多媒体、网络技术下大学英语读写模式及其效果研究

本文在建构主义理论框架下,讨论了学习者自主学习能力、学习策略、教师角色及教学模式等问题;在教学实验的基础上,形成了基于多媒体、网络技术的大学英语“阅读＋写作”课堂教学模式。支持度调查和学生成绩对比结果反映出其教学效果良好,它对于促进我校大学英语教学改革具有积极意义。     

我国汽车营销模式演变趋势的系统动力学研究

在对营销模式内部要素和环境因素分析的基础上,构建汽车营销模式格局演变的系统动力学模型,研究未来几年内我国汽车营销模式的格局在各种内外部因素的共同影响下发展变化的趋势,得出未来5~10年特许经营模式将在我国汽车市场占主导地位,同时其它营销模式将呈现不同的发展态势,并认为营销模式受互联网发展和政策因素影响最显著。     

高等学校课堂教学中存在问题及对策

文章分析传统与多媒体两种教育模式的内涵及功能特点,指出高等院校课堂教学中存在问题,探讨问题解决方法,强调教师应提高两种模式的科学认识。同时也指出实际教学中应根据教学内容、教学对象、教师水平合理将两种教学模式有机结合,有效提高课堂教学效果。     

Nonlinear dynamic response of blast-loaded stiffened plates considering the strain rate sensitivity

The aim of the present paper is to develop a simple theoretical method which can quickly calculate the nonlinear dynamic response of stiffened plates under a blast loading. The large deformation behavior of the stiffened plate is analyzed by using a singly symmetric beam model as representative of the stiffened plate. The material is assumed to be rigid-perfectly plastic, and the strain rate sensitivity is considered by using the Cowper–Symonds constitutive model (CS model). By Lee's extremum principle, the instantaneous modes of nonlinear structural response are determined. A series of calculations are performed to investigate the influence of pulse intensity, pulse duration, plate thickness, stiffener spacing and material property on the displacement response. The obtained results are in good agreement with those of numerical simulations performed by software package ABAQUS, and then a definition for the cases when the simplified method proposed here can be used is provided.     

关于城市轨道交通运营维修施工计划管理模式研究

城市轨道交通运营维修施工是一项非常重要的运营生产组织活动,一个合理、科学的运营维修施工计划管理模式既可以确保维修施工安全、提高维修施工作业效率,又可以减少对正常运营的影响程度和范围。本文通过对国内已开通轨道交通城市运营维修施工计划管理模式的分析、探讨,研究厦门轨道交通运营维修施工计划管理模式。     

乡镇达标渡口建设管理模式的探讨

本文以鲜码村为例,总结了做好渡口渡船专项整治工作,积极探索建设管理达标渡口途径,完善整合以村带渡,"以奖代补"建渡,交通、海事扶渡的三种发展模式,加快渡口达标进程的经验。     

车用锂电池PP隔膜机械失效导致内部微短路的机理研究

车用锂电池在工作过程中会经受机电热的耦合作用,其中机械滥用是引发锂电池内部短路的最主要风险之一,很可能导致严重的起火事故。隔膜的机械完整性是防止锂电池在机械滥用条件下发生内部短路的关键因素。通过综合的力学测试发现,不同尺寸的压头导致PP隔膜两种截然不同的变形和失效模式。最后分析了触发锂电池内部微短路的机理,并通过力学试验和理论分析提出了锂电池内部微短路下的隔膜临界位移准则。     

Do modes of transportation and GPS affect cognitive maps of Londoners?

Legibility has long been recognized as an important factor in creating a good image of a city in individuals’ minds. This image is perceived to assist people in understanding the city, finding their way, and recalling the city. The quality of the image affects individuals’ abilities in way-finding. This is especially important for cosmopolitan and global cities such as London in order to preserve resources and time, manage travel costs, limit pollution (air or noise) and enhance these cities as places to live, work and visit. This research examines the cognitive maps of London drawn by a sample of its residents to discover how different modes of transportation and GPS usage could affect individuals’ urban images. Such research is useful for town planners, local government departments, and urban and transport planners because of the way it considers the legibility of London as and provides a tool to study individuals’ urban images. 101 participants were recruited with at least a two-year residency from both genders (38.6% females and 61.4% males) with the average age of 33.88 and S.D. = 10.63. The results suggest car use has a positive correlation with seeing London in city scale and GPS usage has a negative correlation. Whilst recent studies have shown that there are differences between active travel modes (e.g., walking, bicycle riding or driving a car) and passive modes (e.g., as a passenger taking a bus, train or taxi), this study indicates that GPS usage also influences cognitive maps, with a negative correlation found between GPS usage and drawing maps on a city scale. Other significant associations were found for the car drivers with a positive relation with the number of roads mentioned on the maps, seeing London in city scale and having a two-dimensional façade image of the city in mind.     

可持续发展的综合交通运输系统构成模型研究

在确立各种运输方式可持续发展评价指标体系的基础上,设计出信息熵法与灰色关联度评价法相结合的组合评价模型,运用该模型对各种运输方式的可持续发展能力进行评价,并据此建立可持续发展的综合交通系统构成模型,为创建可持续发展的综合交通运输提供定量化的指导方案,实现交通与环境、能源、社会、经济的和谐发展.     

无砂混凝土在铁路工程中的应用研究

无砂混凝土作为一种新型的功能型建筑材料,宏观大孔对其力学性能影响显著,与传统混凝土相比无砂混凝土在强度增长、复合纤维增强及经历荷载后的破坏形式等方面体现出更多的不确定性,其配合比设计、结构特点及力学特性更接近水泥稳定碎石基层及沥青混凝土。通过现场大量试拌,当水灰比0．30、浆体体积占总体积的30％左右时28d抗压强度可满足C20等级的设计要求。