333 research outputs found

    Perch\ue8 una governance europea ?

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    Regionalismo differenziato: opportunità e criticità

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    Re-Design of a Packaging Machine Employing Linear Servomotors: a Description of Modelling Methods and Engineering Tools

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    open4noPosition-controlled servo-systems mostly make use of electric rotary motors and gearboxes and, if necessary, a transmission mechanism to convert rotary into linear motion. Even so, especially in the field of automatic machines for packaging, it should be highlighted that most of the required movements are usually linear, so that Linear Electric Motors (LEM) should somehow represent a more convenient solution for designers. LEM can directly generate the required trajectory avoiding any intermediate mechanism, thus potentially minimizing the number of linkages/mechanical parts and, therefore, the undesired backlash and compliance that come along. On the other hand, particularly within small-medium enterprises, LEM may be rarely employed despite obvious advantages, mostly due to their high-cost as compared to rotary actuators and the lack of knowledge of the achievable performance. In light of these considerations, the present paper reports an industrial case study where an automatic machine for packaging, comprising distributed actuation and several tasks requiring a linear motion, has been completely redesigned employing different kind of LEM (i.e. iron-core and iron-less). Such machine architecture is compared to a “traditional” design where brushless gear-motors are coupled to linkage systems. The paper mainly focuses on the selection criteria for the LEM system and on the engineering tools employed during the different design stages. Qualitative and quantitative conclusions are finally drawn, which may provide useful hints for designers that are willing to actually employ LEM-based solutions in an industrial scenarioopenBerselli, Giovanni; Bilancia, Pietro; Bruzzone, Luca; Fanghella, PietroBerselli, Giovanni; Bilancia, Pietro; Bruzzone, Luca; Fanghella, Pietr

    Riflessioni sulla geografia del potere : poteri, diritti e sistema finanziario

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    L'effettività della Costituzione economica nel contesto dell’integrazione sovranazionale e della globalizzazione

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    Rapport sur la reforme du titre V de la deuxieme partie de la constitution italienne

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    La relazione esamina la riforma del titolo V della Costituzione italiana evidenziandone alcune criticit\ue0. La spinta alla valorizzazione delle autonomie territoriali lanciata dalla riforma costituzionale del 2001 sembra ora affievolirsi alla luce di previsti processi di riaccentramento delle competenze: una rimodulazione dei rapporti tra Stato e regioni sembra, infatti, rivisitare il modello federalistico sul quale l\u2019inizio del nuovo secolo sembrava aver puntato.The paper analyses the proposal of constitutional reform concerning the regional model enhanced in 2001. The evaluation of the system of the territorial autonomies designed by the preview constitutional reform appears revisited in a way of a kind of recentralization in the domain of the State

    Una situazione complessa : le leggi tra tagli e salvataggi

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    La dimensione europea dei diritti sociali

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    Riflessioni sulle recenti questioni in tema di dignità umana e fine vita

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