Moscow University Physics Bulletin最新文献

Temperature Changes in the Mesopause Region due to Climate Changes in Recent Decades (1960–2024) 近几十年气候变化导致的中流层温度变化（1960-2024年）

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701984

I. I. Mokhov, V. I. Perminov, I. A. Fomina

{"title":"Temperature Changes in the Mesopause Region due to Climate Changes in Recent Decades (1960–2024)","authors":"I. I. Mokhov, V. I. Perminov, I. A. Fomina","doi":"10.3103/S0027134924701984","DOIUrl":"10.3103/S0027134924701984","url":null,"abstract":"The results of an analysis of temperature variations in the mesopause region based on long-term measurements of hydroxyl airglow at the Zvenigorod Scientific Station of the Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences (ZSS IAP RAS) during 1960–2024 against the global-scale climate changes are presented. Along with temperature variations in the mesopause region, two versions of temperature variations in the mesopause region, normalized to the same level of solar activity, were analyzed. Quantitative estimates of a significant decrease in temperature in the mesopause region over the past decades in winter, against the background of global surface temperature increases, were obtained. Additionally, using cross-wavelet analysis of data for the time interval 1960–2024, significant coherence of their most long-term variations with the surface temperature in the Northern Hemisphere was noted, which had not been observed in data for shorter time intervals. The possibility of such coherence was predicted in (Mokhov et al., 2017) in the context of continued global warming based on the results of model simulations for the 20th–21st centuries, taking into account anthropogenic forcing, but it had not been observed in obsevational data for shorter time intervals. Along with long-term trends, notable features include a sharp temperature drop in the mesopause region during the 1970s and its synchronicity with the well-known shift in surface climate regimes associated with El Niño events. The results of cross-wavelet analysis using data obtained at ZSS IAP RAS for the time interval 1960–2024 indicate a more significant connection between temperature variations in the mesopause region and El Niño indices in recent decades.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"634 - 644"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995226","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

Dispersion- and Group Index Measurements in Dielectrics with Ultrashort Laser Pulses near the Bandgap Edge 带隙边缘附近超短激光脉冲介质色散和群指数的测量

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924702011

I. V. Savitsky, P. B. Glek, R. M. Aliev, E. A. Stepanov, A. A. Voronin, A. A. Lanin, A. B. Fedotov

引用次数: 0

Synthesis and Magnetic Properties of Magnetic Fluids Based on Co({}_{boldsymbol{x}})Ni({}_{boldsymbol{1-x}})Fe({}_{boldsymbol{2}})O({}_{boldsymbol{4}}) Nanoparticles Co ({}_{boldsymbol{x}}) Ni ({}_{boldsymbol{1-x}}) Fe ({}_{boldsymbol{2}}) O ({}_{boldsymbol{4}})纳米颗粒磁流体的合成及磁性能研究

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S002713492470187X

S. E. Kirgizov, K. O. Kuvandikov, D. Ph. Imamnazarov

{"title":"Synthesis and Magnetic Properties of Magnetic Fluids Based on Co({}_{boldsymbol{x}})Ni({}_{boldsymbol{1-x}})Fe({}_{boldsymbol{2}})O({}_{boldsymbol{4}}) Nanoparticles","authors":"S. E. Kirgizov, K. O. Kuvandikov, D. Ph. Imamnazarov","doi":"10.3103/S002713492470187X","DOIUrl":"10.3103/S002713492470187X","url":null,"abstract":"Magnetic nanoparticles Co({}_{x})Ni({}_{1-x})Fe({}_{2})O({}_{4}) with (x=0), (0.25), (0.5), (0.75) were synthesized by using the chemical coprecipitation method and magnetic fluids based on them were prepared. A structural and phase analysis of the obtained nanoparticles was performed, the characteristic sizes of nanoparticles and size dispersion, the magnetization of magnetic fluids containing a 0.5(%) volume concentration of magnetic nanoparticles were determined. Diffraction patterns of all compositions confirm the formation of a single-phase structure of cubic spinel NiFe({}_{2})O({}_{4}) and CoFe({}_{2})O({}_{4}). The average particle diameters determined using a transmission electron microscope are 17.22, 15.04, 14.69, 11.18 nm at (x=0), (0.25), (0.5), (0.75), respectively. The saturation magnetization of magnetic fluids based on Co({}_{x})Ni({}_{1-x})Fe({}_{2})O({}_{4}) nanoparticles decreases from 38.25 to 5.33 emu/kg as the cobalt concentration decreases from (x=0.75) to (x=0). For (x=0), (0.25), and (0.5), magnetic fluids are characterized by superparamagnetic properties, whereas for Co({}_{0.75})Ni({}_{0.25})Fe({}_{2})O({}_{4})-based fluids, a wide hysteresis loop with a coercive force H({}_{C}=612) Oe was observed, which is associated with the single-domain state of Co({}_{0.75})Ni({}_{0.25})Fe({}_{2})O({}_{4}) particles despite their small size.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"609 - 615"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995216","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

Development of an Electron Linac for Radiation Therapy. I. Suppression of Cathode Back-Bombardment Effect 放射治疗用电子直线加速器的研制。1、阴极反轰击效应的抑制

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701960

D. S. Yurov, M. A. Borisov, A. S. Alimov, A. N. Ermakov, A. N. Kamanin, N. I. Pakhomov, A. S. Simonov, Ya. Yu. Filippov, V. A. Khankin, V. I. Shvedunov, I. V. Shvedunov, N. V. Shvedunov

