Moscow University Physics Bulletin最新文献

Specialized Rectangular Mask Pattern Design to Neutralize Charging Effects 专门的矩形掩模图案设计，以中和充电效果

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700213

Peng Zhang

引用次数: 0

Investigation of Magnetic and Magneto-Optical Properties of Copper Cobalt Ferrite Nanoparticles 铜钴铁氧体纳米颗粒的磁性和磁光性能研究

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700225

Mohammad Moradi, Asiyeh Rafiee

{"title":"Investigation of Magnetic and Magneto-Optical Properties of Copper Cobalt Ferrite Nanoparticles","authors":"Mohammad Moradi, Asiyeh Rafiee","doi":"10.3103/S0027134925700225","DOIUrl":"10.3103/S0027134925700225","url":null,"abstract":"In this study, copper cobalt ferrite nanoparticles were synthesized by chemical formula Co({}_{1-x})Cu({}_{x})Fe({}_{2})O({}_{4}) and ((x=0), (0.2), (0.4), (0.6), (0.8), (1)) by coprecipitation method. The X-ray diffraction pattern of the samples confirmed the single-phase spinel structure of the fabricated nanoparticles and the average size of the crystals was calculated from the entire width of the diffraction peak with the highest intensity and Scherrer’sequation. Using transmission electron microscope images, the nanoparticle size was about 10 nm. The magnetic properties of copper cobalt ferrite nanoparticles were measured by Alternative Gradient Force Magnetometer (AGFM) and it was seen that with increasing substitution of copper cations instead of cobalt cations in the samples, the amount of induction decreased and the saturation magnetization first increased and then decreased. In order to investigate the Faraday’s effect on copper cobalt ferrite nanoparticles, the transmittance values were measured using a laboratory experiment and their graphs were plotted in terms of the applied magnetic field, all of which were in agreement with the theory. In addition, transmittance was investigated for two angular positions of the analyzer at (-45^{circ}) and (+45^{circ}) in different fields.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 1","pages":"119 - 126"},"PeriodicalIF":0.4,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938371","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

Geostrophic and Wind-Driven Components of the Southern Ocean Water Dynamics 南大洋水动力学的地转和风驱动分量

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700031

V. V. Bagatinskaya, N. A. Diansky, V. A. Bagatinsky, A. V. Gusev, E. G. Morozov

{"title":"Geostrophic and Wind-Driven Components of the Southern Ocean Water Dynamics","authors":"V. V. Bagatinskaya, N. A. Diansky, V. A. Bagatinsky, A. V. Gusev, E. G. Morozov","doi":"10.3103/S0027134925700031","DOIUrl":"10.3103/S0027134925700031","url":null,"abstract":"The contributions of geostrophic and wind-driven factors to the formation of the mean Antarctic circumpolar current (ACC) climatic structure were studied using the general ocean circulation model INMOM (Institute of Numerical Mathematics Ocean Model). The aim of the study was to separate the geostrophic and wind-driven components of the ACC. The simulation was carried out for summer (February) and winter (August) conditions in the Southern Hemisphere during the climatic period from 1993 to 2012. It is shown that, despite strong winds over the Southern Ocean, the geostrophic circulation factor is usually much stronger than the wind-driven factor. Nevertheless, the contribution of the wind-driven component to the increase in the near-surface zonal velocity can reach 15–20(%) of the geostrophic velocity. Winds contribute to a decrease in the mean dynamic topography (MDT) from the open ocean to the coast of Antarctica. The influence of wind on the formation of the barotropic stream function of the current is more pronounced than on the MDT. Geostrophic transport of the ACC remains nearly the same in winter and summer. Due to wind effects, the total transport of ACC around Antarctica increases on average by 10–15 Sv in summer and 15–20 Sv in winter. The three-jet structure of the ACC was confirmed using numerical modelling and the ‘‘diagnosis–adaptation’’ method according to EN4 data. It is demonstrated that the three-jet structure of the ACC has a geostrophic nature.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 1","pages":"160 - 173"},"PeriodicalIF":0.4,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938370","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

A Triple Point on the Phase Diagram of a One-Component System in the van der Waals Approximation 范德华近似中单组分系统相图上的三相点

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700134

P. N. Nikolaev

引用次数: 0

Elliptically Dependent Inclusion of the Initial Momentum in the Barrier Suppression Ionization Rate 势垒抑制电离速率中初始动量的椭圆相关包涵

