Physica Scripta最新文献_第3页

Thermally stable photosensing using poly(methyl methacrylate)-coated MoS2 phototransistor for improved imaging reliability 使用聚（甲基丙烯酸甲酯）涂层 MoS2 光电晶体管进行热稳定光感应，提高成像可靠性

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6cc8

Jaewan Park, Sungmin Park, Seongin Hong

引用次数: 0

Novel stochastic embedded solitons with quadratic nonlinear susceptibility in the presence of multiplicative noise 存在乘法噪声时具有二次非线性易感性的新型随机嵌入孤子

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6940

E. Zayed, Basel M M Saad, A. Arnous, Y. Yıldırım

引用次数: 0

Synthesis and investigation of polyvinylpyrrolidone-polymer content on magnetic and electromagnetic properties of electrospun BiFeO3, SrFe12O19, α-Fe2O3 nanostructures 聚乙烯吡咯烷酮聚合物含量对电纺丝 BiFeO3、SrFe12O19 和 αFe2O3 纳米结构的磁性和电磁特性的合成与研究

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6d14

Vahid Salehi Maghaddam, A. Gholizadeh

{"title":"Synthesis and investigation of polyvinylpyrrolidone-polymer content on magnetic and electromagnetic properties of electrospun BiFeO3, SrFe12O19, α-Fe2O3 nanostructures","authors":"Vahid Salehi Maghaddam, A. Gholizadeh","doi":"10.1088/1402-4896/ad6d14","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d14","url":null,"abstract":"\u0000 A one-pot electrospinning technique was employed to synthesize polyvinylpyrrolidone (PVP)-based nanofibers containing bismuth ferrite (BiFeO3), strontium hexaferrite (SrFe12O19), and hematite (α-Fe2O3). The influence of PVP polymer concentration on structural properties revealed the formation of pure phases in all samples, except for BiFeO3 nanofibers, which contained an impurity Bi2Fe4O9 phase. Field-emission scanning electron microscope images showed that higher PVP concentrations resulted in longer, thicker nanofiber chains for all samples. Vibrating sample magnetometer analysis indicated that SrFe12O19 nanofibers exhibited strong ferrimagnetic properties with high saturation magnetization (60 emu/g) and coercivity (5000 Oe), while the other samples displayed weaker magnetic properties. To address the fragility of nanofibers produced via the one-pot method, the highest PVP concentration nanofibers were incorporated into low and high concentrations of paraffin matrices. Electromagnetic testing showed that paraffin concentration significantly increased the real part of electrical permittivity for BiFeO3 nanofibers (from ~2 to ~4.5) compared to other compositions (~2 to ~3). Impedance results revealed that BiFeO3 nanofibers had the lowest resistance and likely higher reflectivity. Lastly, the real permittivity of nanofibers decreased with increasing frequency, aligning with Koop's dielectric relaxation theory.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"25 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141925755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Four-wheel steering vehicle trajectory tracking control based on PSO optimized MPC 基于 PSO 优化 MPC 的四轮转向车轨迹跟踪控制

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6d16

ShaoHua Li, Zekun Yang, Baolu Li

{"title":"Four-wheel steering vehicle trajectory tracking control based on PSO optimized MPC","authors":"ShaoHua Li, Zekun Yang, Baolu Li","doi":"10.1088/1402-4896/ad6d16","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d16","url":null,"abstract":"\u0000 In order to address the diﬃculty induced by controller parameter uncertainty in trajectory tracking control of four-wheel steering vehicles(4WS), a trajectory tracking control method for unmanned vehicles based on particle swarm optimization (PSO) is proposed to improve the robustness of the controller. The approach involves the use of model predictive control (MPC) for implementing trajectory tracking control for the unmanned vehicle. Iterative optimization is conducted by utilizing the integral time absolute error (ITAE) as the objective function, which involves multiplying the time integral of lateral deviation and yaw rate deviation. This process ultimately determines the optimized MPC weight matrix parameters. Co-simulation using CarSim/Simulink reveals a remarkable reduction of 46.1% in the maximum longitudinal error, and the optimization proves eﬀective across various vehicle speed conditions. Experimental results validate the eﬀectiveness of the proposed control strategy, with the 4WS control strategy yielding a maximum longitudinal error of 0.28 meters, aﬃrming that the overall controller design successfully accomplishes its intended objectives.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"24 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141926201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of InP/ZnS quantum dots aggregation on the kinetics of birefringence recorded in thin azopolymer composite films InP/ZnS 量子点聚集对偶氮聚合物复合薄膜中记录的双折射动力学的影响

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6d09

A. Stoilova, D. Dimov, Y. Trifonova, G. Mateev, V. V. Lilova, D. Nazarova, L. Nedelchev

引用次数: 0

A perfect absorber based on a VO2-tunable Fabry-Perot cavity: An analysis of periodic oscillation absorption characteristics 基于 VO2 可调谐法布里-珀罗腔的完美吸收器：周期性振荡吸收特性分析

