1,305 research outputs found
Chapter Profilo minimo dell’opera di Riccardo Del Punta (1957-2022)
No full textThe author reconstructs and comments on the scientific production of Riccardo del Punta, examining his style, influences, lines of research, and legacy for labour law
Grabbing device of graphite blocks arranged in nuclear reactors, and apparatus and method for extracting such graphite blocks
No full textGrabbing device (1) of at least one graphite block (20) arranged within a nuclear reactor,
comprising:
- a support (2) suitable for being inserted within the reactor core and on which there are
arranged:
- one or more anchor elements (3) configured to partially penetrate within and
engage solidly with said graphite block (20); and
- one or more suction cups (4) suitable for being positioned against a first surface
(21) of said graphite block (20);
- at least one depressurization device (10) connected to said one or more suction cups (4)
through at least one suction channel (11), said depressurization device (10) generating,
when operated, a depression within said one or more suction cups (4) so as to cause them
to adhere to said first surface (21) of the graphite block (20)
Chapter Capability e diritto del lavoro: non solo teoria. Dialogando con Riccardo del Punta
No full textThe paper is a tribute to Riccardo Del Punta, intellectual and jurist. The common thread is the use of Capability Approach in labour law which links the Author to his friend who passed away prematurely. The essay is also an opportunity to revisit the basic foundations of the Capability theory and the recent debate among international labour law scholars with regard to its possible use in the great transformation induced by the double (green and digital) transition
Preliminary study on oxidation of nuclear grade graphite
No full textA test methodology has been defined in order to assess the risk of bulk-oxidation of nuclear graphite with a
focus on particular operations, such as cutting of graphite components during decommissioning of nuclear
reactors. Graphite is used for its properties in nuclear reactors, as a fuel element matrix, moderator, structural
and reflector material.
The experimental tests have been performed using a horizontal TGA-DTA furnace and both isothermal and nonisothermal tests were performed on non-irradiated specimens.
In isothermal tests, testing temperature range was 550 – 750 °C, the selected temperature has been reached
heating the furnace under N2 atmosphere at 5 °C/min, then oxidation has been evaluated at constant
temperature in air (100 mL/min) for at least 180 min. Non-isothermal tests have been performed either under N2
atmosphere or air and samples have been heated at 5 °C/min from 30 to 950 °C.
As several properties may affect the oxidation resistance of nuclear graphite, such as impurities, grain size, pore
structure, graphitization degree, antioxidation treatments, the testing protocol has been preliminary applied to
non-irradiated graphite samples from two different graphite reactors.
Preliminary experimental results revealed the excellent ability of the tested graphite samples for oxidation
resistance with lower oxidation rates and longer oxidation times compared with some literature results
Characterization of removable coatings for graphite-moderated nuclear reactors decommissioning
No full textIn this study the behavior and characteristics of two removable coatings to be deposited on a nuclear grade
graphite substrate were analyzed, with the aim to evaluate their possible application on graphite bricks during
dismantling operations of graphite-moderated nuclear reactors.Indeed, nowadays many shut-down reactors are
still in decommissioning phase, and effective measures should be taken to guarantee safe dismantling
operations. One option could be the use of coating application techniques, which mitigate the risk of graphite
dusts spreading and loose contamination, protecting clean surfaces.Tested coatings, both polymeric mixtures,
were selected according to their previous application history, availability in commerce and easiness in handling,
whereas substrates used were non-irradiated nuclear Virgin Atcheson Graphite Ordinary Temperature (AGOT)
graphite samples from L-54M Politecnico di Milano research reactor, which is in decommissioning phase.
Thermal characterization of the coatings was carried out before deposition using a Thermogravimetric and
Differential Thermal Analysis (TGA-DTA) equipment, tests were performed to obtain a preliminary estimation of
the drying time and degradation conditions.
After deposition, mechanical properties, such as hardness, of the coating were assessed.
