The European Physical Journal E最新文献

25th EPJE anniversary: vision piece on EPJE role today and tomorrow EPJE成立25周年：展望EPJE今天和明天的作用

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-10-15 DOI: 10.1140/epje/s10189-026-00630-7

Fabrizio Croccolo, Giovanna Fragneto, Holger Stark

引用次数: 0

Weakly nonlinear creep of amorphous polymers near their glass transition: comparisons between models and experiment 非晶聚合物在玻璃化转变附近的弱非线性蠕变：模型与实验的比较。

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-10-12 DOI: 10.1140/epje/s10189-026-00646-z

Martin Roman-Faure, Zhaocheng Zhang, Catalin Picu, Antoine Chateauminois, François Lequeux

{"title":"Weakly nonlinear creep of amorphous polymers near their glass transition: comparisons between models and experiment","authors":"Martin Roman-Faure, Zhaocheng Zhang, Catalin Picu, Antoine Chateauminois, François Lequeux","doi":"10.1140/epje/s10189-026-00646-z","DOIUrl":"10.1140/epje/s10189-026-00646-z","url":null,"abstract":"<p>The non-linear mechanics of amorphous polymers near the glass transition reveals a stress-induced acceleration of stress relaxation of nano-metric sub-units. Recent theoretical work predicts that the local acceleration within these nano-domains should scale as the exponential of the squared local stress, a behavior now supported by experiments. However, this local dynamics has some complex consequences on the macroscopic mechanical response, as dynamical heterogeneities generate complex stress and strain fields in polymers close to the glass transition. In this study we consider the nonlinear creep of an amorphous polymer near its glass transition and evaluate the relation between local and global acceleration and the emerging load-carrying structure, by comparing experimental data with predictions of three models of increasing complexity: a two-state (2S) model, a self-consistent (SC) model and a finite element (FEM) model. The experimentally observed trend of accelerated creep under increasing applied stress is reproduced by the SC and FEM models, while the 2S model overestimates stress localization. The macroscopic, homogenized acceleration is predicted to be close to the microscopic one, albeit with an apparent yield stress that depends on compliance. The FEM model evidences the development of a load-carrying substructure that occupies a small fraction of the total material volume driven by the interaction of sub-domains. This work shows that complexity and heterogeneity emerge due to nonlinear interactions and that their adequate representation is essential for predicting the macroscopic mechanical response of amorphous polymers near their glass transition.</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"49 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149164001","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

Simulation of subharmonic frequency lock-in and phase synchronization using Van der Pol equation 用范德波尔方程模拟次谐波频率锁相和相位同步。

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-10-12 DOI: 10.1140/epje/s10189-026-00645-0

Nizar Abcha, Reine Matar, Iskander Abroug

{"title":"Simulation of subharmonic frequency lock-in and phase synchronization using Van der Pol equation","authors":"Nizar Abcha, Reine Matar, Iskander Abroug","doi":"10.1140/epje/s10189-026-00645-0","DOIUrl":"10.1140/epje/s10189-026-00645-0","url":null,"abstract":"<div><p>This study examines subharmonic frequency lock-in and phase synchronization of vortex shedding behind a partially immersed circular cylinder placed in a steady water current and subjected to harmonic surface waves. A forced Van der Pol wake-oscillator model was developed to describe the nonlinear coupling between the wake dynamics and external periodic forcing, with parameters validated against wave-flume experiments. Both numerical and experimental results reveal that synchronization occurs when the forcing frequency is approximately twice the natural shedding frequency, forming Arnold-tongue-shaped regions in the amplitude–frequency plane. At the edges of these regions, chaotic and intermittent behaviors emerge, highlighting the nonlinear nature of the wake–forcing interaction. The strong agreement between model predictions and laboratory observations confirms the relevance of the Van der Pol framework for predicting vortex-induced vibration in oscillatory environments and provides insight into the transition between unsynchronized and fully phase-locked regimes. In addition, a machine learning framework based on a multilayer perceptron (MLP) was implemented to classify synchronization states directly from the frequency–forcing parameter space. The MLP successfully reproduced the experimentally observed synchronization boundaries and achieved prediction accuracies exceeding 93% for experimental data and 98% for theoretical data, demonstrating its capability to identify complex nonlinear lock-in dynamics. These results highlight the potential of combining physics-based reduced-order models with data-driven approaches for improved prediction and analysis of flow synchronization phenomena.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><img></picture></div></div></figure></div></div>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"49 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149164019","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

