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

Physical aspects of the deformation of (mathbb {Z}_2) kinks in a generalized (phi ^4) model

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-31 DOI: 10.1140/epjp/s13360-025-06203-5

F. C. E. Lima, C. A. S. Almeida, Rodolfo Casana

引用次数: 0

Revisiting the boundary conditions for a Morris-Thorne wormhole

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-31 DOI: 10.1140/epjp/s13360-025-06238-8

Peter K. F. Kuhfittig

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The rotational relaxation of ro-vibrationally excited H2(1,11) in collision with N2

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-29 DOI: 10.1140/epjp/s13360-025-06196-1

Jing Liu, Nurali Habibulla, Lin Mao

{"title":"The rotational relaxation of ro-vibrationally excited H2(1,11) in collision with N2","authors":"Jing Liu, Nurali Habibulla, Lin Mao","doi":"10.1140/epjp/s13360-025-06196-1","DOIUrl":"10.1140/epjp/s13360-025-06196-1","url":null,"abstract":"<div>The collisional energy relaxation behavior of the H2(v = 1, J = 11) molecule in an H2-N2 mixture was investigated at 300 K using a coherent anti-Stokes Raman spectroscopy technique, focusing on its near-resonant rotation-vibration dynamics. The pressure of the H2-N2 mixture is maintained at 500 Torr, while the molar ratios of N2 molecules are, respectively, adjusted to 0.2, 0.4, 0.5, 0.6, and 0.7. The H2(1,11) molecule is selectively excited through a stimulated Raman pumping technique, and the time-resolved CARS signal is observed from the J ≤ 11 rotational level of H2 molecules following collisions with N2. The results indicate that the rotational relaxation of H2(1,11) molecule involves both the multi-quantum relaxation process triggered by H2-H2 collisions and the single-quantum relaxation process via H2-N2 collisions. The rate coefficient for self-relaxation of H2-H2 collisions is (1.35 ± 0.14) × 10–14 cm3s−1, whereas the relaxation rate coefficient for H2-N2 collisions is (2.77 ± 0.27) × 10–14 cm3s−1. As the molar ratio of N2 increases, the continuous single-quantum relaxation of H2(1,11) molecules with J = 11 → 9 → 7 gradually becomes more pronounced. The rotational temperature of H2 with various N2 molar ratios is determined by the relative populations of a rotational Boltzmann distribution. When the molar ratio of N2 is small, the rotation temperature decreases at a faster rate primarily due to the rapid multi-quantum relaxation resulting from near-resonant collisions between H2-H2.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726633","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

Neodymium ion-doped borate-silicate glass: a thorough analysis for applications in optical and protective radiation

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-29 DOI: 10.1140/epjp/s13360-025-06194-3

Aljawhara Almuqrin, Jamelah S. Al-Otaibi, Norah Alwadai, Badriah Albarzan, M. S. Shams, Yasser S. Rammah, R. A. Elsad

{"title":"Neodymium ion-doped borate-silicate glass: a thorough analysis for applications in optical and protective radiation","authors":"Aljawhara Almuqrin, Jamelah S. Al-Otaibi, Norah Alwadai, Badriah Albarzan, M. S. Shams, Yasser S. Rammah, R. A. Elsad","doi":"10.1140/epjp/s13360-025-06194-3","DOIUrl":"10.1140/epjp/s13360-025-06194-3","url":null,"abstract":"<div>In this study, neodymium (Nd)-doped bismuth borosilicate glasses were produced using a melting-quenching technique. The glass density rose, and molar volume fell as the Nd3+ ion concentration rose. The influence of Nd substitution on radiation shielding as well as optical properties was investigated. The Phy-X/PSD as well as XCOM programs are used to study radiation shielding properties in the gamma-photon energy band of 0.015: 10 MeV. As the Nd2O3 concentration increased, the band gap (EOPT) levels dropped from 3.221 toward 3.051 eV during the direct transition as well as from 2.622 to 1.855 eV during the indirect transition. As Nd quantity increased, the molar refractivity rose from 19.497 to 21.106 cm3/mol and the refractive index improved from 2.50 to 2.80. The Nd2O3 addition to the glasses led to higher MAC and LAC values. The sample with the highest neodymium doping (Nd-1.2) had the lowest mean free path as well as half-value layer. This demonstrated how neodymium enhances glasses’ capacity to reduce photon radiation. The glass system is suggested as a shielding material in terms of photon attenuation.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726630","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

