Durability of Bridge Expansion Joints with Perforated Dowels Under Traffic Impact Loading

In design phases, expansion joints are required to have movement capacity, bearing capacity for static and dynamic loading, watertight, low noise emission and traffic safety. On the basis of the fact that failure due to dynamic loading is the main reason for the observed damages, attention is focused on the bearing capacity for dynamic loading governed by impact, because it differs from the static loading. In this study, from the viewpoint of durability, experimental studies for. dynamic behavior were conducted for aluminium alloy expansion joints with perforated dowels. The validity of the perforated dowels against traffic impact loading was confirmed by both experimental and numerical studies.     

Design of bridge expansion joints with perforated dowels under impact loading

The expansion joints are expected to have movement capacity, bearing capacity for static and dynamic loading, water-tightness, low noise emission and traffic safety. In particular, the failure due to impact loading is the main reason for the observed damages. The problem of dynamic behavior of the expansion joints is so complex that we shall focus our attention on the impact factor for vehicle load that is governed by traffic impact. In order to overcome this difficulty, the cantilever-toothed aluminum joint (finger joint) is one of the promising joints under impact loading. In this study, from the viewpoint of design methodology, numerical studies for impact behavior were conducted for aluminum alloy expansion joints with perforated dowels. The design impact factor for the expansion joints with the perforated dowels against traffic impact loading was examined by using numerical simulations.     

优秀竞技武术套路运动员下肢力量发展模式

中国武术要进入竞技体育大家庭，运用现代训练理论来对武术运动训练进行调控已得到了认同。本主要应用Gybex等动肌力测试数据，确定优秀武术套路运动员的下肢等动肌肉力量特征，并以此作为运动员力量机能评价标准。并根据训练需要，运用测力台测试运动员负重半蹲快速上起力量，确定运动员的力量训练负荷强度，对运动员的力量素质进行阶段性测评。     

GH4169合金高温多轴低周疲劳寿命预测

基于临界面模型的方法提出一个新的(修正的)多轴低周疲劳损伤准则.该准则与目前的临界面法所不同的是,在预测多轴低周疲劳寿命的模型中,同时考虑临界面上最大剪应变和正应变在不同加载路径下对多轴低周疲劳损伤的贡献。试验结果表明,本文提出的多轴低周疲劳寿命预测模型,对于GH4169合金高温多轴疲劳寿命估算具有较高的准确性。     

基于VR的火箭炮装填训练模拟器的设计

针对某型火箭炮实装训练噪声大、磨损大、消耗高等缺点,提出了基于VR的火箭炮装填训练模拟器的设计,文中简述了模拟器的设计原则、总体结构,重点展示了模拟器的硬件构成、软件设计及模拟训练功能的实现,经教学试用,该模拟器达到了设计的要求。     

运用等微增原理实现机组负荷优化分配

介绍了九江发电厂三期2×350MW机组运用等微增原理,根据各机组微增煤耗制定出机组负荷优化分配方案,以指导机组负荷优化分配,实现经济调度和经济运行。同时,对进一步细化和改进负荷优化分配系统和方案,全面体现效益最大化,提出了建议和措施。     

新装卸工艺下双倍场吊的平板小车调度策略

为给高效智能型立体装卸集装箱码头生产调度系统提供1套双倍场吊的平板小车调度策略,以最小化平板小车运行时间为目标,构建动态规划模型,并采用简化算法减少求解模型的时间,使得模型及其求解能够满足实时作业的需要.新工艺下双倍场吊的平板小车调度系统通过减少岸吊和双倍场吊之间的运行距离和等待时间来提高集装箱码头的装卸效率.通过案例分析,新装卸工艺比传统装卸工艺的工作效率提高约7%.     

装载计算机操作中改善船体纵向受力状况的方法

介绍了在装载计算机操作中改善船舶纵向受力（切力和弯矩沿船长分布）状况的基本原理、操作步骤和操作实例。它为在装载计算机操作中如何选定合适的位置,采取调整货物（或集装箱）装载量或打、排压载水等措施来改善船舶切力和弯矩沿船长分布的状况提供了一种实用方法。     

关于梁端弯矩调幅问题的探讨

对框架结构梁端弯矩应如何调幅问题做一探讨，对以往设计提出修正性的建议。     

53例中老年长跑队员心电运动试验的分析

对５３例中老年长跑队员的活动平板功能负荷检查的结果进行了分析,认为中老年人参加长跑锻炼,对改善机体功能,延缓衰老,防止或减轻老年性疾病具有积极的促进作用;同时也强调加强对老年长跑队员医务监督和指导的重要性