The preliminary experimental campaign showed that coating painting could be a feasible option to prevent the
spread of highly contaminated graphite dusts during decommissioning of graphite components of nuclear
reactors, thus ensuring clean and safe working conditions
Design and experimental assessment of an innovative vacuum end-effector for irradiated graphite handling
No full textThe decommissioning of graphite-moderated nuclear reactors presents considerable obstacles, primarily due to the handling of large volume of irradiated graphite that must be safely extracted and managed. In response to these difficulties, this work focuses on the design and validation of a novel vacuum-based system specifically engineered for the brick-by-brick retrieval of graphite components during reactor decommissioning. The proposed solution aims to overcome limitations of earlier methods, particularly those related to graphite cracking and the generation of secondary waste. The system developed is a proprietary end-effector that enhances suction-based lifting, achieving up to seventeen times increase in lifting power compared to existing industrial counterparts. This design has undergone testing and experimental trials under diverse operating conditions, replicating the handling of Magnox graphite blocks. The system's capabilities were assessed using key performance indicators such as lifting strength, safety margin, and adaptability under different operational scenarios. Results demonstrated a safety factor of 7 and the capability to lift damaged and broken blocks. The system also proved effective under less-than-ideal airflow conditions, maintaining high safety standards and demonstrating its robustness for real-world decommissioning tasks
Tra geometria e architettura: temi del dottorato di ricerca
No full textQuesto primo volume della Collana degli Strumenti si apre con un importante contributo di Giangiacomo Martines che introduce il tema del rapporto tra architettura e geometria nel mondo classico, portando esempi e inedite testimonianze frutto della grande esperienza dell’Autore, maturata in anni di studio e di contatto diretto con i più grandi monumenti del mondo romano. Alla voce di Martines si accompagnano poi, in un contrappunto ideale, quelle di alcuni giovani studiosi, che in diverse occasioni hanno affrontato il medesimo tema. Carlo Inglese espone alcuni notevoli risultati della sua ricerca sui tracciati di cantiere nell’antichità; Beatrice Angelini illustra recenti scoperte sulla complessa geometria della scala a chiocciola del Bramante, in Vaticano; Daniele Di Marzio ed Erminia Sciacchitano propongono due ricerche bibliografiche, rispettivamente dedicate al disegno e alla geometria della foglia di acanto e al tema generale di questo volume. I saggi sono introdotti da uno scritto di Mario Docci, che illustra le prospettive attuali delle scuole di Dottorato e da altri di Riccardo Migliari, che introducono alle linee di ricerca seguite nella scuola romana.This first volume of the series of instruments opens with an important contribution of Feltrinelli Martines which introduces the theme of the relationship between architecture and geometry in the classical world, by giving examples and unpublished testimonies result of extensive experience of the author, gained through years of study and direct contact with the most important monuments of the Roman world. Martines is accompanied by the voice of then, in a perfect counterpoint, some of those young scholars, who on several occasions have faced the same issue. Charles English exposes some remarkable results of his research on the tracks of the yard in antiquit
Hypertextual Library Manifesto Version 1.0
No full textTranslation by Juliana Mazzocchi with the collaboration of Maria Stella Sagaria and Riccardo Ridi. The Italian version was published as Manifesto per la biblioteca ipertestuale. Versione 1.0, Bibliotime X (2007), n. 3, http://www2.spbo.unibo.it/bibliotime/num-x-3/ridi.htm. This manifesto is a bridge between two texts: The Digital Libraries Manifesto, written by AIB Study group on digital libraries (in AIB-WEB since December 2005 at http://www.aib.it/aib/cg/gbdigd05a-e.htm3),and the author\u27s book La biblioteca come ipertesto (The library as hypertext, published by Editrice Bibliografica in October 2007, contents and abstract available at http://www.bibliografica.it/catalogo/ridi-ipertesto.htm). It presents the 25 Theses and the 5 Laws of the hypertextual library
It is foul weather in us all / Riccardo Boglione
No full textRiccardo Boglione sent copies of Shakespeare’s The Tempest to twelve artists living in Europe and America, each copy in the language of the country of residence of the artists, asking them to leave the book outside to the weather for as long as they wanted. The pages from those mistreated volumes reconstruct a Frankensteinian version of the play. In an extension of the metaphor of the tempest, the author gathers a small collection of injured volumes, mimicking Prospero’s book. Simultaneously he produces a version of Shakespeare’s play that shakes notions of authority (who is the real author? The invited artists? The English Bard? Boglione? The translators? Bad weather? Time?) and aesthetics (the ‘work’ of rain, snow, wind, and sun transformed the text’s characteristics, giving it a sculptural dimension that obfuscates its literary one). At stake once again, the perpetual dualisms: objects and words, nature and culture, Old and New World.
Contributors: Paolo Argeri, Luz María Bedoya, Carlos Capelán, Claude Closky, Felipe Cussen, Pablo Echaurren, Belén Gache, Sharon Kivland, Michalis Pichler, Nick Thurston, Pablo Uribe, Luca Viton
Va’ a l’orza! In ricordo dell’amico Riccardo (Dino) Brizzi
No full textIl contributo è dedicato al ricordo del Prof. Riccardo Brizzi (1920-2015), scrittore, grande esperto e studioso della marineria tradizionale dell'Adriatico, autore di importanti libri sull'argomento.The paper is dedicated to the memory of Prof. Riccardo Brizzi (1920-2015), writer, great expert and scholar of the Adriatic maritime tradition and author of important books on the subject
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