Journal of the Korean Physical Society最新文献_第3页

Quantization in noninertial reference frames and curved spacetime 非惯性参考系和弯曲时空中的量子化

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-03-04 DOI: 10.1007/s40042-025-01311-y

An Yong Li

{"title":"Quantization in noninertial reference frames and curved spacetime","authors":"An Yong Li","doi":"10.1007/s40042-025-01311-y","DOIUrl":"10.1007/s40042-025-01311-y","url":null,"abstract":"<div>In quantum mechanics, the reference frames of the observers are often not explicitly mentioned and quantization for a physical system is usually performed in inertial reference systems. Quantization in noninertial reference systems is an important topic and should be studied systematically. In the framework of nonrelativistic quantum mechanics, the quantum mechanical equations in noninertial reference frames could be derived from those in inertial reference frames using unitary transformation operators. Here, we use canonical quantization scheme to derive quantum mechanics wave equations and Hamiltonian operator in general noninertial coordinate systems in nonrelativistic and relativistic spacetime directly from the classical Hamiltonian formulation based on the basic physical principles. As a special case, the Schrödinger equation in rotating coordinate system of nonrelativistic spacetime, and the KG equation and the first-order wave equation in rotating coordinate systems of Minkowski spacetime were derived from the classical Hamiltonian using canonical quantization scheme. In curved spacetime, the matrix-valued vector field γa in the first-order wave equation determines the spacetime metric gab and spacetime geometry and has great gauge freedom. In the gauge defined by the gauge constraint γb∇bγa = 0, the Dirac equation in curved spacetime is reduced to our first-order wave equation. A Hamiltonian operator in general spacetime is derived from the first-order wave equation, which is Hermitian only in a special class of spacetimes.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 8","pages":"701 - 725"},"PeriodicalIF":0.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840350","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}

引用次数: 0

Modeling of magnetohydrodynamic Casson fluid flow due to moving permeable plate with Soret and Dufour impacts 考虑Soret和Dufour冲击的可渗透板运动磁流体力学卡森流体流动模型

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-03-03 DOI: 10.1007/s40042-025-01301-0

Himanshu Chaudhary, Nidhi Singh, Muhammad Roshan, Pramod Kumar Yadav, Salman Saleem

{"title":"Modeling of magnetohydrodynamic Casson fluid flow due to moving permeable plate with Soret and Dufour impacts","authors":"Himanshu Chaudhary, Nidhi Singh, Muhammad Roshan, Pramod Kumar Yadav, Salman Saleem","doi":"10.1007/s40042-025-01301-0","DOIUrl":"10.1007/s40042-025-01301-0","url":null,"abstract":"<div>This work aims to investigate the magnetohydrodynamic boundary layer flow of Casson fluid due to a moving permeable plate with Soret and Dufour impacts. The mathematical modeling of the current flow problem is obtained by utilizing the mass balance, momentum balance, energy balance, and concentration equations. The flow equations are governed by highly non-linear PDEs, which are converted into ODEs with the help of suitable similarity transformations in order to get simplified versions of the governing equations. The authors have solved these equations with appropriate boundary conditions by employing the BVP4C method in the inbuilt software MATLAB. In this work, we have explored the effect of various prominent parameters such as the Casson fluid parameter, Hartmann number, Soret number, Dufour number, Prandtl number, Forchheimer number, chemical reaction parameter and porosity parameter on the flow quantities such as velocity, temperature, and concentration with the help of graphical plots and tables. After the analysis of results, it is found that as the Casson fluid parameter and Hartmann number increase, the velocity of the Casson fluid decreases, but the concentration and temperature during the Casson fluid flow get enhanced. It is also found from the present work that the fluid temperature and Nusselt number can be controlled by the Dufour number, whereas the concentration and Sherwood number of the fluid can be controlled by the Soret number. Furthermore, it is observed that the temperature and concentration of the Casson fluid decrease steeply for higher values of the Prandtl number. The results of the present work bridge the gap in the body of available literature and may be very useful in lubrication systems with permeable surfaces, flow through porous tissues or membranes, as in dialysis or drug delivery systems, and chemical, pharmaceutical, and food industries, where filtration through permeable plates is needed.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 8","pages":"745 - 768"},"PeriodicalIF":0.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840262","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}

引用次数: 0

Charge transport and thermoelectric properties of Cu3Sb1−xGexSe4−ySy Cu3Sb1−xGexSe4−ySy的电荷输运和热电性质