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700201

Maida Š. Kurtović, Violeta M. Petrović, Ivan D. Petrović

引用次数: 0

Markov Random Process on the Heisenberg Group Heisenberg群上的Markov随机过程

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700043

I. A. Bogatyrev, M. B. Vavilov, I. A. Sukharev, E. T. Shavgulidze

{"title":"Markov Random Process on the Heisenberg Group","authors":"I. A. Bogatyrev, M. B. Vavilov, I. A. Sukharev, E. T. Shavgulidze","doi":"10.3103/S0027134925700043","DOIUrl":"10.3103/S0027134925700043","url":null,"abstract":"The paper investigates a model of the motion of a Brownian particle on (mathbb{C}^{2}). A six-dimensional random process is considered, whose states are described by the coordinates of the particle and the complex analog of the area swept out by the radius vector of the point as it moves along the trajectories of a four-dimensional Brownian bridge. Using the methods of integration over the conditional Wiener measure, an expression for the transition probability density of a random process from an arbitrary state to a subsequent one is obtained. A connection is revealed between the trajectories of the process under consideration and the Heisenberg group constructed over the field of complex numbers (H_{3}(mathbb{C})). The continuity in time and Hölder property with order (alpha<1/2) of the oriented area function (S(t)) are proven, as well as the Heisenberg Markov property of the process. The heat equation describing the system’s evolution and the corresponding sub-Laplacian are derived. The solution to the equation is obtained in the form of a functional integral. Performing a Wick rotation allows for drawing an analogy between the considered process and the motion of an electron in a magnetic field.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 1","pages":"36 - 49"},"PeriodicalIF":0.4,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938447","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

System for Monitoring the Process of Reactive Ion Etching of Silicon for Nanostructure Fabrication 纳米结构硅反应离子蚀刻过程监测系统

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700158

I. I. Tsiniaikin, A. S. Andreeva, P. O. Mikhailov, M. A. Kolpakov, G. V. Nibudin, G. V. Presnova, M. Yu. Rubtsova, D. E. Presnov, O. V. Snigirev, V. A. Krupenin, A. S. Trifonov

{"title":"System for Monitoring the Process of Reactive Ion Etching of Silicon for Nanostructure Fabrication","authors":"I. I. Tsiniaikin, A. S. Andreeva, P. O. Mikhailov, M. A. Kolpakov, G. V. Nibudin, G. V. Presnova, M. Yu. Rubtsova, D. E. Presnov, O. V. Snigirev, V. A. Krupenin, A. S. Trifonov","doi":"10.3103/S0027134925700158","DOIUrl":"10.3103/S0027134925700158","url":null,"abstract":"A system for monitoring the operation of a laser interferometer in a reactive ion etching setup has been developed. For the precise calibration of the etching rate of the top silicon layer in silicon-on-insulator materials, a series of chips with identical structures were fabricated. The thickness of the structure on each chip varied depending on the etching time. The heights of the resulting steps were measured using the tapping mode of an atomic force microscope. For the etching mode in a plasma of CF({}_{4}) and O({}_{2}) gases (flow ratio (20:5), pressure 4 Pa, power 40 W), the silicon etching rate was determined to be (0.31pm 0.1) nm/s. The adduce parameters allow stopping silicon etching at a depth of ({sim}5) to (120) nm with an accuracy of no worse than 2 nm. The obtained results make it possible to address a number of tasks in the fabrication of various silicon nanoelectronic devices. In particular, the process of forming silicon channel nanowires for field-effect transistors requires high-precision control of the silicon layer thickness during reactive ion etching.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 1","pages":"92 - 97"},"PeriodicalIF":0.4,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938450","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

Study of Natural Phenomenon of Thermal Bar: Field Observations, Laboratory, and Mathematical Modeling 热棒自然现象的研究：野外观测、实验室和数学建模

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700018

N. S. Blokhina

引用次数: 0

Testing Ionospheric Model NeQuick 2 Using Satellite Measurements of Electron Concentration 利用卫星测量电子浓度测试电离层模型NeQuick 2

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-05-11 DOI: 10.3103/S0027134925700122

B. A. Matiushin, V. I. Zakharov, N. A. Suhareva, O. V. Shestakov

引用次数: 0

Deep Learning Ghost Polarimetry of Two-Dimensional Objects with Amplitude Anisotropy 具有振幅各向异性的二维物体的深度学习鬼偏振测量