265,768 research outputs found
Manuale di Buone Pratiche per i RLS in agricoltura
No full textIl presente manuale si inserisce all’interno del Progetto “RETI DI RLS PER LA PROMOZIONE DELLA SALUTE”, al fine di incentivare la disseminazione dei contenuti prodotti e come ulteriore contributo informativo.
Il progetto è finalizzato a migliorare conoscenze e competenze dei RLS e dei RLST del settore agricolo, implementando le Reti di interconnessione fra RLS, incrementando il livello delle reti esistenti e potenziando la cultura della prevenzione e della Promozione della Salute secondo i principi e i metodi dell’Igiene Occupazionale. L’obiettivo del progetto è inoltre favorire collaborazione e sinergia fra i RLS/RLST attraverso lo scambio di esperienze, buone prassi e metodologie di lavoro
Archivio digitale Petrarca in musica. Criteri di edizione dei testi poetici
No full textVengono presentati e brevemente discussi i criteri e le norme per la trascrizione dei testi petrarcheschi utilizzati da compositori cinquecenteschi, al fine di allestire l'edizione critica, pubblicata on-line, delle fonti musicali contemplate nel progetto europeo "Digital Archives for the Safeguard of European Musical Heritage", attuato nel quadro del programma "Cultura 2000" della Comunità europea in collaborazione con l'Università di Siena-Arezzo; l'Université de Tours (F) e la Katholieke Universiteit Leuven (B)
(testo di 19277 caratteri)
Il testo è visibile nel sito http://www.unisi.it/tdtc/petrarca/ad_documenti.ht
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
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
Assistenza equa a tutti i cittadini
No full textIstituiti con decreto del Presidente del Consiglio nel novembre del 2001, i LEA sono stati recepiti dalla Giunta della Regione Lombardia a partire da febbraio 2002. Vediamo nel dettaglio secondo quali criteri
El «Menologio de Basilio II» y el semestre invernal de la recensio B* del Sinaxario de Constantinopla
No full textStudio analitico (filologico e paleografico) dei testimoni manoscritti (a quelli in precedenza già noti l'autore aggiunge i codici Vaticani Barb. gr. 358 e Vat. gr. 2046), che tramandano il semestre invernale di una fra le più antiche recensioni del Sinassario di Costantinopoli, la cosiddetta recensio B*, volto a indagarne i rapporti esistenti col capostipite della recensio, il famosissimo libro miniato eseguito per Basilio II Bulgaroctono trasmesso nel ms. Vat. gr. 1613.Analytical study (philological and paleographic) of the manuscript witnesses (the author adds the Vatican codices Barb. gr. 358 and Vat gr. 2046 to those previously known), which hand down the winter semester of one of the earliest recensiones of the Synaxarion of Constantinople, the so-called B * recensio. This study aims to investigate the existing relations between these witnesses and the founder of the recensio, i.e. the famous illuminated book realized for Basil II "the Bulgar-slayer " handed on by the manuscript Vat gr. 1613
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. Phys., 93, p. 793Meijer, G.I., (2010) Science, 328, p. 318Zhang, Z.M., (2007) Nano/Microscale Heat Transfer, , McGraw Hill New York, USATzou, D.Y., (1997) Macro to Micro Scale Heat Transport, , Taylor and Francis Washington, USAChowdhury, I., Prasher, R., Lofgreen, K., Chrysler, G., Narasimhan, S., Mahajan, R., Koester, D., Venkatasubramanian, R., (2009) Nat. Nanotechnol., 4, p. 235Klein, R., (1985) Introduction to Phonon Hydrodynamic, 124. , W.E. Bron (Ed.), Nonequilibrium Phonon Dynamics, ASI Series B Plenum, New York, USASilva, C.A.B., Vasconcellos, A.R., Ramos, J.G., Luzzi, R., (2011) J. Stat. Phys., 143, p. 1020Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2013) Eur. Phys. J. B, 86, p. 200Vasconcellos, A.R., Castro, A.R.B., Silva, C.A.B., Luzzi, R., (2013), 3, p. 72106. , http://arXiv:1211.0342, AIP AdvAkhiezer, A.I., Peletminskii, S.V., (1981) Methods of Statistical Physics, , Pergamon Oxford, UKLauck, L., Vasconcellos, A.R., Luzzi, R., (1990) Physica A, 168, p. 789Vannucchi, F.S., Vasconcellos, A.R., Luzzi, R., (2009) Int. J. Mod. Phys. 