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showing 10 items of 8538 documents
High-Reynolds-number turbulent cavity flow using the lattice Boltzmann method
2018
We present a boundary condition scheme for the lattice Boltzmann method that has significantly improved stability for modeling turbulent flows while maintaining excellent parallel scalability. Simulations of a three-dimensional lid-driven cavity flow are found to be stable up to the unprecedented Reynolds number $\mathrm{Re}=5\ifmmode\times\else\texttimes\fi{}{10}^{4}$ for this setup. Excellent agreement with energy balance equations, computational and experimental results are shown. We quantify rises in the production of turbulence and turbulent drag, and determine peak locations of turbulent production.
Lipid Binding Controls Dimerization of the Coat Protein p24 Transmembrane Helix
2019
Abstract Coat protein (COP) I and COP II complexes are involved in the transport of proteins between the endoplasmic reticulum and the Golgi apparatus in eukaryotic cells. The formation of COP I/II complexes at membrane surfaces is an early step in vesicle formation and is mastered by p24, a type I transmembrane protein. Oligomerization of p24 monomers was suggested to be mediated and/or stabilized via interactions within the transmembrane domain, and the p24 transmembrane helix appears to selectively bind a single sphingomyelin C18:0 molecule. Furthermore, a potential cholesterol-binding sequence has also been predicted in the p24 transmembrane domain. Thus, sphingomyelin and/or cholestero…
Disciplinamiento social y vida cotidiana en la época de la confesionalización (1564-1665)
2018
Descripción del trabajo de investigación doctoral
“Voz del alumnado”: hacer de los estudiantes participantes activos y responsables en los procesos formativos activados en la escuela y en la universi…
2017
"Voce degli studenti" è un movimento pedagogico nato negli anni novanta in alcuni paesi di lingua inglese (Stati Uniti, Canada, Inghilterra e Australia). Supporta la partecipazione attiva e responsabile degli studenti ai processi di formazione attivati nella scuola e nell'università. Per includere le voci degli studenti in questi processi, gli adulti (insegnanti e amministratori) devono riconoscere i loro diritti di essere ascoltati e rispettati come persone con interessi, bisogni di apprendimento e idee che possono risolvere i problemi della didattica scolastica/universitaria, della ricerca educativa e delle politiche culturali in cui si devono prendere decisioni che li riguardano. In ques…
Le lave. Gli usi ornamentali nell'architettura storica in Sicilia
2012
L’attività vulcanica in Sicilia e nelle isole limitrofe ha nel corso dei millenni contribuito a modellare l’aspetto fisico di un vasto comprensorio, generando sconfinati giacimenti naturali di materiale lapideo impiegato fin dall’età antica nell’attività edificatoria. Relativamente all’utilizzo in architettura, va sottolineata l’ambivalenza di questo materiale chiamato nei secoli a svolgere tanto la funzione di pietra da costruzione, quanto quella di pietra ornamentale. Catania e l’intera area etnea, ma anche l’isola di Lipari, conservano le testimonianze più consistenti e significative di un ricorso ab antiquo alla pietra lavica e ai suoi derivati in architettura. Da una ricognizione compl…
Experimental Validation of Maximum Constant Boost Control and Switching Frequency Optimal for three-phase Quasi-Z-Source Converters
2020
This paper presents a modified modulation scheme for quasi-Z-Source converters, based on the Maximum Constant Boost Control (MCBC) concept and Switching Frequency Optimal (SFO) as reference signal. The effectiveness of the proposed technique is validated by comparing the obtained results (in terms of AC harmonic content and voltage stress) with those carried out from traditional modulation schemes. For this reason, a test bench has been assembled and the benefits of the SFO MCBC modulation scheme have been valuated.
Presentazione del volume L'ordinamento giudiziario. Ciclo di seminari (Palermo, marzo-maggio, 2018)
2019
Presentazione dei contributi raccolti nel volume
Few-body insights of multiquark exotic hadrons
2018
In this contribution we discuss the adequate treatment of the $4-$ and $5-$body dynamics within a constituent quark framework. We stress that the variational and Born-Oppenheimer approximations give energies rather close to the exact ones, while the diquark approximation might be rather misleading. Hall-Post inequalities provide very useful lower bounds that exclude possible stable states for some mass ratios and color wave functions.
Evaluation of the wave energy density on the Sicilian coast
2016
In this article the wave energy density of the northern Sicilian coasts is evaluated and is used to evaluate the producibility of a wave nergy converter to be installed in an area in the north west part of Sicily. In particular, the objective of the study is the evaluation of a potential installation in an area between Trapani and Palermo, which are the largest cities in the north west part of Sicily. In particular in this research, the wave energy density of Sicily has been analyzed by using an analysis of wave data carried out in a 10-year period, using the measurements of buoyant of National Wave measuring System (RON - Rete Ondametrica Nazionale). The analysis shows that the north-weste…
Wildflowers: opportunities for urban landscapes
2022
The concept of “sustainability” is also becoming of great interest in the management of ornamental and territorial greenery. The new trends in the design of green spaces are aimed both at enhancing their “natural” aspects and at researching schemes characterized by lower maintenance costs. Spontaneous vegetation represents a characteristic component of the urban environment and is always adequate to the conditions of the site in which it is located. In this context, the role of spontaneous herbaceous plants becomes fundamental and constitutes an effective response to the current demand for the defence, conservation and enhancement of biodiversity. So far, the use of spontaneous vegetation f…