4,284 research outputs found
Nota su un reperto protostorico da Muricelle di Luzzi (CS).
No full textPresentazione di un vaso protostorico rinvenuto in frammenti durante ricognizioni di superficie nell'areale della villa romana di Luzzi, loc. Muricelle; attribuzione a un momento iniziale del Bronzo antico
Pharmacological treatment of Intracerebral Vascular Anomalies: review of the literature and future
No full textOn The Selection Of The State Space In Nonequilibrium Thermodynamics
No full textWe address here the question of the choice and interpretation of state variables in the thermodynamical description of systems arbitrarily away from equilibrium. It is presented a discussion of the topic in the framework of informational statistical thermodynamics, an approach based on Gibbs algorithm for nonequilibrium dissipative systems, which provides mechano-statistical foundations to phenomenological theories of irreversible thermodynamics. The theory is applied in the case of a particular system consisting of the mobile carriers in a highly excited photo-injected plasma in semiconductors. The concepts and results thus obtained are tested against experimental data in time-resolved and time-integrated optical laser spectroscopy. It is shown how nonequilibrium thermodynamic variables are evidenced and measured in such experiments. 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Ultrafast Phenomena In The Photoinjected Plasma In Semiconductors
No full textWe present general considerations and a summarized discussion of the question of the very rapid relaxation processes that follow in the photoinjected plasma in semiconductors, phenomena that can be experimentally studied via ultrafast laser spectroscopy.262543552Alfano, R.R., (1984) Semiconductors Probed by Ultrafast Laser Spectroscopy, 1-2. , Academic, New YorkAlfano, R.R., (1982) Biological Events Probed by Ultrafast Laser Spectroscopy, , Academic, New YorkAlfano, R.R., Frontier of Femtosecond and Picosecond Optical Measuring Techniques (1986) New Techniques and Ideas in Quantum Measurement Theory, 480. , edited by D.M. Greenberg Annals of the New York Academy of Sciences, New YorkShank, C.V., (1984) Science, 219, p. 1027Brito Cruz, C.H., Fragnito, H.L., Fenômenos Ultra-Rápidos (1992) Notas de Física No. 3, , IFGW-UNICAMP, Campinas, São Paulo, BrasilLuzzi, R., Vasconcellos, A.R., Relaxation Processes in Nonequilibrium Semiconductor Plasma, 1, pp. 135-169. , Ref. 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Thermal conductivity in higher-order generalized hydrodynamics: characterization of nanowires of silicon and gallium nitride
No full textFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOFAPEG - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE GOIÁSCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOAn analysis of the influence of geometry and size on the thermal conductivity in semiconductors, particularized to the study in Si and GaN, is presented. This is done in the framework of a higher-order generalized hydrodynamics (HOGH) of phonons in semiconductors, driven away from equilibrium by external sources. This HOGH is derived by the method of moments from a generalized Peierls-Boltzmann kinetic equation built in the framework of a Non-Equilibrium Statistical Ensemble Formalism. We consider the case of wires (cylindrical geometry) exploring the effect of size (radius), particularly in the nanometric scale when comparison with experiment is done. Maxwell times, which are quite relevant to define the hydrodynamic movement, are evidenced and characterized. © 2014 Elsevier B.V.An analysis of the influence of geometry and size on the thermal conductivity in semiconductors, particularized to the study in Si and GaN, is presented. This is done in the framework of a higher-order generalized hydrodynamics (HOGH) of phonons in semiconductors, driven away from equilibrium by external sources. This HOGH is derived by the method of moments from a generalized Peierls-Boltzmann kinetic equation built in the framework of a Non-Equilibrium Statistical Ensemble Formalism. We consider the case of wires (cylindrical geometry) exploring the effect of size (radius), particularly in the nanometric scale when comparison with experiment is done. Maxwell times, which are quite relevant to define the hydrodynamic movement, are evidenced and characterized.605058FAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOFAPEG - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE GOIÁSCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOFAPEG - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE GOIÁSCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOSem informaçãoSem informaçãoSem informaçãoCastelvecchi, D., Collins, G.P., Fischetti, M., Mirsky, S., Moyer, M., Musser, G., Soares, C., Wong, K., (2010) Scientific American, 302, pp. 68-73Cahill, D.G., Ford, W.K., Goodson, K.E., Mahan, G.D., Majumdar, A., Maris, H.J., Merlin, R., Phillpot, S.R., (2003) J. Appl. 