1,720,973 research outputs found
Internal and external corrosion of lighting columns: a people’s safety problem
No full textThe so-called "indirect losses" caused by corrosion significantly overcome the direct costs
sustained for replacing corroded structures, and industry and local municipalities are charged
for annual costs amounting to several billion euros.
The internal and external corrosion of lighting columns, however, is not merely an economic
problem: in the last few years, all over Europe, deaths and injuries involved hundreds of
persons struck by falling lamp posts.
The paper makes the point on the multiple causes of lighting columns corrosion, sometimes
unpredictable but most often consequence of improper design or incorrect maintenance
procedures, and describes the most updated techniques available for rapid and reliable
identification and assessment of corrosion occurrences which cannot be revealed by simple
visual surveys, such as internal or below-ground corrosion phenomena.
Results of a comprehensive experimentation carried out both in laboratory and on-site on a
number of lampposts located both in the urban and coastal areas of the city of Rome are also
reported in the paper, together with useful recommendations for the design and maintenance
of these components
Prediction of durability for outdoor exposed bronzes: Estimation of the corrosivity of the atmospheric environment of the Capitoline Hill in Rome
No full textThe evaluation and control of the durability of bronze monuments exposed outdoors in urban environments are urgent and technically complex topics. The possibility of predicting the behaviour of a metal artifact in contact with water and polluted air in particular climatic conditions is of fundamental interest for both corrosion scientists and conservators. In the present paper, the results of an investigation into the corrosivity of the atmosphere on the Capitoline Hill in Rome are summarized, evaluated on the basis of the mass loss results of standard metallic specimens exposed in situ. The use of the technique of polarization resistance is proposed for the objective evaluation of the real state of health of bronze sculptures in terms of actual rate of corrosion in progress on the metallic surface. Particular attention is paid to the results obtained for the Marcus Aurelius equestrian monument, exposed on this site for the past five centuries
Prevenzione della corrosione dei trefoli delle strutture in calcestruzzo armato post-teso mediante uso di inibitori di corrosione nella malta di riempimento delle guaine
No full textUno dei motivi di possibile corrosione a carico dei trefoli che costituiscono il rinforzo di strutture in cls armato post-teso è la formazione di vuoti all’interno delle guaine, dovuta a pompaggio inefficiente della boiacca cementizia o a bleeding. All’interno dei vuoti si crea un’atmosfera umida in grado di attaccare l’acciaio diminuendo la sezione dei fili e quindi in ultima analisi mettendo i ferri in condizioni di raggiungere il carico di rottura. Per prevenire o contrastare questo tipo di danneggiamento è possibile ottimizzare la qualità delle malte utilizzate per il riempimento delle guaine, utilizzando inibitori di corrosione volatili
A Critical Examination of the European Standard EN 1504 “Products and Systems for Protection and Repair of Concrete Structures”
No full textThe European Standard EN 1504 “Products and systems for protection and repair of concrete structures — Definitions,
requirements, quality control and evaluation of conformity” can be considered a real milestone for the companies involved in the
rehabilitation of buildings, bridges, piers, pipelines, and other civil or industrial concrete structures. However in some cases the
examination and, even more, the practical application of the proposed guidelines are made difficult by a complicated sub-division in
principles and methods, and by a confusing and repetitive layout. The paper deals in particular with the principles and methods for the
rehabilitation of concrete damage due to reinforcement corrosion, often strictly connected, anyway, to those adopted in order to
rehabilitate the concrete itself. Suggestions are given for a possible future update of the Standard, based on the personal experience of
the Authors
Valutazione dei fenomeni corrosivi in corso sulla superficie della statua equestre dell'Imperatore Marco Aurelio
No full textIl monumento equestre in bronzo di Marco Aurelio ha recentemente subito un intervento di restauro che ne ha rimesso in luce la patina naturale e parte della doratura superficiale. In vista di una possibile ricollocazione della statua sulla Piazza del Campidoglio di Roma, è stato intrapreso uno studio sulle condizioni attuali di conservazione e sui più idonei metodi di protezione superficiale
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Critical examination of European Standard EN 1504 for products and systems for concrete protection and repair
No full textThe European Standard EN 1504 "Products and systems for protection and repair of concrete structures - Definitions, requirements, quality control and evaluation of conformity" can be considered a real milestone for the companies involved in the rehabilitation of buildings, bridges, piers, pipelines, and other civil or industrial concrete structures. However in some cases the examination and, even more, the practical application of the proposed guidelines are made difficult by a complicated sub-division in principles and methods, and by a confusing and repetitive layout. The paper deals in particular with the principles and methods for the rehabilitation of concrete damage due to reinforcement corrosion, often strictly connected, anyway, to those adopted in order to rehabilitate the concrete itself. Suggestion are given for a possible future update of the Standard, based on the personal experience of the Authors
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
- …
