Zobrazeno 1 - 10
of 840
pro vyhledávání: '"A. P. Tonchev"'
We derive exact results for the critical Casimir force (CCF) within the one-dimensional Ising model with periodic boundary conditions (PBC's) and long-range equivalent-neighbor ferromagnetic interactions of strength $J_{l}/N>0$ superimposed on the ne
Externí odkaz:
http://arxiv.org/abs/2404.18324
Autor:
Dantchev, Daniel, Tonchev, Nicholay
Fluctuations exist in any material object $A$. If $A$ has non-zero temperature $T$, one speaks about thermal fluctuations. If $A$ is at very low $T$, the fluctuations are of quantum origin. Interesting effects appear if two bodies $A$ and $B$ are sep
Externí odkaz:
http://arxiv.org/abs/2403.17109
Autor:
Rukavina, Sanja, Tonchev, Vladimir D.
The parameters 2-(36,15,6) are the smallest parameters of symmetric designs for which a complete classification up to isomorphism is yet unknown. Bouyukliev, Fack and Winne classified all 2-$(36,15,6)$ designs that admit an automorphism of odd prime
Externí odkaz:
http://arxiv.org/abs/2403.03381
A maximal arc of degree k in a finite projective plane P of order q = ks is a set of (q-s+1)k points that meets every line of P in either k or 0 points. The collection of the nonempty intersections of a maximal arc with the lines of P is a resolvable
Externí odkaz:
http://arxiv.org/abs/2403.03189
Publikováno v:
Annals of Physics 464 (2024) 169647
Attention in the literature has increasingly turned to the issue of the dependence on ensemble and boundary conditions of fluctuation-induced forces. We have recently investigated this problem in the one-dimensional Ising model with periodic and anti
Externí odkaz:
http://arxiv.org/abs/2402.04459
New examples of self-dual near-extremal ternary codes of length 48 derived from 2-(47,23,11) designs
Autor:
Rukavina, Sanja, Tonchev, Vladimir D.
In a recent paper [M. Araya, M. Harada, Some restrictions on the weight enumerators of near-extremal ternary self-dual codes and quaternary Hermitian self-dual codes, Des. Codes Cryptogr., 91 (2023), 1813--1843], Araya and Harada gave examples of sel
Externí odkaz:
http://arxiv.org/abs/2310.18796
Publikováno v:
Annals of Physics 459 (2023) 169533
Recently, attention has turned to the issue of the ensemble dependence of fluctuation induced forces. As a noteworthy example, in $O(n)$ systems the statistical mechanics underlying such forces can be shown to differ in the constant $\vec{M}$ magneti
Externí odkaz:
http://arxiv.org/abs/2308.09796
A family of $\omega$-circulant balanced weighing matrices with classical parameters is used for the construction of optimal constant weight codes over an alphabet of size $g+1$ and length $n=(q^m -1)/(q-1)$, where $q$ is an odd prime power, $m>1$, an
Externí odkaz:
http://arxiv.org/abs/2307.13662
A classification of Hadamard matrices of order $2p+2$ with an automorphism of order $p$ is given for $p=29$ and $31$. The ternary self-dual codes spanned by the newly found Hadamard matrices of order $60$ with an automorphism of order $29$ are comput
Externí odkaz:
http://arxiv.org/abs/2307.08983
Autor:
Mariya Sredkova, Cvetan Popov, Georgi Golemanov, Vladislav Nankov, Pencho Tonchev, Alexander Blazhev, Valeri Delcheva, Slavcho Tomov
Publikováno v:
Journal of IMAB, Vol 30, Iss 3, Pp 5710-5719 (2024)
Purpose: To describe age- and sex-related differences in COVID-19 symptoms in patients admitted to emergency departments during the four waves of the pandemic in Central Northern Bulgaria Materials and methods: Retrospective analysis of data collect
Externí odkaz:
https://doaj.org/article/06d1695ff8af45ac8b38cd770cceaa97