多媒体技术在小学数学教学中的作用

科学技术的日新月异发展,推动了素质教育的进程,多媒体技术已经走进了课堂,本文阐述了小学数学教学应用多媒体技术,激发了学生浓厚的学习兴趣,化解了教学重点难点,营造了良好的氛围,优化了课堂教学,提高了课堂教学效率。     

易在河南

伏羲,中华民族人文始祖,是我国古籍中记载的最早的王,所处时代约为新石器时代早期,他根据天地万物的变化,发明创造了八卦,成了中国古文字的发端,也结束了“结绳纪事”的历史。他又结绳为网,用来捕鸟打猎,并教会了人们渔猎的方法,发明了瑟,创作了《驾辨》曲子。他的活动,标志着中华文明的起始,也留下了大量神话传说。     

多媒体-小学数学教学的得力助手

多媒体技术的发展使小学数学教学模式发生了根本性变化。课堂体现了学生的主体性原则,多媒体的应用丰富了教学内容,灵活了教学方式,点燃了学生思维的火花,提高了学生听课效率,有效解决了数学教学中的重难点,多媒体是小学数学教学的得力助手。     

柴油发电机励磁绕组的改进

本文介绍了柴油发电机组励磁系统出现的故障及原因,设计了新的励磁装置,并制定了使用控制措施,通过实践检验,排除了类似故障,从而保证了工程施工的安全、质量、进度和效益,取得了较好的经济效益。     

70 m以上空心高墩施工的温度应力应变控制

介绍了关家沟特大桥工程概况,分析了桥墩轴线的放样施工,提出了施工中消除温度影响的控制技术,并进行了理论计算,对该技术的现场应用情况进行了探讨,得出了该方法正确的结论,为同类工程积累了经验.     

盘点城市

近些年,河南城乡建设取得长足进步,给我们留下太多的惊喜和惊奇。花园多了,建筑高了,广场大了,道路宽了,河道治理了,污水少了,绿化率提高了……     

2012年中国建材素质拓展掠影

这是一次心的历练,一段生命的体验,一堂寓意深远的课程,更是值得永远铭记和感恩的回忆。两天的拓展训练里,我们洒下了汗水,收获了成功;留下了眼泪,带走了感动;战胜了恐惧,建立了信心;突破了极限,坚实了凝聚力。探索与思考,祝福与欢笑,分歧与统一,遗憾与启迪,在我们的合力协作中愈显珍贵。两天的拓展训练完满结束,这是每一个人的胜利,更是集体的胜     

翻转课堂在初中英语高效课堂构建中的作用

随着信息技术与英语教学的深度整合,翻转课堂教学这一新的教学模式进入了英语教学,有效解决了如何创设英语语境的问题,为学生提供了丰富的个性化英语学习语境,使不同层次的学生都得到了发展与提高。由于教师将学习的权利交给了学生,学生成为了学习的主体,构建了有效教学评价机制,实现了多元化、全方位的英语教学评价。     

小型热回收装置的可行性研究

通过回收排气中的余热对引入空调系统的新风进行预热或者预冷,可以减少空调系统的能耗。分析了不同装置的原理和性能特点以及适用性特征,初步探讨了热回收设备配置的合理性并举例说明了其节能效果,从而论证了应用的技术可行性。提出了一种简易的经济分析计算方法,评价了经济效果,论证了经济可行性。得出了小型热回收装置用于暖通空调系统可行的结论,并展望了乐观的应用前景。     

小学英语课堂教学中师生互动存在的问题及对策

师生互动作为目前在小学英语教学中非常重要的教学手段,真正让教师和学生都获得了实惠,不仅拓宽了教师的课堂教学思路,创新了教学理念,同时也打造了更具"人性化特征"的课堂,让学生对英语学习产生了浓厚兴趣,让学生的英语核心素养有了明显提升。本文简要对小学英语课堂教学师生互动研究背景进行了分析,在此基础上,探究了目前师生互动教学中存在的问题,并提出了几点针对性解决措施。     

Modeling Sorption Transport In Rooms And Sorption Filtration Systems For Building Air Quality Analysis

Adsorption, desorption and chemisorption are known to impact the dispersal of volatile organic and chemically reactive compounds in buildings. These same three processes may be used to advantage to control the levels of these compounds indoors using building sorption filtration devices. To add to the understanding of these processes, to provide the means to predict the impact of these processes on human exposure and to provide the tools needed to design gaseous filtration systems to mitigate the exposure to these compounds, a general approach to modeling the dynamics of these processes is presented. Equations are presented to account for the elemental advection, diffusion, sorption, and chemical transport steps affecting single component sorption dynamics in rooms and sorption filtration systems. These element equations are based on general principles and formulated in terms of fundamental physical parameters that may be determined using standard procedures. Models to predict room and sorption filtration system dynamics are formulated using assemblages of these element equations and a series of simplified models of these systems are derived. Initial applications to model single-component sorption transport in rooms and sorption filtration systems indicate that the approach has the potential to provide accurate predictions providing the sorption and chemical characteristics of the sorbate-sorbent system being considered are well-characterized. This potential is, however, compromised by the lack (or present uncertainty) of fundamental data relating to sorption equilibrium, porous diffusion, surface chemistry, and boundary layer mass transport     

