1,721,088 research outputs found
Seismic and non‐invasive geophysical surveys for the renovation project of Branciforte Palace in Palermo
Full text linkThe renovation project of the historic Branciforte Palace (16th–17th century) in Palermo (Italy) was owned by the Banco di Sicilia Foundation, with the aim for it to become a multi-purpose centre for the promotion of exhibitions and cultural events. In the context of the restoration work, a multi-methodological and non-invasive geophysical
study has been carried out. The seismic characterization of the foundation soils was obtained by means of joint interpretations of a vertical seismic profile (VSP), multichannel analysis of surface waves (MASW) and horizontal to vertical spectral ratio (HVSR) microtremor analysis. The mutually constrained inversion of seismic surveys carried out with different techniques made it possible to obtain a robust interpretation of the foundation soils. Moreover, indoor geophysical surveys have been carried out to identify critical issues in the state of conservation of the floors and wall structures. In particular ground penetrating radar (GPR) profiles and an electrical resistivity tomography (ERT) have been carried out on the floor of the stable of the Palace, to evaluate in detail the state of consolidation of the foundation soil, in correspondence of a double row of marble columns, some of which were affected by differential subsidence. The joint interpretation allowed to generate a threedimensional (3D) model of the foundation's subsoil, highlighting the irregular surface of the foundation rock and to identify the main structural voids responsible for subsidence. Furthermore, some supporting columns have been investigated by means of ultrasonic tomography (UST) to verify their state of degradation. Finally, infrared thermography (IRT) images of the internal and external walls and of the vaults highlighted differences in the type of masonry and in the state of the plaster
Virtual three-dimensional model of the subsoil of the church of St. Maria Maddalena d'Alga in Palermo, using high-resolution GPR surveys
Full text linkThe church of Santa Maria Maddalena d'Alga is located in the historic center of Palermo and belongs to the monumental complex of the military
district of San Giacomo, in the ancient western fortified area of the city. Today the area hosts a vast military complex, seat of the Command of the
Carabinieri Legion of Sicily. The church is elevated with respect to the current floor. During some maintenance works of the church, for the installation of air conditioners, some georadar surveys were carried out to verify the presence of crypts or tombs under the pavement. The investigations made it possible to reconstruct a 3D georadar model and to identify some anomalies under the pavement. Some of these correspond to rooms that have been opened during maintenance work
Joint interpretation of seismic refraction tomography and electrical resistivity tomography by cluster analysis to detect buried cavities
Full text linkIn the last few years, the geophysical methods of seismic refraction tomography (SRT) and electrical resistivity tomography (ERT) are among themost used geophysical techniques for the reconstruction of subsoil geometries, for the investigation of underground cavities and also for the archaeological prospecting. However, the main disadvantage of each geophysical method is the difficulty of final interpretation of the data. In order to eliminate artifacts
and generally improve the reliability and accuracy of geophysical interpretation, it is useful to perform a joint approach of different geophysical methods, also introducing the a priori information. In this work, it is shown the integrated study of seismic refraction tomography and electrical resistivity tomography techniques, the two geophysical methods are tested on both synthetic and real data and the integration of data is useful in detecting buried cavities and also evaluate their geometric characteristics. Likelihood parameters has been defined and tested, in order to help recognizing voids from other lithological structures. Finally, a statistical approach based on cluster analysis of the P-wave velocity, the density of the seismic rays and the electrical
resistivity of the synthetic and experimental models was used. Multi-space cluster distribution maps were built, allowing to better define and interpret the anomalies of the subsoil
Individuazione di cavità attraverso tomografie elettriche e sismiche
No full textLe tecniche geofisiche sono i metodi più efficienti per ottenere informazioni sulle strutture presenti nel sottosuolo. Ad oggi,
la tomografia di resistività elettrica (ERT) è il metodo più utilizzato per il rilevamento di vuoti sotterranei, tuttavia, la combinazione
con dati derivanti da diversi metodi geofisici è l’approccio più adatto per la determinazione delle cavità. Negli ultimi
anni, la ERT è stata sempre più spesso congiunta alla tomografia sismica a rifrazione (SRT) al fine di ottenere interpretazioni
più robuste anche utilizzando un approccio di tipo statistico. La cluster analysis eseguita su unità statistiche definite
da valori di resistività elettrica, velocità delle onde P e densità sismica, ha permesso di ottenere interpretazioni ottimali
delle strutture del sottosuolo. In base al numero di cluster, le mappe di distribuzione sono state costruite in uno spazio
multiparametrico, consentendo di definire determinati limiti di variabilità per i parametri selezionati.Geophysical techniques are the most efficient methods for obtaining information on the structures present in the subsoil.
Today electrical resistivity tomography (ERT) is the most used method for the detection of underground voids, however, the
combination of experimental data from different geophysical methods is the most suitable approach for the determination of
cavities. In recent years, the ERT has been joined more and more often to the technique of seismic refraction tomography
(SRT) in order to obtain more robust interpretations also using a clustering approach. The cluster analysis performed on
static units defined by electrical resistivity values, P wave velocities, and seismic density on coincident sections, allowed
to interpret the subsoil structures. Based on the number of clusters, cluster distribution maps have been constructed in the
multi-parameter space, allowing to define certain variability limits for the selected parameters
GPR and ERT surveys in the Giardino dell’Annunziata in Cammarata (Sicily)
Full text linkA recovery project has recently involved a garden sited in Cammarata (Southern Sicily), known as "Giardino dell'Annunziata" adjacent to the church
of the same name (Chiesa dell'Annunziata). In this area, according to the scarce historical sources, there was a Benedictine convent, probably demolished in the eighteenth century. As a diagnostical support some geophysical surveys were carried out in the garden. A 3D geoelectric survey and 36 Ground Penetrating Radar (GPR) profiles were carried out which made it possible to reconstruct the corresponding 3D models of the subsoil. A large resistive anomaly has been detected, which has no match in the 3D GPR model showing only minor surface anomalies. The anomalous area can be due to an original flow route of the river, but it cannot be excluded that it is caused by an artificial channel or even underground environments, subsequently filled with landfill material. Archaeological excavations are planned to better clarify the nature of the anomaly
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
- …