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Ontology and collaborative knowledge environment in Digital Humanities: the Cardano Case
No full textThe paper exposes the web application of Reperio, a collaborative knowledge environment for
Digital Humanities and Science, in Cardano's work
Un canone «giambico» per Basilio di Cesarea e la circoncisione del Signore e il suo raffinato acrostico tetrastico fra critica filologico-letteraria e teologia
No full textDespite the criticism expressed by its first editor (Antonio Rocchi), the anonymous “iambic” canon for 1 January (feasts of the Circumcision of the Lord and of Basil of Caesarea) seems to be one of the best Byzantine liturgical hymns written in dodecasyllables. In this paper, after dealing with the manuscript tradition of the canon (of which Rocchi knew only one defective witness), the author analyzes its refined tetrastich acrostic, consisting in a couple of elegiac distichs formed by the initials of all the lines of the hymn, and discusses its uncertain authorship
Status quaestionis sui Sinassari italogreci
No full textITA: elenco «ragionato» dei Sinassari italogreci sinora individuati (alcuni dei quali "scoperti" dall'autore) appartenenti alle recensioni B*, C* e F* del libro liturgico costantinopolitano, con la proposta di un'innovativa ipotesi di ricostruzione della sua penetrazione in Italia meridionale. Di tutti i testimoni presi in considerazione viene offerta una sintetica descrizione paleografica e testuale. ENG: reasoned list of italo-greek Synaxaria identified so far (some of which "discovered" by the author) belonging to the recensiones B*, C* and F* of the Constantinopolitan liturgical book, with the proposal of an innovative hypothesis for the reconstruction of its penetration in Southern Italy. The author gives a brief paleographic and textual description of all the witnesses taken into account
Derivation In A Nonequilibrium Ensemble Formalism Of A Far-reaching Generalization Of A Quantum Boltzmann Theory
No full textWithin the framework of the nonequilibrium statistical ensemble formalism provided by the nonequilibrium statistical operator method, we derive a quantum Boltzmann-style transport theory of a broad scope. This is done by choosing the single- and two-particle dynamical density operators as the basic informational-statistical variables. The equations of evolution for their average values over the nonequilibrium ensemble, the nonequilibrium-reduced Dirac-Landau-Bogoliubov-type density matrices, are obtained. From the resulting generalized nonlinear quantum transport theory, after resorting to perturbative-like expansions, a far-reaching generalization of Boltzmann equation for the single-particle distribution function is derived. A type of traditional Boltzmann equation follows after using stringent approximations, whose limits of validity are evaluated.2841140160Lebowitz, L.L., Montroll, E.W., (1983) Studies in Statistical Mechanics X. Nonequilibrium Phenomena I: the Boltzmann Equation, , North-Holland, AmsterdamJaynes, E.T., (1986) Frontiers of Nonequilibrium Statistical Physics, pp. 33-55. , G.T. Moore, M.O. Scully (Eds.), Plenum, New YorkLuzzi, R., Vasconcellos, A.R., (1990) Fortschr. Phys./Prog. Phys., 38, p. 887Luzzi, R., Vasconcellos, A.R., Ramos, J.G., A Non-equilibrium Statistical Ensemble Formalism: Basic Concepts, Construction, Application, Open Questions and Criticism, , http://xxx.lanl.gov/cond-mat/9909160Zubarev, D.N., (1974) Nonequilibrium Statistical Thermodynamics, Consultants Bureau, , New York, Neravnovesnaia Statisticheskaia Termodinamika, Izd. Nauka, Moscow, 1971Zubarev, D.N., (1970) Fortschr. Phys./Prog. Phys., 18, p. 125Zubarev, D.N., Morozov, V.N., Röpke, G., (1996) Statistical Mechanics of Nonequilibrium Processes, Vol. 1: Basic Concepts, Kinetic Theory, 1. , Akademie Verlag, BerlinZubarev, D.N., Morosov, V., Röpke, G., (1997) Statistical