1,720,981 research outputs found
Comparison of GPR and Capacitance Probe laboratory experiments in sandy soils
No full textThe integration of different techniques for the estimation of the volumetric water content θ in low-loss sandy soils may allow to obtain more reliable measure, after a proper evaluation of the techniques limits and their pros and cons. In particular, the integration of direct laboratory measurements performed on samples θ values measured) with geophysical data collected on a soil column using a Ground Penetrating Radar (GPR) as well as a Capacitance Probe (CP), allowed us to compare the results and evaluate their accuracy. Our experimental measures, performed on two typical sandy soil outcropping in Central Italy, show that the GPR reflected pulses provide similar permittivity (εr) values for both soils at very low θ. The measured εr values seem to progressively differ by increasing the soil moisture of the two sands. The CP shows a clear difference of measured permittivity already at lower soil moisture. As θ values in the media increase approaching the soil saturation, the CP εr values measured on both the two soils show a larger difference. In conclusion, the comparison between GPR and CP measures in two selected sands under controlled condition (0.05 <0.3)(0.05 <0.3) , shows that the latter tends to overestimate εr on the entire range investigated. Nevertheless, if a specific laboratory calibration is carried out, as in the present work, reliable θ values estimations can be obtained by both methods. Other measurement techniques will be tested and compared in further experiments; moreover, the calibration and integration of GPR and CP is advised not only in laboratory studies, but also to better constrain possible field applications
Turismo, dimore rurali e paesaggio geomorfologico della Sardegna: le regioni degli stazzi e delle corti campidanesi a confronto
No full textLa Sardegna presenta da sempre una forte vocazione turistica, specialmente nelle aree costiere. Il turismo balneare in Sardegna rappresenta un’ importante attività economica nella sua duplice veste di fenomeno sia di massa, sia elitario. Il successo di questo turismo, ormai consolidato, risiede principalmente nelle eccezionalità e spettacolarità dei paesaggi costieri, che rispecchiano la grande varietà litologica e geomorfologica dell’Isola. Al contrario le regioni interne, anche se estremamente interessanti e, a volte, anche più singolari, non hanno lo stesso richiamo turistico e sembrano non poter competere con le tradizionali zone turistiche isolane. La nuova domanda, alla ricerca di una fruizione dei paesaggi che sia alternativa a quella esclusivamente balneare e arricchita di contenuti culturali, oltre che diversamente distribuita nel corso dell’anno, ha stimolato anche l’offerta degli spazi interni e rurali dell’Isola, rimasti per troppo tempo lontano dalle attenzioni dei visitatori. Gli esempi di questo coinvolgimento hanno portato alcune regioni della Sardegna, come la Gallura e il Campidano, a riproporre i propri paesaggi rurali valorizzando in modo particolare il loro patrimonio architettonico e culturale, dove le dimore tradizionali, legate all’agricoltura e alla pastorizia, come stazzi e corti campidanesi ritrovano il loro antico splendore per essere fruiti dal turismo. Si vuole qui proporre, da una parte l’analisi dei caratteri storico-geografici dell’insediamento rurale delle due su citate regioni e il loro contesto geomorfologico, dall’altra la verifica di come la ricchezza geografica e culturale dei paesaggi interni possa stimolare nuove occasioni di fruizione turistica e di sviluppo per le comunità locali.Sardinia is mainly known for its high tourist vocation, particularly, in its coastal sector. The success of its consolidated tourist call lies firstly in the peculiarity and spectacularity of its coastal landscape.
Nevertheless, the inland areas and landscapes, even if extremely interesting from a scientific point of view and sometimes even more spectacular, cannot yet be considered as a real tourist call and cannot compete to the main tourist flux, traditionally located along the coast.
The aim of a tourist fruition of the region alternative to the traditional one and the research of a cultural enrichment, stimulated the tourist offer also of the inland and rural landscapes of the island.
Some examples of this trend are carried out in some Sardinian areas like Gallura (north-eastern Sardinia) and Campidano (south-western Sardinia): here projects of improvement of rural and inland landscapes are proposed, mainly through the offer and improvement of the rich cultural and architectonic heritage, highly represented by the traditional rural homes, like the stazzi and corti, brought back to their original beauty.
With this work we want to describe the great richness of these two areas, both from a geographical and geomorphological point of view and from the historical characters of the rural culture and settlement. The great geographical and cultural heritage of inland areas can be an important chance in tourist fruition and for new planning and management strategies directly involving local communities
The Mt. Pollino Fault (southern Apennines, Italy): GPR signature of Holocenic earthquakes in a “silent” area.
No full textThe Mt. Pollino Fault Zone is located in the northern sector of the Calabria region (southern Italy). It represents a segment between the southernmost part of the Apennines and the Calabrian Arc. In the Pollino area, seismic events of magnitude > 5 are not currently reported in literature and within the seismic catalogues, therefore this ―gap‖ zone has been defined ―silent‖. Due to the geomorphological, geological and paleoseismological evidences of Quaternary faulting, the Pollino-Castrovillari faults are considered active, as demonstrated also by some recent reactivations, that have generated several earthquakes of moderate magnitude (Mmax ≤ 5.0) in a north-western sector, near Mormanno (Mercure Basin) and Morano villages (Morano-Castrovillari Basin). Therefore, the studied area retains many uncertainties in the definition of the seismic hazard. With these premises an integrated project started in 2012 (Agreement INGV-DPC 2012-2013, Project S1) aims to improve the base-knowledge for assessing the seismogenic potential. Among the different geological studies, the project encompasses the GPR fault imaging on several sites, having different goals: 1) define the location and the geologic characteristics of active faults; 2) detect new evidences of ―recent‖ faulting; 3) correctly locate these structural elements on a geologic map; 4) support further paleoseismological surveys. A first 2DGPR survey was done at the Grotta Carbone site, about 4 kilometers from Castrovillari, for which some trench logs were already available, in order to “image” the fault zone and to provide a GPR data calibration using the stratigraphic information. The results of the radargrams interpretation show a characteristic GPR signature of the tectonic structures and faulted units and a different dielectric behavior among the units located across the fault, revealing an excellent matching with the available geological data. Clear tectonic features and their vertical offset between layers have been highlighted within the fault zone. The stratigraphy of the trenches have been extended, along the fault and in depth, providing new useful information essential for a better definition of the seismic hazard of the area and for a future 2D/3D dataset extension across other sites
La stratificazione culturale del sito del Castello Aragonese di Taranto nella ricostruzione del paesaggio
No full text
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
- …
