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- Federico Zullo
- Entropy
- 2016

Abstract: The evolution of the entropy production in solids due to heat transfer is usually associated with the Prigogine’s minimum entropy production principle. In this paper, we propose a critical review of the results of Prigogine and some comments on the succeeding literature. We suggest a characterization of the evolution of the entropy production of… (More)

- Orlando Ragnisco, Federico Zullo
- 2010

We construct Bäcklund transformations (BTs) for the Kirchhoff top by taking advantage of the common algebraic Poisson structure between this system and the sl(2) trigonometric Gaudin model. Our BTs are integrable maps providing an exact timediscretization of the system, inasmuch as they preserve both its Poisson structure and its invariants. Moreover, in… (More)

- Orlando Ragnisco, Federico Zullo
- 2006

The Hamiltonian structure of the Classical Heisenberg Spin Chain (CHSC) has been extensively studied by a number of authors. First of all, we mention Faddeev and Thaktadjan that, in their fundamental monograph ”Hamiltonian Methods in the Theory of Soliton”, elucidate the main properties of both continuous and (semi-)discrete models. An analysis of the su(2)… (More)

Following the critical analysis of the concept of “sustainability”, developed on the basis of exergy considerations in previous works, an analysis of possible species “behavior” is presented and discussed in this paper. Once more, we make use of one single axiom: that resource consumption (material and immaterial) can be quantified solely in terms of exergy… (More)

- Enrico Sciubba, Federico Zullo
- Entropy
- 2017

The paper addresses the problem of the existence and quantification of the exergy of non-equilibrium systems. Assuming that both energy and exergy are a priori concepts, the Gibbs “available energy” A is calculated for arbitrary temperature or concentration distributions across the body, with an accuracy that depends only on the information one has of the… (More)

- Gaudin Magnet, Orlando RAGNISCO, Federico ZULLO
- 2010

We construct a Bäcklund transformation for the trigonometric classical Gaudin magnet starting from the Lax representation of the model. The Darboux dressing matrix obtained depends just on one set of variables because of the so-called spectrality property introduced by E. Sklyanin and V. Kuznetsov. In the end we mention some possibly interesting open… (More)

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