Riflessioni sulla localizzazione della battaglia di Zama

Analisi delle ipotesi sulla localizzazione della Battaglia di Zama (18 ottobre 202 a.C.)

Refined Modeling and Compensation of Current Transformers Behavior for Line Parameters Estimation Based on Synchronized Measurements

Nowadays, in modern management and control applications, line parameters need to be known more accurately than in the past to achieve a reliable operation of the distribution grids. Phasor measurement units (PMUs) may improve line parameter estimation processes, but the accuracy of the result is affected by all the elements of the PMU-based measurement chain, in particular by the instrument transformers. Current transformers (CTs) are nonlinear and, therefore, their behavior is not easily described: their models cannot be straightforwardly included in the estimation problem. In this regard, this article refines modeling and compensation of CT systematic errors in line parameter estimation processes, based on different methods to describe the transformer behavior under various operating conditions. As the main result, the systematic errors of CTs are remarkably identified and mitigated. Moreover, the estimation of shunt susceptance values is significantly improved

La Provincia di Sassari: ambiente, storia, civiltà

Essere cittadino di una provincia non significa soltanto abitarvi. Significa anche lavorarvi, esercitarvi una attività che vada a vantaggio del benessere individuale e insieme del benessere della collettività. Per fare questo, per raggiungere meglio questo obiettivo, la realtà in cui si vive e si lavora bisogna conoscerla meno superficialmente di quanto normalmente non succeda. E' una constatazione che si può fare per tutti coloro che abitano in un luogo, ma che si deve fare in modo particolare quando lo strumento di conoscenza che si propone è un libro come questo

Scenari e prospettive del mercato RFID in Sardegna: tavola rotonda

2008-11-27Sardegna Ricerche, Edificio 2, Località Piscinamanna 09010 Pula (CA) - ItaliaPrima giornata sulle tecnologie RFID in Sardegn

Fault Identification in Three-Phase Distribution Networks Improved by Line Parameter Estimation

Fault detection and location algorithms require grid knowledge to be highly accurate. Possible deviations of actual line parameters with respect to the expected ones can affect the detection and location performance. To reduce fault analysis uncertainty, we propose the application of a simultaneous estimation of line parameters and systematic errors, along with a proper handling of the measurements chain, in a fault detection and location method. The validity of the proposed approach is confirmed by the simulations carried out by means of a Real Time Digital Simulator (RTDS) on the three-phase CIGRE European Medium Voltage distribution network

Mitral Valve Replacement with a Third Generation Porcine Valve: an Italian Multicentered Study

Postoperative outcomes of 3rd generation porcine bioprosthesis for mitral valve replacement (MVR) have been poorly addressed. The objective of this study was to perform an independent, retrospective, multicenter study on outcomes of patients undergoing MVR with Mosaic (Medtronic Inc., Minneapolis, MN) porcine bioposthesis