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13 July 2026
HSE Researchers Provide the World’s First Legal Definition of a Digital Ecosystem
Digital ecosystems have evolved from a technological innovation into a fundamental institution of the modern economy over the past few years. According to HSE University’s latest estimates, they account for 8.5% of Russia’s GDP. Previously, no jurisdiction had a statutory definition of what constitutes a digital ecosystem. HSE University researchers have addressed this gap by proposing the first legal concept of a digital ecosystem. Their article, ‘The Digital Ecosystem as a Novel Economic Phenomenon and Legal Concept,’ has been published in the BRICS Law Journal.
9 July 2026
When Looking at Their Own Faces, Men Forget Everything
In an experiment involving 15 healthy men, scientists at HSE University investigated how different phases of the cardiac cycle influence the excitability of the motor cortex when participants viewed either their own photograph or the faces of strangers. The researchers found that when participants looked at their own image, the brain’s response to signals from the heart was weaker, meaning that the influence of cardiac activity on the motor cortex decreased. This finding came contrary to expectations, as self-focused attention was thought to enhance the brain's sensitivity to internal bodily signals. The study has been published in Frontiers in Signal Processing.
7 July 2026
Scientists Model How Interactions Between Societies Can Trigger Chaotic Behaviour
Scientists at HSE MIEM have proposed a mathematical model explaining how interactions between societies can influence their stability. Based on the classical theory of evolutionary games, the study reveals an unexpected effect: even a weak informational influence of one society on another can cause one society to remain stable while the other exhibits chaotic behaviour among its individual members. The study has been published in the International Journal of Bifurcation and Chaos.

Book chapter

Experimental Analysis of the Electrodynamic Characteristics of the Coaxial-Radial Line Type Slow-Wave Structures and Its Modifications

P. 1-4.
Presnyakov S., Kasatkin A., Kravchenko N., Mukhin S.

In this paper, we experimentally analyze the electrodynamic characteristics of a slow-wave structure (SWS) of the coaxial-radial line (CRL) type. Such SWSs are widely used in high-power traveling-wave tubes (TWTs) provide high output powers due to good heat removal, but have the limited amplified frequency band. For analysis, the resonance method and the electron probe method are used. Based on the results of the study, the possibility of using SRL to build a multibeam broadband TWT is evaluated. The assumption that the dispersion characteristic of the zero harmonic of the fundamental passband of the CRL is practically parallel to the wavelength axis in a wide range was experimentally confirmed.

Language: English
Full text (DOC, 2.26 Mb)
DOI
Keywords: resonance methodelectron probe methodcoaxial-radial linesExperimental Studieselectrodynamic characteristics
Publication based on the results of: Исследование электродинамических параметров и характеристик частотно-селективных резонаторных структур на метаматериалах и замедляющих системах для устройств терагерцевой электроники, интернета вещей (IoT, IIoT) и киберфизических систем(2021)

In book

2022 Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO)
IEEE, 2022.
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Added: Oct 21, 2020
The Influence of Flexible Bending on the Electrodynamic Characteristics of RFID Tags
Yelizarov (Elizarov) A. A., Lavrukhin I. R., Bashkevich S. V. In bk.: 2020 Systems of signals generating and processing in the field of on board communications. IEEE, 2020. P. 1-4.

In this paper, we study the effect of the bending effect on the electrodynamic characteristics of the RFID tag. The simulation of RFID tags with a more complex topology was carried out. An antenna based on a circular meander line was taken as the basis of the tag and its reduced model was presented. The results of the study allow us to see the negative changes in the electrodynamic characteristics during flexible deformations. This will allow to take into account during design and production the features of the behavior of RFID tags during operation (transportation, wear, etc.) in order to increase the likelihood of reading tags under adverse operating conditions.

Added: May 5, 2020
Моделирование спиральной замедляющей системы мощной лампы бегущей волны
Азов Г. А., Хриткин С. А. Радиотехника и электроника. 2010. Т. 55. № 3. С. 369-373.

The electrodynamic characteristics of the helical slow-wave structure of a high-power pulse traveling-wave tube operating in the centimeter wavelength range are calculated by means of the solution of the dispersion equation and simulation. Special attention is focused on the effect of a helix wire profile on the electrodynamic characteristics of the system. The results of the theoretical study are compared with the experimental data.

Added: Apr 17, 2012
Моделирование выходных характеристик мощных спиральных ламп бегущей волны
Азов Г. А., Хриткин С. А. Радиотехника и электроника. 2012. Т. 57. № 6. С. 686-690.

