Search results for "device"

showing 10 items of 1286 documents

The set of conjugacy class sizes of a finite group does not determine its solvability

2014

Abstract We find a pair of groups, one solvable and the other non-solvable, with the same set of conjugacy class sizes.

Set (abstract data type)Discrete mathematicsMathematics::Group TheoryFinite groupTheoryofComputation_MATHEMATICALLOGICANDFORMALLANGUAGESTheoryofComputation_COMPUTATIONBYABSTRACTDEVICESAlgebra and Number TheoryConjugacy classTheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITYComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATIONMathematicsofComputing_DISCRETEMATHEMATICSMathematicsJournal of Algebra
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Applicazione di Tecniche non distruttive per la valutazione delle proprietà fisico-meccaniche dei frutti

2017

Negli ultimi decenni, la richiesta e il consumo crescente di prodotti alimentari di qualità hanno motivato la ricerca e lo sviluppo di nuove soluzioni tecnologiche in campo agroalimentare. L’applicazione di metodi e sistemi tecnologicamente avanzati ha garantito il raggiungimento, lungo tutta la filiera, di elevati standard di qualità e di sicurezza degli alimenti. In campo ortofrutticolo è di fondamentale importanza, soprattutto nella fase di postraccolta, monitorare lo stato di salute dei prodotti deperibili trasportati poiché diversi fattori influenzano le caratteristiche organolettiche e nutrizionali dei prodotti. Oltre alle tecniche di spettroscopia NIR, il cui utilizzo nel settore nel…

Settore AGR/03 - Arboricoltura Generale E Coltivazioni ArboreeSpettroscopia NIR IRD (Impact Record Device)
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Guarding net effects on landings and discards in Mediterranean trammel net fishery: Case analysis of Egadi Islands Marine Protected Area (Central Med…

2023

Discards remain among the main negative impacts of fishing activities, and their reductions are strengthened by the European Common Fisheries Policy (European Regulation 1380/2013). Trammel net fisheries appear more sustainable compared with other fishing techniques, especially from an ecological viewpoint. Despite this, reports show that trammel net fisheries deliver discard quantities between 10% and 43% of the total catch biomass. To supplement existing information, this current work attempts to address the discard reduction using guarding net in the small-scale fisheries of Egadi Islands MPA (Western Sicily, Central Mediterranean Sea). To assess the reduction of unwanted catches, 48 exp…

Settore BIO/07 - EcologiaGlobal and Planetary Changebenthic assemblagesby-catch reduction devicebenthic assemblagediscardSettore BIO/05 - ZoologiaconservationOcean EngineeringAquatic SciencesustainabilityOceanographyunwanted catchesmultivariate analysisunwanted catchemultivariate analysiWater Science and TechnologyFrontiers in Marine Science
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NEW GENERATION OF BIOCOMPATIBLE GRAFT COPOLYMERS FOR THE PRODUCTION OF NANODEVICES

2009

Settore CHIM/09 - Farmaceutico Tecnologico Applicativobiocompatible copolymers nanodevices
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Exploring Historical Scientific Instruments by Using Mobile Media Devices

2022

We describe an educational activity that can be completed with mobile media devices in order to understand the working principle of a pair of tuning forks, from the Historical Collection of Physics Instruments of the University of Palermo, and how they were used to explain acoustic interference and beats with the Lissajous optical method. This approach can be used with any tuning fork and it is a valuable teaching strategy that does not require specific laboratory equipment.

Settore FIS/08 - Didattica E Storia Della FisicaGeneral Physics and AstronomyEducationPhysics Education History of Physics Mobile media devices Museum of Physics Instruments of Acoustics
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Efficiency of Wave Energy Converters off the Sicilian Channel

2019

This paper presents a preliminary analysis on efficiency of wave energy converters off the Sicilian Channel (Italy) carried out using the SNL-SWAN spectral model (”Sandia National Laboratories – Simulating WAves Nearshore”). This open source numerical code makes possible to calculate the power extracted from wave energy converter (WEC) devices, arranged in arrays. The WEC arrays were located parallel to the coastline, near the 20 m bathymetric isoline. Three devices were tested: Pelamis, Wave Dragon and Oyster 2; one of the input data of the numerical model is the WEC power matrix, expressed as a function of the wave height and period. This matrix was determined experimentally by the protot…

Settore ICAR/02 - Costruzioni Idrauliche E Marittime E Idrologiawave energy power matrix WEC devices coastal defence Sicilian Channel
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Variable Friction Dampers (VFD) for a modulated mitigation of the seismic response of framed structures: Characteristics and design criteria

