The European Physical Journal B最新文献

{"title":"Frequency-dependent synchronization in blinking networks: insights from Hindmarsh–Rose, Lorenz, and Rössler systems","authors":"Xianchen Wang,&nbsp;Zhen Wang,&nbsp;Shihong Dang,&nbsp;Jiaxin Dai","doi":"10.1140/epjb/s10051-025-01015-z","DOIUrl":"10.1140/epjb/s10051-025-01015-z","url":null,"abstract":"<p>This study examines how the temporal structure of network couplings affects synchronization, a fundamental phenomenon in numerous real-world systems. Focusing on blinking networks, a class of time-varying networks where couplings periodically switch on and off, we compare two distinct blinking schemes across three canonical dynamical systems: the Hindmarsh–Rose, Lorenz, and Rössler systems. Using the Master Stability Function (MSF) framework, we reveal a striking contrast in synchronization behavior. When all couplings are activated simultaneously during the same portion of the blinking period, the system’s synchronization stability remains unaffected by the blinking frequency, closely resembling that of an averaged static network characterized by a linear MSF profile. In contrast, when couplings are activated sequentially within each blinking period, this linear MSF pattern emerges only at high blinking frequencies (fast blinking). At lower frequencies (slow blinking), the MSF exhibits diverse, system-specific patterns. Notably, the linear MSF pattern ensures the emergence of synchronization irrespective of the underlying structural properties. Thus, these findings offer new insights into how the temporal organization of couplings governs collective dynamics in time-varying networks, particularly in contexts where the emergence and stability of synchronization are critical.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"A comparative study for polymer liquid mixture of poly(ethylene glycol) methyl ether methacrylate-475 with alkoxyethanol using thermoacoustical, simulations and spectroscopy tools","authors":"Ajaz Hussain,&nbsp;Laxmi Kumari,&nbsp;Shushant Shukla,&nbsp;Leena Sinha,&nbsp;Onkar Prasad","doi":"10.1140/epjb/s10051-025-01012-2","DOIUrl":"10.1140/epjb/s10051-025-01012-2","url":null,"abstract":"<div><p>To predict the intermolecular interface amid polymer liquid mixture of poly ethylene glycol methyl ether methacrylate 475 (PEGMA475) with alkoxyethanol, the density (<i>ρ)</i> and ultrasonic velocity (<i>u</i>) have been measured over entire composition range at different temperatures (293.15 K, 303.15 K, and 313.15 K). Further, UV–visible, FT-IR spectroscopy and quantum chemical (density functional theory) simulations of polymeric systems were also performed using super computer to get deep insight of the intermolecular association. These findings were compared with the molecular dynamics simulations using OCTA based J-OCTA multi-scale simulator. The outcomes of molecular dynamics simulations were found to be in agreement with experimental thermo-acoustical and spectroscopic studies, along with theoretical DFT predictions as well.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Boosting the photocatalytic hydrogen production via the S/Zr co-doping in a CaTiO3 perovskite: first-principles study of the optoelectronic, thermodynamic, and photocatalytic","authors":"Abdellah Bouzaid,&nbsp;Younes Ziat,&nbsp;Hamza Belkhanchi,&nbsp;Hmad Fatihi","doi":"10.1140/epjb/s10051-025-01004-2","DOIUrl":"10.1140/epjb/s10051-025-01004-2","url":null,"abstract":"<div><p>Recent advancements in photocatalysis research have mostly concentrated on the development of effective materials to enhance water splitting and the production of hydrogen. This work used density functional theory (DFT) to investigate the structural, optoelectronic, thermodynamic characteristics, and redox band edges of undoped and (S, Zr) co-doped CaTiO₃. The initial structural optimization results indicate that undoped and (S, Zr) co-doped CaTiO₃ have negative formation energies, signifying their thermodynamic stability. Furthermore, thermodynamic analysis indicates a significant change in the Grüneisen parameter, Debye temperature, entropy, and heat capacities due to co-doping, showing the change of lattice anharmonicity and vibrational characteristics with variations in temperature and pressure. Optoelectronic calculations show that undoped CaTiO₃ has an indirect band gap of 2.77 eV. In contrast, co-doping with S and Zr results in direct band gaps of 2.22 eV for <span>({{text{Ca}}_{8}text{Ti}}_{7}{text{Zr}}_{1}{text{O}}_{23}{text{S}}_{1})</span> and 1.85 eV for <span>({{text{Ca}}_{8}text{Ti}}_{6}{text{Zr}}_{2}{text{O}}_{22}{text{S}}_{2})</span>, which