Mechanics of Nonequilibrium Processes Vol. 2: Relaxation and Hydrodynamic Processes, 2. , Akademie Verlag, BerlinAlgarte, A.C., Vasconcellos, A.R., (1992) R. Luzzi, Phys. Stat. Sol. (B), 173, p. 487Mesquita, M.V., Vasconcellos, A.R., Luzzi, R., (1998) Phys. Rev. Lett., 80, p. 2008Madureira, J.R., Vasconcellos, A.R., Luzzi, R., (1998) J. Chem. Phys., 108, p. 7568Madureira, J.R., Vasconcellos, A.R., Luzzi, R., Casas-Vázquez, J., Jou, D., (1998) J. Chem. Phys., 108, p. 7580Bogoliubov, N.N., (1967) Lectures in Quantum Statistics, 1-2. , Gordon and Breach, New York respectivelyFano, U., (1957) Rev. Mod. Phys., 29, p. 74Lauck, L., Vasconcellos, A.R., Luzzi, R., (1990) Physica A, 168, p. 789Akhiezer, A.I., Peletminskii, S.V., (1981) Methods of Statistical Physics, , Pergamon, OxfordLuzzi, R., Vasconcellos, A.R., Ramos, J.G., Foundations of a nonequilibrium ensemble formalism Fundamental Theories of Physics Series, , A. van. der Merwe (Ed.), Kluwer Academic, Dordrecht, forthcomingBogoliubov, N.N., (1962) Studies in Statistical Mechanics I, , J. de Boer, G.E. Uhlenbeck (Eds.), North-Holland, AmsterdamLuzzi, R., Vasconcellos, A.R., Ramos, J.G., Statistical foundations of irreversible thermodynamics Texte Zur Physik Series, , W. Ebeling (Ed.), Teubner, Leipzig, in pressTenan, M.A., Vasconcellos, A.R., Luzzi, R., (1997) Forstchr. Phys./Prog. Phys., 47, p. 1Luzzi, R., Vasconcellos, A.R., Ramos, J.G., (1999) Fortschr. Phys./Prog. Phys., 47, p. 401Madureira, J., Vasconcellos, A., Luzzi, R., Lauck, L., (1998) Phys. Rev. E, 57, p. 3637Vasconcellos, A.R., Algarte, A.C., Luzzi, R., (1990) Physica A, 166, p. 517Huang, K., (1963) Statistical Mechanics, , Wiley, New York, 2nd enlarged Edition, 1987Kreuzer, H.J., (1981) Nonequilibrium Thermodynamics and Its Statistical Foundations, , Clarendon, OxfordLiboff, R.L., (1990) Kinetic Theory, , Prentice-Hall, Englewood Cliffs, NJBalescu, R., (1975) Equilibrium and Nonequilibrium Statistical Mechanics, , Wiley-Interscience, New YorkHeims, S.P., Jaynes, E.T., (1962) Rev. Mod. Phys., 34, p. 143. , subsection b, pp. 148-150, and Appendix B, p. 164. (It should be noticed a misprint in the third line of their Eq. (B.1) which must end in xn-1)Ramos, J.G., Vasconcellos, A.R., Garcia-Colin, L.S., (1997) Braz. J. Phys., 27, p. 585Zwanzig, R., (1981) Perspectives in Statistical Physics, pp. 123-124. , H.J. Raveché (Ed.), North-Holland, AmsterdamVasconcellos, A.R., Algarte, A.C., Luzzi, R., (1996) Braz. J. Phys., 26, p. 543Vasconcellos, A.R., Luzzi, R., Garcia-Colin, L.S., (1991) Phys. Rev. A, 43, p. 6633Vasconcellos, A.R., Luzzi, R., Garcia-Colin, L.S., (1995) Physica A, 221, p. 495Luzzi, R., Vasconcellos, A.R., Esperidião, A.S., (1995) Phys. Rev. B, 52, p. 5021Vasconcellos, A.R., Luzzi, R., Jou, D., Casas-Vázquez, J., (1995) Phys. Rev. B, 52, p. 5030Lauck, L., Vasconcellos, A.R., Luzzi, R., (1992) Phys. Rev. B, 46, p. 615
OpenFOAM-informed TRANSURANUS simulations for assessing the fuel pin performance in the MYRRHA in-pile test section
No full textIn continuation of previous examinations of the MYRRHA fuel pin performance conducted by Magni et al. (2023) and Luzzi et al. (2024), the present work aims to investigate the impact of the beam power jump (BPJ) transient scenario on the thermo-mechanical response of homogeneous Am-bearing fuel pin (0.49 wt.% - 5 wt.%) irradiated in the in-pile test section (IPS) of the MYRRHA research reactor (core design revision 1.8). The approach pursued in the current work consists of carrying out the pin performance analysis employing the TRANSURANUS fuel performance code informed by more specific and reliable thermo-hydraulic boundary conditions evaluated via the fluid dynamics code OpenFOAM. After illustrating the differences between the conventional approach with TRANSURANUS stand-alone and the approach adopted in this paper, compliance with safety-related limits is discussed with a focus on the transient pin behaviour. The results confirm that Am-MOX fuel options for MYRRHA are suitable and safe, even during the BPJ transient, with wide margins. The adopted approach (namely, complementing the fuel performance code thermo-mechanical analysis with high-fidelity thermo-hydraulic tools) is herein applied to a specific reactor design and irradiation scenario, but it is suitable for the assessment and safety analysis of other/future reactor concepts
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