1,721,008 research outputs found
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
Feasibility of a satellite microwave radiometer to mitigate tropospheric effects in SAR interferometry
No full textAnalysis of aerosol optical depth retrieved by MODIS and MERIS and comparison with photometer data
No full textIn this work a validation of aerosol optical depth (AOD) values provided by two different satellite sensors (MODIS and MERIS) is proposed. A comparison between satellite and ground-based AERONET data is carried out to verify the reliability of spaceborne instruments. Finally the behaviour of AOD is analyzed monitoring particular events such as desert dust transport occurred on the 9(th) of October 2004 over the Mediterranean
Validation of near infrared satellite based algorithms to retrieve atmospheric water vapour content over land
No full textThis paper presents the validation results of ENVISAT MERIS and TERRA MODIS retrieval algorithms for atmospheric Water Vapour Content (WVC) estimation in clear sky condition on land. The MERIS algorithm exploits the radiance ratio of the absorbing channel at 900 nm with the almost absorption-free reference at 890 nm, while the MODIS one is based on the ratio of measurements centred at near 0.905, 0.936, and 0.94 mu m with atmospheric window reflectance at 0.865 and 1.24 mu m. The first test was performed in the Mediterranean area using WVC provided from both ECMWF and AERON-ET. As a second step, the performances of the algorithms were tested exploiting WVC computed from radiosoundings (RAOBs) in the North East Australia. The different comparisons with respect to reference WVC values showed an overestimation of WVC by MODIS (root mean square error percentage greater than 20%) and an acceptable performance of MERIS algorithms (root mean square error percentage around 10%)
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
Monitoring of atmospheric water around precipitation events using a scanning ground-based microwave radiometer
No full textThis work considers the use of a dual-frequency, ground-based microwave radiometer with scanning capabilities to investigate the behaviour of the atmosphere in terms of precipitable water vapour and integrated cloud liquid before precipitation events
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