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

Tailoring the dielectric performance and optical bandgap of PMMA/PVC nanocomposite blends via zeolite nanofiller integration 通过沸石纳米填料集成定制PMMA/PVC纳米复合材料共混物的介电性能和光学带隙

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-25 DOI: 10.1140/epjp/s13360-026-08190-7

Aeshah Salem, Fatemah H. Alkallas, Azizah A. Algreiby, Amira Ben Gouider Trabelsi, Wafaa B. Elsharkawy, Arafat Toghan, Ayman A. O. Younes, Ayman M. Mostafa, Eman A. Mwafy

{"title":"Tailoring the dielectric performance and optical bandgap of PMMA/PVC nanocomposite blends via zeolite nanofiller integration","authors":"Aeshah Salem, Fatemah H. Alkallas, Azizah A. Algreiby, Amira Ben Gouider Trabelsi, Wafaa B. Elsharkawy, Arafat Toghan, Ayman A. O. Younes, Ayman M. Mostafa, Eman A. Mwafy","doi":"10.1140/epjp/s13360-026-08190-7","DOIUrl":"10.1140/epjp/s13360-026-08190-7","url":null,"abstract":"<div><p>Eco-friendly PMMA/PVC/zeolite nanocomposite films were effectively produced by a solution-casting method utilizing a 50:50 PMMA/PVC blend reinforced with 3, 6, and 9 wt% natural zeolite. The impact of zeolite integration on the structural, morphological, optical, and dielectric properties of the resultant films was methodically assessed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-visible diffuse reflectance spectroscopy (UV–Vis DRS), and broadband dielectric spectroscopy (BDS). FTIR and XRD analyses validated robust polymer–filler interfacial interactions and the maintenance of the PMMA/PVC matrix’s primarily amorphous characteristics, whereas FESEM micrographs demonstrated a gradual transition toward a denser, more interconnected morphology with increasing zeolite loading. Optical tests revealed a concentration-dependent enhancement in reflectance and refractive index, along with significant reductions in the indirect and direct optical band gaps from 3.11 to 2.69 eV and from 4.28 to 2.78 eV, respectively, at 9 wt% zeolite. Dielectric study revealed a demanding moderate dielectric loss, enhanced permittivity, and high Q at operational frequencies, and interfacial polarization attributed to the porous aluminosilicate structure of zeolite and the expanded polymer–filler interfacial area. The PMMA/PVC-9 wt% zeolite nanocomposite demonstrated the most advantageous optoelectrical performance across all compositions, underscoring the efficacy of zeolite as a sustainable nanofiller for sophisticated flexible dielectric, insulating, and energy-storage applications.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837927","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

Bound states of one-dimensional helium on the half-line 一维氦的束缚态在半线上

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-25 DOI: 10.1140/epjp/s13360-026-08186-3

Dmitry A. Konovalov

{"title":"Bound states of one-dimensional helium on the half-line","authors":"Dmitry A. Konovalov","doi":"10.1140/epjp/s13360-026-08186-3","DOIUrl":"10.1140/epjp/s13360-026-08186-3","url":null,"abstract":"<div><p>We report a non-relativistic solution of the one-dimensional helium atom confined to the half-line, with electron coordinates <span>(r_1,r_2>0)</span>. Using a variational product basis of Laguerre functions with dimension up to <span>(N = 45)</span>, we obtained convergence of the first four bound-state energies to six significant digits: <span>(-2.10839)</span>, <span>(-2.05037)</span>, <span>(-2.02901)</span>, and <span>(-2.01884)</span> atomic units. Despite the theoretical spin and exchange-symmetry degeneracy, we observed a numerical anomaly in which the symmetric (singlet) states converge drastically more slowly than the antisymmetric (triplet) states, potentially requiring basis sizes exceeding <span>(N=1000)</span> to reach the same triplet energies. With <span>(N=45)</span>, the symmetric energies converged only to the first four significant digits. However, in practice this difficulty could be easily bypassed by making the rapidly convergent antisymmetric wedge (energy <span>(-2.10837)</span> at only <span>(N=20)</span>) and then building the symmetric partner exactly by reflection. The energy spectrum and wave function plots revealed a clear Rydberg-like ladder of two-electron configurations, characterized by a (1<i>s</i>, <i>ns</i>) nodal structure.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-026-08186-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837656","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

Observational constraints on cosmic evolution in f(Q) gravity using logarithmic Om(z) parametrization 使用对数Om(z)参数化的f(Q)重力下宇宙演化的观测约束

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-25 DOI: 10.1140/epjp/s13360-026-08200-8

Kshetrimayum Govind Singh, Kangujam Priyokumar Singh

引用次数: 0

Performance analysis of recycled plastic-based composites for gamma radiation attenuation 再生塑料基复合材料γ辐射衰减性能分析

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-25 DOI: 10.1140/epjp/s13360-026-08176-5

