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

Dissipation-enhanced global photon blockade in a nonlinear dual-cavity system 非线性双腔系统中耗散增强的全局光子阻滞

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-03 DOI: 10.1140/epjp/s13360-026-07723-4

Jia-Mei Song, Shi-Yan Li, Ai-Dong Zhu, Lin Yu

引用次数: 0

Weyl–Cosserat elasticity and gravitational memory: an effective microstructured model of spacetime Weyl-Cosserat弹性和引力记忆：一个有效的时空微观结构模型

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-03 DOI: 10.1140/epjp/s13360-026-07691-9

David Izabel

引用次数: 0

Integrating higher-order Markov modeling with fuzzy automata for predictive genomics of hemoglobin subunit beta mutations 基于模糊自动机的高阶马尔可夫模型的血红蛋白亚基突变预测基因组学研究

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-02 DOI: 10.1140/epjp/s13360-026-07714-5

S. D. Jeniffer

{"title":"Integrating higher-order Markov modeling with fuzzy automata for predictive genomics of hemoglobin subunit beta mutations","authors":"S. D. Jeniffer","doi":"10.1140/epjp/s13360-026-07714-5","DOIUrl":"10.1140/epjp/s13360-026-07714-5","url":null,"abstract":"<div><p>Traditional studies on mutations in the hemoglobin beta gene have relied solely on the statistical analysis of single-gene mutations, which do not adequately capture their sequential and context-dependent dynamics. Current models are limited in scalability, perform significantly worse across populations, and have limited biological interpretability. Some hurdles of deep learning include overfitting and poor integration in the genomic context. A hybrid framework, centered on higher-order Markov chains with fuzzy logic, is proposed to represent uncertain mutation states and to capture probabilistic dependencies for modeling temporal mutations. Statistical, alignment, structural, and dynamic analyses of 100 mutated hemoglobin beta sequences are performed using Clustal Omega, entropy measures, a hidden Markov model, and co-occurrence networks. Higher-order probabilistic Markov modeling with fuzzy automata performs superiorly in all evaluations. In splice prediction, Area Under Curve (AUC) scores of 0.67 (3′) and 0.82 (5′) are achieved, which outperformed existing models. High alignment quality (similarity percentage 0.98, column score 0.029, total consistency 700) with low run time (0.42 s) is achieved using Clustal Omega. The proposed method achieved an accuracy of 98.7%, which outperformed standard tools. Moderate variability and conservation are demonstrated by entropy (0.42) and Hamming distance (11.2). Thus, proving that the proposed model offers a highly accurate, interpretable, and scalable solution for predictive genomics of gene mutations.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 5","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829688","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}

引用次数: 0

Magnetic and hysteresis properties of the Spin-7/2 Blume–Capel model in the presence of a random crystal field 随机晶体场存在下自旋7/2 blme - capel模型的磁滞特性

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-02 DOI: 10.1140/epjp/s13360-026-07735-0

M. Kake, S. B. Ogou, G. B. Aziza Goguin, E. Albayrak, R. A. A. Yessoufou, T. D. Oke, A. Kpadonou

{"title":"Magnetic and hysteresis properties of the Spin-7/2 Blume–Capel model in the presence of a random crystal field","authors":"M. Kake, S. B. Ogou, G. B. Aziza Goguin, E. Albayrak, R. A. A. Yessoufou, T. D. Oke, A. Kpadonou","doi":"10.1140/epjp/s13360-026-07735-0","DOIUrl":"10.1140/epjp/s13360-026-07735-0","url":null,"abstract":"<div><p>In this study, we rigorously investigate the spin-7/2 Ising Blume–Capel model subjected to randomly distributed single-ion anisotropy within a mean-field framework based on the Bogoliubov variational inequality. The ground-state phase diagram in the (<span>( alpha , d/q )</span>) plane reveals a rich hierarchy of magnetic phases, arising from the competition between the disorder strength <span>(alpha )</span> and the crystal field parameter d. At finite temperatures, the system exhibits a complex phase topology characterized by first-and second-order phase transitions, reentrant behavior, and isolated critical points. These features originate from the interplay between thermal fluctuations, anisotropy, and quenched disorder, and are significantly enhanced compared to lower-spin systems. The magnetic response displays multiple magnetization plateaus together with a pronounced multi-loop hysteresis structure, stemming from metastable states associated with the multilevel nature of the spin-7/2 system and strongly amplified by disorder effects. Overall, the results highlight the key role of high spin and quenched disorder in generating rich and nontrivial magnetic behavior.\u0000</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 5","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-026-07735-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829432","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}

