The European Physical Journal Plus最新文献_第3页

Evaluation of kinetic freeze-out properties in different relativistic heavy-ion collision systems at (sqrt{s_{NN}}=200) GeV 在 (sqrt{s_{NN}}=200) GeV 下评估不同相对论重离子碰撞系统的动力学冻结特性

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-01 DOI: 10.1140/epjp/s13360-025-06119-0

Muhammad Waqas, Muhammad Ajaz, Jihane Ben Slimane, Murad Badshah, Haifa I. Alrebdi, Abd Al Karim Haj Ismail

{"title":"Evaluation of kinetic freeze-out properties in different relativistic heavy-ion collision systems at (sqrt{s_{NN}}=200) GeV","authors":"Muhammad Waqas, Muhammad Ajaz, Jihane Ben Slimane, Murad Badshah, Haifa I. Alrebdi, Abd Al Karim Haj Ismail","doi":"10.1140/epjp/s13360-025-06119-0","DOIUrl":"10.1140/epjp/s13360-025-06119-0","url":null,"abstract":"<div><p>We present our analysis of the identified hadrons (<span>(pi ^+)</span>, <span>(K^+)</span>, and <i>p</i>) kinetic freeze-out properties in relativistic collisions at <span>(sqrt{s_{NN}} = 200)</span> GeV. We analyze the transverse momentum spectra of these hadrons across various collision systems, such as copper–copper (<span>(Cu-Cu)</span>), zirconium–zirconium (<span>(Zr-Zr)</span>), ruthenium–ruthenium (<span>(Ru-Ru)</span>), uranium–uranium (<span>(U-U)</span>), and gold–gold (<span>(Au-Au)</span>) collisions, in distinct centrality intervals at the same center-of-mass energy using the modified Hagedorn model with embedded flow. The freeze-out parameters, namely the kinetic freeze-out temperature (<span>(T_0)</span>), transverse flow velocity (<span>(beta _T)</span>), and the entropy-related parameter (<i>n</i>), are extracted. Taking <span>(T_0)</span> and <span>(beta _T)</span> as common, it is observed that in all the above collisions, <span>(T_0)</span>, <span>(beta _T)</span>, and the parameter <i>n</i> diminish toward the periphery and are greater in central collisions. However, <span>(T_0)</span> in central collisions across all the systems remains unchanged, indicating a phase transition from hadronic matter to quark–gluon plasma. Furthermore, the temperature required for the phase transition across various systems is different. Large systems exhibit a shift in the potential start of the phase transition in peripheral collisions, which is intriguing. We also observe a direct relation between the extracted parameters and the system’s size.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527629","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

Molecular dynamics insight into polymer adsorption on HOP graphene: influence of defects, configuration, and multi-walled structures

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-01 DOI: 10.1140/epjp/s13360-025-06117-2

Xiaohui Ren, Yao Jiang

{"title":"Molecular dynamics insight into polymer adsorption on HOP graphene: influence of defects, configuration, and multi-walled structures","authors":"Xiaohui Ren, Yao Jiang","doi":"10.1140/epjp/s13360-025-06117-2","DOIUrl":"10.1140/epjp/s13360-025-06117-2","url":null,"abstract":"<div><p>Non-equilibrium molecular dynamics (NEMD) simulations are employed to investigate the adsorption behavior of various polymer chains on the surface of hexagon–octagon–pentagon (HOP) graphene, a novel two-dimensional carbon material. This study focuses on polymers such as aramid and poly(phenylene oxide) (PPO), analyzing critical parameters including interaction energy and radius of gyration. The research examines factors such as nanotube length, radius, defect percentage, and the configuration of HOP graphene (armchair versus zigzag). Additionally, the effects of double-walled nanotubes and the influence of wall number on interaction energy are explored. The results show that interaction energy increases with nanotube length, radius, and the number of walls, while it decreases with higher defect percentages. Polymer type has minimal impact, with similar values for aramid and PPO in both armchair and zigzag configurations. Interaction energy is higher for zigzag HOP graphene than armchair, and in double-walled structures, zigzag in the inner layer enhances interaction energy more than armchair. The difference in interaction energy between armchair and zigzag decreases as the number of walls increases.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521586","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

Analysing Soret, Dufour, and activation energy effects on heat and mass transfer thin film flow of an MHD Williamson ternary hybrid nanofluid over a non-Darcy porous stretching surface

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-01 DOI: 10.1140/epjp/s13360-025-06103-8

