1,721,127 research outputs found
Formazione delle identità sociali tra azione assistenziale e rivendicazione dei diritti giurisdizionali: il sistema del dare nella Valcamonica del XVIII secolo
No full textIl saggio indaga, attraverso lo studio delle visite pastorali, i sistemi dell'assistenza nella Valcamonica del XVIII secol
Study of tributary inflows in Lake Iseo with a rotating physical model
No full textThe influence of Coriolis force on the currents of large lakes is well acknowledged; very few contributions, however, investigate this
aspect in medium-size lakes where its relevance could be questionable. In order to study the area of influence of the two major tributary
rivers in Lake Iseo, a rotating vertically distorted physical model of the northern part of this lake was prepared and used, respecting both
Froude and Rossby similarity. The model has a horizontal length scale factor of 8000 and a vertical scale factor of 500 and was used both
in homogeneous and in thermally stratified conditions. We explored the pattern of water circulation in front of the entrance mouth for dif-
ferent hydrologic scenarios at the beginning of spring and in summer. We neglected the influence of winds. The primary purposes of the
model were twofold: i) to increase our level of knowledge of the hydrodynamics of Lake Iseo by verifying the occurrence of dynamical
effects related to the Earth’s rotation on the plume of the two tributaries that enter the northern part of the lake and ii) to identify the areas
of the lake that can be directly influenced by the tributaries’ waters, in order to provide guidance on water quality monitoring in zones of
relevant environmental and touristic value. The results of the physical model confirm the relevant role played by the Coriolis force in the
northern part of the lake. Under ordinary flow conditions, the model shows a systematic deflection of the inflowing waters towards the
western shore of the lake. The inflow triggers a clockwise gyre within the Lovere bay, to the West of the inflow, and a slow counter-clockwise
gyre, to the East of the inflow, that returns water towards the river mouth along the eastern shore. For discharges with higher return period,
when only the contribution by Oglio River is relevant, the effect of the Earth’s rotation weakens in the entrance zone and the plume has a
more rectilinear pattern, whilst in the far field the current driven by the inflows keeps moving along the western shore. On the basis of
these results one could expect that the north-western part of the lake between Castro and Lovere, although not aligned with the tributaries’
axes, is more sensitive to accumulation effects related to river-borne pollution. The results obtained with the physical model are critically
compared with data obtained from different sources: the trajectory of a lagrangian drogue; a map of reflectivity data from the lake floor;
a map of water turbidity at the intrusion depth. The findings are also confirmed by the results of a 3D numerical model of the lake
Effect of alpha-adrenergic blockade on macro- and microvascular perfusion and LV function in patients with ischemic heart disease.
No full textnot availabl
Multifrequency JVLA observations of the X-shaped radio galaxy in Abell 3670
No full textContext. X-shaped radio galaxies (XRGs) exhibit a pair of bright primary lobes and a pair of weak secondary lobes ("wings"), which are oriented with an angle that gives the structure a cross-like shape. Though several theoretical models have been proposed to explain their origin, there is currently not a general consensus on a formation scenario. Aims. We analysed new multifrequency Karl G. Jansky Very Large Array (JVLA) radio data at 1.5, 5.5, 6, and 9 GHz of the candidate XRG in Abell 3670 (A3670) in order to characterise and classify it for the first time and to investigate its origin. Methods. We produced flux, spectral index, and radiative age maps of A3670 by means of the new radio data. We investigated the connection between the radio galaxy and its host, a brightest cluster galaxy (BCG) with two optical nuclei classified as a dumbbell galaxy. Finally we discussed the literature models and compared them to the observed properties of A3670. Results. We classify A3670 as a Fanaroff-Riley I-type XRG and measured a 1.4 GHz radio power of P1.4 = 1.7 × 1025 W Hz-1. By estimating the radiative age of the various source components, we find that the wings are Δt ≃ 20 Myr older than the lobes. We verified that the lobes and wings are aligned with the major and minor axes of the optical galaxy, respectively, and we estimated a black hole mass of MBH ∼ 109 M⊙, which is in agreement with the typical properties of the XRGs. Conclusions. Among the discussed scenarios, the jet-shell interaction model may best reproduce the observed properties of A3670. The gas of a stellar shell is responsible for the deflection of the jets, thus forming the wings. The presence of stellar shells in A3670 is plausible, but it needs further optical observations to be confirmed
Study of tributary inflows in Lake Iseo with a rotating physical model. (accepted for pubblication in Journal of Limnology on October 16th 2013, and prepublished in Techical Reports of DICATAM, N. 12, 2013, pag. 24)
No full textThe influence of Coriolis force on the currents of large lakes is well attested; very few contributions, instead, investigate this aspect in medium-size lakes where its relevance could be questionable. In order to study the area of influence of the two major tributary rivers in Lake Iseo, a rotating vertically distorted physical model of the northern part of this lake has been prepared and used, respecting both Froude and Rossby similarity. The model has a horizontal length scale of 8000 and a vertical scale of 500 and has been used both in homogeneous and in thermally stratified conditions. We explore the pattern of water circulation in front of the entrance mouth for different hydrologic scenaria at the beginning of spring and in summer and in the absence of winds. The primary purposes of the model were twofold: 1) to increase our level of knowledge of the hydrodynamics of Lake Iseo by verifying the occurrence of dynamical effects related to the Earth’s rotation on the plume of the two tributaries which enter the northern part of the lake and 2) to identify the areas of the lake which can be directly influenced by the tributaries waters, in order to provide guidance on water quality monitoring in zones characterized by relevant environmental and touristic value.
The results of the physical model confirm the relevant role played by the Coriolis force in the northern part of the lake. Under ordinary flow conditions, the model shows a systematic deflection of the tributary waters towards the western shore of the lake, triggering a clockwise gyre within the Lovere bay and a slow counter-clockwise gyre that returns water towards the river mouth moving along the eastern shore. For discharges with higher return period, when only the contribution by Oglio River is relevant, the effect of the Earth’s rotation weakens in the entrance zone and the plume has a more rectilinear pattern, whilst in the far field the current driven by the inflows keeps moving along the western shore.
On the basis of these results one could expect that the north-western part of the lake between Castro and Lovere, although not allineated with respect to the tributaries axis, is more sensitive to accumulation effects related to river-borne pollution. The results obtained with the physical model are critically compared with data obtained from different sources: the trajectory of a Lagrangian drogue; a map of reflectivity data from the lake floor; a map of water turbidity at the intrusion depth. They are also confirmed by the results of a 3D numerical model of the lake
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
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