Journal of Experimental and Theoretical Physics最新文献_第2页

Absorption of Ultrashort Laser Pulses in an Optically Dense Medium 超短激光脉冲在光密集介质中的吸收

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2025-04-30 DOI: 10.1134/S106377612460065X

V. A. Astapenko

引用次数: 0

Effect of Temperature and Magnetic Field on the Resistivity of a Quasi Two Dimensional in GaP/AlP/GaP Layered Structures 温度和磁场对GaP/AlP/GaP层状结构准二维电阻率的影响

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2025-04-30 DOI: 10.1134/S1063776124601022

Do Muoi

引用次数: 0

Spectral Properties of N6+, Ne9+, and Al12+ Ions in Dense Plasma 致密等离子体中N6+、Ne9+和Al12+离子的光谱特性

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2025-04-30 DOI: 10.1134/S106377612460106X

M. Tyagi, A. Sharma

{"title":"Spectral Properties of N6+, Ne9+, and Al12+ Ions in Dense Plasma","authors":"M. Tyagi, A. Sharma","doi":"10.1134/S106377612460106X","DOIUrl":"10.1134/S106377612460106X","url":null,"abstract":"The influence of the dense plasma environment on the energy levels and transition rates of H-like N6+, Ne9+, and Al12+ ions have been examined. The structural and spectral properties have been analyzed by employing the relativistic configuration interaction (RCI) technique using the ion sphere model as the modified interactive potential between the nucleus and the electron. It is observed that for every transition, the transition energies are red shifted. The plasma screening effect on weighted oscillator strengths has also been examined. Additionally, the ground state thermodynamic pressure within the ion sphere and the radial wavefunctions of the spectral electron for the various states of N6+, Ne9+, and Al12+ ions at plasma density 1 × 1023 cm–3 were also studied. The line intensity ratio has also been computed for the first two spectral lines: [1s1/2 – 2p3/2 (1–3)] and [1s1/2 – 2p1/2 (1–2)]. Our computed data exhibits a good quantitative agreement with the other results reported in the literature as well as with the experimental results reported in the National Institute of Science and Technology (NIST) database. The current findings will be helpful in laboratory and astrophysical plasma modelling and characterization of hot dense plasma.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"138 1-6","pages":"35 - 49"},"PeriodicalIF":1.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892650","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

Magnetic Interparticle Interactions and Superparamagnetic Blocking of Powder Systems of Biogenic Ferrihydrite Nanoparticles 生物铁氧体纳米粒子粉末系统的磁性粒子间相互作用和超顺磁性阻塞

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S1063776123120075

A. A. Krasikov, Yu. V. Knyazev, D. A. Balaev, S. V. Stolyar, V. P. Ladygina, A. D. Balaev, R. S. Iskhakov

{"title":"Magnetic Interparticle Interactions and Superparamagnetic Blocking of Powder Systems of Biogenic Ferrihydrite Nanoparticles","authors":"A. A. Krasikov, Yu. V. Knyazev, D. A. Balaev, S. V. Stolyar, V. P. Ladygina, A. D. Balaev, R. S. Iskhakov","doi":"10.1134/S1063776123120075","DOIUrl":"10.1134/S1063776123120075","url":null,"abstract":"The magnetic-field dependence of the superparamagnetic-blocking temperature TB of systems of antiferromagnetically ordered ferrihydrite nanoparticles has been investigated and analyzed. We studied two powder systems of nanoparticles: particles of “biogenic” ferrihydrite (with an average size of 2.7 nm), released as a result of vital functions of bacteria and coated with a thin organic shell, and particles of biogenic ferrihydrite subjected to low-temperature annealing, which cause an increase in the average particle size (to 3.8 nm) and burning out of the organic shell. The character of the temperature dependences of magnetization, measured after cooling in a weak field, as well as the shape of the obtained dependences TB(H), demonstrate peculiar features, indicating the influence of magnetic interparticle interactions. A detailed analysis of the dependences TB(H) within the random magnetic anisotropy model made it possible to estimate quantitatively the intensity of magnetic particle–particle interactions and determine the magnetic anisotropy constants of individual ferrihydrite particles.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 6","pages":"903 - 913"},"PeriodicalIF":1.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579307","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

Accuracy, Performance, and Transferability of Interparticle Potentials for Al–Cu Alloys: Comparison of Embedded Atom and Deep Machine Learning Models 铝铜合金粒子间电位的准确性、性能和可转移性：嵌入式原子模型与深度机器学习模型的比较

