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Study on the characteristics of aeolian sand movement and accumulation at the east wall of Suoyang Ancient City based on CFD
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-08 DOI: 10.1140/epjp/s13360-025-06051-3
Wenwu Chen, Haiyu Wu, Shuai Zhang, Haoxin Chen, Qiang Qi, Chong Wu, Zhiqian Guo, Kebin Ren, Haitao Yan
{"title":"Study on the characteristics of aeolian sand movement and accumulation at the east wall of Suoyang Ancient City based on CFD","authors":"Wenwu Chen,&nbsp;Haiyu Wu,&nbsp;Shuai Zhang,&nbsp;Haoxin Chen,&nbsp;Qiang Qi,&nbsp;Chong Wu,&nbsp;Zhiqian Guo,&nbsp;Kebin Ren,&nbsp;Haitao Yan","doi":"10.1140/epjp/s13360-025-06051-3","DOIUrl":"10.1140/epjp/s13360-025-06051-3","url":null,"abstract":"<div><p>The frequent eolian processes in the northwest region of China pose a persistent threat to the conservation of earthen sites. Located in the “World Wind City” of Guazhou, Suoyang Ancient City experiences maximum wind velocities of 24 m/s, leading to severe sand accumulation and damage to its walls. This study focused on a typical 70-m-long section of the east wall of Suoyang Ancient City, featuring a gap, and utilized unmanned aerial vehicle (UAV)-assisted modeling technology to construct a three-dimensional model of the wall. Computational fluid dynamics (CFD) methods were employed to simulate the movement and accumulation processes of wind-blown sand. The research found that upward airflow at the upper part of the wall enables sand particles to surmount the wall's top, while downward airflow at the lower part accelerates the downward deposition of sand particles at the base of the wall. The wind field on the windward side is evenly distributed, resulting in relatively uniform sand deposition. Conversely, on the leeward side, a reflux zone forms after the airflow passes over the wall, causing sand particles to accumulate in an arc-shaped pattern behind the wall. The simulated results align with actual observations of sand accumulation at the gap in the east wall, providing valuable insights for sand prevention and control efforts at the Suoyang Ancient City.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143370050","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
Production of continuous carbon nanotube/geopolymer composite fibers by wet spinning for adsorption applications
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-08 DOI: 10.1140/epjp/s13360-025-06034-4
Yifeng Zhu, Boxiao Rao, Zhenquan Zhao, Ting Zheng, Weijie Qu, Xiaodong Wang, Yingyi Liu, Chengying Bai, Paolo Colombo
{"title":"Production of continuous carbon nanotube/geopolymer composite fibers by wet spinning for adsorption applications","authors":"Yifeng Zhu,&nbsp;Boxiao Rao,&nbsp;Zhenquan Zhao,&nbsp;Ting Zheng,&nbsp;Weijie Qu,&nbsp;Xiaodong Wang,&nbsp;Yingyi Liu,&nbsp;Chengying Bai,&nbsp;Paolo Colombo","doi":"10.1140/epjp/s13360-025-06034-4","DOIUrl":"10.1140/epjp/s13360-025-06034-4","url":null,"abstract":"<div><p>Porous geopolymers are highly regarded for dye and heavy metal adsorption due to their porous structure, versatile raw material options, and excellent chemical and thermal stability. Additionally, fiber-based adsorbents offer superior adsorption performance, with enhanced flexibility, adaptability, and a high surface area. In this study, pure geopolymer and carbon nanotubes (CNTs)/geopolymer continuous composite microfibers, with a diameter of ~ 300 µm, were synthesized using a wet spinning method. Sodium alginate (SA) was utilized as a dispersant, and a solution of 5% CaCl<sub>2</sub> in 75% ethanol served as the coagulation bath. The morphology, structure changes, specific surface area, mechanical properties and adsorption properties of these composite microfibers were thoroughly studied. The addition of CNTs enhanced both the mechanical strength and the adsorption performance of microfibers for methylene blue (MB). The tensile stress and Young’s modulus of the CNTs/geopolymer fibers reached 35.41 ± 1.09 MPa and 33.22 ± 0.99 MPa, respectively, with a CNTs content of 25 wt.%. In addition, the high MB removal rates (~ 84%) were achieved after 24 h when the initial concentration of MB was 10 mg/L. These findings suggest that the obtained CNTs/geopolymer continuous composite microfibers are promising materials for adsorption applications, particularly in flexible, braided, and complex-shaped adsorption materials.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361932","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
