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  1. Article ; Online: A Covariant Non-Local Model of Bohm’s Quantum Potential

    Roberto Mauri / Massimiliano Giona

    Entropy, Vol 25, Iss 915, p

    2023  Volume 915

    Abstract: Assuming that the energy of a gas depends non-locally on the logarithm of its mass density, the body force in the resulting equation of motion consists of the sum of density gradient terms. Truncating this series after the second term, Bohm’s quantum ... ...

    Abstract Assuming that the energy of a gas depends non-locally on the logarithm of its mass density, the body force in the resulting equation of motion consists of the sum of density gradient terms. Truncating this series after the second term, Bohm’s quantum potential and the Madelung equation are obtained, showing explicitly that some of the hypotheses that led to the formulation of quantum mechanics do admit a classical interpretation based on non-locality. Here, we generalize this approach imposing a finite speed of propagation of any perturbation, thus determining a covariant formulation of the Madelung equation.
    Keywords non-local quantum mechanics ; Bohm quantum potential ; Madelung equation ; Science ; Q ; Astrophysics ; QB460-466 ; Physics ; QC1-999
    Language English
    Publishing date 2023-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Analysis of Territorial Risks and Protection Factors for the Business Continuity of Data Centers

    Veronica Gazzola / Scira Menoni / Paolo Ghignatti / Andrea Marini / Roberto Mauri / Giovanni Oldani

    Sustainability, Vol 15, Iss 6005, p

    2023  Volume 6005

    Abstract: The increasing trend towards the global use of Information Technology (IT) is currently determining the need for more and better infrastructures (both physical and digital) for processing, storing and transferring large amounts of data. As Critical ... ...

    Abstract The increasing trend towards the global use of Information Technology (IT) is currently determining the need for more and better infrastructures (both physical and digital) for processing, storing and transferring large amounts of data. As Critical Infrastructure (CI) that is potentially exposed and vulnerable to the impact of different types of phenomena (natural, technological, na-tech, etc.), data centers have to guarantee higher levels of security (physical, logical and operational), reliability and efficiency in the provision of services. Starting from a discussion of the main evidence related to this topic, considering both the most recent cases of failure and serious damage to data centers and the evolution of international and European regulation and standards, the authors propose an analytical methodology to assess the territorial risk factors for data centers by a multirisk, multi-dimensional and systemic approach. This proposal leads not only to a more explicit definition of exposure and vulnerable components, but also to the recognition of resources that—in the case of accidental events involving (directly or indirectly) data center infrastructures—may be implemented at different territorial levels as “protection” factors to ensure business continuity by considering the entire resilience cycle, from the prevention phase to the response and recovery phases.
    Keywords data centers ; territorial risks ; business continuity ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
    Subject code 333
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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  3. Article ; Online: Dissolution or Growth of a Liquid Drop via Phase-Field Ternary Mixture Model Based on the Non-Random, Two-Liquid Equation

    Andrea Lamorgese / Roberto Mauri

    Entropy, Vol 20, Iss 2, p

    2018  Volume 125

    Abstract: We simulate the diffusion-driven dissolution or growth of a single-component liquid drop embedded in a continuous phase of a binary liquid. Our theoretical approach follows a diffuse-interface model of partially miscible ternary liquid mixtures that ... ...

    Abstract We simulate the diffusion-driven dissolution or growth of a single-component liquid drop embedded in a continuous phase of a binary liquid. Our theoretical approach follows a diffuse-interface model of partially miscible ternary liquid mixtures that incorporates the non-random, two-liquid (NRTL) equation as a submodel for the enthalpic (so-called excess) component of the Gibbs energy of mixing, while its nonlocal part is represented based on a square-gradient (Cahn-Hilliard-type modeling) assumption. The governing equations for this phase-field ternary mixture model are simulated in 2D, showing that, for a single-component drop embedded in a continuous phase of a binary liquid (which is highly miscible with either one component of the continuous phase but is essentially immiscible with the other), the size of the drop can either shrink to zero or reach a stationary value, depending on whether the global composition of the mixture is within the one-phase region or the unstable range of the phase diagram.
    Keywords emulsions ; drops ; liquid–liquid phase transitions ; diffusion ; nonequilibrium thermodynamics ; Science ; Q ; Astrophysics ; QB460-466 ; Physics ; QC1-999
    Subject code 510
    Language English
    Publishing date 2018-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Triphase Separation of a Ternary Symmetric Highly Viscous Mixture

    Andrea Lamorgese / Roberto Mauri

    Entropy, Vol 20, Iss 12, p

    2018  Volume 936

    Abstract: We discuss numerical results of diffusion-driven separation into three phases of a symmetric, three-component highly viscous liquid mixture after an instantaneous quench from the one-phase region into an unstable location within the tie triangle of its ... ...

    Abstract We discuss numerical results of diffusion-driven separation into three phases of a symmetric, three-component highly viscous liquid mixture after an instantaneous quench from the one-phase region into an unstable location within the tie triangle of its phase diagram. Our theoretical approach follows a diffuse-interface model of partially miscible ternary liquid mixtures that incorporates the one-parameter Margules correlation as a submodel for the enthalpic (so-called excess) component of the Gibbs energy of mixing, while its nonlocal part is represented based on a square-gradient (Cahn⁻Hilliard-type) modeling assumption. The governing equations for this phase-field ternary mixture model are simulated in 3D, showing the segregation kinetics in terms of basic segregation statistics, such as the integral scale of the pair-correlation function and the separation depth for each component. Based on the temporal evolution of the integral scales, phase separation takes place via the simultaneous growth of three phases up until a symmetry-breaking event after which one component continues to separate quickly, while phase separation for the other two seems to be delayed. However, inspection of the separation depths reveals that there can be no symmetry among the three components at any instant in time during a triphase segregation process.
    Keywords spinodal decomposition ; liquid–liquid phase transitions ; diffusion ; nonequilibrium thermodynamics ; Science ; Q ; Astrophysics ; QB460-466 ; Physics ; QC1-999
    Subject code 612
    Language English
    Publishing date 2018-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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