1,720,963 research outputs found
Computation of the Characteristic Impedance and Cutoff Frequencies of the Suspended Strip in Elliptical Cross-Section
No full textUnisat Microsatellites Power System
No full textThe UNISAT program, an educational project with the aim to involve students, researchers and professors in designing, manufacturing and operating in orbit small microsatellites, has been established at Scuola di Ingegneria Aerospaziale of Università di Roma “La Sapienza” in early nineties. In the framework of this project three microsatellite have been launched from Baikonour cosmodrome. The fourth one, UNISAT-4, is scheduled for launch in December 2005.
Most of the UNISAT satellites components are based on commercial off the shelf (COTS) components.
This paper describes the UNISAT microsatellites power system, based on terrestrial technology solar arrays. An experiment using terrestrial solar arrays in orbit was hosted on UNISAT-1. Based on the experience matured, improvements have been introduced in the development of the UNISAT-2 and UNISAT-3 solar arrays.
The procedures developed to make low cost solar array, based on terrestrial technology, withstand launch and space environment loads are described. In particular UNISAT-3 hosts a number of solar arrays based on different technologies, including mono-crystalline silicon high efficiency solar cells and multi-junction solar cells, in order to compare their behavior in orbit. Data collected for the on-orbit tested solar cells are discussed.
Moreover a general overview of the UNISAT-3 microsatellite power subsystem is reported and the on orbit functioning is described
Attività amministrativa e sindacato giurisdizionale nell’Unione europea: l’esempio della concorrenza
No full textIl contributo analizza la portata del sindacato giurisdizionale delle corti comunitarie vis a vis le decisioni amministrative. A riguardo, la concorrenza è di particolare interesse. Infatti, l'elevato tecnicismo che caratterizza il settore e la circostanza che la Commissione sia responsabile di sviluppare la politica comunitaria di concorrenza limitano fortemente la possibilità per le Corti di verificare la correttezza delle valutazioni - specie quelle di tipo economico - compiute nell'ambito dei procedimenti antitrust. Da un lato, si pongono problemi di natura tecnica; dall'altro, vi è l'esigenza di rispettare le competenze assegnate dal Trattato
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
- …
