Results in Physics最新文献

英文中文

Multilayer broadband metamaterial for microwave absorption based on resistive frequency selective surfaces

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-13 DOI: 10.1016/j.rinp.2025.108261

Dongsheng Zhang , Yanfei Chen , Qian Zhou

Achieving broadband electromagnetic wave absorption utilizating the multilayer Frequency Selective Surfaces (FSS) constitutes an effective strategy for designing ultra-thin electromagnetic protection devices. In this study, we propose a thin, broadband, and polarization-insensitive multilayer absorber. The structure encompasses two layers of FSS, a layer of polymethacrylimide (PMI) foam substrate, two additional dielectric layers of quartz glass, and a metallic ground plane. By synergistically optimizing the material parameters and the geometric configuration of the metasurface, the resultant metamaterial demonstrates absorption rates exceeding 90 % within the frequency range of 3.1–18 GHz, which spans the entire C, X, and Ku bands. Experimental results corroborate the exceptional absorption performance of the material, exhibiting good agreement with simulation outcomes. Notably, the absorber exhibits remarkable stability under oblique incidence, maintaining absorption rates above 80 % for both TE and TM polarized waves across incident angles ranging from 0° to 45° within the aforementioned frequency range. A comprehensive analysis of the polarization-insensitive broadband absorption mechanism is conducted, offering pivotal insights for the design of ultra-thin electromagnetic protection devices.

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引用次数: 0

The weak equivalence principle and the Dirac constant: A result from the holographic principle

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-12 DOI: 10.1016/j.rinp.2025.108244

Eiji Konishi

In this article, based on a recent formularization of the holographic principle proposed and investigated by the present author, we show that the weak equivalence principle in general relativity is equivalent to the equivalence between two forms of the Dirac constant, that is, the action of the spin degree of freedom in the two-dimensional Hilbert space and the lower bound in the quantum mechanical uncertainty relations. This result follows from an equation between the Euclidean and Lorentzian world-line actions of a massive particle divided by the Dirac constant, via the Wick rotation, by using the Euclidean and Lorentzian actions of a holographic tensor network, whose quantum state is classicalized by introducing the superselection rule.

引用次数: 0

Bell–Mermin–Klyshko inequalities and one-way information deficit of Dirac fields in noninertial frames

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-11 DOI: 10.1016/j.rinp.2025.108246

Biao-Liang Ye , Yao-Kun Wang , Shao-Ming Fei

We investigate the Bell–Mermin–Klyshko inequalities and the one-way information deficit of Dirac fields in noninertial frames, where the quantum correlations are shared between inertial and accelerated observers due to the Unruh effect. We derive partial analytical results for specific quantum states using the one-way information deficit. Additionally, we present numerical results for the Bell–Mermin–Klyshko inequalities. The study reveals the presence of Bell nonlocality and the significance of the one-way information deficit in relativistic quantum information.

我们研究了非惯性框架中的贝尔-梅明-克雷什科不等式和狄拉克场的单向信息赤字，在非惯性框架中，惯性观察者和加速观察者之间由于乌鲁赫效应而共享量子相关性。我们利用单向信息不足推导出特定量子态的部分分析结果。此外，我们还给出了贝尔-梅明-克雷什科不等式的数值结果。这项研究揭示了贝尔非局域性的存在以及单向信息赤字在相对论量子信息中的重要性。

引用次数: 0

Polydisperse stickiness and particle size on light scattering in dense colloidal suspensions: A numerical study using the binary sticky hard-sphere model

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-10 DOI: 10.1016/j.rinp.2025.108247

Hiroyuki Fujii , Koyata Nishikawa, Hyeonwoo Na, Kazumichi Kobayashi, Masao Watanabe

In nanotechnology using scattered light and colloidal science, it is crucial to model the agglomeration of submicrometer-scale particles and light scattering in dense colloidal suspensions and clarify the quantitative relation between them. We numerically examined the effects of polydisperse stickiness and particle sizes on the scattering properties in the near-infrared optical wavelength using the dependent scattering theory (one of the electromagnetic theory) and bidisperse (binary) sticky hard-sphere (SHS) model at different stickiness parameters and particle sizes. The SHS model has been widely employed as a particle interaction model, but most previous works are for a monodisperse system. Actual suspensions are polydisperse, and our simple bidisperse models allow us to provide a physical interpretation of the two polydisperse effects. We showed that polydisperse stickiness contributions are effectively reduced to monodisperse cases with a mean value of the stickiness parameters. Meanwhile, we showed strong effects of the polydisperse particle size, and its contribution is not reduced to a monodisperse case. At a small particle size (around 100 nm), the polydispersity effects enhance the scattering properties even in the diffusive region of radiative transfer.

