Moscow University Physics Bulletin最新文献

Analysis of Balmer Series Emission in the Solar Flare SOL2017-04-21 太阳耀斑中Balmer系列辐射的分析[j]

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700705

Yu. A. Kupryakov, V. A. Maliutin, K. V. Bychkov, A. B. Gorshkov, O. M. Belova

{"title":"Analysis of Balmer Series Emission in the Solar Flare SOL2017-04-21","authors":"Yu. A. Kupryakov, V. A. Maliutin, K. V. Bychkov, A. B. Gorshkov, O. M. Belova","doi":"10.3103/S0027134925700705","DOIUrl":"10.3103/S0027134925700705","url":null,"abstract":"We observed a B6.2-class solar flare in active region NOAA 12651 using the HSFA spectrograph at the Ondřejov Observatory in hydrogen spectral lines. After processing the spectra, the integral emission fluxes in the H(alpha), H(beta), and H(varepsilon) lines were determined. Within the heated-gas approach, a theoretical reconstruction of the plasma parameters was performed, taking into account the physical conditions in the chromosphere, including self-absorption in the spectral lines. Treating the observed fluxes requires the assumption of inhomogeneous gas. Agreement between the theoretical and observed fluxes is achieved in a model involving the superposition of two gas layers. Behind lies a dense gas with concentration (N) ranging from (3times 10^{12}) to (3times 10^{13}) cm({}^{-3}), and between it and the observer is a rarefied layer where (N=(3{-}6)times 10^{10}) cm({}^{-3}). The layer thickness is in the range from 600 to 3000 km, the temperature—between 4000 and 7200 K, and the turbulent velocity—from 0 to 90 km/s. The presence of dense regions indicates that the source of the observed emission originates from the middle chromosphere, not higher than 1000 km.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"613 - 618"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161989","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

Influence of Thermal Annealing Regimes on the Magnetic Permeability of (CoFe)({}_{mathbf{75}})Si({}_{mathbf{10}})B({}_{mathbf{15}})-Based Amorphous Ribbons 热退火制度对（CoFe） ({}_{mathbf{75}}) Si ({}_{mathbf{10}}) B ({}_{mathbf{15}})基非晶带磁导率的影响

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700638

A. A. Isayeva, V. I. Ahmadov, F. Sh. Mammadov, G. Z. Askerova, S. M. Musayeva

{"title":"Influence of Thermal Annealing Regimes on the Magnetic Permeability of (CoFe)({}_{mathbf{75}})Si({}_{mathbf{10}})B({}_{mathbf{15}})-Based Amorphous Ribbons","authors":"A. A. Isayeva, V. I. Ahmadov, F. Sh. Mammadov, G. Z. Askerova, S. M. Musayeva","doi":"10.3103/S0027134925700638","DOIUrl":"10.3103/S0027134925700638","url":null,"abstract":"This study is dedicated to the influence of thermal annealing regimes on the magnetic permeability of (CoFe)({}_{75})Si({}_{10})B({}_{15}) amorphous ribbon samples. Due to their unique structure, amorphous materials are distinguished by their high magnetic properties, which can be significantly influenced by thermal annealing processes. In this work, the dependence of maximum magnetic permeability on isothermal holding time and temperature during thermal annealing in air at 200–400({}^{circ})C was investigated, and diffusion processes were also studied. The main objective is to understand how the maximum magnetic permeability of (CoFe)({}_{75})Si({}_{10})B({}_{15}) amorphous ribbon samples changes at different temperatures and isothermal holding times. The results show that annealing at temperatures between 300–400({}^{circ})C significantly improves the magnetic permeability of the ribbons, thereby expanding their potential applications. This study identifies how the magnetic properties of amorphous ribbons can be enhanced through thermal annealing. This research emphasizes the importance of optimizing thermal annealing to further develop the application areas of amorphous ribbon.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"601 - 605"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162142","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

Issues of Improving the Efficiency and Resolution of the Neutron Spectrometer for the National Center for Physics and Mathematics 提高国家物理数学中心中子谱仪效率和分辨率的问题

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700493

A. M. Lapik, S. S. Belyshev, V. V. Varlamov, L. Z. Dzhilavyan, A. A. Kuznetsov, A. L. Polonski, A. V. Rusakov, V. I. Shvedunov

引用次数: 0

Gravitational Interaction of a Charge with a Cosmic String 电荷与宇宙弦的引力相互作用

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700729

Yu. V. Grats, P. A. Spirin

引用次数: 0

Conditions for the Formation of Superconducting Pair Correlations in Spherical Even–Even Nuclei 球形偶偶核中超导对相关形成的条件