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-03-03 DOI: 10.1007/s40042-025-01329-2

YuRim Lee, Sang Jun Park, Il-Ho Kim

{"title":"Charge transport and thermoelectric properties of Cu3Sb1−xGexSe4−ySy","authors":"YuRim Lee, Sang Jun Park, Il-Ho Kim","doi":"10.1007/s40042-025-01329-2","DOIUrl":"10.1007/s40042-025-01329-2","url":null,"abstract":"<div>Cu3Sb1−xGexSe4−ySy (0.04 ≤ x ≤ 0.12 and 0.10 ≤ y ≤ 0.25) permingeatite compounds were synthesized via dual doping of Ge and S at the Sb and Se sites, respectively. The structural, charge transport, and thermoelectric properties of these materials were systematically investigated. All samples exhibited high relative densities, ranging from 95.8% to 97.3%, and predominantly consisted of the tetragonal permingeatite phase. However, minor secondary phases, such as Se or Cu8GeS6, were detected depending on the S content. The introduction of Ge and S dopants caused a contraction in the lattice parameters of permingeatite. The electrical conductivity exhibited characteristics of a degenerate semiconductor, either remaining stable or slightly decreasing with increasing temperature. An increase in Ge content enhanced electrical conductivity, whereas an increase in S content reduced it. The Seebeck coefficient exhibited p-type behavior with positive values and decreased with increasing Ge content and decreasing S content. Dual doping with Ge and S significantly improved the power factor, with Cu3Sb0.96Ge0.04Se3.90S0.10 achieving 0.63 mWm−1 K−2 at 623 K. In addition, the power factor showed a positive dependence on temperature, indicating the absence of intrinsic transition within the investigated temperature range. The thermal conductivity exhibited an inverse relationship with temperature, influenced by both the doping concentration and the temperature-dependent electronic and lattice components. Consequently, the thermoelectric performance was significantly enhanced by the dual doping strategy, achieving a maximum ZT of 0.37 at 623 K for both Cu3Sb0.96Ge0.04Se3.90S0.10 and Cu3Sb0.92Ge0.08Se3.90S0.10.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 8","pages":"790 - 799"},"PeriodicalIF":0.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840265","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}

引用次数: 0

Quantifying traffic patterns with percolation theory: a case study of Seoul roads 用渗透理论量化交通模式：以首尔道路为例

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-03-03 DOI: 10.1007/s40042-025-01328-3

Yongsung Kwon, Mi Jin Lee, Seung-Woo Son

{"title":"Quantifying traffic patterns with percolation theory: a case study of Seoul roads","authors":"Yongsung Kwon, Mi Jin Lee, Seung-Woo Son","doi":"10.1007/s40042-025-01328-3","DOIUrl":"10.1007/s40042-025-01328-3","url":null,"abstract":"<div>Urban traffic systems are characterized by dynamic interactions between congestion and free-flow states, influenced by human activity and road topology. This study employs percolation theory to analyze traffic dynamics in Seoul, focusing on the transition point (q_textrm{c}) and Fisher exponent (tau). The transition point (q_textrm{c}) quantifies the robustness of the free-flow clusters, while the exponent (tau) captures the spatial fragmentation of the traffic networks. Our analysis reveals temporal variations in these metrics, with lower (q_textrm{c}) and lower (tau) values generally during rush hours representing low-dimensional behavior, within the broader context of the positive correlation between (q_textrm{c}) and (tau). Weight–weight correlations are found to significantly impact cluster formation, driving the early onset of dominant traffic states. Comparisons with uncorrelated models highlight the role of real-world correlations. This approach provides a comprehensive framework for evaluating traffic resilience and informs strategies to optimize urban transportation systems.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 8","pages":"693 - 700"},"PeriodicalIF":0.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840264","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}

引用次数: 0

Luminescent quenching of carbon dots originated from o-phenylenediamine for Cr3+ detection in wasted water 邻苯二胺碳点发光猝灭用于废水中Cr3+的检测

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-02-27 DOI: 10.1007/s40042-025-01306-9

