278 research outputs found
Mechanism of nucleophilic attack by secondary anilines on the nitrile group in platinum(II) ortho-cyanobenzyl complexes
No full textMechanism of nucleophilic attack by secondary anilines on the nitrile group in platinum(II) ortho-cyanobenzyl complexes
Self-adaptive high-frequency injection based sensorless control for interior permanent magnet synchronous motor drives †
No full textAbstract: An auto-tuning and self-adaptation procedure for High Frequency Injection (HFI) based position and speed estimation algorithms in Interior Permanent Magnet Synchronous Motor (IPMSM) drives is proposed in this paper. Analytical developments show that, using conventional approaches, the dynamics of the high-frequency tracking loop varies with differential inductances, which in turn depend on the machine operating point. On-line estimation and adaptation of the small signal gain of the loop is proposed here, allowing accurate auto-tuning of the sensorless control scheme which does not rely on a priori knowledge of the machine parameters. On-line adaptation of Phase-Locked Loop (PLL) gains and of the injected voltage magnitude is also possible, leading to important advantages from the performance, loss and acoustic point of view. The theoretical basis of the method has been introduced first and the main concept demonstrated by means of simulations. Implementation has been carried out using the hardware of a commercial industrial drive and two Interior Permanent Magnet Synchronous Motors, namely a prototype and an off-the-shelf machine. Experimental tests demonstrate the feasibility and effectiveness of the proposal
Magnetic resonance spectroscopy in the evaluation of treatment efficacy in unipolar major depressive disorder: a review of the literature
No full textMore and more neuroimaging studies are using in vivo proton magnetic resonance spectroscopy (1H-MRS) to explore correlates of response to therapy in major depressive disorder (MDD). Their aim is to further understanding of the effects of neurotransmitter changes in areas involved in MDD and the mechanisms underlying a good treatment response.
We set out to summarise the literature from the past fifteen years on biochemical correlates of treatment response in MDD patients, reflected in pre- and post-therapy changes in 1H-MRS measurements.
Our literature search identified fifteen articles reporting 1H-MRS studies in MDD treatment; no study used 1P-MRS.
Despite the wide diversity of 1H-MRS methods applied, brain regions studied, and metabolite changes found, there emerged strong evidence of a correlation between changes in neurometabolite concentrations, in particular glutamate, N-acetylaspartate and choline, and a good treatment response to pharmacotherapy or antidepressant stimulation techniques
MONITORAGGIO DELL'AREA UMIDA DI CASTELNOVO BARIANO (RO): RAPPORTO FINALE DELLE ATTIVITA' (PERIODO APRILE 2005 - DICEMBRE 2005) - CONSORZIO DI BONIFICA PADANA POLESANA
No full textIl Laboratorio di Analisi dei Sistemi Ambientali (L.A.S.A.) afferente al Dipartimento dei Processi
Chimici dell’Ingegneria dell’Università degli Studi di Padova da anni compie sperimentazioni
nell’area umida di Castelnovo Bariano (RO). Tale area è stata costruita impegnando fondi della
Regione Veneto con finalità di sperimentazione e ricerca sui processi di fitodepurazione, di
evoluzione ecologica e sulle problematiche relative alla gestione di un ecosistema di tipo palustre.
Nel corso delle precedenti sperimentazioni (L.A.S.A. 2004) sono emersi diversi problemi che
pregiudicano l’efficacia dell’area. E’ stato quindi presentato dal Consorzio di Bonifica Padana
Polesana, che attualmente gestisce l’area, un progetto di riqualificazione, approvato dalla Regione
Veneto, nell’ambito dell’Accordo di Programma Quadro per la tutela delle acque fra il Ministero
dell’Ambiente, Regione Veneto ed il Consorzio di Bonifica Padana Polesana stesso allo scopo di
migliorarne le prestazioni (Barausse A., 2004.). Queste opere sono state realizzate nella primavera
del 2005.
Scopo di questa nuova Convenzione fra il L.A.S.A. ed il Consorzio di Bonifica è quello di
verificare l’adeguatezza e l’efficienza dei lavori di riqualificazione e l’efficienza dell’area
nell’abbattimento dei nutrienti.
L’attività sperimentale prevista nella Convenzione in atto tra Università di Padova e Consorzio di
Bonifica Padana Polesana ha avuto inizio il giorno 28-04-2005 a seguito della stesura del verbale di
inizio attività previsto all’articolo 4 della Convenzione stessa
Self-Adaptive High-Frequency Injection Based Sensorless Control for IPMSM and SynRM
No full textAn auto-Tuning and self-Adaptation procedure for high-frequency injection (HFI) based position and speed estimation algorithms in IPMSM and SynRM drives is proposed in this paper. Analytical developments show that the dynamics of the high-frequency tracking loop varies with differential inductances, which in turn depend on the machine operating point due to saturation. On-line estimation and adaptation of the small-signal gain of the loop is proposed here, allowing accurate auto-Tuning of the sensorless control scheme, even without any a priori knowledge of the machine parameters. Interesting byproducts of this proposal are the possibility for on-line adaptation of the current controllers and of the injected voltage magnitude, leading to important advantages from the performance, loss and acoustic point-of-view. The theoretical basis of the method will be first introduced and the main concept demonstrated by means of simulations. Implementation has been carried out using the hardware of a standard industrial drive and two 2.2 kW prototype IPMSMs. Experimental test results demonstrate the feasibility and effectiveness of the proposa. ©2017 IEEE
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