187,203 research outputs found
Interculturality as collaborative identity management in language education
No full textJust over ten years ago, Block (2007, p. 2) called the increasing attention that second language
researchers – and social scientists at large – were giving to the construct of ‘identity’ an “obsession”.
Since then, the identities of those who use, learn or study a language have been investigated in greater
detail (e.g., Benson, Barkhuizen, Bodycott & Brown, 2013; Clarke, 2008; Dörnyei & Ushioda, 2009;
Edwards, 2009). It may seem that intercultural language education is lagging behind this tendency.
However, a number of publications (e.g., Kramsch, 2009; Rivers & Houghton, 2013) suggest that,
considering contemporary global societies, the intercultural goals of language learning and teaching
can be better promoted by replacing the notion of ‘culture’ with that of multiple ‘identities’ or
‘subjectivities’. More specifically, language education can aim to make students capable of selecting
the language resources available to them in order to express their (developing) desired identities and,
at the same time, to recognise the multiple identities that their interlocutors put forth in a given context
(Borghetti, 2016). To make the case for this ‘identity-related intercultural language education’, the
article reviews and discusses a number of studies which, from different perspectives, have already
argued for a more prominent role of the construct of ‘identity’ in the field of second language
education
Consequence analysis of the accidental scenarios
No full textThis chapter describes the approach used to determine the evolution of the consequences for each of the accidental scenarios considered in the risk analysis procedure. The consequence analysis allows to estimate which are the negative effects of the accidents that can affect both the egress and tenability of tunnel users
Queue formation model
No full textThis chapter describes in detail the vehicle queue formation model for each lane inside the tunnel following an accident
An automatic system to locate phase-to-ground faults in medium voltage cable networks based on the wavelet analysis of high-frequency signals
No full textThe paper presents a microcontroller-based automatic system that applies the continuous wavelet analysis to the measured fault-originated electromagnetic transients in order to locate phase-to-ground faults in power distribution networks composed by coaxial cables. The paper describes the numerical procedure conceived to: (i) detect the presence of fault-originated transients superimposed to steady-state voltage waveforms, (ii) identify the faulted phase-conductor and (iii) identify the part of the fault transient that can be used to build a specific mother wavelet so to improve the fault location accuracy. The paper also describes the implementation of the procedure into an embedded microcontroller as well as its experimental validation carried out by means of analog real-time generated fault waveforms obtained from EMTP simulations. © 2011 IEEE.DESLDepartment of Electrical Engineering, University of Bologna, Bologna, Italy, Conference code: 86744, Export Date: 25 April 2012, Source: Scopus, Art. No.: 6019280, doi: 10.1109/PTC.2011.6019280, Language of Original Document: English, Correspondence Address: Paolone, M.; Department of Electrical Engineering, University of Bologna, Bologna, Italy; email: [email protected], References: Radial distribution test feeders (1991) IEEE Trans. Power Syst., 6 (3), pp. 975-985. , IEEE Distribution Planning Working Group, Aug; (1998) CIRED WG03 Fault Management, , Fault Management in Electrical Distribution Systems; (2004) IEEE Guide for Determining Fault Location on AC Transmission and Distribution Lines, , IEEE Std C37.114; Sachdev, M.S., Agarwal, R., TECHNIQUE FOR ESTIMATING TRANSMISSION LINE FAULT LOCATIONS FROM DIGITAL IMPEDANCE RELAY MEASUREMENTS. (1988) IEEE Transactions on Power Delivery, 3 (1), pp. 121-129. , DOI 10.1109/61.4237; Srinivasan, K., St-Jacques, A., New fault location algorithm for radial transmission lines with loads (1989) IEEE Transactions on Power Delivery, 4 (3), pp. 1676-1682. , DOI 10.1109/61.32658; Girgis, A.A., Hart, D.G., Peterson, W.L., A new fault location technique for two- and three-terminal lines (1992) IEEE Trans. on PWRD, 7 (1), pp. 98-107. , Jan; Magnago, F.H., Abur, A., Fault location using wavelets (1998) IEEE Trans. on PWRD, 13 (4), pp. 1475-1480. , Oct; Magnago, F.H., Abur, A., A new fault location technique for radial distribution systems based on high frequency signals (1999) Proc. IEEE-Power Eng. Soc. Summer Meeting, 1, pp. 426-431. , Jul. 18-22; Izykowski, J., Rosolowski, E., Saha, M.M., Locating faults in power transmission lines under availability of complete measurements at one end (2004) IEE Proc. Gener. Transm. Distrib., 151 (2), pp. 268-273. , Mar; Borghetti, A., Corsi, S., Nucci, C.A., Paolone, M., Peretto, L., Tinarelli, R., On the use of continuous-wavelet transform for fault location in distribution power systems (2006) International Journal of Electrical Power and Energy Systems, 28 (9 SPEC. ISS.), pp. 608-617. , DOI 10.1016/j.ijepes.2006.03.001, PII S0142061506000792; Borghetti, A., Bosetti, M., Di Silvestro, M., Nucci, C.A., Paolone, M., Continuous-Wavelet Transform for Fault Location in Distribution Power Networks: Definition of Mother Wavelets Inferred from Fault Originated Transients (2008) IEEE Trans. on PWRS, 23 (2), pp. 380-388. , May; Borghetti, A., Bosetti, M., Nucci, C.A., Paolone, M., Abur, A., Integrated Use of Time-Frequency Wave-let Decompositions for Fault Location in Distribution Networks: Theory and Experimental Validation (2010) IEEE Trans. on PWRD, 25 (4), pp. 3139-3146. , Oct; Strang, G., Nguyen, T., (1996) Wavelets and Filter Banks, , Wellesley Cambridge Press; Mahseredjian, J., Lefebvre, S., Do, X.