Politecnio die Bari - Catalogo di prodotti della Ricerca
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The complex and transformative nature of circular supply chains: the role of dynamic capabilities, microfoundations, and digital technologies
No full textThe prevailing linear economic model faces growing sustainability challenges, prompting the urgent transition toward a circular economy. This shift requires the transformation of linear supply chains into circular supply chains that adopt regenerative and restorative strategies such as reuse, repair, remanufacturing, and recycling. However, they introduce significant managerial complexities due to augmented stakeholder networks, novel interdependencies, reverse flow uncertainties, and the need for new governance structures. Furthermore, operating in turbulent environments demands enhanced resilience and novel dynamic capabilities to navigate disruptions and evolve effectively. This doctoral research is grounded in the literature on circular supply chains, yet advances it by engaging with two complementary research streams. On one side, focusing on the emerging transformative supply chain management, it explores how traditional supply chains can be effectively transformed into new configurations like circular supply chains; on the other, it examines how the augmented complexity of circular supply chains can be governed toward high-performing and resilient configurations under increasing uncertainty and turbulence. Addressing these challenges requires developing novel theoretical frameworks. Accordingly, this research thesis introduces and explores such novel theoretical models through a multi-method research design including agent-based simulations, multiple case studies, and a Delphi study. Modern supply chains are conceptualized as social–ecological systems that successfully transform towards circular and resilient configurations through the supply chain transformative capabilities i.e., a novel set of supply chain dynamic capabilities comprising triggering, envisioning, navigating, and stabilizing capabilities, underpinned by an empirically identified and validated set of microfoundations. In this regard, empirical results permit us to explore the enabling role of digital technologies (e.g., Additive Manufacturing, AI, Big Data, Blockchain, Digital Twin) on the development of supply chain transformative capabilities. The augmented complexity of circular supply chain archetypes significantly affects the performance of circular supply chains and can be effectively governed through the design of purposeful coordination mechanisms. Specifically, our simulation-based results reveal that coordination effectiveness depends on the circular supply chain archetype: local collaboration enhances closed-loop performance, whereas global collaboration benefits open- and hybrid-loop systems. The dynamic nature of circular supply chains i.e., how the underlying structural archetypes evolve over time, significantly affects the ability to preserve the continuity of circular functions from disruptions by absorbing them and restoring original or more favorable resource loop structures, namely their resilience. Specifically, our simulation-based results show that the influence of evolutionary mechanisms on the resilience of circular economy networks varies with network topology and disruption type, underscoring the need for context-specific strategies. The research advances theory by exploring the social-ecological supply chain paradigm, extending dynamic capability theory to supply chain transformative capabilities, and deepening understanding of governance of their complexity through the lens of complex adaptive systems. Practically, it provides actionable insights for managers and policymakers to design more sustainable, resilient, and circular supply chain ecosystems
Da Caserma a Campus: il Parco dell'Innovazione come paradigma per la città di Bari | Form Barracks to Campus: the Innovation Park as a paradigmi for the city of Bari
No full textIl contributo interpreta la rigenerazione della ex Caserma Magrone di Bari come occasione per ridefinire un nuovo rapporto tra progetto urbano e costruzione della città. La trasformazione dell’impianto militare in Parco dell’Innovazione è assunta come paradigma per un modello di città fondato sulla riconversione dei recinti, sulla riattivazione del suolo e sulla ibridazione tra natura, conoscenza e forma urbana.
Attraverso un approccio morfologico e processuale, il progetto opera sulla struttura esistente, riconoscendone il valore tipologico e costruttivo e reinterpretandolo in chiave di campus urbano aperto, permeabile e interconnesso con il paesaggio metropolitano.
