1,721,006 research outputs found
Nessuna salvezza per Jean Valjean: la giustizia secondo l’ispettore Javert. Recensione a L. Manconi – F. Graziani, Per il tuo bene ti mozzerò la testa. Contro il giustizialismo morale (Einaudi Stile libero, 2020)
No full textRecensione a L. Manconi – F. Graziani, Per il tuo bene ti mozzerò la testa.
Contro il giustizialismo moral
Optabam in manibus tuis anans spiritum dare: l'epitafio di Flavia Cyriace a Porto Torres
No full textSchede per una Lista Rossa della Flora vascolare e crittogamica Italiana: Bellium crassifolium Moris
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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
Safe approach of a small satellite with a large spacecraft. Analysis of nominal and off-nominal solutions
No full textPASSIVE ATTITUDE STABILIZATION STRATEGY FOR A 3U STUDENT CUBESAT
No full textCubeSats are increasingly being used for various space missions due to their low cost and fast delivery. While active attitude control systems, based on reaction wheels, are a valuable solution when precise pointing is required, they can be energy-intensive for a spacecraft with body-mounted solar panels and expensive for educational and fast-delivered missions. On the contrary, passive attitude control systems offer an attractive alternative that can reduce costs and improve reliability. This is particularly true when a reduced set of data should be sent to ground and the communication system can include low-directive antennas. This study addresses the challenge of passive attitude control for a 3U CubeSat in a communication mission, mostly designed and developed by students of Politecnico di Torino, emphasizing the importance of simplicity and lightness in the design process. To this end, we propose a passive attitude control system that leverages hysteresis rods made of a magnetic alloy with a low resistance to magnetization that allows an easy induction in the magnetic material enabling angular velocity damping. Additionally, a magnet is utilized to generate a magnetic dipole of 0.11 Am2 that aligns the satellite's long axis with the local magnetic field vector, simplifying the control system. The hysteresis rods and the magnet can be easily integrated into the satellite's structure, making the system highly robust and reliable. The proposed system is rigorously validated via simulations conducted using MATLAB and Simulink, with the aim of comparing the results obtained with data from an Inertial Measurement Unit (IMU) integrated within the satellite. The simulations demonstrate that the proposed passive attitude control system can maintain the satellite's orientation within a few degrees of the desired position, even in the presence of external disturbances. Along the orbit, the attitude is stabilized with a misalignment of the body axis with respect to Earth's Magnetic Field of 10 deg. Lastly, the simulations highlight that the released energy is dumped in less than 10 days. The proposed ACS configuration is mounted on board a 3U CubeSat planned to be launched in June 2023. It is expected to have results for the orbits to verify our solutions by the end of August 2023
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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