Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Oana Constantinescu"'
Formal Integrability for the Nonautonomous Case of the Inverse Problem of the Calculus of Variations
Autor:
Oana Constantinescu
Publikováno v:
Symmetry, Integrability and Geometry: Methods and Applications, Vol 8, p 059 (2012)
We address the integrability conditions of the inverse problem of the calculus of variations for time-dependent SODE using the Spencer version of the Cartan-Kähler theorem. We consider a linear partial differential operator P given by the two Helmho
Externí odkaz:
https://doaj.org/article/7b45f767d07a436095765e80dce9ae59
Publikováno v:
EMERG - Energy. Environment. Efficiency. Resources. Globalization. 7:129-140
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12b715ace621224b2d33f52b00625646
https://doi.org/10.37410/emerg.2021.2.11
https://doi.org/10.37410/emerg.2021.2.11
We prove that in a Finsler manifold with vanishing $\chi$-curvature (in particular with constant flag curvature) some non-Riemannian geometric structures are geodesically invariant and hence they induce a set of non-Riemannian first integrals. Two al
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b2a9c5ba8506358ed0b5b43f4352050b
http://arxiv.org/abs/2204.05678
http://arxiv.org/abs/2204.05678
Publikováno v:
Romanian Journal of Neurology, Vol 9, Iss 3, Pp 118-123 (2010)
A major cause of disability after stroke is impaired contralateral manual dexterity. Recently it has been suggested that this may be at least partly due to a maladaptive increase in inhibition from the unaffected primary motor cortex (M1). Transcran
Externí odkaz:
https://doaj.org/article/03ac01b284724eae854e4ce419e58398
Autor:
Cristian Gheorghiu, Stefan Gheorghe, Ioan Bitir-Istrate, Miruna Gheorghiu, Alexandra Gabriela Dobrica, Oana Constantinescu, Mircea Scripcariu
Publikováno v:
2021 10th International Conference on ENERGY and ENVIRONMENT (CIEM).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::112619433555b88740c8b34743ee7d7a
https://doi.org/10.1109/ciem52821.2021.9614791
https://doi.org/10.1109/ciem52821.2021.9614791
We use two non-Riemannian curvature tensors, the χ-curvature and the mean Berwald curvature to characterise a class of Finsler metrics admitting first integrals. This class includes Finsler metrics of constant flag curvature.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e48c688d6d94f0daf1ee0b941cfc945
http://arxiv.org/abs/2101.11876
http://arxiv.org/abs/2101.11876
Publikováno v:
European Neurology, Vol. 78, No 1-2 (2017) pp. 105-110
Objective: Evaluation for surgical treatment is offered to patients who do not respond to antiepileptic drugs. Pseudo-pharmacoresistance (PPR) has been described in the context of impaired compliance, incorrect diagnosis of epilepsy or pharmacologica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df776582e468f793eb739cd389f1020c
https://doi.org/10.1159/000479003
https://doi.org/10.1159/000479003
Autor:
Ebtsam H. Taha, Oana Constantinescu
Publikováno v:
International Journal of Geometric Methods in Modern Physics. 17:2050050
We study non-conservative like SODEs admitting explicit Lagrangian descriptions. Such systems are equivalent to the system of Lagrange equations of some Lagrangian $L$, including a covariant force field which represents non-conservative forces. We fi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::441e3cda3f0c0855b2e1236e727ce642
https://doi.org/10.1142/s0219887820500504
https://doi.org/10.1142/s0219887820500504
Autor:
Oana Constantinescu
Publikováno v:
Journal of the Korean Mathematical Society. 45:1443-1482
In this paper we define a Myller configuration in a Finsler space and use some special configurations to obtain results about Finsler subspaces. Let F n =(M, F ) be a Finsler space, with M a real, differentiable manifold of dimension n. Using the pul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::173c8fe101750bdc89a1f5cb56d9d4b1
https://doi.org/10.4134/jkms.2008.45.5.1443
https://doi.org/10.4134/jkms.2008.45.5.1443
Autor:
Oana Constantinescu, Ioan Bucataru
In this paper we provide generalized Helmholtz conditions, in terms of a semi-basic 1-form, which characterize when a given system of second order ordinary differential equations is equivalent to the Lagrange equations, for some given arbitrary non-c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c2d8d2acb54954602355e22f71fcea9b