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. Phys., 29, p. 74Bogoliubov, N.N., (1967) Lectures in Quantum Statistics I, Gordon and Breach, , New York, USAKlauder, J.R., Skagerstam, B.S., (1984) Coherent States, , World Scientific SingaporePines, D., (1961) The Many-Body Problem, , Benjamin New York, USAFeynman, R.P., (1972) Statistical Mechanics, , Benjamin Reading, MA, USAMadureira, J.R., Vasconcellos, A.R., Luzzi, R., Lauck, L., (1998) Phys. Rev. e, 57, p. 3637Ramos, J.G., Vasconcellos, A.R., Luzzi, R., (2000) J. Chem. Phys., 112, p. 2692Maxwell, J.C., (1867) Philos. Trans. R. Soc. (Lond.), p. 49Heims, S.P., Jaynes, E.T., (1962) Rev. Mod. Phys., 34, p. 143. , (see Appendix B in p. 164)Guyer, R.A., Krumhansl, J.A., (1966) Phys. Rev., 148, p. 766Casas-Vazquez, J., Jou, D., (2003) Rep. Prog. Phys., 66, p. 1937Luzzi, R., Vasconcellos, A.R., Casas-Vazquez, J., Jou, D., (1997) J. Chem. Phys., 107, p. 7383Luzzi, R., Vasconcellos, A.R., Casas-Vazquez, J., Jou, D., (1998) Physica A, 248, p. 111Algarte, A.C., Vasconcellos, A.R., Luzzi, R., (1992) Phys. Stat. Solidi B, p. 487Algarte, A.C., Vasconcellos, A.R., Luzzi, R., (1996) Phys. Rev. B, 54, p. 11311Ziman, J.M., (1960) Electrons and Phonons, , Clarendon Oxford, UKMingo, N., (2003) Phys. Rev. B, 68, p. 113308Family, F., Viszek, T., (1991) Eds Dynamical of Fractal Surfaces, , World Scientific SingaporeLi, D., Wu, Y., Kim, P., Shi, L., Yang, P., Majumdar, A., (2003) Appl. Phys. Lett., 83, p. 2934Asheghi, M., Leung, Y.K., Wong, S.S., Goodson, K.E., (1997) Appl. Phys. Lett., 71, p. 1798Guthy, C., Nam, C.-Y., Fischer, J.E., (2008) J. Appl. Phys., 103, p. 64319Ježowskia, A., Stachowiaka, P., Suskib, T., Krukowskib, S., Boćkowskib, M., Grzegoryb, I., Danilchenkoc, B., (2003) Phys. B: Condens. Matter, 329-333 (PART 2), p. 1531Ježowskia, A., Danilchenkoc, B.A., Boćkowskib, M., Grzegoryb, I., Krukowskib, S., Suskib, T., Paszkiewicz, T., (2003) Solid State Commun., 128, p. 69Laureto, E., Vasconcellos, A.R., Meneses, E.A., Luzzi, R., (2004) Int. J. Mod. Phys. B, 18, p. 1743Vasconcellos, A.R., Ramos, J.G., Gorenstein, A., Kleinke, M.U., Cruz, T.G.S., Luzzi, R., (2006) Int. J. Mod. Phys. B, 20, p. 4821Renyi, A., (1970) Probability Theory, , North Holland Amsterdam, The NetherlandsKapur, J.N., Kesavan, H.K., (1992) Entropy Optimization Principles with Applications, , Academic Boston, USAJaynes, E.T., (2002) Probability Theory the Logic of Science, , Cambridge University Press Cambridge, UKCox, R.T., (1961) The Algebra of Probable Inference, , John Hopkings Press Baltimore, USALuzzi, R., Vasconcellos, A.R., Ramos, J.G., (2007) Riv. Nuovo Cim., 30, pp. 95-157Rodrigues, C.G., Silva, A.A.P., Silva, C.A.B., Vasconcellos, A.R., Ramos, J.G., Luzzi, R., (2010) Braz. J. Phys., 40, p. 63Dedeurwaerdere, T., Casas Vazquez, J., Jou, D., Lebon, G., (1996) Phys. Rev. e, 53, p. 498Jou, D., Casas Vazquez, J., Madureira, J.R., Vasconcellos, A.R., Luzzi, R., (2001) J. Chem. Phys., 116, p. 1571Jou, D., Casas Vazquez, J., Madureira, J.R., Vasconcellos, A.R., Luzzi, R., (2001) Int. J. Mod. Phys. B, 15, p. 4211Landau, L.D., Lifshitz, I.F., (1959) Theory of Elasticity, , Addison-Wesley Reading, MABurnett, D., (1935) Proc. Lond. Math. Soc., 40, p. 382Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2009) Phys. Stat. Solidi B, p. 417Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (1999) Phys. Stat. Solidi B, p. 35Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2002) Braz. J. Phys., 32, p. 439Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2006) Braz. J. Phys., 36, p. 255Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2003) Appl. Phys. Lett., 82, p. 2455Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2006) J. Appl. Phys., 99, p. 73701Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2007) J. Appl. Phys., 102, p. 073714Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2010) J. Appl. Phys., 108, p. 033716Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2013) J. Appl. Phys., 113, p. 113701Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2001) J. Appl. Phys., 90, p. 1879Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2005) J. Appl. Phys., 98, p. 043702Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2006) Solid State Commun., 140, p. 135Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2007) J. Phys.: Condens. Matter, 19, p. 346214Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2009) Eur. Phys. J. B, 72, p. 67Rodrigues, C.G., Vasconcellos, A.R., Luzzi, R., (2005) J. Phys. D - Appl. Phys., 38, p. 358
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