The European Physical Journal B最新文献_第4页

Exploration of optical soliton propagation in birefringent optical fiber system in the absence of four-wave mixing 无四波混频双折射光纤系统中光孤子传播的探索

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-11 DOI: 10.1140/epjb/s10051-026-01216-0

Sonia Akram, Mati ur Rahman, Laila A. AL-Essa

{"title":"Exploration of optical soliton propagation in birefringent optical fiber system in the absence of four-wave mixing","authors":"Sonia Akram, Mati ur Rahman, Laila A. AL-Essa","doi":"10.1140/epjb/s10051-026-01216-0","DOIUrl":"10.1140/epjb/s10051-026-01216-0","url":null,"abstract":"<div><p>The dynamics of optical pulse propagation in birefringent fibers can be described by the Biswas–Arshed equation, which admits a two-component formulation for simulating vector solitons in optical fiber communication systems. This model incorporates higher-order dispersion, Kerr-type nonlinearity, spatio-temporal effects, and self-steepening, making it well suited for observing ultrashort pulse evolution and polarization dynamics in anisotropic media. A detailed exploration of its solution structure is, therefore, of significant importance for comprehending nonlinear wave propagation in modern photonic systems. In this study, the Biswas–Arshed equation is analytically studied in the absence of four-wave mixing. By utilizing the Jacobi elliptic function expansion approach in conjunction with the <span>(left( frac{{mathcal {F}}}{mu {mathcal {F}}+{mathcal {G}}}right) )</span>–expansion technique, a rich class of exact vector soliton solutions is obtained. The derived solutions include dark and bright solitons, combined and singular waveforms, as well as periodic, trigonometric, elliptic, hyperbolic, and mixed-mode structures. Furthermore, the Jacobi elliptic solutions naturally degenerate into hyperbolic and trigonometric forms under suitable parameter limits, offering a unified analytical framework for diverse nonlinear excitations. The physical characteristics of the retrieved solutions are demonstrated through graphical analysis, revealing their propagation structure and sensitivity to system parameters. The obtained results demonstrate that the adopted analytical methods generate a diverse collection of exact solution families for the Biswas–Arshed model and provide valuable insight into nonlinear pulse dynamics in birefringent optical fibers. These findings may be useful for further analytical analysis of nonlinear pulse dynamics in birefringent optical fibers.</p></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 9","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927398","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}

引用次数: 0

Near-resonance-induced caustics and scaling laws in a quantum kicked rotor 量子踢转子中的近共振诱导焦散和标度定律

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-11 DOI: 10.1140/epjb/s10051-026-01239-7

Yi Cao, Shaowen Lan, Bin Sun, Jie Liu

引用次数: 0

Information flow and plasticity: modeling visual cortex recovery after stroke 信息流和可塑性：脑卒中后视觉皮层恢复模型

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-10 DOI: 10.1140/epjb/s10051-026-01246-8

Natalí Guisande, Román Baravalle, Fernando Montani

{"title":"Information flow and plasticity: modeling visual cortex recovery after stroke","authors":"Natalí Guisande, Román Baravalle, Fernando Montani","doi":"10.1140/epjb/s10051-026-01246-8","DOIUrl":"10.1140/epjb/s10051-026-01246-8","url":null,"abstract":"<p>Focal lesions in the visual cortex, commonly caused by stroke and resulting in scotomas, present a major challenge for visual rehabilitation. In this study, a computational model is introduced to investigate how receptive field expansion may support functional recovery after such damage. Receptive fields were modeled using difference-of-Gaussians functions, and their outputs were used to drive a simulated cortical population of Izhikevich neurons. The lesion was represented as a region of inactivity, and plasticity was implemented by allowing perilesional receptive fields to extend into the affected area. To assess recovery, causal information measures were applied across classical frequency bands, enabling the quantification of directed information flow and emergent dynamics within the simulated population. The results show that receptive field expansion increases neuronal activity in perilesional regions, with functional reorganization emerging most prominently in the <span>(beta )</span> and <span>(gamma )</span> bands. In these bands, causal information analysis revealed consistent increases in information content, complexity, and entropy. Notably, the presence of maxima in these metrics suggests an inherent limit to the compensatory capacity of this plasticity mechanism alone.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 9","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927462","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}

