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Magnetic properties of iron oxide nanoparticles in the matrix of potassium-aluminoborate glasses subject to thermoradiation treatment 热辐射处理的硼酸钾铝玻璃基体中氧化铁纳米颗粒的磁性能
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340502
M. K. Salakhitdinova, E. M. Ibragimova, O. K. Kuvandikov
{"title":"Magnetic properties of iron oxide nanoparticles in the matrix of potassium-aluminoborate glasses subject to thermoradiation treatment","authors":"M. K. Salakhitdinova, E. M. Ibragimova, O. K. Kuvandikov","doi":"10.55959/msu0579-9392.78.2340502","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340502","url":null,"abstract":"The paper presents the results of investigations of the magnetic properties of glasses of the composition K2O · Al2O3 · B2O3 (KAB) with the addition of Fe2O3 2.0 and 3.0 wt.subjected to radiation treatment in 60∘C gamma field at dose rate of 236 R/s for 2 hours at room temperature and when samples are heated to 423 K. Both under radiation and thermoradiation exposure, the magnetic susceptibility of glasses follows the Curie–Weiss law at 4.2–200 K and slightly deviates from this dependence at 200–340 K. The weakly pronounced magnetic hysteresis with low coercive force was detected at low temperatures against the background of magnetization that depends almost linearly on the field. An analysis of data on the temperature and field dependences of magnetization in weak and strong fields, combined with data on structural and optical properties, indicates that mainly Fe2O3 nanoparticles in the uncompensated antiferromagnetic state are formed in glasses, as well as an insignificant amount of dissociated Fe and Fe3O4 ions.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136313521","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 light element activation in human blood during 20 MeV linac operating 20mev直线加速器工作时人体血液中轻元素活化的研究
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340701
M.V. Zheltonozhskaya, P.D. Remizov, M.V. Lenivkin, E.N. Lykova, A.P. Chernyaev, V.N. Iatsenko, O.V. Iatsenko
{"title":"Study of light element activation in human blood during 20 MeV linac operating","authors":"M.V. Zheltonozhskaya, P.D. Remizov, M.V. Lenivkin, E.N. Lykova, A.P. Chernyaev, V.N. Iatsenko, O.V. Iatsenko","doi":"10.55959/msu0579-9392.78.2340701","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340701","url":null,"abstract":"A series of experiments have been performed to study the activation of chemical macronutrients in human venous blood throughout radiation treatment with the 20 MeV linac. Some elements in the human blood can be activated as positron-emitting radionuclides by (𝛾, n)-reaction. We calculated the 11C, 13N, 15O, 30P, 34𝑚Cl, and 38K activities in irradiated human venous blood samples for the first time. As a result, we concluded that the main contribution to the dose from positron-emitting nuclides activated in human blood provides three nuclides: 15O, 34𝑚Cl, and 38K.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136313957","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
On one conjugate object in the symmetric tensor C*-category and the statistics of superselection sectors 对称张量C*范畴中的一个共轭对象及超选择扇区的统计
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340101
A.S. Sitdikov, A.S. Nikitin
{"title":"On one conjugate object in the symmetric tensor C*-category and the statistics of superselection sectors","authors":"A.S. Sitdikov, A.S. Nikitin","doi":"10.55959/msu0579-9392.78.2340101","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340101","url":null,"abstract":"In this work, a model of a symmetric tensor 𝐶*-category with conjugation is constructed for the dimension of the object 𝑑 = 3. It is proved that the constructed conjugate object of the category satisfies the conjugation equations. The classes of morphisms between objects of the modeled category are considered and studied, and the algebra of observables in the presence of such an conjugate object is introduced. As an application of the model, we consider the theory of quantum information transfer, where it is necessary to take into account the constraints associated with the superselection rules.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136263396","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
Theoretical study of resonant charge exchange between H−ion and adsorbate-covered metal surface Cu(111)/Cu(110) with adsorbates Li+/Na+ 吸附Li+/Na+的金属表面Cu(111)/Cu(110)与H -离子共振电荷交换的理论研究
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340504
J.A. Melkozerova, I.K. Gainullin
