1,721,049 research outputs found
Ripensare formazione e competenze nell’outdoor education: l’approccio “on the door” emergente dal progetto Dolomiti-Unesco
Full text linkL’attuabilità di obiettivi politico-sociali di transizione ecologica passa per la qualificazione dei sistemi d’istruzione e formazione e della professionalità docente. Il progetto Dolomiti-Unesco illustra un’esperienza di formazione nelle scuole che ha coinvolto docenti e studenti in attività di outdoor education ed esperienze esplorative nell’ambiente naturale entro il territorio dolomitico. La riflessione sul percorso intrapreso ha contribuito a far emergere un approccio “on the door” che coniuga indoor e outdoor nella metodologia e nella formazione contribuendo al loro miglioramento e qualificazione. Questo consente di ripensare la capacità di incidere bottom-up sul cambiamento di sistema e influenzare le politiche formative. Inoltre, tratteggia nuove direzioni da intraprendere per rendere attuabile la sostenibilità di comunità sociali e civili realmente coinvolte, responsabili e capaci di costruire un’agency individuale e collettiva in grado di generare cambiamenti futuri
Exact controllability to eigensolutions for evolution equations of parabolic type via bilinear control
Full text linkIn a separable Hilbert space X, we study the controlled evolution equationu'(t) + Au(t) + p(t)Bu(t) = 0,where A >= -sigma I (sigma >= 0) is a self-adjoint linear operator, B is a bounded linear operator on X, and p is an element of L-loc(2) (0, +infinity) is a bilinear control. We give sufficient conditions in order for the above nonlinear control system to be locally controllable to the jth eigensolution for any j >= 1. We also derive semi-global controllability results in large time and discuss applications to parabolic equations in low space dimension. Our method is constructive and all the constants involved in the main results can be explicitly computed
Exact controllability to eigensolutions of the bilinear heat equation on compact networks
No full textPartial differential equations on networks have been widely investigated in the last decades in view of their application to quantum mechanics (Schrodinger type equations) or to the analysis of flexible structures (wave type equations). Nevertheless, very few results are available for diffusive models despite an increasing demand arising from life sciences such as neurobiology. This paper analyzes the controllability properties of the heat equation on a compact network under the action of a single input bilinear control. By adapting a recent method due to [F. Alabau-Boussouira, P. Cannarsa, C. Urbani, Exact controllability to eigensolutions for evolution equations of parabolic type via bilinear control, arXiv:1811.08806], an exact controllability result to the eigensolutions of the uncontrolled problem is obtained in this work. A crucial step has been the construction of a suitable biorthogonal family under a non-uniform gap condition of the eigenvalues of the Laplacian on a graph. Application to star graphs and tadpole graphs are included
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
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
Soil transmitted helminth (STH) infections in an indigenous community in Ortigueira, Paraná, Brazil and relationship with its nutritional status
No full textDispelling 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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