1,721,062 research outputs found
UAV photogrammetry and ground surveys as a mapping tool for quickly monitoring shoreline and beach changes
Full text linkThe aim of this work is to evaluate UAV photogrammetric and GNSS techniques to investigate coastal zone morphological changes due to both natural and anthropogenic factors. Monitoring morphological beach change and coastline evolution trends is necessary to plan ecient maintenance work, sand refill and engineering structures to avoid coastal drift. The test area is located on the Northern Adriatic coast, a few kilometres from Ravenna (Italy). Three multi-temporal UAV surveys were performed using UAVs supported by GCPs, and Post Processed Kinematic (PPK) surveys were carried out to produce three-dimensional models to be used for comparison and validation. The statistical method based on Crossover Error Analysis was used to assess the empirical accuracy of the PPK surveys. GNSS surveys were then adopted to evaluate the accuracy of the 2019 photogrammetric DTMs. A multi-temporal analysis was carried out by gathering LiDAR dataset (2013) provided by the "Ministero dell'Ambiente e della Tutela del Territorio e del Mare" (MATTM), 1:5000 Regional Technical Cartography (CTR, 1998; DBTR 2013), and 1:5000 AGEA orthophotos (2008, 2011). The digitization of shoreline position on multi-temporal orthophotos and maps, together with DTM comparison, permitted historical coastal changes to be highlighted
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
Multi-temporal analysis of the geomorphic evolution of the failure surface of the Vajont landslide
Full text linkLandslides are among the most common type of hazard that affect mountainous regions. While the impact of the single landslide is often localized and limited to the influence area, in some cases, the occurrence of major events can result in significant and long-lasting social, economic, and environmental impacts that extend beyond the area directly affected by the event. These major landslides involve the sudden detachment of large volumes of rock mass and cause significant disturbance of in-situ stress field due to slope debuttressing and reduction in lateral support, which often result in conditions of limit equilibrium affecting the remaining part of the slope. Effects of such limit equilibrium conditions can range from a long term, gradual morphological evolution of the slope due to progressive detachment of material, to the development of multistage landslides, involving the failure of volumes of rock mass similar in magnitude and impacts to the original event. In this work, we investigate the post-failure morphological evolution of the daylighting rupture surface and deposit of one of the most important historical landslides, the 1963 Vajont Slide. A preliminary investigation of a pair of airborne laser scanner (ALS) datasets, collected in 2017 and 2023, is undertaken to assess and compute the change in elevation across selected areas within the rupture surface. Based on a three-dimensional change detection analysis, the observed volumetric changes of selected, inferred rockfall events are estimated. Terrestrial and airborne photographs are also used to identify the unstable volumes that have progressively detached, as well as the damage features that outlined these unstable blocks. Finally, we discuss the long-term evolution of the slope with focus on progressive damage accumulation and its spatial relationship with inherited, tectonic structures. Ultimately, this contribution is intended to highlight the important role of post-slope failure damage accumulation on the long-term stability of rock slopes, emphasizing the critical role that post-failure monitoring and analysis can play in outlining the residual landslide hazard and, in some instances, the potential development of multi-stage landslides
Feronia Park. A short tale
No full textQuesto libro narra di un'esperienza di ricerca-azione organizzata per conto del programma di ricerca LUS-Living Urban Scape da Maria Livia Olivetti, Annalisa Metta e Anna Lambertini, svolta sotto forma di workshop per studenti e abitanti a Roma nel quartiere di Pietralata nei mesi di aprile e maggio 2013. LUS è un progetto di ricerca nazionale che si propone di esplorare proposte e operazioni reali per la rigenerazione degli spazi aperti negli insediamenti di edilizia residenziale pubblica. Finanziato nel 2011 dal Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR) tramite bando FIRB per giovani ricercatori, è condotto da un gruppo interdisciplinare di paesaggisti, urbanisti, architetti e sociologi nelle sedi di Roma Tre e dello IUAV di Venezia. Il libro si articola in due sezioni. Trasformare racconta le due settimane di workshop attraverso riflessioni critiche e narrazioni fotografiche. Fare Luoghi raccoglie le testimonianze su quanto è accaduto, dei progettisti coinvolti nel condurre gli interventi di trasformazione in nuovo spazio pubblico di un tratto di paesaggio urbano prima in gran parte dimenticato
In tempo reale. Know how-Do how
No full textQuesto libro narra di un'esperienza di ricerca-azione organizzata per conto del programma di ricerca LUS-Living Urban Scape da Maria Livia Olivetti, Annalisa Metta e Anna Lambertini, svolta sotto forma di workshop per studenti e abitanti a Roma nel quartiere di Pietralata nei mesi di aprile e maggio 2013. LUS è un progetto di ricerca nazionale che si propone di esplorare proposte e operazioni reali per la rigenerazione degli spazi aperti negli insediamenti di edilizia residenziale pubblica. Finanziato nel 2011 dal Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR) tramite bando FIRB per giovani ricercatori, è condotto da un gruppo interdisciplinare di paesaggisti, urbanisti, architetti e sociologi nelle sedi di Roma Tre e dello IUAV di Venezia. Il libro si articola in due sezioni. Trasformare racconta le due settimane di workshop attraverso riflessioni critiche e narrazioni fotografiche. Fare Luoghi raccoglie le testimonianze su quanto è accaduto, dei progettisti coinvolti nel condurre gli interventi di trasformazione in nuovo spazio pubblico di un tratto di paesaggio urbano prima in gran parte dimenticato. Tra i saggi, il contributo a propria firma "In tempo reale. Know how, do how". Sebbene il processo di progettazione e autocostruzione attivato da PICS appartenga a uno scenario ormai sterminato di esperienze di trasformazione di spazi aperti urbani leggere, rapide e a basso costo, già ampiamente descritto e interpretato, può essere utile, soprattutto in Italia, riflettere sul rapporto tra queste modalità d’intervento e le vie consuete del progetto, nel tentativo di proporne la necessità di una definitiva complementare convergenza. In particolare, ricorrendo alla dimensione temporale del progetto come principale filtro interpretativo, si intende sostenere che le pratiche informali possano essere uno dei possibili strumenti del progetto ordinario, e non necessariamente un’alternativa, e che modi diversi di intendere e praticare il progetto possano affiancarsi con pari dignità e responsabilità, risultandone un armamentario più ricco di arnesi, modelli, materiali e competenze per operare lo spazio pubblico. Parallelamente, si vuol rilevare che occasioni come PICS rafforzino l’evidenza che sempre più spesso sia l’architettura del paesaggio la chiave risolutiva di molte impasse del progetto urbano contemporaneo, proponendosi non solo come ambito di lavoro e come disciplina, ma come vero e proprio metodo, giacché “geneticamente” adusa a confrontarsi con fenomeni evolutivi e instabili, con la fragilità e il rischio come agenti creativi
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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