reduces the band gap and enhances visible light absorption and optical conductivity. Furthermore, the analysis of the valence and conduction band edge positions (<i>E</i>_VB and <i>E</i>_CB) of Zr- and S-co-doped CaTiO₃ indicates that the material satisfies the thermodynamic requirements for water splitting, underscoring its potential as an efficient photocatalyst. Notably, the observed variations in electronic and thermodynamic properties with increasing dopant concentration reveal a nonlinear trend, suggesting a complex interplay between dopant interactions and host lattice distortions. These findings suggest that co-doped materials exhibit promising properties for renewable energy applications, particularly solar-driven photocatalytic hydrogen production, photovoltaic devices, and optoelectronics, due to their enhanced visible light absorption.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Ordered and disordered skyrmion states on a square substrate","authors":"J. C. Bellizotti Souza,&nbsp;C. J. O. Reichhardt,&nbsp;C. Reichhardt,&nbsp;N. P. Vizarim,&nbsp;P. A. Venegas","doi":"10.1140/epjb/s10051-025-01010-4","DOIUrl":"10.1140/epjb/s10051-025-01010-4","url":null,"abstract":"<p>We examine the ordering of skyrmions interacting with a square substrate created from a modulation of anisotropy using atomistic simulations. We consider fillings of <i>f</i> = 1.5, 2.0, 2.5, 3.0, and 3.5 skyrmions per potential minimum as a function of magnetic field and sample size. For a filling of <i>f</i> = 2.0, we find various dimer orderings, such as tilted dimer states, as well as antiferromagnetic ordering that is similar to the colloidal dimer ordering seen on square substrates. The ability of the skyrmions to change shape or annihilate produces additional states that do not occur in the colloidal systems. For certain parameters at <i>f</i> = 2.0, half of the skyrmions can annihilate to form a square lattice, or a superlattice of trimers and monomers containing skyrmions of different sizes can form. At lower fields, ordered stretched skyrmion states can appear, and for zero field, there can be ordered stripe states. For <i>f</i> = 3.0, we find ferromagnetic ordered trimers, tilted lattices, columnar lattices, and stretched phases. For fillings of <i>f</i> = 1.5 and 2.5, we find bipartite lattices, different ordered and disordered states, and several extended disordered regions produced by frustration effects.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Analysis of induced magnetic field effect on the stagnation point flow dynamics of buoyancy-driven blood-based hybrid nanofluid with inertial drag","authors":"S. Mohanty,&nbsp;S. R. Mishra,&nbsp;Subhajit Panda","doi":"10.1140/epjb/s10051-025-01008-y","DOIUrl":"10.1140/epjb/s10051-025-01008-y","url":null,"abstract":"<div><p>For the enhanced thermal conductivity and stability, blood-based hybrid nanofluids have gained their significant role in biomedical engineering, drug delivery, etc. The proposed study analyzes the role of an induced magnetic field on the stagnation point flow of blood-based hybrid nanofluid comprised of CuO and Cu nanoparticles. The flow phenomena are enhanced for the incorporation of Darcy-Forchheimer inertial drag, thermal buoyancy, and heat source effects. The mathematical model is projected for the proposed phenomena are transmuted into non-dimensional form by the utilization of similarity rules, and then a numerical method is employed for the solution of the system. In particular, due to the unavailability of the requisite initial conditions shooting method is used to get the unknown initial guess values and further Runge–Kutta fourth-order technique is employed for the solution of the system of transformed equations. The behavior of the physical quantities is presented via graphs. The major outcomes of the study are elaborated as: the induced current enhances fluid velocity, while reciprocal magnetization strengthens the magnetic profile. Permeability-induced resistivity and inertial drag reduce velocity, whereas greater thermal conductivity in hybrid nanofluids offsets density effects. Thermal radiation boosts heat transport, permeability and inertial drag increase shear rate, but thermal buoyancy decelerates the profile.