{"title":"Theoretical study of resonant charge exchange between H−ion and adsorbate-covered metal surface Cu(111)/Cu(110) with adsorbates Li+/Na+","authors":"J.A. Melkozerova, I.K. Gainullin","doi":"10.55959/msu0579-9392.78.2340504","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340504","url":null,"abstract":"The influence of the surface type on resonant charge exchange between H−ion with a metal surfaces Cu(111) and Cu(110) covered by adsorbate Li+/Na+has been studied. A model static problem was considered. For modeling, athree-dimensional realization of the wave-packet propagation method was used. The Cu(110) andCu(111) surfaces were described by a pseudopotential, derived from a density functional theory (DFT).An occupation of H− ion, an electron density dynamics and an ion level width were analyzed. As aresult, we obtained that an electron oscillates more in case of the surface Cu(111). Furthermore, the resonant charge exchange is more efficient for Cu(111) surface.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136309304","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
Influence of dispersion on dynamics of the anti-Stokes broadening of the femtosecond pulse spectrum during filamentation in fused silica 熔融二氧化硅成丝过程中色散对飞秒脉冲谱反斯托克斯展宽动力学的影响
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340403
I. Y. Geints, E. D. Zaloznaya, A. E. Dormidonov, V. P. Kandidov
{"title":"Influence of dispersion on dynamics of the anti-Stokes broadening of the femtosecond pulse spectrum during filamentation in fused silica","authors":"I. Y. Geints, E. D. Zaloznaya, A. E. Dormidonov, V. P. Kandidov","doi":"10.55959/msu0579-9392.78.2340403","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340403","url":null,"abstract":"Numerical simulation methods are used to study the spectral transformation of a femtosecond wave packet during filamentation in fused silica under conditions of normal, zero, and anomalous group velocity dispersion. It is shown that during plasma generation that causes phase modulation of the light field, a rapid anti-Stokes broadening of the spectrum occurs. It was established that the short-wavelength shift of the broadband supercontinuum spectrum is much larger in case of anomalous group velocity dispersion than in case of normal and zero dispersion. The influence of the wave packet energy on the spectrum broadening dynamics is considered. Estimates of the numerical scheme parameters are obtained based on the dispersion analysis of the process of broadband supercontinuum propagation in a medium.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136310718","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
Creation of photonic crystal structures with arbitrary spectral features 创造具有任意光谱特征的光子晶体结构
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340401
S.E. Svyakhovskiy, N.I. Pyshkov
{"title":"Creation of photonic crystal structures with arbitrary spectral features","authors":"S.E. Svyakhovskiy, N.I. Pyshkov","doi":"10.55959/msu0579-9392.78.2340401","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340401","url":null,"abstract":"We present a method of creation of photonic structures whose optical spectrum of the reflection coefficient has an arbitrary shape and has predetermined features. We develop an algorithm for the construction of a photonic crystal structure, perform numerical simulation of its reflection spectra, and create an experimental sample of a photonic crystal that has a spectral response corresponding to a given shape.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136312731","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
Pattern analysis of fractal-like systems 分形系统的模式分析
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340406
Yu.V. Ryzhikova, S.B. Ryzhikov
{"title":"Pattern analysis of fractal-like systems","authors":"Yu.V. Ryzhikova, S.B. Ryzhikov","doi":"10.55959/msu0579-9392.78.2340406","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340406","url":null,"abstract":"The features of the Fourier spectra of fractal-like systems are studied. On the basis of theoretical studies, the features of the scaling invariants of the objects under consideration in light fields are determined, which manifest themselves in the form of stable local formations — patterns. Particular attention is paid to the problem of stability of the ratios of the scaling characteristics of the analyzed systems and their Fourier transforms. The possibility of identifying and systematizing various fractal systems based on the estimation of their scaling parameters is considered. An analysis of the stability of the scaling parameters of the probing radiation to changes in the parameters of the systems under study indicates that the pattern approach to improving the methods of optical diagnostics is promising.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136310951","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
How the Hubble flow in an anisotropic Universe looks like? 各向异性宇宙中的哈勃流是什么样的?