Woo Tae Hong, Jae Yong Jung, Jin Young Park, Hyun Kyoung Yang

{"title":"Luminescent quenching of carbon dots originated from o-phenylenediamine for Cr3+ detection in wasted water","authors":"Woo Tae Hong, Jae Yong Jung, Jin Young Park, Hyun Kyoung Yang","doi":"10.1007/s40042-025-01306-9","DOIUrl":"10.1007/s40042-025-01306-9","url":null,"abstract":"<div>The detection of heavy-metal ions is necessary owing to their wide and increasing utilization. Fluorometric detection has been suggested for the detection of heavy-metal ions because of its low cost, high detection speed, and high accuracy. This study investigates heavy-metal detection using carbon dots (CDs) derived from o-phenylenediamine. The CDs were synthesized via hydrothermal synthesis and had an average particle size of 2 nm and a hexagonal lattice structure. The existence of chemical bonds between C, N, O, and H was confirmed by analyzing the XPS and FTIR spectra of the CDs. The CDs exhibited excitation-independent emission characteristics and yellow luminescence at 566 nm under ultraviolet-blue light excitation owing to the carbon–nitrogen bonds in the CDs. When Cr3+ was dissolved in the CD solution, the rate of decrease in the luminescence intensity was higher than that of the other experimental samples. The limit of detection was calculated to be 0.161 μM by determining the relationship between the Cr3+ concentration and luminescence intensity at 566 nm. Analysis of the luminescence-decay curve and luminescence intensity showed that the decline in yellow luminescence originated from photoinduced electron transfer between the Cr3+ ions and CDs. These results indicate that CDs can be utilized as fluorometric sensors for Cr3+ detection in wastewater.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 8","pages":"780 - 789"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840506","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}

引用次数: 0

Integrated simulation of HL-3 reversed magnetic shear configuration achieved by ion cyclotron wave and electron cyclotron wave combined injection 离子回旋波和电子回旋波联合注入对HL-3反磁剪切构型的综合模拟

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-02-27 DOI: 10.1007/s40042-025-01324-7

Lei Huang, Yijun Zhong, Xueyu Gong, Peng Yu, Qianhong Huang, Qingyi Tan, Pingwei Zheng, Lan Yin, Zhanhui Wang

{"title":"Integrated simulation of HL-3 reversed magnetic shear configuration achieved by ion cyclotron wave and electron cyclotron wave combined injection","authors":"Lei Huang, Yijun Zhong, Xueyu Gong, Peng Yu, Qianhong Huang, Qingyi Tan, Pingwei Zheng, Lan Yin, Zhanhui Wang","doi":"10.1007/s40042-025-01324-7","DOIUrl":"10.1007/s40042-025-01324-7","url":null,"abstract":"<div>The reversed magnetic shear configuration with internal transport barriers (ITBs), high specific pressure, and high bootstrap current is an important means to achieve high parameter operation in tokamaks. In this paper, based on the METIS integrated simulation platform, combined with the parameters of the HL-3 device, the joint injection of ion cyclotron wave (ICW) and electron cyclotron wave (ECW) to achieve the reversed magnetic shear configuration is investigated. By analyzing the effects of the ICW injection time, the ECW injection time, and the direction of the electron cyclotron current drive (ECCD) on the confinement, the reversed magnetic shear scenario of the high parameter is obtained, with the bootstrap current up to 45%, and the βN up to 3.2. The results show that the injection of ICW at the start-up stage can increase the plasma temperature and the magnetic diffusion time, which is conducive to maintaining the reversed magnetic shear configuration; when the off-axis ECW are injected timely in the magnetic diffusion stage, a strong drive current can be generated, so that the internal transport barrier, the high bootstrap current, and the reversed magnetic shear promote each other, maintain the reversed magnetic shear, and achieve the high confinement operation; when the ICW injection is delayed, the on-axis counter-ECCD can also form a good reversed magnetic shear. The results provide a reference for future reversed magnetic shear experiments in HL-3 to improve the discharge performance.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 8","pages":"732 - 744"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840507","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}

引用次数: 0

Photoresponse of few-layered GaS0.3Se0.7 alloy transistors 少层 GaS0.3Se0.7 合金晶体管的光响应

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-02-27 DOI: 10.1007/s40042-025-01297-7

Peng Chen, Fangqingluan Qiao, Jimin Shang, Lamei Zhang, Zijiong Li, Wen Yang, Shiquan Feng

引用次数: 0

Effects of Ce doping on structural, optical and photocatalytic activity of CuMn2O4 nanoparticles 掺杂 Ce 对 CuMn2O4 纳米粒子的结构、光学和光催化活性的影响

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-02-26 DOI: 10.1007/s40042-025-01314-9

