Physica Scripta最新文献_第8页

Studies of anisotropic polarization in graphene oxide doped in PVA 掺杂在 PVA 中的氧化石墨烯的各向异性极化研究

Physica Scripta Pub Date : 2024-07-23 DOI: 10.1088/1402-4896/ad6699

Athira A, Chitra Shaji, Neeraj Ramachandran, Alok Sharan

引用次数: 0

Effects of nanocutting environments on the electronic structure of armchair-type graphene nanoribbons: the first-principles study 纳米切割环境对扶手椅型石墨烯纳米带电子结构的影响：第一原理研究

Physica Scripta Pub Date : 2024-07-23 DOI: 10.1088/1402-4896/ad669b

Meiling Tang, Zewei Yuan, Jingting Sun, Yan He, Di Ran, Ying Wang, Yusen Feng, Xinbo Zhou

{"title":"Effects of nanocutting environments on the electronic structure of armchair-type graphene nanoribbons: the first-principles study","authors":"Meiling Tang, Zewei Yuan, Jingting Sun, Yan He, Di Ran, Ying Wang, Yusen Feng, Xinbo Zhou","doi":"10.1088/1402-4896/ad669b","DOIUrl":"https://doi.org/10.1088/1402-4896/ad669b","url":null,"abstract":"\u0000 In order to investigate the effect of nanocutting environment on the electronic structure of armchair-type graphene nanoribbons, this paper adopts a first-principle computational approach to study the effect of different substrates and solutions, such as on the motion of electrons in the middle and outer orbitals of graphene nanoribbons, by observing the energy band structure, the value of the band gap, and the density of the split-wave states. The results show that the adsorption of Si and C atoms at the edge of the nanoribbon leads to a decrease in the band gap value. The adsorption of Al and O atoms at the edges of graphene nanoribbons leads to a decrease in the nanoribbon band gap value to 0 eV. Different substrate atoms mainly affect the p-orbital electron motion in the nanobelt. Bare-edge graphene nanoribbons are indirect bandgap structures, and graphene nanoribbons with H, O and OH atoms adsorbed at the edges of the nanoribbons are direct bandgap structures. Edge O-isation leads to a nanobelt band gap of 0, which exhibits metallic properties. The edge H-isation nanoribbon band gap is higher than the bare edge nanoribbon band gap. Nanoribbon edge OH-isation reduces the nanoribbon band gap value. Nanoribbon edge adsorption of atoms in solution affects p-orbital electron motion. The formation energy of five-ring defects and seven-ring defects is low, and the defects are easier to form. The edges containing defects all reduce the band gap values of graphene nanoribbons. The defects mainly affect the p-orbital electron motion, leading to differences in the band gap values. The bandgap decreases with increasing nanobelt width, and the bandgap value conforms to 3N+2<3N<3N+1, with regular fluctuations in the curve with period 3. The larger the band gap, the smaller the curvature of the curve at the extremes, and the sparser the curve.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"116 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141811919","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

EPR Steering Paradox “2_Q = (2 − δ)_C” EPR 转向悖论 "2_Q = (2 - δ)_C"

Physica Scripta Pub Date : 2024-07-23 DOI: 10.1088/1402-4896/ad669c

Zhi-Jie Liu, Xingran Fan, Jie Zhou, Mi Xie, Jing-Ling Chen

{"title":"EPR Steering Paradox “2_Q = (2 − δ)_C”","authors":"Zhi-Jie Liu, Xingran Fan, Jie Zhou, Mi Xie, Jing-Ling Chen","doi":"10.1088/1402-4896/ad669c","DOIUrl":"https://doi.org/10.1088/1402-4896/ad669c","url":null,"abstract":"\u0000 Einstein-Podolsky-Rosen (EPR) steering is a quantum nonlocality between entanglement and Bell’s nonlocality emphasizing the incompatibility of the local-hidden-state (LHS) model with quantum theory. It is well established that the EPR steering paradox is an essential method for determining steering, which reveals the nature of steering by logical contradiction. However, previous studies on the EPR steering paradox have only examined cases where the conditional states of the steered party are pure. In this work, we present the EPR steering paradox about the case when the conditional states of the steered party are mixed, which can be expressed as a paradoxical equality “2Q = (2 - δ)C” (0 < δ < 1) given by quantum (Q) and classical (C) theories. For any N-qubit state, in the two-setting steering protocol, the contradiction “2Q = (2 - δ)C” can be obtained if and only if a particular set of projective measurements of the steering party makes all the conditional states of the steered party pure, which also implies that the N-qubit state is steerable. Moreover, considering the conditional states of the steered party as mixed states, we are able to identify the full range of steerable states detectable through the EPR steering paradox method. This also means that, so far, one has found all the steerable states that can be recognized by the EPR steering paradox, which is signiﬁcant for some typical quantum schemes such as quantum teleportation and quantum key distribution.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"112 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141812087","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

