1,721,213 research outputs found
Comparative analysis of Chinese FL didactics : an exploratory study into methodological approaches, teaching strategies and materials between Italy and France
No full textNelle ultime decadi il Cinese Lingua Straniera (CLS) è divenuto particolarmente rilevante all’interno dei contesti formativi francesi e italiani. Questo trend positivo trova riscontro nell’alto numero di università, istituti privati e scuole secondarie che offrono corsi di CLS, probabilmente in risposta al crescente interesse per le lingue orientali da parte di discenti di tutte le età. Nonostante ciò, i dati sulla didattica del CSL negli istituti secondari ed accademici in Italia sono ancora piuttosto carenti. La nostra ricerca intende esplorare la dimensione didattica del CSL in Italia e Francia in ottica comparativa. Lo studio include tre sezioni: la prima affronta la disciplinarizzazione del CSL nei due Paesi, la seconda indaga gli approcci metodologici e le tecniche didattiche principalmente evincibili dall’analisi dei libri di testo prodotti nei due Paesi, la terza riporta uno studio di caso sulla didattica digitale applicata al CSL e una riflessione sulle pratiche didattiche
Heat content asymptotics in sub-Riemannian geometry
No full textSub-Riemannian geometry is a particularly rich class of metric structures, which generalizes Riemannian geometry, where a smoothly varying metric is defined only on a subset of preferred directions of the tangent space at each point of a smooth manifold M (called horizontal directions). Under the so-called Hörmander condition, M is horizontally-path connected, and the usual length-minimization procedure yields a well-defined metric. The Laplace-Beltrami operator is generalized by the sub-Laplacian which is sub-elliptic, but has nonetheless suitable regularity properties (in particular, it is hypoelliptic). In this thesis, we investigate the heat content asymptotics and related topics in sub-Riemannian geometry.
For a domain in M, the heat content is defined as the total amount of heat contained in the domain at time t, assuming that its boundary is kept at zero
temperature for all times. In the Heisenberg group, which is the simplest example of sub-Riemannian structure, Tyson and Wang studied the small-time
behavior of this quantity, proving the existence of an asymptotic expansion up to order 2 in square root of t. Here, using a different approach, we show
the existence of a complete asymptotic expansion of the heat content in any sub-Riemannian manifold, also providing an algorithm for computing its coefficients at any order. As in the Riemannian case, the small-time behavior of the heat content contains geometrical information of the boundary of the
domain.
A crucial assumption on the domain for developing a complete asymptotic expansion of the heat content is the absence of characteristic points. Roughly speaking, a characteristic point is a point of the boundary of the domain (which is assumed to be a smooth submanifold of M) where the distance function from the boundary itself loses regularity. We show that, if characteristic points are present a new phenomenon occurs in the asymptotic expansion of the heat content. In particular, the latter can no longer be true to order equal to or greater than 5, in general. In addition, we study the horizontal mean curvature of the boundary when characteristic points are present. In the particular case of the Heisenberg group, we introduce the notion of a mildly degenerate characteristic point, proving new integrability results for the horizontal mean curvature of surfaces. This result, in the case of analytic surfaces in the Heisenberg group, answers affirmatively to a conjecture formulated by Danielli, Garofalo and Nhieu.
Finally, we study a related, yet different, quantity called the relative heat content. For a domain in M, the relative heat content is defined as the total amount of heat contained in the domain at time t, allowing the heat to flow outside the domain. Significant difficulties emerges, as the boundary behavior of the temperature function is no longer known, as opposed to the case of the classical heat content. We use an “asymptotic” symmetry argument of the heat diffusion to obtain information on the small-time behavior of temperature at the boundary of the domain and we obtain a fourth-order asymptotic expansion in square root of t
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
INFUSION PRESSURE CONTROL SYSTEM
Full text linkAn infusion pressure control system for ophthalmic surgery includes: - intraocular pressure detection means; - arterial pressure detection means; and a control unit operatively connected to said intraocular pressure detection means and said arterial pressure detection means and configured for calculating the mean ocular perfusion pressure value based on the intraocular pressure and arterial pressure values provided by said intraocular pressure detection means and by said arterial pressure detection means, and for comparing said calculated mean ocular perfusion pressure value and at least one predetermined threshold value
Analyzing and assessing operational risk in supply chain through Petri nets and simulation techniques
No full textSISTEMA E METODO DI CONTROLLO DELLA PRESSIONE DI INFUSIONE OCULARE PER INTERVENTI DI CHIRURGIA OFTALMICA
Full text linkLa presente invenzione riguarda un sistema ed un metodo di controllo della pressione di infusione oculare per interventi di chirurgia oftalmica
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
Performance improvement of manual assembly lines in a context characterized by complexity
No full textThe researchers' difficulty at transferring the scientific knowledge to practitioners and the existence of a gap among the methods developed in literature and the real life problem are issues recognized by literature and seems that they have not been solved yet. The aim of the present work is to outline a methodology that is successfully applicable to the industrial context, i.e. that is able to both take in account of the difficulty of managing a high number of different components and materials and assure the correct line balancing to gain performance improvement of the assembly lines as well as the maintain of such better performance over time. Among the techniques presented by literature, the "kaizen assembly" is exploited to perform the line balancing and to be transferred to practitioners. As the methodology addresses a typical industrial issue, it is outlined through its application to the case of an Italian plant of a chocolatier and confectionery company, leader in the market of premium quality chocolate. In order to get such a difficult result, firstly, a methodology to reduce the complexity is proposed and applied to the case study, by identifying groups of components distinct based on commonalities in the job elements and cycle times, rather than on part-IDs. Secondly "kaizen assembly" are performed and lean manufacturing techniques are applied in order to enhance the assembly lines performance and reach a set target. This allowed the company to achieve the performance objective and to maintain changes steady over time, confirming the validity of the approach
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