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340801
A.V. Toporensky, I.V. Stepanyan, R.V. Ivanov
{"title":"How the Hubble flow in an anisotropic Universe looks like?","authors":"A.V. Toporensky, I.V. Stepanyan, R.V. Ivanov","doi":"10.55959/msu0579-9392.78.2340801","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340801","url":null,"abstract":"Using formulae for light propagation, redshift and photometric distance in a Bianchi I anisotropic Universe, we create a picture of the Hubble flow that could be observed by a hypothetical observer in the anisotropic Universe. The algorithm used can be applied (after some modification) for more complicated visualizations of a sky seen by an observer in strong gravitational fields.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136265689","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
Monitoring of methane bubble emission and hydrological parameters in Laspi Bay (Crimea) 克里米亚拉斯皮湾甲烷气泡排放及水文参数监测
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340901
A.A. Budnikov, I.N. Ivanova, A.I. Khurchak, T.V. Malakhova
{"title":"Monitoring of methane bubble emission and hydrological parameters in Laspi Bay (Crimea)","authors":"A.A. Budnikov, I.N. Ivanova, A.I. Khurchak, T.V. Malakhova","doi":"10.55959/msu0579-9392.78.2340901","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340901","url":null,"abstract":"This work is devoted to studies of the shallow methane seepages temporal variability in the coastal area of Laspi Bay and high-frequency monitoring of the hydrological parameters daily dynamics in this area. The paper presents results obtained during the summer months of 2016, 2018-2021, and early February 2023. Using the passive acoustic method, it is shown that the intensity and periodicity of bubble gas emission by individual point sources can vary during the day and from season to season. It was obtained that a decreased content of dissolved oxygen and its saturation is observed above the active site of the seepages as compared to the distant (background) site. Moments of sharp decrease in oxygen content not accompanied by changes in temperature and other hydrological parameters were noted.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136265673","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
Tunneling spectroscopy of slightly overdoped pnictides BaFe1.88Ni0.12As2 in the superconducting and normal state 超掺杂微晶BaFe1.88Ni0.12As2在超导和正常状态下的隧穿光谱
Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-09-20 DOI: 10.55959/msu0579-9392.78.2340501
I. A. Nikitchenkov, A. D. Ilina, V. M. Mikhailov, K. S. Pervakov, V. A. Vlasenko, S. A. Kuzmichev, T. E. Kuzmicheva
{"title":"Tunneling spectroscopy of slightly overdoped pnictides BaFe1.88Ni0.12As2 in the superconducting and normal state","authors":"I. A. Nikitchenkov, A. D. Ilina, V. M. Mikhailov, K. S. Pervakov, V. A. Vlasenko, S. A. Kuzmichev, T. E. Kuzmicheva","doi":"10.55959/msu0579-9392.78.2340501","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2340501","url":null,"abstract":"Using tunneling spectroscopy, we measured current-voltage characteristics (CVC) and dynamic conductance spectra 𝑑𝐼(𝑉 )/𝑑𝑉 of tunneling contacts in single crystals of slightly overdoped superconducting ferro-pnictide of nominal composition BaFe1.88Ni0.12As2 with bulk critical temperature 𝑇𝑐 = 16−18 K. Besides the Andreev structure, a strong nonlinearity is observed in the obtained curves both in the superconducting and normal state. For the temperature range 4.3 − 26.4 K we determined the positions and temperature dependences of the observed features irrelated to the superconducting state. Additionally, we discuss the possible origins for the appearance of the observed features.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136309108","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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