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引用次数: 0

On the bosonic origin of the elastic constants of the solids

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-09 DOI: 10.1016/j.rinp.2025.108250

Ulrich Köbler

It is shown that the elastic compliances, s_ij, are defined, as the elastic stiffness constants, c_ij, by bosons. The constants c_ij are well-known to be given by the velocities of the sound waves, called here Debye-bosons. Sound waves are evidently elastic dipole radiation. The constants s_ij will be shown to originate in a boson type that is identified as elastic quadrupole radiation. Consistent with the conclusion that the two elastic constants are defined by bosons is that they reach a (finite) maximum at the ordering temperature of the respective boson field. The maximum of the elastic compliances s_ij at T_m indicates, that the associated bosons order at the melting point, T_m. We will call these bosons, MP-bosons. The maximum of the constants c_ij is at T = 0. As a consequence, the Debye boson field does not order at a finite temperature. Upon ordering, all MP-bosons condense in one energy state (Bose-Einstein condensation). This is the thermodynamically highest possible order. Additionally, ordered boson fields constrict themselves to the finite volume of a stationary unit. In magnetism, these ordered units are known as domains. The mosaic blocks are identified as the long-range ordered units, created upon ordering of the MP-bosons. Moreover, ordered boson fields attempt to assume the smallest possible volume (magnetostriction). The self-constriction of the ordered MP-boson field that compresses each mosaic block, has to be made responsible for the strong decrease of the lattice parameter below T_m and for the cohesion of the solids up to T_m.

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引用次数: 0

Theoretical investigation of plasmonic properties of gold-silver alloys for SPR biosensing applications

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-08 DOI: 10.1016/j.rinp.2025.108252

Innocent Kadaleka Phiri , Mohssin Zekriti

Surface Plasmon Resonance (SPR) arises from the light-induced excitation of free electrons near a metal surface, making it a key mechanism in biosensing applications. While gold and silver are the commonly used metals, gold-silver (Au-Ag) alloys have gained interest in SPR. However, the impact of different gold-to-silver composition ratios on SPR performance remains underexplored, complicating alloy selection for applications such as SPR biosensors. This study theoretically investigates the influence of Au-Ag alloy compositions on the Surface Plasmon Polariton (SPP) wave characteristics and SPR biosensor performance using the Transfer Matrix Method (TMM) and the Kretschmann configuration. Our findings suggest that specific alloy compositions can enhance sensitivity and propagation length, making them promising for high-performance biosensing applications. A proposed biosensor design incorporating an Au-Ag alloy, a CaF₂ glass prism, Black Phosphorus (BP) layers, and water as the sensing medium is discussed. Additionally, we outline the procedures and potential challenges associated with its practical implementation. This work contributes to advancing high-performance biosensing technologies and aligns with the Sustainable Development Goals (SDGs) 3 and 9 of the United Nations (UN).

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引用次数: 0

Influence of rare earth Sm3+ doping on structural and magnetic properties of Ba2FeMoO6 double perovskite

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-08 DOI: 10.1016/j.rinp.2025.108254

Z. Ghorbani, M.H. Ehsani

The structural and magnetic properties of the Ba_2-xSm_xFeMoO₆ (x = 0.0, 0.15, 0.2) samples synthesized by the sol–gel method have been investigated. Albeit the doped samples were achieved with impurities, Rietveld refinement of X-ray diffraction data revealed that these samples crystallized in cubic structure with Fm-3 m space group. The lattice parameters, unit cell volume, and bond lengths of the samples with doping increased compared to the pristine sample. A mixed valence states was observed for all samples by XPS characterization. A reduction in magnetization (M_S) is observed for doped samples. The transition temperature (T_C) decreased by doping Sm³⁺ ions. The observation of two peaks in the real component of magnetic susceptibility can be ascribed to the existence of Griffiths phases.

研究了采用溶胶-凝胶法合成的 Ba2-xSmxFeMoO6（x = 0.0、0.15、0.2）样品的结构和磁性能。尽管掺杂样品中含有杂质，但对 X 射线衍射数据进行的里特维尔德细化显示，这些样品结晶为立方结构，空间群为 Fm-3 m。与原始样品相比，掺杂样品的晶格参数、单胞体积和键长都有所增加。通过 XPS 表征，所有样品都观察到了混合价态。掺杂样品的磁化率（MS）有所降低。掺杂 Sm3+ 离子后，转变温度（TC）降低。在磁感应强度的实际分量中观察到的两个峰值可归因于格里菲斯相的存在。

引用次数: 0

Quantum oscillations of bloch point in cylindrical ferromagnetic nanowire: Quasiclassical approach

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-08 DOI: 10.1016/j.rinp.2025.108245

A.B. Shevchenko , O.V. Oliinyk , A.V. Minitskyi , M.Yu. Barabash

Quantum oscillations of a Bloch point (BP) in the domain wall of a cylindrical ferromagnetic nanowire are investigated using the quasiclassical approximation. The conditions for these oscillations in an external uniform magnetic field are determined. It is shown that quantum oscillations of BP in the domain walls of nickel and iron nanowires can be observed at temperatures of liquid helium. The evolution of the BP wave packet over time is investigated. The characteristic time of its transformation into beats, which form because of superposition of two wave functions with equal amplitudes and close energies and wave numbers, is determined. The train of this wave provides the transfer of BP energy. The obtained results can find practical application in micro − and nanotechnologies based on the quantum properties of BP.

