OALib Journal期刊

ISSN: 2333-9721




2015 ( 35 )

2014 ( 49 )

2013 ( 35 )

2012 ( 53 )


匹配条件: “Pepe” ,找到相关结果约454条。
El cuento de las verdades inútiles
Pepe Lillo
[email protected] : Revista de Medicina, Lenguaje y Traducción , 2010,
Por la boca
Pepe Lillo
[email protected] : Revista de Medicina, Lenguaje y Traducción , 2006,
Cinema as a Didactic Support in Foreign Language Classroom
Francesco PEPE
Studii de Stiinta si Cultura , 2012,
Abstract: This article proposes a reflection on the pedagogical use of film in foreign languageclassroom, taking into account both the objectives of language learning and of film analysis. This isbased on the narrative specifics of cinema that have highly motivating characteristics for theforeign language learner. The analytical framework which is devoted to film the second part of thearticle can be viewed as an integrated learning path that develops activities focused on the elementsof the film, its historical and socio-cultural background and many tasks generating linguisticproductions.
Improper Narratives: Egyptian Personal Blogs and the Arabic Notion of Adab
Teresa Pepe
LEA : Lingue e Letterature d'Oriente e d'Occidente , 2013,
Abstract: In recent years several international scholars have started to move beyond the social and political effect of blogging to define blogs in terms of literary writing (See Fitzpatrick, 2006; Himmer 2004; Van Dijk, 2004). Also in the Arab world, the fact that several blogs have been turned into books and have had considerable success, has provoked a debate over the literary status of blogs: while some critics hail them as a new literary experiment, others claim that they do not have the legitimacy to be included in the category of adab (literature). This has perhaps to do with the fact that in the Arab world (as elsewhere) printed books enjoy more prestige; but also with the fact that the Arab notion of adab is gradually coinciding, though still differing from the European notion of “literature”, and this defines the boundaries of the literary field. In other words, to claim that a work is “literary” because it has aspects of “literariness”, does not wholly correspond to saying that it is adabī, i.e. “literary” for Arab critics. In this article I will discuss aspects of literariness and adab-icity by means of an analysis of the blog al-Kanabah al- amrā (The Red Sofa), written by the Egyptian Bilāl usnī. The blog has been reviewed in several Egyptian newspapers and literary websites as “an interactive fiction” or a “adabī/literary and visual blog”. However, its style, contents and materiality challenge both our notion of “literature” and the Arab concept of adab.
Confinement and the center of the gauge group
Michele Pepe
Physics , 2005, DOI: 10.1016/j.nuclphysbps.2006.01.045
Abstract: The question of the role of the center of the gauge group in the phenomenon of confinement in Yang-Mills theory is addressed. The investigation is performed from the most general perspective of considering all possible choices for the gauge symmetry group. In this context, an interesting role is played by G(2) Yang-Mills theory: the simplest pure gauge theory with a trivial center and without 't Hooft flux vortices. Numerical simulations show the presence of a first order finite temperature deconfinement phase transition in G(2) Yang-Mills theory in (3+1) dimensions. Interestingly, the G(2) gauge symmetry can be broken to an SU(3) subgroup by the Higgs mechanism. We investigate the relation between the deconfinement phase transition in G(2) and SU(3) Yang-Mills theories by numerical simulations in the G(2) gauge-Higgs system.
Field transformation and Monte Carlo simulations
M. Pepe
Physics , 1998, DOI: 10.1016/S0920-5632(99)85225-6
Abstract: A new method to compute observables at many values of the parameters \lambda for a model with lattice action {\cal{S}}(\phi, \lambda) is described. After fixing a reference set \lambda^r of parameters, a single simulation is carried out by using a ``reference action'' {\cal{S}} (\phi^r, \lambda^r) to generate configurations of the field \phi^r. Then a suitable analytic transformation is performed from the configurations of \phi^r to the ones corresponding to the action {\cal{S}} (\phi, \lambda). Such a transformation allows to obtain the observables for values of the parameters \lambda close to \lambda^r. I present studies on the reliability of the algorithm in the case of the \phi^4 model in 2 dimensions.
Results on charged kaon and hyperon decays from NA48
Monica Pepe
Physics , 2008,
