1,720,976 research outputs found
Pollution levels in the industrial area of Potenza (Southern Italy)
No full textA monitoring procedure based on soil magnetic susceptibility measurements seems to be an interesting method to evaluate in real time the presence and distribution of soil pollutants on large areas in a not-invasive and not-expensive way. In this paper, we present the results of an in situ field survey aimed to evaluate level and distribution of pollutants in an industrial area by means of magnetic susceptibility measurements used as proxy variable. We carried out the field survey in the industrial area of Potenza, characterized by the presence of industrial settlements, many commercial activities and a high traffic volume in all the area. Results show that soil magnetic susceptibility measurements are a good indicator of the anthropogenic impact, mainly from urban busses pollution and iron industry smelting. In relation to this type of contamination, magnetic susceptibility may be used as a useful tool for the first screening of polluted zones
2D and 3D high resolution geoelectrical tomography for non-destructive determination of the spatial variability of plant root distribution: laboratory experiments and field measurements
No full textThree-dimensional ground penetrating radar surveys at Grotte dell’Angelo, Pertosa, (SA), Southern Italy
No full textGround Penetrating Radar (GPR) is a well assessed electromagnetic tool for subsurface imaging and is widely adopted in several Earth Sciences, such as geophysics, geology and archeology, in order to gather information on buried structures in non-invasive way and without performing excavations.
In this communication, we report on the GPR measurement campaign carried out at Grotte dell’Angelo, Pertosa, (SA), Southern Italy, one of the most famous sites of the Cilento and Vallo di Diano geopark. This site, beyond to be a striking nature trail, is of archeological interest since a prehistoric pile dwelling settlement was discovered in the cavern at the end of the nineteenth century. Unfortunately, large part of this ruins was destroyed and the surviving ones are not visible being covered by an embankment and the river crossing the cave. In this frame, GPR survey have been recently carried out with a two- fold aim: to support the outcomes of previous archaeological investigations and to infer about the presence of pile‐dwelling structures in a not previously investigated area
Magnetic and ground penetrating radar for the research of Medieval buried structures in Marche Region
Full text linkA magnetic and Ground Penetrating Radar joint survey was carried out in the
framework of the R.I.M.E.M. project that has the aim of supporting the
archaeological prospections and drive the selection of the excavation areas
related to the Late Roman Period and Early Middle Ages in the Central and
Southern Italy. In particular, this papers deals with the magnetic surveys
acquired near "Madonna della Valle" and GPR and magnetic joint surveys
carried out in "Monastero"site. Most of magnetic maps carried out in
"Madonna della Valle" site shown the absence of structured magnetic
anomalies, despite of the presence of archaeological signs. Several
hypothesis were given to explain this evidence.
Joint interpretation performed in "Monastero" site shown more intense
magnetic anomalies related with shallower reflections due to probably to
buried pipes. Other reflections are related with magnetic anomalies
compatible with archaeological targets, but some significant reflections do
not correspond to any magnetic anomaly, indicating magnetic method could be
"blind" respect the archaeological target.
New field surveys including the electrical resistivity tomography could be
carried out in order to overcome these acquisition and interpretation
difficulties
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
Chemical and electromagnetic parameters for studying erosion processes: “Calanchi” of Aliano (Southern Italy)
No full textVariations 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
Uso della tomografia geoelettrica per lo studio della variabilità spaziale delle proprietà fisiche del terreno e degli apparati radicali in sistema pescheto. Indagine preliminare
No full textWorldwide interest in reducing greenhouse gases has led to apply the more accurate,
less invasive imaging methods of geophysics for quantifying the root biomass and
evaluating their critical role in space and time. The general aim of this work is to apply
the combined application of geoelectrical imaging techniques (non-destructive) and
conventional soil methods (destructive) on representative soil samples to study the spatial
distribution of orchard tree roots and their relation to physical soil properties in tilled
soil. This combined application aims at investigating roots, characterising them
from other subsurface heterogeneities and studying (empirical) relationships between
electrical resistivity, pedo-hydrological properties (e.g., texture, stone content, water
content and quality) and root parameters (e.g., woody and fine root length, root density).
This serve identify all sources of variability encountered in the experiment in an
effort to improve the applicability of electrical resistivity techniques in this field. Using
2-D electrical tomography a set of field geoelectrical measurements were carried out at
the study site for studying the spatial variability of soil root zone under varying conditions
of soil management, stone content, clay content and moisture content. Resulting
2D and 3D resistivity Ú models can image root zones and hydro pedological horizons
and heterogeneities. The Ú models are correlated with soil and root multiparameters
measured directly on a sequence of core samples collected from trenches excavated
below electrical profiles post to the survey. Results reflect a complex spatial variability
of these parameters. The effects on the resistivity of the measured soil system parameters
were investigated through multiregressive statistical analysis using backward
method with confidence intervals of 95%. Resistivity shows significant relationships
with stone content, woody root length and total root biomass density, soil salinity (measured
by electrical conductivity) and particularly water content
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