Iskanje po katalogu digitalne knjižnice

Opis: Understanding the high-pressure phase behavior of carbon dioxide-hydrocarbon mixtures is of considerable interest owing to their wide range of applications. Under certain conditions, these systems are not amenable to direct visual monitoring, and experimentalists often rely on spectrophotometric data to infer phase behavior. Consequently, developing computationally efficient and robust methods to leverage such data is crucial. Here, we combine nearest neighbor permutation entropy, computed directly from in situ near-infrared absorbance spectra acquired during depressurization trials of mixtures of carbon dioxide and a distilled petroleum fraction, with an anomaly detection approach to identify phase transitions. We show that changes in nearest neighbor entropy effectively signal transitions from initially homogeneous mixtures to two-phase equilibria, thereby enabling accurate out-of-sample online predictions of transition pressures. Our approach requires minimum data preprocessing, no specialized detection techniques or visual inspection of the spectra, and is sufficiently general to be adapted for studying phase behavior in other high-pressure systems monitored via spectrophotometry.
Ključne besede: nearest neighbors, permutation entropy, phase transition, complex system, social physics
Objavljeno v DKUM: 04.07.2025; Ogledov: 0; Prenosov: 0
Celotno besedilo (3,19 MB)
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Opis: The article defines radicalisation as part of the processes of modern liberation, which are recognised in the interlacement of emancipatory potential in social pedagogy and mobilisation in the theory of community development. In parallel to this, we problematise the internally divided socio-pedagogical attitude, which, on the one hand, seeks to liberate, and on the other hand, is repeatedly caught in the preservation of existing "oppressive" power relations. In doing so, we consider the concerns regarding political action as the goal of "radicalising" social pedagogy, which indicate that in social pedagogy we have internalized collaboration as a democratic "norm" of solving social and other societal issues and thus accepted it as the only formally realistic option to achieve structural change.
Ključne besede: emancipatory potential, mobilisation dimension, liberation practices, radicalisation, social pedagogy
Objavljeno v DKUM: 30.06.2025; Ogledov: 0; Prenosov: 0
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Opis: Rumors in social systems are omnipresent. While traditional models focus on pairwise interactions, the collective effects of group interactions are insufficiently explored. Here we present a rumor propagation model on higher-order networks that incorporates 2-simplex structures and adaptive transitions between active and passive individuals. We find that higher-order networks substantially lower the propagation threshold and intensify nonlinear spreading effects. Active individuals are key drivers of rumor propagation and persistence. With active contagion, we observe that higher-order propagation increases peak and steady-state densities of active spreaders, thus extending the propagation and lifespan of rumors. We also apply a sequential quadratic programming algorithm to optimize the parameters of our model and validate its accuracy and applicability on real-world data. These results advance our understanding of contagion in higher-order social networks and support the design of targeted strategies for rumor mitigation.
Ključne besede: rumor propagation, activity contagion, higher-order networks, social physics
Objavljeno v DKUM: 24.06.2025; Ogledov: 0; Prenosov: 0
Celotno besedilo (2,85 MB)
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Opis: The research presented in this paper aims to determine to what extent hotels in Serbia use social media components on their websites. A total of 378 hotel websites in the Republic of Serbia were analysed. For each analysed hotel, the following attributes were observed: region, category, type, and size of the establishment, while the presence of valid links to social networks, the presence of a blog, Google Map, or a link to it, and the number of versions of the site in a foreign language were analysed on their websites. Descriptive statistics and the chisquare test were applied in data processing. The research has shown that hotels in Serbia insufficiently use social media components on their websites. These findings can be useful for hotels as they may indicate ways to improve their websites.
Ključne besede: hotel website, website analysis, social media, hotels, Serbia
Objavljeno v DKUM: 02.06.2025; Ogledov: 0; Prenosov: 0
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Opis: Criminal activities are predominantly due to males, with females exhibiting a significantly lower involvement, especially in serious offenses. This pattern extends to organized crime, where females are often perceived as less tolerant to illegal practices. However, the roles of males and females within corruption networks are less understood. Here, we analyze data from political scandals in Brazil and Spain to shed light on gender differences in corruption networks. Our findings reveal that females constitute 10% and 20% of all agents in the Brazilian and Spanish corruption networks, respectively, with these proportions remaining stable over time and across different scandal sizes. Despite this disparity in representation, centrality measures are comparable between genders, except among highly central individuals, for which males are further overrepresented. Additionally, gender has no significant impact on network resilience, whether through random dismantling or targeted attacks on the largest component. Males are more likely to be involved in multiple scandals than females, and scandals predominantly involving females are rare, though these differences are explained by a null network model in which gender is randomly assigned while maintaining gender proportions. Our results further reveal that the underrepresentation of females partially explains gender homophily in network associations, although in the Spanish network, male-to-male connections exceed expectations derived from a null model.
Ključne besede: gender disparity, corruption network, political scandal, social physics, social physics
Objavljeno v DKUM: 25.04.2025; Ogledov: 0; Prenosov: 0
Celotno besedilo (3,50 MB)
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