2022

In this paper a new approach for the energy dissipation is discussed based on the use of Variable Friction Dampers (VFDs). The VFD device is borrowed from braking systems mechanical engineering, able to modulate its capability of dissipation, providing a constant pure friction force coupled with an additional (variable) damping force with the increasing of the displacement. Resorting to a previous study, the characteristics and the efficiency of the “braking” system in terms of reduction of the displacements and the restoring forces is described for SDOF systems under seismic excitations and compared with the performances achievable by classic constant friction dampers (CFDs). Then, a desig…

Settore ICAR/09 - Tecnica Delle CostruzioniSettore ING-IND/31 - ElettrotecnicaNuclear Energy and EngineeringMechanical EngineeringAerospace EngineeringOcean EngineeringStatistical and Nonlinear PhysicsCondensed Matter PhysicsDissipative systems Seismic energy dissipation Structural dynamics Variable friction dissipative deviceCivil and Structural EngineeringProbabilistic Engineering Mechanics
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STUDIO DI UNA FRIZIONE MAGNETOREOLOGICA PER AUTOVEICOLI

2013

Dopo un’accurata ricerca bibliografica sui fluidi magnetoreologici, il loro comportamento ed impiego, si è passati alla progettazione di una frizione magnetoreologica per autoveicoli. Considerando le caratteristiche di coppia trasmessa e potenza, il dispositivo è stato dimensionato tenendo presente i vincoli di ingombro del veicolo preso in esame. Sottoponendo il dispositivo ad analisi magnetostatica agli elementi finiti, si è determinato l’andamento delle linee di flusso del campo magnetico nel meato di fluido e nelle zone di maggior interesse, calcolando la coppia teoricamente trasmessa dall’innesto.È stato anche eseguito il confronto delle prestazionifra una frizione MR ed una frizione t…

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineAfter a thorough literature search on magnetorheological fluids their behavior and use it has gone to the design of a magnetorheological clutch for motor vehicles. Considering the characteristics of transmitted torque and power the device is dimensioned taking into account the constraints of space of the examined vehicle. Subjecting the device to magnetostatic finite element analysis it was determined the trend of the flow lines of the magnetic field in the gap of fluid and in areas of greater interest calculating the torque transmitted theoretically by the clutch. The performance comparison between a traditional clutch and a MR clutch was also performed pointing out that the MR clutch presents shorter response times with high energy savings. The study carried out shows that the device is well suited to a vehicle with automatic or robotic or otherwise with very short response times but requires a control system for the starting the vehicle.
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STUDIO DI UN AMMORTIZZATORE ELETTROMAGNETICO A RECUPERO DI ENERGIA

2013

Questo lavoro ha come obiettivo principale lo studio teorico e con supporto di software F.E.M. di un dispositivo che consenta recupero energetico da una sospensione automobilistica. In sostituzione allo smorzatore viscoso, che dissipa l’energia cinetica del veicolo a seguito dell’attraversamento di strade sconnesse o ostacoli più marcati, si è usato uno smorzatore elettromagnetico che svolga le funzioni dello smorzatore viscoso consentendo un recupero di energia elettrica. Lo smorzatore elettromagnetico è di tipo a magneti permanenti e il suo funzionamento si basa sul fenomeno dell’induzione elettromagnetica. Il modello matematico descrive il funzionamento dello smorzatore, restituendo i va…

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineMain objective of this work is the theoretical study and support of FEM software of a device that allows for energy recovery from an automotive suspension. In replacing the viscous damper which dissipates the kinetic energy of the vehicle due to rough roads or obstacles more marked an electromagnetic damper is used that performs the functions of the viscous damper allowing a recovery of electricity. The damper is of the electromagnetic type with permanent magnets and its operation is based on the phenomenon of electromagnetic induction. The mathematical model describes the operation of the damper restoring the values of the electrical and mechanical magnitudes as a function of the relative speed between the rod and the stator. Energy recovery has been estimated considering an electric minicar that transits on a bumpy road. The recovered power has a total value of about 250W.
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Electrochemical fabrication of amorphous TiO2/Poly-3,4 Ethylenedioxythiophene (PEDOT) hybrid structures for electronic devices.

2013

Settore ING-IND/23 - Chimica Fisica ApplicataElectrochemical fabrication amorphous TiO2/Poly-34 Ethylenedioxythiophene (PEDOT) hybrid structures electronic devices
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