OLIVITRAN Nathalie
Organisme : CNRS
Chargé de Recherche
(HDR)
Nathalie.OliviTran
umontpellier.fr
0467144676
Bureau: 46.0, Etg: 3, Bât: 13  Site : Campus Triolet
Domaines de Recherche:  Physique/Matière Condensée/Science des matériaux
 Physique/Physique des Hautes Energies  Théorie
 Physique/Astrophysique/Cosmologie et astrophysique extragalactique [astroph.CO]
 Physique/Physique Quantique
 Physique/Relativité Générale et Cosmologie Quantique

Dernieres productions scientifiques :


A possible explanation of the nature of dark matter by Newtonian mechanics
Auteur(s): OliviTran N., Cannat M
(Document sans référence bibliographique) 20151116
Ref HAL: hal01230773_v1
DOI: 10.13140/RG.2.1.2035.1448
Exporter : BibTex  endNote
Résumé: We calculate the trajectory of a moving object on earth and the trajectory of the earth around the sun in a fourdimensional space (x, y, z, t). We see that the trajectory has a mass: this is what is called dark matter which mass depends on the mass of the moving object. Indeed the deformation of space, the track, deviates light as we are at the hypersurface of the universe, and that is the method of measurement of the 'mass' of the universe.




Fourdimensional Universe where Time is Taken as a Length, and Dark Energy
Auteur(s): OliviTran N.
Chapître d'ouvrage: Advances In Dark Energy Research, vol. p. (2015)
Ref HAL: hal01186613_v1
Exporter : BibTex  endNote
Résumé: This book addresses the latest advances in dark energy research, including addressing the problem with regard to both the origin of dark energy and the origin of dark matter; vacuum energy as the origin of accelerating expansion and issues which arise from such a hypothesis; born reciprocity and cosmic accelerations; cosmic acceleration for harmonic gravitational connections; showing time as a function of the cosmological comoving distance, using the FriedmannLemaitreRobertsonWalker model, the dark energy problem using a theory with a minimal length on the order of Plancks length; and a discussion on the kinematic aspects of the accelerated universe expansion process. (Imprint: Nova)



Progressively doping graphene with Si: from graphene to silicene, a numerical study
Auteur(s): OliviTran N.
(Article) Publié:
Applied Physics Research, vol. 7 p.1 (2015)
Ref HAL: hal01138887_v2
DOI: 10.5539/apr.v7n6p1
Exporter : BibTex  endNote
Résumé: For three different sizes of graphene nanosheets, we computed the Density of states when these nanosheets are progressively doped with an increasing percentage of Si atoms. The pure graphene nanosheets are semi conducting or not depending on their size. The pure silicene nanosheets are conducting with a conduction due to π electrons. The Si doped graphene nanosheets are also semi conducting or not depending on their size: for small sizes, there are semi conducting and they become conducting for larger sizes and larger percentages of Sidoping. We computed also the total electronic energy which is linked to the mechanical stability of all our nanosheets. This mechanical stability decreases regularly as a function of the Si percentage of doping , but for the pure silicene nanosheets, the mechanical stability decreases more abruptly.




The masses of the first family of fermions and of the Higgs boson are equal to integer powers of 2
Auteur(s): OliviTran N.
Conference: QCD14 (MONTPELLIER, FR, 20140630)
Actes de conférence: , vol. 258259 p.272275 (2015)
Ref HAL: hal01186623_v1
DOI: 10.1016/j.nuclphysbps.2015.01.057
Exporter : BibTex  endNote
Résumé: We noticed that the first family of fermions and the Higgs boson have masses which are equal to integer powers of 2 in eV/c 2 units (i.e. in the Planck length units). We made the hypothesis that, if spacetime is composed of small hypercubes of one Planck length edge, it exists elementary wavefunctions which are equal to √ 2 exp(ikx i) if it corresponds to a space dimension or equal to √ 2 exp(iωt) if it corresponds to a time dimension. By using the Dirac propagation equation and combinatorics we showed that the electron has a mass of 2 19 eV/c 2 , the quark has a mass of 2 21 eV/c 2 and the electron neutrino has a mass of 2eV/c 2. Finally, the Higgs boson is showed to have a mass of 2 37 eV/c 2




Textural, Structural and Electrical Characterizations of EMI MAc Silica Ionogels and Their Corresponding Aerogels
Auteur(s): Bengourna Nadjette, Despetis F., Bonnet L., Courson R., Solignac P., Satha Hamid, OliviTran N.
(Article) Publié:
Applied Physics Research, vol. 6 p.16 (2014)
Ref HAL: hal01061376_v1
DOI: 10.5539/apr.v6n4p16
Exporter : BibTex  endNote
Résumé: Silica ionogels were synthesized from tetramethoxysilane (T MOS ),methyltrimethoxysilane (MT MS ) and 1ethyl 2methylimidazolium Acetate (EMI MAc: Ionic Liquid) in different proportions .The textural characterizations showed an effect of these concentrations on the corresponding aerogels: pore size distributions and effective surfaces. The structure of the aerogels was measured with a SAXS (Small Angle XRay Scattering) apparatus and was typical of acid catalyzed aerogels. Conductivity voltage measurements, operated on the ionogels, were carried out using an electrical 4 wireelectrodes set up. The electrical voltage temporal response of the EMIMAc silica ionogel was modelled by a RLC series circuit which characteristics depended on the synthesis.


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