1,721,145 research outputs found
Ipertensione arteriosa sistemica nel gatto. Nota II: aspetti clinico-diagnostici ed orientamenti di terapia
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Coupling between lumped and distributed models for blood flow problems
No full textIn this paper we propose a method for coupling distributed
and lumped models for the blood circulation. Lumped
parameter models, based on an analogy between the circulatory
system and an electric or a hydraulic network are
widely employed in the literature to investigate different systemic
responses in physiologic and pathologic situations. From the mathematical viewpoint
these models are represented by ordinary differential
equations. On the other hand, for the accurate description
of local phenomena, the Navier–Stokes equations for incompressible
fluids are considered. In the multiscale perspective,
lumped models have been adopted as a numerical
preprocessor to provide a quantitative estimate of
the boundary conditions at the interfaces. However, the two
solvers (i.e. the lumped and the distributed one) have been
used separately. In the present work, we introduce a genuinely
heterogeneous multiscale approach where the local model
and the systemic one are coupled at a mathematical and numerical
level and solved together. In this perspective, we have
no longer boundary conditions on the artificial sections, but
interface conditions matching the two submodels. The mathematical
model and its numerical approximation are carefully
addressed and several test cases are considered.In this paper we propose a method for coupling distributed and lumped models for the blood circulation. Lumped parameter models, based on an analogy between the circulatory system and an electric or a hydraulic network are widely employed in the literature to investigate different systemic responses in physiologic and pathologic situations (see e.g. [4, 11, 13-15, 24, 27, 30]). From the mathematical viewpoint these models are represented by ordinary differential equations. On the other hand, for the accurate description of local phenomena, the Navier-Stokes equations for incompressible fluids are considered. In the multiscale perspective, lumped models have been adopted (see e.g. [16]) as a numerical preprocessor to provide a quantitative estimate of the boundary conditions at the interfaces. However, the two solvers (i.e. the lumped and the distributed one) have been used separately. In the present work, we introduce a genuinely heterogeneous multiscale approach where the local model ..
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
Ingressi e uscite dei rettori veneziani a Brescia tra cerimoniale e infamia pubblica (sec. XVI)
No full textL'articolo analizza i casi di dissenso politico nei confronti dei rettori veneziani a Brescia nel Cinquecento, sulla base di fonti documentarie inedite, cronache e oggetti materiali
Ingressi e uscite dei rettori veneziani a Brescia tra cerimoniale e infamia pubblica (sec. XVI)
No full textL'articolo analizza i casi di dissenso politico nei confronti dei rettori veneziani a Brescia nel Cinquecento, sulla base di fonti documentarie inedite, cronache e oggetti materiali
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
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