1,720,985 research outputs found
INTEGRATING LIDAR INTENSITY MEASURES AND HYPERSPECTRAL DATA FOR AUTHOMATIC EXTRACTION OF CULTURAL HERITAGE
No full textAnalisi di dati laser scanner terrestre per la valutazione del rischio potenziale da instabilità di una parete rocciosa sulla Costa di Serravalle (Vittorio Veneto, TV)
No full textSi presentano i risultati del rilievo laser a scansione di una parete rocciosa ubicata nel Comune di Vittorio Veneto (Treviso). Si tratta di un versante in roccia estremamente acclive interessato da fenomeni di dissesto, appartenete alla serie di hogback subalpini che caratterizzano il passaggio al margine prealpino nel territorio provinciale trevigiano. Lo studio prevede la sperimentazione di tecniche di rilievo a distanza delle condizioni della parete rocciosa per la classificazione morfologica e la definizione dei settori a rischio potenziale di crollo superficiale. Viene illustrata la strumentazione utilizzata, i metodi di rilievo e di analisi dei risultati. Il rilievo laserscan è stato integrato da un’indagine termografica. Le diverse informazioni dei dati elaborati dal modello della superficie e - laddove necessario - corretti dalla foto terrestre georiferita sono stati sintetizzati per ottenere la mappa da rischio instabilità di versante. I dati sono stati elaborati attraverso un algoritmo multicriteria evaluation (MCE) che ha permesso di pesare le variabili a disposizione e di sintetizzarle in una mappa finale che indica il diverso grado di rischio di distacco
Vertical Profiles of Airborne PM in Po Valley During Wheat Harvest Activities
Full text linkPo Valley and Friuli Plain in Italy and Belgian Plain in Europe, are areas with the highest concentration of solid particulate matter in all the world (European Space Agency, 2004). This implies that those areas does not respect the limits imposed by European Parliament in 2008. Aim of this study is the characterization of the particulate matter, through direct sampling in atmosphere to define physical properties and source of this particulate. A first campaign has been carried out in June-July 2009 in the Po Valley during farming activities of threshing, by means of a small aircraft (Cessna172P), that has been used as platform for collecting measure particles. Particle concentration has been measured for five aerodynamic equivalent diameters (0.5, 1.0, 2.5, 5.0, 10.0µm) using a laser counter (LIGHTHOUSE HH3016). The acquisition has been carried out vertically profiling the atmosphere from 150 to 2400m. SEM, as well as SEM-EDS analysis on single particles, have been carried out with the aim to obtain detailed dimensional and morphological information to define origin, toxicity and the nature of organic matter (Germani & Buseck, 1991; Grassi, Narducci, & Tognotti, 2004)
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 and comparison of solid particulate matter between Po Valley and Friuli Plain
No full text
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
Innovative integrated airborne and wireless systems for landslide monitoring
No full textLandslides are a widespread phenomenon over the Italian territory and economical losses due to this hazard are impressive (an average of 2 billion of euros per year in the last 50 years). In the framework of the WISELAND research project (Integrated Airborne and Wireless Sensor Network systems for Landslide Monitoring) funded by the Italian Government, we are testing new monitoring devices devoted to control large landslides at different degrees of activity. Integrated monitoring tools with a strong innovative character are being explored, in particular ground-based wireless sensor networks combined with airborne laser-scanning and hyperspectral surveys.A wireless sensor network (WSN) consists of a set of low cost micro-computers capable to measure physical parameters and to communicate between them. Such a technique allows landslides remote monitoring, measuring spatially distributed parameters and recognizing deformation patterns. Ground-based sensor networks can be effectively integrated with grid-based data measured by the use of airborne techniques. The Light Detection and Ranging (Lidar) technology is used primarily to densely map wide areas, even in presence of a thick vegetation coverage, to retrieve high resolution Digital Terrain Models (DTMs); DTMs are fundamental in monitoring and describing landslide movements. Hyperspectral sensors are capable to measure parameters such as soil moisture content, vegetation coverage and surface roughness, that can be correlated with slope movements.In the first year of the project we tested and validated these monitoring tools on two large earthflows, which are representative of the widespread slope instability in the Northern Apennine: the Silla landslide (Bologna Province, Italy) and the Valoria landslide (Modena Province, Italy). Although characterised by different geological settings and evolution stages, both landslides are associated to a high degree of risk because of the presence of vulnerable elements and their tendency to periodic and abrupt reactivations.Periodic airborne surveys were performed in Valoria site in different periods, in order to monitor the surface displacement of the slopes. Multitemporal Lidar DTMs allowed the calculation of a differential surface, therefore highlighting absolute height variations and recognizing the main landslide components. Hyperspectral data helped in the landslide characterization; for instance the analysis of PCA components are also correlated with results coming from DTM analysis and this has been evidenced to be a proper system to identify depletion and accumulation zones.A prototype wireless sensor network was installed at Silla landslide in July 2009. The network consists of four nodes (located in the upper part of the landslide) configured with static routing table which forward packets (one data every 15 minutes) to a master node connected to a laptop. Parallel to this test, a new node hardware platform, more shaped for low power – high range data transmission in outdoor conditions has been developed and it is now ready to be deployed in the field
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