{"title":"Experimental study of the interaction of wind with a wave induced by a wave producer in a direct channel","authors":"I. N. Ivanova, O. N. Melnikova","doi":"10.55959/msu0579-9392.78.2360902","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360902","url":null,"abstract":"An experimental study of the effect of wind blowing a wave induced by a wave generator in a direct channel has been carried out. It is shown that at low wave steepness 𝑎𝑘 < 0.1 and wind speed 𝑊 < 2.3 m/s, a drift current occurs on the water surface due to the influence of viscous forces. A formula for calculating its velocity is proposed. It is found that the phase velocity of the wave increases with the appearance of a drift flow and can be calculated using the formula obtained for linear waves on a flow with a constant velocity shift. With an increase in the steepness of the wave 𝑎𝑘 > 0.19 and an increase in wind 𝑊 > 2.3 m/s, the formation of a vortex deforming the water surface was detected in the air flow above the top of the wave crest. The vortex destroys the viscous layer, reducing the drift velocity. At the same time, the phase velocity and wavelength decrease. A mechanism explaining this process is proposed.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"357 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171839","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}
A. Tikhonravov, A. Lagutina, Y. S. Lagutin, D. V. Lukyanenko, S. Sharapova, A. N. Sharov, A. Yagola
{"title":"On the choice of monitoring procedure of optical coating deposition","authors":"A. Tikhonravov, A. Lagutina, Y. S. Lagutin, D. V. Lukyanenko, S. Sharapova, A. N. Sharov, A. Yagola","doi":"10.55959/msu0579-9392.78.2360105","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360105","url":null,"abstract":"Theoretical results are formulated to assess the strength of the effect of self-compensation of errors in the thicknesses of layers of multilayer optical coatings. They are applicable to any method of optical monitoring of the deposition process. It is shown that considering a possible presence of a strong error self-compensation effect is of great importance for choosing a monitoring method. A comparative analysis of the results obtained to date to assess the strength of the error self-compensation effect for various types of coatings has been carried out. Moreover, a number of results were obtained for the first time directly in this work. The results obtained can be used to select the optimal method for monitoring the deposition process depending on the type of coating.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"168 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171986","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}
{"title":"Reaction–diffusion systems with nonlinear sources of different intensity in the case of a multiple root without quasimonotonicity condition","authors":"R. Simakov","doi":"10.55959/msu0579-9392.78.2360102","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360102","url":null,"abstract":"We consider a boundary value problem for a singularly perturbed system of two second-order ordinary differential equations with different powers of a small parameter at the second derivatives without requiring the right-hand sides to be quasimonotonic. The specific feature of the problem is that one of the two equations in the degenerate system has a double root. It is proved that for sufficiently small values of a small parameter, the problem has a solution of the boundary layer type. A condition is obtained that replaces the quasimonotonicity condition and expands the class of problems to which the results of the work are applicable.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"43 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139172291","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}
{"title":"Elastic neutrino scattering on nucleons and neutrino electromagnetic properties","authors":"K. Kouzakov, F. M. Lazarev, A. Studenikin","doi":"10.55959/msu0579-9392.78.2360203","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360203","url":null,"abstract":"We study the electromagnetic contribution to elastic neutrino-nucleon scattering processes. The neutrino electromagnetic charge, magnetic, electric, and anapole form factors of both diagonal and transition types in the mass basis are taken into account in the present formalism. When treating the nucleon electromagnetic vertex, we take into account not only the charge and magnetic form factors of a nucleon, but also its electric and anapole form factors. We examine the effects of the neutrino magnetic moment on elastic neutrino-nucleon scattering and how they can be disentangled from those of the strange form factors contributions to the nucleon’s weak neutral current.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"35 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171170","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}
{"title":"Calculation of Phase Equilibria of Pure Light Hydrocarbons Using the PC-SAFT Equation of State and the Direct Energy Minimization Algorithm","authors":"A. V. Isaeva, M. O. Bevzo","doi":"10.55959/msu0579-9392.78.2360903","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360903","url":null,"abstract":"In the oil and gas industry, there is growing interest in using the PC-SAFT equation of state for predicting the phase behaviour and physical properties of hydrocarbons. This article demonstrates how this equation of state can be used in combination with the direct energy minimization algorithm of an isochoric-isothermal system for calculating vapour-liquid equilibrium parameters of hydrocarbons. The proposed approach is tested on four substances: methane, ethane, propane, and n-butane.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"235 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171381","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}
{"title":"Suppressing of even harmonics in free electron lasers by modifying the energy spread of the beam","authors":"K. Zhukovsky","doi":"10.55959/msu0579-9392.78.2360104","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360104","url":null,"abstract":"Using an analytical description of the evolution of the power of harmonics in free electron laser (FEL) undulators, we study the effect of electron beam parameters on the main characteristics of FEL radiation: the gain length, spectrum, and harmonic power. The possibility of suppressing even harmonics of the FEL as a light source in the study of materials and surfaces by analyzing the second harmonic nonlinear response (SHG) is being studied. The main factors influencing the radiation of even FEL harmonics are revealed; the influence of the beam cross section and the spread of electron energies on their radiation is analyzed. An example of a LEUTL FEL with visible light emission, which is used in studies of the optical properties of materials and the chemical state of molecules on surfaces and interfaces between media, is considered. In this context, the possibility of suppressing the second FEL harmonic is analyzed.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139172039","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}
