1,720,966 research outputs found
Aerodynamic design and analysis of an innovative regional turboprop configuration
No full textThe Innovative turbopROp configuratioN (IRON) project complies with the European Union topic JTI-CS2-2015-CPW02-REG-01-03 (Green and cost efficient Conceptual Aircraft Design including Innovative Turbo-Propeller Power-plant) as part of the Clean Sky 2 program for Horizon 2020. The topic leader is Leonardo, CIRA (Italian Aerospace Research Center) is the coordinator and several core-partners are involved into the project. The research work is focused on the feasibility study of an innovative turboprop aircraft configuration with rear engines installed on the horizontal tailplane. This paper deals with the aerodynamic design and analyses carried out during the first loop of design concerning the baseline configuration provided by Leonardo Company.
Major activities have been addressed to the design of the wing airfoil and to an efficient high lift system (including the possibility of a morphable drooped nose). Winglets have been specifically designed to improve the climb performance concurrently reducing the induced drag in cruise condition.
The complete aerodynamic database assessment has been performed also by means of high fidelity analyses, such as CFD-RANS simulations, to estimate the isolated wing high lift capabilities (flap up and flap down) and the fuselage aerodynamic characteristics. To assess the complete aircraft trimmed drag polar database,
a detailed weight and balance analysis has been performed. This analysis has shown that for this innovative configuration, the center of gravity excursion is very large, highlighting the inadequate sizing of the horizontal tailplane to trim the aircraft in the whole center of gravity excursion range. To overcome this issue, different aircraft
configurations have been considered. Among them also three lifting surfaces has been considered. This latter has been identified as the most promising solution to best comply with the provided aerodynamic requirements
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
Multi-disciplinary analysis and optimization Java tool for aircraft design
Full text linkThe first stages of the aircraft design process require to carry out multi-disciplinary analyses as fast as possible, and with a certain grade of accuracy. During the conceptual and the preliminary phases, the goal is to search for the design that best fulfils the requirements. This work presents a Java framework, named JPAD, developed at the University of Naples Federico II by the Design of Aircraft and Flight technologies research group (DAF) to perform multi-disciplinary analysis and optimization of transport aircraft. This paper describes all the JPAD capabilities, focusing on the sensitivity analyses and optimization modules. At the end, a case study concerning the optimization of a regional turboprop aircraft model similar to the well-known ATR72 will be presented
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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