Journal of Experimental and Theoretical Physics最新文献

Light Shift of Coherent Population Trapping Resonances in Cesium Vapor under the Laser Field with Dual Frequency–Amplitude Modulation 双频幅调制激光场下铯蒸气中相干居群俘获共振的光移

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/S1063776125600254

V. I. Vishnyakov, D. V. Brazhnikov, M. N. Skvortsov

{"title":"Light Shift of Coherent Population Trapping Resonances in Cesium Vapor under the Laser Field with Dual Frequency–Amplitude Modulation","authors":"V. I. Vishnyakov, D. V. Brazhnikov, M. N. Skvortsov","doi":"10.1134/S1063776125600254","DOIUrl":"10.1134/S1063776125600254","url":null,"abstract":"In this study, the light shift of coherent population trapping (CPT) resonances is studied in a miniature glass cell (~0.1 cm3) filled with 133Cs vapor. The atoms exposed to the radiation from a vertical-cavity surface-emitting laser (VCSEL). The laser current is modulated at a microwave frequency (≈4.6 GHz), which leads to the frequency modulation (FM) of output radiation. In addition, the light beam is transmitted through an electro-optic modulator (EOM), which is assembled as a Mach–Zehnder interferometer, acquiring amplitude modulation (AM). This dual (FM–AM) modulation leads to essentially nonlinear behavior of the function describing the light shift of the CPT resonance versus the total optical power in the cell. In particular, this function has an extremum that can be used to suppress the influence of small optical power variations in the cell on the stability of the CPT-based quantum frequency standard (QFS). The proposed scheme is characterized by a number of parameters such as the phase difference between the FM and AM signals as well as the bias voltage at EOM, which are additional degrees of freedom for controlling the behavior of the light shift of the CPT resonance. This can be used for the optimization of the QFS operation regime.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"138 1-6","pages":"50 - 57"},"PeriodicalIF":1.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892651","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

The Electronic Properties and I–V Characteristics of Deformed SWCNT Field Effect Transistors 变形swcnts场效应晶体管的电子特性和I-V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/S1063776124601459

M. K. Shamer, M. J. Majid

引用次数: 0

Nonstationary Heat Transfer in Graphene-Modified Hydrogels 石墨烯修饰水凝胶中的非稳态传热

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/S1063776124601502

B. G. Pokusaev, A. A. Moshin, D. P. Khramtsov, D. A. Nekrasov, A. V. Vyazmin, S. P. Karlov, I. A. Mikhailova

{"title":"Nonstationary Heat Transfer in Graphene-Modified Hydrogels","authors":"B. G. Pokusaev, A. A. Moshin, D. P. Khramtsov, D. A. Nekrasov, A. V. Vyazmin, S. P. Karlov, I. A. Mikhailova","doi":"10.1134/S1063776124601502","DOIUrl":"10.1134/S1063776124601502","url":null,"abstract":"In this study, we investigate the emergence of convective flows in graphene-modified hydrogels experiencing phase transition and determine the thermophysical characteristics of such systems; the results are compared with numerical simulation data. We analyze the effect of graphene on the heat-transfer properties of hydrogel materials as applied to 3D bioprinting technologies. Using holographic interferometry, gradient calorimetry, and resulting temperature dependences of refractive indices, we have developed the computational complex for calculating the thermophysical parameters of hydrogel materials with graphene admixtures. It has been established that even insignificant concentrations of graphene admixture substantially affects the thermophysical properties. It is also shown that a graphene admixture reduces the viscosity of hydrogel samples, which is measured by the Höppler viscometer. Using the experimentally obtained thermophysical and rheological properties of hydrogels with graphene and the results of numerical simulation, we have calculated the Rayleigh numbers for the corresponding convective heat-exchange modes in the experimental cells with a hydrogel. The Rayleigh number (Ra) demonstrates substantial differences in the heat transfer of the material and its convective properties that depend on the viscosity, density, thermal conductivity, and other parameters of the system. In our case, the variations of the Rayleigh number indicate the difference in the thermal and hydrodynamic properties of different hydrogels with graphene.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"138 1-6","pages":"13 - 24"},"PeriodicalIF":1.0,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892630","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

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

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