Physica A: Statistical Mechanics and its Applications最新文献

{"title":"Adaptive multi-parameter constrained time-delay feedback tri-stable stochastic resonance combined with EEMD for rolling bearing fault diagnosis","authors":"Xiaoxiao Huang,&nbsp;Gang Zhang,&nbsp;Jiaqi Xu","doi":"10.1016/j.physa.2024.130334","DOIUrl":"10.1016/j.physa.2024.130334","url":null,"abstract":"<div><div>In this paper, we propose a method that combines Ensemble Empirical Mode Decomposition (EEMD) with a Multi-parameter Constrained Time-delay Feedback Tri-stable Stochastic Resonance (MCTFTSR) system. We discuss its performance for fault signal diagnosis characterized by non-stationarity, multi-components, and multi-interferences. Initially, we propose and study MCTFTSR system driven by Gaussian white noise and periodic signal. Following that, the equivalent potential function, steady-state probability density (SPD), mean first passage time (MFPT) and spectral amplification coefficient (SA) of MCTFTSR system are derived by using the small time-delay approximation. Next, we discuss the impact of parameters on MCTFTSR system from the perspectives of particle residence probability, transition and output characteristics. Subsequently, we employ numerical simulations to contrast the output performance of the MCTFTSR, MCTSR, and TFSTSR systems. The results indicate that, in comparison to the other two systems, MCTFTSR exhibits superior detection performance under various driving frequency signal, Gaussian noise and Levy noise. Additionally, we simulate faulty AM signal to assess the applicability and superior detection capabilities of the EEMD-MCTFTSR method. It is found that the method can enhance and extract the characteristics of AM signals, to identify faults effectively. Finally, the proposed method is applied to practical engineering and compared with the EEMD method, MCTFTSR method. Genetic algorithm (GA) is used to obtain the optimal parameter combination and ensure the most effective fault signal detection. In the inner ring fault diagnosis, the SNRI of the proposed method is 0.54 dB and 7.6 dB higher than that of EEMD and MCTFTSR, respectively, while in the outer ring fault diagnosis it is 3.02 dB and 8.05 dB higher. The results show that the EEMD-MCTFTSR method exhibits superior denoising and signal extraction capabilities compared to the other two methods, which further enhances the application of SR in bearing fault diagnosis.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130334"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hard rigid rods on Husimi lattices","authors":"Lucas R. Rodrigues ,&nbsp;Tiago J. Oliveira ,&nbsp;Jürgen F. Stilck","doi":"10.1016/j.physa.2025.130349","DOIUrl":"10.1016/j.physa.2025.130349","url":null,"abstract":"<div><div>We study the thermodynamic behavior of hard rigid rods of size <span><math><mi>k</mi></math></span> (i.e., <span><math><mi>k</mi></math></span>-mers) on four- and six-coordinated Husimi lattices (HLs), respectively built with squares (square HL) and triangles (triangular HL). In both lattices, dimers (<span><math><mrow><mi>k</mi><mo>=</mo><mn>2</mn></mrow></math></span>) and trimers (<span><math><mrow><mi>k</mi><mo>=</mo><mn>3</mn></mrow></math></span>) only present a isotropic phase, whereas a isotropic-nematic transition is observed for <span><math><mrow><mi>k</mi><mo>≥</mo><mn>4</mn></mrow></math></span>. In the square HL, this transition is continuous and occurs at a critical <em>monomer</em> activity which displays a nonmonotonic variation with <span><math><mi>k</mi></math></span>, while the critical <em>rod</em> activity and density are always decreasing functions of <span><math><mi>k</mi></math></span>. The isotropic-nematic transition is discontinuous in the triangular HL, but the <span><math><mi>k</mi></math></span>-dependence of the coexistence activities and density is analogous to that found for the square case. No transition from the nematic to a high-density disordered phase is found in these HLs. In general, this scenario is very similar to that already observed for rods on the Bethe lattice, though the critical parameters obtained her e are in most cases closer to those reported in the literature for the square and triangular lattices. The entropy per site of fully-packed rods is also investigated in detail in the triangular HL, where its value for dimers differs by only 0.7% from the exact result for the triangular lattice.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130349"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Time series analysis and stochastic processes modeling using explosive eruption data from Japan’s Sakurajima volcano","authors":"Ryuji Ishizaki ,&nbsp;Masayoshi Inoue ,&nbsp;Kazuhiro Fukushima","doi":"10.1016/j.physa.2024.130313","DOIUrl":"10.1016/j.physa.2024.130313","url":null,"abstract":"<div><div>This study examines the statistical properties of explosive eruptions at Japan’s Sakurajima volcano from 1955 to 2023. The investigation revealed that the distribution of eruption intervals conforms to a power-law distribution. Additionally, a Hurst exponent of approximately 0.81 was computed for the monthly average daily frequency of explosive eruptions. Based on these findings, it was determined that the occurrence of explosive eruptions of Sakurajima volcano over the period of study deviates from a Poisson process and exhibits characteristics of a non-stationary Poisson process influenced by prior explosive events. Subsequent modeling using the autoregressive integrated moving average (ARIMA) technique showed that the ARIMA(1,1,0) model provides an excellent fit to the observed data.