The European Physical Journal B最新文献_第5页

How does pressure influence heat conduction for 1D nonlinear lattices with symmetric and asymmetric interactive potentials? 压力如何影响具有对称和不对称相互作用势的一维非线性晶格的热传导？

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-17 DOI: 10.1140/epjb/s10051-025-00921-6

Hongbin Chen, Nianbei Li

引用次数: 0

New positive mixed alkali effect in V2O5.nH2O nanocrystalline films V2O5中新的正混合碱效应。nH2O纳米晶膜

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-17 DOI: 10.1140/epjb/s10051-025-00907-4

A. S. Abdel Moghny, Samia E. Attia Negm, Sh. Heikal, A. A. Bahgat

{"title":"New positive mixed alkali effect in V2O5.nH2O nanocrystalline films","authors":"A. S. Abdel Moghny, Samia E. Attia Negm, Sh. Heikal, A. A. Bahgat","doi":"10.1140/epjb/s10051-025-00907-4","DOIUrl":"10.1140/epjb/s10051-025-00907-4","url":null,"abstract":"<p>V<sub>2</sub>O<sub>5</sub>·nH<sub>2</sub>O nanocrystalline films intercalated with Li<sup>+</sup> and Na<sup>+</sup> ions were prepared using the sol–gel technique. The compositions of Li<sub>x</sub>Na<sub>1-x</sub>V<sub>2</sub>O<sub>5</sub>·nH<sub>2</sub>O were varied with 0 ≤ x ≤ 1 mol% to investigate the mixed alkali effect on structural properties, such as density and X-ray diffraction (XRD), as well as DC electrical conductivity and thermoelectric power. XRD analysis revealed that the Li<sub>x</sub>Na<sub>1-x</sub>V<sub>2</sub>O<sub>5</sub>·nH<sub>2</sub>O films consist of highly oriented nanocrystals. Structural analysis showed that the intercalation of alkali ions did not significantly alter the structure, while the crystallite size and interlayer spacing exhibited a nonlinear dependence on Li content. Density calculations revealed a linear dependence on composition. The variation of DC conductivity showed a maximum conductivity (σ<sub>dc</sub>) and minimum activation energy (W<sub>dc</sub>) at x = 0.5 mol%, which can be attributed to the mixed alkali effect resulting from the mixing of two alkali oxides. The thermoelectric power (S) and power factor (PF) exhibited nonlinear behavior due to the mixed alkali effect.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840397","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

Allee-induced periodicity and bifurcations in a Gause-type model with interference phenomena 具有干涉现象的高斯模型中由同类引起的周期性和分岔现象

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-16 DOI: 10.1140/epjb/s10051-025-00911-8

Gourav Mandal, Alejandro Rojas-Palma, Eduardo González-Olivares, Santabrata Chakravarty, Lakshmi Narayan Guin

{"title":"Allee-induced periodicity and bifurcations in a Gause-type model with interference phenomena","authors":"Gourav Mandal, Alejandro Rojas-Palma, Eduardo González-Olivares, Santabrata Chakravarty, Lakshmi Narayan Guin","doi":"10.1140/epjb/s10051-025-00911-8","DOIUrl":"10.1140/epjb/s10051-025-00911-8","url":null,"abstract":"<p>Predator–prey models currently serve as essential tools in the mathematical modelling of ecological systems, given their broad applicability in understanding complex interactions. This study examines the dynamics of a Gause-type predation model, incorporating assumptions that specialist predators compete for resources and that the prey population experiences an Allee effect. The model exhibits diverse dynamical behaviours through this ecological framework, including bi-stability, revealing the system’s intricate structure. The analysis highlights the existence of codimension one and codimension two bifurcations involving positive equilibria, such as saddle-node, Hopf, Bogdanov–Takens and Bautin bifurcations. The multifaceted dynamics of the system are further analysed across bi-parametric regions, represented through a variety of phase portraits. The ecological implications of these findings are discussed in detail to offer insights into the dynamic behaviours observed. Numerical simulations are also conducted to verify the analytical results, illustrating the model’s robustness and applicability.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835733","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

Variable range hopping conduction in yttrium–graphene oxide nanocomposites 钇-氧化石墨烯纳米复合材料的变范围跳变导电

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-16 DOI: 10.1140/epjb/s10051-025-00915-4

I. Dhanya, Nikhila Ann Abraham, Sreejith K. Pisharady, P. S. Jayalakshmi, Issac Johnson, Lekshmy Priya, K. Maheesha, Mohith K. Madhav

