Moscow University Physics Bulletin最新文献_第5页

Reproduction of Hydrothermodynamic Characteristics of the Western Arctic Seas of Russia with Assimilation of Sea Surface Temperature and Sea Ice Concentration Data 利用海面温度和海冰浓度同化资料再现俄罗斯北极西部海域的水热力特征

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700286

I. I. Panasenkova, V. V. Fomin, N. A. Diansky

{"title":"Reproduction of Hydrothermodynamic Characteristics of the Western Arctic Seas of Russia with Assimilation of Sea Surface Temperature and Sea Ice Concentration Data","authors":"I. I. Panasenkova, V. V. Fomin, N. A. Diansky","doi":"10.3103/S0027134925700286","DOIUrl":"10.3103/S0027134925700286","url":null,"abstract":"Reliable forecasting of meteorological, hydrothermodynamic, and ice characteristics in the waters of the Western Arctic Seas of Russia using atmospheric circulation, marine circulation, and sea ice models is currently impossible without observational data assimilation. Data assimilation improves the quality of the initial state of hydrophysical and ice characteristics in models for forecasting simulations, thereby enhancing their accuracy. This study presents a technique for assimilating satellite data on sea surface temperature (SST) and sea ice concentration (SIC) into the INMOM marine circulation model using the Data Assimilation Research Testbed (DART) software, with an assessment of the validity of the employed assimilation algorithm. A comparative analysis of the accuracy of hydrothermodynamic state forecasts with and without satellite SST and SIC data assimilation has been conducted. It is shown that assimilating satellite data reduce the root-mean-square deviation (RMSD) of 24-h forecast results from observational data by approximately 80(%) for SST and by 60–70(%) for SIC compared to the simulation without assimilation. The temporal variability of RMSD in SST and SIC forecasts indicates that the largest errors occur during periods of intense upper sea layer heating and ice melting. The importance of simultaneous assimilation of SST and SIC data is highlighted: more accurate SST reproduction improves the accuracy of heat and salt flux calculations at the ocean-ice boundary, which regulate the thermal accretion/melting processes of ice, consequently enhancing the reproduction of ice area and its edge. In turn, a more accurate SIC calculation directly improves the accuracy of heat flux calculations at the water–air boundary and, consequently, SST.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 2","pages":"379 - 388"},"PeriodicalIF":0.4,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165478","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

Measurement of the Power Output of the VVER-1000 Reactor Based on the Antineutrino Flux from the Core 基于堆芯反中微子通量的VVER-1000反应堆输出功率测量

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700365

A. V. Abramov, R. R. Alyev, M. B. Gromov, I. N. Zhutikov, S. M. Kiselev, A. V. Konstantinov, D. S. Kuznetsov, E. A. Litvinovich, I. N. Machulin, A. E. Murchenko, A. M. Nemeryuk, R. R. Nugmanov, A. Yu. Oralbaev, D. V. Popov, A. A. Rastimeshin, M. D. Skorokhvatov, M. A. Strizh, S. V. Sukhotin, V. A. Khvatov, A. S. Chepurnov, D. A. Chmykhalo, A. V. Etenko

引用次数: 0

Two Supernovae in NGC 4666: ASASSN-14lp and 2019yvr NGC 4666中的两颗超新星：ASASSN-14lp和2019yvr

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700389

D. Yu. Tsvetkov, N. N. Pavlyuk, N. P. Ikonnikova, M. A. Burlak, A. A. Belinskii, A. V. Dodin, S. A. Potanin, N. I. Shatsky, I. M. Volkov, P. V. Baklanov, M. G. Ushakova, V. A. Echeistov, V. M. Lipunov

{"title":"Two Supernovae in NGC 4666: ASASSN-14lp and 2019yvr","authors":"D. Yu. Tsvetkov, N. N. Pavlyuk, N. P. Ikonnikova, M. A. Burlak, A. A. Belinskii, A. V. Dodin, S. A. Potanin, N. I. Shatsky, I. M. Volkov, P. V. Baklanov, M. G. Ushakova, V. A. Echeistov, V. M. Lipunov","doi":"10.3103/S0027134925700389","DOIUrl":"10.3103/S0027134925700389","url":null,"abstract":"The results of photometric observations of two supernovae in NGC 4666, SN Ia ASASSN-14lp and SN Ib 2019yvr, as well as spectroscopic observations of SN 2019yvr, are presented. Light curves have been constructed, and their main parameters have been derived. Supernova ASASSN-14lp is a fairly typical Type Ia object with low rate of brightness decline and large interstellar extinction. Using the dependence of the maximum luminosity of SNe Ia on the light curve parameters, an estimate of the distance to the galaxy NGC 4666 has been obtained. The spectrum of SN 2019yvr near maximum light, its peak luminosity, and the shapes of the light curves during the first 90 days after maximum revealed characteristics of a typical Type Ib supernova, with interstellar extinction exceeding that of ASASSN-14lp. A decrease in the rate of brightness decline at a phase of approximately 90 days has been detected. Light curve modeling was performed using the STELLA code, and the physical parameters of the optimal model were determined. It is shown that the agreement between the model and observations breaks down after ({sim})40 days post-maximum; to explain this divergence, a model with an extra energy source due to the spin-down of the magnetar formed in the explosion has been proposed.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 2","pages":"358 - 369"},"PeriodicalIF":0.4,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165477","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

