The European Physical Journal B最新文献

{"title":"Bifurcation analysis and control of a modified continuum traffic flow model considering mixed motor vehicles and bicycles","authors":"WenHuan Ai,&nbsp;JianLi Fu,&nbsp;JingMing Zeng,&nbsp;DaWei Liu","doi":"10.1140/epjb/s10051-025-00898-2","DOIUrl":"10.1140/epjb/s10051-025-00898-2","url":null,"abstract":"<div><p>In urban studies, issues with traffic flow have always been a popular topic. We explore the propagation traits and evolution law of traffic flow, which can serve as a theoretical foundation for the planning and management of road traffic, starting with the theory of traffic flow bifurcation. We suggest a macroscopic traffic model that takes into account the frictional and obstructive disturbance based on the influence of traffic flow mixed motor vehicles and bicycles. The influence of vehicle speed, density, speed differential, and other parameters on the evolution law of macroscopic traffic flow is investigated by bifurcation analysis. From the viewpoint of the overall stability of the traffic system, the non-linear bifurcation theory is also employed to describe the non-linear traffic phenomena on the traffic flow of mixed motor vehicles and bicycles. The findings indicate that when a blocking disturbance is certain, the unstable region of the traffic flow gradually expands as non-motorized traffic flow increases, and when a frictional disturbance is certain, the unstable region of the traffic flow gradually expands as the blocking disturbance's duration gradually lengthens. It has been discovered that the nonlinear model can accurately capture the phenomenon of mixed motor vehicles and bicycles in the traffic flow through the analysis of the equilibrium point and local bifurcation. Finally, this paper suggests a non-linear feedback controller that delays or prevents the emergence of bifurcation points when added to the model. This controller serves as a theoretical foundation for future research on the impact of mixed motor vehicles and bicycles on the operational characteristics of traffic flow. Through simulation of density-time and phase plane diagrams, the model is confirmed to be able to describe the phenomena of traffic congestion and stopping in real traffic, providing a theoretical foundation for the mitigation of traffic congestion.</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 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749235","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":"The role of predictive effect in lattice model incorporating traffic jerk effect","authors":"Daljeet Kaur,&nbsp;Sandra C Unni,&nbsp;Mohit Yadav","doi":"10.1140/epjb/s10051-025-00902-9","DOIUrl":"10.1140/epjb/s10051-025-00902-9","url":null,"abstract":"<p>In traffic networks, the intricate traffic congestion is the result of the abrupt deceleration and acceleration of non-motor vehicles that react by observing downstream situations. Furthermore, as information technology (IT) continues to grow and evolve, drivers can now obtain a precise assessment of the present status of real-time traffic on a prior basis. The traffic congestion that occurs due to traffic jerks may be minimized with the use of prior information (known as the predictive effect). To assess the impact of the predictive effect and traffic jerk effect on homogeneous vehicular flow, an extended lattice hydrodynamic model is proposed. Linear and nonlinear stability analysis is used to investigate the proposed model theoretically. The approach of reductive perturbation is used to derive the modified Korteweg–de Vries (mKdV) equation. Density waves in the structure of kink–antikink soliton waves around the critical point are formed. Further, numerical simulations are carried out to validate the theoretical predictions, confirming that incorporating the predictive effect into a traffic system may decrease traffic congestion more efficiently.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740674","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":"Investigation of the atomic structure and structural transformation in mullite glass under densification","authors":"Dung Tri Pham,&nbsp;Lan Thi Mai,&nbsp;Ha Thi Thanh Nguyen,&nbsp;Hong Van Nguyen","doi":"10.1140/epjb/s10051-025-00903-8","DOIUrl":"10.1140/epjb/s10051-025-00903-8","url":null,"abstract":"<div><p>This work reports the application of Classical Molecular Dynamics simulation to elucidate the atomic structure and process of structural transformation in mullite glass (g-3Al₂O₃·2SiO₂) at 600 K. Under densification, g-3Al₂O₃·2SiO₂ undergoes a structural transformation from a disordered state (low-density phase, with four-coordinated Si and Al at a density of 2.41 g/m³) to a more ordered state (high-density phase, with six-coordinated Si and six- and seven-coordinated Al at a density of 4.06 g/cm³). By structural visualization and analysis of various characteristics, such as the pair correlation functions, coordination number (CN), running CN of Si–O/Al–O, oxygen packing fraction (OPF), and ring statistics, we identified the structural phase transition point at 6 GPa, which corresponds to a mullite glass density of 3.80 g/cm³ and an OPF of 0.5595. The DBSCAN clustering algorithm is applied to identify the polyamorphism and density heterogeneity in g-3Al₂O₃·2SiO₂ under compression.