A numerical simulator of the interaction processes in helical traveling-wave tubes is developed on the basis of the method of large particles in the 1D approximation with the use of the calculation methods developed previously. The output characteristics (frequency dependences of the output power and gain factor) of high-power traveling wave tubes based on helical slow-wave structures for operation in the C and Ku wave bands are studied theoretically and experimentally. It is shown that the results of numerical simulation are in satisfactory agreement with experimental data.

 

Added: Nov 21, 2012
Определение электродинамических характеристик замедляющих систем типа цепочки связанных резонаторов с пролетным каналом, заполненным плазмой
Кравченко Н. П., Мухин С. В. Измерительная техника. 2014. № 6. С. 51-54.

The developed model of cell slow-wave system type chains of linked resonators with adjacent channel filled with plasma, using the method of equivalent systems. This model represents the octal-pole, which is used for determination and calculation of electrodynamic characteristics. Calculations show that the introduction of plasma allows to extend the working width slow-wave system and increase the coupling impedance.

Added: Apr 9, 2014
Усиление электромагнитных волн миллиметрового диапазона с помощью замедляющих систем типа "петляющий волновод"
Кравченко Н. П., Мухин С. В., Пресняков С. А. В кн.: Тезисы докладов IX международной отраслевой научной конференции “Технологии информационного общества”. М.: ИД Медиа Паблишер, 2015. С. 83-83.

This paper considers the model of amplification of electromagnetic millimeter waves by non-relativistic electron beams in one-dimensional periodic electrodynamic systems. As slow-wave structures are investigated systems such as “winding waveguide” and “counter-pins”-type suitable for use in the millimeter range. The main directions of research are: -  development of a traveling-wave tube model on the basis of the differential theory of excitation of electrodynamic systems by currents; -  modeling and calculation for simplified waveguide-resonator model of electrodynamic properties of slow-wave structures such as "winding waveguide" in the millimeter range; -  representation of a waveguide-resonator model of "winding waveguide"-type  slow-wave structure, composed of segments of rectangular and U-shaped waveguide; -  obtaining by a waveguide-resonator model coefficients of the transmission matrix, which allows to analyze the dispersion and coupling impedance in the band of amplified frequencies; -  investigation of “winding waveguide"-type  slow-wave structure taking into account the geometric phase rotation field in neighboring gaps by linear waveguide-resonator model represented by a chain of quadripoles by means of opposite switching of the induced current in the neighboring interaction gaps  and also the first spatial harmonic used in traveling-wave tubes for the calculation of the dispersion; -  calculation of a number of options that characterize the basic laws of changes in the properties of “winding waveguide"-type  slow-wave structure; -  modeling the properties of slow-wave structures such as "winding waveguide" using 3D-codes; -  application of the results obtained using the 3D-codes as the numerical experiment to adjust waveguide-resonator model; -  model building pin-type slow-wave structures using waveguide-resonator model, customized by experimental reference points. The paper shows that for modeling slow-wave structures such as “winding waveguide” and “counter-pins” waveguide-resonator model customized to the experimentally obtained reference points can be used. As the reference points can also be used the values of deceleration and the coupling impedance obtained by numerical experiment using HFSS. Waveguide resonator models constructed in such way are sufficiently accurate and simple. This paper shows that these models can be successfully used for the calculation of traveling-wave tubes operating in the millimeter range.

Added: Oct 2, 2015
Simulation Analysis of Interaction in O-Type Devices with CRL Type Slow-Wave Structures
Kravchenko N., Kasatkin A., Presnyakov S. et al. In bk.: 2021 Systems of signals generating and processing in the field of on board communications. IEEE, 2021. P. 1-4.

This paper discusses the modeling of the process of interaction in traveling-wave tubes (TWTs) based on 'coaxial-radial line'-type (CRL-type) slow-wave structures (SWSs). One of the most important tasks while designing TWTs is to achieve high output power over wide range of frequencies. The aim of this paper is to try to solve this problem by combining the broad passband which is exhibited by spiral SWSs and good heat dissipation of 'chain of coupled cavities' -type SWSs. As a result of this work, an algorithm for calculating the characteristics of transparent multi-beam TWT based on the SWS of the CRL-type and a method for designing TWT data have been developed. The calculation of transparent TWT was carried out. The calculation results show that in such TWT the problem of obtaining high power in combination with good heat dissipation can be solved. In addition, the developed program allows designing both transparent and sectioned TWTs.

Added: Sep 23, 2021