The European Physical Journal Plus最新文献_第2页

Prigogine–Resibois master equation with power-law kernel: quantum dynamics with memory

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-04-02 DOI: 10.1140/epjp/s13360-025-06106-5

Vasily E. Tarasov

引用次数: 0

Dose comparison of slowing-down protons and secondary electrons by gold nanoparticle in proton therapy: simulation study

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-04-01 DOI: 10.1140/epjp/s13360-025-06197-0

Farshid Tabbakh

{"title":"Dose comparison of slowing-down protons and secondary electrons by gold nanoparticle in proton therapy: simulation study","authors":"Farshid Tabbakh","doi":"10.1140/epjp/s13360-025-06197-0","DOIUrl":"10.1140/epjp/s13360-025-06197-0","url":null,"abstract":"<div>A large number of researches on using gold nanoparticle in proton therapy have focused only on the effect of the secondary electrons in enhancing the radio-sensitization. Although experimental studies have addressed the significant impact of gold nanoparticles, simulations have shown that the electrons ejected from nanoparticles cause only a small enhancement within nanometer range from the nanoparticle, according to several publications. The disagreement has been explained in the present study by introducing the proton slowing-down mechanism as another contributor in dose enhancement in the presence of gold nanoparticles. The protons traversing the nanoparticles are slowed-down, leading to slight increase in their LET and, consequently, the extra dose induction in medium. This mechanism acts in a longer distance from gold nanoparticle within micrometer range. The contributions of both mechanisms to radio-sensitization enhancement have been compared, and the total elevated dose has been quantified. Additionally, the LET increase with respect to different nanoparticle sizes has been investigated.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749035","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

Formation and decay dynamics of (^{158})Tb(^{*}) compound nucleus formed in (^{6})Li+(^{152})Sm reaction

IF 2.8 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2025-04-01 DOI: 10.1140/epjp/s13360-025-06191-6

Rajni, Gudveen Sawhney, Ajay Kumar Rai, Manoj K. Sharma

{"title":"Formation and decay dynamics of (^{158})Tb(^{*}) compound nucleus formed in (^{6})Li+(^{152})Sm reaction","authors":"Rajni, Gudveen Sawhney, Ajay Kumar Rai, Manoj K. Sharma","doi":"10.1140/epjp/s13360-025-06191-6","DOIUrl":"10.1140/epjp/s13360-025-06191-6","url":null,"abstract":"<div>In the present analysis, the formation and the decay of (^{158})Tb(^{*}) compound nucleus formed via (^{6})Li +(^{152})Sm reaction is studied. The energy density functional theory based on the Skyrme effective interaction is used to calculate the nuclear potential. Within the frameworks of Wong and (ell)-summed Wong formula, the fusion process is examined and for the decay, the dynamical cluster decay model is used. The complete fusion cross-section shows decent agreement with experimental data with (ell)-summed Wong formula which otherwise indicate (sim)35(%) suppression at higher incident energies with Wong formula. The decay part of lanthanide compound nucleus (^{158})Tb(^{*}) is investigated using the concept of nuclear surface polarization effects (SPE) in which the complete fusion (CF) and incomplete fusion (ICF) dynamics is explored in view of fragmentation potential, preformation probability and penetrability of decaying fragments. The SPE is also tested on neck-length and barrier modification parameters. Along with this, the evaporation cross-sections in aforementioned decay processes are calculated using angle dependent and angle independent diffuseness parameter. Our results indicate that the SPE significantly influence the excitation functions and related dynamics of lanthanide compound nucleus as the experimentally reported CF and ICF cross-section for (^{158})Tb(^{*}) system are found to be nicely fitted when angle dependent diffuseness is incorporated in the nuclear potential.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749096","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

Impact of local and global awareness campaigns on malaria transmission: A mathematical model with protected human class and optimal control approach

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/s13360-025-06206-2

Fahad Al Basir, Juan J. Nieto, Aeshah A. Raezah, Teklebirhan Abraha

{"title":"Impact of local and global awareness campaigns on malaria transmission: A mathematical model with protected human class and optimal control approach","authors":"Fahad Al Basir, Juan J. Nieto, Aeshah A. Raezah, Teklebirhan Abraha","doi":"10.1140/epjp/s13360-025-06206-2","DOIUrl":"10.1140/epjp/s13360-025-06206-2","url":null,"abstract":"<div>This article presents a mathematical model to study malaria transmission dynamics influenced by awareness campaigns and optimal control strategies. Protected human class is included as a model variable that can be increased by social media awareness and treatment, as a result, infected cases are reduced. The nonnegativity and boundedness of the solutions of the model are analyzed. The proposed model possesses two equilibria, namely the disease-free equilibrium and the endemic equilibrium point. The disease-free equilibrium point is stable when the basic reproduction number, ({mathcal {R}}_0<1) and endemic equilibrium exists when ({mathcal {R}}_0>1). Consequently, forward bifurcation occurs at ({mathcal {R}}_0=1). Sensitivity analysis is provided which identifies the more important parameters of the model system related to the disease transmission. Finally, optimal control theory has been applied to maximize the number of protected human and minimize the cost of malaria management. The optimal problem comprises of three control parameters, and it is solved using the ‘maximum principle.’ This study concluded that public awareness is important for malaria control, and a combination of awareness-based interventions such as use of bed nets, spraying insecticides, and treatment can optimally increase the protected human as well as minimize the malaria cases cost-effectively.</div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740825","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

Biaxiality dependence of helical pitch, spontaneous polarization and tilt angle in the chiral smectic-C phase of the smectic-A to chiral smectic-C phase transition

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/s13360-025-06205-3

Prabir K. Mukherjee

引用次数: 0

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

引用次数: 0

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