1,720,961 research outputs found
ENVIRONMENTAL MONITORING BY MEANS OF HYPERSPECTRAL CAMERAS ON BOARD THE CUBESAT
No full textThe aim of this research project is the feasibility study of an innovative hyperspectral, with stereo capability, instrumentation of some CubeSat units, or in any case in a miniaturized SmallSat perspective, defining the possible system design for the purposes of terrestrial remote sensing, Earth observation from space, in particular for environmental monitoring and natural resources, or so that the feasibility study can be extended to the observation of other celestial bodies in the exploration of the solar system. One of the proposed integrated activities is the identification of an opto-mechanical solution for HYPSOS, for its possible application at CubeSat level and aimed at terrestrial planetary mapping (EO-HYPSOS) together with an industrial partner EIE GROUP. The research relating to the Hyperspectral Instrumentation on board Small Satellite/CubeSat, carried out by analyzing also past missions, currently underway and those planned for the near future, is aimed not only at evaluating the state of the art of the associated instrumentation but also at being able to find innovative solutions from a scientific and technological point of view aimed at satisfying new research needs in line with the Grant project. The bibliographic research highlights that there are several satellites currently in orbit around the Earth, or in the process of being defined, that allow remote observations; but as regards the instrumentation for CubeSat, the application horizons can be further expanded from a design and construction point of view. In fact, in most cases in the past the satellites were large, placed in orbit with extremely complex and sophisticated instrumentation. Other possible applications are highlighted on satellites defined as SmallSat/CubeSat for different levels (declinations) of imaging units, therefore for different resolution levels
Optical design and optimization of a hyperspectral-stereo camera for CubeSat
No full textThe Hyperspectral Stereo-Camera for CubeSat (HSCC) is a novel instrument for remote sensing able to simultaneously extract 4D information, three spatial and one spectral, using the two channels of a pushbroom stereo camera coupled to a suitable spectral filter. HSCC is designed to be a very compact instrument, compatible with CubeSat applications, to be suitable for planetary exploration as well for terrestrial environmental monitoring. In this paper we describe the optical design of HSCC, show its nominal optical performance, and give indications about the performed optimizations. The system consists of a very compact innovative layout (1-Unit CubeSat) aimed at optimizing overall dimensions and masses, in which the two stereo channels, looking forward and backward along track with respect to nadir, share both a three-mirror anastigmat telescope and a bidimensional detector. The spectral analysis of the observed target is realized by the combination of the pushbroom scan and a linear variable filter put in front of the sensor: in fact, each linear field of view projected on the sensor moves along the filter dispersion direction following the satellite orbit and is spectrally selected by the local filter bandpass. The spectral selection coupled to the three-dimensional scene obtained by the stereoscopic view provides a global 4D result, allowing to get simultaneously from a single instrument a complete set of information of the observed surface usually attainable by at least two different instruments, so avoiding the typically very cumbersome cross-calibration and co-registration issues
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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