A Lanczos algorithm for computing split quaternion partial singular value decomposition and its application
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-07 DOI: 10.1140/epjp/s13360-025-06028-2
Tao Wang, Ying Li, Mingcui Zhang
{"title":"A Lanczos algorithm for computing split quaternion partial singular value decomposition and its application","authors":"Tao Wang,&nbsp;Ying Li,&nbsp;Mingcui Zhang","doi":"10.1140/epjp/s13360-025-06028-2","DOIUrl":"10.1140/epjp/s13360-025-06028-2","url":null,"abstract":"<div><p>Partial singular value decomposition (PSVD) is often used to deal with dimensionality reduction, compression and data approximation of large matrices to improve computational efficiency and simplify the analysis of complex data. In this paper, we will study the problem of PSVD of split quaternion matrix. By analyzing the structure of the real representation matrix, we find that it can preserve the partially unitary property. Based on the property of the real representation matrix, we propose split quaternion partial singular value decomposition (SQPSVD) and Lanczos algorithm of SQPSVD. In numerical examples, we verify the effectiveness of the Lanczos algorithm and propose the split quaternion color image model to apply the Lanczos algorithm to color image processing. The combination of the model and algorithm has a good performance in low rank approximation of color images, color face reconstruction and recognition. Moreover, based on the Lanczos algorithm, we propose the denoising algorithm for the space magnetic field measurement data and the experimental result shows the effectiveness of the denoising algorithm.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361874","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
Preserving the rheological equation of Eyring-Powell fluid through non-similar approach: a numerical analysis by BSCM
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-07 DOI: 10.1140/epjp/s13360-024-05941-2
Mojeed T. Akolade, Amos S. Idowu, Timothy L. Oyekunle, Samson A. Agunbiade, Hafizat O. Momoh, Moses S. Dada, Emmanuel O. Titiloye, Jos U. Abubakar, Olanrewaju T. Olotu
{"title":"Preserving the rheological equation of Eyring-Powell fluid through non-similar approach: a numerical analysis by BSCM","authors":"Mojeed T. Akolade,&nbsp;Amos S. Idowu,&nbsp;Timothy L. Oyekunle,&nbsp;Samson A. Agunbiade,&nbsp;Hafizat O. Momoh,&nbsp;Moses S. Dada,&nbsp;Emmanuel O. Titiloye,&nbsp;Jos U. Abubakar,&nbsp;Olanrewaju T. Olotu","doi":"10.1140/epjp/s13360-024-05941-2","DOIUrl":"10.1140/epjp/s13360-024-05941-2","url":null,"abstract":"<div><p>To preserve the rheological equation of the non-Newtonian Eyring-Powell (EP) fluid, present mixed convection problem is simplified via non-similar approach, as opposed to the widely used similarity technique, while the dynamics are numerically investigated through bivariate spectral collocation method (BSCM). Studies identify that variations in free stream velocity, surface mass transfer, wall temperature, buoyancy forces, magnetization, chemical reactions, etc are factors responsible for the non-similar boundary layer problem (N-SBLP). However, the assumptions in this study including dissipative heat, a Darcian medium, non-Newtonian fluid, nonlinear buoyancy, convective heat transfer, chemical reaction rates, and Soret–Dufour effects give rise to the N-SBLP, thus necessitating the use of the non-similar technique. The numerical method adopts a modified spectral Chebyshev-based collocation method (a bi-discretization scheme) known as the BSCM, capable of handling systems of partial differential equations (PDEs). The governing mathematical model of the flow, heat, and mass transfer is presented in the form of PDEs, transformed into dimensionless N-SBLP equations, and solved numerically. The results of the physical quantities confirm the preservation of the rheological properties of the EP fluid, as demonstrated in the corresponding figures and tables. The findings highlight the successful application of the non-similar approach and BSCM to the N-SBLP of EP fluid. A rise in the Dufour number indicates a stronger influence of mass diffusion on thermal energy transfer, while increasing the Eyring-Powell fluid’s dimensionless parameters and quadratic buoyancy enhances fluid motion, improves mass transfer, reduces temperature profiles, and thins boundary layers due to stronger non-Newtonian and convective effects.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361875","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
