1,720,980 research outputs found
EXCITE - A 12U Cubesat Mission for IOD/IOV
No full textEXCITE (“EXtended Cubesat for Innovative Technology Experiments”) is a technology demonstration mission selected by ASI in 2021 in the frame of the "Future Cubesat Missions" call. Based on a custom-designed 12U CubeSat platform featuring a full-composite structure, EXCITE is aimed at in-orbit demonstration / in-orbit validation of a number of innovative small spacecraft technologies in the domains of chemical and electric onboard propulsion, thermal management of significant heat loads in limited volumes, COTS GPU computing for IoT applications, and steerable, integrated S-band antennas. In this paper we describe the EXCITE platform design, outline the mission profile and discuss the main expected technological innovations
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
Attentional bias to infant faces might be associated with previous care experiences and involvement in childcare in same-sex mothers
Full text linkBackground: Attentional bias toward infant faces is associated with parental sensitivity and supports the infant-caregiver attachment relationship, ultimately fostering child health outcomes. However, experience-related determinants of parents' attentional bias to infant faces have been poorly investigated. We examined attentional bias to infant versus adult faces in a sample of same-sex mothers (N = 76), and whether it varied depending on maternal involvement in childcare and the perceived quality of past experiences of care. Method: A Go/no-Go attentional task was used to compare the effects of infant and adult faces in retaining attention. Maternal involvement in childcare was measured using items addressing nurturing behaviors. Memories of past experiences of care were collected using the short-form version of the Parental Acceptance-Rejection scale. Results: Results confirmed that infant faces induced greater attentional bias compared to adult faces. More involved mothers were more biased, in terms of attention, to infant versus adult faces. Attentional bias to infant versus adult faces increased as mothers felt more rejected by their own fathers during childhood. Discussion: Our findings suggested that attentional bias to infant faces might be associated with past experiences of care and direct commitment in childcare in same-sex mothers. Robust and accurate empirical findings on same-sex parent families are essential to inform social policies supporting these families’ well being
The patellar tendinopathy in athletes: a sonographic grading correlated to prognosis and therapy
No full textDispelling 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
Recent In-Flight Results with the MicroHAPS Near-Space Platform for Space Technology Testing
No full textDuring the last six years the Space Systems Laboratory of the University of Pisa has been developing a small, low cost, quick-access platform (microHAPS) for scienti c experiments and technology demonstration in the stratosphere. The team at UniPi designed, manufactured, tested, and flew successfully more than 25 stratospheric missions of increasing complexity, using COTS sounding balloons as the lifting device. This was made possible by the increased availability of high performance, low power microcontrollers and sensors, so that the limited mass lifting capability of traditional sounding balloons is now much less relevant in determing the operational capabilities of such vehicles.
The mciroHAPS platform features an altitude regulation system that allows the platform to dwell above 25 km for several days, thanks to a control system based on deep reinforcement learning. Power is provided by exible solar cells, providing for the needs of the payload and for supplying a reaction wheel attitude stabilization and pointing system. Full-duplex telemetry and telecommand is implemented using a LoRa spread-spectrum transceiver.
With a cost orders of magnitude smaller than space platforms, mciroHAPS is a sort of Cubesat of the stratosphere, well suited to act as a test bench for microsatellite technologies. With 2 to 3 kg of payload, a large variety of experiments can be conducted in near-space conditions: at 30 km air pressure is around 20 mbar, temperature is -60 C, insolation is almost exactly Air-Mass-Zero, most of ionizing radiation is unshielded, and the field of view towards the surface of the Earth is hundreds of km in all directions.
While not full representative of the LEO environment, the higher stratosphere is nevertheless an excellent environment for testing of space technologies, allowing for significant TRL increase with extremely low cost, quick and repeatable access.
Among others, technology missions own so far by our team include the analysis of the EM background noise at 868 MHz and 2.4 GHz (for IoT applications of the ISM bands); detection of AIS signals form ships in the Mediterranean; analysis of nocturnal light pollution in urban areas; and I/V curve characterization of innovative solar cells. We report on the lessons learned and outline the next design features and the expected performance of the microHAPS system as a test bench for microsatellite technology
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