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Contributo alla conoscenza dell'idrogeologia del gruppo del M. Verzegnis (Prealpi Carniche Orientali)
No full textThe study concerns the hydrogeology of the Verzegnis group Mt. (Western Carnian Prealps). To define the hydrogeological characteristics of the lithology and the water drainage conditions, geological surveys were conduct also in caves. In the studied area 26 springs were identified. The most important of which were investigated for a two years period (2003 – 2004). Water temperature, water conductivity and discharge measures were monthly performed. To determine hydrochemical characteristics, δ18O and radon concentration, water samples were monthly collected. δ18O values were measured also on precipitations collected during the monitored period in three collection sites. The data obtained permitted to have a preliminary characterization of drainage networks relative to the most important springs fed by Verzegnis Mt. hydrostructure
Trasmissione di impulsi di piena nella zona sorgentifera del Carso Triestino.
No full textIn the framework of a study aimed at the aquifer system characterization in the Sistiana quarry area (Gulf of Trieste,
Classical Karst coast line), resulted that geochemical characteristics of these waters are similar to the one of karsticAurisina
Spring. ! ese springs are located at about 3.5 km SE from the quarry. Sistiana waters are mixed waters due to two contributions:
the neoin" ltration waters and the one coming from a shallow circuit. Water table # uctuations are consistent with the ones
typical of the Karst system and its water level result heavily modi" ed during low water regime by the gate handling regulating
the out# ows at Timavo Springs in San Giovanni di Duino
POTENTIAL IMPACT OF A PROPOSED RAILWAY TUNNEL ON THE KARST ENVIRONMENT: THE EXAMPLE OF ROSANDRA VALLEY, CLASSICAL KARST REGION, ITALY-SLOVENIA
Full text linkVal Rosandra is a unique geomorphological environment located on the western side of the Classical Karst Plateau (NE Italy). This deep limestone gorge is crossed by a stream that is fed by a large basin located in Slovenia. Val Rosandra is the only example of a karst river valley withsurface hydrography in the Classical Karst Plateau. The torrent that crosses it digs a deep gully into the rock, richin rapids, swirl holes, small waterfalls, enclosed meanders and basins; here, the first seepage phenomena occur, and part of the water feeds the underground aquifer.Val Rosandra is characterised by a complex structural situation. The NE slope culminates in the structure of Mt. Stena, a limestone tectonic wedge between two faults, firmly rooted in the karst platform. Bothits external morphology and its caves are influenced by the structure, i.e. by the attitude of bedding planes, fault planes and master joints. Mt. Stena, in particular, hosts a comprehensive net of articulated and diversely shaped caves, basically organised on several levels. This network stretches over a total of 9,000 metres, bearing testimony to ancient geological and hydrogeological origins.The deepest areas of the system reacha suspended aquifer that is probably sustained by an overthrust and placed about 100 meters above the underground aquifer of the Rosandra torrent.A series of feasibility studies on the Trieste-Divača high-speed railway link concentrated on the potential interaction between the project and karst features. In line withthe project requirements, risk of voids intersection and water contamination were analyzed as Mt. Stena’s suspended aquifer partially feeds the Rosandra torrent, whichflows in a protected natural area. We therefore suggest that further investigations ought to be performed to integrate the existing knowledge on karst and on the hydrogeological aspects of the massif
The karst hydrostructure of the Verzegnis group (NE Italy)
No full textIn a quickly changing environment where drinking water appears ever more scarce and polluted, it is vitally important to study the quantity and quality of the available resources. With this in mind, the Verzegnis mountain group (Western Carnian Prealps, NE Italy) represents an important karst aquifer system upon which to draw water to supply inhabitants and industrial activities.
The aim of this study is to highlight the state of the art of the resources present in the hydrostructure, understanding the recharge areas and characterizing the flow dynamics with a view to a sustainable exploitation. To complete this study, classical field surveys were conducted during which the main geochemical characteristics were analyzed.
Measurements of water temperature (T), Electrical Conductivity (EC), Total Dissolved Solid (TDS), groundwater discharge (Q) and precipitation amount were performed monthly for a period of two years. The geochemical characteristics were defined using water sample analyses of
the major ions and d18O values. The analyses performed and the resulting hydrogeological map allowed for a preliminary characterization of the hydrogeological behavior of the entire hydrostructure where the presence of tectonic structures and different lithological units represent a physical threshold for the waters. In fact, the groundwaters are mainly contained between the tectonic structure Douf—Auda thrust in the E, NE and a permeability threshold on the W created by the presence of the Dolomia di Forni Formation. In the southern side of the massif, a transcurrent fault creates a water divide between Mt. Verzegnis and Mt. Piombada
Environmental effects on the bright end of the galaxy luminosity function in galaxy clusters
No full textContext. The dependence of the luminosity function (LF) of cluster galaxies on the evolutionary state of the parent cluster is still an open question, in particular concerning the formation/evolution of the brightest cluster galaxies.
Aims: We study the bright part of the LFs of a sample of very unrelaxed clusters ("DARC" clusters showing evidence of major, recent mergers) and compare them to a reference sample of relaxed clusters that span a comparable mass and redshift range.
Methods: Our analysis is based on the SDSS DR7 photometric data of ten massive and X-ray luminous clusters (0.2 ≲ z ≲ 0.3), always considering physical radii (R200 or its fractions). We considered r' band LFs and used the color-magnitude diagrams (r' - i', r') to clean our samples to consider red and blue galaxies separately.
Results: We find that DARC and relaxed clusters give similar LF parameters and blue fractions. The two samples differ in their content of bright galaxies BGs, Mr' < -22.5. Relaxed clusters have fewer BGs, in particular when considering the outer cluster region 0.5R200 < R < R200 (by a factor two). However, the cumulative light in BGs is similar for relaxed and DARC samples.
Conclusions: We conclude that BGs grow in luminosity and decrease in number as the parent clusters grow hierarchically, which agrees with a BG formation by merging with other luminous galaxies
Interaction between karst and porous aquifers, the case of Mt. Mia transboundary aquifer.
No full textThe Mount Mia massif is located in the eastern side of the Friuli Venezia Giulia Region, across the border between Italy and Slovenia. It is an important karst hydrostructure bounded in the N, E and S by the Natisone River (Figure 1). Several springs are emerging at the toe of the massif mainly in the south-eastern side along the river. The two main springs, Poiana and Tologu, are tapped for the Cividale town water supply. The aim of the present paper is to assess the spring recharge area, its potentialities and vulnerabilities in order to quantify a possible increase withdrawal for the water supply
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
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