{"title":"Variable range hopping conduction in yttrium–graphene oxide nanocomposites","authors":"I. Dhanya, Nikhila Ann Abraham, Sreejith K. Pisharady, P. S. Jayalakshmi, Issac Johnson, Lekshmy Priya, K. Maheesha, Mohith K. Madhav","doi":"10.1140/epjb/s10051-025-00915-4","DOIUrl":"10.1140/epjb/s10051-025-00915-4","url":null,"abstract":"<div><p>The raw material, graphite powder, was processed by means of the modified Hummers’ method to yield graphene oxide (GO). The rare-earth yttrium (Y) ion was added to it in controlled concentrations to get Y–GO nanocomposites. The morphology of the samples was studied using transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analyses. Analysis of the TEM and SEM images revealed agglomerated nanoclusters of yttrium along with rolled sheets of graphene and wrinkled surface morphology for the samples. The structural analysis was done using X-ray diffraction studies (XRD) and compared with the standard data. The electron diffraction rings were indexed using selected area electron diffraction (SAED) with the help of CrysTBox software. The weight and atomic percentages of individual chemical constituents in the composites were analyzed using energy-dispersive X-ray (EDX) spectroscopy. The confocal Raman spectra of the samples provide helpful information on their optical band transitions. The UV–Vis reflectance spectral analysis supports the findings of the Raman studies. Additionally, DC electrical conductivity studies of the samples in the low-temperature region indicate their semiconducting nature, and the Arrhenius plots were used to determine their activation enthalpies. A comparative study of Mott variable range hopping (VRH) and its modified version, Efros–Shklovskii VRH, was applied in the low-temperature region to study the charge carrier transport properties of the samples.</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":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840503","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

Correction: Unveiling the thermoelectric potential of perthioborate MBS₃(M = Rb;Cs) compounds: insights from DFT calculations 更正：揭示过硫硼酸盐MBS₃（M = Rb;Cs）化合物的热电势：来自DFT计算的见解

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-11 DOI: 10.1140/epjb/s10051-025-00912-7

Garadi Fatima, Said Maabed, Hanifi Mebarki, Mohamed Halit, Chérif F. Matta, Lamin Ben Kamri Ahmed

引用次数: 0

Engineering optoelectronic properties of the Pb-free perovskite FASiBr3 − XIX (X = 0, 1, 2 or 3) for photovoltaic applications: first principle analysis 用于光伏应用的无铅钙钛矿FASiBr3−XIX （X = 0,1,2或3）的工程光电特性：第一性原理分析

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-11 DOI: 10.1140/epjb/s10051-025-00909-2

Youssef El Arfaoui, Mohammed Khenfouch, Nabil Habiballah, Simone Giusepponi

{"title":"Engineering optoelectronic properties of the Pb-free perovskite FASiBr3 − XIX (X = 0, 1, 2 or 3) for photovoltaic applications: first principle analysis","authors":"Youssef El Arfaoui, Mohammed Khenfouch, Nabil Habiballah, Simone Giusepponi","doi":"10.1140/epjb/s10051-025-00909-2","DOIUrl":"10.1140/epjb/s10051-025-00909-2","url":null,"abstract":"<div><p>Lead-free perovskites have become a potential candidate for the development of the photovoltaic field. Here, we explored the structural and optoelectronic characteristics of silicon-perovskite FASiBr<sub>3 − <i>X</i></sub>I<sub><i>X</i></sub> (<i>X</i> = 0, 1, 2 or 3) for solar device applications. Density functional theory has been applied. The band structure shows that FASiBr<sub>3</sub> FASiBr<sub>2</sub>I, FASiBrI<sub>2</sub> and FASiI<sub>3</sub> have a semiconductor nature with a direct band gap of (2.09 eV) (2.60 eV) PBE(HSE), (1.90 eV) (2.38 eV) PBE(HSE), (1.71 eV) (2.12 eV) PBE(HSE) and 1.60 eV (2.08) PBE(HSE), respectively. In addition, the studied perovskites also exhibited great optical properties including, high absorption; moreover, we showed that the substitution of Br by I in FASiBr<sub>3</sub> perovskite can considerably enhance the optical behavior. The dielectric function showed that the edge of absorption of Br-substituted I in FASiBr<sub>3</sub> perovskite was shifted towards the low energy zone (red-shift) compared to FASiBr<sub>3</sub>. As a result, FASiI<sub>3</sub> experiences greater absorption capability than its FASiBr<sub>3</sub> counterpart. These analyses indicate that FASiI3 is the best candidate for use as a Pb-free material for perovskite solar cells.</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":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00909-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822018","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

