1,720,968 research outputs found
Il ponte della Badia di Vulci: storia, rilievo, progetto e intervento di restauro strutturale
No full textNel 2012 alcune inondazioni particolarmente intense del fiume Fiora hanno danneggiato il ponte
della Badia nel Parco Archeologico di Vulci, che si trova tra Canino e Montalto di Castro. L’alluvione
ha danneggiato la struttura del fiume, portando via porzioni di muro alla base del pilone destro, e
trascinandole a valle. Le sezioni superstiti del pilone ora sono più piccole e le connessioni a muro
sono state fortemente influenzate. In particolare, la violenza dell’inondazione ha “strappato” lo
strato protettivo esterno, rendendo il pilone più vulnerabile a un ulteriore deterioramento.
Il ponte, che è noto come “Ponte dell’Arcobaleno”, insieme alla stretta gola scavata dal fiume e al
castello dell’abbazia, formano una splendida vista panoramica che è stata disegnata da pittori e
descritta da viaggiatori come George Dennis e David Herbert Lawrence.
Attraversa il Fiume Fiora in un punto in cui gli argini sono molto vicini tra loro, ma sebbene
questa caratteristica abbia permesso la sua costruzione in epoca etrusca, durante le inondazioni
il ponte restringe l’alveo laddove la corrente accelera fortemente. Ciò crea una criticità aggravata
dall’ulteriore ostacolo di enormi massi, caduti dalle sponde ripide nel letto del fiume.
Nella prospettiva di un restauro, il ponte è stato meticolosamente esaminato per determinarne
le caratteristiche costruttive e i materiali utilizzati. Questo studio ha incluso anche la storia della
struttura, dai tempi più remoti a periodi relativamente recenti, quando ha subito un notevole
restauro.
Come detto, il pilone destro è la parte del ponte più danneggiata dall’alluvione. Fortunatamente
la forma della sponda del fiume in quel punto rende facile la costruzione di strutture temporanee
per il restauro, che per ragioni di sicurezza dovrebbe essere completato in un brevissimo lasso di
tempo, durante il periodo in cui le alluvioni sono statisticamente meno ricorrenti.
Per questi motivi e anche per i limitati fondi messi a disposizione dalla Soprintendenza dell’Etruria
Meridionale, nella prima fase, il restauro si è concentrato sulla reintegrazione del pilone destro
A multiscale geomatic approach for the survey of historic centres main streets: the case study of Capitignano, Italy
Full text linkThe aim of this research is the identification of geomatics techniques and methods capable of representing historic centres in a rapid, detailed and accurate manner. Indeed, historic centres are a cultural heritage asset to be preserved, protected and conserved for future generations, taking into account the history of a community. The paper describes a geomatics methodology applied to the case study of Capitignano (Italy), one of the municipalities that was affected by the 2009 earthquake that involved numerous historic centres causing extensive damage, not only in terms of human lives but also to the cultural heritage. The integration of geomatics techniques made it possible to obtain a georeferenced point cloud that is particularly useful for the description of buildings in historic centres, both at the urban scale and at the scale of individual artefacts. In addition, it was also possible to produce orthophotos with a high geometric resolution that made it possible to identify lesions in structures quickly and accurately
A new fast and low-cost photogrammetry method for the engineering characterization of rock slopes
No full textDigital photogrammetry (DP) represents one of the most used survey techniques in engineering geology. The availability of new high-resolution digital cameras and photogrammetry software has led to a step-change increase in the quality of engineering and structural geological data that can be collected. In particular, the introduction of the structure from motion methodology has led to a significant increase in the routine uses of photogrammetry in geological and engineering geological practice, making this method of survey easier and more attractive. Using structure from motion methods, the creation of photogrammetric 3D models is now easier and faster, however the use of ground control points to scale/geo-reference the models are still required. This often leads to the necessity of using total stations or Global Positioning System (GPS) for the acquisition of ground control points. Although the integrated use of digital photogrammetry and total station/GPS is now common practice, it is clear that this may not always be practical or economically convenient due to the increase in cost of the survey. To address these issues, this research proposes a new method of utilizing photogrammetry for the creation of georeferenced and scaled 3D models not requiring the use of total stations and GPS. The method is based on the use of an object of known geometry located on the outcrop during the survey. Targets located on such objects are used as ground control points and their coordinates are calculated using a simple geological compass and trigonometric formula or CAD 3D software. We present three different levels of survey using (i) a calibrated digital camera, (ii) a non-calibrated digital camera and (iii) two commercial smartphones. The data obtained using the proposed approach and the three levels of survey methods have been validated against a laser scanning (LS) point cloud. Through this validation we highlight the advantages and limitations of the proposed method, suggesting potential applications in engineering geology
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
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
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