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Search Results: 1 - 10 of 345289 matches for " Fernando S;Esposito "
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Uma nova espécie de Bricelochlorops Paganelli e o primeiro registro de Urubambina rufa (Duda) (Diptera: Chloropidae) para o Brasil
Carvalho Filho, Fernando S;Esposito, Maria C;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000500012
Abstract: the subfamily chloropinae comprises about 442 described species, with only one species recorded from the brazilian amazon. the genus bricelochlorops paganelli was represented by a unique species from rio de janeiro, brazil. the species urubambina rufa (duda) is the only species of the genus urubambina paganelli and has been recorded only from peru. a new species of bricelochlorops, b. celutae sp. nov., is described here and urubambina rufa is recorded for the first time in brazil. both species were collected in the state of acre. a key to species of bricelochlorops is provided.
Neriidae (Diptera: Schizophora) of the Brazilian Amazon: new records of genera and species, and key to species
Carvalho-Filho, Fernando S.;Esposito, Maria C.;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000100008
Abstract: the present study brings together survey data from collection in several localities in the brazilian amazon and specimens from the entomological collection of museu paraense emílio goeldi (mpeg-belém). the flies were collected over organic decomposing matter (bananas and bovine meat) baits. the genus odontoloxozus enderlein, with the species odontoloxozus peruanus hennig, is recorded from brazil for the first time. the species glyphidops (glyphidops) flavipes (widemann), g. (oncopsia) flavifrons (bigot), g.(o.) durus (cresson) and g. (o.) dipsar (hennig) are new occurrences for brazil. the species g. (o.)carrerai aczél and n. plurivittatus bigot are new occurrences from brazilian amazon. a key to brazilian amazon species is provided.
Transition from Majorana to Weyl fermions and anapole moments
Esposito, S.
High Energy Physics - Phenomenology , 2013,
Abstract: The apparent splitting of zero-bias conductance peaks, apparently observed in recent experiments concerning Majorana fermions in nanowires coupled to superconductors, can be interpreted as a manifestation of a transition in the structure from (massive) Majorana to (massless) Weyl fermions. A modification of the experiments in order to test such phenomenon is proposed by making recourse to the only possible electromagnetic interaction allowed to (massive) Majorana particles and mediated by their anapole moment. In suitably designed heterostructures with toroidal symmetry, the additional anapole interaction manifests itself in the lowering of the critical magnetic field required for the appearance of the zero-bias peak, a shift that can be directly measured and thus reveal the presence of Majorana (rather than Weyl) fermions. Anapole interactions, though not previously considered, may also be a powerful method to control the dynamics of Majorana fermions, and then to manipulate the qubit state in quantum computation
An unknown story: Majorana and the Pauli-Weisskopf scalar electrodynamics
Esposito, S.
High Energy Physics - Phenomenology , 2007, DOI: 10.1002/andp.200710270
Abstract: An account is given of an interesting but unknown theory by Majorana regarding scalar quantum electrodynamics, elaborated several years before the known Pauli-Weisskopf theory. Theoretical calculations and their interpretation are given in detail, together with a general historical discussion of the main steps towards the building of a quantum field theory for electrodynamics. A possible peculiar application to nuclear constitution, as conceived around 1930, considered by Majorana is as well discussed.
Fermi at Los Alamos and the early Britain's way to nuclear energy
S. Esposito
Physics , 2008,
Abstract: A novel recovery of some important documents related to the Fermi course on neutron physics, held at Los Alamos in 1945, is announced. Its relevance for the effective launch of a British nuclear programme in the early postwar period, independently of the U.S. technical cooperation (precluded by the American authorities) and warmly supported by Chadwick, is discussed.
A theory of ferromagnetism by Ettore Majorana
S. Esposito
Physics , 2008, DOI: 10.1016/j.aop.2008.07.005
Abstract: We present and analyze in detail an unknown theory of ferromagnetism developed by Ettore Majorana as early as the beginnings of 1930s, substantially different in the methods employed from the well-known Heisenberg theory of 1928 (and from later formulations by Bloch and others). Similarly to this, however, it describes successfully the main features of ferromagnetism, although the key equation for the spontaneous mean magnetization and the expression for the Curie temperature are different from those deduced in the Heisenberg theory (and in the original phenomenological Weiss theory). The theory presented here contains also a peculiar prediction for the number of nearest neighbors required to realize ferromagnetism, which avoids the corresponding arbitrary assumption made by Heisenberg on the basis of known (at that time) experimental observations. Some applications of the theory (linear chain, triangular chain, etc.) are, as well, considered.
Primordial Nucleosynthesis: accurate predictions for light element abundances
S. Esposito
Physics , 1999,
Abstract: A detailed analysis of primordial nucleosynthesis predictions for light element abundances is performed. Contents: 1. The standard cosmology: an overview. 2. Primordial nucleosynthesis. 3. The Born rates for n<->p reactions. 4. Finite nucleon mass corrections. 5. QED thermal radiative corrections. 6. Calculations of Big Bang Nucleosynthesis. Results.
Una lezione particolare di Ettore Majorana
S. Esposito
Physics , 2005,
Abstract: We give, for the first time, the critical complete text of a manuscript by Ettore Majorana, conserved in the same file of the lecture notes for his course on Theoretical Physics at the University of Naples. He probably refers to a seminar delivered in that University. Some passages reveal a physical interpretation of the Quantum Mechanics which anticipates of several years the Feynman approach in terms of path integrals, independently of the underlying mathematical formulation.
Again on Majorana and the Thomas-Fermi model: a comment to physics/0511222
S. Esposito
Physics , 2005,
Abstract: We comment on a recent paper announcing the discovery of a previously unknown publication of Ettore Majorana on the Thomas-Fermi atomic model. In pointing out that such a publication was not written by Majorana, we correct some misunderstandings and clarify the historical and scientific relevance of the "forgotten publication".
Classical $v_{gr} \neq c$ solutions of Maxwell equations and the tunneling photon effect
S. Esposito
Physics , 1996, DOI: 10.1016/S0375-9601(96)00872-9
Abstract: We propose a very simple but general method to construct solutions of Maxwell equations propagating with a group velocity $v_{gr} \neq c$. Applications to wave guides and a possible description of the known experimental evidences on photonic tunneling are discussed.
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