Search results for "Modelli"
showing 10 items of 1866 documents
Embryo of a Quantum Vocal Theory of Sound
2019
Concepts and formalism from acoustics are often used to exemplify quantum mechanics. Conversely, quantum mechanics could be used to achieve a new perspective on acoustics, as shown by Gabor studies. Here, we focus in particular on the study of human voice, considered as a probe to investigate the world of sounds. We present a theoretical framework that is based on observables of vocal production, and on some measurement apparati that can be used both for analysis and synthesis. In analogy to the description of spin states of a particle, the quantum-mechanical formalism is used to describe the relations between the fundamental states associated with phonetic labels such as phonation, turbule…
Computational modelling of brittle failure in polycrystalline materials using cohesive-frictional grain-boundary elements
2014
A 3D grain-level formulation for the study of brittle failure in polycrystalline microstructures is presented. The microstructure is represented as a Voronoi tessellation and the boundary element method is used to model each crystal of the aggregate. The continuity of the aggregate is enforced through suitable conditions at the intergranular interfaces. The grain-boundary model takes into account the onset and evolution of damage by means of an irreversible linear cohesive law, able to address mixed-mode failure conditions. Upon interface failure, a non-linear frictional contact analysis is introduced for addressing the contact between micro-crack surfaces. An incremental-iterative algorith…
Dynamic Preisach hystersis model for magnetostrictive materials for energy application
2013
Recently Magnetostrictive materials have been proposed as active materials to be used in several energy harvesting technology [1]. In this kind of application, the working condition of the material is highly dynamic and non linear. As a result static models of magnetostrictive materials are usually not very accurate and can be not reliable to develop a sufficiently accurate designof the energy harvesting devices. The presence of hysteresis requires accurate mathematical modeling in order to correctly foresee the behavior of real materials (ferromagnetic or magnetostrictive) used in control systems or in electrical machines and thus simplifying the design of such controllers or predicting wi…
Analisi e modelli predittivi di sistemi energetici a scala regionale, provinciale e locale: studi sperimentali, modellazione e analisi parametrica.
Il lavoro ha affrontato differenti ambiti tipici della pianificazione energetica, dell’analisi di dati e dei modelli predittivi. Tutti i predetti temi sono coniugati al fine di studiare le caratteristiche dei sistemi energetici, i bilanci energetici a scala regionale e locale, di valutare gli indicatori di efficienza dei sistemi su macro area utilizzando metodi statistici e previsionali. A tal fine sono stati applicati modelli e software predittivi basati su metodi di regressione e/o Neural Network per la predisposizione di scenari energetici a breve, medio e lungo termine. Nel complesso, il lavoro ha riguardato l’implementazione ed analisi di modelli numerici, in grado di determinare in ma…
Dynamic simulation of a 4th Generation District Heating network with the presence of prosumers
2022
District Heating Network is identified as a promising technology for the decarbonization of urban areas. Thanks to the surplus of heat available from distributed renewable energy plants, a typical heat consumer of the network could become an energy producer during the day (typically referred to as “prosumer”). Models for thermal grids developed during the years usually assumed a centralized heat production. The increasing presence of prosumers will require accurate dynamic modeling to monitor the changes induced in the thermohydraulic variables of the network. To fill this knowledge gap, this paper aims at developing a model of a thermal grid with prosumers in TRNSYS environment. The model …
A Chemical Approach to the Modelling of Band Gap of Passive Films for Corrosion Studies
2015
Photocurrent Spectroscopy (PCS) has gained a large consideration in the last decades as in situ technique for the characterization of semiconductors and photoconducting passive film/electrolyte junctions being able to provide information on the location of characteristic energy levels like: flat band potential (Ufb), internal photoemission threshold (Eth) and band gap value (Eg)
Electrochemical metallization ReRAMs (ECM) - Experiments and modelling: general discussion
2019
Electrochemical metallization ReRAMs (ECM) - Experiments and modelling: General discussion