物理最新文献

{"title":"Light scattering of an arbitrarily oriented cubic particle within the Wentzel–Kramers–Brillouin approach","authors":"E. M. Tari,&nbsp;S. Zahraoui,&nbsp;M. Ibnchaikh,&nbsp;N. Hachem","doi":"10.1140/epjd/s10053-024-00919-2","DOIUrl":"10.1140/epjd/s10053-024-00919-2","url":null,"abstract":"<p>The Wentzel–Kramers–Brillouin approximation is applied to study the light scattering properties of an arbitrarily oriented cubic particle. The form factor and extinction coefficient of this particle are expressed in simple analytical expressions. The effects of certain physical parameters, namely angles of incidence, scattering azimuthal and zenith angles, refractive index and size parameter, on the form factor and extinction coefficient are analyzed. Some numerical examples are also presented to illustrate the results.</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Annealing temperature induced variation on the electrical and photoelectrical characteristics of Al/Feq3/p-Si/Al heterojunction diode","authors":"I. T. Zedan,&nbsp;L. M. El-Khalawany,&nbsp;E. M. El-Menyawy","doi":"10.1007/s00339-024-07910-z","DOIUrl":"10.1007/s00339-024-07910-z","url":null,"abstract":"<div><p>Iron tris(8-hydroxyquinoline) (Feq₃) is thermally stable up to 310 °C. Feq₃ thin films are used to fabricate Al/Feq₃/p-Si/Al heterojunction diode. Based on the thermal properties, the device is annealed at 210 and 280 °C. In order to understand the diode behavior, as-deposited and annealed films are characterized by X-ray diffraction, transmission electron microscope and spectrophotometric measurements of transmittance. Annealing is found to influence the optical band gap of the films. The current–voltage (<i>I</i>–<i>V</i>) characteristics were measured for as-fabricated and annealed temperatures in dark and under illumination. The dark electrical parameters of diode are investigated, from which the ideality factor (<i>n</i>), potential barrier height (<i>ϕ</i>) and series resistance (<i>R</i>_<i>s</i>) of the as-fabricated and annealed Al/Feq₃/p-Si/Al heterojunction are determined. These diode parameters are estimated and discussed in terms of both conventional <i>I</i>–<i>V</i> characteristics and Cheung–Cheung functions. The diode under illumination is found to be influenced by annealing and is found to have photoconduction characteristics in which the photoresponsivity (at − 1 <i>V</i>) of as-fabricated and annealed diode at 280 °C are estimated as 2.77 × 10^–4 and 2.55 × 10^–3 A/W, respectively.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regge trajectories for the triply heavy bottom-charm baryons in the diquark picture","authors":"Jia-Qi Xie,&nbsp;He Song,&nbsp;Jiao-Kai Chen","doi":"10.1140/epjc/s10052-024-13438-6","DOIUrl":"10.1140/epjc/s10052-024-13438-6","url":null,"abstract":"<div><p>We present the explicit form of the Regge trajectory relations for the triply heavy bottom-charm baryons, which can be applied to investigate both the <span>(lambda )</span>-mode excited states and the <span>(rho )</span>-mode excited states. We estimate the masses of the <span>(lambda )</span>-excited states and the <span>(rho )</span>-excited states. The results are in agreement with other theoretical predictions. Both the <span>(lambda )</span>-trajectories and the <span>(rho )</span>-trajectories are discussed. Moreover, the behaviors of the <span>(lambda )</span>- and <span>(rho )</span>-trajectories for various baryons are discussed. It is shown that both the <span>(lambda )</span>-trajectories and the <span>(rho )</span>-trajectories for baryons are concave downwards in the <span>((M^2,,x))</span> plane. The Regge trajectories for the light baryons are approximately linear and become concave as the masses of the light constituents are considered.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13438-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Dual-band unidirectional reflectionlessness based on electromagnetically induced transparency-like in three-cavity array","authors":"Gang Li,&nbsp;Ying Qiao Zhang,&nbsp;Xing Ri Jin","doi":"10.1140/epjp/s13360-024-05677-z","DOIUrl":"10.1140/epjp/s13360-024-05677-z","url":null,"abstract":"<div><p>We propose a scheme to realize the dual-band unidirectional reflectionlessness at an exceptional point in a non-Hermitian system based on electromagnetically induced transparency-like effect. This system is constructed with three plasmonic cavities side-coupled to a plasmonic waveguide. Furthermore, our study verifies that the proposed system can consistently realize dual-band unidirectional reflectionlessness in a wide range of phase shifts, coupling strengths, and loss rates. At the same time, the analysis results show that the position of the reflectionless peaks is robust to loss rates, and can be adjusted by tuning the coupling strength between the plasmonic cavities and the plasmonic waveguide, as well as the coupling strength within the double-cavity array.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411347","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}

