1,465 research outputs found
Time-Reversed Optimal Control-Based Metric for Maneuvering Targets Correlation
No full textCorrelation plays a crucial role in maintaining a space object catalog, serving the purpose of determining if a known target produced a particular measurement. Statistical distance-based approaches are not always enough when dealing with controlled objects, leading to alternative correlation metrics that exploit the effort linking the track to candidate orbits. This work describes a novel optical measurement correlation assistance tool, exploiting optimal control theory to backpropagate an admissible region of observables to catalog epochs through a patchwork of Taylor polynomial expansions. The resulting minimum expense distributions are combined with a standard statistical distance to support the correlation of maneuvering objects. A sensitivity analysis on the defined metrics is performed on a set of synthetic scenarios involving impulsive maneuvers, chosen to easily connect the detected expense and effect on the orbit to the features of the control action
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
LSTM-based maneuver detection for resident space object catalog maintenance
No full textMaintaining a catalog of Resident Space Objects involves a wide range of activities, exploiting measurement processing to estimate and update orbits, in an effort to achieve a comprehensive picture of the Near-Earth environment status in terms of human-made objects. The first step required to update a cataloged orbit is to correctly associate it with new observations. This task is particularly hampered by the growing presence of active satellites that are capable of maneuvering. Nonetheless, a large part of them perform routine maneuvers to preserve their orbit, defining very regular patterns. Given the significant quantity of past orbital and maneuvering data about tracked objects as the main by-product of catalog maintenance, the main focus of this work is to effectively exploit them by training Machine Learning models. The objective is to infer the probability of a target maneuver within a specific time horizon, using a Long Short-Term Memory Recurrent Neural Network, specialized in processing time sequences. Two distinct maneuver detection modules are developed and tested on real LEO object data to, respectively, extend a target’s control history and predict how likely a maneuver will happen in the immediate future
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
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
Before and After the Commentators: An Essay in Periodization.
No full textL'articolo considera il significato storico e filosofico dei commentatori neoplatonici di Aristotele. Gli autori situano il recente Sourcebook sui commentatori edito da Richard Sorbji in un contesto più ampio, che include il contributo dei commentatori nella formazione della filosofia tardo-antica e la loro posterità nella tradizione filosofica islamica. Dopo una sezione introduttiva (1) sullo stato attuale della ricerca in questo ambito, gli autori affrontano i temi seguenti: (2) Plotino, i commentatori e lo sviluppo del pensiero tardo antico; (3) il Sourcebook e la filosofia islamica. Riccardo Chiaradonna è co-autore della sezione (1) e autore della sezione (2), dove la ricezione dei trattati di scuola aristotelici è presentata come una caratteristica fondamentale nella transizione dalla filosofia post-ellenistica a quella tardo-antica. Plotino ha un ruolo cruciale in questo processo e l'assimilazione neoplatonica dei trattati di Aristotele non avrebbe avuto luoro senza il suo contributo.This article considers the historical and philosophical significance of the Neoplatonic commentators on Aristotle. The authors set Richard Sorabji's recent Sourcebook on the commentators within a wider backgroung, which covers the commentators' contribution in the shaping of late antique philosophy and their posterity in the Islamic philosophical tradition. After an introductory section (1) regarding the current status of research in this area, the authors tackle the following issues: (2) Plotinus, the commentators and the development of late antique thought; (3) the Sourcebook and Islamic Philosophy. Riccardo Chiaradonna is co-author of section (1) and author of section (2), where the reception of Aristotle's school treatises is set out as a key feature in the transition from Post Hellenistic to Late Antique philosophy. Plotinus has a pivotal position in this process and the Neoplatonic incorporation of Aristotle's treatises would have not taken place without Plotinus' contribution
Assessing Occupational Chemical Risk Perception in Construction Workers: A Cross-Sectional Study
No full textSafety in workplaces is a requirement for work sustainability. Construction workers are frequently exposed to dangerous airborne substances. While previous studies examined chemical risks in other sectors, there is limited research on occupational chemical risk perception (OCRP) among construction workers. This study focuses on evaluating OCRP in construction workers and identifying its association with socio-demographic, occupational, and training variables. In L’Aquila, Italy, a sample of male construction workers involved in post-earthquake reconstruction were enrolled in this cross-sectional study. Chemical hazard perception, occupational exposure, personal protective equipment (PPE) use, and training were all covered by our questionnaire. Although the involved 117 workers appear to be aware of dust-related risks and asbestos-related diseases, 53% think that there is no asbestos at their worksite. Respiratory protection equipment was used by 36% of the respondents. OCRP was associated with refresher training (OR = 2.56; p = 0.025); perception of noise (OR = 10.03; p = 0.027); and solar radiation (OR = 26.07; p = 0.001). Although we observed an appropriate awareness of some occupational hazards, gaps between awareness, hazard perception, and protective behavior were evident. Comprehensive site inspections and improved risk communication are necessary to assess chemical hazards and enhance work sustainability
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