94 research outputs found
Energy efficiency technologies for industry and tertiary sectors: The European experience and perspective for the future.
No full textThis paper reports practical examples of energy saving systems implemented in Europe by combined actions in both facilities and process equipment, by using basic technologies which, with slight modifications, can be widely applied to industry and tertiary sectors. Starting from these experiences, proposals for energy savings in the future are reported by taking into account renewable energy applications, new energy storage systems, the use of IT and power electronics to improve plant control systems, new technologies such as a wider use of electricity instead of thermal energy from fuels. The use of electricity is encouraged by the continuous increase of utility plant efficiency up to 60% and also by the main beneficial environmental features of a concentrated emissions production. A similar approach can also be used for buildings whose consumptions are expected to drop down to 30-40% of the current ones
Active voltage balancement of series connected IGBTs
No full textSeries connection of IGBT devices is a standard solution in high voltage power conversion applications, such as color TV deflections, inverters for medium voltage lines or modern railway traction drives. In serial connections of IGBTs, a suitable voltage balance must be guaranteed either at steady state or during switching transients in order to avoid damaging overvoltages. In the present paper, a new approach is proposed in order to equalize the voltage distribution between series connected IGBTs during turn-off transients by controlling the gate capacitance charge profile. The main advantages of such an approach consist in avoiding the use of passive components on the power side and in working exclusively on the gate driving signals. The effectiveness of the proposed approach is verified by simulation and experimental tests
Metodologie a rumore aggiunto nei sistemi di misura
No full textDottorato di ricerca in ingegneria elettrotecnica. 11. ciclo. Coordinatore Alfio Consoli. Tutore Nicola PitroneConsiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 , Rome; Biblioteca Nazionale Centrale - P.za Cavalleggeri, 1, Florence / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
Reflections and Comments: A Reading of the book Il Medioevo Degli Alberi. Piante e Paesaggi d'Italia (secoli XI-XV) by Alfio Cortonesi
No full textThis critical commentary revolves around the recent book by Alfio Cortonesi entitled Il Medioevo degli alberi. Piante e paesaggi d'Italia (secoli XI-XV). Taking into account the basic research carried out in recent years, the author proposes an interpretative synthesis of particular relevance that can be considered a model to be followed in the coming years.Este comentario crítico gira en torno al reciente libro de Alfio Cortonesi titulado Il Medioevo degli alberi. Piante e paesaggi d'Italia (secoli XI-XV). Tomando en consideración las investigaciones de base realizadas en los últimos años, el autor propone una síntesis interpretativa de especial relevancia que puede ser considerada un modelo a seguir en los próximos años
Reflexiones y comentarios: una lectura del libro Il Medioevo degli Alberi. Piante e Paesaggi d’Italia (Secoli XI-XV) de Alfio Cortonesi
No full textEste comentario crítico gira en torno al reciente libro de Alfio Cortonesi titulado Il Medioevo degli alberi. Piante e paesaggi d’Italia (secoli XI-XV). Tomando en consideración las investigaciones de base realizadas en los últimos años, el autor propone una síntesis interpretativa de especial relevancia que puede ser considerada un modelo a seguir en los próximos años.
This critical commentary revolves around the recent book by Alfio Cortonesi entitled Il Medioevo degli alberi. Piante e paesaggi d’Italia (secoli xi-xv). Taking into account the basic research carried out in recent years, the author proposes an interpretative synthesis of particular relevance that can be considered a model to be followed in the coming years
On the senior authorship of Musca oleae (Diptera: Tephritidae)
No full textPietro Rossi (1738–1804), Professor at the University of Pisa, in 1790 described the olive fruit
fly Musca oleae in his opus Fauna Etrusca and for the next 121 years, Rossi was considered its
author. During all the 900 century, Gmelin was considered the senior author. In this paper we report that the date of Rossi's Fauna Etrusca has
been found to pre-date Gmelin's 13th Edition for the part that includes Musca oleae. Thus, we conclude that the senior author has to be considered definitively
Rossi and not Gmelin
UTILIZZAZIONE INDIRETTA E TUTELA DEI LAVORATORI NEGLI APPALTI
No full textLa tesi si prefigge di ricostruire il quadro normativo e concettuale che si è venuto ad enucleare a seguito dell’abrogazione della legge n.1369/1960 in tema di interposizione di manodopera, nonché della contemporanea dilatazione della responsabilità solidale del committente di un appalto di opera o servizi in forza del disposto dell’art. 29, d.lgs. n. 276/2003.
Nella prospettiva di attribuire al regime di solidarietà particolare attenzione l’Autore descrive, nel primo capitolo, tutte le ipotesi di responsabilità solidale presenti nel Codice civile con l’intento di individuare una base comune a tutte le fattispecie prese in esame.
Nel capitolo secondo si analizzano le evoluzioni dell’art. 29, d.lgs. n. 276/2003 e le numerose modifiche che tale norma ha dovuto sopportare, estendendo l’analisi al regime contributivo e fiscale, nonché alla disciplina relativa alla salute e sicurezza dei lavoratori.
Il terzo capitolo, infine, analizza gli aspetti critici della solidarietà negli appalti, dal tema della successione nel contratto di appalto da parte di un nuovo appaltatore a quello della compatibilità delle clausole sociali con il diritto europeo passando per la derogabilità al suddetto regime da parte della contrattazione collettiva, alle ipotesi di simulazione di contratti di appalto, senza tralasciare di analizzare l’ambito di applicazione della responsabilità solidale di cui all’art. 29, d.lgs. n. 276/2003 anche ad altre fattispecie negoziali attigue all’appalto.
L’analisi si conclude, poi, con la confutazione dell’opinione dottrinale secondo la quale le esternalizzazioni d’impresa realizzate attraverso contratti di appalto porterebbero all’insorgenza di ipotesi di codatorialità.The thesis aims to reconstruct the conceptual framework and that it has come to devise following the repeal of the law n.1369/1960 concerning the interposition of labor, as well as the contemporary expansion of joint liability of the buyer of a tender contract for work or services under the provisions of art. 29, Legislative Decree n. 276/2003.
In the perspective of giving special attention to the system of joint and several liability in tender contracts the author describes, in the first chapter, all cases of joint and several liability in the Italian Civil Code with the intent to establish a common base in all cases examined.
In the second chapter we analyze the evolution of the art. 29, Legislative Decree n. 276/2003 and the many changes that this standard has had to endure, extending the analysis to social insurance contribution and tax, as well as the rules on the health and safety of workers.
The third chapter analyzes the critical aspects of joint and several liability in tender contracts, the issue of succession in the contract by a new contractor to that of the compatibility of social clauses with European law through the derogation to that scheme by the collective bargaining, the simulation assumptions of tender contracts, without neglecting to analyze the scope of joint liability in art. 29 , Legislative Decree n. 276/2003 also to other cases adjacent negotiating. The analysis concludes, then, with the refutation doctrinal opinion according to which the outsourcing business achieved through procurement contracts would lead to the onset of hypotheses of joint employment doctrine
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