引用次数: 0

Study on manipulations of the transformed waves in the (2+1)-dimensional generalized Hirota–Satsuma–Ito equation with variable coefficients （2+1）维变系数广义Hirota-Satsuma-Ito方程中变换波的处理研究

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-10 DOI: 10.1140/epjb/s10051-026-01252-w

Tianhao Ji, Xuemin Yao

引用次数: 0

Distinct roles of fear and density-dependent carrying capacity in predator–prey dynamics: a continuous and discrete-time analysis 恐惧和密度依赖性承载能力在捕食者-猎物动力学中的独特作用：连续和离散时间分析

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-09 DOI: 10.1140/epjb/s10051-026-01241-z

Orhan Ozgur Aybar, Ilknur Kusbeyzi Aybar

{"title":"Distinct roles of fear and density-dependent carrying capacity in predator–prey dynamics: a continuous and discrete-time analysis","authors":"Orhan Ozgur Aybar, Ilknur Kusbeyzi Aybar","doi":"10.1140/epjb/s10051-026-01241-z","DOIUrl":"10.1140/epjb/s10051-026-01241-z","url":null,"abstract":"<p>We study a predator–prey system in which prey growth is simultaneously modulated by two mechanisms: a fear effect that reflects the cost of perceived predation risk, and a prey-density-dependent carrying capacity that couples the environment directly to prey abundance. Related studies have combined fear with other forms of carrying-capacity modulation; here the distinctive feature is the instantaneous prey-driven law <span>(K(x)=k+beta x)</span> together with a parallel continuous- and discrete-time analysis. For the continuous system we establish positivity and boundedness, obtain the equilibria in closed form, identify a transverse Hopf crossing, and prove a transcritical bifurcation. For the baseline parameter set the first Lyapunov coefficient is negative at every point of a 401-point scan over <span>(fin [0,20])</span>, supporting a supercritical Hopf bifurcation throughout the tested grid. A central finding is that the two mechanisms act on different facets of the dynamics: the density-dependent carrying capacity is destabilizing and amplifies population oscillations, whereas fear leaves the continuous Hopf threshold exactly unchanged and monotonically suppresses the equilibrium predator density. In the discrete map fear additionally lowers the Neimark–Sacker onset, so its stability effect differs from that in the continuous formulation. No robust positive Lyapunov exponent is detected in the sampled coexistence scans; the observed dynamics are organized by quasi-periodic motion, mode-locked Arnold tongues, and multistability with finely interdigitated basin boundaries. Together these results clarify how habitat modification and predation risk shape the qualitative dynamics of interacting populations.</p><p>Density dependence in <span>(K(x)=k+beta x)</span> promotes oscillations; fear suppresses predator abundance and acts distinctly in discrete time</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 9","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927002","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}

引用次数: 0

Wronskian solutions and linear superposition of the (2+1)-dimensional Hirota–Satsuma–Ito equation （2+1）维Hirota-Satsuma-Ito方程的朗斯基解和线性叠加

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-08 DOI: 10.1140/epjb/s10051-026-01244-w

Mengli Li, Wang Tan, Yunhu Wang, Hui Wang

引用次数: 0

Exact analytical treatment of thermodynamic signatures in non-spherical quantum dots: a Tsallis non-extensive perspective 非球形量子点中热力学特征的精确解析处理：一个Tsallis非扩展的视角

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-07 DOI: 10.1140/epjb/s10051-026-01248-6

