1,359,051 research outputs found
Dynamic ng-path relaxation for the delivery man problem
No full textThe ng-path relaxation was introduced by Baldacci, Mingozzi, and Roberti [Baldacci R, Mingozzi A, Roberti R (2011) New route relaxation and pricing strategies for the vehicle routing problem. Oper. Res. 59(5):1269–1283] for computing tight lower bounds to vehicle routing problems by solving a relaxation of the set-partitioning formulation, where routes are not necessarily elementary and can contain predefined subtours. The strength of the achieved lower bounds depends on the subtours that routes can perform. In this paper, we introduce a new general bounding procedure called dynamic ng-path relaxation that enhances the one of Baldacci, Mingozzi, and Roberti (2011) by iteratively redefining the subtours that routes can perform. We apply the bounding procedure on the well-known delivery man problem, which is a generalization of the traveling salesman problem where costs for traversing arcs depend on their positions along the tour. The proposed bounding procedure is based on column generation and computes a sequence of nondecreasing lower bounds to the problem. The final lower bound is used to solve the problem to optimality with a simple dynamic programming recursion. An extensive computational analysis on benchmark instances from the TSPLIB shows that the new bounding procedure yields better lower bounds than those provided by the method of Baldacci, Mingozzi, and Roberti (2011). Furthermore, the proposed exact method outperforms other exact methods recently presented in the literature and is able to close five open instances with up to 150 vertices
Erratum: Envisioning translational hyperscanning: how applied neuroscience might improve family-centered care (Social Cognitive and Affective Neuroscience (2022) (nsac061) DOI: 10.1093/scan/nsac061)
No full textThis is a correction to: Elisa Roberti, Elena Capelli, Livio Provenzi Envisioning translational hyperscanning: how applied neuroscience might improve family-centered care, Social Cognitive and Affective Neuroscience, 2022; nsac061, https://doi.org/10.1093/scan/nsac061 In the originally published version of this manuscript, the order of authors and the authors’ affiliations were incorrectly given as follows: Livio Provenzi,1,2 Elisa Roberti,2 and Elena Capelli2 1Department of Brain and Behavioral Sciences, University of Pavia, Pavia 27100, Italy 2Developmental Psychobiology Lab, IRCCS Mondino Foundation, Pavia 27100, Italy The Publisher apologizes for this error, which occurred during the production process. The author list and authors’ affiliations have now been corrected, as follows: Elisa Roberti,1 Elena Capelli,1 and Livio Provenzi2,1 1Developmental Psychobiology Lab, IRCCS Mondino Foundation, Pavia 27100, Italy 2Department of Brain and Behavioral Sciences, University of Pavia, Pavia 27100, Ital
Letter from Roberti to 'Gioacchino
No full textTypescript letter signed [Roberti], Tivoli, to 'Gioacchino' [...] for the attention of Signor Angelo [...]. Reporting on a visit to the Irish College's Tivoli premises with the engineer, and propositions for improving the fountain and water supply facilitie
Favole Esopiane
No full textWhat a treasure! Nicely worm-eaten! Index on 154-6 of the 70-80 fables, many of which seem to be post-Aesopic. Nice short-lined Italian verse. I will have to see a professional book restorer about this little gem. The decorations on the title page and 25 do not seem specifically Aesopic.This is a hardbound book (hard cover)Language note: ItalianOriginal language: grcGiambatista Roberti
Prove sperimentali speditive e valutazioni di vulnerabilità delle murature
No full textIl contributo descrive le modalità di studio, le prove eseguite e i risultati della campagna di ricerca su edifici danneggiati da sisma a Nocera Umbra, realizzata a seguito di convenzione tra Ministero per i Beni e le Attività Culturali- Istituto Centrale per il Restauro e Università IUAV di Venezia, responsabili scientifici Francesco Doglioni e Giulio Mirabella Roberti
Per una manutenzione mirata di sistemi complessi: uso di un modello spaziale come strumento operativo per la pubblica amministrazione.
No full textIl tema della manutenzione programmata è stato correttamente affrontato come alternativa ad interventi saltuari e occasionali di riparazione che spesso finiscono per rivestire caratteri di urgenza, dovuti a un degrado progressivo e crescente che rischia di compromettere seriamente e irreparabilmente l’integrità delle opere. La programmazione degli interventi di manutenzione su una scala pluriennale diventa una necessità quando il patrimonio da preservare presenta caratteri di estensione materiale e geografica come accade per insiemi monumentali particolari: il caso in esame si riferisce alla cinta muraria veneziana di Bergamo, ma si può estendere il ragionamento a complessi come alcune ville storiche o perfino ad ambiti urbani e paesaggistici.
In questa prospettiva la fase preliminare di conoscenza del manufatto riveste un’importanza fondamentale per lo sviluppo di strategie di intervento adeguate e mirate alla individuazione dei problemi ricorrenti da un lato e delle zone critiche meritevoli di particolare attenzione, stabilendo così una gerarchia di priorità su cui distribuire le (spesso limitate) risorse economiche disponibili. Particolarmente efficace si è rivelato l’uso del rilievo aereo-fotogrammetrico mediante UAV, con gli strumenti semplificati oggi disponibili, che consentono riprese sufficientemente ravvicinate da consentire la costruzione di modelli digitali dettagliati delle superfici dei manufatti esaminati e l’esame delle loro condizioni di conservazione.