Heat transfer analysis in membrane-based pumping flow of hybrid nanofluids
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-07 DOI: 10.1140/epjp/s13360-025-05987-w
Pankaj Jangid, Ashvani Kumar, Dharmendra Tripathi, Kalpna Sharma
{"title":"Heat transfer analysis in membrane-based pumping flow of hybrid nanofluids","authors":"Pankaj Jangid,&nbsp;Ashvani Kumar,&nbsp;Dharmendra Tripathi,&nbsp;Kalpna Sharma","doi":"10.1140/epjp/s13360-025-05987-w","DOIUrl":"10.1140/epjp/s13360-025-05987-w","url":null,"abstract":"<p>Hybrid nanofluids have emerged as a game-changer in thermal management, offering enhanced thermal conductivity, heat transfer, and fluid flow characteristics. By combining the benefits of different nanoparticles, hybrid nanofluids exhibit improved performance, making them an attractive solution for advanced thermal management systems. This study presents a comprehensive analysis of heat transfer in hybrid nanofluids propelled by membrane pumping and controlled by a radial magnetic field. A mathematical model is developed to investigate the thermal behaviour of copper–alumina/water nanofluid in a vertical microtube. By employing a lubrication approach, analytical solutions are derived for velocity profiles, temperature fields, and heat transfer characteristics. Results show significant enhancements in heat transfer rates due to the combined effects of membrane pumping and magnetic field. By using the MATLAB code, results for velocity profiles, volumetric flow rates, wall shear stress, stream functions, and pressure differences are illustrated. Additionally, heat transfer analysis for hybrid nanofluid (copper–alumina/water) flow is scrutinized, yielding insights into temperature, Nusselt numbers, and isotherms. The result reveals that the Nusselt number increases by 3.102% with higher alumina concentration<span>(left( {phi_{1} } right))</span>, while it decreases slightly from 3.102% to 3.098% as copper concentration <span>(left( {phi_{2} } right))</span> increases, which signifies that alumina nanoparticles are more effective than copper nanoparticles. The present study showcases the potential of the proposed model to transform biomedical sciences, particularly in the development of smart pumping devices. This research lays the groundwork for future investigations, aiming to harness the power of mathematical modelling to create innovative, patient-centred solutions.</p>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361876","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
Study on the electromagnetic properties of the ([sc] [{bar{q}} {bar{b}}]) and ([sc] [{bar{s}} {bar{b}}]) states with (J^P = 1^+)
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-06 DOI: 10.1140/epjp/s13360-025-06016-6
Ulaş Özdem
{"title":"Study on the electromagnetic properties of the ([sc] [{bar{q}} {bar{b}}]) and ([sc] [{bar{s}} {bar{b}}]) states with (J^P = 1^+)","authors":"Ulaş Özdem","doi":"10.1140/epjp/s13360-025-06016-6","DOIUrl":"10.1140/epjp/s13360-025-06016-6","url":null,"abstract":"<div><p>A systematic study of the electromagnetic properties of exotic states is conducted to elucidate their nature, which continues to be the subject of controversy and incomplete understanding in the field. In this study, the magnetic dipole and quadrupole moments of the tetraquarks <span>([sc] [{bar{q}} {bar{b}}])</span> and <span>([sc] [{bar{s}} {bar{b}}])</span> with <span>(J^P = 1^+)</span> are extracted in the context of a compact diquark-antidiquark configuration with the help of the QCD light-cone rules method. The magnetic dipole moments are given as <span>(mu _{[sc] [{bar{u}} {bar{b}}]} = -2.12^{+0.74}_{-0.59} mu _N)</span>, <span>(mu _{[sc] [{bar{d}} {bar{b}}]} = 1.66^{+0.60}_{-0.46} mu _N)</span>, and <span>(mu _{[sc] [{bar{s}} {bar{b}}]} = 2.01^{+0.61}_{-0.50} mu _N)</span>. The order of magnitude of the magnetic dipole moments would suggest that these outcomes may be achievable in forthcoming experiments. The magnetic and quadrupole moments of hadrons represent another important observable, along with their mass and decay width, contributing to our understanding of the underlying quark structure and dynamics. Therefore, we hope that the results of this study will prove useful in theoretical and experimental investigations, which we anticipate will be an interesting research topic.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06016-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362053","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