-D., A new method for time-domain modelling of nonlinear circuits in large linear networks Proc. of 11th Power Systems Computation Conference PSCC, August 1993; Mahseredjian, J., Dennetiere, S., Dube, L., Khodabakhchian, B., Gerin-Lajoie, L., On a new approach for the simulation of transients in power systems (2007) Electric Power Systems Research, 77 (11), pp. 1514-1520. , DOI 10.1016/j.epsr.2006.08.027, PII S0378779606002094; Greenwood, A., (1991) Electrical Transients in Power Systems, , John Wiley and Sons, New York; Clarke, E., (1943) Circuit Analysis of AC Power Systems 1, , John Wiley & Sons, New York; Peretto, L., Rinaldi, P., Sasdelli, R., Tinarelli, R., Fioravanti, A., Implementation and Characterization of a System for the Evaluation of the Starting Instant of Lightning-Induced Transients (2007) IEEE Trans. on Instrumentation and Measurement, 56 (5), pp. 1955-1960. , Oct; Yamabuki, K., Borghetti, A., Napolitano, F., Nucci, C.A., Paolone, M., Peretto, L., Tinarelli, R., Vitale, R., A Distributed Measurement System for Correlating Faults to Lightning in Distribution Networks Proc. of the International Symposium on High Voltage Engineering (ISH), Ljubljana, Slovenia, Aug. 27-31, 2007; Kunt, M., (1980) Traitement Numérique des Signaux, Traité D'électricité, 20. , EPFL, Switzerland; Grandke, T., INTERPOLATION ALGORITHMS FOR DISCRETE FOURIER TRANSFORMS OF WEIGHTED SIGNALS. (1983) IEEE Transactions on Instrumentation and Measurement, IM-32 (2), pp. 350-355; Graps, A., An introduction to wavelets (1995) IEEE Computational Science and Engineering, 2 (2), pp. 50-61; De Boor, C.A., (1978) A Practical Guide to Splines, , Springer-Verlag; Lobos, T., Sikorski, T., Schegner, P., Joint time-frequency representation of non-stationary signals in electrical power engineering Proc. of the 15th Power Systems Computation Conference (PSCC'05), Liege, Belgium, 22-26 August 2005, , paper fp 97; Borghetti, A., Morched, A.S., Napolitano, F., Nucci, C.A., Paolone, M., Lightning-Induced Overvoltages Transferred Through Distribution Power Transformers (2009) IEEE Trans. on PWRD, 24 (1), pp. 360-372. , Jan; Marti, L., Simulation of transients in underground cables with frequency-dependent modal transformation matrices (1988) IEEE Trans. on PWRD, 3 (3), pp. 1099-1110. , July; Dommel, H.W., Digital computer solution of Electromagnetic Transients in single and multiphase networks (1969) IEEE Transactions on PAS, 88, pp. 388-399. , April, Sponsors: IEEE; IEEE Power and Energy Society (PES
Egress model of tunnel users
No full textThis chapter describes the egress model of the users who are present in the tunnel. Starting from the user position, the available emergency exits and the dynamics of the accidental scenario, it is possible to verify the required safe egress time of the exposed users with the tenability thresholds
Road tunnels risk analysis
No full textThe risk analysis process for road tunnels with particular reference to the concept of risk and safety is described in this chapter. In particular, the specific characteristics of the risk models and the techniques of risk representation and acceptance are presented
Tunnel infrastructure measures, equipment and management procedures
No full textThis chapter describes the interdependence and estimate the reliability of the tunnel infrastructure measures, equipment and management procedures considered in the proposed model
Calculation of the F-N curve and the expected damage value
No full textThis chapter describes the implementation process of the F-N curve, which makes possible to represent the societal risk and subsequently verify its acceptance with respect to the ALARP criterion. The F-N curve is evaluated starting from the frequencies of occurrence of the accidental events and the number of fatalities determined by each accidental scenario
Model calibration and validation
No full textThis chapter describes model calibration in order to verify its consistency. The sensitivity analysis carried out on the parameters and measures considered in the proposed model is described, with the aim of analysing their effect of the shape and position of the F-N curve. In addition, the result of a comparison made using QRAM software and carried out on three tunnels considered to be representative is illustrated
Model structure
No full textThis chapter describes the logical structure of the proposed tunnel risk analysis model. In particular, the event tree technique for estimating the frequencies of the accidental scenarios and the procedure for defining the location of the accidental scenarios along the tunnel are illustrated
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