IMT Institutional Repository: No conditions. Results ordered -Date Deposited. 2024-03-28T16:00:46ZEPrintshttp://eprints.imtlucca.it/images/logowhite.pnghttp://eprints.imtlucca.it/2018-03-12T10:49:15Z2018-03-12T10:49:15Zhttp://eprints.imtlucca.it/id/eprint/4053This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/40532018-03-12T10:49:15ZUno strumento per l'analisi del bilancio consolidatoNicola Lattanzinicola.lattanzi@imtlucca.it2018-03-12T10:45:30Z2018-03-12T10:45:30Zhttp://eprints.imtlucca.it/id/eprint/4052This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/40522018-03-12T10:45:30ZThe measurement of the internal transactions and the strategic choices within the group of companiesDiscussion and analysis regarding the possibile trade off between single company interest and the group of companies strategic decisions.Mauro ZavaniNicola Latazinicola.lattanzi@imtlucca.it2018-03-12T10:42:07Z2018-03-12T10:42:07Zhttp://eprints.imtlucca.it/id/eprint/4051This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/40512018-03-12T10:42:07ZL'area delle relazioni esterne. Possibili fattori di sviluppo aziendaleIl contributo tratta del significato e dell'importanza crescente delle relazioni aziendali esterne nel governo economico e ne propone una lettura organica da prospettive differentiNicola Lattanzinicola.lattanzi@imtlucca.itMauro Zavani2018-03-12T10:35:34Z2018-03-12T10:35:34Zhttp://eprints.imtlucca.it/id/eprint/4050This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/40502018-03-12T10:35:34ZCollegamenti tra supporti automatici ed ipotesi dottrinaliIl contributo tratta della possibilità di compenetrare e collegare mediante linguaggi di programmazioni, supporti automatici, automazione e ipotesi economico aziendali di funzionamento.Nicola Lattanzinicola.lattanzi@imtlucca.it2018-03-12T10:32:46Z2018-03-12T10:32:46Zhttp://eprints.imtlucca.it/id/eprint/4049This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/40492018-03-12T10:32:46ZIl rapporto azienda bancaria-cliente: analisi di un cambiamentoNicola Lattanzinicola.lattanzi@imtlucca.it2012-02-24T13:39:36Z2012-02-24T13:39:36Zhttp://eprints.imtlucca.it/id/eprint/1178This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/11782012-02-24T13:39:36ZRandomly pinned landscape evolutionA simple scheme for the evolution of a fluvial landscape in heterogeneous environments is critically examined to capture the essential mechanism responsible for the recurrent scale-free landforms in the river basin. It is shown that, regardless of boundary and initial conditions, geomorphological constraints in the form of quenched randomly pinned regions play a key role in the robust emergence of aggregation patterns with a scaling behavior in agreement with that of real river basins. Guido Caldarelliguido.caldarelli@imtlucca.itAchille GiacomettiAmos MaritanIgnacio Rodriguez-IturbeAndrea Rinaldo2012-02-24T13:19:35Z2012-02-27T15:00:59Zhttp://eprints.imtlucca.it/id/eprint/1177This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/11772012-02-24T13:19:35ZSurface effects in invasion percolationBoundary effects for invasion percolation are introduced and discussed here. The presence of boundaries determines a set of critical exponents characteristic of the boundary. In this paper we present numerical simulations showing a remarkably different fractal dimension for the region of the percolating cluster near the boundary. In fact, near the surface we find a value of $D^{sur}=1.65\pm 0.02$,(for IP with trapping $D_{tr}^{sur}=1.59\pm 0.03$), compared with the bulk value of $D_{sur}=1.88\pm 0.02$ ($D_{tr}^{sur}=1.85\pm 0.02$). We find a logarithmic
crossover from surface to bulk fractal properties, as one would expect from the finite-size theory
of critical systems. The distribution of the quenched variables on the growing interface near
the boundary self-organizes into an asymptotic shape characterized by a discontinuity at a value $x_c=0.5$, which coincides with the bulk critical threshold. The exponent $\tau^{sur}$ of the boundary
avalanche distribution for IP without trapping is $\tau^{sur}=1.56\pm 0.05$; this value is very near
to the bulk one. Then we conclude that only the geometrical properties (fractal dimension) of
the model are affected by the presence of a boundary, while other statistical and dynamical
properties are unchanged. Furthermore, we are able to present a theoretical computation of the
