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Messina, Italy

The University of Messina is a public university located in Messina, Italy. Founded in 1548 by Ignatius of Loyola, it became the model for hundreds of Jesuit colleges. The university is organized in 11 Faculties. Wikipedia.

Arena F.,Messina University
Catalysis Science and Technology | Year: 2014

The pressing need to preserve the state of the environment and of natural resources imposes a global technological effort aimed at turning the current "money-making" industrial policies into sustainable development behaviour. This green revolution entails a big scientific effort for developing handy and economic technologies for the decontamination of gas and liquid wastes, improving the quality of air and water, clean industrial manufacturing, and renewable energy supply. In this context the composite MnCeOx system represents a viable alternative to high-cost noble metals for a variety of environmental catalytic applications like the detoxification treatment of industrial wastewater; the abatement of pollutants in gas exhausts; and bio-fuel and fine-chemicals synthesis and manufacture. © The Royal Society of Chemistry 2014. Source

Piccolo A.,Messina University
Applied Energy | Year: 2013

In this paper a simplified two-dimensional computational method for studying the entropy generation characteristics inside the core porous structures of a thermoacoustic refrigerator is presented. The model integrates the equations of the standard linear thermoacoustic theory into an energy balance-based numerical calculus scheme. The numerically computed spatial distributions of the time-averaged entropy generation rate within a channel of the stack and adjoining heat exchangers (HXs) evidence as the stack-HXs junctions act as strong sources of thermal irreversibility. The study also shows as, for a fixed refrigerating output level and temperature span, minimum in entropy generation can be effectively used as a suitable design criterion for optimizing simultaneously the stack length, the stack position and the plates interspacing. The same method, when applied to the optimization of the HXs, reveals that the length of the HXs along the direction of the acoustic vibration should be comprised between x1 (the amplitude of the acoustic displacement) and 2x1, the optimal value resulting an increasing function of the fin interspacing and of the drive ratio. © 2012 Elsevier Ltd. Source

Sartorel A.,CNR Institute on Membrane Technology | Bonchio M.,CNR Institute on Membrane Technology | Campagna S.,Messina University | Scandola F.,University of Ferrara
Chemical Society Reviews | Year: 2013

Among molecular water oxidation catalysts (WOCs), those featuring a reactive set of four multi-redox transition metals can leverage an extraordinary interplay of electronic and structural properties. These are of particular interest, owing to their close structural, and possibly functional, relationship to the oxygen evolving complex of natural photosynthesis. In this review, special attention is given to two classes of tetrametallic molecular WOCs: (i) M4O4 cubane-type structures stabilized by simple organic ligands, and (ii) systems in which a tetranuclear metal core is stabilized by coordination of two polyoxometalate (POM) ligands. Recent work in this rapidly evolving field is reviewed, with particular emphasis on photocatalytic aspects. Special attention is given to studies addressing the mechanistic complexity of these systems, sometimes overlooked in the rush for oxygen evolving performance. The complementary role of molecular WOCs and their relationship with bulk oxides and heterogeneous catalysis are discussed. © 2013 The Royal Society of Chemistry. Source

Fazio R.,Messina University
Computers and Fluids | Year: 2013

In this paper, we review the so-called Töpfer algorithm that allows us to find a non-iterative numerical solution of the Blasius problem, by solving a related initial value problem and applying a scaling transformation. Moreover, we remark that the applicability of this algorithm can be extended to any given problem, provided that the governing equation and the initial conditions are invariant under a scaling group of point transformations and that the asymptotic boundary condition is non-homogeneous. Then, we describe an iterative extension of Töpfer's algorithm that can be applied to a general class of problems. Finally, we solve the Falkner-Skan model, for values of the parameter where multiple solutions are admitted, and report original numerical results, in particular data related to the famous reverse flow solutions by Stewartson. The numerical data obtained by the extended algorithm are in good agreement with those obtained in previous studies. © 2013 Elsevier Ltd. Source

Bruneo D.,Messina University
IEEE Transactions on Parallel and Distributed Systems | Year: 2014

Cloud data center management is a key problem due to the numerous and heterogeneous strategies that can be applied, ranging from the VM placement to the federation with other clouds. Performance evaluation of cloud computing infrastructures is required to predict and quantify the cost-benefit of a strategy portfolio and the corresponding quality of service (QoS) experienced by users. Such analyses are not feasible by simulation or on-the-field experimentation, due to the great number of parameters that have to be investigated. In this paper, we present an analytical model, based on stochastic reward nets (SRNs), that is both scalable to model systems composed of thousands of resources and flexible to represent different policies and cloud-specific strategies. Several performance metrics are defined and evaluated to analyze the behavior of a cloud data center: utilization, availability, waiting time, and responsiveness. A resiliency analysis is also provided to take into account load bursts. Finally, a general approach is presented that, starting from the concept of system capacity, can help system managers to opportunely set the data center parameters under different working conditions. © 2014 IEEE. Source

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