Hanaa A. Alshammari, Ahmed Hassan Korna, Soad Saad Fares, Badriah Alshahrani

{"title":"Performance analysis of recycled plastic-based composites for gamma radiation attenuation","authors":"Hanaa A. Alshammari, Ahmed Hassan Korna, Soad Saad Fares, Badriah Alshahrani","doi":"10.1140/epjp/s13360-026-08176-5","DOIUrl":"10.1140/epjp/s13360-026-08176-5","url":null,"abstract":"<div><p>This study evaluates the fabrication and performance of lead-free radiation shielding composites utilizing upcycled post-consumer plastic waste. Sustainable composites were fabricated utilizing a recycled high-density polyethylene (r-HDPE) matrix reinforced with bismuth oxide (Bi<sub>2</sub>O<sub>3</sub>) and tungsten oxide (WO<sub>3</sub>) nanoparticles (10–30 wt%). Microstructural and X-ray diffraction analysis verified that high-shear twin-screw compounding-maintained stoichiometry and preserved filler crystallinity, which is critical for supporting photoelectric absorption cross-sections. Mechanical characterization demonstrated rigidification of the matrix; a reinforcement effect at 10 wt% increased tensile strength to 24.1 ± 0.8 MPa. The inorganic fillers acted as thermal stabilizers, with the 30 wt% Bi<sub>2</sub>O<sub>3</sub> composites shifting the decomposition onset temperature by 72 °C compared to the neat polymer. Radiological testing validated a measurable enhancement in shielding efficacy across a spectrum of 59.5–1332 keV. The 30 wt% composites achieved over 60% radiation protection efficiency (RPE) at diagnostic energies (59.5 keV), driven by K-edge energy range exploitation. Benchmarking against traditional bulk materials indicated that the Bi<sub>2</sub>O<sub>3</sub> composite provides a 20% thickness reduction compared to ordinary concrete and comparable mass efficiency to lead glass, while facilitating a 40% total weight reduction in portable shielding designs. Life cycle assessment (LCA) showed these composites reduce embodied energy by 30% compared to virgin polymers and maintain 90% shielding efficiency after three melt-reprocessing cycles. These findings suggest that these non-toxic, durable composites are a viable option for radiation protection applications within a circular economy framework.</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":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837655","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

The bottom quark mass at high scale 高尺度下的底夸克质量

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-25 DOI: 10.1140/epjp/s13360-026-08035-3

Juan Ramírez Alfaro, María Moreno Llácer, Marcel Vos

引用次数: 0

Thermoelectric properties of the two-dimensional Al(_2)Si(_2)S(_2) monolayer from first-principles calculations 二维Al (_2) Si (_2) S (_2)单层热电性质的第一性原理计算

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-24 DOI: 10.1140/epjp/s13360-026-08192-5

Ahmed Amine Aidouni, Mounir Ould-Mohamed, Farouk Boutaiba

{"title":"Thermoelectric properties of the two-dimensional Al(_2)Si(_2)S(_2) monolayer from first-principles calculations","authors":"Ahmed Amine Aidouni, Mounir Ould-Mohamed, Farouk Boutaiba","doi":"10.1140/epjp/s13360-026-08192-5","DOIUrl":"10.1140/epjp/s13360-026-08192-5","url":null,"abstract":"<div><p>Two-dimensional thermoelectric materials continue to attract broad research interest, driven by their potential for nanoscale energy conversion. Here, we report a first-principles investigation of the Al<span>(_2)</span>Si<span>(_2)</span>S<span>(_2)</span> monolayer, combining density functional theory with Boltzmann transport calculations. Phonon dispersion curves and elastic constant analysis confirm dynamical and mechanical stability. The electronic structure exhibits an indirect band gap of 0.76 eV at the PBEsol level, rising to 1.45 eV upon hybrid functional correction. Lattice thermal conductivity decreases from 9.719 W m<span>(^{-1})</span>K<span>(^{-1})</span> at 300 K to 4.190 W m<span>(^{-1})</span>K<span>(^{-1})</span> at 700 K, reflecting enhanced phonon–phonon scattering at elevated temperatures. The <i>n</i>-type figure of merit ZT reaches 1.07 at 300 K and increases to 2.06 and 2.98 at 500 and 700 K, respectively, exceeding the unity benchmark at room temperature and approaching 3 at 700 K. The <i>p</i>-type ZT remains below 0.35 across the same range. The superior <i>n</i>-type performance is attributed to a high power factor combined with low electronic thermal conductivity. These results establish the Al<span>(_2)</span>Si<span>(_2)</span>S<span>(_2)</span> monolayer as a strong <i>n</i>-type thermoelectric material with practical potential at both ambient and elevated temperatures.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837643","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

Synchronization dynamics in memristive synapse-coupled homogeneous Wilson circuit 忆阻突触耦合均匀Wilson电路的同步动力学