N. Senguttuvan, K. Ravichandran, A. Prakasam

{"title":"Effects of Ce doping on structural, optical and photocatalytic activity of CuMn2O4 nanoparticles","authors":"N. Senguttuvan, K. Ravichandran, A. Prakasam","doi":"10.1007/s40042-025-01314-9","DOIUrl":"10.1007/s40042-025-01314-9","url":null,"abstract":"<div>In the current study, micro composites based on copper manganese oxides were created using citric acid as a fuel through the auto combustion method. This study investigates the impact of Ce-doping on the optical, structural, and electrical properties of CuMn2O4. We demonstrate that Ce-doping can be a practical way to circumvent this limitation. Our study attempts to provide an explanation for the reduction in grain size and Ce content in the CuMn2O4 host material. The attenuated total reflectance spectra place the Ce in octahedral and tetrahedral locations. The plasmonic pure and Ce-doping CuMn2O4’s capacity to capture visible light and swiftly transfer photogenerated electrons is responsible for this enhanced performance. The results also demonstrated that as the Ce concentration of the dopant increases, so does the percentage of 4CP (4-ChloroPhenol) degradation. The half-filled La electronic structure may be acting as a trapping center for the charge carriers, which is expected to result in increased photocatalytic activity. This study creates new avenues for assessing how the development of nanomaterials will affect energy and environmental applications.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 8","pages":"769 - 779"},"PeriodicalIF":0.8,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143840443","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}

引用次数: 0

Publisher Erratum: Nonlinear shock dynamics in charge-fluctuating dusty plasmas: the role of viscosity and mobility 出版者勘误：非线性激波动力学在电荷波动尘埃等离子体：粘度和流动性的作用

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-02-26 DOI: 10.1007/s40042-025-01325-6

Noor Ahmad Nayan, M. Himel Azad, M. Masum Haider

引用次数: 0

Influence of diverse dielectric materials on the performance of enhancement-mode AlGaN/GaN MISHEMTs with a β-Ga2O3 buffer and substrate for RF and power applications 不同介电材料对具有β-Ga2O3缓冲和衬底的增强模式AlGaN/GaN MISHEMTs性能的影响

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2025-02-21 DOI: 10.1007/s40042-025-01318-5

Sivamani Chinnaswamy, Gowtham Palanirajan, N. Vigneshwari, Jayasheela Moses, Ramkumar Natarajan, P. Murugapandiyan

{"title":"Influence of diverse dielectric materials on the performance of enhancement-mode AlGaN/GaN MISHEMTs with a β-Ga2O3 buffer and substrate for RF and power applications","authors":"Sivamani Chinnaswamy, Gowtham Palanirajan, N. Vigneshwari, Jayasheela Moses, Ramkumar Natarajan, P. Murugapandiyan","doi":"10.1007/s40042-025-01318-5","DOIUrl":"10.1007/s40042-025-01318-5","url":null,"abstract":"<div>In this study, we have investigated the influence of diverse dielectric materials on the performance of enhancement-mode AlGaN/GaN MISHEMTs using a β-Ga2O3 buffer and substrate. By employing a range of dielectrics (SiO2 (εr = 3.9), SiN (εr = 7.5), Al2O3 (εr = 9.8), HfO2 (εr = 25), La2O3 (εr = 27), and TiO2 (εr = 80)) for gate oxide and surface passivation, we aimed to explore their effects on device characteristics and identify trade-offs associated with their implementation. β-Ga2O3 has a wide bandgap (4.8 eV for β-phase), which is compatible with GaN (3.4 eV).The β-Ga2O3 substrates and the buffers can potentially be produced in larger sizes with good wafer quality and fewer defects compared to traditional GaN buffers and other substrates such as sapphire or silicon carbide (SiC). The dielectrics SiO2 (TiO2) delivered a drain current of 2.54 (2.79) A/mm, a transconductance of 0.33 (0.54) S/mm, a cut-off frequency of 47 (21) GHz for a drain voltage 20 V, an ON resistance of 1.56 (0.96) Ω mm, a breakdown voltage of 1012 (1906) V, and an intrinsic time delay of 0.84 (0.68) pico-seconds. The proposed device with a SiN (εr = 7.5) insulator exhibited the highest JFOM (VBR × fT) of 50.34 THz-V. This study paves the road for selecting the appropriate insulator for next-generation RF and power applications.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 7","pages":"678 - 691"},"PeriodicalIF":0.8,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749090","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}

引用次数: 0