引用次数: 0

Morphological, electro-conductive, and dielectric properties of PEO-5CB-NaIO4-SWCNT polymer/liquid-crystals electrolytes with single-walled carbon nanotube additives: exploration of nanofiller effect on the promising electrical and dielectric properties 添加单壁碳纳米管的PEO-5CB-NaIO4-SWCNT聚合物/液晶电解质的形态、导电性和介电性能：纳米填料对前景电性能和介电性能的影响

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-02 DOI: 10.1140/epjp/s13360-026-07722-5

Georgi B. Hadjichristov, Yordan G. Marinov, Todor E. Vlakhov

{"title":"Morphological, electro-conductive, and dielectric properties of PEO-5CB-NaIO4-SWCNT polymer/liquid-crystals electrolytes with single-walled carbon nanotube additives: exploration of nanofiller effect on the promising electrical and dielectric properties","authors":"Georgi B. Hadjichristov, Yordan G. Marinov, Todor E. Vlakhov","doi":"10.1140/epjp/s13360-026-07722-5","DOIUrl":"10.1140/epjp/s13360-026-07722-5","url":null,"abstract":"<div><p>We report an experimental characterization of the morphological, electro-conductive, and dielectric properties of relatively thin films (up to 70 μm in thickness) of ion-conducting polymer/liquid-crystals (LCs) nanocomposite electrolytes. The films were produced from the polymer poly(ethylene oxide) (PEO), the nematic LCs pentyl-cyanobiphenyl (5CB), the ion donor sodium metaperiodate (NaIO<sub>4</sub>), and single-walled carbon nanotubes (SWCNTs) as nanoparticle additives. The compositional ratio of PEO/5CB/NaIO<sub>4</sub> was 66.6/28.6/4.75 (w/w/w), while SWCNTs were incorporated at concentrations of 0.02; 0.12; and 0.24 wt.%. The morphology of the synthesized PEO-5CB-NaIO<sub>4</sub>-SWCNTs nanocomposite electrolyte films was correlated with their electrical conductivity and dielectric response, which were investigated by complex electrical impedance and dielectric spectroscopy over the frequency range from 0.1 Hz to 1 MHz. The incorporation of SWCNTs results in improved morphology, enhanced ionic conductivity, increased dielectric constant, stronger dipolar polarization, higher AC conductivity, and a reduction in the dielectric relaxation time. These effects in the studied nanostructured ion-conducting polymer/LCs material collectively lead to improved performance of this electrolytic system, with respect to its potential applications.</p><h3>Graphic abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 5","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829605","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}

引用次数: 0

Searching for long-lived particles with the ILD experiment 用ILD实验寻找长寿命粒子

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-02 DOI: 10.1140/epjp/s13360-026-07701-w

Jan Klamka, Aleksander Filip Żarnecki

引用次数: 0

Vanishing metric commutation relation and higher-derivative de Donder gauge in quadratic gravity 二次重力中的消失度量对易关系和高导数de Donder规范

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-02 DOI: 10.1140/epjp/s13360-026-07696-4

Ichiro Oda

引用次数: 0

Physics informed deep learning for steep-front dynamics in reaction–diffusion–convection processes 物理学为反应-扩散-对流过程中的陡锋动力学提供了深度学习

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-02 DOI: 10.1140/epjp/s13360-026-07689-3

