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August 18, 2026
HSE Scholar Presents Research on Postcards in Brazil and South Korea
Timur Khusyainov, Deputy Dean of theFaculty of Humanities atHSE University–Nizhny Novgorod, took part in two international conferences—the XVI World Congress of Rural Sociology in Porto Alegre, Brazil, and the 36th Annual Conference of the Alliance of Digital Humanities Organisations (DH2026) in Daejeon, South Korea. On his way to the conferences, the researcher also visited several other places, where he presented the experience of the Pochtovoe educational project.
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‘I Dream of Simple Things
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The Standard Model of Disc Accretion

Ch. 1. P. 1–106.
Lipunova G. V., Malanchev K., Shakura N. I.

Accretion discs are powerful energy factories in our Universe. They effectively transform the potential energy of gravitational interaction to emission, thereby unraveling the physics of distant objects. This is possible due to the presence of viscosity, driven by turbulent motions in accretion discs. In this chapter, we describe the equations for disc accretion in the framework of the standard model. We outline basic elements of the theory of turbulent viscosity and the emergence of the α-parameter. We further describe the radial and vertical structure of thin stationary accretion discs, and present analytical solutions to the basic equation of the evolution of a viscous accretion disc for both an infinite disc and for a disc in a binary system. Finally, we present a numerical method to solve the equations of disc evolution and vertical structure simultaneously.

Language: English
DOI
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Keywords: аккрецияaccretion

In book

Accretion Flows in Astrophysics
Accretion Flows in Astrophysics
Shakura N. I., Lipunova G. V., Malanchev K., Zhuravlev V. V., Razdoburdin D. N., Abolmasov P. K., Chashkina A., Postnov K., Kochetkova A. Y., Hjalmarsdotter L. Springer International Publishing, 2018.
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