DLS homemade setup: reviewing first and second-order coherence and autocorrelation concepts of a light source in the context of nanoparticle sizes synthesized by PLAL DLS 自制装置：结合 PLAL 合成的纳米粒子尺寸，回顾光源的一阶和二阶相干性及自相关性概念

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad664e

Javier Meza-Arroyo, Jesús Valdés-Hernández, J. L. Domínguez-Juárez, R. Quintero-Torres

{"title":"DLS homemade setup: reviewing first and second-order coherence and autocorrelation concepts of a light source in the context of nanoparticle sizes synthesized by PLAL","authors":"Javier Meza-Arroyo, Jesús Valdés-Hernández, J. L. Domínguez-Juárez, R. Quintero-Torres","doi":"10.1088/1402-4896/ad664e","DOIUrl":"https://doi.org/10.1088/1402-4896/ad664e","url":null,"abstract":"\u0000 The size of the nanoparticles (NP) is one of the most important and essential characteristics to know the properties of the synthesized nanostructures. The most common characterization procedures are related to Scanning Electronic Microscopy (SEM), Transmission Electronic Microscopy (TEM), and Atomic Force Microscopy (AFM). Unfortunately, from a practical point of view, they represent a time-consuming procedure and require expensive equipment, which limits its application to specialized research groups. Significant attention has been paid to Dynamic Light Scattering (DLS) as a simple, fast, and reproducible method for sizing nanoparticles. However, inadequate representation of the fundamental principles of DLS and data interpretation represents two of the most important challenges related to this technique. In this work we try to provide the fundamental principles of the DLS technique, the fundamental mathematical treatment of data obtained during the optical scattering studies and provide the MATLAB code to configure non-commercial DLS equipment. Additionally, analyzes of nanoparticles obtained by pulsed laser ablation of Ag, Au, Si and W and commercial Au nanoparticles were carried out. The particle size results are compared with SEM images to calculate the percentage error of the DLS measurements. The results show an error of 5%, 3.8%, 2.1% for the Ag, Au and Si nanoparticles respectively, which proves to be an excellent approximation to the real values of nanoparticle diameter. Meanwhile, the error in size for W nanoparticles by the same technique and commercial Au nanoparticle is 29% and 12%, which shows the effect of the hydrodynamic diameter of the nanoparticles. This work ends with the analysis of the concentration of nanoparticles and its importance in reliable results of DLS measurements.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"36 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141815035","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

Analysis of f(R, T) Inflationary Models and Their Response to Planck Data f（R，T）膨胀模型分析及其对普朗克数据的响应

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6650

Anisur Rahaman, S. Aziz

引用次数: 0

Mixed convective magneto flow of nanofluid for the Sutterby fluid containing micro-sized selfpropelled microorganisms with chemical reaction: Keller Box Analysis 纳米流体的混合对流磁流体，用于含有微小自推进微生物的萨特比流体与化学反应：凯勒方框分析

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6642

F. Ali, Mustafa Kamal, Muhammad Faizan Ahmed, S. Zafar

{"title":"Mixed convective magneto flow of nanofluid for the Sutterby fluid containing micro-sized selfpropelled microorganisms with chemical reaction: Keller Box Analysis","authors":"F. Ali, Mustafa Kamal, Muhammad Faizan Ahmed, S. Zafar","doi":"10.1088/1402-4896/ad6642","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6642","url":null,"abstract":"\u0000 The current work aims to scrutinize the bioconvection Sutterby nanofluid flow of the Cattaneo-Christov heat and mass flux over a rotating disk. The effects of thermophoresis and Brownian motion receive considerable consideration. The process of analyzing heat and mass transfer phenomena involves taking into account the impacts of thermal radiation and chemical reactions that are susceptible to convective boundary conditions. Firstly, we reduce the PDEs of the physical model to ODEs through alter transformation and then numerically solved the transformed ODEs using Keller Box technique. An analysis of numerical data follows to ascertain the role of numerous flow variables on the flow profiles. Based on the findings, it is evident that an increase in the fluid variable Δ and the porous variable K leads a decrease in the, radial F'(ζ), axial F(ζ) and tangential G(ζ) velocities. Furthermore, we find that the growing values of the thermal radiation Rd variable and the thermal Biot number B_T greatly aid in raising the fluid's temperature. Concentration profile shows decreasing behavior for rising values of Schmidt number Sc but upsurge for solutal Biot number B_C. The microorganism is decayed with greater Lewis number Lb and Peclet number Pe.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"32 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141815242","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