引用次数: 0

Optical Diagnostics of Fractal Biostructures 分形生物结构的光学诊断

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701923

Yu. V. Ryzhikova, S. B. Ryzhikov

引用次数: 0

Influence of Annealing on Magneto-Optical Properties of Fe({}_{mathbf{72.4}})Ti({}_{mathbf{5.4}})B({}_{mathbf{19.2}})O({}_{mathbf{3.0}}) Nanocrystalline Films 退火对Fe ({}_{mathbf{72.4}}) Ti ({}_{mathbf{5.4}}) B ({}_{mathbf{19.2}}) O ({}_{mathbf{3.0}})纳米晶薄膜磁光性能的影响

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701935

N. N. Perova, E. A. Ganshina, I. M. Pripechenkov, D. M. Gridin, E. V. Harin, V. A. Tejetov, E. N. Sheftel, A. B. Granovsky

{"title":"Influence of Annealing on Magneto-Optical Properties of Fe({}_{mathbf{72.4}})Ti({}_{mathbf{5.4}})B({}_{mathbf{19.2}})O({}_{mathbf{3.0}}) Nanocrystalline Films","authors":"N. N. Perova, E. A. Ganshina, I. M. Pripechenkov, D. M. Gridin, E. V. Harin, V. A. Tejetov, E. N. Sheftel, A. B. Granovsky","doi":"10.3103/S0027134924701935","DOIUrl":"10.3103/S0027134924701935","url":null,"abstract":"The results of the study on the magnetic properties of Fe({}_{72.4})Ti({}_{5.4})B({}_{19.2})O({}_{3.0}) nanocrystalline films, subjected to annealing in vacuum at 200, 300, and 400({}^{circ})C, are presented. Films with a mixed (nanocrystalline (+) amorphous) structure, 0.52 (mu)m thick, were obtained by magnetron deposition on glass substrates. Hysteresis loops were measured using a vibrating magnetometer, and the field and spectral dependences of the transverse Kerr effect (TKE) were determined. Magnetization reversal processes were visualized using a magneto-optical Kerr magnetometer. It was shown that the processes of partial crystallization of the initially amorphous phase and the redistribution of Ti and B within crystalline grains and grain boundaries, leading to the formation of new phases as a result of annealing, manifest themselves in a two-stage magnetization reversal process and in the modification of the TKE spectra.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"616 - 620"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995219","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

Low Temperature Transport in Solid Solutions of Bismuth-Antimony Tellurides with Arsenic, Copper, and Tin 铋锑碲化物与砷、铜、锡固溶体的低温输运

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701959

V. A. Kulbachinskii, A. S. Apreleva, V. G. Kytin, A. V. Koshelev

{"title":"Low Temperature Transport in Solid Solutions of Bismuth-Antimony Tellurides with Arsenic, Copper, and Tin","authors":"V. A. Kulbachinskii, A. S. Apreleva, V. G. Kytin, A. V. Koshelev","doi":"10.3103/S0027134924701959","DOIUrl":"10.3103/S0027134924701959","url":null,"abstract":"In this work, we have investigated the temperature dependences of the resistance (rho) (in the temperature range (4.2~textrm{K}<T<330) K) of single crystals of Bi({}_{2-x})As({}_{x})Te({}_{3}) ((0<x<0.034)), Sb({}_{2-x})Cu({}_{x})Te({}_{3}) ((0<x<0.1)), and Sb({}_{2-x})Sn({}_{x})Te({}_{3}) ((0<x<0.0075)), as well as the thermopower and thermal conductivity of solid solutions of Bi({}_{2-x})As({}_{x})Te({}_{3}) in the temperature range (77~textrm{K}<T<330) K. In the temperature range of 100–320 K, the dependence (rho(T)) follows a power law with an exponent (m=2) (Bi({}_{2-x})As({}_{x})Te({}_{3})), (m=1.2{-}1.1) (Sb({}_{2-x})Cu({}_{x})Te({}_{3})), and (m=1.2{-}0.6) (Sb({}_{2-x})Sn({}_{x})Te({}_{3})). For Bi({}_{2-x})As({}_{x})Te({}_{3}), it has been established that the conductivity decreases, while the Seebeck coefficient initially increases significantly and then decreases with increasing x. The thermal conductivity of samples with As decreases compared to the original bismuth telluride at (T<250) K. As a result, the maximum thermoelectric figure of merit ZT shifts from 300 to 250 K with increasing As content.","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"603 - 608"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994857","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

Tomography of Three-Layer Structures in Scanning Electron Microscopy in the Backscattered Electron Detection Mode 背散射电子检测模式下扫描电镜三层结构的层析成像

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701868

A. A. Borzunov, E. I. Rau, S. V. Zaitsev, N. A. Koshev, D. V. Lukyanenko, A. G. Yagola

引用次数: 0

On the Assembly of the Matrix in the Method of Moments and Its Implementation for Perfectly Conducting Bodies 矩量法中矩阵的装配及其在完美导电体中的实现

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701893

A. A. Vikulovskaia, D. A. Konyaev

引用次数: 0

Spacelike Motion inside a Closed Null Surface Generated by Abelian Electromagnetic Gauge Transformations 由阿贝尔电磁规范变换生成的封闭零曲面内的类空间运动

IF 0.4 4区物理与天体物理

Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924702023

Alcides Garat

引用次数: 0