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-24 DOI: 10.1140/epjp/s13360-026-08193-4

Miaoru Wang, Chengtao Feng, Huagan Wu, Ning Wang, Mo Chen, Quan Xu

{"title":"Synchronization dynamics in memristive synapse-coupled homogeneous Wilson circuit","authors":"Miaoru Wang, Chengtao Feng, Huagan Wu, Ning Wang, Mo Chen, Quan Xu","doi":"10.1140/epjp/s13360-026-08193-4","DOIUrl":"10.1140/epjp/s13360-026-08193-4","url":null,"abstract":"<div><p>Synchronization dynamics plays an important role in neural information transmission. This paper constructs a memristive synapse-coupled homogeneous (MSCH) Wilson circuit and investigates its synchronization dynamics under different external stimuli and coupling strengths. Numerical results show that the MSCH Wilson circuit predominantly exhibits periodic bursting behavior for low-frequency stimuli, whereas periodic, quasi-periodic, and chaotic spiking behaviors for high-frequency stimuli. As the memristive coupling strength increases, the completely synchronized regions shrink, and the MSCH Wilson circuits evolve from synchronous or lag synchronous to asynchronous behavior, indicating that the memristive coupler may destabilize synchronization. Furthermore, STM32-based digital circuit experiments validate the numerically simulated dynamical analysis. These results reveal how memristive synaptic coupling regulates neuronal firing patterns and synchronization states, contributing to a deeper understanding of information transmission in biological neurons.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837905","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

Correction: Design and commissioning of the miniBELEN neutron counter for the study of ((alpha ,n)) reactions 修正：用于研究（(alpha ,n)）反应的miniBELEN中子计数器的设计和调试

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-24 DOI: 10.1140/epjp/s13360-026-07957-2

Nil Mont-Geli, Ariel Tarifeño-Saldivia, Max Pallàs, Ángel Perea, Luis Mario Fraile, Guillem Cortés, Sílvia Viñals, José Luis Tain, Gastón Garcia, Daniel Soler, Odette Alonso-Sañudo, María José G. Borge, José Antonio Briz, Francisco Calviño, Daniel Cano-Ott, Alfredo De Blas, Begoña Fernández, Roger Garcia, Vicente Garcia Tavora, Enrique M. González-Romero, Carlos Guerrero, Andrés Illana, Trino Martínez, Víctor Martínez-Nouvilas, Emilio Mendoza, Enrique Nácher, Amanda Nerio Aguirre, Alberto Pérez de Rada, Julio Plaza, Olof Tengblad, José Manuel Udías

引用次数: 0

A hyperchaotic encryption scheme based on an improved Feistel map and DNA cryptography 基于改进的Feistel映射和DNA密码的超混沌加密方案

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-24 DOI: 10.1140/epjp/s13360-026-08191-6

Lingmei Li

引用次数: 0

Mixed velocity and thermal boundary effects on the onset of LTNE anisotropic Darcy–Bénard convection 混合速度和热边界对LTNE各向异性darcy - badjard对流开始的影响

IF 2.9 3区物理与天体物理

The European Physical Journal Plus Pub Date : 2026-08-24 DOI: 10.1140/epjp/s13360-026-08112-7

A. L. Mamatha, M. Ravisha, I. S. Shivakumara

{"title":"Mixed velocity and thermal boundary effects on the onset of LTNE anisotropic Darcy–Bénard convection","authors":"A. L. Mamatha, M. Ravisha, I. S. Shivakumara","doi":"10.1140/epjp/s13360-026-08112-7","DOIUrl":"10.1140/epjp/s13360-026-08112-7","url":null,"abstract":"<div><p>This study investigates the interplay of mixed velocity and thermal boundary conditions on the onset of local thermal non-equilibrium (LTNE) Darcy–Bénard convection in an anisotropic porous layer. Four distinct combinations of boundary permeability-impermeable/impermeable, porous/porous, porous/impermeable, and impermeable/porous are considered, with a constant heat flux lower surface and an isothermal upper surface. Anisotropies in permeability and thermal conductivities of the fluid and solid phases are incorporated, assuming horizontal isotropy. Linear stability of the steady basic state is examined using a normal-mode analysis of the governing perturbation equations. It is established that the principle of exchange of stabilities holds for all the velocity boundary conditions examined, and the corresponding eigenvalue problem is solved numerically by the shooting method. The system is most stable for impermeable–impermeable boundaries and least stable for porous–porous boundaries, with mixed configurations showing intermediate behavior. Increased mechanical anisotropy and reduced thermal anisotropy, interphase heat transfer, and porosity-modified conductivity ratios destabilize the flow, while a lower isoflux–upper isothermal configuration requires a smaller temperature difference to trigger convection compared to the isothermal–isothermal case.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"141 8","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837907","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