Search results for "armo"
showing 10 items of 1364 documents
Impact Evaluation of Innovative Selective Harmonic Mitigation Algorithm for Cascaded H-Bridge Inverter on IPMSM Drive Application
2021
This paper presents a detailed analysis of the use of a novel Harmonic Mitigation algorithm for Cascaded H-Bridge Multilevel Inverter in electrical drives for the transportation field. For this purpose, an enhanced mathematical model of Interior Permanent Magnet Synchronous Motor (IPMSM), that takes into account simultaneously saturation, cross-coupling, spatial harmonics, and iron loss effects, has been used. In detail, this model allows estimating accurately the efficiency and the torque ripple of the IPMSM, crucial parameters for transportation applications. Moreover, two traditional pulse width modulation strategies, Sinusoidal Phase-Shifted and Switching Frequency Optimal Phase-Shifted…
A Model for the Study of Sheath Currents in Medium Voltage Cables for Industrial Application
2020
In this paper, the implementation of a simulation model for studying the effect of cross-bonding of metallic sheaths and/or non-magnetic armor of single-core medium voltage cables in the same circuit is discussed. With the use of single-core cables, the resistive losses due to the induced circulating currents in cable sheaths or armors causes an increase of cable temperature that reduces its ampacity. In addition, the risk of electric shock due to induced voltages may be present if a person is exposed to the armor/sheath at the unbounded end. For this reason, special bonding techniques are used to significantly reduce these currents. The authors have implemented a model that could be used t…
PQ and Harmonic Assessment Issues on Low-Cost Smart Metering Platforms: A Case Study
2020
This paper presents a feasibility study on how to implement power quality (PQ) metrics in a low-cost smart metering platform. The study is aimed at verifying the possibility of implementing PQ monitoring in distribution networks without replacing existing smart metering devices or adding new modules for PQ measurements, thus zeroing the installation costs. To this aim, an electronic board, currently used for remote energy metering, was chosen as a case study, specifically the STCOMET platform. Starting from the specifications of this device, the possibility of implementing power quality metrics is investigated in order to verify if compliance with standard requirements for PQ instruments ca…
At the interface between sensation and emotion : perceived qualities of single chords
2017
The focus of this dissertation is to investigate the perception of single chords, both in terms of perceived emotions and psychoacoustic qualities. Previous empirical research on harmony perception has mainly been concerned with horizontal aspects of harmony: studies focusing on vertical harmony perception have been rare. The current work aims to fill some of the still evident gaps between musicology, music psychology, and psychoacoustics with regard to single chord perception by combining both empirical and theoretical approaches. The work comprises three publications, based on two large-scale empirical experiments conducted with the aim of drawing the attention of both expert and inexpert…
Johtosävelen tuolla puolen : aiolinen sointukulku populaarimusiikissa
2013
Tässä tutkielmassa tutkitaan yhdenlaista aiolista sointukulkua populaarimusiikissa. Sointukulus-sa ensimmäinen sointu i ja viimeinen sointu bVII aste. Tarkoituksena on löytää sointukulun alku-perä ja lähtökohta sekä sointukulun tyypillisin muoto. Sointukulkuja tarkastellaan erilaisten musiikinteorioiden kautta. Päänäkökulman on psykologias-ta skeemateoria sekä pohdintaan genren merkitystä sointukulkuun. Perinteisen musiikkiteorioi-den avulla luodaan lähtökohdat tarkastelulle. Skeemateorian avulla voidaan tarkastella sointuku-lun historiaa sekä sointukulun rakennetta ja ulottuvuuksia. 1980-luvun puoli välissä ilmestynyt Iron Maidenin Aces High -kappale näyttäisi sisältävän tä-män sointukulku…
Palkeet puhkumaan : harmonikansoiton alkeisoppimateriaali lapsille
2008
Metsäkukkia juurineen : menetelmiä harmonikansoiton aikuispedagogiikkaan
2011
Musiikkipedagogiikka pohtii oppimista perinteisesti lasten ja nuorten kautta. Tutkielmassani kuitenkin lähestyn erilaisia oppimisen käsitteitä aikuisen harmonikansoiton harrastajan näkökulmasta ja pyrin löytämään heille sopivat harjoitusmetodit, jotka auttaisivat motivoitumaan, harjoittelemaan oikein ja hallitsemaan paremmin harmonikan soittotekniikkaa. Käsittelen myös harmonikan syntyvaiheita, sen musiikillisen kehityksen historiaa, rakennetta, soittoteknisiä mahdollisuuksia ja analysoin harmonikansoiton aiempia oppimateriaaleja ja tutkimuksia. Tutkimukseni kohdistuu aikuisten harmonikansoittajien musiikillisten tavoitteiden mukanaan tuomiin haasteisiin ja niiden ratkaisemiseen. Aikuisten …
Realization of time-resolved two-vacuum-ultraviolet-photon ionization
2009
International audience; Ultrafast dynamics of excited molecules is studied through time-resolved two-vacuum-ultraviolet (vuv)- photon ionization using a nonlinear volume autocorrelator unit. The two-vuv-photon process is induced by the intense fifth harmonic radiation of a femtosecond Ti:sapphire laser. In a proof-of-principle experiment, ultrafast dynamics of excited ethylene and oxygen molecules are investigated. Molecular decay times are deduced by comparing the experimental data with the results of a numerical model that accounts for the spatial and temporal characteristics of the harmonic field. The present experiments pave a convenient way for time domain investigations in the vuv-xuv s…
Italy in Uncertain Times: Europeanizing Foreign Policy in the Declining Proces of the American Hegemony
2019
Il libro analizza l'influenza dei cambiamenti nell'ordine internazionale egemonico a guida americana sulle variazioni nei pilastri tradizionali della politica estera italiana (USA, UE e multilateralismo) ed il ruolo che l'Italia gioca all'interno di quell'ordine. Per esplorare queste variazioni, il libro propone un'analisi del comportamento di voto e di sponsorizzazione dell'Italia alle Nazioni Unite nel periodo 2000-2017, guardando sia all'Assemblea Generale sia al Consiglio di Sicurezza, ed enfatizza l'importanza di quest'ultima sede per individuare i riflessi dei cambiamenti nel sistema internazionale sul comportamento italiano. Concentrandosi sul comportamento coalizionale, il libro esp…
A specific operative protocol set up during the restoration of San Michele Arcangelo’s marble statue
2009
Questo lavoro descrive le diverse fasi dell’intervento di conservazione di una statua di marmo del XVI secolo, raffigurante San Michele Arcangelo, custodita presso la Galleria Regionale di Palazzo Abatellis di Palermo. Inizialmente è stata effettuata un’indagine di archivio per inquadrare l’opera dal punto di vista storico artistico ed iconografico. Quindi sono stati effettuati: un rilievo grafico e digitale 3D, una mappatura di tutte le forme di degrado rilevate e dei segni di interventi precedenti, le analisi dei materiali costitutivi e dello stato di conservazione, mediante tecniche non distruttive o microdistruttive. Infine è stato progettato ed eseguito l’intervento di conservazione, a…