基于节理产状不确定性的边坡稳定性及敏感度分析

用Monte Carlo法对服从Fisher分布的节理产状进行模拟,计算每个模拟产状的安全系数,并统计拟合安全系数的分布规律及边坡的可靠度。为同时考虑安全系数对节理倾角和倾向的敏感度,提出了以安全系数对节理面法向矢量球面距离的敏感度来反映其对产状敏感度的分析方法,并建议用平均值和最大值两个指标来反映任意产状的敏感度。用赤平投影方法在赤平图上绘制安全系数等值线图和敏感度等值线图,实现了计算结果的可视化展示。算例分析表明：此方法实现了对节理产状不确定性的全面直观分析,消除了产状测量数据离散化可能造成的安全隐患,解决了以往产状敏感度分析中需单独对倾角或倾向分析的不足。     

Uplift of elastomeric bearings in isolated bridges subjected to longitudinal seismic excitations

Bearings are used to isolate bridge substructures from the lateral forces induced by creep, shrinkage and seismic displacements. They are set in one or two support lines parallel to the transverse axis of the pier cap and are typically anchored to the deck and to the pier cap. This detailing makes them susceptible to possible tensile loading. During an earthquake, the longitudinal displacements of the deck induce rotations to the pier caps about a transverse axis, which in turn cause tensile (uplift) and compressive displacements to the bearings. Tensile displacements of bearings, due to the pier rotations, have not been addressed before and questions about the severity of this uplift effect arise, because tensile loading of bearings is strongly related to elastomer cavitation and ruptures. An extended parametric study revealed that bearing uplift may occur in isolated bridges, while uplift effect is more critical for the bearings on shorter piers. Tensile displacements of bearings were found to be significantly increased when the isolators were eccentrically placed with respect to the axis of the pier and when flexible isolators were used for the isolation of the bridge. The results of this study cannot be generalised as bridge response is strongly case-dependent and the approach has limitations, which are related to the modelling approach and to the fact that emphasis was placed on the longitudinal response of bridges.     

常低温下EGSB处理生活污水的影响因素研究

在15～26℃的常低温条件下,采用EGSB处理生活污水,考察了进水流量、回流比、液体上升流速(Vup)、温度等因素对运行效果的影响。结果表明,当温度为26℃左右时,对于9～11 L/h的低进水流量,宜采用高回流比(1.6～2.5),对COD的去除率最高可达90%;对于15～24L/h的高进水流量,宜采用低回流比(0～0.6),对COD的去除率最高可达84%;当进水流量提高至30 L/h时,不宜回流,对COD的去除率降至77%;当进水流量分别为9、11、15、24、30 L/h时,最佳Vup分别为4.0、(3.1～3.6)、(2.7～3.4)、3.0和3.8 m/h,此时对COD的去除率分别高达90%、(87%～89%)、(83%～84%)、83%和77%;在无回流的条件下,适宜的进水流量为15～24 L/h,相应的HRT为0.5～0.8 h。当温度为15～26℃时,EGSB适宜的运行条件是高进水流量(15～24L/h)、高Vup(3.0 m/h)和低回流比(0～0.6),此时对COD的去除率高达81.9%以上。     

Normen für den Konstruktiven Ingenieurbau

Codes in Structural Engineering In structural engineering codes are of essential importance. Codes have to represent accepted rules as well as the state of the art in science and technology and they provide a basis for the communication between all involved professionals. In codes of the future all procedural steps of planning have to be included – design, execution, service, conservation and dismantlement – and an integral approach to safety and quality has to be adopted. In comparison to present codes, the technical breadth and the level of detail will increase. Nonetheless, the overall aim of code writers shall be to come up with regulations that are easy to understand and to apply. Codes of the future have to (re‐)gain their significance and acceptance.     