Angular momentum dependence of nuclear decay of radon isotopes by emission of (^{14})C nuclei and branching ratio relative to (alpha )-decay
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-06 DOI: 10.1140/epjp/s13360-025-06024-6
A. A. Atangana Likéné, J. E. Ndjana Nkoulou II,  Saïdou
{"title":"Angular momentum dependence of nuclear decay of radon isotopes by emission of (^{14})C nuclei and branching ratio relative to (alpha )-decay","authors":"A. A. Atangana Likéné,&nbsp;J. E. Ndjana Nkoulou II,&nbsp; Saïdou","doi":"10.1140/epjp/s13360-025-06024-6","DOIUrl":"10.1140/epjp/s13360-025-06024-6","url":null,"abstract":"<div><p>This study aims to provide new insights into the angular momentum dependence of <span>(^{14})</span>C-decay. To achieve this, we perform a systematic analysis of the radioactive decay of radon isotopes via <span>(^{14})</span>C cluster emission, employing the Wentzel–Kramers–Brillouin approximation and introducing the screened Kratzer–Morse potential as an innovative nuclear potential. While the <span>(^{14})</span>C emission from radon isotopes has not yet been identified experimentally, our study extends the classical theory of <span>(alpha )</span>-decay to predict half-lives and branching ratios for <span>(^{14})</span>C-decay in radon isotopes <span>(^{216-223})</span>Rn. The results of this work indicate that low angular momentum states favor <span>(^{14})</span>C emission, and the predicted half-lives are consistent with previous theoretical studies. On the other hand, the calculation of branching ratio relative to <span>(alpha -)</span>decay allowed us to quantify the probability of <span>(^{14})</span>C-decay channel for different values of <i>l</i>. The branching ratios suggest that radon isotopes belonging to the naturally occurring radioactive series are the most favorable regarding <span>(^{14})</span>C emission, especially the <span>(^{222}_{86})</span>Rn, which is prime candidate for potential experimental detection of <span>(^{14})</span>C emission. Due to limited experimental data on <span>(^{14})</span>C emission from radon isotopes, to validate our model we extended our calculations to other cluster decays with available half-lives, including <span>(^{14})</span>C, <span>(^{20})</span>O, <span>(^{22,24,26})</span>Ne, <span>(^{28,30})</span>Mg, and <span>(^{32})</span>Si emissions from heavy nuclei. Our predicted half-lives values for cluster emission are validated by experimental data, especially for low angular momentum values.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184837","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
Superior monogamy and polygamy relations and estimates of concurrence
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-05 DOI: 10.1140/epjp/s13360-025-06029-1
Yue Cao, Naihuan Jing, Kailash Misra, Yiling Wang
{"title":"Superior monogamy and polygamy relations and estimates of concurrence","authors":"Yue Cao,&nbsp;Naihuan Jing,&nbsp;Kailash Misra,&nbsp;Yiling Wang","doi":"10.1140/epjp/s13360-025-06029-1","DOIUrl":"10.1140/epjp/s13360-025-06029-1","url":null,"abstract":"<div><p>It is well known that any well-defined bipartite entanglement measure <span>(mathcal {E})</span> obeys <span>(gamma )</span>th-monogamy relations Eq. (1.1) and assisted measure <span>(mathcal {E}_{a})</span> obeys <span>(delta )</span>th-polygamy relations Eq. (1.2). Recently, we presented a class of tighter parameterized monogamy relation for the <span>(alpha )</span>th <span>((alpha ge gamma ))</span> power based on Eq. 1.1. This study provides a family of tighter lower (resp. upper) bounds of the monogamy (resp. polygamy) relations in a unified manner. In the first part of the paper, the following three basic problems are focused: </p><ol>\u0000 <li>\u0000 <span>(i)</span>\u0000 \u0000 <p>tighter monogamy relation for the <span>(alpha )</span>th (<span>(0le alpha le gamma )</span>) power of any bipartite entanglement measure <span>(mathcal {E})</span> based on Eq. (1.1);</p>\u0000 \u0000 </li>\u0000 <li>\u0000 <span>(ii)</span>\u0000 \u0000 <p>tighter polygamy relation for the <span>(beta )</span>th (<span>( beta ge delta )</span>) power of any bipartite assisted entanglement measure <span>(mathcal {E}_{a})</span> based on Eq. (1.2);</p>\u0000 \u0000 </li>\u0000 <li>\u0000 <span>(iii)</span>\u0000 \u0000 <p>tighter polygamy relation for the <span>(omega )</span>th (<span>(0le omega le delta )</span>) power of any bipartite assisted entanglement measure <span>(mathcal {E}_{a})</span> based on Eq. (1.2).