1,721,028 research outputs found
An intervention program promoting abilities to recognize and use psychological lexicon on achievement emotions with secondary school students
No full textWithin educational psychology, achievement emotions have recently roused particular interest for both their theoretical and applied importance (Pekrun & Linnenbrink-Garcia, 2014). Notwithstanding the large amount of research studies focused on them, scarce attention has been paid to specific interventions aiming at developing the abilities necessary to understand and describe achievement emotions, considering these abilities as key components of the construct of emotional competence (Denham, 1998). Therefore, we involved 74 seventh-graders (included in an experimental or in a control group) to test the efficacy of an eight-units intervention program aiming at promoting abilities to recognize and use psychological lexicon related to achievement emotions, embedded within the domain of Italian. First, the students were emotionally involved in a stable way during the whole intervention, with positive emotions more intense than negative emotions. Second, after the intervention students’ abilities to recognize and use psychological lexicon related to achievement emotions improved. Third, the positive effects of the intervention generalized to achievement emotions associated with the domain of Italian and partially of school in general. Finally, these emotions were coherently related to students’ final achievement in Italian. Acknowledging limitations such as the nature of self-report data or the short duration of the intervention, we provided evidence-based indications on the goodness of the program. From an applied perspective, our findings encourage the development of further intervention programs focused on other components of the emotional competence, such as the ability to regulate emotions, based on the awareness of the role played by achievement emotions within school contexts
A relaxed physical factorization preconditioner for mixed finite element coupled poromechanics
No full textIn this paper, we introduce a relaxed physical factorization (RPF) preconditioner for the efficient iterative solution of the linearized algebraic system arising from the mixed finite element discretization of coupled poromechanics equations. The preconditioner is obtained by using a proper factorization of the 3 x 3 block matrix and setting a relaxation parameter alpha. The preconditioner is inspired by the relaxed dimensional factorization introduced by Benzi et al. [J. Comput. Phys., 230 (2011), pp. 6185-6202; Comput. Methods Appl. Mech. Engrg., 300 (2016), pp. 129-145]. A stable algorithm is advanced to compute the optimal value of alpha, along with a lower bound to control the possible ill-conditioning of the alpha-dependent inner blocks. Numerical experiments in both theoretical benchmarks and real-world applications are presented and discussed to investigate the RPF properties, performance, and robustness
A reduced order model-based preconditioner for the efficient solution of transient diffusion equations
Full text linkThis paper presents a novel class of preconditioners for the iterative solution of the sequence of symmetric positive-definite linear systems arising from the numerical discretization of transient parabolic and selfadjoint partial differential equations. The preconditioners are obtained by nesting appropriate projections of reduced-order models into the classical iteration of the preconditioned conjugate gradient (PCG). The main idea is to employ the reduced-order solver to project the residual associated with the conjugate gradient iterations onto the space spanned by the reduced bases. This approach is particularly appealing for transient systems where the full-model solution has to be computed at each time step. In these cases, the natural reduced space is the one generated by full-model solutions at previous time steps. When increasing the size of the projection space, the proposed methodology highly reduces the system conditioning number and the number of PCG iterations at every time step. The cost of the application of the preconditioner linearly increases with the size of the projection basis, and a trade-off must be found to effectively reduce the PCG computational cost. The quality and efficiency of the proposed approach is finally tested in the solution of groundwater flow models. (C) 2016 The Authors. International Journal for Numerical Methods in Engineering Published by John Wiley & Sons Ltd
GReS: A novel multi-physics multi-domain computational tool for geomechanical subsurface simulations
No full textGReS is a novel MATLAB open-source modular platform, specifically designed with the aim at contributing to the development and prototyping of numerical algorithms for fully coupled multi-physics multi-domain geomechanical applications. The idea is to partition the overall computational domain into possibly non-conforming subdomains where different physics and discretization schemes can be used. The GReS concept and its current development state are introduced and discussed with the aid of a few benchmarks showing the code potentials
Approximate inverse-based block preconditioners in poroelasticity
Full text linkWe focus on the fully implicit solution of the linear systems arising from a three-field mixed finite element approximation of Biot’s poroleasticity equations. The objective is to develop algebraic block preconditioners for the efficient solution of such systems by Krylov subspace methods. In this work, we investigate the use of approximate inverse-based techniques to decouple the native system of equations and obtain explicit sparse approximations of the Schur complements related to the physics-based partitioning of the unknowns by field type. The proposed methods are tested in various numerical experiments including real-world applications dealing with petroleum and geotechnical engineering
Il pensiero politico–costituzionale di Chateaubriand e il conflitto tra la nuova e la vecchia Francia (1814–1816)
No full textIl saggio è dedicato alle idee politico-costituzionali sviluppate da Chateaubriand tra prima e seconda Restaurazione: dall'aprile del 1814 al settembre del 1816, infatti, il Visconte bretone pubblica le sue opere politiche più importanti e matura un proprio pensiero politico-costituzionale che, per quanto strettamente legato alla congiuntura politica, non muterà più negli anni a seguire. La sua riflessione, oltre a cogliere le dinamiche politiche, morali e sociali della Francia uscita dall'esperienza imperiale, rappresenta meglio di quello di altri autori coevi la radicalizzazione del conflitto tra la nuova e la vecchia Francia a cui si assiste nel passaggio dalla prima alla seconda Restaurazione, a causa della scioccante esperienza dei Cento Giorni: il "volo dell’aquila" bonapartista costituisce indubbiamente uno spartiacque fondamentale non solo per la Francia, ma anche per Chateaubriand, il cui pensiero, come il saggio tenta di dimostrare, dal luglio 1815 in poi, da una parte si radicalizza sotto il profilo pratico-politico, dall'altro matura dal punto di vista teorico
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
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