Multi-components fluid in f(R, T) gravity with observational constraints

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-28 DOI: 10.1140/epjp/s13360-025-06200-8

Bhupendra Kumar Shukla, Shambel Sahlu, Değer Sofuoğlu, Preeti Mishra, Alnadhief H. A. Alfedeel

{"title":"Multi-components fluid in f(R, T) gravity with observational constraints","authors":"Bhupendra Kumar Shukla, Shambel Sahlu, Değer Sofuoğlu, Preeti Mishra, Alnadhief H. A. Alfedeel","doi":"10.1140/epjp/s13360-025-06200-8","DOIUrl":"10.1140/epjp/s13360-025-06200-8","url":null,"abstract":"<div>In this paper, the accelerating expansion of the universe has been investigated in the multi-components fluid in the coupling of geometry with matter alternative theory f(R, T) gravity, where the gravitational Lagrangian is given by an arbitrary function of the Ricci scalar R and of the trace of the stress-energy tensor T. To address the late-time accelerating universe, we solve the Friedmann equations via the nonzero divergence of the energy-momentum tensor considered in the presence of a multi-component fluid. The best-fit values of the model parameters are determined using the Markov Chain Monte Carlo (MCMC) simulation using the cosmic chronometers (CC) dataset, which consists of 31 points and the recent Pantheon+ analysis of 1701 light curves of 1550 distinct Type Ia supernovae (SNIa) ranging in redshift from (z = 0.001) to 2.26. The trajectory of the deceleration parameter indicates that the universe has transitioned from a deceleration phase to an acceleration phase. We also look into the behavior of the jerk and snap parameters, the statefinder analysis, the om diagnostic, and the effective EoS parameter. It is shown that the model considered is consistent with the accelerating universe and the predictions of the quintessence model at present.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06200-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716886","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

Physics of the transition to detonation of gaseous flames

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-28 DOI: 10.1140/epjp/s13360-025-06192-5

Paul Clavin

引用次数: 0

Unveiling new quiescent dark and singular solitary solutions of the Fokas–Lenells equation

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-27 DOI: 10.1140/epjp/s13360-025-06198-z

Şebnem Gökdeniz Sıvakcı, Yakup Yıldırım, Aydın Seçer

{"title":"Unveiling new quiescent dark and singular solitary solutions of the Fokas–Lenells equation","authors":"Şebnem Gökdeniz Sıvakcı, Yakup Yıldırım, Aydın Seçer","doi":"10.1140/epjp/s13360-025-06198-z","DOIUrl":"10.1140/epjp/s13360-025-06198-z","url":null,"abstract":"<div>This paper investigates novel quiescent solitary waves in the Fokas–Lenells equation, a vital and versatile model in nonlinear dynamics used to describe wave propagation phenomena in optical fibers, plasma physics, and fluid systems. The Fokas–Lenells equation is notable for its ability to capture nonlinear and dispersive effects, making it a cornerstone for understanding complex wave behaviors in various physical contexts. By employing advanced analytical techniques, we derive new classes of dark and singular solitons. These solutions, previously unexplored in the context of the Fokas–Lenells equation, significantly enhance the repertoire of soliton solutions available for this nonlinear system. The novelty of this study lies in the systematic application of these diverse methods, providing a comparative analysis that underscores their respective strengths and practical advantages in addressing nonlinear evolution equations. The derived solutions not only demonstrate the efficacy and versatility of these techniques, but also reveal intricate dynamics inherent to the Fokas–Lenells equation. The physical significance of the newly obtained solutions is thoroughly examined, highlighting their relevance in describing interactions of waves in nonlinear optical and fluid systems. Such insights are crucial for advancing theoretical models and practical applications in fields where nonlinear wave phenomena are prominent. This study contributes to the ongoing development of soliton theory by extending the analytical framework used for solving the Fokas–Lenells equation, deepening the theoretical understanding of this model, and laying the groundwork for future explorations into soliton behaviors and nonlinear science.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06198-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716979","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

Dynamic properties of soliton solutions for the generalized KDKK and BK equations

