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……     

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。     

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.     

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。     

聚合物改性砂浆耐久性的试验研究

正交试验表明,聚合物干粉改性砂浆相对普通砂浆,折压比增加了69%,粘结强度增长了22.48倍,最大渗透压增加了6个级别,失水率下降了34.8%,干缩率减少了16%,明显改善了砂浆性能.     

大国重器 节能先锋——徐工集团2014成套绿色节能道路机械新品挺进东北

正此次徐工重磅推出的"先进、可靠、节能、高效"成套绿色节能道路机械,不但提高了能源利用率,减少了油耗,进而为用户大幅降低了成本,而且降低了排放,保护了环境,以"节能环保"优势在市场竞争中占据了主动地位。     

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。     

给水管网漏损的检测措施及原因分析

介绍了管网漏损的检测方法,结合实际描述了相关检测法在检漏中的具体应用,针对漏损进行了成因分析,并提出了相应对策.     

大线径导线恒张力架设技术

研究了高速铁路大线径导线恒张力架设技术,分析了其原理、机械及技术,给出了整套架设方案,实践证明,采用该施工工艺后,提高了施工效率,节约了材料及其他费用,取得了非常理想的效果。     

Book Reviews

Book Reviewed in this article:
Affordable Water Supply and Sanitation. Proceedings of the 20th WEDC Conference, Colombo, Sri Lanka, 22–26 August 1994. Edited by J. Pickford, P. Barker, A. Coad, T. Dijkstra, B. Elson, M. Ince and R. Shaw.
Contaminated Land , by Stephen Tromans and Robert Turrall-Clarke.
E.C. Treaty and Environmental Law , by L. Kramer.
Mixing and Transport in the Environment. (Eds. Keith Bevan, Philip Chatwin and John Millbank.)
Stream Ecology, Structure and Function of Running Waters , by J. David Allan.
Operation and Maintenance of Urban Water Supply and Sanitation Systems: A Guide For Managers. Written for, and published by, the World Health Organisation.
Integrated Solid Waste Management: A Lifecycle Inventory , by Peter White, Dr-Ing Marina Franke and Peter Hindle.
Report 142: Control of Pollution from Highway Drainage Discharges. By Martin Luker and Keith Montague with contributions from 11 other individuals.
Tables for the Hydraulic Design of Pipes, Sewers and Channels. H. R. Wallingford and D. I. H. Barr.
The Ecological Basis for River Management. (Edited by D. Harper and A. Ferguson.)
Waste Incineration and the Environment. Issues in Environmental Science and Technology 2. (Eds. R. E. Hester and R. M. Harrison.)     

珊瑚礁礁灰岩工程特性测试研究

珊瑚礁是一种特殊的岩土类型。运用现场钻探、标准贯入试验、波速测试、平板载荷试验等勘探手段和方法,对沙特红海珊瑚礁礁灰岩进行了含水率、重度、抗压强度等室内试验,分析研究了珊瑚礁礁灰岩的物理力学性质及相关关系。测试研究表明:岩芯采取率、岩石质量指标和标准贯入试验可以评价珊瑚礁礁灰岩沿深度的岩土性能变化特征;珊瑚礁礁灰岩具有结构多变、多孔、重度小、性脆、强度低且变化大等工程特性;珊瑚礁弹性波传播速度小,而珊瑚碎屑岩和珊瑚状石灰岩具有较高的弹性波波速;载荷试验p-s曲线与其他岩土不同,随着荷载的增大,礁灰岩空隙发生了脆性破坏,岩土被压密。测试成果可供礁灰岩的进一步研究和工程应用参考。     

Book Reviews

Book Reviewed in this article:
Pollution in the UK, by Denise Franklin, Professor Neil Hawke and Mark Lowe. Published by Sweet and Maxwell
Low-Cost Sanitation, by John Pickford.
Waste Treatment and Disposal. Issues in Environmental Science and Technology. 3. (Eds. R. E. Hester and R. M. Harrison.)
Drilling for Water - A Practical Manual, by Raymond Rowles.
The Environmental Guide to Pollution Control Technology. Published by Caldicott Morgan
Environmental Impact Assessment for Waste Treatment and Disposal Facilities, by Judith Petts and Gev Eduljee.
Environmental Health Law, by Prof. Neil Hawke.
Risk and Opportunities - Managing Environmental Conflict and Change, by Valerie Brown, D. Ingle Smith, Rob Wiseman and John Handmer.     

