3,657 research outputs found
Erratum: Engraftment, neuroglial transdifferentiation and behavioral recovery after complete spinal cord transection in rats (Surg Neurol Int 2018 9 :19 DOI: 10.4103/sni.sni_369_17)
No full textIn the article titled “Engraftment, neuroglial transdifferentiation and behavioral recovery after complete spinal cord transection in rats”, published on pages 19, Issue 1, Volume 9 of Surgical Neurology International,[1] the name of the authors is written incorrectly as The “How to cite this article” section should read correctly as “Luzzi S, Crovace AM, Lacitignola L, Valentini V, Francioso E, Rossi G, Invernici G, Galzio RJ, Crovace A”
Thermal hydraulic analysis of liquid-fueled molten salt reactors
No full textLiquid-fueled molten salt reactors (MSRs) are usually considered nonclassical reactor types because of the specific nature of the fuel, which is typically constituted by a molten fluoride salt mixture circulating in the primary circuit. The fission material (uranium and/or transuranium elements) is
dissolved in the molten salt carrier, which also acts as coolant. Thanks to the potentialities of this liquid fuel, several MSR concepts were investigated at Oak Ridge National Laboratory in the past (see http://www.energy- fromthorium.com/pdf/), and in recent years, MSRs have been the subject of renewed interest in the framework of Generation IV nuclear reactors (GIF, 2002, 2020; Serp et al., 2014; IRSN, 2015). These concepts differ mainly by neutron balance (critical or subcritical), neutron spectra (thermal, epithermal, or fast), the presence/absence of the graphite matrix as moderator, and the fuel salt chemical composition.
The physics of circulating nuclear fuels involves a strong coupling between neutronics and thermo-hydrodynamics, which would require in general the adoption of a multiphysics modeling approach (e.g., see, Luzzi et al., 2012b; Aufiero et al., 2014; Ramzy et al., 2020; Tiberga et al., 2020; Wan et al., 2020, and also Chapter 4.2, “Molten salt reactor multi-physics coupling and reduced order modeling”, as well as Chapter 25, “Dual-fluid reactor” of this book). However, in this chapter, analyses are performed assuming that the neutronic term is decoupled from fluid dynamics and appears like a heat source within the fuel/coolant molten salt. The aim is to investigate only the thermo-hydrodynamic behavior. Reference is made to a simple axial-symmetric cylindrical geometry representative of a typical graphite-moderated MSR power channel, taking into account the thermodynamic and transport properties of the molten salt as well as its local flow conditions and heat transfer. Even if this assumption simplifies the equations to be solved, the thermo-hydrodynamic behavior of the molten salt remains complex. In this context, a preliminary analytic approach (Di Marcello et al., 2008; Luzzi et al., 2010) to evaluate the temperature radial profile in both fuel and graphite is reported in Sections 6.2 and 6.3, which are intended to offer the reader a useful validation frame- work for testing more sophisticated computer codes, in view of their adoption for more realistic and complex 3-D geometry analyses.
The circulating “already molten” fuel offers positive peculiarities to be exploited in the safety approach as well as in the fuel cycle of liquid-fueled MSRs (LeBlanc, 2010; Luzzi et al., 2012a; Krepel et al., 2014; Qiu et al., 2016; Chisholm et al., 2020; Pathirana et al., 2021). For instance, the fluid nature of the fuel means that the reactor core meltdown is an irrelevant instance. Moreover, the reactor has almost no excess of nuclear reactivity, which reduces the risk of accidental reactivity insertion. On the contrary, the decay heat produced by the liquid fuel dissolved into the molten salt and distributed along a closed loop may impair the natural circulation features, leading to undesired behavior of the reactor. Actually, natural circulation in the presence of internal heat generation (IHG) is characterized by a particular dynamics that needs to be carefully studied. In this context, Section 6.4 presents a preliminary investigation of IHG effects on natural circulation with reference to the stability maps of single-phase rectangular loops
Collapse of Nuclear Reactor SG Tubes Pressurized From Outside: The Influence of Imperfections
No full textSome innovative nuclear power plant proposals consider for the design tubes of considerable thickness subjected to external pressure (e.g., steam generators tubes). The collapse of thick tubes is expected to be dominated by yielding but, because of the decreasing nature of the postcollapse evolution, interaction with buckling is likely to be significant enough to demand consideration. At the present, few studies have been carried