Abstract: Recent results from the NA48/1 and NA48/2 experiments at the CERN SPS are presented. NA48/2 carried out data taking in 2003 and 2004 collecting charged kaon decays: branching ratios and form factors have been measured for the rare K+- to pi+-e+e-, K+- to pi+-gammagamma and K+- to pi+-e+e-gamma decays. The NA48/1 experiment has taken data in 2002 using only the Ks beam at an increased intensity measuring neutral hyperon radiative decays. Using this data, which exceeds present statistics by about one order of magnitude, a new precise measurement of the Csi_0 decay asymmetries has been obtained.
Deconfinement in Yang-Mills: a conjecture for a general gauge Lie group G
M. Pepe
Physics , 2004, DOI: 10.1016/j.nuclphysbps.2004.12.036
Abstract: Svetitsky and Yaffe have argued that -- if the deconfinement phase transition of a (d+1)-dimensional Yang-Mills theory with gauge group G is second order -- it should be in the universality class of a d-dimensional scalar model symmetric under the center C(G) of G. These arguments have been investigated numerically only considering Yang-Mills theory with gauge symmetry in the G=SU(N) branch, where C(G)=Z(N). The symplectic groups Sp(N) provide another extension of SU(2)=Sp(1) to general N and they all have the same center Z(2). Hence, in contrast to the SU(N) case, Sp(N) Yang-Mills theory allows to study the relevance of the group size on the order of the deconfinement phase transition keeping the available universality class fixed. Using lattice simulations, we present numerical results for the deconfinement phase transition in Sp(2) and Sp(3) Yang-Mills theories both in (2+1)d and (3+1)d. We then make a conjecture on the order of the deconfinement phase transition in Yang-Mills theories with general Lie groups SU(N), SO(N), Sp(N) and with exceptional groups G(2), F(4), E(6), E(7), E(8). Numerical results for G(2) Yang-Mills theory at finite temperature in (3+1)d are also presented.
String effects in Yang-Mills theory
M. Pepe
Physics , 2010,
Abstract: We study some features of the confining string connecting a quark-anti-quark pair in Yang-Mills theory. Monte Carlo investigations of the flux tube between two static quarks in the fundamental representation show that its thickness increases with the separation of the sources. The collected numerical data in (2+1)-d SU(2) Yang-Mills theory are in very good quantitative agreement with the next-to-leading order formula derived from the systematic low-energy effective theory of the confining string. At zero temperature, we observe the predicted logarithmic broadening. At finite and low temperature, the flux tube thickness is expected to broaden linearly. We also verify that prediction, finding an excellent agreement with the analytic expression. No adjustable parameter has been used to fit the numerical data. Then we investigate the confining strings connecting color sources in larger representations of the gauge group. Concerning stable strings -- the k-strings -- we study the Luscher term of the fundamental string and of the 2-string in (2+1)-d SU(4) Yang-Mills theory. We find that, at large separation between the two static sources, the coefficient of the Luscher term of the 2-string appraoches the value -pi/24. However, at intermediate distances, there are relevant deviations. This result may suggest that, for SU(N) at large N, a different intermediate string regime could set in. For unstable strings, in (2+1)-d SU(2) Yang-Mills theory we investigate the decay between two different string states and the multiple decays of the confining string connecting color sources in large representations. The multiple decays result from the progressive partial screening of the color sources.
On Sontag's Formula for the Input-to-State Practical Stabilization of Retarded Control-Affine Systems
Pierdomenico Pepe
Mathematics , 2012,
Abstract: In this paper input-to-state practically stabilizing control laws for retarded, control-affine, nonlinear systems with actuator disturbance are investigated. The developed methodology is based on the Arstein's theory of control Liapunov functions and related Sontag's formula, extended to retarded systems. If the actuator disturbance is bounded, then the controller yields the solution of the closed-loop system to achieve an arbitrarily fixed neighborhood of the origin, by increasing a control tuning parameter. The considered systems can present an arbitrary number of discrete as well as distributed time-delays, of any size, as long as they are constant and, in general, known.

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