Long-time behavior of velocity correlation of a Brownian particle in a near-critical binary fluid mixture 近临界二元流体混合物中布朗粒子速度相关的长时间行为

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-10-08 DOI: 10.1140/epje/s10189-026-00642-3

Youhei Fujitani

{"title":"Long-time behavior of velocity correlation of a Brownian particle in a near-critical binary fluid mixture","authors":"Youhei Fujitani","doi":"10.1140/epje/s10189-026-00642-3","DOIUrl":"10.1140/epje/s10189-026-00642-3","url":null,"abstract":"<p>We consider a rigid spherical particle suspended in a binary fluid mixture in the one-phase region near the demixing critical point, assuming the critical composition far from the particle. The particle surface is assumed to interact with mixture components via short-range forces, which can generate the adsorption layer rich in the preferred component and can influence the force exerted on the particle. Applying hydrodynamics based on a coarse-grained free-energy density, we calculate the linear response of the particle velocity to an oscillating external force. We devise a procedure for calculating the first four terms in the low-frequency expansion of the dissipative part of the hydrodynamic force exerted on the particle. We numerically show that the preferential adsorption (PA) changes the coefficients of the four terms, which determine the leading and the next-to-leading terms in the long-time expansion of the particle’s velocity correlation function at equilibrium. The temporal exponents of these terms are not changed by PA. According to our numerical results, the back-flow effects on the first two terms in the low-frequency expansion cancel each other out and PA does not affect the coefficient of the leading term, which is consistent with the previous results obtained in the framework of the Gaussian model. The coefficient of the next-to-leading term can be changed by PA. This change is in the direction of suppressing the correlation for a neutrally buoyant particle.</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"49 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132615","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

Research and innovation in soft matter: from de Gennes’ legacy to future horizons 软物质的研究与创新：从德热纳的遗产到未来的视野。

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-10-05 DOI: 10.1140/epje/s10189-026-00639-y

Elise Lorenceau, Laurence Ramos, Thomas Salez

{"title":"Research and innovation in soft matter: from de Gennes’ legacy to future horizons","authors":"Elise Lorenceau, Laurence Ramos, Thomas Salez","doi":"10.1140/epje/s10189-026-00639-y","DOIUrl":"10.1140/epje/s10189-026-00639-y","url":null,"abstract":"<div><p>Soft matter science—the science of complex condensed systems, characterized by abundant interfaces and the capacity for strong responses to modest perturbations, encompassing polymers, colloids, gels, surfactants, liquid crystals, and even less obvious subfields such as micro- and nanofluidics, where the role of interfaces becomes even more dominant due to extreme confinement—has long been a driving force behind industrial innovation. This can be explained, on the one hand, by the unique properties of flexibility, responsiveness, and adaptability of soft materials, and on the other hand, by its impact on the shaping and processing of materials, and on their properties during use. This article explores the historical and contemporary links between industry and soft matter, up to modern innovations in various fields. It examines the outcomes of academic-industrial collaborations, the transformative potential of artificial intelligence, and the emerging role of high-throughput experiments in reshaping research paradigms. By drawing parallels with global advancements, this article underscores the critical role of fundamental research in addressing future challenges, from sustainable energy to adaptive materials.\u0000</p></div>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"49 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149102505","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