Fabrication, structural, morphological, and mechanical behaviour of fly ash doped clay ceramics based CO2 gas sensor 基于粉煤灰掺杂粘土陶瓷的二氧化碳气体传感器的制造、结构、形态和机械性能

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6648

Savita Kumari, Rakhi, Ajaz Hussain, Sarvesh Kumar Avinashi, R. K. Mishra, Shweta, Ajeet Singh, Bal Chandra Yadav, C. Gautam

{"title":"Fabrication, structural, morphological, and mechanical behaviour of fly ash doped clay ceramics based CO2 gas sensor","authors":"Savita Kumari, Rakhi, Ajaz Hussain, Sarvesh Kumar Avinashi, R. K. Mishra, Shweta, Ajeet Singh, Bal Chandra Yadav, C. Gautam","doi":"10.1088/1402-4896/ad6648","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6648","url":null,"abstract":"\u0000 Various attempts have been made to fabricate fly ash-doped clay composites via solid state reaction method. Additionally, to investigate the structural, mechanical, surface morphology, and CO2 gas sensing behavior, the fabricated clay composites were sintered at three different temperatures 1000, 1100, and 1200 °C (COF1, COF2, COF3) for 4 h. The green and sintered densities of the fabricated composites were found to be in the range of 2.17-2.13 g/cm3 and 1.38 to 1.30 g/cm3. Further, various characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, universal testing machine (UTM) and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDAX) were carried out. Moreover, to determine the compressive strength and Young’s modulus values, a universal testing machine (UTM) was used. The fracture toughness of the fabricated composites, COF2 and COF3 were found to be 7.84 MPa-m1/2 and 2.22 MPa-m1/2. The COF3 composite exhibited a sensing response, response time, recovery time of 3.39 at 1200 ppm CO2, 16.95 s and 18.05 s respectively. Consequently, this porous clay composite can be fabricated in a cost-effective and eco-friendly manner, hence beneficial for CO2 gas sensing applications.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"19 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141817094","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

Multi-lump, resonant Y-shape soliton, complex multi kink solitons and the solitary wave solutions to the (2+1)-dimensional Boiti-Leon-Manna-Pempinelli equation for incompressible fluid 不可压缩流体 (2+1)-dimensional Boiti-Leonon-Manna-Pempinelli 方程的多肿块、共振 Y 形孤子、复杂多扭结孤子和孤波解

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad664a

Yan-fei He

引用次数: 0

Enhancement of penetration of electromagnetic waves by field focusing applied to GPR detection 通过应用于 GPR 检测的场聚焦增强电磁波的穿透力

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad664d

Qifei Zhang, Linyan Guo, Bo Li, Zi-qiao Zheng

{"title":"Enhancement of penetration of electromagnetic waves by field focusing applied to GPR detection","authors":"Qifei Zhang, Linyan Guo, Bo Li, Zi-qiao Zheng","doi":"10.1088/1402-4896/ad664d","DOIUrl":"https://doi.org/10.1088/1402-4896/ad664d","url":null,"abstract":"\u0000 Ground penetrating radar (GPR) is limited by challenges such as signal attenuation and inadequate target detection in lossy dielectrics, prompting research on data processing algorithms to enhance detection capability. In this study, we propose a method for enhancing GPR detection capability based on electromagnetic field focusing (FF). The method involves calculating the phase difference attributable to the range difference between each antenna element and the focal point and compensating its feed phase accordingly. This approach effectively concentrates the energy of electromagnetic waves at the target area. Tapered slot antennas operating within the 2.5–8 GHz frequency band were employed for transmitting and receiving, thus facilitating algorithm verification and target detection. The synthetic aperture radar algorithm executed pulse compression and range migration on the received data, thereby intensifying the signal at the target object's position and achieving double focusing. Notably, this study uniquely employs FF to enhance the penetrability of electromagnetic waves and augment the detection capability of GPR. Both simulation and experimental results demonstrated the effectiveness of the proposed method in improving the GPR imaging quality.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"42 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141815216","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

Tunable Terahertz filter based on graphene photonic crystals with defective layers 基于带缺陷层石墨烯光子晶体的可调谐太赫兹滤波器

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6643

Songchao Shen, Ahmed M F Hameed, Feifei Qin, Ibrar, Ang Bian, Jun Dai

引用次数: 0