Book reviews

Promoting local growth: process, practice, and policy. Daniel Felsenstein and Michael Taylor (eds.)
Governance, institutional change and regional development. M. Danson, H. Halkier, and G. Cameron (eds.)
Institutions and systems in the geography of innovation. (Economics of Science, Technology and Innovation). M.P. Feldman and N. Massard (eds)
Job Access, Workplace Mobility, and Occupational Achievement. Maarten van Ham     

基于问卷调查的人文地理与城乡规划人才培养改革研究

人文地理与城乡规划专业综合人文地理和城乡规划的学科背景和专业知识,其专业内涵和外延的界定、课程体系的构建等问题一直存在。西部地区地方院校基于地理学背景开设的人文地理与城乡规划专业,往往面临专业定位、课程设置、学生能力培养等方面的思考。从学生自身层面反馈问题与建议,能更好修正自上而下教学改革的局限性。文章以南宁师范大学人文地理与城乡规划专业为例,结合本科生调查问卷分析,对课程设置、课时安排、课程内容、培养方法等方面进行调整。     

Foundation connections for circular concrete-filled tubes

Concrete filled steel tubes (CFTs) promote economical and rapid construction. They offer increased strength and stiffness relative to structural steel and reinforced concrete. The steel tube serves as formwork and reinforcement to the concrete fill, thereby reducing the labor requirements. CFT components encourage the optimal behavior of each material (concrete and steel) while providing a symbiotic relationship between the two to mitigate undesirable failure modes. The fill increases the compressive strength and stiffness, delays and restrains local buckling of the tube, and enhances ductility and resistance if composite action is achieved.Both rectangular and circular CFT have been employed, but circular CFT provide better performance, because they provide increased confinement of the concrete and composite action. A missing component for circular CFT construction is reliable and ductile connections. The research described herein that investigated and develops design procedures for simple and economical connections of circular CFT piers or columns to reinforced concrete foundations, pile caps and wide cap beams (bridge construction) is presented and evaluated. The connection requires no dowels or internal reinforcement connecting the tube to the footing or cap beam. Experiments and analytical studies evaluate the inelastic seismic performance and establish design criteria for the connection. The seismic performance of a CFT column and connection assembly is compared to a conventional reinforced concrete column. The research shows that the proposed connection develops the full capacity of the composite column. The assembly provides excellent ductility and inelastic deformation capacity under seismic loading while mitigating damage even at larger drift demands.     

国内外住区空间环境对居民健康影响研究综述

住区作为城市基本单元,良好的规划建设在改善人居环境和引导居民的健康生活习惯上具有基石作用,为深入解析住区外部空间环境对居民的健康影响,促进公众健康,追踪梳理了国内外相关主题文献,辨析了住区空间对居民健康影响的要素系统和影响路径,归纳了用地与设施、空间形态、交通与街道、绿色空间四类空间要素对居民健康的影响,发现相关健康影响并非仅是简单的正负线性相关,还存在显著的地域差异、多因素影响特征和阈值非线性相关性,进而探讨了相关研究的结论与方法在住区规划建设过程中的运用。     

Book Reviews

Business, Pollution and Regulation, by S. Simpson and J. Carless.
Chlorinated Organic Micropollutants. Edited by R. E. Hester and R. M. Harrison.
Contaminated Land and its Reclamation. Edited by R. E. Hester and R. M. Harrison
Dam Hydraulics, by D. L. Vischer and W. H. Hager.
Environmental Health Criteria No. 177: 1, 2-Dibromoethane
Life Cycle Design: A Manual for Small and Medium-Sized Enterprises
Marine Debris: Sources, Impacts and Solutions. Edited by J. M. Coe and D. B. Rogers.
Resource and Environmental Management, by B. Mitchell.     

Interaction of Programming and Design: The First Unitarian Congregation of Rochester and Louis I. Kahn

This essay investigates the relationship between programming and design. It exposes and criticizes those views that characterize programming and design as separate and their relationship as linear. Instead, we propose that the relationship is interactive and that the clarification of programmatic and design issues goes hand in hand. During this interactive process both client and architect take significant responsibilities. The design process of the First Unitarian Church of Louis Kahn is an illustrative example. Investigation of the client's reports, of Kahn's and the client's letters, and of Kahn's design proposals exposes the client's contribution and the interaction between programming and design. Our study suggests that clients have the potential to play crucial roles in design and deserve credit.     

传统村落活态化保护利用的多元路径建构——以环太湖地区周铁传统村为例#br# #br#

在乡村振兴战略背景之下，针对当下“凝冻式”保护利用导致的传统村落活力缺失、日渐破败和空心化的严峻问题，基于环太湖传统村落的深入调研，从“三生”融合发展的视角出发，构建空间维度和时间维度相结合的活态化保护利用多元路径。其中，空间维度的多层级路径由村落整体格局、建筑单体和室内环境三个层级构成；时间维度的历时性路径由近期、中期和远期相结合的方式渐进推进，时间和空间维度的路径相互交织作用，共同实现传统村落活态化保护利用。最后以环太湖地区周铁传统村示范工程建设为例阐述了上述多元路径的实践应用，进行了兼具一定的前瞻性和实操性的探索。