H. R. Rastegar Sedehi

{"title":"Exact analytical treatment of thermodynamic signatures in non-spherical quantum dots: a Tsallis non-extensive perspective","authors":"H. R. Rastegar Sedehi","doi":"10.1140/epjb/s10051-026-01248-6","DOIUrl":"10.1140/epjb/s10051-026-01248-6","url":null,"abstract":"<div><p>In this work, we have systematically investigated the thermodynamic properties of quantum dots confined by the non-spherical oscillator potential within the Tsallis non-extensive statistical framework. The Schrödinger equation was solved exactly using the Laplace transform method, yielding closed-form energy eigenvalues that explicitly depend on the quantum numbers, the association energy, the equilibrium distance, and the effective mass. From these eigenvalues, we constructed the generalized partition function and derived the entropy and specific heat as functions of temperature, confinement parameters, and the entropic index. Our results reveal that the specific heat exhibits Schottky anomalies whose position and magnitude are highly sensitive to both the quantum dot size and the confining potential strength. The entropy increases monotonically with temperature and dot size, while the entropic index profoundly modulates the thermodynamic response, particularly in the high-temperature regime where differences in entropy become strongly q-dependent. The systematic parametric analysis demonstrates that precise control over the system's thermal behavior can be achieved by tuning the confinement geometry and the non-extensive parameter. The observed crossover in entropy curves and the systematic shifts in specific heat peaks provide valuable insights into the underlying energy-level structure. These findings contribute to the broader understanding of non-extensive thermodynamics in nanoscale systems and hold promise for applications in thermal management, quantum device engineering, and nano-calorimetry, where accurate control of thermodynamic properties is essential.</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":"99 9","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927217","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}

引用次数: 0

Screening of Coulomb interactions in (textrm{MoS}_{2}) nanoribbons: enhanced correlations, antiscreening, and edge magnetism 库仑相互作用的筛选(textrm{MoS}_{2})纳米带：增强的相关性，反筛选，和边缘磁性

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-07 DOI: 10.1140/epjb/s10051-026-01240-0

A. Montaghemi, H. Hadipour, A. Khademi, A. Yazdani

{"title":"Screening of Coulomb interactions in (textrm{MoS}_{2}) nanoribbons: enhanced correlations, antiscreening, and edge magnetism","authors":"A. Montaghemi, H. Hadipour, A. Khademi, A. Yazdani","doi":"10.1140/epjb/s10051-026-01240-0","DOIUrl":"10.1140/epjb/s10051-026-01240-0","url":null,"abstract":"<p><span>(textrm{MoS}_{2})</span> has attracted significant attention for its promising applications in optoelectronics, owing to the remarkable stability of its excitons and trions. These quasiparticles have large binding energies that arise from the <span>(textrm{MoS}_{2})</span>’s moderate bandgap and the unconventional screening of Coulomb interactions in low dimensions. Here, we investigate the screening of long-range Coulomb interactions in the <span>(1textrm{H})</span> and <span>(1textrm{T}^{prime })</span> phases of <span>(textrm{MoS}_{2})</span> across different dimensionalities, with particular emphasis on nanoribbons. Our analysis is based on first-principles calculations combined with the constrained random-phase approximation. This work presents a comparative study of <span>(textrm{MoS}_{2})</span>, <i>h</i>-<span>(textrm{BN})</span>, black phosphorene, and graphene nanoribbons, with emphasis on the role of Coulomb interactions in shaping their electronic and magnetic properties. In one-dimensional nanoribbons, quantum confinement leads to a substantial enhancement of Coulomb interactions relative to 2D <span>(textrm{MoS}_{2})</span>. Calculations show that the Hubbard <i>U</i> increases from <span>(2.6,text {eV})</span> in the 2D system to nearly <span>(3.5,text {eV})</span> in the semiconducting nanoribbons. In these systems, the Coulomb interaction is long-ranged, with its tail extending over more than 100 Å, nearly twice of that in the 2D structure. The presence of asymmetric edge states involving <i>d</i> and <i>p</i> orbitals in non-hydrogen-passivated zigzag <span>(textrm{MoS}_{2})</span> nanoribbons, in contrast to phosphorene, <i>h</i>-<span>(textrm{BN})</span>, and graphene nanoribbons, results in a finite net magnetization.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 9","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148927218","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}