Vishalkumar J. Prajapati, Ramakanta Meher

{"title":"Analysing Soret, Dufour, and activation energy effects on heat and mass transfer thin film flow of an MHD Williamson ternary hybrid nanofluid over a non-Darcy porous stretching surface","authors":"Vishalkumar J. Prajapati, Ramakanta Meher","doi":"10.1140/epjp/s13360-025-06103-8","DOIUrl":"10.1140/epjp/s13360-025-06103-8","url":null,"abstract":"<div><p>This study investigates the heat and mass transfer characteristics in the thin film flow of a radiative MHD Williamson ternary hybrid nanofluid (THNF) over an unsteady permeable stretching surface. This study examines the combined effects of Soret and Dufour diffusion, activation energy, and non-uniform heat absorption or generation on fluid dynamics within a non-Darcy porous medium at the surface. The THNF consists of <i>Cu</i>, <span>(Al_2O_3)</span>, and <span>(TiO_2)</span> nanoparticles suspended in an ethylene glycol–water base fluid, chosen for its superior thermal conductivity, and enhanced heat transfer characteristics. The problem’s governing equations (PDEs) are transformed into a system of nonlinear ODEs using similarity transformations and solved using the homotopy analysis method (HAM). The impacts of essential physical parameters on fluid velocity and temperature, nanoparticle concentration, skin friction coefficient, and heat and mass transfer rates are illustrated graphically and numerically. The heat transfer rate decreases with higher Dufour number values and increases with lower Soret number values. Conversely, the opposite behaviour is observed for mass transfer. Furthermore, a comparison investigation indicates that the THNF demonstrates markedly superior heat and mass transfer rates compared to binary hybrid and mono nanofluids.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521599","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

Tetra-Ball: design of a new type of extended energy range single-sphere neutron spectrometer

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-01 DOI: 10.1140/epjp/s13360-024-05949-8

M. A. Caballero-Pacheco, R. Bedogni, L. Russo, D. Dashdondog, A. I. Castro-Campoy, J. M. Gomez-Ros, M. Costa, E. Durisi, E. Mafucci, V. Monti, A. Pietropaolo

引用次数: 0

Exploring anomalous diffusion in ternary nanofluids: a Maxwell model incorporating viscous dissipation and Nield boundary bioconvection

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-01 DOI: 10.1140/epjp/s13360-025-06131-4

Amar B. Patil, Vishwambhar S. Patil, Govind R. Rajput, Mahadev Biradar

{"title":"Exploring anomalous diffusion in ternary nanofluids: a Maxwell model incorporating viscous dissipation and Nield boundary bioconvection","authors":"Amar B. Patil, Vishwambhar S. Patil, Govind R. Rajput, Mahadev Biradar","doi":"10.1140/epjp/s13360-025-06131-4","DOIUrl":"10.1140/epjp/s13360-025-06131-4","url":null,"abstract":"<div><p>This paper investigates the impact of double diffusion in a Maxwell ternary nanofluid flow, incorporating the effects of internal friction dissipation and resistive heating over a stretched sheet with Nield boundary conditions. The study also addresses the role of activation energy and thermal radiation. This study investigates the impact of utilizing a combination of three nanofluids in contrast to the use of a single nanofluid. In this experiment, the base fluid is water, whereas copper <span>(left( {{text{Cu}}} right))</span>, titanium oxide <span>(left( {{text{TiO}}_{2} } right))</span>, and aluminium oxide <span>(left( {{text{Al}}_{{2}} {text{O}}_{{3}} } right))</span> make up the ternary hybrid nanofluid. Following the similarity transformation, the partial differential equations were transformed into ordinary differential equations. Analytical solutions were obtained using the perturbation method. The findings demonstrate that the triple nanofluid outperforms the single nanofluid by enhancing both temperature and velocity. However, the inclusion of multiple nanoparticles may lead to increased viscosity of the base fluid, depending on particle concentration. While higher viscosity could raise the pumping power required in fluid systems, it may also enhance heat transfer due to greater interaction between the nanoparticles and the fluid. Results reveal that the inclusion of viscous dissipation significantly alters heat transfer characteristics, while bioconvection driven by microorganisms enhances mass transport and stability. The study further demonstrates how Nield boundary conditions regulate the interaction between heat and mass transfer mechanisms. These findings provide a deeper understanding of anomalous diffusion phenomena in complex fluids, offering potential applications in energy systems, biomedical technologies, and advanced material processing.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521585","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

Optimal performance of a heat engine for a parallelly connected two quantum dots

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-01 DOI: 10.1140/epjp/s13360-025-06143-0