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6d0c

Yanpeng Zhang, Xuehong Sun, Liping Liu, Guoche Qin, Haibo Yu, Zhanxiong Li

{"title":"A perfect absorber based on a VO2-tunable Fabry-Perot cavity: An analysis of periodic oscillation absorption characteristics","authors":"Yanpeng Zhang, Xuehong Sun, Liping Liu, Guoche Qin, Haibo Yu, Zhanxiong Li","doi":"10.1088/1402-4896/ad6d0c","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d0c","url":null,"abstract":"\u0000 Terahertz metamaterial absorbers (TMAs) have garnered significant attention as vital electromagnetic wave-absorbing devices. In this study, we designed a terahertz metamaterial absorber (TMA) utilizing an asymmetric Fabry-Perot nanocavity comprising vanadium dioxide (VO2), gold (Au), and polyimide. The TMA exhibits five perfect absorption peaks within 0.1 THz to 10 THz, with an absorption rate exceeding 97%, peaking at 99%. The absorption rate oscillates periodically between 0 and 1, and its oscillating absorption peak can be determined by fm(fm = (2m + 1)c0/(4t√ε2), while tunability of the absorption rate between 15% and 97% is achievable by adjusting the conductivity of (VO2) (2 × 102 ∼2 × 105 S/m). The physical mechanism of the absorption peak was analyzed by simulation and compared with theoretical analysis. The results show that the absorption peak of the absorber's absorptivity can be insensitive to polarization and has a wide absorption angle of 80% up to 40° or more. Importantly, the thickness of the absorber (VO2) layer can be calculated from the desired absorption frequency and dielectric constant of the interlayer medium,d=√(ε0 /µ0) /σ , thus reducing the need for redesigning different resonant layer patterns. This work provides a new perspective on terahertz absorber design.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"16 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Band structure for relativistic charged particles immersed in a structurally chiral electromagnetic ﬁeld 浸没在结构手性电磁场中的相对论带电粒子的带状结构

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6d15

Abraham Lima, J. A. Reyes

引用次数: 0

Design and Control of Topological Fano Resonance in Kane-Mele Nanoribbons for Sensing Applications 设计和控制 Kane-Mele 纳米带中的拓扑法诺共振以实现传感应用

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6d0b

S. Jalilvand, M. Soltani, Z. Noorinejad, M. Amini, E. Ghanbari-Adivi

{"title":"Design and Control of Topological Fano Resonance in Kane-Mele Nanoribbons for Sensing Applications","authors":"S. Jalilvand, M. Soltani, Z. Noorinejad, M. Amini, E. Ghanbari-Adivi","doi":"10.1088/1402-4896/ad6d0b","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6d0b","url":null,"abstract":"\u0000 The concept of topological Fano resonance, characterized by an ultrasharp asymmetric line shape, is a promising candidate for robust sensing applications due to its sensitivity to external parameters and immunity to structural disorder. In this study, the vacancy-induced topological Fano resonance in a nanoribbon made up of a hexagonal lattice with armchair sides is examined by introducing several on-site vacancies, which are deliberately created at regular distances, along a zigzag chain that stretches across the width of the ribbon. The presence of the on-site vacancies can create localized energy states within the electronic band structure, leading to the formation of an impurity band, which can result in Fano resonance phenomena by forming a conductivity channel between the edge modes on both armchair sides of the ribbon. Consequently, an ultracompact tunable on-chip integrated topological Fano resonance derived from the graphene-based nanomechanical phononic crystals is proposed. The Fano resonance arises from the interference between topologically protected even and odd edge modes at the interface between trivial and nontrivial insulators in a nanoribbon structure governed by the Kane-Mele model describing the quantum spin Hall e®ect in hexagonal lattices. The simulation of the topological Fano resonance is performed analytically using the Lippmann-Schwinger scattering formulation. One of the advantages of the present study is that the related calculations are carried out analytically, and in addition to the simplicity and directness, it reproduces the results obtained from the Landauer-BÄuttiker formulation very well both quantitatively and qualitatively. The ¯ndings open up possibilities for the design of highly sensitive and accurate robust sensors for detecting extremely tiny forces, masses, and spatial positions.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"50 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of interface states and investigation of possible current conduction mechanisms in the Pt, Au, Cu/n-InP Schottky diodes 铂、金、铜/n-InP 肖特基二极管中界面状态的特征和可能的电流传导机制研究

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6d1d

Hogyoung Kim

引用次数: 0

Efficiency Enhancement and Optimization of Lead-free Cs2PtI6 Perovskite Solar Cell 无铅 Cs2PtI6 包晶石太阳能电池的效率提升与优化

Physica Scripta Pub Date : 2024-08-08 DOI: 10.1088/1402-4896/ad6d1c

Anupam Srivastava, A. V. Ullas, Nirmal Roy

引用次数: 0