引用次数: 0

The power of Network Pluralism: multi-perspective modeling of heterogeneous legal document networks 网络多元化的力量：异构法律文件网络的多视角建模。

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-02 DOI: 10.1140/epjb/s10051-026-01178-3

Titus Pünder, Corinna Coupette

{"title":"The power of Network Pluralism: multi-perspective modeling of heterogeneous legal document networks","authors":"Titus Pünder, Corinna Coupette","doi":"10.1140/epjb/s10051-026-01178-3","DOIUrl":"10.1140/epjb/s10051-026-01178-3","url":null,"abstract":"<div><p>Insights are relative—influenced by a range of factors such as assumptions, scopes, or methods that together define a <i>research perspective</i>. In normative and empirical fields alike, this insight has led to the conclusion that no single perspective can generate complete knowledge. As a response, <i>epistemological pluralism</i> mandates that researchers consider multiple perspectives simultaneously to obtain a holistic understanding of their phenomenon under study. Translating this mandate to network science, our work introduces <i>Network Pluralism</i> as a conceptual framework that leverages <i>multi-perspectivity</i> to yield more complete, meaningful, and robust results. We develop and demonstrate the benefits of this approach via a hands-on analysis of <i>complex legal systems</i>, constructing a <i>network space</i> from references across documents from different branches of government as well as including organizational hierarchy above and fine-grained structure below the document level. Leveraging the resulting heterogeneity in a <i>multi-network analysis</i>, we show how <i>complementing</i> perspectives can help contextualize otherwise high-level findings, how <i>contrasting</i> several networks derived from the same data enables researchers to <i>learn by difference</i>, and how relating metrics to perspectives may increase the transparency and robustness of network-analytical results. To analyze a space of <i>networks as perspectives</i>, researchers need to map <i>dimensions of variation</i> in a given domain to network-modeling decisions and network-metric parameters. While this remains a challenging and inherently interdisciplinary task, our work acts as a blueprint to facilitate the broader adoption of Network Pluralism in domain-driven network research.</p></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"99 9","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13538272/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148885810","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}

引用次数: 0

A discrete memristive hyperchaotic map with multiple transient behaviors: design, analysis, and application to DNA image encryption 具有多重瞬态行为的离散记忆超混沌映射：设计、分析和应用于DNA图像加密

IF 1.9 4区物理与天体物理

The European Physical Journal B Pub Date : 2026-09-01 DOI: 10.1140/epjb/s10051-026-01236-w

Qiao Wang, Wei Liao, Aihua Shi, Xianming Wu, Haiwei Sang, Gewa Wan

{"title":"A discrete memristive hyperchaotic map with multiple transient behaviors: design, analysis, and application to DNA image encryption","authors":"Qiao Wang, Wei Liao, Aihua Shi, Xianming Wu, Haiwei Sang, Gewa Wan","doi":"10.1140/epjb/s10051-026-01236-w","DOIUrl":"10.1140/epjb/s10051-026-01236-w","url":null,"abstract":"<div><p>Discrete memristive chaotic maps are widely studied for information security applications, but existing low-dimensional designs are generally constrained by limited parameter space and low non-linear complexity, which cannot meet the stringent requirements of modern high-security encryption. This article introduces a fresh high-complexity two-dimensional discrete memristive hyperchaotic map (2D-DMHM), where an absolute-value charge-regulated discrete memristor is integrated with the simplified Logistic and Sine maps to enhance system dynamics. The dynamical characteristics of the suggested map are methodically analyzed, and its physical feasibility is verified through DSP-based hardware realization. A block-based DNA image encryption protocol is additionally formulated based on the suggested map, and security assessments confirm that the proposed scheme attains desirable performance. Findings show that the proposed design possesses promising application potential in realistic image security defense.</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":"99 9","pages":""},"PeriodicalIF":1.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859905","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}

引用次数: 0