1,720,962 research outputs found
On the relationship between C-band interferometric coherence and crop phenology: Case study of Metaponto plain (Basilicata, Italy)
No full textIn this paper we discuss the use of Sentinel-1 interferometric Synthetic Aperture Radar (SAR) coherence to study the crop phenology. This research activity has been proposed within the project “On Demand Services for Smart Agriculture” (ODESSA)”, funded by the European Regional Development Fund (ERDF), Axis I Research and Innovation, Action 1B.1.2.1
Dynamic modal identification of telecommunication towers using ground based radar interferometry
Full text linkThis work presents a methodology to monitor the dynamic behaviour of tall metallic towers based on ground-based radar interferometry, and apply it to the case of telecommunication towers. Ground-based radar displacement measurements of metallic towers are acquired without installing any Corner Reflector (CR) on the structure. Each structural element of the tower is identified based on its range distance with respect to the radar. The interferometric processing of a time series of radar profiles is used to measure the vibration frequencies of each structural element and estimate the amplitude of its oscillation. A methodology is described to visualize the results and provide a useful tool for the real-time analysis of the dynamic behaviour of metallic towers
Valutazione del rischio da esposizione al piombo mediante studio della distribuzione granulometrica delle polveri aerodisperse che contengono piombo
No full text
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
Monitoring Strategies of Displacements and Vibration Frequencies by Ground-Based Radar Interferometry
No full textIn this work we present an overview of ground-based radar interferometry applications, using both real and synthetic aperture configurations, to measure deformations and vibration frequencies of infrastructures and terrain displacement due to geological phenomena. A short introduction to the basic principles of ground-based radar interferometry and the concept of interferometric coherence is provided. The interferometric processing of radar data provides the measurement of the Line-of-Sight (LoS) displacement with a sub-millimeter precision. In this paper we show results obtained in the monitoring of landslides, piers, dams, towers and bridges. Results have been obtained by means of a ground-based radar sensor working in the Ku-band with a range resolution of 0.75 m. Furthermore, we provide a review of literature on ground-based radar applications to volcano and glacier monitoring and measurement of vibration frequencies telecommunication and wind towers. The issues of measurement precision and artifacts due to propagation in the atmosphere are also 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
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