{"title":"Synthesis and optical properties of SnO2 nanostructure as a novel photosensitizer for deep tumor treatment in photodynamic therapy using UV light and X-ray radiation","authors":"M. Sharifi,&nbsp;E. Sadeghi,&nbsp;M. Zahedifar","doi":"10.1007/s00339-024-07944-3","DOIUrl":"10.1007/s00339-024-07944-3","url":null,"abstract":"<div><p>Tin oxide (SnO₂) nanoparticles doped with europium impurities were synthesized, and their ability to generate singlet oxygen and hydroxyl radicals was investigated for photodynamic therapy. They were detected using Anthracene and methylene blue reagentsThe process involved chemical synthesis of nanoparticles, followed by analysis of their structural properties and characteristics using X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), and Fourier transform Infrared spectroscopy (FTIR). Additionally, the nanoparticles’ optical properties were studied using Photoluminescence spectroscopy (PL) for potential tumor applications. The analysis of the results shows that the prepared nanoparticles have a tetragonal structure, with a size of 14 nm. Additionally, when excited at a wavelength of 275 nm, they exhibit emission peaks at 388, 412, 481, 667, and 735 nm. Nanoparticles not only have the appropriate photoluminescence spectrum needed for photodynamic therapy, but they also exhibit a strong afterglow. These nanoparticles can serve as an effective light source for treating deep tumors. To achieve this, the nanoparticles are stimulated outside the body and then used as a light source. In this study, UV and X-rays were employed to stimulate the nanoparticles and investigate their photodynamic therapy properties. The findings suggest that SnO₂: Eu nanoparticles show promise as a novel and cost-effective treatment for deep tumor photodynamic therapy.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>The mechanism of photodynamic therapy using SnO₂ nanoparticles with two different light sources for cancer treatment</p></div></div></figure></div></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Jeans analysis in fractional gravity","authors":"Kamel Ourabah","doi":"10.1140/epjc/s10052-024-13443-9","DOIUrl":"10.1140/epjc/s10052-024-13443-9","url":null,"abstract":"<div><p>It has recently been demonstrated (Giusti in Phys Rev D 101:124029, 2020, https://doi.org/10.1103/PhysRevD.101.124029) that characteristic traits of Milgrom’s modified Newtonian dynamics (MOND) can be replicated from an entirely distinct framework: a fractional variant of Newtonian mechanics. To further assess its validity, this proposal needs to be tested in relevant astrophysical scenarios. Here, we investigate its implications on Jeans gravitational instability and related phenomena. We examine scenarios involving classical matter confined by gravity and extend our analysis to the quantum domain, through a Schrödinger–Newton approach. We also derive a generalized Lane–Emden equation associated with fractional gravity. Through comparisons between the derived stability criteria and the observed stability of Bok globules, we establish constraints on the theory’s parameters to align with observational data.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13443-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Crystallisation of liquid silica under compression: a molecular dynamics simulation","authors":"Van Hong Nguyen,&nbsp;Hoang Anh Nguyen","doi":"10.1007/s12043-024-02839-7","DOIUrl":"10.1007/s12043-024-02839-7","url":null,"abstract":"<div><p>In this study, we employ molecular dynamics simulations to develop a large model (19,998 atoms) of liquid SiO₂ at 3500 K. We construct models at different pressures in the 0–100 GPa range using the Beest–Kramer–Santen (BKS) potential and periodic boundary conditions. The goal is to detail the structural transition from the polyamorphic liquid state of SiO₂ to the