1,721,170 research outputs found
Un enigma rinascimentale: le armi e i libri di Pietro del Monte (1457-1509)
Full text linkLa mia ricerca esplora alcune opere di Pietro Monte, pubblicate a Milano fra il 1492 e il 1509, dedicate a vari argomenti quali scherma, duelli, lotta, fisiognomia, filosofia, teologia, scienze naturali e via dicendo; l'identità dell'autore è tutt'ora incerta, anche se doveva trattarsi di un personaggio piuttosto noto viste le sue frequentazioni con Leonardo da Vinci e Baldassarre Castiglione, che lo elogia ripetutamente nel Libro del Cortegiano. Data la notevole conoscenza della lingua spagnola e degli usi militari iberici si è ipotizzato che fosse un maestro d'armi spagnolo emigrato in Italia (Anglo 1989, 2000; Forgeng 2014, 2018) tuttavia propendo per una teoria alternativa che lo identifica in Pietro del Monte Santa Maria (Fontaine 1991, 1992; van Houdt e Sperber, 2014; Brioist 2014, 2016, 2019; attualmente la famiglia si chiama Bourbon del Monte). Costui era un condottiero inizialmente al servizio di Firenze dove conosce Machiavelli, per poi passare a Venezia nel 1507; morto nella battaglia di Agnadello del 1509, la sua fine viene ricordata con toni eroici da numerosi autori coevi, fra cui Marin Sanuto, Luigi Guicciardini e Pietro Bembo. Dopo aver ricostruito la biografia di quest'ultimo e discusso delle problematiche relative alla sua identità, la mia ricerca presenta un'ampia esposizione della letteratura schermistica italiana ed europea fino al tardo XVI secolo, per poi analizzare gli Exercitiorum atque Artis militaris Collectanea (1509), la pubblicazione più nota del Monte, e studiarne gli insegnamenti bellici inserendoli nel più ampio contesto della scherma europea del periodo
Asymptotic Performance Limits of Switches with Buffered Crossbars supporting Multicast Traffic
No full textInput queued (IQ) switches exploiting buffered crossbars (CICQ switches) are widely considered very promising architectures that outperform IQ switches with bufferless switching fabrics both in terms of architectural scalability and performance. Indeed the problem of scheduling packets for transfer through the switching fabric is significantly simplified by the presence of internal buffers in the crossbar, which makes possible the adoption of efficient, simple and fully distributed scheduling algorithms. This paper studies the throughput performance of CICQ switches supporting multicast traffic, showing that, similarly to IQ architectures, also CICQ switches with arbitrarily large number of ports may suffer of significant throughput degradation under "pathological" multicast traffic patterns. Despite the asymptotic nature of these results, the authors believe that they can contribute to a deeper understanding of the behavior of CICQ architectures supporting multicast traffi
BLACK HOLES IN SUPERGRAVITY AND HAMILTON-JACOBI FORMALISM
Full text linkIn my thesis we have addressed the issue of the first order description of generic stationary axisymmetric black holes in supergravity. To this the end we extended the extend the Hamilton-Jacobi formalism from mechanical models, whose degrees of freedom depend on just one variable, to field theories where the degrees of freedom depend on two or more variables. This problem was addressed and developed in generality in field theory, but not much was known in the context of gravitational field theories. An important issue in this thesis was to apply such extended formalism to the study of black holes. We have worked with the so-called De Donder-Weyl-Hamilton-Jacobi (DWHJ) theory, which is the simplest extension of the classical Hamilton-Jacobi approach in mechanics. One important difference with respect to the case of classical mechanics consists in the replacement of the Hamilton principal function S, directly related to the fake-superpotential of static black holes, with a Hamilton principal 1-form, which is a covariant vector Si. The application of this formalism to the description of axisymmetric solutions black holes required working out the general form of the principal functions Sm associated with the corresponding effective 2D sigma-model in the DWHJ setting. We have also given a characterization of the general properties of such solutions with respect to the global symmetry group of the effective 2D sigma-model which describes them. This was done by introducing, aside from the Nöther charge matrix, a further characteristic constant matrix Qψ, in the Lie algebra of G(3), the global symmetry properties of affine solutions 2D model, associated with the rotational motion of the black hol
Capacity Scaling in Ad Hoc Networks with Heterogeneous Mobile Nodes: the Sub-critical Regime
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