1,720,959 research outputs found
Finite element modelling for static and dynamic analyses of a low-cost microsatellite platform
No full textIn the Second Faculty of Engineering of the University of Bologna, the Aerospace group in Forli has started a new microsatellite research program, called Alma Mater Satellite (ALMASat) [1]. The satellite consists of a structure made of six shop-machined Aluminium trays, kept together by eight stainless steel bars. The power will be supplied by Silicon solar panels glued to four AI/AI honeycomb lateral panels. This modular architecture has been selected in order to have a multi-purpose bus, which can be used, with minor changes, for several different kinds of missions. This paper reports on the microsatellite structure design and manufacturing, and on the finite element modelling of this small platform, aiming to static, dynamic and thermal verifications. The first platform will be launched by a DNEPR missile; therefore the whole analysis has been carried out according to the Ukrainian-Russian requirements. Following a first set of analyses of a preliminary configuration of the platform structure, an optimisation of the layout has been carried out: a parametric model of the satellite has been created by means of three-dimensional CAD software. The parameters used in the optimisation procedure are: the tray thickness, the layout of lightening and their dimension, bringing to the final layout of the structure
Considerations on the environmental and social sustainability of animal-based policies
No full textThe contribution of the livestock sector to greenhouse gas (GHG) emissions as well as the worsening of animal welfare, with the intensification of production methods, have become increasingly relevant. Our contribution investigates the environmental impacts, in terms of methane and nitrous oxide emissions, of animal-based policies supported by the European Union. We examine factors affecting the adoption and the magnitude of related budget of Measure 215-animal welfare-of Rural Development Programmes 2007-2013. Our focus is cattle farming in Italy. The results highlight that the problem of animal welfare is highly perceived in regions with greater livestock intensity, also where GHG emissions are relevant. Given the adoption of measure 215, more budget tends to be allocated in regions where livestock units are particularly high. In addition, from the analysis emerges the bargaining position of regions with a higher propensity to the agricultural sector
On the environmental impacts of voluntary animal-based policies in the EU: Technical and political considerations
Full text linkThe livestock sector has a large influence on direct and indirect (via land use change) greenhouse gas emissions, with potential negative impacts on climate change. We quantify the environmental impacts related to the introduction of a voluntary animal-based policy supported by the European Union (EU), the Measure 14 of Rural Development Programmes 2014–2020 on animal welfare. In particular, we focus on methane and nitrous oxide emissions (direct impacts), and on carbon-based and nitrous oxide emissions from land use change (indirect impacts). Our case study is the dairy sector of the EU Member States. We found that the animal-based measures have (on average) limited environmental impacts, although marked differences exist across Member States
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
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
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