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227 results on '"Cassi D"'

55. Autocatalytic reaction-diffusion processes in restricted geometries

Author

Agliari, E., Burioni, R., Cassi, D., Neri, F. M., Università degli Studi di Parma, and Universität Leipzig

Subjects
diffusion, transport, Statistical Mechanics (cond-mat.stat-mech), FOS: Physical sciences, ddc:530, Condensed Matter - Statistical Mechanics
Abstract

We study the dynamics of a system made up of particles of two different species undergoing irreversible quadratic autocatalytic reactions: $A + B \to 2A$. We especially focus on the reaction velocity and on the average time at which the system achieves its inert state. By means of both analytical and numerical methods, we are also able to highlight the role of topology in the temporal evolution of the system.

Published
2007

58. Holistic Learning: Seeking a Purposeful Life By Engaging Science and the Humanities

Author

Chamberlin, Stacy, Konopasek, Cassi D., Chamberlin, Stacy, and Konopasek, Cassi D.

Abstract

Scientific research begins as a focused inquiry that leads to answers and then progresses to further questions. Engaging in scientific research that is not cookbook science, or completely planned, provides an opportunity to explore a critical way of thinking and develops an acceptance of uncertainty and an appreciation for the mystery of life. Science has the potential to influence a person to be critical of their sources and have the confidence to challenge everything they learn, for the purpose of being an interactive learner, and bring their sources into conversation with one another. From discussion"based science curriculum, students come to consider information learned as knowledge contributing to an always developing whole picture rather than a concrete final answer. Through a discussion engaging scientific experience and exposure to the humanities dialogue, the author witnessed the interconnectedness of the two different ways of thinking and considered the contribution of both essential in discerning purpose. Blending science and the humanities core curriculum enhances holistic learning because it encourages the metaphysical and material dialogue in seeking a purposeful life.

Published
2012

61. Spectral partitions on infinite graphs

Author

Burioni, R, Cassi, D, Destri, C, DESTRI, CLAUDIO, Burioni, R, Cassi, D, Destri, C, and DESTRI, CLAUDIO

Abstract

Statistical models on infinite graphs may exhibit inhomogeneous thermodynamic behaviour at macroscopic scales. This phenomenon is of a geometrical origin and may be properly described in terms of spectral partitions into subgraphs with well defined spectral dimensions and spectral weights. These subgraphs are shown to be thermodynamically homogeneous and effectively decoupled.

Published
2000

90. The generalized Peierls-Landau instability: a novel perspective on the nature of glasses?

Author

Fontana, M.P., Burioni, R., and Cassi, D.

Subjects
GLASS, LATTICE theory, THERMODYNAMICS, CRYSTALLINE polymers
Abstract

In this paper we discuss the implications of a recent generalization of the well-known Peierls-Landau instability for low-dimensional crystalline lattices to a wide class of structurally disordered networks. We give a general thermodynamic interpretation of structural instabilities in disordered inhomogeneous systems and discuss the relevance of our results to the fundamental phenomenology of glasses. [ABSTRACT FROM AUTHOR]

Published
2004
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97. T enhancement in inhomogeneous superconductors and fractal dynamics.

Author

Fontana, M. and Cassi, D.

Abstract

In this letter we propose a possible general mechanism of T enhancement in nonhomogeneous superconductors in terms of the anomalies of electron-phonon dynamics in fractal systems. The high- T superconductivity in oxyde ceramics is interpreted within such framework. [ABSTRACT FROM AUTHOR]

Published
1989
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100. The robustness of the photosynthetic system I energy transfer complex network to targeted node attack and random node failure

Author

Bellingeri, M, Montepietra, D, Cassi, D, and Scotognella, F

Abstract

In this article, we implement and compare 10 node removal (attack) strategies from the literature over the photosystem I (PSI) complex network of the common pea plant (Pisum sativum), representing the FRET energy transfer among its nodes/chromophores. We measure the network robustness (functioning) with four indicators. The node attack strategies and the network robustness indicators consider both the binary-topological and the weighted structure of the network. First, we find that the well-known node betweenness centrality attack, which has proven highly effective in dismantling most real-world networks’ topological connectivity, is ineffective over the PSI network. Second, the degeneracy of the node properties caused by the PSI’s higher network connectivity level induces a random-like node removal even when nodes are removed according to a specific node centrality measure. This phenomenon triggers a very low decrease of the PSI network functioning even when subjected to node attack. Such an outcome would indicate that the node attack strategies based on classic node properties, such as the degree or the betweenness centrality, may show low efficacy in dismantling real-world networks with very high connectivity levels.Last, the PSI network can be built by tuning a cut-off distance (CD) that defines the viable energy transfers among nodes/chromophores and progressively discards the lower energy transfer links among distant nodes/chromophores. This represents a ‘weight thresholding’ procedure allowing us to investigate the efficacy of the node attack strategies when links of lower weight are progressively pruned from the PSI network. We find that the best node attack strategies change by decreasing the CD, showing that the weight thresholding procedure affects the network response to node removal. This last outcome outlines the importance of investigating the stability of the system response for real-world weighted complex networks subjected to the weight thresholding procedure.

Published
2022
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