Nb/V复合强化对高强度钢筋显微组织和性能的影响

采用金相显微镜（MM）、扫描电镜（SEM）、透射电镜（TEM）、万能拉伸试验机等对高强度钢筋的显微组织、第二相、断口和力学性能进行表征和试验.结果表明：3种试验钢筋的显微组织均为铁素体+珠光体,其中3^#试验钢筋中还含有少量贝氏体;3^#试验钢筋中主要析出物为铌钒复合碳氮化物（（Nb,V） （C,N））,呈圆形状,平均粒径为10 nm,在铁素体晶界和珠光体片层间析出;3种试验钢筋的拉伸断口均为韧性断裂,断口上分布着等轴韧窝;随着Nb含量的增加,试验钢筋的抗拉强度和屈服强度增加,但其断后伸长率有所降低;3^#试验钢筋的抗拉强度和屈服强度最大,分别为795、525 MPa,断后伸长率较1^#和2^#试验钢筋小,为21.6%.     

Computer-aided qualitative data analysis: panacea or paradox?

Following the methodological debate within the construction management research community in the 1990s, research studies adopting inductive methodologies have increased. Many such projects have adopted computer-aided qualitative data analysis in order both to facilitate the research process and to ensure methodological rigour and transparency. However, there remains a paucity of critical discourse within the construction management research literature about the impact of such approaches on the depth and rigour of the resulting analyses. This paper posits that so-called computer-aided approaches have the potential to affect detrimentally the outcomes of construction management research if researchers see such tools as a panacea for ensuring the rigour and transparency of their work. Paradoxically, computer-aided approaches often restrict rather than aid the analytical process. The paper draws upon the authors' experiences of using a leading package from which a number of considerations for the use of computers in qualitative data analysis are discussed. It is concluded that the research community would benefit from an open debate on whether computer packages really do provide a panacea to the analysis of qualitative data in applied construction management research projects or whether their use merely provides a label with which to convince sceptical positivists of the rigour of inductive research techniques.     

From Product to Process: Building on Urban-Think Tank’s Approach to the Informal City

Adriana Navarro-Sertich interviews a pioneer of the informal in architecture, co-founder and co-director of Urban-Think Tank (U-TT) Alfredo Brillembourg . Brillembourg explains how U-TT's work seeks to connect informal settlements with the formal city, enabling inhabitants to access services and infrastructure. U-TT is now taking the lessons it has learnt in working in Latin American cities, such as Caracas and São Paulo, elsewhere in the world with the aim of ‘working globally and acting locally’. Copyright © 2011 John Wiley & Sons, Ltd.     

City as Political Form: Four Archetypes of Urban Transformation

Pier Vittorio Aureli focuses on the category of archetype as an alternative to the idea of type. Four examples – the axial streets of Renaissance Rome, the 17th-century Parisian place, the 19th-century independent block in Berlin and the 20th-century Viennese superblock – are explored here to describe the emergence of modern urban forms that explicitly embody power relations.     

Pharmaceuticals, personal care products and endocrine-disrupting chemicals in U.S. surface and finished drinking waters: A proposed ranking system

This study developed a comprehensive ranking system, for the first time as per authors' knowledge, for prioritizing the monitoring of pharmaceuticals and personal care products and endocrine-disrupting chemicals (together termed as EOCs, hereafter; a total of 100 EOCs considered) in U.S. stream water/source water and finished drinking water (termed as “EOCRank,” hereafter). The EOCRank system was developed using a total of 4 criteria: (1) occurrence, (2) treatment in drinking water treatment plants, (3) ecological effects, and (4) health effects and characterized using 7 attributes: prevalence, frequency of detection, removal, bioaccumulation, ecotoxicity (for fish, daphnid, and algae aquatic indicator species), pregnancy effects, and health effects. The health effects attribute was characterized using 7 sub-attributes: carcinogenicity, mutagenicity, impairment of fertility, central nervous system acting, endocrine effects, immunotoxicity, and developmental effects. Rank scores of EOCs were calculated as summations of multiplications of importance weights and utility functions of multiple criteria and were arranged to highlight EOCs needing immediate attention. Two different ranking lists of EOCs were developed for U.S. finished drinking water and stream water/source water and observed to differ with each other, indicating the effect of water type on ranking of EOCs. A ranking list of priority EOCs, developed using a particular criterion, was observed to differ with that, developed using multiple criteria. Health effects and treatment criteria were observed to be important criteria influencing overall data gap rank scores and need further data collection. The generalized nature of the system could be customized for specific geographical locations (occurrence information and importance weights of different components). The developed database of the EOCRank system is available on: http://www.egr.msu.edu/~xagorara/research.html).     

Arlotti-Beccu-Desideri-Raimondo

Currently one of the most active offices in Rome, Arlotti-Beccu-Desideri-Raimondo (ABDR) has seven major projects under way or at the point of completion. Massimo Locci explains why, despite being theoretically and methodologically rigorous, the practice's work cannot be readily categorised. Unique in its combination of a purist Modernist language with an aptitude for expressive informality, the office is also proactive in its adoption of bioclimatic technologies and its understanding of new communication models. Copyright © 2007 John Wiley & Sons, Ltd.     

Selected Italian Projects

Rationalism remains at the sidelines of contemporary architecture in Italy – a latent current rather than a leading force. Andrew Peckham and Lucia Tozzi reveal how this stubborn but rich seam is manifesting itself: in Cino Zucchi's substantial housing scheme on the outskirts of Milan; Werner Tscholl's insertion into Schloss Sigmundskron/Castel Firmiano; Beniamino Servino's continued work on the Nursery School in Formicola, Caserta; and C+S Associati's Nursery School at Covolo di Pederobba in Treviso. Copyright © 2007 John Wiley & Sons, Ltd.     

Outside the Terrestrial Sphere Greg Lynn FORM: N.O.A.H. (New Outer Atmospheric Habitat) and New City

Renowned architect and educator Greg Lynn describes two projects - N.O.A.H, a science-fiction film, and New City, a design exhibit at the Museum of Modern Art (MoMA) in New York - that directly ‘engage the theme of Space Architecture as the new frontier for design research in terms of the spatial character and navigation of environments with alternative gravities’.     

Linking the Formal and Informal: Favela Urbanisation and Social Housing in São Paulo

São Paulo is Brazil's largest city with over 20 million inhabitants, 14 per cent of which live in informal settlements. Here author, critic and editor Fernando Serapião describes various housing initiatives led by Elisabete França during her two stints at the city's Secretaria de Habitação (SEHAB – Housing Secretariat), which employed design as a tool to upgrade and more fully integrate the city's favelas in the formal city.