Gli “esercizi di stile” e i modelli planivolumetrici sviluppati definiscono un metodo di lavoro che alterna analisi, variazione e composizione, in cui la rifondazione delle relazioni spaziali si traduce in un dispositivo di progetto capace di integrare memoria, sostenibilità e nuove forme di socialità. Il Parco dell’Innovazione diventa così una figura paradigmatica per il progetto della città contemporanea, dove la forma costruita si misura con la geografia, il suolo e la trasformazione degli usi collettivi
Analysis of bike-friendly services for sustainable and resilient tourism: the case of Apulia region
No full textNowadays, experiential tourism, active tourism, sports tourism, and slow tourism have witnessed a remarkable surge in popularity, attracting a significant segment of travellers seeking unique and immersive experiences. These forms of tourism encompass activities that align with the principles of sustainability: the economic dimension, since it is an activity able to generate revenues for the administrations; the environmental one, being an ecological activity, fostering respect for nature and all living beings; the social one, since new paths provides both new transport infrastructure and possibility for recreation also for the local population. Cycling tourism is the main segment of this phenomenon, leading decision-makers to foster the financing and building of new recreational cycle paths at local and national levels. To ensure the success of cycling tourism initiatives, the approval and involvement of the public and citizens are crucial. Traditional decision-making methods may not fully capture the perspectives and preferences of these key stakeholders, necessitating the adoption of participatory procedures for evaluation. By employing participatory approaches, decision-makers can incorporate a wide range of voices, resulting in more informed and inclusive decision-making processes. Based on this premise, this study aims to develop a comprehensive framework for evaluating the implementation of cycling tourism services; CAWI (Computer Assisted Web Interviewing) is employed to gather insights from city administrators who play a pivotal role in the planning and implementation of cycling infrastructure and services. The Apulia region in Italy is selected as a case study due to its unique geographic characteristics, including a predominantly flat terrain with limited hills and its abundance of naturalistic attractions. Moreover, Apulia has recently launched the "Puglia Bike Destination strategy" a strategic plan designed to enhance cycling tourism throughout the region. A survey was conducted across all municipalities, local authorities, and trade associations in Apulia to comprehensively assess the existing cycling infrastructure, facilities, and equipment. The survey was designed to explore the willingness of stakeholders to implement new cycling services, particularly bike-sharing, as well as to gather insights into the challenges, opportunities, and specific requirements associated with such initiatives. The results will shed light on the existing infrastructure gaps, potential benefits, and challenges identified by the stakeholders, providing a comprehensive overview of the region's readiness and interest in promoting cycling tourism
Comparative Analysis of Digital Circuits in CNTFET and CMOS Technology: a Review
No full textIn this paper we review in depth a procedure to compare the performance of CNTFET and MOSFET devices through the design of a SRAM cell. The obtained results allow to say that with both technologies it is possible to realize low power devices, but with greater speed for the CNTFET technology
Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO
No full textContext. Geminga is the third gamma-ray pulsar firmly detected by imaging atmospheric Cherenkov telescopes (IACTs) after the Crab and the Vela pulsars. Most of its emission is expected at tens of giga-electronvolts, and, out of the planned telescopes of the upcoming Cherenkov Telescope Array Observatory (CTAO), the Large-Sized Telescopes (LSTs) are the only ones with optimised sensitivity at these energies. Aims. We aim to characterise the gamma-ray pulse shape and spectrum of Geminga as observed by the first LST (hereafter LST-1) of the Northern Array of CTAO. Furthermore, this study confirms the great performance and the improved energy threshold of the telescope, as low as 10 GeV for pulsar analysis, with respect to current-generation Cherenkov telescopes. Methods. We analysed 60 hours of good-quality data taken by the LST-1 between December 2022 and March 2024 at zenith angles below 50◦. Additionally, a new Fermi-LAT analysis of 16.6 years of data was carried out to extend the spectral analysis down to 100 MeV. Lastly, a detailed study of the systematic effects was performed. Results. We report the detection of Geminga in the energy range between 20 and 65 GeV. Of the two peaks of the phaseogram, the second one, P2, is detected with a significance of 12.2σ, while the first (P1) reaches a significance level of 2.6σ. The best-fit model for the spectrum of P2 was found to be a power law with a spectral index of Γ = (4.5±0.4stat)−+0062syssys, compatible with the previous results obtained by the MAGIC Collaboration. No evidence of curvature is found in the LST-1 energy range. The joint fit with Fermi-LAT data confirms a preference for a sub-exponential cut-off over a pure exponential, even though both models fail to reproduce the data above several tens of giga-electronvolts. The overall results presented in this paper prove that the LST-1 is an excellent telescope for the observation of pulsars, and improved sensitivity is expected to be achieved with the full CTAO Northern Array
Silicon slot metasurface supporting a multitude of bound states in the continuum: theoretical and experimental studies
No full textA dielectric metasurface supporting a variety of quasi-bound states in the continuum (qBICs), including the intricate dark toroidal dipole and toroidal quadrupole Mie modes, is theoretically and experimentally investigated in the near-infrared. The metasurface consists of square slots etched into a thin silicon layer and periodically arrayed in a subdiffractive lattice residing on a sapphire substrate. The modal properties of the qBICs, i.e., the quality factors alongside the near- and far-field characteristics, are comprehensively assessed through a set of theoretical tools, including eigenfrequency simulations and multipolar expansion analysis. The results are corroborated by experimental studies verifying the existence of the qBICs. The investigated metasurface may serve as an ideal platform for nonlinear applications, such as third-harmonic generation, when leveraging the Kerr effect of silicon, as well as for lasing when the slot is filled with a low-index material hosting organic dye molecules
Understanding smart sustainable buildings nexus to the new smart energy system
No full textDecarbonization, well-being, and high quality of life for citizens are some of the targets of the 17 Sustainable Development Goals of UN Agenda 2030. In this context, smart and sustainable cities should adopt cutting-edge technologies with the least environmental impact and an energy-efficient use for constructing infrastructures. Smart and sustainable buildings that maximize performance and energy use at all stages of the building life cycle are paramount. Smart, sustainable buildings are the key elements of positive energy districts and a smart, resilient, sustainable city. In this paper, after a cross-sectional summary of the European Union documents and legislative measures about building performance, the scenario on the main and appropriate methodological steps for identifying the optimal elements of positive energy districts is underlined