Sana Ghafoor, Syed Tahir Raza Rizvi

{"title":"Physics informed deep learning for steep-front dynamics in reaction–diffusion–convection processes","authors":"Sana Ghafoor, Syed Tahir Raza Rizvi","doi":"10.1140/epjp/s13360-026-07689-3","DOIUrl":"10.1140/epjp/s13360-026-07689-3","url":null,"abstract":"<div><p>In this paper, a physics-informed deep learning approach is presented for solving the Fisher equation involving nonlinear convection over a prescribed spatiotemporal domain. Based on the classical Physics-Informed Neural Network (PINN), a Mix-Training PINN (MTPINN) approach is formulated, where the training set incorporates both initial and boundary data simultaneously for more robust imposition of physical constraints. To better handle convection-dominated problems characterized by strong traveling fronts, an improved MTPINN-PLUS approach is also formulated through automatic sampling of new training data in regions of high gradients. Numerical experiments, in the form of convergence curves, maps of the error distribution in physical space and detailed comparisons of wave fronts at enlarged scales, thus confirm the better stability and accuracy of the proposed MTPINN and MTPINN-PLUS approaches as compared to the classical PINN approach. Specifically, the new approaches give substantially smaller values of the relative <span>(L_2)</span> error and resolve more accurately the localized phenomena, especially in the vicinity of steep gradients. The proposed approach offers an efficient surrogate modeling tool for reaction–diffusion–convection processes with relevance to population dynamics, ecological invasion modeling and pattern formation, supporting sustainable development goals related to health, resilience and innovation. More concretely, the relative <span>(L_2)</span> error is decreased from the order of <span>(10^{-2})</span> to <span>(10^{-4})</span> for MTPINN, and further reduced to <span>(10^{-5})</span> for MTPINN-PLUS. Moreover, the mean absolute error (MAE) is also reduced. The convergence curves show the faster training behavior of the MTPINN and MTPINN-PLUS method, while the error distribution maps show the accuracy of the MTPINN-PLUS method for the steep traveling front solution, especially in the area of large gradients where the classical PINN method shows obvious deviation.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 5","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829430","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}

引用次数: 0

Convective instability analysis of bi-viscous Bingham fluid flow inside a horizontal porous channel under convective boundary conditions 水平多孔通道内双粘性Bingham流体在对流边界条件下的对流不稳定性分析

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-02 DOI: 10.1140/epjp/s13360-026-07742-1

Pankaj Barman, Dipak Barman, Ravi Ragoju, Dhananjay Yadav

{"title":"Convective instability analysis of bi-viscous Bingham fluid flow inside a horizontal porous channel under convective boundary conditions","authors":"Pankaj Barman, Dipak Barman, Ravi Ragoju, Dhananjay Yadav","doi":"10.1140/epjp/s13360-026-07742-1","DOIUrl":"10.1140/epjp/s13360-026-07742-1","url":null,"abstract":"<div><p>Convective boundary conditions act as a link between the fluid and its surroundings, altering wall temperatures and temperature gradients, which in turn directly influence the critical Rayleigh number and system stability. In this context, the novelty of the present study lies in investigating the convective instability of a bi-viscous Bingham fluid flowing through a horizontal porous channel with vertical throughflow, subject to convective thermal boundary conditions at both walls. After introducing appropriate non-dimensional scales, infinitesimal disturbances are superimposed on the basic steady-state flow, and linear stability analysis is performed to examine the resulting stability characteristics of the system. The corresponding eigenvalue problem associated with the neutral stability condition is numerically solved using the <i>bvp4c</i> solver in MATLAB. The results show that system stability increases monotonically as stronger external heating is applied at the bottom wall, irrespective of whether the external heating at the top wall increases or decreases. The system remains stable only when the heating at the bottom wall is dominated by stronger external heating at the top wall; otherwise, instability occurs. Furthermore, the study examines the onset of convection under two limiting boundary conditions: one boundary prescribed with a heat flux and the other maintained at an isothermal state. Finally, it is found that the onset of convection occurs earlier as the bi-viscous Bingham parameter increases for all considered boundary conditions.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 5","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829431","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}

引用次数: 0

The population inversion of a lambda three-level atom in a cavity 腔中λ三能级原子的居数反转

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-05-02 DOI: 10.1140/epjp/s13360-026-07705-6

Abebe Yeshaw, Misrak Getahun

引用次数: 0