1,721,182 research outputs found
An Algorithm for the Anisotropic Adaptivity of Unstructured Triangular Meshes
No full textIt is well recognized today the importance of anisotropic meshes when it is solved a
problem whose solution exhibits a substantial anisotropy. Most of the times it is better to build
these meshes adaptively, and a corresponding algorithm is proposed in this paper. A comparison
is made with the existing leading algorithms for the adaptive refinement of isotropic meshes, i.e.
regular refinement and longest-edge bisection
Adaptivity in Space and Time for Shallow Water Equations
No full textIn this paper, adaptive algorithms for time and space discretizations are added to an existing
solution method previously applied to the Venice lagoon tidal
circulation problem. An analysis of the interactions between space and
time discretizations adaptation algorithms is presented. In particular
it turns out that both error estimation in space and time must be
present for maintaining the adaptation efficient. Several advantages,
for adaptivity and for time decoupling of the equations,
offered by the operator splitting adopted for shallow waters equations
solution are put in evidenc
Assemblaggi di frontiera. Le operaie della Foxconn a Ciudad Juárez, Messico
Full text linkBased on ethnographic research carried out between March and September 2014 in Foxconn's factories and in the working-class district of Ciudad Juárez (Mexico), this paper analyzes some aspects of the role of gender in globalized industrial production for export. In particular, the ethnographic analysis suggests that the symbolic and discursive practices adopted by the corporation management and by the institutional apparatus for gender equal opportunities obscure the degradation processes to which women are subjected in both labor and reproductive processes. Furthermore, research highlights how these practices aim to transform the subjectivity of the workforce by bending it to the needs of global businesses and the patriarchal system. Finally, the analysis of the empirical material highlights how the female workers themselves, through direct and symbolic action, counteract this process of degradation
A Fast Numerical Homogenization Algorithm for Finite Element Analysis
No full textA numerical homogenization method is here presented to solve problems
governed by partial differential equations with coefficients that are
generic functions in . It consists of a recursive finite elements discretization and an
algebraic homogenization. This method takes advantages for speed and memory
occupation from the hierarchy of elements and nodes defined by
the recursive discretization. It turns out that using state-of-the-art
general linear algebra techniques, all non-numerical data manipulations that are
typically done before real computations, can be avoided
A Linear System Solver for Adaptive FEM
No full textIn this paper it is presented an approximate direct solver
for systems of linear equations arising from finite element
discretizations.
The approximation is implemented using estimates arising from
functional analysis or matrix analysis of the differential problem
discretized using finite elements, or of its discrete counter-part.
It results an advantage in terms of less matrix updates during the
factorization, and possibly less {\it fill-in} and less equations to
be included in the factorization (with a considerable computational
saving, in this case). This last advantage arise frequently during
successive updates of the solution after refinement/un-refinement
steps in an adaptive analysis.
The basic principle underlying the method here proposed is related to
the knowledge of the Green's function associated to the differential
problem discretized by finite elements.
Early experimentation shows the method to be promising
Least squares FEM approximation and subgrid extraction for convection dominated problems
No full textAs it is well known, the Galerkin FEM gives an oscillating solution in convection dominated problems.
The oscillations grow in magnitude with the Peclet number and may even totally hide the true solution.
The cure commonly used is to modify a-priori the formulation of the problem, by adding a stabilizing term to avoid an oscillating solution. This is called a stabilized method.
Here, instead, we analyze these oscillations from a least squares perspective and propose a post-processing technique that both stabilizes the solution and partially resolve the sub grid scales
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
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