1,721,150 research outputs found
Arbitrary-Lagrangian-Eulerian finite volume IMEX schemes for the incompressible Navier-Stokes equations on evolving Chimera meshes
No full textIn this article we design a finite volume semi-implicit IMEX scheme for the incompressible Navier-Stokes equations on evolving Chimera meshes. We employ a time discretization technique that separates explicit and implicit terms, accommodating the multi-scale nature of the governing equations, which involve both time scales of diffusion and advection operators. The finite volume approach for both explicit and implicit terms allows to encode into the nonlinear flux the velocity of displacement of the Chimera mesh via integration on moving cells. The numerical solution is then projected onto the physically meaningful solution manifold of non-solenoidal fields that stems from the energy equation. To attain second-order time accuracy, we employ semi-implicit IMEX Runge-Kutta schemes. These novel schemes are combined with a fractional-step method, thus the governing equations are eventually solved using a projection method to satisfy the divergence-free constraint of the velocity field. The implicit discretization of the viscous terms allows the CFL-type stability condition for the maximum admissible time step to be only defined by the relative fluid velocity referred to the movement of the frame and not depending on the viscous terms. Communication between different grid blocks is enabled through compact exchange of information from the fringe cells of one mesh block to the field cells of the other block. The continuity of the solution is recovered in one-shot during the solution of the arising algebraic systems by not involving neither direct discretization of the differential operators on fringe cells nor an iterative Schwartz-type method. Free-stream preservation property, i.e. compliance with the Geometric Conservation Law (GCL), is respected at the order of the scheme. The accuracy and capabilities of the new numerical schemes are proved through an extensive range of test cases, demonstrating ability to solve relevant benchmarks in the field of incompressible fluids
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
Sixteen and pregnant as my mom: Transgenerational aspects of teenage pregnancy
No full textIn Italy 90% of teen pregnancies occur in young women who are daughters of teenage mothers (Istat, 2012). Supposing a transgenerational transmission (Abraham&Torok, 1987) these data could be read as the perpetuation from mother to daughter of unprocessed aspects that go along with the feminine separation-individuation process that happens in the name of the 'same' (Nunziante-Cesàro, 2014). Teenage pregnancies may represent the attempt to act the desire of a child 'repairer' or to hit the sexual body (Pines, 1988; Ammaniti et al., 1997). In a wider research field that investigates motherhood at risk (Margherita, Gargiulo, Martino, 2014; 2015; Troisi, Gargiulo, Tessitore, 2015), the study explores the relation between the representation of teenagers' pregnant experiences and the maternal ones.
15 women that have had a teenage pregnancy, daughters of teenage mothers were interviewed. A semi-structured interview, based on the Teen Mother Interview (Bohr, 2005), was built to investigate the reconstruction of the pregnancy experience and the relation with mothers. We have submitted the interviews corpus to a content analysis.
From the analysis, in the area of the pregnancy experience, the categories of meaning that emerge are: the asymptomatic body, the concreteness of the birth and the interrupted adolescence. The pregnancy discovery comes late and its description is flattened on the birth, on the background of an adolescence lived between regret and denial. In the area of the relation with their mother, the categories: ‘same mistake’, ‘now we are two adult women’ and the overlapping roles, recall a repetition directed to the conquest of an adult identity, as the maternal one, in which roles recognition is hard.
The emerging difficulties in mentalizing the body's restructurings and the acquisition of an adult identity, searched through imitative thrusts, on the background of confused roles, support the necessity of preventive interventions (Riva Crugnola, 2014)
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
Free surface dynamics in the impact of a rigid wedge - Part B
No full textIn this paper, we present the implementation of a lattice Boltzmann free surface algorithm for the simulation of water entry problems. The aim of this work is to isolate the effects of asymmetric impact on the water entry of a rigid wedge. Simulations for different heel angles were conducted in order to evaluate the influence of this parameter on the wedge dynamics, pile-up evolution, and velocity distribution. Our results indicate that the heel angle remarkably influences the physics of water impact
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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