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-26 DOI: 10.1140/epjp/s13360-025-06218-y

Deniu Yang

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Oral cavity damage as a potential health risk from germicidal UV lamp use in occupational and emergency situations

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-26 DOI: 10.1140/epjp/s13360-025-06190-7

Vincenzo Camisa, Salvatore Zaffina, Elena Solfaroli Camillocci, Davide Ciucci, Gian Marco Contessa, Emanuele Coscia, Reparata Rosa Di Prinzio, Annapaola Santoro, Maria Rosaria Vinci, Massimo Borra, Vittorio Cannatà

{"title":"Oral cavity damage as a potential health risk from germicidal UV lamp use in occupational and emergency situations","authors":"Vincenzo Camisa, Salvatore Zaffina, Elena Solfaroli Camillocci, Davide Ciucci, Gian Marco Contessa, Emanuele Coscia, Reparata Rosa Di Prinzio, Annapaola Santoro, Maria Rosaria Vinci, Massimo Borra, Vittorio Cannatà","doi":"10.1140/epjp/s13360-025-06190-7","DOIUrl":"10.1140/epjp/s13360-025-06190-7","url":null,"abstract":"<div>The increasing needs for protection from COVID-19 pandemic and biological-related risks together with the broader availability of new technologies have led to a widespread use of UV germicidal lamps in many contexts. Safety is a major concern in the use of these devices especially in emergency situations. Skin and eye are commonly recognized as target organs for exposure to ultraviolet radiation (UVR). Nevertheless, adverse effects were also observed in the oral cavity of two healthcare workers after an accidental exposure to a germicidal lamp in hospital pharmacy. An experimental on-the-field study was set up to provide a risk assessment of accidental UVR exposure in the oral cavity. An adult manikin was adapted to reproduce real exposure in different postures. The oral cavity was exposed for 30 min (half of the time the workers spent at the workstation). The accumulated radiant energy per unit area was slightly above the limit for human biologically effective radiant exposure to UVR of eyes and skin within an 8-h period according to the ICNIRP guideline (30 J/m2). A UV-C exposure > 100 J/m2 was assessed in correspondence to the lips of the manikin. The high humidity presents in the oral cavity and the absence of the stratum corneum in some areas might enhance the epithelium photo-damage due to UV-C, highlighting a potential risk of adverse effects to the oral cavity from exposure to artificial sources of UV-C radiation. Specific UVR exposure limits for the oral mucosa could be developed to prevent and protect workers’ health.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06190-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707112","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

Constraining quintessence field dynamics with recent cosmological observations

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-03-26 DOI: 10.1140/epjp/s13360-025-06082-w

Shraddha Dubey, Sudha Agrawal, Aroonkumar Beesham, Değer Sofuoğlu, Bhupendra Kumar Shukla

{"title":"Constraining quintessence field dynamics with recent cosmological observations","authors":"Shraddha Dubey, Sudha Agrawal, Aroonkumar Beesham, Değer Sofuoğlu, Bhupendra Kumar Shukla","doi":"10.1140/epjp/s13360-025-06082-w","DOIUrl":"10.1140/epjp/s13360-025-06082-w","url":null,"abstract":"<div>We present an investigation of a scalar field dark energy model in the context of the FLRW universe, focusing on the parameterization of the deceleration parameter q(z) to study the evolution of cosmic acceleration. By employing extensive observational datasets—including 30 independent cosmic chronometer measurements, 17 additional baryon acoustic oscillation data points, and standard candle datasets from Pantheon Type Ia supernovae, Quasars, and Gamma-Ray Bursts—we provide constraints on cosmological parameters using advanced Markov chain Monte Carlo methods. Our analysis identifies a transition redshift of (z_t = 0.62), marking the shift from decelerated to accelerated expansion, with a current deceleration parameter of (q_0 = -0.59). The equation of state parameter confirms the dynamical behavior of quintessence, deviating slightly from a cosmological constant. Furthermore, the model demonstrates strong consistency with (Lambda )CDM at lower redshifts while revealing distinct deviations at higher redshifts, which provides valuable insights into the late-time dynamics of the universe. By examining the evolution of cosmography parameters, energy density, pressure, and the scalar field equation of state, this study contributes the relevance of scalar field models as promising candidates for dark energy.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06082-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707129","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