</p><h3>Graphical abstract</h3><p>\u0000The study aims to investigate the stagnation point flow of a blood-based CuO+Cu hybrid nanofluid under the influence of induced magnetization, which holds significant relevance in biomedical applications. A comprehensive mathematical model is developed to incorporate radiant heat, thermal buoyancy, and internal heat sources, enhancing understanding of hybrid nanofluid behavior in complex environments. The inclusion of Darcy–Forchheimer inertial drag in a porous medium offers a more realistic portrayal of fluid resistance, improving the fidelity of nanofluid flow simulations. The combined effects of heat source and radiation on the free convection characteristics of the hybrid nanofluid are analyzed, emphasizing their role in thermal regulation systems. The optimized thermal transport characteristics of the hybrid nanofluid demonstrate potential in drug delivery, biomedical cooling, and other bio-thermal engineering applications.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Utilizing data mining techniques for the design of structural and mechanical properties of ABX3 perovskites","authors":"Wissem Benaissa,&nbsp;Fatiha Saidi,&nbsp;Khadidja Rahmoun","doi":"10.1140/epjb/s10051-025-00999-y","DOIUrl":"10.1140/epjb/s10051-025-00999-y","url":null,"abstract":"<div><p>The unique structural and physical properties of ABX₃-type perovskite compounds have made them central to the development of advanced materials, with potential applications across a wide range of scientific and industrial domains. This work explores the physical and mechanical characteristics of perovskite materials through the application of advanced data mining methodologies to uncover hidden correlations and patterns within large datasets. Principal component analysis (PCA) and partial least squares regression (PLS), as data mining techniques, are employed to investigate and forecast the correlations between the structural and mechanical properties of the materials, specifically focusing on hardness, rigidity, and ductility. The main objective is to identify perovskite compounds with optimal mechanical performance, particularly those with high hardness and rigidity, while maintaining appreciable ductility. In addition, the study highlights the value of multivariate modeling combined with empirical rules to better understand the formability of oxide perovskite structures (ABO₃). This approach not only enhances the analysis of existing compounds but also enables the prediction of new perovskite materials with promising properties. This approach not only enhances the analysis of existing compounds but also enables the prediction of new perovskite materials with promising properties. The predictions made in this study are quantitatively validated by comparison with existing experimental and theoretical data, as shown in Table 2, providing a preliminary confirmation of the model’s reliability while laboratory validation remains a future objective. Ultimately, these data-driven techniques provide a pathway for accelerating the identification and optimization of high-performance perovskites, reducing the dependency on extensive laboratory experimentation.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"A phenomenological theory for the double-peak structure in the specific heat of CeRu(_{2})Si(_{2})","authors":"Kazuyuki Matsumoto","doi":"10.1140/epjb/s10051-025-01002-4","DOIUrl":"10.1140/epjb/s10051-025-01002-4","url":null,"abstract":"<p>The double-peak structure observed in the specific heat of CeRu<span>(_{2})</span>Si<span>(_{2})</span> is explained by a phenomenological theory with free energy density expansion by entropy deviation within the first and third order. We minimize this free energy density with respect to the entropy deviation and obtain the specific heat of CeRu<span>(_{2})</span>Si<span>(_{2})</span>. The critical behavior of the specific heat as a function of the external magnetic field is also obtained within this theory. However, since this critical behavior would be an artifact of the mean-field theory, this criticality should be weakened in a desirable theory. Compared with an experiment, the temperature dependence of the peak value of the specific heat is also determined.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Adaptive learning of prediction and simulation on the influence of Fe thickness on the energy gap of ZnO/Fe/ZnO tri-layer thin films","authors":"R. A. Mohamed,&nbsp;E. Baradács,&nbsp;H. E. Atyia,&nbsp;P. Pál,&nbsp;M. Y. El-Bakry,&nbsp;G. Katona,&nbsp;S. S. Fouad,&nbsp;Z. Erdélyi","doi":"10.1140/epjb/s10051-025-00995-2","DOIUrl":"10.1140/epjb/s10051-025-00995-2","url":null,"abstract":"<div><p>This work focuses on the investigation of the effect of Iron (Fe) interlayer thickness, on the experimental, simulation and prediction of the optical energy gap of ZnO/Fe/ZnO tri-layer thin films. The optical properties and the modeling were studied by varying the Fe interlayer thickness from 20 to 