{"title":"Influence of the Bound Electron-Hole Pairs Dissociation Probability Field Dependence Form on the Photocurrent and Spatial Resolution of Organic Field Phototransistors","authors":"V. A. Trukhanov","doi":"10.55959/msu0579-9392.78.2360401","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360401","url":null,"abstract":"In this work, numerical simulations are used to study ambipolar organic field-effect phototransistors, in which a spatially localized photoelectric effect can take place. This effect consists in the fact that there is a small spatially localized photosensitive region in the transistor channel, the position of which can be controlled by changing the gate voltage. The purpose of this work is to analyze the relationship between the form of the field dependence of the bound electron-hole pairs (𝑒/ℎ pairs) dissociation probability and characteristics of the studied ambipolar phototransistors such as normalized photocurrent, spatial resolution, and response time. It is shown that the optimal form of the field dependence of 𝑒/ℎ pairs dissociation probability is stepwise-like form, which can provide a high spatial resolution at high values of the normalized photocurrent without degrading the response time of the phototransistor. This shape can be achieved when the organic semiconductor has an extremely narrow distribution of 𝑒/ℎ pairs by size, described by the delta function. Also, on the example of several distributions of various shapes, it is shown that a decrease in the width of the distribution leads to an increase in the spatial resolution. Approaches to the selection and modification of organic semiconductor materials that would provide the most pronounced spatially localized photoelectric effect in ambipolar field-effect transistors are discussed.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"23 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171324","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}
{"title":"Seismotectonics of Russian segment of the Arctic","authors":"E. V. Voronina","doi":"10.55959/msu0579-9392.78.2360901","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360901","url":null,"abstract":"The paper considers the foci of the most severe earthquakes in the Russian segment of the Arctic that occurred during the entire observation period, from 1976 to the present. The stress and strain fields were studied by analyzing the tensor of the seismic moment of registered earthquakes. This analysis is being conducted for the first time. Spatial distributions of the Lode-Nadai coefficient and the rate of seismotectonic deformation are obtained.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"229 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171664","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}
G. E. Nikishev, N. Maslennikova, A. Tatarnikov, K. Y. Parusov, A. Belinski
{"title":"On the impact of «red leak» of filters on brightness estimates of late stars using the example of observations of rapid variability of symbiotic stars","authors":"G. E. Nikishev, N. Maslennikova, A. Tatarnikov, K. Y. Parusov, A. Belinski","doi":"10.55959/msu0579-9392.78.2360801","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2360801","url":null,"abstract":"The results of modeling the dependence of the «red leak» of photometric filters on various factors (color index 𝑉 −𝑅, luminosity class, interstellar reddening, air mass and PWV) during observations of stars are presented. The error arising from not taking into account the «red leak» in the case of filters used on the 0.6-m telescope of the CMO SAI can amount to 0.6 𝑚 − 0.8 𝑚 for late stars. Algorithms for reducing observational data are presented for filters 𝑈 and 𝐵. The results of observations of the rapid variability of two symbiotic stars CH Cyg and SU Lyn with cold components of very late spectral types are presented. For CH Cyg, rapid variability was detected on both observation dates. Taking into account the «red leak» effect, the amplitude in the 𝐵 band was 0.10𝑚 on November 6, 2019 and 0.19𝑚 on December 15, 2022, with a characteristic variability time of about 20 minutes. For SU Lyn, no rapid brightness variability was detected in the 𝐵 band on February 2, 2023 (with an accuracy of 0.003𝑚)","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"29 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139172252","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}
{"title":"Physical laboratory for students practical laboratory works of The Imperial Moscow University from the moment of foundation until 1917","authors":"A. A. Yakuta","doi":"10.55959/msu0579-9392.78.2361001","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2361001","url":null,"abstract":"The present survey, timed to a century and a half anniversary of practical laboratory works in Physics being introduced in the curriculum of The Imperial University of Moscow for the students of the Faculty of Physics, provides a broad coverage of its functioning in the period from 1873 to 1917. The author gives a brief overview of the history of its founding, includes the data concerning the development of its equipment infrastructure, stuffing and figures about the number of students who took physics labs in those years. The contents of practical laboratory works are being analysed. The author vividly shows that professor A. P. Sokolov’s “Guide to exercises in general physics labs of Physical Institute of The Imperial University of Moscow” relies heavily on “Guide to Practical Classes in Physics” by F. Kohlrausch. The author familiarizes the readers with some historical references, which enable to better enhance the readers’ understanding of the details of practical training of physics students in The Imperial University of Moscow at the end of the 19th and the beginning of the 20th century. The article also contains rare historical pictures, some of which are published for the first time.","PeriodicalId":399279,"journal":{"name":"Seriya 3: Fizika, Astronomiya","volume":"12 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139171348","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}