Amplitude Characteristics and Frequency Bias in a Zeeman Ring Laser under Three-Frequency Running Wave Excitation 三频行波激励下塞曼环形激光器的幅值特性和频率偏置

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700341

M. E. Grushin, E. G. Lariontsev, I. I. Savel’ev, E. V. Soukhov

{"title":"Amplitude Characteristics and Frequency Bias in a Zeeman Ring Laser under Three-Frequency Running Wave Excitation","authors":"M. E. Grushin, E. G. Lariontsev, I. I. Savel’ev, E. V. Soukhov","doi":"10.3103/S0027134925700341","DOIUrl":"10.3103/S0027134925700341","url":null,"abstract":"The characteristics of the Zeeman ring laser (ZRL) have been investigated theoretically and experimentally under conditions of two- and three-frequency generation. The influence of the running wave, excited at the third frequency, on the frequency bias and the intensities of counterpropagating waves is examined. A comparison of experimentally measured characteristics with calculations based on vector theory has been conducted. It has been found that when a running wave is excited in a neighbouring longitudinal mode, kinks appear in the dependence of counterpropagating wave intensities on the detuning of the generation frequency from the gain-line center. It is shown that excitation at the third frequency results in a stronger dependence of the frequency bias on the detuning from the gain-line center compared to the two-frequency generation regime. Based on the comparison of theory with experiment, it is demonstrated that among the known values of the isotopic shift between Ne({}^{20}) and Ne({}^{22}) at a wavelength of 0.63 (mu)m reported in the literature, the value (sigma=1050) MHz leads to results that do not agree with the experiment, allowing for a refinement of the parameter (sigma).","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 2","pages":"294 - 298"},"PeriodicalIF":0.4,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165250","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

Reconstruction of Photonic Crystal Structure from a Given Phase Response 从给定相位响应重构光子晶体结构

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700419

P. S. Emeliantsev, S. E. Svyakhovskiy

引用次数: 0

Detection and Estimation of the Slichter Mode (mathbf{{}_{1}S_{1}}) from Strain Data from the Baksan Laser Interferometer after the 2011 Tohoku Earthquake 2011年东北地震后巴克山激光干涉仪应变数据的切片模态(mathbf{{}_{1}S_{1}})探测与估计

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700237

M. P. Vinogradov, V. K. Milyukov, A. V. Myasnikov, A. F. Yanin

{"title":"Detection and Estimation of the Slichter Mode (mathbf{{}_{1}S_{1}}) from Strain Data from the Baksan Laser Interferometer after the 2011 Tohoku Earthquake","authors":"M. P. Vinogradov, V. K. Milyukov, A. V. Myasnikov, A. F. Yanin","doi":"10.3103/S0027134925700237","DOIUrl":"10.3103/S0027134925700237","url":null,"abstract":"The ({}_{1}textrm{S}_{1}) mode of the Earth’s free oscillations (Slichter mode) arises from the oscillations of the Earth’s inner solid core relative to the outer liquid core. This study conducts the search for and estimation of the Slichter mode following the 2011 Tohoku earthquake based on data from the Baksan laser interferometer–strainmeter. An algorithm based on the maximum likelihood method (MLM) was used to detect and estimate the mode parameters. The most probable estimates of the degenerate mode frequency and its splitting parameters have been obtained, which may be associated with the excitation of the Slichter mode in the analyzed data. An estimate of the density jump between the Earth’s inner and outer core has been derived for the found mode period. For the first time, a comparison has been made between the potential capabilities of the Baksan strainmeter and the superconducting gravimeters of the IGETS network for the task of observing the Slichter mode after the same earthquake. The similarity of the obtained mode estimate from strain observations with the previously obtained estimate from gravimetric observations, as well as with the theoretical value from the PREM model, is noted.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 2","pages":"370 - 378"},"PeriodicalIF":0.4,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165249","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

Numerical Model of Cosmic Ray Propagation in the Anisotropic Magnetic Field of the Galaxy 宇宙射线在银河系各向异性磁场中传播的数值模型

