1,721,164 research outputs found
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
TRA DUE E TRECENTO. Lingua, testualità e stile nella prosa e nella poesia
No full textThe volume collects twenty-four essays primarily on the syntax, style and textuality of medieval literary Italian in prose and verse texts. Among the works studied to describe syntactic structures and functions are canonical texts such as the poetry of the Scuola siciliana, Dante’s Commedia and Convivio, and Boccaccio’s Decameron, as well as minor and non-literary works. The focus is on instruments of argumentation coherence and pragmatic efficacy on the basis of an exhaustive collection of examples. Attention is paid throughout to the social and historical context. The book begins with a survey of thirteenth-century prose examined in its textual and genre typology and concludes with an assessment of three of Boccaccio’s tales considered in stylistic and textual terms
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
A new configuration of vertical axis wind turbine: an overview on efficiency and dynamic behaviour
No full textPreliminary results obtained for a new configuration “lift based” vertical axis wind turbine are shown. The turbine rotor is a cross flow fan type characterized by an high solidity and having the blades made of high curvature aerodynamic profiles which allow it to start at very low wind speed. A reduced scale model ( Rotor diameter = 250mm, rotor height = 210mm , 24 blades ) has been tested at the Department of Aerospace Engineering of Pisa showing an efficiency of about 18%.
During the test a complete analysis of its aeroelastic response has been carried out through the use of four strain gauges properly placed. Good correlation with FSI and rotor dynamic analyses have been obtained. Furthermore steady and unsteady CFD simulations have been carried out using Ansys Fluent® Rel.14 and STAR-CCM+® Rel. 6.04 with the Moving Reference Frame and Moving Mesh techniques. CFD analyses confirm the results and give important information about its behaviour and the aerodynamic loads to which it is subjected. Noticeable scale effects have been found numerically, so, the efficiency of a full scale lift based vertical axis optimized wind turbine is expected to be comparable with lift based horizontal axis wind turbine, i.e. around 30%.
A full scale model of diameter = 1m and height = 1m is currently under construction and will be tested in field in order to validate the numerical results. An efficiency of about 22% is expected. Since its optimal angular velocity decreases as the scale increases, vibrational phenomena for the full scale model are supposed to be almost null. Due to its simplicity and its principle of operation, hydrodynamics applications are also quite promising
Coastal resilience potential as a coefficient of the coastal erosion risk assessment, and the management of risk areas via nature-based solutions
Full text linkClimate change has now become a global problem since the level of awareness of civil society has grown. Even non-professionals have understood that this phenomenon is strongly influenced by human activities and by local or specific dynamics, which exacerbate its effects, especially in the case of coastal environment conservation. Coastal erosion is a natural process that is exacerbated by climate change and is considered a natural hazard since it threatens the safety of humans and their properties. As with other natural hazards, such as fire and hydraulic, the risk of coastal erosion is mainly driven by urban spreading and inadequate land management. There are numerous proposals in the scientific literature based on good practices, guidelines and studies on the assessment and management of coastal erosion to solve the problem. However, coasts around the world are still experiencing significant imbalances, and future forecasts on this issue are even more pessimistic. On a technical level, numerous solutions have been tested in recent decades. Unfortunately, these alternatives have been fundamentally oriented towards the construction of hard coastal engineering structures, which instead of solving the problem, on many occasions have created new phenomena of instability such as the generation of coastal narrowing and the translation of erosive phenomena along the coast. Solutions were proposed and tested considerably, during the last century; almost everywhere they comprised hard structures of coastal engineering that instead of solving the problem, created new instabilities, such as coastal squeezing and erosive shifting. These consequences, and the trends observable on the world's shores, have required the conversion of coastal engineering into a more sustainable discipline that strongly supports natural resilience. More generally, resilience represents the ability of natural systems, such as a coast, a community or an individual, to cope and respond to a traumatic event by drawing on their own resources. As for the loss of the beaches, this intrinsic character must allow the system to use the sedimentary stock, to rebalance the dynamics and feedbacks coming from each of its physical and biological components. This would allow the beach to "jump back" and reach the morpho-dynamic equilibrium it had in the phase preceding the erosive trauma. This work proposes an integrated method for calculating the resilience potential that can address both the assessment and management phases of coastal erosion risk. The proposed evaluation methodology comprises the use of innovative technologies, such as geographic information systems (GIS) for the mapping and spatial analysis of morphological trends, integrated in the analysis of economic and social dynamics. Such matrices differ greatly due to their different nature but must be considered as the product of vulnerability and exposure in risk assessment. Adopting an approach oriented to the use of multi-parametric indices, the resilience potential was calculated and integrated into the vulnerability assessment. This is essential as from a regulatory point of view areas exposed to natural hazards must be transformed into low risk levels to improve their natural stability before their use. In this regard, the coastal strip of the Municipality of San Vincenzo (Livorno, Italy) has been mapped and its potential use and regulation have been evaluated independently of purely economic or political approaches. However, this still represents a great challenge as the economy plays a strong role in valuation formulas, as well as management plans, which for these reasons are rarely decisive. The study was tested within the Interreg MAREGOT Project, of which the Department of Earth Sciences of the University of Florence is a partner. Initially a morphodynamic evaluation of the studied site was carried out, followed by the drafting of a morpho-sedimentological map. These activities were carried out at the Laboratory of Applied Geomorphology of the Center for Geotechnology (CGT) of the University of Siena. Subsequently, the morphological trends and the economic parameters examined were converted into diagnostic indicators of territorial change, at the Department of Civil Engineering of the Polytechnic University of Cartagena (Spain). The results highlight that an assessment of the resilience potential is not only necessary to address the effects of climate change, but it is mandatory to plan corrective actions that quantify the real capacity of coastal areas to cope with extreme events. Furthermore, in anthropized coastal environments the high density of concessions for recreational activities, the high price ranges of services, and the construction of buildings on the coastal area imply significant limitations that can be related to both social and morphological risks. The most important ones concern free access, the exercise of the right to swim, as well as the provision of a right of possession of the built works to the concessionaires, and subsequently the duty to protect them (by the administrations) through rigid works in emergency conditions. climatic. As already mentioned, these works are generally to be considered as the last alternative, as they can give rise to phenomena of contraction of the coastal strip at a local level, and sometimes cause the loss of some habitats. The European Commission's EU market regulation rules have sometimes highlighted the existence of shortcomings in the management of state-owned concessions in the maritime field. Indeed, in Italy they are generally automatically renewed to concessionaires for indefinite periods, without considering its implications on sedimentary dynamics of the coast. As already mentioned, this has influenced coastal engineering and urban planning on the territory of the entire Italian state. Hence, the Nature Based Solution tested in this study consists of a method that includes the potential for resilience in the management of areas subject to coastal erosion. This phenomenon is analyzed in terms of socio-morphological vulnerability on a local scale (beach), since it represents the administrative dimension within which this procedure is most applicable, and in which the concept of risk is linked to the loss of sedimentary stock. The approach adopted is oriented to the use of multi-parametric spatial indices through GIS tools, and shows the applicability of the method that allows to identify areas with different potential for relative resilience. Furthermore, it allows to generate territorial management strategies on a local scale consistent with the existence of morphological and social vulnerabilities.Escuela Internacional de Doctorado de la Universidad Politécnica de CartagenaPrograma de Doctorado en Tecnología y Modelización en Ingeniería Civil, Minera y AmbientalUniversidad Politécnica de Cartagen
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