</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 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749194","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":"Stability, photovoltaic, and optoelectronic properties of eco-friendly (CsGeCl_{3-n}F_n) halide perovskite for solar cells applications: insights from DFT calculations","authors":"J. Islah,&nbsp;E. Darkaoui,&nbsp;A. Abbassi,&nbsp;S. Taj,&nbsp;B. Manaut,&nbsp;H. Ez-Zahraouy","doi":"10.1140/epjb/s10051-025-00895-5","DOIUrl":"10.1140/epjb/s10051-025-00895-5","url":null,"abstract":"<p>This study explores the characteristics of fluorine-substituted lead-free halide perovskites <span>(CsGeCl_{3-n}F_n)</span> for clean energy applications, focusing on their structural, stability, and optoelectronic characteristics. Density functional theory (DFT) calculations, using Quantum Espresso code (QE), were performed to assess the material performance of the <span>(CsGeCl_{3-n}F_n)</span> series (<span>(n=0,1,2,3)</span>). The results reveal that fluorine substitution significantly enhances both thermodynamically and mechanical stability, which are confirmed by calculated formation energy and elastic constants. The Pugh’s and Poisson ratios are estimated to confirm reduced brittleness and increased ductility in <span>(CsGeCl_3)</span> upon the increase of fluorine content. The electronic analysis reveals a direct semiconducting nature with a tunable band gap, increasing from 1.03 eV to 2.06 eV upon fluorine substitution. Optical analysis indicates anisotropic behavior in mixed halides perovskites, <span>(CsGeCl_2F)</span> and <span>(CsGeClF_2)</span>, exhibiting strong absorption coefficients on the order of <span>(10^5)</span> cm<span>(^{-1})</span>, low reflectivity, and weak electron–hole interactions. These findings underscore the potential of <span>(CsGeCl_{3-n}F_n)</span> perovskites for improved performance in solar cells and other optoelectronic devices. The results offer valuable insights into optimizing these materials for advanced optoelectronic applications and sustainable energy technologies.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716885","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":"Unveiling the thermoelectric potential of perthioborate MBS₃(M = Rb;Cs) compounds: insights from DFT calculations","authors":"Garadi Fatima,&nbsp;Said Maabed,&nbsp;Hanifi Mebarki,&nbsp;Mohamed Halit,&nbsp;Cherif Mtta,&nbsp;Lamin Ben Kamri Ahmed","doi":"10.1140/epjb/s10051-025-00896-4","DOIUrl":"10.1140/epjb/s10051-025-00896-4","url":null,"abstract":"<div><p>This study presents a thorough theoretical investigation of perthioborate MBS₃ (M = Rb, Cs), a type of chalcogenometallate structure, using density functional theory to evaluate their suitability for thermoelectric applications. We examine the interconnections among their electronic, elastic, and thermoelectric properties. Electronic structure calculations reveal that these materials possess an indirect bandgap equal to 1.9 eV for M = Rb and 2.1 eV for M = Cs. Both RbBS₃ and CsBS₃ display low elastic constants, enhanced phonon anharmonicity and reduced thermal conductivity, which positions them as promising candidates for thermoelectric use. They also exhibit a substantial Seebeck coefficient and excellent electrical conductivity, especially along the zz direction, with values surpassing 400,000 Ω⁻¹m⁻¹ at 300 K. Within the temperature range of 400 K to 600 K, both materials demonstrate a high figure of merit close to 1. These theoretical insights highlight the promising potential of perthioborate materials for high-performance thermoelectric applications.