relevant critical exponents near the boundary. This analysis combines two recently introduced
theoretical tools, the fixed scale transformation and the run time statistics, which are particularly
suited for the study of irreversible self-organized growth models with quenched disorder. Our
theoretical results are in rather good agreement with numerical data. Raffaele CafieroGuido Caldarelliguido.caldarelli@imtlucca.itAndrea Gabrielli2012-02-24T13:15:33Z2012-02-24T13:15:33Zhttp://eprints.imtlucca.it/id/eprint/1176This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/11762012-02-24T13:15:33ZScaling in currency exchangeWe study the scaling behavior in currency exchange rates. Our results suggest that they satisfy scaling with an exponent close to 0.5, but that it differs qualitatively from that of a simple random walk. Indeed price variations cannot be considered as independent variables and subtle correlations are present. Furthermore, we introduce a novel statistical analysis for economic data which makes the physical properties of a signal more evident and eliminates the systematic effects of time periodicity.Stefano GalluccioGuido Caldarelliguido.caldarelli@imtlucca.itMatteo MarsiliYi-Cheng Zhang2012-02-24T13:11:10Z2013-11-20T13:15:01Zhttp://eprints.imtlucca.it/id/eprint/1175This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/11752012-02-24T13:11:10ZA prototype model of stock exchangeA prototype model of stock market is introduced and studied numerically. In this self-organized system, we consider only the interaction among traders without external influences. Agents trade according to their own strategy, to accumulate their assets by speculating on the price's fluctuations which are produced by themselves. The model reproduced rather realistic price histories whose statistical properties are also similar to those observed in real markets.Guido Caldarelliguido.caldarelli@imtlucca.itMatteo MarsiliYi-Cheng Zhang2012-01-19T10:38:13Z2012-01-19T10:38:13Zhttp://eprints.imtlucca.it/id/eprint/1064This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/10642012-01-19T10:38:13ZThe evolution of knowledge and the dynamics of an industry network The paper moves a step forward in the direction of establishing a connection between the structure and evolution of knowledge bases and the structure and evolution of organizational forms in innovative activities in a science-intensive industry. The paper has an explicit focus on the dynamics of the network of collaborative agreements in R&D in the pharma/biotech industry after the “molecular biology revolution”. Using a comprehensive dataset, built by the authors integrating several sources in the industry, the dynamics of the network over time is extensively analyzed. With regards to network structure, it is found that, while the size of the network increases over time due to net flows of entry, its topological properties remain relatively unchanged. The evolution of the network has occurred without relevant deformations in the core-periphery profile. With regards to age-dependent propensity to collaborate, the paper finds that the extent of inter-generational collaboration is much more significant than intra-generational collaboration. In addition, the propensity of firms of a given generation to enter into collaboration with firms of a different generation increases with the distance between the two, while the total number of intra-generational collaborations decreases over time and, moreover, tends to decrease for most recent generations. In the paper a unitary and coherent explanation of the evidence is developed, coming to reveal the existence of a striking isomorphism between structural properties of the dynamics of knowledge and of the evolution of network structure. Luigi OrsenigoFabio Pammollif.pammolli@imtlucca.itMassimo Riccabonimassimo.riccaboni@imtlucca.itAndrea BonaccorsiGiuseppe Turchetti2011-09-15T08:57:46Z2014-12-02T09:53:27Zhttp://eprints.imtlucca.it/id/eprint/883This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/8832011-09-15T08:57:46ZQuale arte per il tempo di Platone?Maria Luisa Catonimarialuisa.catoni@imtlucca.it2011-02-15T10:49:18Z2011-07-11T14:24:18Zhttp://eprints.imtlucca.it/id/eprint/53This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/532011-02-15T10:49:18ZKarl Popper 1902-1994Stefano Gatteistefano.gattei@imtlucca.it