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130313"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study of pedestrian dynamics and crowd risk on ramps","authors":"Zhijian Fu ,&nbsp;Shengxian Yang ,&nbsp;Lin Luo ,&nbsp;Jian Li ,&nbsp;Xiaobo Liu","doi":"10.1016/j.physa.2024.130345","DOIUrl":"10.1016/j.physa.2024.130345","url":null,"abstract":"<div><div>This study investigates pedestrian dynamics and crowd risk on ramps, a topic not fully explored in previous research. Our experimental setup covers a boarder range of densities for both walking and running scenarios. Our main findings include: (1) Once pedestrian density exceeds 1.70ped/m², flow rates continue to increase and remain consistently higher during ascending the ramp compared to descending, a trend not observed on level ground. This phenomenon can be explained by step behavior mechanisms, driven by the transition from two to three lanes, which help maintain consistent headway and step lengths. (2) The addition of walking lanes increases velocity curl (i.e., local spinning motion) on the ascending segment, especially in running scenarios. When combined with the high-density levels typically seen in ascending movement, these effects amplify crowd danger. Statistical analyses confirm crowd risks are more strongly correlate with movement directions (descending vs. ascending) than with movement speeds (walking vs. running).</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130345"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Macro guidance-Micro avoidance model for on-site personnel emergency evacuation strategy in nuclear power plants under fear psychology","authors":"Zelin Nie ,&nbsp;Yuxin Guan ,&nbsp;Wei Cheng ,&nbsp;Lingxiu Chen ,&nbsp;Ji Xing ,&nbsp;Xuefeng Chen ,&nbsp;Na Xue ,&nbsp;Jin Yan ,&nbsp;Wei Deng ,&nbsp;Qun Cao","doi":"10.1016/j.physa.2025.130366","DOIUrl":"10.1016/j.physa.2025.130366","url":null,"abstract":"<div><div>At present, the measures for on-site emergency in nuclear power plants are not universal and flexible, and are not applicable to all accident scenarios. To address the problem, this paper proposes a Macro guidance-Micro avoidance model combined improved Non-dominated Sorting Genetic Algorithm-II (NSGA-II) and Cellular Automata (CA) model for on-site emergency. To overcome the issue of “repeated turnback” in CA micro-simulation, the improved NSGA-II algorithm is introduced to guide macro evacuation directions. For addressing uncertainty in the effects of radiation field, psychological factors, and evacuation behavior on evacuation efficiency in nuclear emergency scenarios, CA is used to simulate and analyze the influence rule of radiation field, herd behavior, information transmission, and physical differences on evacuation time. Finally, by selecting appropriate exit inside nuclear power plant, this model reasonably estimates evacuation time, and ensures timely response of off-site emergency vehicles during the nuclear emergency process. Through the simulation analysis of evacuation process of on-site personnel based on radionuclide diffusion, radiation hazards, crowd characteristics, and psychological changes can be considered, this approach facilitates the planning of safe evacuation exits and allows for more accurate evacuation time estimation, supporting subsequent off-site evacuation efforts.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130366"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-scale wavelet transform enhanced graph neural network for pedestrian trajectory prediction","authors":"Xuanqi Lin,&nbsp;Yong Zhang,&nbsp;Shun Wang,&nbsp;Yongli Hu,&nbsp;Baocai Yin","doi":"10.1016/j.physa.2024.130319","DOIUrl":"10.1016/j.physa.2024.130319","url":null,"abstract":"<div><div>The pedestrian trajectory prediction forecasts future positions by analyzing historical data and environmental context. With the rapid advancement of artificial intelligence and data processing technologies, this technique has become increasingly significant in areas such as autonomous driving, video surveillance, and intelligent transportation systems. Traditional deep learning methods have primarily focused on time-domain modeling and have made great success. However, they struggle to capture multi-scale features and frequency-domain information in trajectories, making it challenging to effectively handle noise and uncertainty in trajectory data. To address these limitations, this paper proposes a Multi-Scale Wavelet Transform Enhanced Graph Neural Network (MSWTE-GNN) based on wavelet transform and multi-scale learning. The model processes trajectory sequences in the frequency domain using wavelet transform, extracting multi-scale features, and integrates multi-scale graph neural networks with cross-scale fusion to learn interaction information among pedestrians. Experimental results demonstrate that the proposed method significantly improves the accuracy and reliability of pedestrian trajectory prediction.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130319"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Skyrmions in dynamic magnetic field: Hysteresis behavior","authors":"Aymila Akyıldız ,&nbsp;Ümit Akıncı","doi":"10.1016/j.physa.2024.130332","DOIUrl":"10.1016/j.physa.2024.130332","url":null,"abstract":"<div><div>The behavior of the skyrmionic character of the square lattice with the Heisenberg model which contains exchange interaction and DMI between the nearest neighbor spins and external time-dependent periodic magnetic field is investigated by Monte Carlo simulation. The effect of the amplitude and period of the field on the skyrmionic character of the lattice was obtained. It is shown that, as in the magnetization of the lattice, the skyrmion number has a hysteretic character in one period of the field.