1,720,984 research outputs found
Comparison of standard and stabilization free Virtual Elements on anisotropic elliptic problems
Full text linkIn this letter we compare the behaviour of standard Virtual Element Methods (VEM) and stabilization free Enlarged Enhancement Virtual Element Methods (E2V EM) with the focus on some elliptic test problems whose solution and diffusivity tensor are characterized by anisotropies. Results show that the possibility to avoid an arbitrary stabilizing part, offered by E2V EM methods, can reduce the magnitude of the error on general polygonal meshes and help convergence
Neo-Auratic Encoding: Phenomenological Framework and Operational Patterns
No full textIn the theoretical model of the Audiotactile Formativity which has recently been put forward by the author, two crucial notions can be identified: the audiotactile principle (ATP) and the neo-auratic encoding (NAE). The latter is intended, from the point of view of a cognitive anthropology, as the whole of the cognitive and aesthetic processes which spring from the availability of audio(visual) recording. The function of the NAE is highly relevant as far as the phenomenological detection of those musical traditions called “audiotactiles” (jazz, rock, world music) which, albeit showing shared formative-receptive devices with oral cultures under the poietic and aesthesic point of view, keep their distance from them from the perspective of the anthropology of the text, which ceases to be evanescent and transitory, and crystallizes on the audio(visual) medium. The audiotactile music is thus made available to the criteria of the late-modern aesthetic by this state of affairs, and in this respect it differs from the music of traditional cultures; moreover, textual identity cannot be traced back to a mere performative tradition, as it happens in oral cultures, but it physically takes the shape of the recorded artifact. This essay analyzes some of the operational modalities through which the cognitive processes linked to the NAE participated in and underwent modifications during the history of rock and jazz, and in correlation with recorded Western art music. In the first part of the twentieth century, the neo-auratic phenomenology, influenced by the pre-magnetic recording techniques, allowed for temporal reversibility only with an aesthesic function, with the ability to listen repeatedly to a given recording. This cognitive dimension (Primary NAE) promotes the priority of the performative aspect, with its irreversible internal temporality, of which the recording represented a sound document (an “allographic” documentary function in the case of Western art music, and “autographic” in the case of jazz). In the second half of the twentieth century, with the introduction of recording techniques on magnetic tape, which allowed editing and montage processes, temporal reversibility is established at the poietic level as well, allowing the insertion of allogenic temporalities in the recorded artifact (Secondary NAE), homologously to musique concrète and electronic music. This introduced a new cognitive image of the recorded artifact, which moves away from the documentation of an irreversible event, becoming a self-determined phenomenological object, made more and more independent by the performative process (rock phenomenology is connected more to this cognitive shift than to stylistic processes). These different operational models of the NAE mark the transition from the Era of Technical Reproducibility of work of art – for audiotactile music, but also for Western art music – to that of Technical Producibility, in which we still live
A robust VEM-based approach for flow simulations in poro-fractured media
Full text linkIn this paper, a Virtual Element Method (VEM)-based approach is proposed for the simulation of flow in fractured porous media. The method is based on a robust meshing strategy, capable of producing conforming polyhedral meshes of intricate geometries and relies on the robustness of the VEM in handling distorted and elongated elements. Numerical tests in challenging configurations are presented and discussed, also in a time-dependent setting to show the viability and the effectiveness of the method
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
An Imaging-Informed Mechanical Framework to Provide a Quantitative Description of Brain Tumour Growth and the Subsequent Deformation of White Matter Tracts
Full text linkVariations 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
SUPG stabilization for the nonconforming virtual element method for advection–diffusion–reaction equations
No full textWe present the design, convergence analysis and numerical investigations of the nonconforming virtual element method with
Streamline Upwind/Petrov–Galerkin (VEM-SUPG) stabilization for the numerical resolution of convection–diffusion–reaction
problems in the convective-dominated regime.
According to the virtual discretization approach, the bilinear form is split as the sum of a consistency and a stability term. The
consistency term is given by substituting the functions of the virtual space and their gradients with their polynomial projection in
each term of the bilinear form (including the SUPG stabilization term). Polynomial projections can be computed exactly from the
degrees of freedom. The stability term is also built from the degrees of freedom by ensuring the correct scalability properties with
respect to the mesh size and the equation coefficients.
The nonconforming formulation relaxes the continuity conditions at cell interfaces and a weaker regularity condition is
considered involving polynomial moments of the solution jumps at cell interface. Optimal convergence properties of the method
are proved in a suitable norm, which includes contribution from the advective stabilization terms. Experimental results confirm the
theoretical convergence rate
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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