80 nm. The tri-layer thin films were successfully fabricated using atomic layer deposition for the ZnO layers and direct current magnetron sputtering unit for Fe layers. The optical transmission in the range of 400–2500 nm has been studied to determine the variation of absorption coefficient (<i>α</i>) and optical gap <span>(({E}_{text{g}}))</span> of the investigated thin films. The appearance of ZnO/Fe/ZnO system as a Fabry–Pérot “interference filter” is consistent with the optical transmission curves. Adaptive neuro-fuzzy inference system (ANFIS) was utilized for simulation and prediction based on experimental data. Using ANFIS enabled the prediction of the transmittance of different Fe interlayer thicknesses for the unmeasured values. The <i>E</i>_g, showed a noticeable dependence on the Fe layer thickness, where a significant reduction decreasing from 2.45 to 1.75 eV was observed, which has been attributed to the increase of the metallicity, while the metallization criterion on the basis of <i>E</i>_g showed a decreasing trend from 0.35 to 0.312, which suggests potential applications for nonlinear optics. The evaluating mean squared error of the ANFIS model was indicating the positive influence of the used model. Therefore, modeling approach has computational efficiency and flexibility that provides a rapid and reliable technique to investigate the impact of Fe thickness on the energy gap of ZnO/Fe/ZnO tri-layer thin films.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Exploration of pressure-induced superconductivity in CuSe-based compounds under high pressure","authors":"Ryo Matsumoto,&nbsp;Sayaka Yamamoto,&nbsp;Shintaro Adachi,&nbsp;Hiromi Tanaka,&nbsp;Toru Shinmei,&nbsp;Tetsuo Irifune,&nbsp;Yoshihiko Takano","doi":"10.1140/epjb/s10051-025-00993-4","DOIUrl":"10.1140/epjb/s10051-025-00993-4","url":null,"abstract":"<div><p>The replacement of conducting layers in known layered superconducting compounds is a significant challenge in the search for novel superconductors. In particular, the exploration of superconductors can be accelerated by combining the application of high pressure for modifying the crystal structure. In this study, we investigate the electrical transport properties of the layered CuSe-based compound BiOCuSe, which has the same structure as the 1111-type iron-based superconductor La(O,F)FeAs, under high pressure exceeding 80 GPa. In addition, as related CuSe-based compounds, the electrical properties of YBi₂O₄Cu₂Se₂ and Cu₂Se are measured under high pressure. Although no clear signatures of bulk superconductivity are observed in these CuSe-based compounds, filamentary superconductivity emerges in BiOCuSe and Cu₂Se. Given the rapid advancements in high-pressure techniques in recent years, further exploration of high-pressure effects on layered materials with novel conducting layers is expected to lead to the discovery of next-generation superconducting materials.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00993-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145143738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Asymmetric coupling and nonlinear resonance in coupled anharmonic oscillators","authors":"Abirami Karunanidhi,&nbsp;Mohanasubha Ramasamy,&nbsp;Ruby V. Chithiika,&nbsp;Karthikeyan Rajagopal","doi":"10.1140/epjb/s10051-025-00926-1","DOIUrl":"10.1140/epjb/s10051-025-00926-1","url":null,"abstract":"<p>Bidirectional coupling with unequal strengths in a nonlinear system leads to complex and diverse dynamics. In this work, we investigate the emergence of resonance in a system of bidirectionally coupled Duffing oscillators with different coupling strengths in each direction, treating these asymmetric coupling strengths as control parameters. Using a theoretical approach, we derive frequency response relations for a system of two Duffing oscillators coupled bidirectionally with distinct coupling strengths. Notably, both oscillators exhibit a resonance peak in the response amplitude curve under a weak periodic input signal. The validity of our theoretical expressions is confirmed through numerical simulations. Furthermore, we examine the effects of asymmetric interactions between the two oscillators. Our results show that the resonance behavior of each oscillator emerges with a monotonic increase in either of the coupling strengths. Additionally, we analyze how system parameters, along with the two coupling strengths, influence the response amplitude. Finally, we find that as the coupling strengths vary, the system exhibits hysteresis phenomena in both oscillators.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}