</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 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676425","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":"Competition between long-range and short-range interactions in the voter model for opinion dynamics","authors":"Jacopo A. Garofalo,&nbsp;Eugenio Lippiello,&nbsp;Fabrizio Rippa","doi":"10.1140/epjb/s10051-025-00900-x","DOIUrl":"10.1140/epjb/s10051-025-00900-x","url":null,"abstract":"<div><p>The voter model is a widely used framework in sociophysics to model opinion formation based on local interactions between individuals. In this work, we investigate how the spread of consensus is affected by introducing long-range interactions. Specifically, we study a one-dimensional voter model where a fraction <span>(gamma )</span> of links connect individuals at distances <i>r</i> drawn from a distribution decaying as <span>(r^{-sigma -1})</span>. Our results reveal that even a small fraction of long-range interactions fundamentally alters the system’s asymptotic behavior. When long-range interactions decay rapidly <span>(sigma &gt; 2)</span>, their influence is restricted to distances beyond a time-dependent threshold, <span>(r^*(t))</span>. For <span>(r &lt; r^*(t))</span>, the system exhibits short-range dynamics characterized by a Gaussian-like correlation function and a diffusion-driven growth of the correlation length, <span>(L(t) sim t^{1/2})</span>. However, for <span>(r &gt; r^*(t))</span>, the correlation function transitions to a power-law decay, <span>(r^{-sigma -1})</span>, highlighting the capacity of long-range links to propagate consensus across greater distances. When long-range interactions decay more slowly (<span>(sigma &lt; 2)</span>), they dominate the dynamics at all scales, leading to behavior akin to a system with only long-range interactions. Notably, in the regime <span>(sigma &lt; 1)</span> long-range links induce a stationary steady state, even for small <span>(gamma )</span>.</p></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00900-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143668125","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":"Modulating the electronic and optical properties of InGeF3 perovskite under pressure: a computational approach","authors":"Mohammed Miri,&nbsp;Younes Ziat,&nbsp;Hamza Belkhanchi,&nbsp;Ayoub Koufi,&nbsp;Youssef Ait El Kadi","doi":"10.1140/epjb/s10051-025-00893-7","DOIUrl":"10.1140/epjb/s10051-025-00893-7","url":null,"abstract":"<div><p>This study explores the structural, mechanical, electronic and optical properties of InGeF₃ perovskite under varying pressures using density functional theory (DFT) via the Wien2k code. Elastic constants meet mechanical stability criteria at 0 GPa, with a notable improvement in ductility and hardness under pressure. Electronic analysis reveals an indirect band gap of 1.51 eV at 0 GPa, narrowing to 0.67 eV at 9 GPa, signaling a transition to metallic behavior. The density of states shows the dominance of halogens in the valence band, and significant contributions from indium and germanium in the conduction band. Optical properties, such as absorption and reflectivity, evolve under pressure, with a shift of the absorption spectrum toward lower energies. These findings demonstrate that pressure not only modifies the electronic structure of InGeF₃ but also enhances its optical performance, making it a potential candidate for photovoltaic applications.</p><h3>Graphical abstract</h3><p><b>a</b>) Absorption coefficient corresponding to the energy under pressure 0 GPa, 3 GPa, 6 GPa and 9 GPa for nGeF_<b>3</b>, <b>b)</b> Conductivity versus energy under pressure 0 GPa, 3 GPa, 6 GPa and 9 GPa GPa of InGeF₃</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 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645534","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":"Theoretical and experimental studies of melting of the 1/3 magnetization plateau in a frustrated (S=1/2) antiferromagnetic trimerized quantum Heisenberg spin chain compound (hbox {Na}_2hbox {Cu}_3hbox {Ge}_4hbox {O}_{12})","authors":"Sachin Kumar,&nbsp;A. K. Bera,&nbsp;Amit Kumar,&nbsp;Yurii Skourski,&nbsp;S. M. Yusuf","doi":"10.1140/epjb/s10051-025-00891-9","DOIUrl":"10.1140/epjb/s10051-025-00891-9","url":null,"abstract":"<p>We report the magnetization process of <span>(S=1/2)</span> Heisenberg antiferromagnetic <span>(J_1{-}J_1{-}J_2)</span> trimerized spin chain system (with frustration due to the next-nearest-neighbor interaction <span>(J_3)</span> within the trimer) under applied magnetic field by means of density-matrix renormalization group method. Here, <span>(J')</span>s are the antiferromagnetic exchange interaction constants. Specifically, we explore the phenomenon of 1/3 magnetization plateau for the exchange coupling ratios <span>( alpha = 0.18, beta =0.18 )</span>, and <span>(J_1=235)</span> K, where <span>(alpha =J_2/J_1)</span>, and <span>(beta =J_3/J_1)</span> as found for the model compound <span>(hbox {Na}_2hbox {Cu}_3hbox {Ge}_4hbox {O}_{12})</span>. It is found that a wide 1/3 quantum magnetization plateau state (observed in ground state magnetization) gradually disappears with increasing temperature beyond a crossover temperature <span>(T_{co})</span> due to thermal fluctuations. Based on numerical data, the width <i>w</i>(<i>T</i>) of the magnetization plateau is found to follow an exponential behave as <span>(sim e^{-B/sqrt{T_{co}-T}})</span>, where <i>B</i> is a constant and <span>(T_{co})</span> is estimated to be <span>( approx 60)</span> K. The occurrence of the 1/3 plateau is also seen through the field-induced energy gap in the energy-level spectrum of the system. The stability of the magnetization plateau state against the perturbation depends upon the size of the energy gap. Further, calculated isothermal magnetization results are compared with experimental high field magnetization data for the quasi-one-dimensional (1D) spin <span>(S=1/2)</span> trimer chain compound <span>(hbox {Na}_2hbox {Cu}_3hbox {Ge}_4hbox {O}_{12})</span>.