1,721,036 research outputs found
An analytical model for the Geotherm in the Basilicata oil fields area (southern Italy)
Full text linkA geothermal model for the area of the Basilicata oil fields has
been obtained by an analytical procedure. The model takes into
account both the temperature variation due to the re-equilibrated
conductive state after thrusting and frictional heating. Input parameters include heat flow density data and a series of geologically derived constraints – thrust depth, timing of thrusting, slip rate – obtained by the integration of surface and subsurface datasets. For the top 5 km of the crust, the resulting geothermal curve shows a remarkably good fit with temperatures recorded from deep oil wells.
The new geotherm provides a fundamental constraint for rheological and stress accumulation modelling in the seismically active study area. Furthermore, the analytical solution provided in this study may be used as a basis to calculate the relevant geotherm for further areas and/or tectonic settings
A study of lithological characteristics of rock volumes surrounding the underground Gran Sasso Laboratories: evaluation of atomic weight, atomic number and density
No full textAl fine di ottimizzare l’analisi dei risultati di alcuni esperimenti condotti nei laboratori sotterranei del Gran Sasso, si è reso necessario valutare l'interazione con i raggi cosmici dei materiali rocciosi per definire il rapporto tra il flusso di energia incidente e il flusso di energia dei raggi cosmici rilevata. L’analisi della stratigrafia e la definizione della composizione litologica sono fondamentali al fine di ottenere peso atomico (Z), numero atomico (A) e densità (ρ) del materiale che un raggio cosmico attraversa prima di essere intercettato dai rivelatori dei laboratori sotterranei. Allo scopo, sono state studiate otto sezioni geologiche attraverso i volumi rocciosi intorno ai laboratori, tracciate come i raggi di una ruota rispetto ad un azimut. In altre parole si considera un cerchio con i Laboratori Nazionali del Gran Sasso al centro: ogni sezione è un diametro del cerchio. Queste sezioni sono distribuite in tutta la gamma degli angoli di azimut (360°), con ogni sezione alla stessa distanza angolare (22° 30') dalle altre adiacenti. Le otto sezioni hanno consentito di determinare la litologia attraversata dai raggi cosmici in funzione degli angoli di zenit e di azimut, quindi di ottenere le caratteristiche fisiche delle rocce del Gran Sasso intorno ai laboratori. Le informazioni suddette hanno inoltre permesso di calcolare la media ponderata di peso atomico, numero atomico e densità per i raggi cosmici rilevati con un angolo zenitale di 70°, 80° e 90°. In tal modo si è potuto evidenziare come le variazioni della litologia, per elevati angoli di zenit, sono in grado di determinare notevoli variazioni del peso atomico, del numero atomico e dei valori di densità
A study of lithological characteristics of rock volumes surrounding the underground Gran Sasso Laboratories: evaluation of atomic weight, atomic number and density
Full text linkNormal-fault stress and displacement through finite-element analysis
Full text linkWe compute displacement and stress due to a normal fault by means of two-dimensional plane-strain finite-element analysis. To do so, we apply a system of forces to the fault nodes and develop an iterative algorithm serving to determine the force magnitudes for any slip distribution. As a sample case, we compute the force magnitudes assuming uniform slip on a 10-km two-dimensional normal fault. The numerical model generates displacement and stress fields that compare well with the analytical solution. In fact, we found little difference in displacements (<5%), displacement orientation (<15°), and stress components (<35%, half of which due to slip tolerance). We analyze such misfit, and discuss how the error propagates from displacement to stress. Our scheme provides a convenient way to use the finite-elements direct method in a trial-and-error procedure to reproduce any smooth slip distribution
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
A numerical study for convection in a cylindrical model with continuously varying viscosity
No full textAppropriate 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
A study of Gran Sasso rock composition at large zenith angles: evaluation of Z, A and density
No full textINFN/UB-FI-98/
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