out both experimentally and numerically, as witnessed by the really conservative attitude that codes assume for thick tubes. A numerical investigation has been performed in this context at the Politecnico di Milano, which was originally intended as a support for requesting a relaxation of American Society of Mechanical Engineers (ASME) regulations. Actually, in 2007, ASME code case N-759 was approved, permitting significant thickness saving in the tube design. Nevertheless, the numerical investigation was pursued to assess the influence of different parameters, such as eccentricity, initial stresses, and material hardening, on the collapse of tubes with diameter to thickness ratios D/t<20. Results are thought to be useful under at least two respects: first, providing some understanding on the collapse behavior in a thickness range so far unexplored; second, giving an indication on the assumptions on which computer codes ought to be based
when numerical analyses are required
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
Las transformaciones de la Monarquía del siglo XVIII: Corte y Casas Reales de Felipe V
No full textEl análisis de la corte y, especialmente, de las casas reales de Felipe V proporciona una reconstrucción de las acciones del monarca desde sus ámbitos de actuación: el universo doméstico y político. Permite, al mismo tiempo, comprender que fueron las reformas en las casas reales las que abrieron los procesos de transformación y marcaron los criterios de prudencia política con que debían emprenderse las propias reformas. Las modificaciones en la estructura de las casas reales vinieron acompañadas de un cambio en la forma de gobierno de las mismas, lo que unido a las transformaciones en el ceremonial de la corte y a las diferentes disputas de poder que se desarrollaron en ella, posibilita entender los cambios en la propia noción de corte y la preponderancia de las casas reales en la constitución de la Monarquía. En definitiva,las reformas de las casas reales ayudan a comprender los cambios y el rumbo de las transformaciones de la Monarquía hispana de la primera mitad del siglo XVIII.Fil: Luzzi, Marcelo Armando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Ciencias Sociales y Humanidades. Universidad Nacional de Salta. Facultad de Humanidades. Instituto de Investigaciones en Ciencias Sociales y Humanidades; Argentin
Canoni «giambici» d’epoca bizantina e postbizantina. Un’‘isola’ nella produzione innografica della chiesa greca
No full textIn the first part of the paper, the author analyses the Sicilian reception of the rare innographical genre in classical style represented by the canons in Byzantine dodecasyllables, which were composed particularly by Theophanes (of Sicily?), Methodios of Syracuse, Eugenios of Palermo; instead, the second part is dedicated to the isolated, but interesting, production of «iambic» canons in post-Byzantine era at the hands of Manuel Korinthios, Nicholas Mavrocordatos, George Chrysogonos Trapezountios, Gerasimos Ioannoulis, John Hierosolymos, Antonio Rocchi
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
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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B, 23, p. 5283Zubarev, D.N., Morozov, V., Röpke, G., (1996) Statistical Mechanics of Non-Equilibrium Processes, Basic Concepts, Kinetic Theory, 1 VOL.. , Academie Verlag-Wiley VCH Berlin, GermanyZubarev, D.N., Morozov, V., Röpke, G., (1997) Statistical Mechanics of Non-Equilibrium Processes, Relaxation and Hydrodynamic Processes, 2 VOL.. , Academie Verlag-Wiley VCH Berlin, GermanyLuzzi, R., Vasconcellos, A.R., Ramos, J.G., (2002) Predictive Statistical Mechanics A Non-Equilibrium Ensemble Formalism, , Kluwer Academic Dordrecht, The Netherlands (Springer e-Books Archive)Luzzi, R., Vasconcellos, A.R., Ramos, J.G., (2006) Riv. Nuovo Cim., 29 (2), pp. 1-82Fano, U., (1957) Rev. Mod. 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Lo στρατοπεδάρχης Μουσιλίκης nella Vita Ιgnatii di Niceta David Paflagone
No full textThe article deals with the “strategos” of Sicily Mousilikes, protagonist of one of the miracula post mortem reported in the Life of the Constantinopolitan patriarch Ignatius ascribed to Niketas-David Paphlagon. The author of this article critically analyzes the assimilation, first affirmed by Michele Amari, between the above episode and a historical event which is mentioned only in an Arab source, reconstructing the career of the homonymous historical figure, who is mentioned in documentary and sigillographic sources: he suggests that this particular episode of the Ignatian Bios may be the result of a conscious slight distortion of an historical event by Niketas-David Paphlagon for his own ideological purposes
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