1,720,963 research outputs found
Geomechanical characterisation of fault rocks in tunnelling: The Brenner Base Tunnel (Northern Italy)
No full textThe goal of this study is to characterise the rock faults involved in the excavation works of the Brenner
Base Tunnel, which crosses one of the main tectonic alignments of the alpine area, the Periadriatic fault.
The characterisation was carried out at different scales from macro (through drillings and geomechanical
surveys) to meso (lab tests on specimens) and micro-scale (through thin sections), in order to find a correlation
between the different scales properties of the rock masses. Finally, a relation between the voids
ratio at the micro-scale and the fault rocks conditions at the meso and macro-scale was pointed out. As a
result, by means of the Hoek–Brown method, an estimation of the fault rock strength was achieved, tending
to avoid quite a typical overestimation arising from the use of literature values
Handbook on Tunnels and Underground Works: Volume 1: Concept–Basic Principles of Design
No full textThe book provides a new, global, updated, thorough, clear and practical risk-based approach a global, updated, thorough, clear and practical new risk-based approach to tunnelling design and construction methods, and discusses detailed examples of solutions applied to relevant case histories. It is organized in three sequential and integrated volumes:
• Volume 1 ‘Concept – Basic Principles of Design’
• Volume 2 ‘Construction – Methods, Equipment, Tools and Materials’
• Volume 3 ‘Case Histories and Best Practices’
The book covers all aspects of tunnelling, giving useful and practical information about design (Vol. 1), construction (Vol. 2) and best practices (Vol. 3). It provides the
following features and benefits:
• updated vision on tunnelling design, tools, materials and construction
• balanced mix of theory, technology and applied experience
• different and harmonized points of view from academics, professionals and contractors
• easy consultation in the form of a handbook
• risk-oriented approach to tunnelling problems.
The tunnelling industry is amazingly widespread and increasingly important all over the world, particularly in developing countries. The possible audience of the book
are engineers, geologists, designers, constructors, providers, contractors, public and private customers, and, in general, technicians involved in the tunnelling and underground works industry. It is also a suitable source of information for industry professionals, senior undergraduate and graduate students, researchers and acade
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
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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