Search results for " Teoria del"
showing 10 items of 453 documents
Vibronic Model for Intercommunication of Localized Spins via Itinerant Electron
2019
In this article, we propose a vibronic pseudo Jahn–Teller model for partially delocalized mixed-valence molecules aimed to describe the magnetic coupling between the localized spins mediated by the delocalized electron. The simplest partially delocalized system that retains the main studied features is assumed to consist of a one-electron mixed-valence dimer, which is connected to the two terminal magnetic ions. The model involves the following key interactions: electron transfer in the spin-delocalized subsystem of a mixed-valence molecule, which is mimicked by a dimeric unit, coupling of the itinerant electrons with the molecular vibrations, and isotropic magnetic exchange between the loc…
A Bi-objective Optimization Study of an Acid-Base Flow Battery for High Efficiency and Improved Power Density
2022
Electrical energy storage is critical for a broader penetration of renewable energies with intermittent nature, such as solar and wind energy. The Acid/Base Flow Battery (AB-FB) is a unique, sustainable, and environmental-friendly storage technology with high electrolyte solution energy density. The method relies on reversible electrodialytic technologies using bipolar membranes to transform electrical energy into chemical energy related to pH gradients and vice versa. The charge phase is accomplished by using bipolar membrane electrodialysis, whereas the discharge phase is performed via bipolar membrane reverse electrodialysis. In a previous work, we developed an advanced multi-scale proce…
Type-2 Fuzzy Control of a Bioreactor
2009
Abstract—In this paper the control of a bioprocess using an adaptive type-2 fuzzy logic controller is proposed. The process is concerned with the aerobic alcoholic fermentation for the growth of Saccharomyces Cerevisiae a n d i s characterized by nonlinearity and parameter uncertainty. Three type-2 fuzzy controllers heve been developed and tested by simulation: a simple type-2 fuzzy logic controller with 49 rules; a type-2 fuzzyneuro- predictive controller (T2FNPC); a t y p e -2 selftuning fuzzy controller ( T2STFC). The T2FNPC combines the capability of the type-2 fuzzy logic to handle uncertainties, with the ability of predictive control to predict future plant performance making use of a…
Climatology of the aerosol extinction-to-backscatter ratio from sun-photometric measurements
2010
The elastic lidar equation contains two unknown atmospheric parameters, namely, the particulate optical extinction and backscatter coefficients, which are related through the lidar ratio (i.e., the particulate-extinction-to-backscatter ratio). So far, independent inversion of the lidar signal has been carried out by means of Raman lidars (usually limited to nighttime measurements), high-spectral-resolution lidars, or scanning elastic lidars under the assumption of a homogeneously vertically stratified atmosphere. In this paper, we present a procedure to obtain the lidar ratio at 532 nm by a combined Sunphotometer– aerosol-model inversion, where the viability of the solution is largely reinf…
Aerosol Lidar Intercomparison in the Framework of SPALINET—The Spanish Lidar Network: Methodology and Results
2009
Abstract—A group of eight Spanish lidars was formed in order to extend the European Aerosol Research Lidar Network–Advanced Sustainable Observation System (EARLINET-ASOS)project. This study presents intercomparisons at the hardware and software levels. Results of the system intercomparisons are based on range-square-corrected signals in cases where the lidars viewed the same atmospheres. Comparisons were also made for aeros backscatter coefficients at 1064 nm (2 systems) and 532 nm (all systems), and for extinction coefficients at 532 nm (2 systems). In total, three field campaigns were carried out between 2006 and 2007. Comparisons were limited to the highest layer found before the free tr…
Bello e Idea nell’estetica del Seicento
2007
The Beautiful and The Idea in 17th-Century Aesthetics In his renowned lecture on the Idea, which he delivered at the Academy of Saint Luke in 1664, Giovan Pietro Bellori asserts the superiority of ideal beauty against the slavish imitation of reality and the unbridled freedom of the imagination. However, an equally important, albeit lesser known, contributor to the formulation of this classicist aesthetic theory is Giovan Battista Agucchi, author of a Treatise on Painting that appeared in fragmentary form in 1646. In this work, Agucchi identifes beauty as the truest and highest aim of painting; he attributes to the artist the power to contemplate the Idea, and confers a profound cognitive v…
Tra cielo e terra. La figura dell’artista nel Rinascimento
2012
Nella figura del genio romantico, oltre alla metafora rinascimentale dell’artista–dio (già ampiamente scandagliata), convergono anche altri modelli teorici. Uno di questi attinge alla categoria della feritas, quale dimensione sotto certi aspetti sub umana – se per misurare l’humanitas consideriamo il parametro della ratio – ma al contempo più ampia e più ricca per le suggestioni provenienti dalla sfera dei sensi, dell’istinto e della passione. In questo lavoro si cerca di delineare come la “bestializzazione”, ovvero la degenerazione dei comportamenti umani a uno stato selvatico, costituisca una chiave di lettura per mettere a fuoco le dinamiche simboliche che convergono a delineare l’identi…
Recovery of Lithium Carbonate from Dilute Li-Rich Brine via Homogenous and Heterogeneous Precipitation
2022
An extensive experimental campaign on Li recovery from relatively dilute LiCl solutions (i.e., Li+ similar to 4000 ppm) is presented to identify the best operating conditions for a Li2CO3 crystallization unit. Lithium is currently mainly produced via solar evaporation, purification, and precipitation from highly concentrated Li brines located in a few world areas. The process requires large surfaces and long times (18-24 months) to concentrate Li` up to 20,000 ppm. The present work investigates two separation routes to extract Li+ from synthetic solutions, mimicking those obtained from low-content Li+ sources through selective Li+ separation and further concentration steps: (i) addition of …
Arbitrarily shaped plates analysis via Line Element-Less Method (LEM)
2018
Abstract An innovative procedure is introduced for the analysis of arbitrarily shaped thin plates with various boundary conditions and under generic transverse loading conditions. Framed into Line Element-less Method, a truly meshfree method, this novel approach yields the solution in terms of the deflection function in a straightforward manner, without resorting to any discretization, neither in the domain nor on the boundary. Specifically, expressing the deflection function through a series expansion in terms of harmonic polynomials, it is shown that the proposed method requires only the evaluation of line integrals along the boundary parametric equation. Further, minimization of appropri…
Giovan Battista Filippo Basile e Gottfried Semper. Tangenze e confluenze nella cultura architettonica europea della seconda metà del XIX secolo
2009
Con questo saggio si cerca di dare un contributo di conoscenza su Giovan Battista Filippo Basile, architetto che ha rappresentato la figura centrale e di maggiore risonanza europea prodotta negli anni a cavallo dell’Unità d’Italia dalla cultura architettonica palermitana. Il tentativo di avvicinare l’opera teorica di Giovan Battista Filippo Basile a quella di Gottfried Semper, oltre ad evidenziare la dimensione europea del suo pensiero, consente di sottolineare l'importanza del ruolo svolto dal fondamento razionale e teorico, congiuntamente all’esame critico della società, dei suoi valori e dei suoi costumi nell'azione degli architetti; tale approccio alla disciplina fa apparire ai nostri o…