Un esempio recente di applicazione di questa tecnica a un caso di particolare interesse è la campagna di rilievi avviata nell’ambito del progetto di manutenzione delle ‘mura venete’ di Bergamo. Il Comune di Bergamo, in sinergia con l’Università degli Studi, Orobica Ambiente e Italia Nostra, ha avviato – contestualmente al riconoscimento delle ‘Mura Venete’ come sito UNESCO patrimonio dell'umanità, all’interno della proposta “Opere di difesa veneziane tra il XVI ed il XVII secolo: Stato da terra – Stato da Mar Occidentale” – un piano per la manutenzione programmata delle Mura per contrastare i processi di degrado. Una serie di azioni finalizzate alla “manutenzione sostenibile e concepite come un processo di cura quotidiana dei diversi elementi architettonici che costituiscono il ‘paesaggio di pietra’ delle Mura Venete”. Gli interventi di conservazione sono preceduti da una fase di analisi, che sarà ripetuta periodicamente, comprendente ispezioni dirette in loco e sistematiche indagini conoscitive (con monitoraggio ciclico sul degrado materico per mezzo del rilevamento 3D con fotogrammetria aerea tramite droni).Planned maintenance is becoming more and more the way to face the problem of avoiding random or casual repair interventions, which often become emergency measures due to an increasing and progressive decay that menaces to endanger definitely the integrity of an artefact. Programming maintenance interventions on a many years scale become mandatory when the heritage to preserve shows features of huge material and geographical extent, as in the case of particular monumental sites. The examined case refers to the wall circle of Bergamo, but the argument can be also discussed in reference to some historical country houses or else to urban or landscape sites.
From this point of view, the preliminary knowledge phase plays a fundamental role in order to develop suitable and effective intervention strategies, focusing on one side on the detection of recurring problems, on the other on finding the critical zones where particular care must be applied, establishing also a priority ranking for employing the allowable (and often limited) economic resources. Very effective appears the use of aerial photogrammetric survey by UAV, thanks to the powerful software instruments that nowadays can be used, allowing nearly short-distance shooting that can lead to build detailed digital models of the surfaces of observed artifacts and the examination of their conservation conditions.
A recent example of the application of this technique to a particularly interesting object is the survey campaign developed in the framework of the maintenance project on ‘Venetian Walls’ of Bergamo. It is also a good example of collaboration among Public Administrations (the Municipality of Bergamo and the University) and private associations, like ‘Orobicambiente’ and ‘Italia Nostra’, involved in the conservation and protection of the heritage and the landscape. In July 2017, the ‘Venetian Walls’ were registered in the UNESCO World Heritage List as part of the serial multinational site Venetian Works of Defense between 16th and 17th Centuries: ‘Stato da tera’ – Western ‘Stato da Mar’. In the meantime, the Municipality of Bergamo began a project for setting up a maintenance program for the Walls in order to fight and contain the deterioration processes, with the scientific support of the University of Bergamo and the economical contribution of ‘Fondazione CARIPLO’. A series of actions aimed to the “sustainable maintenance, conceived as a daily treatment process of different architectural elements that compose the stone landscape of the Venetian Walls”. Conservation interventions are anticipated by an analytical phase that will be repeated recursively, including direct in situ inspections and systematic explorative investigations (with the cyclic monitoring of the material deterioration by means of 3D aero-photogrammetric survey using drones)
La scienza nelle lettere di Giambattista Roberti
No full textNel processo di conciliazione tra scienza e ortodossia promosso dai Gesuiti trovavano giustificazione la «Lettera sopra l’uso della
fisica nella poesia» (1765) di Giambattista Roberti, vero e proprio catalogo precettivo di moderna poesia della scienza, e altre
missive fittizie dello stesso gesuita bassanese che, pur elaborate secondo modalità diverse, presentavano un impianto più
divulgativo. L’intervento mira a definire i caratteri della lettera scientifica di Roberti, la cui fisionomia si fonda su alcuni tratti
distintivi nel contesto della letteratura gesuitica del secondo Settecento, nel tentativo di fare della poesia uno strumento utile alle
prospettive pedagogiche dell’Ordine
Per una rinnovata firmitas a Venezia: controllo e riparazione, non mutamento del congegno
No full textSharing Economy and Young People. A Qualitative Explorative Project
No full textThe paper aims to explore young people’s perception, motivations and actual practices of sharing economy.
Sharing and collaborative consumption are both growing in popularity leading to a shift of focus from good ownership to simple usage. Compared to more traditional sharing practices, the current one allows goods and services to be exchanged among strangers rather than among relatives and communities (Schor, Fitzmaurice 2015), thus the issues of trust and reputation become paramount. Some researchers have highlighted that especially young people are involved in sharing economy practices, e.g., they prefer sharing a car (carpooling or care sharing) than owning it (Belk 2014a). Since young people are both the most Internet savvy and the most prone to use smartphone apps, they are also comfortable in using services that are accessible through these devices (e.g., Car2go, Airbnb, Zipcar). In Italy, according to recent data (2018), Millennials are the main users of sharing economy services. Young people, from 18 to 34 years, have developed a culture of sharing and access to goods and services more than a culture of possession. Moreover, due to the economic crisis and many social changes, they have become more attentive to saving and more convenience oriented. For this reason, services such home or car sharing find less resistance and spread more easily among young people. Technologies and digital media enable to find ways to share resources, to connect people, to share objects, or to access sharing platforms. A deeper understanding of perception, motivations, and actual practices of sharing economy services should highlight future trends in collaborative consumption. Following a first quantitative study, the paper presents the results of four focus groups on the theme of the sharing economy inquiring perception, motivations and actual practices. The focus groups involved 36 university students attending a master’s degree course at IULM University of Milan. Informants, of both genders, are coming from North and South Italy. Despite some confusion between sharing economy services and delivery services, informants demonstrate a quite wide knowledge of sharing economy platforms. Trust is the issue preventing them to experience more fully the potential of sharing services. Convenience, connecting with new people, and making new experiences emerge as the leading motivations in engaging with these practices
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