超高路堑边坡治理工程案例研究Ⅱ:治理对策及其过程控制

概述了K227滑坡治理工程方案,对该滑坡分"上、中、下"三段进行施工的全过程开展数值模拟与优化分析,并与监测反馈信息相互印证,指导了边坡施工的过程控制,达到了超高路堑边坡治理"一次规划、分步推进、安全实施、不留后患"的工程控制目标,并得到以下结论:(1)将综合工况下边坡整体稳定系数F_s=1.10作为施工过程稳态控制的标准,以实现超高路堑边坡稳态控制,保证施工安全及其支护结构的耐久性;(2)坡脚反压是超高路堑边坡施工过程中确保其具备临时稳定的必要条件,应谨慎选择对此类临时安全措施调整的时机和节奏;(3)双排锚索抗滑桩方案的预先规划和及时生效,对于控制施工期间后山牵引变形发展和边坡稳定条件弱化,保证施工过程安全及成功治理具有重要的作用;(4)超高路堑边坡治理过程中存在多种潜在失稳机制,以及局部和整体变形相互转化的问题,需要进行多方案模拟优化,实现局部和整体变形的协调控制;(5)路堑高边坡动态设计与信息化施工需要由边坡变形破坏驱动设计调整的被动模式,转化为模拟及预测边坡变形发展规律,实现施工次生病害的主动控制。     

露天矿山高陡岩质边坡生态修复技术的应用现状与发展趋势

矿产尤其是石材矿产的开发必然会对原矿区的环境造成破坏，容易形成矿山高陡岩边坡，即白茬山。白茬山由于坡度高、坡面长以及坡面温差大等原因，易形成恶劣的生存环境，很难实现有效的植被附着，长期复绿效果充满挑战。对此类生态环境中的常见复绿技术的研究现状进行了介绍，分析了不同技术的优缺点及使用机制。进一步根据白茬山的地质、地形和地表等特征，进行生态修复技术的优化与改进，展望修复技术的发展趋势，助力生态系统的恢复与发展。     

Numerical parametric investigation of infiltration in one-dimensional sand–geotextile columns

Geotextiles are routinely used in separation and filtration applications. Design of these systems is currently based on saturated properties of the geotextiles and the surrounding soils. However, in the field, soil and geotextile can be in an unsaturated state for much of their design life during which they are essentially hydraulically non-conductive. Periodic wetting and drying cycles can result in rapid and large changes in hydraulic performance of soil–geotextile systems. The writers have reported the results from physical water infiltration tests on sand columns with and without a geotextile inclusion. The geotextile inclusions were installed in new and modified states to simulate the influence of clogging due to fines and to broaden the range of hydraulic properties of the geotextiles in the physical tests. This paper reports the results of numerical simulations that were undertaken to reproduce the physical tests and strategies adopted to adjust soil and geotextile properties from independent laboratory tests to improve the agreement between numerical and physical test results. For example the paper shows that the hydraulic conductivity function of the geotextile must be reduced by up to two orders of magnitude to give acceptable agreement. The lower hydraulic conductivity is believed to be due to soil intrusion that is not captured in conventional laboratory permeability tests. The calibrated numerical model is used to investigate the influence of geotextile and soil hydraulic conductivity and thickness as well as height of ponded water at the surface on wetting front advance below the geotextile and potential ponding of water above the geotextile due to a capillary break mechanism. A simple analytical model is also developed that predicts the maximum ponding height of water above the geotextile based on two-layer saturated media and 1-D steady state flow assumptions. The analytical model is used to generate a design chart to select geotextiles to minimize potential ponding of water above the geotextile. Ponding can lead to lateral flow of water along the geotextile in reinforced wall, slope, embankment and road base applications.     

探求大学校园新旧建筑及环境的和谐共鸣——以辽宁科技大学校园扩建及改造为例

当前大学校园改扩建工程中存在着新旧建筑及建筑与环境如何协调的问题,本文以辽宁科技大学新校区的扩建及旧建筑的改造为例,通过理论研究和实例剖析,总结归纳了处理大学校园新旧建筑关系及建筑与环境相互协调的5种手法:确立中心、协调、对比、存留及整合景观与环境。本文结论进一步丰富和提高处理新旧建筑与校园环境协调方面的经验和手法,可为广大关注大学校园建设问题的相关人员提供借鉴和参考。     

城市与记忆:心理学视维中的城市历史延续与发展

所有的城市都包含了记忆的因素。城市的记忆作为一种宝贵的资源，通过显性物质实体与化心理潜质在现实、未来中存在、变化与延续着，它成为城市人感知、体验与理解自身与其生存环境在时间因素中延承变换的基本脉络线索。但是，在城市大规模的改造与更新进程中，城市记忆的人为破坏与丧失已经再也不能使城市成为人们记忆中那熟悉的家园和故乡。为了避免割断和扭曲城市的历史，保持城市个性的统一性与完整性，塑造城市精神的真实性与独特性，对城市进行类似于心理学精神分析的记忆分析方法不失为一种研究城市历史延续与发展的科学方法。本试图在心理学的范畴为城市历史延续与发展研究提供一个视角，从城市记忆这个更为内在和深层的结构上对于当前城市建设中存在的一些问题进行剖析。