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00891-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638153","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":"Chirality-induced rectification in asymmetric gear systems","authors":"Hui-zhang Xie,&nbsp;Jin-ran Li","doi":"10.1140/epjb/s10051-025-00894-6","DOIUrl":"10.1140/epjb/s10051-025-00894-6","url":null,"abstract":"<p>We investigate the emergence of unidirectional rotation in an asymmetric gear immersed in a chiral active particle bath under periodic boundary conditions. Our results demonstrate that the nonequilibrium characteristics of self-propelled particles can drive sustained rotational motion of the gear. The study reveals that both particle chirality and gear asymmetry independently induce symmetry breaking, which collectively leads to directed rotation. The rotational direction is determined by the interplay between these two factors, and we demonstrate that the direction can be reversed through systematic parameter control. Furthermore, we identify optimal parameter combinations of particle chirality and self-propulsion speed that maximize the gear’s rotational velocity. These findings provide fundamental insights into the control of active matter systems and offer practical guidelines for experimental designs that utilize chiral active matter to transform random motion into controlled directional movement.</p><p>The study investigates the emergence of directional rotation in an asymmetric gear immersed within a sea of chiral active particles under periodic boundary conditions. We demonstrate that the inherent nonequilibrium properties of these self-propelling particles can induce consistent gear rotation. </p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645533","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":"DFT study of the novel double perovskite Sr2PrRuO6: structural, electronic, optical, magnetic, and thermoelectric properties","authors":"Fatima Zohra Zoulikha Bellahcene,&nbsp;Kaddour Bencherif,&nbsp;Fafa Chiker,&nbsp;Djamel-Eddine Missoum,&nbsp;Djillali Bensaid","doi":"10.1140/epjb/s10051-025-00887-5","DOIUrl":"10.1140/epjb/s10051-025-00887-5","url":null,"abstract":"<div><p>This study presents a comprehensive analysis of the structural, electronic, magnetic, optical, and thermoelectric properties of the double perovskite Sr₂PrRuO₆ using density functional theory (DFT). Calculations were conducted using the full-potential linearized augmented plane wave (FP-LAPW) method, incorporating the Local Density Approximation (LDA), Generalized Gradient Approximation (GGA), and the Tran–Blaha modified Becke–Johnson (TB-mBJ) exchange–correlation potentials. The results demonstrate that Sr₂PrRuO₆ is structurally stable in its ferromagnetic (FM) configuration, with a magnetic moment of 3.00 µB, while the non-magnetic (NM) phase is energetically less favorable. Structural properties calculated using GGA provided more accurate lattice parameters compared to LDA. Electronic structure analysis reveals half-metallic behavior, confirmed by the TB-mBJ potential, underscoring its suitability for spintronic applications. Optical investigations, performed with the GGA + mBJ approach, reveal a notable optical band gap and diverse responses across the infrared, visible, and ultraviolet regions, consistent with the electronic structure. Thermoelectric properties, evaluated using Boltzmann transport equations (BTE) over a temperature range of 50–1000 K, highlight promising spin-polarized transport characteristics, making Sr₂PrRuO₆ a potential candidate for thermoelectric applications. In summary, this study highlights the unique combination of half-metallic ferromagnetism, strong optical properties, and excellent thermoelectric performance of Sr₂PrRuO₆, setting it apart from other double perovskites and positioning it as a promising candidate for advanced spintronic and thermoelectric applications.</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 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594780","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}