http://biblioteca.universia.net/vernivel.do?nivel=2212 Mostrando recursos 1 - 20 de 203 es http://biblioteca.universia.net/img/logotipo.jpg http://biblioteca.universia.net/ http://biblioteca.universia.net/ficha.do?id=41854731 Helicity amplitudes calculations with the program PHACT are explained. Some examples of their application in WPHACT and SIXPHACT MC's are given. 1 Introduction The possibility of exploring higher and higher energies at present and future accelerators, entails the necessity of predicting and computing with high precision more and more complicated processes, with more external particles and more Feynman diagrams to be evaluated. This has lead to progressively abandon the old trace methods for p... Alessandro Ballestrero,Dip Fisica Teorica http://biblioteca.universia.net/ficha.do?id=41839985 this paper we have produced a confirmation of this suggestion (notice Jose Luis,Fisica Teorica,U. A. M. Cantoblanco Madrid http://biblioteca.universia.net/ficha.do?id=41737733 this paper will be devoted to discuss applications of the splitting lemma, and to show how it permits to unify a number of known (and, again, useful) results in equivariant dynamics and in particular in equivariant bifurcation theory. http://biblioteca.universia.net/ficha.do?id=41843189 this paper we present our interpretation of these data, with a model of deconfinement transition based on percolation theory. M. Nardi http://biblioteca.universia.net/ficha.do?id=35387960 SUMMARY Eleven-dimensional M Theory is conjectured to contain and unify quantum gravity and the rest of fundamental interactions. Despite its current lack of a precise formulation, hints and information about M Theory can be retrieved from its low energy limit, eleven-dimensional supergravity. In fact, this Thesis aims to make progress towards the understanding of M Theory by the study of eleven dimensional supergravity. Two important questions in M Theory yet to be solved are 1) how many sup... Varela Rizo, Oscar http://biblioteca.universia.net/ficha.do?id=46604467 We show, via a simple parametrization of the multiplicity distribution of charged particles in e + e \Gamma annihilation at the Z 0 peak in terms of the weighted superposition of two negative binomial distributions, that both the shoulder structure in the intermediate multiplicity range and the oscillation in sign of the ratio of factorial cumulants over factorial moments of increasing order are related to hard gluon radiation. Talk presented at the 7th International Workshop "Corr... A. Giovannini; Dip Di Fisica Teorica; S. Lupia; R. Ugoccioni http://biblioteca.universia.net/ficha.do?id=38066392 Este trabalho trata o problema genérico da obtenção analítica exata das variedades algébricas que definem domínios de estabilidade e multiestabilidade para sistemas dinâmicos dissipativos com equações de movimento definidas por funções racionais. Apresentamos um método genérico, válido para qualquer sistema dinâmico, que permite reduzir a análise de sistemas multidimensionais arbitrários à análise de um sistema unidimensional equivalente. Este método é aplicado ao mapa de Hénon, o exemplo par... Endler, Antônio http://biblioteca.universia.net/ficha.do?id=38068836 o trabalho de Krim e Windom [Phys. Rev B 38, 12184(1988)], que revelou a natureza viscosa do atrito em escala atômica, gerou uma intensa atividade tanto teórica quanto experimental. Contudo, questões fundamentais ainda se matém em aberto com opor exemplo a relação entre o coeficiente de atrito viscoso e a topologia do substrato assim como a dependência com a temperatura do substrato. Neste trabalho apresentamos os resultados, obtidos usando dinâmica molecular, para um modelo unidimensional de... Torres, Evy Augusto Salcedo http://biblioteca.universia.net/ficha.do?id=41849590 Using the cluster expansion technique, we estimate, uniformly in the volume, the difference between the quenched and annealed free energy in the high temperature phase of a d-dimensional Ising spin glass model with Bernoulli couplings. Classification P.A.C.S. 75.10, 05.50 Letters in Mathematical Physics, N. 27: 143-147, 1993 1 1. Introduction. The study of disordered models in statistical mechanics has not yet reached the stage of systematic treatment. Even physically, the systems described b... Pierluigi Contucci http://biblioteca.universia.net/ficha.do?id=37658525 - http://biblioteca.universia.net/ficha.do?id=37819048 Levich, V. G. (Veniamin Grigorevich) http://biblioteca.universia.net/ficha.do?id=45827966 Abstract. We prove that the one-dimensional random fields with finite first moment are isomorphic to Bernoulli schemes. G. Gallavotti; Istituto Di Fisica Teorica http://biblioteca.universia.net/ficha.do?id=44749831 Vásquez Rocca, Adolfo http://biblioteca.universia.net/ficha.do?id=6883213 O estudo insere-se no Programa de Pós-Graduação em Educação da Universidade Federal da Bahia na área de concentração ?Educação, sociedade e práxis pedagógica?, especificamente na linha de pesquisa ?Educação Física & Esporte e Lazer? e no Grupo LEPEL/FACED/UFBA. Tem como objeto de estudo a formação dos professores e os parâmetros teórico-metodológicos. Problematiza a formação apartir da critica as condições de oferecimento dos cursos e da produção do conhecimento cientifico sobre a temática fo... Cláudio de Lira Santos Júnior http://biblioteca.universia.net/ficha.do?id=37894148 84-291-4064-6 Levich, V. G (Veniamin Grigorevich); Vdovin, I.A.; Miamlin, V.A. http://biblioteca.universia.net/ficha.do?id=46168001 Let Sn be polynomials orthogonal with respect to the inner product (f, g)S = fg d0 + # f # g # d1 where d0 = x e -x dx, d1 = x-# dx + M # # with # > 0, and # > 0. A strong asymptotic on (0, a Mehler-Heine type formula, a Plancherel-Rotach type exterior asymptotic as well as an upper estimate for Sn are obtained. As consequence, we give asymptotic results for the zeros and critical points of Sn and the distribution of contracted zeros. Some numerical examples are shown. Manuel Alfaro; Juan J. Moreno-Balcazar; I Física; Teórica Computacional; M. Luisa Rezola; M. Luisa Rezola http://biblioteca.universia.net/ficha.do?id=47103039 The spreading of the quantum probability density for the highlyexcited states of a single-particle system with an exponential-type potential on the positive semiaxis is quantitatively determined in both position and momentum spaces by means of the Boltzmann-Shannon information entropy. This problem boils down to the calculation of the asymptotics of the entropy-like integrals of the modified Bessel function of the second kind (also called Mcdonald function or Basset function). The depe... J. S. Dehesa; I Física; Teórica Computacional; A. Martínez-finkelshtein; V. N. Sorokin http://biblioteca.universia.net/ficha.do?id=47315734 spacing Claude Bernard A; Maarten Golterman B; Yigal Shamir C; B Grup De Física Teòrica http://biblioteca.universia.net/ficha.do?id=21913847 In 1927, just after he obtained a full professorship, Enrico Fermi delivered his first course on Theoretical Physics at the Institute of Physics in Rome. The following year Edoardo Amaldi, Emilio Segre' and Ettore Majorana became students of that course. The lectures given in 1927-28, whose content may be easily reconstructed, probably had a deep impact in forming such young students, who participated actively in the Physics researches carried on in Rome soon after. In this perspective, the c... De Gregorio, A.; Esposito, S. http://biblioteca.universia.net/ficha.do?id=37850599 Tesis de Maestría en Comunicación Caballero Hoyos, José Ramiro