Zobrazeno 1 - 10
of 8 439
pro vyhledávání: '"Tretyakov A"'
Publikováno v:
St. Petersburg Polytechnical University Journal: Physics and Mathematics, Vol 17, Iss 2 (2024)
The paper presents the results of experimental study of the influence of the doping agent (acid) nature on the conductivity, Seebeck coefficient, and thermoelectric power factor of composite material based on multilayer carbon nanotubes coated with p
Externí odkaz:
https://doaj.org/article/3adbaeb531ae4e1685eb35b8bc3b5d71
Publikováno v:
St. Petersburg Polytechnical University Journal: Physics and Mathematics, Vol 16, Iss 2 (2023)
The paper presents the results of an experimental study of the electric conductivity and thermoelectric properties of a new coordination polymer (CP) based on phenazine ligands (Phz) and silver (Ag) synthesized by a one-step method. This method produ
Externí odkaz:
https://doaj.org/article/1a6524e572fd46b8b939b6a54b88703f
We consider dynamics of a scalar field in compactification scenario of Einstein-Gauss-Bonnet cosmology. It is shown that if the field is non-minimally coupled to curvature, its asymptotic value under certain conditions may be shifted from the minimum
Externí odkaz:
http://arxiv.org/abs/2407.20409
In this study, we elaborate on the concept of scalable anomalous reflector (AR) to analyze the angular response, frequency response, and spatial scalability of a designed AR across a broad range of angles and frequencies. We utilize theoretical model
Externí odkaz:
http://arxiv.org/abs/2407.17279
Autor:
Tretyakov, M. V.
It is proposed to use stochastic differential equations with state-dependent switching rates (SDEwS) for sampling from finite mixture distributions. An Euler scheme with constant time step for SDEwS is considered. It is shown that the scheme converge
Externí odkaz:
http://arxiv.org/abs/2407.13389
Publikováno v:
St. Petersburg Polytechnical University Journal: Physics and Mathematics, Vol 15, Iss 3 (2022)
In the paper, the effect of temperature (range 22 – 140 °C) on the power factor (PF) of composite material made of multi-walled carbon nanotubes with a 10 nm thick polyaniline coating applied to their surface has been studied. The conductivity val
Externí odkaz:
https://doaj.org/article/0f850ce707eb4f3c8fbf3b621777704c
Publikováno v:
E3S Web of Conferences, Vol 383, p 01017 (2023)
The issues of measuring the coefficients of vertical and horizontal dynamics of a subway car during running dynamic tests are reviewed. The theoretical research of bogie frame loading by finite element method has been done. Analysis of complex calcul
Externí odkaz:
https://doaj.org/article/5f5477f433444b949cc0ca013efcc2d0
We derive and analyze numerical methods for weak approximation of underdamped (kinetic) Langevin dynamics in bounded domains. First-order methods are based on an Euler-type scheme interlaced with collisions with the boundary. To achieve second order,
Externí odkaz:
http://arxiv.org/abs/2404.16584
In this paper, we present a general theory of aperiodic subwavelength arrays for controlling electromagnetic waves. The considered platform is formed by an array of electrically small loaded scatterers above a ground plane. While the array is geometr
Externí odkaz:
http://arxiv.org/abs/2404.07608
Autor:
Hao, Le, Vuyyuru, Sravan K. R., Tretyakov, Sergei A., Salihu, Artan, Rupp, Markus, Valkonen, Risto
In this paper, we systematically study the electromagnetic (EM) and communication aspects of an RIS through EM simulations, system-level and ray-tracing simulations, and finally measurements. We simulate a nearly perfect, lossless RIS, and a realisti
Externí odkaz:
http://arxiv.org/abs/2403.13210