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Iranian Journal of Physics Research最新文献

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Strong coupling of magnetization dynamics of two antiferromagnetic layers by phonons 声子对两个反铁磁层磁化动力学的强耦合
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.21617
{"title":"Strong coupling of magnetization dynamics of two antiferromagnetic layers by phonons","authors":"","doi":"10.47176/ijpr.23.1.21617","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.21617","url":null,"abstract":"Strong and long-range coupling of the magnetization dynamics of the two antiferromagnetic layers mediated by the phonons transferred through a nonmagnetic insulator has been investigated. The magnetization dynamics in one of the antiferromagnetic layers via a magnetoelastic interaction leads to the excitation of phonons and their pumping to the nonmagnetic layer. The transfer of phonons, which carry angular momentum, through a nonmagnetic insulator from one antiferromagnetic layer to another, leads to an interference pattern in the absorption spectrum, which represents the coupling of magnetization dynamics of two layers.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194507","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
Investigation of electromagnetic oscillations and their instabilities in a nonuniform quantum electron-positron magnetoplasma interacting with a short pulse laser 短脉冲激光作用下非均匀量子电子-正电子磁等离子体的电磁振荡及其不稳定性研究
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.81566
{"title":"Investigation of electromagnetic oscillations and their instabilities in a nonuniform quantum electron-positron magnetoplasma interacting with a short pulse laser","authors":"","doi":"10.47176/ijpr.23.1.81566","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.81566","url":null,"abstract":"In this article, we investigated electromagnetic oscillations in a quantum nonuniform electron-positron magnetoplasm interacting with a short pulse laser, in low frequency approximation, in two parallel and perpendicular directions. According to our investigations, the waves in the parallel direction are affected by ponderomotive force, vigorously. Quantum corrections cause the magnitude of this force to change and accordingly, cause the magnitude of phase and group velocities of the waves, as well as, their instability to change. In the parallel direction, initial quantities of number density and streaming velocity affect the waves directly, but the magnetic field affects these waves through the ponderomotive force, indirectly. As well, absorption of the laser pulse causes the plasma waves to grow in the laser direction and damp in the opposite direction. While, the amplification of the laser causes the waves to damp in the laser direction and grow in the opposite direction. In the perpendicular direction, the waves are influenced by the transverse gradient of initial quantities of number density, streaming velocity and external magnetic, in addition to their amounts, while these gradients don't have any effect on the parallel waves. Likewise, we investigate the behavior of the waves for different values of the transverse gradients. So that we indicate that the presence of each of gradients can completely change the behavior of the waves. As well, the investigations indicated that the presence of the transverse gradient of the initial density or streaming velocity couldn’t create the electromagnetic waves in the perpendicular direction but, the transverse gradient of the magnetic field could initiate these waves.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194511","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
Calculation of photon absorbed dose kernel in a homogeneous water phantom by Monte Carlo Geant4 toolkit 用Monte Carlo Geant4工具计算均匀水影中光子吸收剂量核
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.81563
{"title":"Calculation of photon absorbed dose kernel in a homogeneous water phantom by Monte Carlo Geant4 toolkit","authors":"","doi":"10.47176/ijpr.23.1.81563","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.81563","url":null,"abstract":"Nowadays, convolution/superposition(C/S) is used to calculate absorbed dose distribution by using the absorbed dose kernel(ADK). ADK describes the absorbed dose distribution per number of interaction at a small volume around the point of photon interaction. The purpose of this study is to calculate ADK and investigate its angular and radial behavior. In this study, ADK is calculated in a homogeneous water phantom in the polar coordinates by using the Monte Carlo Geant4 toolkit for monoenergetic photons with energies in the range 0.3MeV-5MeV. To study accurately, ADK is divided into several groups in order of produced charged particle set in motion at each photon interaction. Our result shows ADK rapidly decreases as the polar angle, with respect to the incident photon direction, is increased. As the radial distance from the interaction point increases, ADK is raised and then strongly decreased. ADK is symmetrically distributed around the point of interaction for low incident photon energy while forward distributed for high incident energy photons.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194520","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
Calculation of thermal conductivity of UO2±0.25 solving phonon Boltzmann equation UO2±0.25解声子玻尔兹曼方程的导热系数计算
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.51457
{"title":"Calculation of thermal conductivity of UO2±0.25 solving phonon Boltzmann equation","authors":"","doi":"10.47176/ijpr.23.1.51457","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.51457","url":null,"abstract":"In this study, the effect of point defects on the thermal conductivity of UO2 is investigated. Especially, the effects of oxygen vacancy and interstitial are considered. Thermal conductivity of UO2, UO2+0.25 and UO2-0.25 is calculated by solving the phonon Boltzmann equation (BTE) under the relaxation time approximation (RTA). The results show that introducing any defects to the lattice structure of UO2 decreases thermal conductivity significantly. In addition, the results show that the variation of the thermal conductivity of UO2-0.25 is much lower than that of UO2+0.25 in the temperature interval of 300 to 1000 Kelvin.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194510","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
Investigation and optimization of electron gun beam, based on simulation and experimental results 基于仿真和实验结果的电子束研究与优化
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.71539
{"title":"Investigation and optimization of electron gun beam, based on simulation and experimental results","authors":"","doi":"10.47176/ijpr.23.1.71539","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.71539","url":null,"abstract":"Nowadays, by expanding the application of thin layers in industry and medical sciences, their fabrication methods have also received attention. One of those methods is the vaporizing material method with the help of an electron gun. The most important part in the electron gun is the electron optic, which is responsible for producing and accelerating electrons, so that it becomes possible to vaporize refractory materials in a shorter period of time by better modifying and controlling the electron beam (the shape and diameter of the electron beam) at the target location. The reduction and control of the beam diameter in this evaporation source depends on various parameters such as device geometry, magnetic field intensity, electric power, etc. Therefore, in this research, the effect of those parameters was investigated by conducting experiments and using finite element and modeling software. The simulation results revealed that the effect of the effective parameters on the beam diameter can be predicted to a good extent, so that the diameter of the electron beam decreases by changing the geometrical shape, size and displacement of the output beam components. Then, the new electron gun, compared to the existing prototype, is optimized by applying these changes in the construction of the device and conducting experiments, and its beam diameter is reduced by 40% to be more focused.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194771","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