Publisher Correction: Structural, wettability, optical, and electrical modifications by varying precursor solutions of sprayed Co3O4 thin films for solar cell applications 发布者更正：结构，润湿性，光学和电学修改通过不同的前驱体溶液喷涂的Co3O4薄膜的太阳能电池应用

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-09 DOI: 10.1140/epjb/s10051-025-00901-w

Younes Nezzari, Warda Darenfad, Kamel Mirouh, Noubeil Guermat, Nadir Bouarissa

引用次数: 0

Machine learning in parameter estimation of nonlinear systems 非线性系统参数估计中的机器学习

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-09 DOI: 10.1140/epjb/s10051-025-00904-7

Kaushal Kumar, Ekaterina Kostina

{"title":"Machine learning in parameter estimation of nonlinear systems","authors":"Kaushal Kumar, Ekaterina Kostina","doi":"10.1140/epjb/s10051-025-00904-7","DOIUrl":"10.1140/epjb/s10051-025-00904-7","url":null,"abstract":"<p>Accurate parameter estimation in nonlinear dynamical systems remains a fundamental challenge due to noise, limited data, and model complexity. Traditional methods, such as gradient-based optimization and nonlinear least squares (NLS), often struggle under real-world multiplicative noise, exhibiting sensitivity to outliers and high computational demands. This study introduces a neural network framework integrating the Huber loss function to achieve robust and efficient parameter estimation. Applied to canonical dynamical systems, including damped oscillators, van der Pol oscillators, Lotka–Volterra models, and chaotic Lorenz dynamics, the proposed method demonstrates superior accuracy and resilience to noise. Notably, it maintains sub-<span>(1.2%)</span> relative errors for key parameters in the Lorenz system, significantly outperforming NLS, which diverges with errors exceeding <span>(12%)</span> under identical noise conditions. The use of SiLU activation improves convergence, yielding statistically significant reductions in estimation errors (<span>(p < 0.01)</span>). Furthermore, the framework operates up to <span>(8times )</span> faster than conventional optimization techniques while reducing root-mean-square error by over <span>(99.9%)</span> in high-noise regimes. These results establish a robust, data-driven approach for parameter estimation in complex dynamical systems, bridging machine learning with nonlinear physics and enabling real-time applications in noisy environments.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00904-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809151","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

Mixed quantum Ising–XY model on a Cayley tree of order two 二阶Cayley树上的混合量子Ising-XY模型

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-08 DOI: 10.1140/epjb/s10051-025-00905-6

Ali AlAali, Farrukh Mukhamedov

引用次数: 0

Phosphorene: an exceptional gas sensor with selective adsorption and distinctive I–V response for NH3, CH4, and H2S 磷化烯：一种对 NH3、CH4 和 H2S 具有选择性吸附和独特 I-V 响应的特殊气体传感器

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2025-04-08 DOI: 10.1140/epjb/s10051-025-00899-1

S. A. Hosseini

{"title":"Phosphorene: an exceptional gas sensor with selective adsorption and distinctive I–V response for NH3, CH4, and H2S","authors":"S. A. Hosseini","doi":"10.1140/epjb/s10051-025-00899-1","DOIUrl":"10.1140/epjb/s10051-025-00899-1","url":null,"abstract":"<div><p>Recent research on phosphorene synthesis, either single or multilayer, indicates that it has excellent potential for application in small structures. This study used sophisticated computations to examine the adhesion of CH<sub>4</sub>, H<sub>2</sub>S, and NH<sub>3</sub> molecules to a single layer of phosphorene. This study shows that phosphorene sensors are more effective at detecting certain chemicals than other comparable materials like graphene and MoS<sub>2</sub>. After determining the optimal locations for these molecules to bind to phosphorene, discovered that the molecule-to-phosphorene charge transfer is essential for phosphorene's high adsorption capacity. Using a particular method, computed the relationship between the drain current and gate voltage for various gas concentrations on phosphorene. The transport properties show significant changes in the armchair direction of phosphorene, which aligns with its unique electronic structure, indicating major changes in current–voltage behavior when gas molecules are added. High sensitivity to gas adsorption of phosphorene of phosphorene, makes it an excellent gas sensor and shows its potential for use in electronic devices. The structural and electronic calculations in this study were performed using density functional theory with LDA and GGA approximations. The LDA approximation was used for structural optimization, while the GGA approximation was employed for a more accurate description of intermolecular and van der Waals interactions.</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":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793162","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