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Akademický článek

Numerical and experimental study of the dynamic factor of the dynamic load on the urban railway

Autor: Anh Dung Tran, Van Tham Mai, Xuan Quy Do, The Truyen Tran, Van Ky Pham, Hai Ha Le

Publikováno v: Journal of the Mechanical Behavior of Materials, Vol 29, Iss 1, Pp 195-202 (2020)

This paper presents simulation calculations and experimental measurements to determine the dynamic load factor (DLF) of train on the urban railway in Vietnam. Simulation calculations are performed by SIMPACK software. Dynamic measurement experiments

Externí odkaz: https://doaj.org/article/086ae61221ba4eb7af41a6ddc60ae2d9

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Gravitational radiation of a spherically symmetric source in $f(R)$-gravitation

Autor: Van Ky, Pham, Van, Nguyen Thi Hong, Ky, Nguyen Anh

Publikováno v: Eur. Phys. J. C (2024) 84: 298

It is shown that Birkhoff's theorem for the general theory of relativity is overcome in the $f(R)$-theory of gravitation. That means, the $f(R)$-theory of gravitation, unlike Einstein's general theory of relativity, does not forbid gravitational radi

Externí odkaz: http://arxiv.org/abs/2404.10808

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Perturbative approach to $f(R)$-gravitation in FLRW cosmology

Autor: Van Ky, Pham, Van, Nguyen Thi Hong, Ky, Nguyen Anh

The $f(R)$ theory of gravitation developed perturbatively around the general theory of relativity with cosmological constant (the \text{$\Lambda$}CDM model) in a flat FLWR geometry is considered. As a result, a general explicit cosmological solution

Externí odkaz: http://arxiv.org/abs/2206.11259

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Akademický článek

The economic burden of malaria on the household in south-central Vietnam

Autor: Erhart Annette, Van Ky Pham, Thuan Le Khan, Hung Le Xuan, Xa Nguyen, Thang Ngo, Morel Chantal M, Mills Anne J, D'Alessandro Umberto

Publikováno v: Malaria Journal, Vol 7, Iss 1, p 166 (2008)

Abstract Background Each year, several thousand cases of malaria occur in south-central Vietnam. Evidence from elsewhere suggests that malaria can have an economic impact on the household as the illness prevents households from completing their norma

Externí odkaz: https://doaj.org/article/d12eff8435174cff90d460ec9611a1c7

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Testing the $f(R)$-theory of gravity

Autor: Ky, Nguyen Anh, Van Ky, Pham, Van, Nguyen Thi Hong

Publikováno v: Commun.Phys. 29 (2019) no.1, 35-46

A procedure of testing the $f(R)$-theory of gravity is discussed. The latter is an extension of the general theory of relativity (GR). In order this extended theory (in some variant) to be really confirmed as a more precise theory it must be tested.

Externí odkaz: http://arxiv.org/abs/1904.04013

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Perturbative solutions of the $f(R)$-theory of gravity in a central gravitational field and some applications

Autor: Ky, Nguyen Anh, Van Ky, Pham, Van, Nguyen Thi Hong

Publikováno v: Eur. Phys. J. C {\bf 78} (2018) no.7, 539

Exact solutions of an $ f(R) $-theory (of gravity) in a static central (gravitational) field have been studied in the literature quite well, but, to find and study exact solutions in the case of a non-static central field are not easy at all. There a

Externí odkaz: http://arxiv.org/abs/1807.04628

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