Improving corrosion resistance of aluminum by zirconium carbide thin films 碳化锆薄膜提高铝的耐蚀性
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.91579
{"title":"Improving corrosion resistance of aluminum by zirconium carbide thin films","authors":"","doi":"10.47176/ijpr.23.1.91579","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.91579","url":null,"abstract":"In this paper, zirconium carbide (ZrC) thin films were deposited on glass and aluminum substrates using DC magnetron sputtering. It was found that different ratios of acetylene gas (C2H2, as a reactive gas) in the gas mixture of acetylene and argon (Ar, as a sputtering gas) affect the microstructural properties, corrosion behavior, and protection efficiency of ZrC thin films. X-ray diffraction (XRD) was used to characterize the microstructural properties of thin films. The corrosion behavior of thin films in a 3.5% NaCl solution was evaluated by potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS). FESEM was also employed to examine thin films' surface morphology and thickness.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194508","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
Quantum transport in the Ising chain: global vs local approach Ising链中的量子输运:全局vs局部方法
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.11598
{"title":"Quantum transport in the Ising chain: global vs local approach","authors":"","doi":"10.47176/ijpr.23.1.11598","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.11598","url":null,"abstract":"We study energy and spin transport in a one-dimensional Ising chain which is connected to two separate heat baths on both sides. By applying the Born-Markov approximation, within the global approach, we derive the Markovian master equation of the system, and also the explicit form of the Lindblad operators and the steady state. Thereafter, we investigate the behavior of energy and spin dynamics of the system in the global regime. Finally, we solve the problem with the local approach, and we show that the results are not the same for both approaches.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194766","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
Hierarchy problem in the Standard Model and extended Higgs potential with scale symmetry 标准模型中的层次问题和具有尺度对称的扩展希格斯势
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.11627
{"title":"Hierarchy problem in the Standard Model and extended Higgs potential with scale symmetry","authors":"","doi":"10.47176/ijpr.23.1.11627","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.11627","url":null,"abstract":"In this research we introduce a model by adding two singlet scalars to the Higgs potential of the Standard Model and imposing scale symmetry to address the hierarchy problem. The scale symmetry plays a crucial role here. In the classical limit, all the scalars are massless. Only one of the singlet scalars and the Higgs doublet acquire non-zero expectation value. After diagonalization of the mass matrix, we have a massless singlet scalar, the so-called scalon, and two massive scalars. From quantum corrections, the scalon gets mass. Besides theoretical constraints on the parameters of the model, we impose bounds on the triple Higgs interactions provided by ATLAS and CMS detectors at the LHC.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194772","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
Nonlinear brain dynamics in neural field model and harmonic generation responses to the external stimuli 神经场模型中的非线性脑动力学及对外界刺激的谐波产生反应
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.11595
{"title":"Nonlinear brain dynamics in neural field model and harmonic generation responses to the external stimuli","authors":"","doi":"10.47176/ijpr.23.1.11595","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.11595","url":null,"abstract":"The most important nonlinear feature in the EEG response to external stimuli is the harmonic generation and entrainment which is due to the interaction between stimuli and ongoing brain oscillations. In this paper, we study the nonlinear brain dynamics and harmonic generation responses to the periodic external stimuli by employing continuum neural field model. A compact dynamical model of brain activity is first introduced, and the governing equations for the evolution of potential are obtained. Then, using the perturbation method and multiple time scales, we show brain response oscillations in harmonic drive frequency consistent with the recorded scalp EEGs from awake human subjects. Finally, to confirm the experimentally observed results of interaction between photic driving and brain dynamics, we have numerically simulated the full neural field model equations, and have shown harmonic frequency generation over a range of external frequencies.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194767","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
Study of hadron production through pair annihilation in the noncommutative standard model 非交换标准模型中通过对湮灭产生强子的研究
Iranian Journal of Physics Research Pub Date : 2023-06-01 DOI: 10.47176/ijpr.23.1.81550
{"title":"Study of hadron production through pair annihilation in the noncommutative standard model","authors":"","doi":"10.47176/ijpr.23.1.81550","DOIUrl":"https://doi.org/10.47176/ijpr.23.1.81550","url":null,"abstract":"Different scattering processes have been yet studied in the noncommutative standard model (SM) and different limits on the noncommutative scale have been determined. In the present work we, for the first time, study the hadron production process through pair annihilation, in the noncommutative standard model. In the experimental studies of hadron production through pair annihilation a wide range of collision energy spectrum () has been considered. In our study, we restrict ourselves to the ranges so having available experimental data from Belle Collaboration for B-meson production in the process we shall determine a lower limit for the noncommutative scale. In fact, by studying the effect of noncommutativity on the differential cross section at the parton level () as well as the fragmentation function of meson and comparing the theoretical results and experimental data the lower limit will be determined. Having analytical results for the pair annihilation cross section in the noncommutative SM it would be possible to specify the production cross section of each meson or baryon for various values of noncommutative scale.","PeriodicalId":38961,"journal":{"name":"Iranian Journal of Physics Research","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194504","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
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