Vol. 81, No. 2, 2026

Moscow University Physics Bulletin

Activation Functions for Deep Learning Based on Generalised Entropies

R. A. Rudamenko, A. M. Savchenko, and K. M. Semenov p. 225 abstract

Correlations of Neutron Star Characteristics with Properties of Nucleon and Hyperon Interactions

A. I. Nasakin, D. E. Lanskoy, S. A. Mikheev, A. M. Potokin, and T. Yu. Tretyakova p. 236 abstract

Wave Function and \(\boldsymbol{S}\)-Factor of the Nucleon in the Quark–Diquark Model with Chromodynamic Interaction

Yu. D. Chernichenko p. 259 abstract

Modelling of the SPD End-Cap Tracker

V. A. Kuzmin p. 277 abstract

Neural-Network Modeling of Observables in Single-Pion Electroproduction Reactions on the Proton in the Resonance Region

A. V. Golda, A. A. Rusova, E. L. Isupov, and V. V. Chistyakova p. 286 abstract

Study of Optical Properties of Nanostructured Germanium after Cluster Ion Bombardment

I. V. Nikolaev, I. A. Azarov, and N. G. Korobeishchikov p. 297 abstract

Optical Simulator for Quantum Key Distribution

L. V. Biguaa and S. P. Kulik p. 303 abstract

Application of Machine Learning Methods for the Identification of Spin Centres in Metal Oxides

E. V. Kytina, A. V. Vasiliev, E. A. Konstantinova, and D. R. Khokhlov p. 317 abstract

Local Chemical Reactions Involving Fluorine Atoms on the Pt(111) Surface

D. A. Muzychenko, S. I. Oreshkin, M. N. Petukhov, M. A. Ardamin, M. Yu. Aleksandrov, V. I. Panov, and A. I. Oreshkin p. 326 abstract

Contribution of Inhomogeneous Magnetoelectric Interaction to the Static Boundary Condition for Magnetization

N. V. Myasnikov and A. P. Pyatakov p. 333 abstract

Observations of Astrophysical Transients and Exoplanet Transits with Small Telescopes of INASAN and the System for Their Automatic Planning

A. N. Tarasenkov p. 343 abstract

Sky Background Accounting in Spectral Infrared Observations of Extended Objects at the Caucasus Mountain Observatory of the SAI MSU

A. S. Gusev, A. M. Tatarnikov, S. G. Zheltoukhov, and M. S. Kirsanova p. 352 abstract

Stratification in Mean-Field Geodynamo Models

M. Yu. Reshetnyak p. 361 abstract

Morphological Methods for Estimating the Relative Delay of Infrasound Signals in the Form of N- and U-Waves

A. F. Idrisov, A. I. Chulichkov, and S. N. Kulichkov p. 367 abstract

Erratum to: Reconstruction of Energy of Ultrahigh-Energy Cosmic Rays Registered with a Fluorescence Telescope: One Time Frame Might Be Enough

M. Yu. Zotov and A. A. Trusov p. 374 abstract