基于性能的防屈曲支撑在既有建筑抗震加固中的应用研究

简要介绍了基于位移的防屈曲支撑抗震加固简化算法,结合一幢6层既有综合楼进行实例分析,并通过弹塑性时程分析予以数值验证。结果表明,简化算法能够快速进行支撑用量估计,其减震效果与时程分析结果基本一致。     

张力膜结构初始形态分析的曲面四边形单元

张力膜结构的初始形状不能随意选择,它必须符合平衡条件和建筑使用要求。根据几何非线性有限元理论,提出张力膜结构初始形态分析的8结点曲面四边形等参单元。通过建立曲线坐标,在应变的线性部分引入法向位移及单元曲率和扭率的影响,推导了张力膜结构的单元刚度矩阵和结点力列阵。采用完全的Newton-Raphson迭代法求解非线性方程组。数值算例表明该单元是一种高效、稳定和可靠的单元。     

选煤厂溜槽减振降噪的设计与应用

通过对选煤厂溜槽噪声的分析,介绍了几种在选煤生产中常用的溜槽减振降噪方法,并阐述了各方法的减振降噪原理与特点,为选煤生产中溜槽噪声的治理提供了借鉴。     

轻钢结构刚架支撑设计

简要介绍刚架支撑的设计原理,提出刚架支撑的设计方法及节点构造。根据《钢结构设计规范》(GB 50017-2003)选取合适的纵向水平位移容许值,并用一工程实例加以说明。     

曲面间隙测量电涡流传感器探头的热效应研究

平面电涡流线圈是应用于特殊装备中复杂曲面间隙测量的重要器件。为保证使用的安全,利用有限元温度场分析方法,对平面电涡流线圈在曲面体层间的热效应进行了研究,仿真计算了温度与时间、电流之间的关系曲线,并进行了实验验证。研究发现,线圈的节点温度随时间上升并达到平衡状态,而平衡温度随电流增加而提高,同时给出了不同安全温度条件下线圈的最大允许电流。研究结果为曲面间隙测量电涡流传感器探头的安全应用提供了理论依据。     

A Novel Artificial Superposition Compound Eye

A new artificial superposition compound eye model is presented based on micro-lens array. In all compound eyes, it has the advantages of small volume, light weight, wide FOV, high sensitivity and much higher energy utilization ratio. Nevertheless, its structure is relatively complicated, especially the GRIN medium in the crystalline cone. Therefore, the modeling, analysis and fabrication for it are burdensome. In the established model, the GRIN is replaced by a curved micro-lens array. Thus, the modeling, analysis and optimization process are simple, and the components of artificial superposition compound eye are easy to be fabricated. The system is modeled by ZEMAX software. With the help of raytracing, its principle is analyzed, and the sensitivity comparison between the superposition compound eye and the apposition compound eye is done. The model＇ s validity is proven.     

弯晶谱仪中用的多丝正比室

本文叙述了多丝正比室弯晶谱仪的应用特点、装置及其工作原理。给出了多丝正比室的结构及各项性能指标。测量了装置对铁的K_α特征线,达到了分开铁的K_(α1)和K_(α2)特征线的目的。     

Hope, self-efficacy, and functional recovery after knee and hip replacement surgery.

Objective: To test hypothesized relations between hope and self-efficacy for rehabilitation to depression and functional ability reported by individuals receiving joint replacement surgery. Study Design: Community-dwelling older adults (N = 100) from an orthopaedic clinic were administered measures of hope, self-efficacy for rehabilitation, pain, depression, body mass index (BDI), and mental status 1 month prior to their joint replacement surgery. These measures were completed by 62 participants 6 weeks after surgery. Demographic, health information, and functional outcome measures were obtained by medical personnel pre- and postsurgery. Main Outcome Measures: Functional outcome measures (Harris Hip and Knee Society Scores) and depressive symptomatology. Results: Hope was significantly predictive of presurgery depression, but it was not predictive of depression or functional ability after surgery. Higher levels of self-efficacy were predictive of lower postsurgery depression scores. Conclusions: Results imply that social-cognitive constructs may have utility in the prediction of emotional adjustment before and after joint surgery, but they may have limited value in anticipating functional abilities following these surgeries. Theoretical and clinical implications are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

3D打印腰部健康护具设计研究

目的 通过对3D打印材料与技术的概述、腰部健康护具市场需求的分析,探索3D打印技术与传统医疗护具设计结合的可能性,思考个性与适应性、艺术与功能性、单价与制造速度的平衡与协调。方法 以腰部健康护具为研究切入点,借助SLS、SLA打印技术,重点关注可成型工艺(同一材料的3D打印设计改良),对增加造型可塑性以及更为概念性的设计方略层面进行研究。结果 基于使用、技术、个性三方面的需求,设计了具备磁疗功效和定制特点的3D打印腰部健康护具。经实验测试,佩戴性良好,各项指标达到了设计预期。结论 未来的3D打印发展方向,材料研究仍将是重点,除了材料的多元化、智慧化,技术的互动、增效也会进一步刷新人类社会的制造观念;有效利用3D打印技术的便捷性特点和可定制特点,势必成为未来“可定制化”无障碍产品设计重要的研发和探索方向。