crystalline stishovite form, which occurs between 45 and 60 GPa. We analyse the polyamorphic state of liquid SiO₂ by examining the formation of SiO_<i>x</i> clusters from 2 to 60 GPa. Beyond 60 GPa, the pair radial distribution functions (PRDFs) for Si–O, O–O and Si–Si display multiple peaks, indicating the crystalline phase. This observation is further supported by examining the bond angle distribution, the fraction of SiO_<i>x</i> units and OSi_<i>x</i> linkages, Si–O bond lengths within SiO_<i>x</i> units, structural visualisations and the analysis of ring statistics in the liquid SiO₂ system, all of which underscore the comprehensive changes in the structure of the system.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Parton distribution functions and fragmentation functions of spin-1 hadrons","authors":"S. Kumano","doi":"10.1140/epja/s10050-024-01411-6","DOIUrl":"10.1140/epja/s10050-024-01411-6","url":null,"abstract":"<div><p>Structure functions of the spin-1 deuteron will be investigated experimentally from the late 2020’s at various facilities such as Thomas Jefferson National Accelerator Facility, Fermi National Accelerator Laboratory, nuclotron-based ion collider facility, and electron-ion colliders. We expect that a new high-energy spin-physics field could be created by these projects. In this paper, the current theoretical status is explained for the structure functions of spin-1 hadrons, especially on parton distribution functions, transverse-momentum dependent parton distributions, and fragmentation functions. Related multiparton distribution functions are also shown.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411241","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}

{"title":"Heterogeneous hypergraph representation learning for link prediction","authors":"Zijuan Zhao,&nbsp;Kai Yang,&nbsp;Jinli Guo","doi":"10.1140/epjb/s10051-024-00791-4","DOIUrl":"10.1140/epjb/s10051-024-00791-4","url":null,"abstract":"<p>Heterogeneous graph representation learning gains popularity due to its powerful capabilities of feature extraction and numerous related algorithms have emerged for various downstream tasks in graph structural datasets. However, the interactions among nodes for the heterogeneous graphs in the real world often extend beyond individual pairs, excessive attention is payed on isolated pairwise connections. In this paper, we propose a novel framework of Heterogeneous Hypergraph Representation Learning method (HHRL) to capture high-order interactions for learning effective node representations of heterogeneous graphs. The method firstly organizes the heterogeneous connections as different hypergraphs. By modeling the heterogeneous connections, HHRL captures the rich structural and semantic information present in the graphs. Then, the graph neural network (GNN) is applied for each hypergraph to capture the interdependencies between nodes and their associated features. By utilizing GNN, HHRL can effectively learn expressive node representations that encode both the structural and feature information of the network. Finally, we concatenate the vectors from different hypergraphs to obtain the link representations. The experiments are conducted on five real dataset for link prediction and the results demonstrate the well performance of the proposed framework comparing to the existing baselines</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Higher order constraints for the ((beta )-deformed) Hermitian matrix models","authors":"Rui Wang","doi":"10.1140/epjc/s10052-024-13377-2","DOIUrl":"10.1140/epjc/s10052-024-13377-2","url":null,"abstract":"<div><p>We construct the (<span>(beta )</span>-deformed) higher order total derivative operators and analyze their remarkable properties. In terms of these operators, we derive the higher order constraints for the (<span>(beta )</span>-deformed) Hermitian matrix models. We prove that these (<span>(beta )</span>-deformed) higher order constraints are reducible to the Virasoro constraints. Meanwhile, the Itoyama–Matsuo conjecture for the constraints of the Hermitian matrix model is proved. We also find that through rescaling variable transformations, two sets of the constraint operators become the <i>W</i>-operators of <i>W</i>-representations for the (<span>(beta )</span>-deformed) partition function hierarchies in the literature.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13377-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}