Search results for " Oriente"
showing 10 items of 184 documents
Vibration signature analysis for rotor broken bar diagnosis in double cage induction motor drives
2013
The paper investigates the diagnosis of rotor broken bars in field oriented controlled (FOC) double cage induction motor drives, using current and vibration signature analysis techniques. The Impact of the closed loop control system cannot be neglected when the detection of asymmetries in the machine are based on the signature analysis of electrical variables. The proposed diagnosis approach is based on optimized use of wavelet analysis by a pre-processing of phase current or axial/radial vibration signals. Thus, the time evolution of the tracked rotor fault components can be effectively analyzed. This paper shows also the relevance of the fault components computed from axial vibration sign…
Market-oriented analysis for active distribution systems
2009
Distribution networks are today the place where demand and offer are physically located and meet. Offer comes from Generation companies, through distributed generation, while demand is usually represented by simple users. Distribution company both buy and sell energy so they implement both sides. The EU promotes the free market and the renewable energy sources (RES) supported by the distributed generation technology. The technical-economical scenario in which distributed generation is thus growing is complex and comprises a large number of stakeholders. The authors, on the basis of previous studies want to analyse the problem of identifying sets of stakeholders sharing the common interest o…
Closed-loop bandwidth impact on MVSA for rotor broken bar diagnosis in IRFOC double squirrel cage induction motor drives
2013
This paper investigates the detectability of rotor broken bars in indirect rotor flux oriented control (IRFOC) for variable speed double cage induction motor drives, using vibration signature analysis techniques. The Impact of the closed loop control system cannot be neglected when the detection of rotor asymmetries in the machine is based on the signature analysis of electrical or mechanical variables. Therefore, the investigation of rotor fault components for different bandwidths of closed-loop regulators is necessary to evaluate its relevance in the above listed variables. This paper investigates the impact of the control system on relevance of the fault components computed from axial an…
Fifth Generation Networking Principles for a Service Driven Future Internet Architecture
2010
Published version of an article published in Wireless Personal Communications, vol. 57:393-411. Also available from the publisher at: http://dx.doi.org/10.1007/s11277-010-0076-7 The vision of all-IP networks where IP forms the simple common layer understandable across the whole network has undeniable advantages. However, such simplicity comes as a major hurdle to flexibility and functionality to the architecture. This is evident from the increasingly numerous and complex engineering solutions and optimizations required to accommodate essential qualities like mobility, security, realtime communication support etc or to mitigate the shortcomings inherent in the 'traditional Internet' architec…
A modular approach in teaching thyristor rectifiers with equation-oriented softwares
2014
This article is devoted to some issues of teaching power electronics in university courses. In the modern education system the students are expected to be no longer subject of passive learning, but that, within a certain extent, they collaborate in their training interactively with the teacher to develop the applications and the topics of the studied framework. For this purpose, this article presents a modular approach for teaching module regarding three-phase thyristor rectifiers. A simulator based on the MATLAB equation solver has been developed by considering the detailed physical operation of such converters. In particular, the realized simulator takes various aspects into account, incl…
Tell Shiyukh Tahtani, Nord Siria. Relazione sull'attività della Missione Eufrate nell'anno 2008.
2008
Survey and excavations in the Middle Euphrates Valley, Syria. 2008 Season.
Tell Shiyukh Tahtani on the Euphrates. Highlights of the last excavation seasons
2010
In recent years (2006-09) the University of Palermo Euphrates expedition has continued rescue excavations at Tell Shiyukh Tahtani (the “Lower Hill of Sheikhs”) as part of the Tishreen Dam Salvage Project. Located on the left bank of the River south of Jerablus, in the land that once was the Carchemish district, this small mound has revealed a long occupation sequence from around 3.000 B.C. to Byzantine and early Islamic times. During the last three seasons we mainly concentrated in the investigation of the eastern slope of the upper tell (Area CD), where a continuous Bronze Age occupation has been detected. Apart from the later levels (EB IV, Middle and Late Bronze Age), one of the main goa…
On thermoeconomics of energy systems at variable load conditions: integrated optimization of plant design and operation
2007
Abstract Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, its different methodologies allowing solution of problems in the fields of cost accounting, plant design optimisation and diagnostic of malfunctions. However, the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasi-steady operation, but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variable energy demand. In this paper, the fundamentals of thermoeconomics for systems operated at variable load are discussed, examining the cost formation process an…
Application of the discussion groups and initial phases of the qfd methodology to the study of Valencian ball trinquetes
2011
Montaner AM, Montaner C, Perez-Soriano P, Carrasco-Embuena V, Llana-Belloch S. Application of the discussion groups and initial phases of the qfd methodology to the study of valencian ball trinquetes. J. Hum. Sport Exerc. Vol. 6, No. 4, pp. 629-638, 2011. The purpose of this research is to show an opinion study about the specifications that the valencian ball trinquetes should have according to the players’ opinion. The valencian ball game is a native sport with a great cultural tradition in the Valencian Community and it has been practised in the trinquetes since the XIV century. Despite its history, these facilities do not have the normative requirements for suitable sport development. Th…
Intellectual Capital in a Services-Oriented Firm
2013
This chapter discusses the Intellectual Capital (IC) and its management within the services-oriented firms. It argues that IC and its management are as important as in a product-oriented firm. The authors aim to analyze the intellectual capital in the service-oriented firms, focusing on various components, such as human, structural, and relational capital (IC stock), and how to manage it (IC activities). Specifically, the authors examine IC stock and IC activities in a special type of Italian services firms: the Local Public Utility (LPU). These firms are peculiar since were affected by the privatization process and this has made a great need for rethinking the role of intellectual capital …