330,154 research outputs found
Matter-antimatter asymmetry induced by Barbero-Immirzi parameter
No full textWe review the baryon asymmetry generated in the early Universe in the framework of the metric-spinor gravity with the Holst term, which accounts for the Barbero-Immirzi parameter. For the generation of the matter-antimatter asymmetry, we have considered the model in which the time derivative of the Ricci scalar couples with matter currents (this model is known in the literature as gravitational baryogenesis). By using the current bounds on the parameter of the asymmetry, the ratio of baryon number to the entropy density, we infer a bound on the parameters characterizing the model under consideration (that is, the cosmological model in the presence of the torsion and Barbero-Immirzi parameter).(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3
Comment on "Phenomenological approach to the problem of the K13-surface-like elastic term in the free energy of a nematic liquid crystal
No full textIn a recent paper [Phys. Rev. E 48, 1254 (1993)], an alternative procedure is proposed for obtaining the nematic director field that minimizes the total free energy of a nematic liquid crystal. In this Comment we show that this solution does not correspond to a minimum of the free energy
Designing Open Innovation Ecosystems for Small and Medium Enterprises
Full text linkEurope's transition to a circular economy is as much an environmental, economic and social necessity as it is an opportunity for European companies and citizens. Despite encouraging promises, many barriers hinder the circular transition of European companies, especially SMEs, which represent the bulk of Europe's industrial fabric. The presentation shows the case study of the 'DigiCirc' project (call H2020-INNOSUP) that creates and coordinates innovation ecosystems involving a broad range of stakeholders to foster connections and collaborations, supported by digital tools. The role of Systemic Designers in the project mainly focused on stakeholder selection and engagement, and on the training of participants on circular economy knowledge and systemic approach methods. The authors offer some reflections starting from the project's experience to understand how Design, in particular Systemic Design, can contribute to the creation of digital innovation ecosystems and how it can help enterprises overcome the barriers identified in the literature and past experiences. The aim is to open the debate on sustainability transitions and practical co-design experiences with stakeholders to foster those transitions. Authors are addressing design scholars and practitioners dealing with innovation and transition of socio-technical systems within industrial and cross- disciplinary environments
Systemic design for sustainable territorial development: ecosystem definition to support autopoietic local economies
Full text linkTo meet the current challenges to fight global and interconnected problems as waste production, systemic thinking is needed to provide a new cultural paradigm to create Sustainable, Circular and Blue Economies. One action can be done spotlighting the local territory in which we are living every day enhancing cultural and natural resources, indeed of considering it as a place where the products are manufactured, travel everywhere and leave only waste. Systemic Design can
provide an answer creating eco-innovation and environmental, social and economic sustainability, especially at the local level. A multiple case-study analysis on previous projects on Systemic Design has conducted to understand the principal barriers in their implementation and their outcomes to reach sustainable territorial development. After the identification of the new opportunities created at the entrepreneurial level, finally, it is designing the entrepreneurial ecosystem of innovation to foster Systemic sustainable projects framed in a specific context of referenc
Design of an ecosystem to foster systemic eco-innovation. Systemic design for autopoietic local economies
Full text linkThe current global environmental situation, with its interconnected problems, requires holistic approaches to provide a cultural paradigm shift and a different economy to overcome the linear one. Systemic Design (SD) can represent a solution creating opportunities for eco- and system innovation, especially in the manufacturing sector, which will soon face a revolution in the production model. Thus, SD can help achieve environmental and economic sustainability at the local level. A multiple case study analysis on SD projects was developed to understand the significant eco-entrepreneurial opportunities that have emerged and the barriers for their
implementation. Finally, an ecosystem is designed to foster systemic innovation based on helix innovation models and identify the facilitator for its creation, namely, the ‘local systemic network booster’
From (new) media to (hyper) mediations Recovering Jesús Martín-Barbero's mediation theory in the age of digital communication and cultural convergence
No full textJesús Martín-Barbero is considered one of the main references of Latin American media and cultural studies. This article recovers his works and proposes an update of his contributions within the context of the contemporary media ecology. After describing the conversations that characterized the Latin American academic circuit in the early 1980s, the article introduces Martín-Barbero's theory of mediation, taking as a reference his influential book De los Medios a las Mediaciones (1987). The article then explores two paths: a contemporary reading of Martín-Barbero's contributions from a digital perspective and a comparison between Martín-Barbero's mediation and Henry Jenkins' convergence culture
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