引用次数: 0

Large-scale molecular dynamics simulations of negative Poisson’s ratio in hydrogenated biphenylene

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-06 DOI: 10.1016/j.rinp.2025.108251

Zhefeng Wang , Kai Chen , Youmin Xu , Zengjie Wang , Chong Qiao , Yuxiang Zheng , Rongjun Zhang , Liangyao Chen , Songyou Wang , Wan-Sheng Su

This study was conducted to investigate the effect of hydrogenation on the Poisson’s ratio of biphenylene. By combining large-scale molecular dynamics simulations with a stochastic structure generation method, this study revealed that the Poisson’s ratio of biphenylene can shift from positive to negative as the degree of hydrogenation is adjusted. Specifically, at lower hydrogenation levels, the Poisson’s ratio decreases with increasing hydrogenation, eventually exhibiting a negative Poisson’s ratio at 40% to 50% hydrogenation. However, as hydrogenation progresses further, the negative Poisson’s ratio effect diminishes. The occurrence of negative Poisson’s ratio in hydrogenated biphenylene is attributed to a pronounced ripple effect induced by hydrogenation. Under tensile strain, the suppression of ripples reduces contraction in the direction perpendicular to the applied stretch. Moreover, the findings highlight a strong correlation between the ripple effects in the structure and the percentage of hydrogenation. These results demonstrate that hydrogenation serves as an effective approach to modulate the Poisson’s ratio of biphenylene, enabling its transition from positive to negative.

本研究旨在探讨氢化对联苯泊松比的影响。通过将大规模分子动力学模拟与随机结构生成方法相结合，本研究发现，随着氢化程度的调整，联苯的泊松比会从正值变为负值。具体来说，在较低的氢化程度下，泊松比会随着氢化程度的增加而降低，最终在氢化程度为 40% 至 50% 时呈现负泊松比。然而，随着氢化程度的进一步提高，负泊松比效应会减弱。氢化联苯出现负泊松比的原因是氢化引起了明显的波纹效应。在拉伸应变下，波纹的抑制减少了垂直于拉伸方向的收缩。此外，研究结果还强调了结构中的波纹效应与氢化百分比之间的密切联系。这些结果表明，氢化是调节联苯泊松比的有效方法，可使其从正值转变为负值。

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引用次数: 0

Non-Fourier heat transfer analysis of sandwich conical shells with GPLs reinforced face sheets and porous core under moving heat flux

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics

Pub Date : 2025-04-05 DOI: 10.1016/j.rinp.2025.108240

Yasin Heydarpour , Parviz Malekzadeh , Hanxing Zhu , Morteza Mohammadzaheri

In this work, as a first attempt, the thermal behavior of nanocomposite sandwich conical shells under internal axisymmetric moving heat flux based on the non-Fourier heat transfer is investigated. In order to capture the influences of the finite heat wave speed, the hyperbolic heat transfer equation is used. The face sheets of the nanocomposite sandwich shell are made of graphene platelets (GPLs) reinforced polymer matrix. The core layer is fabricated from a GPLs reinforced porous composite material. In both core layer and face sheets, GPLs have uniform distribution and random orientation. Through a two-dimensional layerwise approach, the differential quadrature method (DQM) and the nonuniform rational basis spline (NURBS) curves based multi-step technique are employed to discretize the governing equations in the spatial and temporal domains, respectively. The performance of the present method is demonstrated by performing convergence study and comparing the results in the limit cases with those reported in literature. Following the approach validation, parametric studies are carried out to elucidate the influences of heat flux speed, porosity distribution and amounts, GPLs weight fractions and the shell-thickness-to-length ratio on the thermal responses of the sandwich conical shells under investigation. The results show that the speed of moving heat flux and GPLs weight fractions have significant effects on the thermal responses of the shells. But the porosity distribution and amounts have less effect on the thermal behavior of the shell. In addition, the increase of the heat flux speed decreases the traveled distance by the heat wave front and the increase of the weight fraction of GPLs increases the heat wave speed.

在这项工作中，作为首次尝试，基于非傅里叶传热研究了纳米复合材料夹层锥形壳体在内部轴对称移动热通量下的热行为。为了捕捉有限热波速的影响，采用了双曲传热方程。纳米复合材料夹层外壳的面层由石墨烯小板（GPLs）增强聚合物基体制成。芯层由 GPLs 增强多孔复合材料制成。在芯层和面层中，GPLs 具有均匀分布和随机取向的特点。通过二维分层方法，采用微分正交法（DQM）和基于非均匀有理基样条曲线（NURBS）的多步骤技术，分别对空间域和时间域的控制方程进行离散化。通过进行收敛性研究，并将极限情况下的结果与文献报道的结果进行比较，证明了本方法的性能。在方法验证之后，进行了参数研究，以阐明热流速度、孔隙率分布和数量、GPL 重量分数和壳厚长比对所研究的夹层锥形壳热响应的影响。结果表明，热流移动速度和 GPLs 重量分数对壳的热响应有显著影响。但孔隙率分布和数量对壳的热行为影响较小。此外，热流速度的增加会减少热波前沿的移动距离，而 GPL 重量分数的增加则会增加热波速度。

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