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700407

V. D. Borisov, V. O. Yurovsky, I. A. Kudryashov

引用次数: 0

Analysis of Cell Death and Proliferative Activity of Cell Cultures under Proton Irradiation in Flash Mode 闪光模式下质子辐照下细胞死亡及细胞增殖活性分析

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700353

V. V. Martynova, S. V. Akulinichev, I. A. Yakovlev

{"title":"Analysis of Cell Death and Proliferative Activity of Cell Cultures under Proton Irradiation in Flash Mode","authors":"V. V. Martynova, S. V. Akulinichev, I. A. Yakovlev","doi":"10.3103/S0027134925700353","DOIUrl":"10.3103/S0027134925700353","url":null,"abstract":"The study of the biological effects of accelerated protons with ultrahigh dose rates in and outside the Bragg peak on tumour and normal cell lines is essential for understanding the consequences of such exposure and for selecting optimal doses and modes for further application in tumour radiotherapy. In this study, human colorectal adenocarcinoma cells (HT-29) and normal human adipose-derived mesenchymal stem cells (ADSC)—fibroblasts—were irradiated. The irradiation was performed using the high-current linear proton accelerator at the Institute for Nuclear Research of the Russian Academy of Sciences, which allows for energy variation in the range of 70–230 MeV. The dose was delivered in three modes: conventional mode (dose rate (dot{D}<1) Gy/s), Splash mode ((dot{D}sim 100) Gy/s), and single-pulse Flash mode ((dot{D}>10^{4}) Gy/s, denoted as Splash from single-pulse Flash) in the region of the spread out Bragg peak. To analyze cell death, staining with propidium iodide and annexin was performed. The proliferative potential was assessed using the EdU assay. After 24 h, an increase in the number of apoptotic HT-29 cells was observed in all irradiation modes, while for fibroblasts, a relative increase in the number of necrotic cells was noted under conventional irradiation with a higher dose compared to other modes. After 48 h, a tendency toward a dose-dependent decrease in the number of necrotic HT-29 cells was observed in Flash/Splash modes, with consistently low levels of necrotic fibroblasts. The number of DNA-synthesizing cells decreased significantly by 120 h across all doses and irradiation modes. The curves for Flash and Splash irradiation modes were nearly parallel. Further studies involving a broader range of cell lines and doses are required.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 2","pages":"270 - 276"},"PeriodicalIF":0.4,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164573","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 Collagen-Induced Platelet Aggregation Using the Method of Low Angle Light Scattering 低角光散射法研究胶原诱导血小板聚集

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700390

G. S. Svidelskaya, E. N. Bruskova, A. A. Ignatova, A. A. Filkova, P. A. Zharkov, I. V. Mindukshev, S. P. Gambaryan, M. A. Panteleev

{"title":"Study of Collagen-Induced Platelet Aggregation Using the Method of Low Angle Light Scattering","authors":"G. S. Svidelskaya, E. N. Bruskova, A. A. Ignatova, A. A. Filkova, P. A. Zharkov, I. V. Mindukshev, S. P. Gambaryan, M. A. Panteleev","doi":"10.3103/S0027134925700390","DOIUrl":"10.3103/S0027134925700390","url":null,"abstract":"Assessment of platelet function is of key importance for the diagnosis of bleeding disorders and monitoring the effectiveness of antiplatelet drugs. Relatively recently, a method for assessing platelet aggregation based on the phenomenon of low angle light scattering was developed. Measurements are carried out in a medium with a known pH value and calcium concentration. The aim of this work was to investigate the influence of preanalytical and analytical variables, as well as to compare the results with the light transmission aggregometry method already widely used in clinical practice. It was found that transporting the sample by car for two hours does not affect the parameters of collagen-induced aggregation. It was discovered that the low angle light scattering method for measuring collagen-induced platelet aggregation exhibits good precision under repeatable conditions and is short-term reproducible. The aggregation parameters obtained by the low angle light scattering method directly correlate with the aggregation parameters measured by the transmission aggregometry method. The accelerating role of adenosine diphosphate secreted from dense granules in collagen-induced platelet aggregation was demonstrated.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 2","pages":"330 - 339"},"PeriodicalIF":0.4,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165480","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

Linear Approximation in the Two-Planet Problem with Arbitrary Orbital Inclinations. Evolution of the TOI-1130 Exosystem 任意轨道倾角双行星问题的线性逼近。TOI-1130系外系统的演化

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-07-13 DOI: 10.3103/S0027134925700328

B. P. Kondratyev, V. S. Kornoukhov, E. N. Kireeva

引用次数: 0