1,720,959 research outputs found
Metodologia per la caratterizzazione spettrale delle superfici saline e delle aree interessate da aspersioni sabbiose tramite proximal sensing e remote sensing in Tunisia
No full textLo studio presenta i primi risultati di una ricerca svolta nell’area di Medenine, Tunisia meridionale,
mirata alla caratterizzazione spettrale delle superfici saline e delle aree interessate da aspersioni
sabbiose, di particolare interesse poichè limitano le attività agro-pastorali. Sono stati acquisiti i dati
spettrali con uno spettroradiometro da campo e parallelamente sono stati prelevati campioni da
sottoporre ad analisi diffrattometriche. I punti di campionamento sono stati scelti sulla base
dell’analisi morfologica, dei dati spaziali ancillari e della mappatura di copertura/uso del suolo
specificatamente realizzata per questo studio su imagini Landsat 8. Il settore analizzato (400 000
ettari) è stato validato con una campagna a terra di 400 punti di controllo. La campagna spettrale ha
permesso l’acquisizione delle misure di riflettanza di 34 punti, di cui 14 punti per le superfici saline
(con 9 campioni); 10 punti per le aree di aspersioni sabbiose (10 campioni); 3 punti per la
vegetazione specifica (sia alofita, che psammofita) e 7 punti per superfici miste. Le firme spettrali
acquisite sono state elaborate per essere importate nella piattaforma web SPECCHIO per il
confronto con misure acquisite in ambienti simili. Le analisi difrattometriche sono state concluse
per i campioni salini e hanno permesso di definire la componente mineralogica specifica della
risposta spettrale rilevata sul campo. Questo studio propone un modello di analisi spettrale basato
sull’utilizzo integrato di dati acquisiti da proximal e remote sensing finalizzato al monitoraggio dei
fenomeni di land degradation. Lo studio presentato fa parte delle attività del progetto WADISMAR,
un progetto dimostrativo finanziato dalla Commissione Europea attraverso il Sustainable
Water Integrated Management (SWIM) Programme (http://www.wadismar.eu).This paper presents the preliminary results of a research carried out in the Medenine area,
Southern Tunisia, aimed at the spectral characterization of salt-affected and sand encroachment
areas, as restrictive factors for agro-pastoral activities. Spectral data was acquired in situ using a
handheld spectroradiometer and samples were taken for X-ray diffractometric analysis. The
sampling sites were chosen on the basis of a morphological analysis, ancillary data and a land
cover/land use map specifically generated for this study employing Landsat 8 imagery. The study
area (400 000 hectares) has been validated with 400 ground truth points. The spectral campaign
has enabled the acquisition of spectral reflectance measurements of 34 points, of which 14 points
for saline surfaces (9 samples); 10 points for sand encroachment areas (10 samples); 3 points for
typical vegetation (halophyte and psammophyte) and 7 points for mixed surfaces. The acquired spectral signatures were processed to be integrated into the web platform SPECCHIO for
comparison with measurements acquired in similar environments. Diffractometric analyses were
completed for the saline samples and allowed the identification of the main mineralogical
components. This study proposes a methodology based on the integrated spectral data acquired
through proximal and remote sensing aimed at monitoring of land degradation phenomena. The
study is part of the WADIS-MAR, a demonstration project funded by the European Commission
through the Sustainable Water Integrated Management (SWIM) Programme
(http://www.wadismar.eu)
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
DEEP-SEATED GRAVITATIONAL SLOPE DEFORMATION: INSIGHTS INTO THE GEOMORPHOLOGICAL AND KINEMATIC EVOLUTION. (EASTERN CENTRAL SARDINIA - WESTERN MEDITERRANEAN SEA).
Full text linkThe PhD research project concerned to the study of Deep-Seated Gravitational Slope Deformations (DSGSDs) in Sardinia. The aim is to identify the areas affected by these processes and understand their geo-structural features and their evolution. These gravitational processes related to the geodynamic evolution of the western Mediterranean in the Pliocene and Quaternary, and in particular with the Uplift processes. A multiscale approach will be used based on the geo-structural and geomorphological analysis of the slopes affected by DSGSDs processes. On a local scale, the study was based on the geological, geomorphological, structural and geotechnical characterization of the slopes, using also innovative technologies such as drone photogrammetry for high resolution reconstruction of the ground surface. The objectives are to contribute to the knowledge on the DSGSDs obtaining three-dimensional interpretative models related to the geomorphological and geostructural structure on a local scale and to insert them in the complex geodynamic context of the Mediterranean and active tectonics in Sardinia.
In conclusion multi-source and multi-scale monitoring system was build in Ogliastra (Sardinia). Space-borne Interferometric Synthetic Aperture Radar (InSAR) data using ERS and Sentinel-1 satellites identified downslope movement identified as DSGSDs active in the past decades. To better understand the kinematics and short-term deformation of the unstable slopes, a monitoring system, consisting of GNSS antenna, tiltmeter, and extensometer, have been installed along the DSGSDs near urban areas. A distribution of GNSS measurement points in the unstable area and adjacent stable areas have since 2020 provided periodic measurements of the deformation. With a temporal resolution of 30 seconds, extensometers and tiltmeters have been recording changes in large block inclinations and movements over prominent fractures. Historical InSAR displacement rate and monitoring data support the model of rock slope deformation indicating large scale-toppling and deep landslides. 24/7 monitoring system could become an essential component of a for early-warning system
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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