1,721,116 research outputs found
Analisi delle vibrazioni prodotte da un flusso granulare secco
Full text linkI debris flow sono tra i più pericolosi fenomeni di instabilità di versante, e il loro monitoraggio rappresenta una delle possibili strategie di mitigazione e di prevenzione degli effetti disastrosi che possono provocare. Recentemente è stata proposto di monitorare le vibrazioni prodotte da questi fenomeni con sensori in fibra ottica, in alternativa ai metodi tradizionali. Per approfondire questa tematica, in questo studio un flusso granulare secco all’interno di una canaletta è stato simulato mediante il metodo agli elementi discreti (DEM). Le particelle utilizzate nel modello sono state ottenute mediante una ricostruzione fotogrammetrica di grani reali. L’andamento delle forze normali e tangenziali con riferimento ad una piastra di misura posta sul fondo, è stato registrato allo scopo di riprodurre sinteticamente il segnale sismico generato dal flusso
Ganderberg Landslide Characterization Through Monitoring
No full textA Deep-seated Gravitational Slope Deformation (DGSD) extends over an area of 3.75 km2 in the south-west flank of Mt. Ganderberg, north of Bolzano, Italy. The landslide stretches from an altitude of 2,330 m a.s.l. down to the River Passer at 1,170 m, with an estimated shear surface depth of 100 m. The area is characterized by typical Alpine morphological features and preserves traces of the last glaciation and clear evidences of recent gravitational phenomena. The DGSD induced some collateral mass movements such has rotational and translational slides. Since 2007 the DGSD has been monitored through a network of 20 Global Navigation Satellite System (GNSS) benchmarks. The results showed a different rate of displacement, between the north and the south sectors that allowed to define the kinematics patterns of the landslide, a key point to forecast future scenarios and to support risk managers and public administration in the definition of the countermeasures for risk mitigatio
A web-based platform for automatic and continuous landslide monitoring: The Rotolon (Eastern Italian Alps) case study
No full textIn the Small Dolomites group (Eastern Italian Alps), the Rotolon catchment is affected by a landslide that historically threatened the nearby village of Recoaro Terme. After the last re-activation on November 2010, the need to deploy devices to monitor deformations on the unstable slope became of paramount importance. This paper deals with the methodology, the techniques and the integrated services adopted for the design and the realization of a web-based platform for automatic and continuous monitoring of the Rotolon landslide. The choice of a web environment simplifies data collection, while a remote control permits technical maintenance and calibration on instruments and sensors in the field. Data management is straightforward on a single server, with the dataset being continuously updated. There is a user-friendly web interface which allows a practical up-to-date solution for decision-makers. This web-based monitoring platform represents the first step in the implementation of a complete early warning system
Landslide monitoring with an integrated platform: methodology, design and case study
No full textLandslide monitoring is usually linked to a complex physical system with several parameters and uncertainties. Different instruments are located and set up on field, but a simple, continuous and efficient integration is compulsory for an acceptable warning support. The South-East flank of Mount Carega (Eastern Italian Alps) is affected by a complex landslide that, since 1985, is threatening Recoaro Terme. After the last re-activation on November 2010 (637 mm of intense rainfall recorded in the 12 days prior the event), a mass of approximately 320.000 m3 detached from the flank of Mount Carega and evolved into a fast debris flow that ran for about 4 km along the stream bed. A real-time monitoring system was required to detect early indication of rapid movements, potentially saving lives and property. A web-based platform for automatic and continuous monitoring was designed as a first step in the implementation of an early-warning system. Measurements collected by the automated geotechnical and topographic instrumentation, deployed over the landslide body, are gathered in a central acquisition unit. After the calibration process, data are transmitted by web services on a local server, where graphs, maps, reports and alert announcement are automatically generated and updated. All the processed information is available by web browser with different access right
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
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