Asmamaw Tesega

{"title":"Optimal performance of a heat engine for a parallelly connected two quantum dots","authors":"Asmamaw Tesega","doi":"10.1140/epjp/s13360-025-06143-0","DOIUrl":"10.1140/epjp/s13360-025-06143-0","url":null,"abstract":"<div><p>In this paper, we developed a model of a heat engine that consists of two single-level quantum dots that are coupled in parallel and sandwiched between two thermal reservoirs with varying chemical potentials and temperatures. The difference in chemical potential and temperature facilitates the cyclical movement of electrons and acts as a heat engine. We investigate how thermodynamic quantities like heat, work, and efficiency are evaluated as a function of scaled energy. We also carried out analytical and numerical solutions for optimum scaled energies and the corresponding optimum efficiency of the thermoelectric heat engine. Therefore, the two optimum efficiencies are constrained below by the efficiency at maximum power output (<span>(eta ^*)</span>), the Curzon-Ahlborn efficiency (<span>(eta _{CA})</span>), and above by the Carnot efficiency (<span>(eta _C)</span>). Besides, we assess the overall optimal performance of a heat engine by introducing a figure of merit. Based on the proposed figure of merit, our result shows that the second optimization criteria exhibits superior performance compared to the first optimization criteria across the full range of Carnot efficiency.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521598","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

Schwarzschild black-hole immersed in an electric or magnetic background in Entangled Relativity

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-02-28 DOI: 10.1140/epjp/s13360-025-06129-y

Olivier Minazzoli, Maxime Wavasseur

引用次数: 0

Switchable regulation of a polymodal auditory network with information transmission and phase synchronization 具有信息传输和相位同步功能的多模态听觉网络的可切换调节功能

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-02-28 DOI: 10.1140/epjp/s13360-025-06136-z

Guodong Huang, Shu Zhou, Yuan Chai, Suyuan Huang, Zhenpu Liu

{"title":"Switchable regulation of a polymodal auditory network with information transmission and phase synchronization","authors":"Guodong Huang, Shu Zhou, Yuan Chai, Suyuan Huang, Zhenpu Liu","doi":"10.1140/epjp/s13360-025-06136-z","DOIUrl":"10.1140/epjp/s13360-025-06136-z","url":null,"abstract":"<div><p>Switchable regulation plays an important role in information encoding in the nervous system. An appropriate level of chaotic activity can enhance the encoding of weak signals in neurons, the phenomenon known as chaotic resonance (CR). However, previous studies of CR focused on single neurons without polymodal network. Therefore, to investigate how chaotic activities of switchable regulation affect the transmission of weak signals and neuronal synchronization across multi-mode pathways, this paper proposes a polymodal auditory network, with communication function combining auditory neurons and central neurons. It is shown that regardless of the currents, electric fields, and magnetic fields, chaotic activity can effectively enhance the information transmission between neurons. The enhancement regulation of CR in information transmission is realized by controlling signal frequency and current intensity, regulating multi-mode pathways. Furthermore, the enhancement of phase synchronization in polymodal auditory networks by chaotic activities is revealed, and synchronization and de-synchronization between neurons can be achieved through the adjustment of relevant parameters or the switching of pathways. The research offers insights into how chaotic activities influence information transmission and phase synchronization within neural systems, and provides guidance for the switchable regulation of artificial biological synapses and the polymodal development of brain–computer interfaces.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513264","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

Internal complexity feature and similarity of the gamma monitoring time series acquired in the environment by two different detection systems

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-02-28 DOI: 10.1140/epjp/s13360-025-06139-w

Senada Avdic, Suad Kunosic

{"title":"Internal complexity feature and similarity of the gamma monitoring time series acquired in the environment by two different detection systems","authors":"Senada Avdic, Suad Kunosic","doi":"10.1140/epjp/s13360-025-06139-w","DOIUrl":"10.1140/epjp/s13360-025-06139-w","url":null,"abstract":"<div><p>The early warning network for continuous monitoring of radiation level in the environment provides the relevant information on the radiation levels in regular conditions and in case of a radiological or nuclear emergency. An automatic gamma radiation monitoring network in Bosnia and Herzegovina consists of two smaller systems based on the MFM-203 and GammaTRACER XL2 monitors. In order to investigate the comparability and reliability of the ambient dose equivalent rate data acquired at all the monitoring stations based on two different detection systems, we have quantified the natural fluctuations and internal features of the investigated time series. It was demonstrated that the data recorded at the GammaTRACER XL2 stations show the larger fluctuations compared to the data collected at the MFM-203 stations in the same period of time. We have applied the DTW measure as an advanced distance measure, and it was observed that two time series show the similarity since the DTW outputs obtained are within the DTW output ranges due to the natural fluctuations that were recorded with the same instrument. The results of the internal complexity feature analysis show that the gamma dose rate time series measured at the GammaTRACER XL2 stations are somewhat less random than the MFM-203 experimental time series. It was observed that there is an overlapping to some extent between the results of complexity dynamics analysis for both time series. The results of the present study show that all the ambient gamma dose rates measured with two different detection systems can be considered comparable and reliable. Such results are of interest for a proper interpretation of the background radiation level data acquired in the environment in regular conditions as well as in accidental situations.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521611","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

Liénard-Wiechert potentials due to a ‘classically’ spinning point-charge in non-relativistic arbitrary motion

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-02-27 DOI: 10.1140/epjp/s13360-025-06089-3

Nikhil D. Hadap

引用次数: 0