Speed heterogeneity and non-Gaussian transport in active particles: a survival-hazard framework 活性粒子中的速度非均匀性和非高斯输运：生存-危险框架。

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-09-28 DOI: 10.1140/epje/s10189-026-00638-z

Mashael A. Aljohani, Mohamed Abd Allah El Hadidy

{"title":"Speed heterogeneity and non-Gaussian transport in active particles: a survival-hazard framework","authors":"Mashael A. Aljohani, Mohamed Abd Allah El Hadidy","doi":"10.1140/epje/s10189-026-00638-z","DOIUrl":"10.1140/epje/s10189-026-00638-z","url":null,"abstract":"<div><p>Non-Gaussian displacement statistics in active-particle systems are often associated with heterogeneity in particle motility. In this work, we develop an estimation-based statistical framework that links speed distributions inferred from experimental data to effective-diffusivity and displacement statistics in active Brownian particles (ABPs) and active particles with passive noise (APPs). Rayleigh, Weibull, and generalized gamma distributions are fitted by maximum likelihood to a sample of 53 representative speeds extracted from experimental cell trajectories, and the candidate models are compared using the Akaike information criterion (AIC), the Bayesian information criterion (BIC), and the Kolmogorov–Smirnov statistic. The fitted distributions are further examined through their cumulative distribution, survival, hazard, and reversed-hazard functions, allowing the distinct contributions of slow and fast particles to the transport statistics to be characterized. The results show that the Weibull distribution provides the most efficient balance between goodness of fit and model complexity according to AIC and BIC, whereas the generalized gamma distribution yields a slightly smaller empirical discrepancy at the cost of an additional parameter. Propagating the fitted speed distributions through the quadratic diffusivity map of the ABP model and the quartic map of the APP model demonstrates that the amplification of speed heterogeneity depends strongly on the underlying dynamical mechanism and directly shapes the resulting non-Gaussian displacement profiles. The proposed framework therefore provides a statistically validated and physically interpretable link between experimentally observed motility variability and macroscopic transport behavior.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"49 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149068891","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

Droplets sitting on thin elastic sheets: a study with the boundary element method 位于弹性薄片上的液滴：边界元法的研究。

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-09-28 DOI: 10.1140/epje/s10189-026-00620-9

Salik Sultan, Josua Grawitter, Gonçalo C. Antunes, Holger Stark

{"title":"Droplets sitting on thin elastic sheets: a study with the boundary element method","authors":"Salik Sultan, Josua Grawitter, Gonçalo C. Antunes, Holger Stark","doi":"10.1140/epje/s10189-026-00620-9","DOIUrl":"10.1140/epje/s10189-026-00620-9","url":null,"abstract":"<p>Elasto-capillarity of a droplet wetting an elastic sheet provides an interesting system, both for fundamental and applied research. The droplet sinks into the sheet and assumes the shape of a lens. To determine the equilibrium shape in simulations, we formulate a boundary element method (BEM) extending our earlier approaches, and apply the BEM to three specific protocols for the boundary conditions of the sheet. For a clamped elastic sheet, we use various morphological metrics to demonstrate that the lens shape crucially depends on the sheet thickness. Stretching the sheet isotropically allows for an additional control parameter to influence the droplet shape and the tension in the sheet, which we quantify by radial profiles of the azimuthal and radial elastic stresses. We further demonstrate how the focal length of a liquid lens can be tuned by varying the applied tension. Finally, stretching the sheet along one direction elongates the droplet, and the sheet shows folds and dimples.</p><p>A droplet wetting a clamped elastic sheet assumes a lens shape (bottom); stretching the sheet along one direction, the droplet also elongates and the sheet shows folds and dimples (top) </p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"49 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13619792/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149073105","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

Ion flow under an applied electric field in semiconducting and metallic carbon nanotubes 外加电场作用下半导体和金属碳纳米管中的离子流动。

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-09-27 DOI: 10.1140/epje/s10189-026-00636-1

