化，主要介绍了制作和发布的方法厦其优点，并结合应用说明使用效果．     

Wearable vibrotactile systems for virtual contact and information display

This paper presents a development history of a wearable, scalable vibrotactile stimulus delivery system. This history has followed a path from desktop-based, fully wired systems, through hybrid approaches consisting of a wireless connection from the host computer to a body-worn control box and wires to each tactor, to a completely wireless system employing Bluetooth technology to connect directly from the host to each individual tactor unit. Applications for such a system include delivering vibrotactile contact cues to users of virtual environments, providing directional cues in order to increase situational awareness in both real and virtual environments, and for general information display in wearable contexts. Through empirical study, we show that even a simple configuration, such as eight tactors arrayed around the torso, can be effective in increasing situational awareness in a building-clearing task, compared to users who perform the same task without the added cues.