1,721,114 research outputs found
La schiuma nelle urine: da Ippocrate alla scuola medica salernitana
No full textLa presenza di schiuma nelle urine fu un segno diagnostico che acquistò rilevanza nelle opere antiche di uroscopia col passare del tempo. Le descrizioni prodotte dagli antichi sono coerenti con specifiche patologie
On the prospects for testing the Dvali Gabadadze Porrati gravity model with the outer planets of the Solar System
No full textThe gravitational model by Dvali, Gabadadze and Porrati could be tested in the Solar System. In this paper the authors investigate this possibility by comparing both analytical and numerical calculations with the latest results in the planetary ephemeris field
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
What do the orbital motions of the outer planets of the Solar System tell us about the Pioneer anomaly?
No full textThe Pioneer Anomaly is not caused by an additional gravitational acceleration, because this effect wold cause measurable effects on the motions of outer Solar Sistem planets
Measuring the relativistic perigee advance with satellite laser ranging
No full textThe pericentric advance of a test body by a central mass is one of the classical tests of general relativity. Today, this effect is measured with radar ranging by the perihelion shift of Mercury and other planets, in the gravitational field of Sun, with a relative accuracy of the order of 10(-2)-10(-3). In this paper, we explore the possibility of a measurement of the pericentric advance in the I gravitational field of Earth by analysing the laser-ranged data of some orbiting, or proposed, laser-ranged geodetic satellites. Such a measurement of the perigee advance would place limits on hypothetical, very weak, Yukawa-type components of the gravitational interaction, with a finite range of the order of 104 km. Thus, we show that, at the I present level of knowledge of the orbital perturbations, the relative accuracy, achievable with suitably combined orbital elements of LAGEOS and LAGEOS II, is of the order of 10(-3). With the corresponding measured value of (2 + 2gamma - beta)/3, by using eta = 4beta - gamma - 3 from lunar laser ranging, we could get an estimate of the PPN parameters gamma and beta with an accuracy of the order of 10(-2)-10(-3). Nevertheless, these accuracies would be substantially improved in the near future with the new Earth gravity field models by the CRAMP and GRACE missions. The use of the perigee of LARES (LAser RElativity Satellite), with a suitable combination of orbital residuals including also the node and the perigee of LAGEOS II, would also further improve the accuracy of the proposed measurement
Life momentum at level crossing: human factor, road-rail safety policies, available technologies. A cross-sectorial challenge playing a rewarding role for the upgrade of safer mobility options
No full textThe relations between occurrences, misbehaviour and type of level crossing itself have been strictly correlated in a quantitative data analysis study (carried out in 2011) of the Italian Railway Investigation Body with the scientific collaboration of Academia.
So far, interaction between the available technologies, the road-railway infrastructure whereabouts, and the behavioural risk perceptive approach has been proved to be rewarding in order to identify the measures to adopt, according to the critical scenario, to manage safety both from the railway role side and from the mobility and road safety policies and strategies.
This paper offers reference data, graphs and schematic analytical approach of the criticalities raised up at level crossing (LC) when both accidents and incidents occurred, and from this set of results emerges the need of synergies and cross operative guidelines of interventions at LC spot. The UNECE, through the expert group in the WP1, should enhance safety at LC by leveraging knowledge, experience from road and railways sector, cooperating to offer parameters and guidelines valuable in a wider context so to make LC in line with the UN plan for sustainable life through a sustainable transport network development worldwide
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