J. B. Sokoloff

引用次数: 0

Application of machine learning for the identification of 2D colloidal assemblies: a case study on particles of distinct shapes 机器学习在二维胶体组件识别中的应用：不同形状颗粒的案例研究

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-09-26 DOI: 10.1140/epje/s10189-026-00640-5

Ludia T. Khusainova, Svetlana A. Kolegova, Konstantin S. Kolegov

{"title":"Application of machine learning for the identification of 2D colloidal assemblies: a case study on particles of distinct shapes","authors":"Ludia T. Khusainova, Svetlana A. Kolegova, Konstantin S. Kolegov","doi":"10.1140/epje/s10189-026-00640-5","DOIUrl":"10.1140/epje/s10189-026-00640-5","url":null,"abstract":"<p>This work addresses the problem of identifying colloidal monolayer assemblies using particles of various shapes (two-dimensional coatings): spheres, ellipsoids, cuboids, and rods. The following classification of assemblies is considered: isolated particles, dimers, chains, clusters, and loops. The YOLO model was chosen as the identification method. Synthetic datasets were prepared for each of the four particle shapes to train the models. The paper discusses the application of models trained on synthetic data to experimental images. An analysis was carried out on the feasibility of using such models for recognizing configurations in real images. While recognition on artificial images is nearly perfect, tests on experimental images showed a significant deviation. The average error across all particle types was 43.1%, but a considerable spread in values is observed: from 20% for spheres to 58.5% for cuboids, indicating the algorithm’s selective sensitivity to object geometry. The created datasets and trained models are freely available for use. The corresponding modules have been integrated into the previously developed information system (https://isanm.space/). To further improve prediction results, it is necessary to prepare datasets based on experimental images.</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"49 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149035061","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

A Brownian dynamics study of liquid–liquid phase separation in multiscale chromatin networks 多尺度染色质网络中液-液分离的布朗动力学研究

IF 2.6 4区物理与天体物理

The European Physical Journal E Pub Date : 2026-09-25 DOI: 10.1140/epje/s10189-026-00634-3

Léa Beaulès, Judith Miné-Hattab, Pierre Illien, Vincent Dahirel

{"title":"A Brownian dynamics study of liquid–liquid phase separation in multiscale chromatin networks","authors":"Léa Beaulès, Judith Miné-Hattab, Pierre Illien, Vincent Dahirel","doi":"10.1140/epje/s10189-026-00634-3","DOIUrl":"10.1140/epje/s10189-026-00634-3","url":null,"abstract":"<p>In living cells, proteins involved in specialized biochemical functions are often spatially organized within biomolecular condensates. Increasing evidence suggests that some of these condensates, including DNA repair condensates, emerge through liquid–liquid phase separation (LLPS). In the nucleus, however, condensates form within a highly heterogeneous environment composed of chromatin fibers, RNA, and additional protein scaffolds such as PAR chains, all of which may interact with phase-separating proteins. Moreover, condensate formation is frequently associated with specific chromatin conformations; for instance, loop extrusion has been proposed as a mechanism promoting DNA repair condensates. Here, we investigate how the surrounding fibrous environment controls the morphology and spatial organization of phase-separated condensates. Using Brownian dynamics simulations of minimal models combining Lennard–Jones particles with fixed fibrous substrates, we examine the respective roles of local fiber geometry and large-scale network organization, reflecting the multiscale architecture of chromatin. We show that protein–fiber interactions strongly influence droplet positioning relative to the substrate, in a manner analogous to wetting transitions in soft condensed matter systems. Both local geometric constraints and global network organization markedly affect droplet size, morphology, and multiplicity. In addition, large-scale asymmetries in fiber organization can induce robust spatial localization of the dense phase. Our results thus highlight how multiscale structural heterogeneity of the nuclear environment can regulate the emergence and organization of biomolecular condensates.</p>","PeriodicalId":790,"journal":{"name":"The European Physical Journal E","volume":"49 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149035234","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