Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Armin Hatefi"'
Autor:
Armin Hatefi, Ehsan Hatefi
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 11, Pp 1-17 (2023)
Abstract This paper investigates the self-similar solutions of the Einstein-axion-dilaton configuration from type IIB string theory and the global SL(2,R) symmetry. We consider the Continuous Self Similarity (CSS), where the scale transformation is c
Externí odkaz:
https://doaj.org/article/99f9dde10a74402bab146851cac15b07
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 10, Pp 1-23 (2023)
Abstract In this paper, we study the black hole solution of self-similar gravitational collapse in the Einstein-axion-dilaton system for the elliptic class in four dimensions. The solution is invariant under space-time dilation, which is combined wit
Externí odkaz:
https://doaj.org/article/53df2f5454d442af9507b1c4fb00bc01
Autor:
Amirhossein Alvandi, Armin Hatefi
Publikováno v:
Stats, Vol 6, Iss 3, Pp 812-838 (2023)
In surveys requiring cost efficiency, such as medical research, measuring the variable of interest (e.g., disease status) is expensive and/or time-consuming; however, we often have access to easily obtainable characteristics about sampling units. The
Externí odkaz:
https://doaj.org/article/4c66e21e19f24d909a85ebc829cdb698
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 7, Pp 1-17 (2023)
Abstract In this paper, we introduce a numerical method based on Artificial Neural Networks (ANNs) for the analysis of black hole solutions to the Einstein-axion-dilaton system in a high dimensional parabolic class. Leveraging a profile root-finding
Externí odkaz:
https://doaj.org/article/1b02bd627c0e4b8095fab877dd2995d8
Autor:
Ehsan Hatefi, Armin Hatefi
Publikováno v:
Mathematics, Vol 10, Iss 23, p 4537 (2022)
The self-similar gravitational collapse solutions to the Einstein-axion–dilaton system have already been discovered. Those solutions become invariants after combining the spacetime dilation with the transformations of internal SL(2, R). We apply no
Externí odkaz:
https://doaj.org/article/1907d2b4bb884c1e8c0de5806029f878
Autor:
Amirhossein Alvandi, Armin Hatefi
Publikováno v:
Statistical Methods in Medical Research. 30:1960-1975
In many surveys, we often deal with situations where measuring the study variable is expensive; however, there are easy-to-measure characteristics which can be used as ranking information to obtain more representative samples from the population. Ran
Autor:
Armin Hatefi, Ehsan Hatefi
This paper focuses on self-similar gravitational collapse solutions of the Einstein--axion-dilaton configuration for two conjugacy classes of SL(2, R) transformations. These solutions are invariant under spacetime dilation, combined with internal tra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c2a5eb9f228c438a416762a34878c8c
Autor:
Armin Hatefi, Amirhossein Alvandi
Publikováno v:
J Appl Stat
Ranked set sampling (RSS) design as a cost-effective sampling is a powerful tool in situations where measuring the variable of interest is costly and time-consuming; however, ranking information about sampling units can be obtained easily through ine
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5d3de990bcd77ef42c06a6a627eec5b
https://europepmc.org/articles/PMC9041723/
https://europepmc.org/articles/PMC9041723/
Publikováno v:
Statistica Sinica.
Autor:
Armin Hatefi, Mohammad Jafari Jozani
Publikováno v:
AStA Advances in Statistical Analysis. 101:117-149
Partially rank-ordered set (PROS) sampling is a generalization of ranked set sampling in which rankers are not required to fully rank the sampling units in each set, hence having more flexibility to perform the necessary judgemental ranking process.