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S1063776123120208

E. O. Khazieva, N. M. Shchelkatchev, A. O. Tipeev, R. E. Ryltsev

{"title":"Accuracy, Performance, and Transferability of Interparticle Potentials for Al–Cu Alloys: Comparison of Embedded Atom and Deep Machine Learning Models","authors":"E. O. Khazieva, N. M. Shchelkatchev, A. O. Tipeev, R. E. Ryltsev","doi":"10.1134/S1063776123120208","DOIUrl":"10.1134/S1063776123120208","url":null,"abstract":"In several recent years, a significant progress has been made in atomistic simulation of materials, involving the application of machine learning methods to constructing classical interatomic interaction potentials. These potentials are many-body functions with a large number of variable parameters whose values are optimized with the use of energies and forces calculated for various atomic configurations by ab initio methods. In the present paper a machine learning potential is developed on the basis of deep neural networks (DP) for Al–Cu alloys, and the accuracy and performance of this potential is compared with the embedded atom potential. The analysis of the results obtained implies that the DP provides a sufficiently high accuracy of calculation of the structural, thermodynamic, and transport properties of Al–Cu alloys in both solid and liquid states over the entire range of compositions and a wide temperature interval. The accuracy of the embedded atom model (EAM) in calculating the same properties is noticeably lower on the whole. It is demonstrated that the application of the potentials based on neural networks to the simulation on modern graphic processors allows one to reach a computational efficiency on the same order of magnitude as those of the embedded atom calculations, which at least four orders of magnitude higher than the computational efficiency of ab initio calculations. The most important result is that about the possibility of application of DP parameterized with the use of configurations corresponding to melts and perfect crystals to the simulation of structural defects in crystals and interphase surfaces.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 6","pages":"864 - 877"},"PeriodicalIF":1.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139590355","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

Magnetically Induced Flows in Thrombosed Channels with a Ferrofluid Layer 带铁流体层的血栓通道中的磁诱导流动

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S1063776123120117

A. Yu. Musickhin, A. Yu. Zubarev

引用次数: 0

Quasilinear Simulation of the Development of Weibel Turbulence in Anisotropic Collisionless Plasma 各向异性无碰撞等离子体中魏伯尔湍流发展的准线性模拟

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S1063776123120099

A. A. Kuznetsov, A. A. Nechaev, M. A. Garasev, Vl. V. Kocharovsky

{"title":"Quasilinear Simulation of the Development of Weibel Turbulence in Anisotropic Collisionless Plasma","authors":"A. A. Kuznetsov, A. A. Nechaev, M. A. Garasev, Vl. V. Kocharovsky","doi":"10.1134/S1063776123120099","DOIUrl":"10.1134/S1063776123120099","url":null,"abstract":"A spectral quasilinear approach to the problem of TEM-Weibel instability in an anisotropic collisionless plasma is developed, which takes into account only the integral nonlinear interaction of modes through the joint variation of the spatially averaged particle velocity distribution induced by these modes. Within this approximation, a closed system of equations is obtained for the one- and two-dimensional evolution of spatial modes (harmonics) of the distribution function of particles and the electromagnetic field under conditions when the plasma anisotropy axis, the wave vector, and the magnetic field of the modes are orthogonal to each other. The numerical solution of this system of equations is compared with the available results of one-dimensional analytical quasilinear theory in the region of its applicability, as well as with the results of two-dimensional simulation by the particle-in-cell method, which also takes into account the direct four-wave interaction of modes. It is established that in the simplest cases of one-dimensional and axially symmetric two-dimensional problems for a bi-Maxwellian plasma, quasilinear phenomena play the leading role at a quite long stage of nonlinear development of turbulence. It is noted that at a later stage of decay of turbulence and in a more general formulation of the problem, in particular, in the presence of an external magnetic field, the direct nonlinear interaction of modes can manifest itself along with quasilinear phenomena. Based on the analysis carried out, the contribution of certain nonlinear effects to the evolution of the spatial spectrum of Weibel turbulence is revealed, and the properties of this turbulence are studied, including the self-similar character and qualitatively different stages of the dynamics of unstable modes.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 6","pages":"966 - 985"},"PeriodicalIF":1.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579482","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

Determination of the Strain Tensor and the Elastic Stress Fields in a Diamond Plate with a High Bending Curvature Using Local Laue Diffraction Data 利用局部 Laue 衍射数据确定高弯曲曲率金刚石板的应变张量和弹性应力场

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S106377612312004X

R. V. Digurov, V. D. Blank, V. N. Denisov, S. Yu. Martyushov, B. P. Sorokin, S. A. Terent’ev, S. N. Polyakov

引用次数: 0

Ghost Fiber Optic Endoscopy with Several Single-Pixel Detectors in the Object Arm 在物体臂上安装多个单像素探测器的幽灵光纤内窥镜

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S1063776123120038

D. A. Balakin, A. V. Belinsky

引用次数: 0

On the Heat Capacity of Quantum Hard Sphere Fluid 论量子硬球流体的热容量

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S1063776123120130

S. M. Stishov

引用次数: 0