</p>\u0000 \u0000 </li>\u0000 </ol><p> In the second part, using the tighter polygamy relation for the <span>(omega )</span>th (<span>(0le omega le 2)</span>) power of CoA, we obtain good estimates or bounds for the <span>(omega )</span>th (<span>(0le omega le 2)</span>) power of concurrence for any <i>N</i>-qubit pure states <span>(|psi rangle _{AB_{1}cdots B_{N-1}})</span> under the partition <span>(AB_{1})</span> and <span>(B_{2}cdots B_{N-1})</span>. Detailed examples are given to illustrate that our findings exhibit greater strength across all the region.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06029-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184819","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
Charged particle multiplicity fluctuation in (A-A) collisions at RHIC and LHC energies using Angantyr model
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-05 DOI: 10.1140/epjp/s13360-024-05930-5
Pritindra Bhowmick, Sadhana Dash, Basanta Kumar Nandi, Claude Pruneau
{"title":"Charged particle multiplicity fluctuation in (A-A) collisions at RHIC and LHC energies using Angantyr model","authors":"Pritindra Bhowmick,&nbsp;Sadhana Dash,&nbsp;Basanta Kumar Nandi,&nbsp;Claude Pruneau","doi":"10.1140/epjp/s13360-024-05930-5","DOIUrl":"10.1140/epjp/s13360-024-05930-5","url":null,"abstract":"<div><p>Event-by-event fluctuations of the charged particle multiplicity are studied for a wide range of centralities for Au−Au collisions at <span>(sqrt{s_{NN}} = 200hbox { GeV})</span>, Pb−Pb collisions at <span>(sqrt{s_{NN}} = 2.76hbox { TeV})</span> and 5.02 TeV using the Pythia8 Angantyr model. The centrality dependence of <span>(omega _{ch})</span> observable, which quantifies the fluctuations in terms of scaled variance, is studied for different pseudo-rapidity ranges and has been compared with those obtained from a simple participant superposition model. The <span>(omega _{ch})</span> was found to be lower than the expectations from the participant model. The estimate would act like a baseline for current and future measurements of event-by-event fluctuations in the charged particle multiplicities in systems at LHC energies where no de-confined medium of quarks and gluons are formed.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184820","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
Study of structures, electronic and spectral properties of anionic AuMgn− (n = 2–12) clusters
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-02-05 DOI: 10.1140/epjp/s13360-024-05908-3
Ru Deng Luo, Li Jun Wen, Hao Chen, Lei Chen, Ya Ru Zhao
{"title":"Study of structures, electronic and spectral properties of anionic AuMgn− (n = 2–12) clusters","authors":"Ru Deng Luo,&nbsp;Li Jun Wen,&nbsp;Hao Chen,&nbsp;Lei Chen,&nbsp;Ya Ru Zhao","doi":"10.1140/epjp/s13360-024-05908-3","DOIUrl":"10.1140/epjp/s13360-024-05908-3","url":null,"abstract":"<div><p>Using CALYPSO code and DFT calculations, the structures, stabilities, electronic and spectral properties of bimetallic AuMg<sub><i>n</i></sub><sup>−</sup> (<i>n</i> = 2–12) are comprehensively studied. It is shown that AuMg<sub><i>n</i></sub><sup>−</sup> clusters evolved from planar configuration to triangular pyramid-base structure, to triangular prism-base empty cage structure, and finally to filled cage motif. Large-sized AuMg<sub><i>n</i></sub><sup>−</sup> clusters are structurally different from their individual Mg clusters, indicating that doping atoms have a greater influence on their structure. The charge transfer from Mg to Au occurs in the AuMg<sub><i>n</i></sub><sup>−</sup> clusters. Stability analysis suggests prominent stability of AuMg<sub>3</sub><sup>−</sup> and AuMg<sub>9</sub><sup>−</sup>, which have 8 and 18 closed-shell electronic configurations. Bond length calculations show that AuMg<sub>3</sub><sup>−</sup> and AuMg<sub>9</sub><sup>−</sup> have a compact structure, meaning that there is a strong atomic interaction. The multi-center bond and Mayer bond order studies indicate a stronger Au–Mg interaction than the Mg–Mg interaction. The spectral properties based on the PES, IR, and Raman spectra have also been discussed.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143184775","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
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