1,721,010 research outputs found
From the integrated survey of architecture and territory to its representation. The contribution of radar antenna in data acquisition
Full text link'introduzione di banche dati ad accesso libero riguardanti il Territorio ha posto l'accento sul tema dell'organizzazione, in una visione sistemica, dei rilevamenti a diverse scale dimensionali. È pratica comune integrare dati come le fotografie satellitari e i DEM (Digital Elevation Model) con gli altri dati ottenuti da scansioni laser terrestri, fotogrammetria, topografia e così via. Nel panorama del SSD ICAR/17, lo studio delle applicazioni delle radiazioni ottiche è un dato acquisito, ma assai
più rara è la trattazione sull'uso delle onde radio. Nel corso degli ultimi anni si sono diffusi i radar (Radio Detection And Ranging) per la generazione d'immagini, sensori attivi basati sulla registrazione degli impulsi di energia a microonde da loro emessi e poi riflessi dai corpi nel loro campo d'azione. Ai fini del rilievo integrato, le peculiarità preminenti della produzione d'immagini tramite radar sono: A) la coerenza della radiazione radar a microonde, poiché queste ultime sono emesse in
fase, per poi registrare il loro sfasamento durante la ricezione; B) le differenti interazioni tra il bersaglio e il fascio radar che lo scandisce, a seconda della banda di frequenza di microonde adoperata e della polarizzazione; C) la possibilità di usare questi sensori anche in totale assenza di luce e nella maggior parte delle condizioni atmosferiche; D) l'esecuzione di elaborazioni via via più complesse, partendo dalle immagini bidimensionali ottenute dalle scansioni, per arrivare a ricavare
DEM o persino nuvole di punti. In questa ricerca: 1) analizziamo criticamente dei metodi di registrazione ed elaborazione di immagini radar utili al rilievo integrato territoriale e dell'Architettura; 2) impieghiamo alcuni di questi metodi in due casi di studio concernenti l'architettura storica militare, allo scopo di verificarne l'efficacia e la precisione; 3) studiamo apparati di rappresentazione idonei alla restituzione dei dati radar.The introduction of open-access data repositories about Territory has highlighted the issue of organising surveys at different dimensional scales in a systemic view. It is common practice to integrate data such as satellite photographs and DEMs (Digital Elevation Models) with other data obtained from terrestrial laser scanning, photogrammetry, topography and so on. In the Italian Scientific Disciplinary Area for Civil Engineering and Architecture SSD ICAR/17, the study of applications of optical radiation is an established fact, but much rarer is the discussion about the use of radio waves. In recent years, imaging radars (Radio Detection And Ranging), active sensors based on the recording of microwave energy pulses emitted by them and then reflected by bodies in their field of action, have become widespread. In relation to the purposes of integrated surveying, the overriding peculiarities of radar imaging are: A) the coherence of radar radiation, since microwaves are emitted in phase and then their phase shift is registered during reception; B) the different interactions between the target and the radar beam that scans it, depending on the microwave frequency band used and polarisation; C) the possibility of using these sensors even in total absence of light and in most atmospheric conditions; D) the execution of progressively more complex processing, starting from the two-dimensional images derived from the scans, to obtain DEMs or even point clouds. In this research: 1) we critically analyse methods for recording and processing radar images useful for integrated surveying of Territory and Architecture; 2) we employ some of these methods in two case studies concerning historical military architecture, in order to verify their effectiveness and precision; 3) we study representation apparatuses suitable for the restitution of radar data
Paleobathymetric and depositional evolution inferred by micropaleontological data: the case of the Oligo-Miocene Northern Apennine foreland basin (Italy)
No full textGoing 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
An Integrated survey for Cultural Heritage Mapping. The Spanish Fortress (Italy) case-study
No full textRemote sensing is a powerful tool for mapping and monitoring Earth. In this work different imaging techniques based on optical and Synthetic Aperture Radar (SAR) data are integrated, in order to show a multi-source and multi-sensory analysis based on the use of remotely acquired data. In particular spaceborne SAR data, Light Detection And Ranging (LiDAR) and data acquired by in situ surveying techniques with a Terrestrial Laser Scanner (TLS) are integrated, in a process aimed at the mapping of cultural heritage asset. Experimental results concerning a test site located in Italy are shown
A Multidisciplinary Tool for the Development of a Regional-scale Geotechnical Model: A Case Study in the North-Western Adriatic Coastal Area
No full textAbstractThe paper describes the geotechnical model of a coastal flat area facing the Adriatic Sea, between the municipalities of Cesenatico and Bellaria-Igea Marina (Emilia-Romagna region, Italy). On the basis of a large experimental database provided by the Geological, Seismic and Soil Survey of the Emilia-Romagna Authority, a stratigraphic scheme of the upper 40 m of this coastal plain subsoil has been defined and reliable estimates of parameters for the different soil units have been derived. The accurate mechanical characterization of soils, also reflecting their sedimentological framework, allows the development of a regional-scale geotechnical model providing a reliable and useful support to geotechnical engineers working in this area or similar geological environments
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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