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700468

V. A. Kuz’min, T. V. Tetereva

引用次数: 0

Dual Symmetry of Effective Dense QCD Models 有效密集QCD模型的对偶对称性

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700559

R. N. Zhokhov, K. G. Klimenko, T. G. Khunjua

引用次数: 0

Scientific Results on Heavy-Ion Physics in the Compact Muon Solenoid (CMS) Experiment at the Large Hadron Collider (LHC) 大型强子对撞机（LHC）致密介子螺线管（CMS）实验中重离子物理的科学结果

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S002713492570047X

S. V. Petrushanko, on behalf of CMS Collaboration

引用次数: 0

Estimation of Possible Supersaturation of Solutions during Ion Exchange in Porous Media 多孔介质中离子交换过程中溶液可能过饱和的估计

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700602

N. A. Tikhonov

{"title":"Estimation of Possible Supersaturation of Solutions during Ion Exchange in Porous Media","authors":"N. A. Tikhonov","doi":"10.3103/S0027134925700602","DOIUrl":"10.3103/S0027134925700602","url":null,"abstract":"The phenomenon of isothermal supersaturation of solutions in a porous medium during ion exchange is studied using mathematical modelling. The phenomenon consists in the formation of a solution with a concentration significantly exceeding the maximum solubility of the substance under ordinary conditions, and no precipitation occurs within the pores of the ion exchanger. In the works of several authors, the general nature of the phenomenon has been noted, and an explanation has been provided for the stability of the supersaturated solution in micropores. The question of why precipitation does not occur in larger pores remains open. In the present work, a model for the variation in the number of particles of the condensed phase in pores is proposed, and estimations are obtained that make it possible to determine the possible supersaturation depending on the process parameters. It is shown that the phenomenon under consideration can be explained not by a change in the thermodynamic conditions in the porous medium relative to ordinary conditions, but by the effect of dynamic equilibrium between the aggregation of condensed phase particles in the interior of the pores, their diffusion, and their decomposition near the surface of the ion exchanger grains. The proposed hypothesis is supported by quantitative analysis and comparison with available experimental data.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"449 - 457"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162620","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

Features of Pinning Mechanism Determination in Samples of the Class 111 Family of Iron Pnictides 铁类化合物111类样品中钉钉机理测定的特点

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700663

E. M. Fomina, A. I. Shilov, E. O. Rakhmanov, I. V. Zhuvagin

{"title":"Features of Pinning Mechanism Determination in Samples of the Class 111 Family of Iron Pnictides","authors":"E. M. Fomina, A. I. Shilov, E. O. Rakhmanov, I. V. Zhuvagin","doi":"10.3103/S0027134925700663","DOIUrl":"10.3103/S0027134925700663","url":null,"abstract":"The applicability of the values of the strength (H_{textrm{irr}}) of the irreversibility field and the strength (H_{c2}) of the upper critical field in pinning mechanism determination in a sample of the family of iron pnictides of the class 111, NaFe({}_{1-x})Co({}_{x})As, was analyzed in this work. Methods for calculating (H_{textrm{irr}}) and (H_{c2}) were also considered. The first method for determining the strength (H_{textrm{irr}}) of the irreversibility field is based on extrapolation of the zeros of the graph (J_{c}(H)). The second method, considered exclusively from a theoretical perspective, is Kramer’s method. It is based on extrapolation of the zeros of the graph (J_{c}^{1/2}B^{1/4}(B)). Each of the methods requires qualitative identification of the graph zeros in order to obtain the most accurate result. The strength of the upper critical field is determined by extrapolating the points obtained at the intersection of the graph (M(T)) with the line at the level (M=0). Due to the limited operating range of the measuring device, the values of (H_{textrm{irr}}) for the NaFe({}_{1-x})Co({}_{x})As sample were obtained by approximating data from previously acquired results. When using (H_{textrm{irr}}), a volume pinning type was identified. The values of (H_{c2}) were also calculated based on already obtained data and allowed the surface pinning mechanism to be determined, which is consistent with earlier studies. This indicates that the pinning mechanism determined using (H_{textrm{irr}}) was established incorrectly. It was found that the use of irreversibility field strength values for the NaFe({}_{1-x})Co({}_{x})As sample may lead to incorrect identification of the pinning type.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"595 - 600"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162141","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

Radial Dependence of the Nucleon Effective Mass and Ground-State Properties of Magic Nuclei 核子有效质量与幻核基态性质的径向依赖性

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700481

D. Yu. Smoliannikov, N. N. Arsenyev, A. P. Severyukhin

引用次数: 0