10,351 research outputs found
Qualitative Inquiry in an Age of Educationalese
In this introduction we reflect on two key questions that initiated this special issue on qualitative inquiry: What can qualitative researchers do to regain their post-paradigm-wars cache? How do we avoid distracting “science wars” in the future? We suggest that the strong tendency to narrow the research methods accepted as “scientific” – because they adopt quantitative perspectives and are presumed a priori to be more rigorous – has created an educationalese, a narrative of rigid categories that has not necessarily contributed to more effective or persuasive educational research. The article ends by suggesting that the use of “knowledge mobilization” strategies would help to strengthen qualitative research and educational research in general
Linearized stability of charged thin-shell wormholes
The linearized stability of charged thin shell wormholes under spherically
symmetric perturbations is analized. It is shown that the presence of a large
value of charge provides stabilization to the system, in the sense that the
constrains onto the equation of state are less severe than for non-charged
wormholes.Comment: 8 pages, 2 figures; v2: minor changes. Accepted for publication in
General Relativity and Gravitatio
Self-existing objects and auto-generated information in chronology-violating space-times : a philosophical discussion
Consistency demands an harmony between local and global affairs that excludes grandfather-like paradoxes. However, self-existing objects trapped in CTCs are not seemingly avoided by the standard interpretation of this principle, usually constrained to a dynamical framework. In this paper we discuss whether we are committed to accept an ontology with self-existing objects if CTCs actually occur in the universe. In addition, the epistemological status of the Principle of SelfConsistency is analyzed and a discussion on the information flux through CTCs is presented.Fil: Romero, Gustavo Esteban. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Torres, Diego F.. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentin
Numerical integration of the stochastic Landau-Lifshitz-Gilbert equation in generic time-discretisation schemes
We introduce a numerical method to integrate the stochastic
Landau-Lifshitz-Gilbert equation in spherical coordinates for generic
discretization schemes. This method conserves the magnetization modulus and
ensures the approach to equilibrium under the expected conditions. We test the
algorithm on a benchmark problem: the dynamics of a uniformly magnetized
ellipsoid. We investigate the influence of various parameters, and in
particular, we analyze the efficiency of the numerical integration, in terms of
the number of steps needed to reach a chosen long time with a given accuracy.Comment: 9 pages and 7 figure
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