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130332"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Time-resolved culture maps derived from the Integrated Values Survey data (1981–2022)","authors":"John Lawrence Euste ,&nbsp;Hannah Christina Arjonillo,&nbsp;Caesar Saloma","doi":"10.1016/j.physa.2024.130317","DOIUrl":"10.1016/j.physa.2024.130317","url":null,"abstract":"<div><div>We demonstrate a method for deriving pairs of time-resolved two-dimensional [vertical <em>traditional (bottom) - rational</em> axis vs. horizontal <em>survival (left) – self-expression</em> axis] culture maps from the Integrated Values Survey data (IVS) which is an integration of the World Values Survey (WVS) and European Values Survey data. The IVS is composed of seven survey waves (average duration: 5.43 years) that were successively sampled from 1981 (start of Survey Wave 1) to 2022 (end of Wave 7). A pair consisting of a cross-country map and a survey respondent-level map is extracted from each wave via principal component analysis (PCA). In the cross-country map, countries are represented as points, while in the respondent-level map of a country, the survey respondents are depicted as points distributed about a mean location. The coefficient matrix from the country-level PCA is utilized to derive the respondent-level map. The cross-country map reveals the cultural variations of the participating countries while the respondent-level map of a country shows the variations of its national population as represented by the randomly selected respondents. The information content of each map is unique and complementary. We derived the connection between the mean location of the respondent distribution of a country and its corresponding location in the cross-country map. Tracking the temporal movements of country locations from 1981 to 2022 in the cross-country maps revealed that countries have generally moved towards the <em>self-expression</em> direction. We calculated the associated standard deviational ellipse (SDE) of the respondent distribution and used the SDE area as a measure of the degree of intra-national cultural diversity. We have observed that countries with lower degrees of cultural diversity (i.e., smaller SDE areas) placed greater emphasis on traditional and survival values. The capability to measure accurately the temporal evolution of national cultures allows peoples to understand each other better thereby avoiding costly conflicts between nationalities and countries.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130317"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconstructing functional networks of air transport delay propagations with minimal information","authors":"Massimiliano Zanin","doi":"10.1016/j.physa.2024.130318","DOIUrl":"10.1016/j.physa.2024.130318","url":null,"abstract":"<div><div>In the last decade, statistical physics has joined the effort of the scientific community in the endeavour of understanding the structure and dynamics of air transport delay propagation, especially through the reconstruction and analysis of functional networks. While being a powerful instrument, such networks rely on the availability of large quantities of real data, and can only be used to describe historical dynamics. This contribution presents an alternative way of analysing public delay data, based on minimal information and a set of hypotheses about why and where observed delays had to be generated. We show how this analysis allows recovering known behaviours of the system, as the dependence of delays on the saturation of the arrival airport; but also how local and network propagation patterns can be detected ahead of time.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130318"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recovery of contour nodes in interdependent directed networks","authors":"Ignacio A. Perez,&nbsp;Cristian E. La Rocca","doi":"10.1016/j.physa.2024.130335","DOIUrl":"10.1016/j.physa.2024.130335","url":null,"abstract":"<div><div>Extensive research has focused on studying the robustness of interdependent non-directed networks and the design of mitigation strategies aimed at reducing disruptions caused by cascading failures. However, real systems such as power and communication networks are directed, which underscores the necessity of broadening the analysis by including directed networks. In this work, we develop an analytical framework to study a recovery strategy in two interdependent directed networks in which a fraction <span><math><mi>q</mi></math></span> of nodes in each network have single dependencies with nodes in the other network. Following the random failure of nodes that leaves a fraction <span><math><mi>p</mi></math></span> intact, we repair a fraction of nodes that are neighbors of the giant strongly connected component of each network with probability or recovery success rate <span><math><mi>γ</mi></math></span>. Our analysis reveals an abrupt transition between total system collapse and complete recovery as <span><math><mi>p</mi></math></span> is increased. As a consequence, we identify three distinct phases in the <span><math><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo></mrow></math></span> parameter space: collapse despite intervention, recovery enabled by the strategy, and resilience without intervention. Moreover, we demonstrate our strategy on a system built from empirical data and find that it can save resources compared to a random recovery strategy. Our findings underscore the potential of targeted recovery strategies to enhance the robustness of real interdependent directed networks against cascading failures.</div></div>","PeriodicalId":20152,"journal":{"name":"Physica A: Statistical Mechanics and its Applications","volume":"659 ","pages":"Article 130335"},"PeriodicalIF":2.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}