Relevant bibliographies by topics / Approximation dipolaire

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Academic literature on the topic 'Approximation dipolaire'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Approximation dipolaire"

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Curecheriu, Lavinia-Petronela. "Tunability modeling and experiments for BaTiO3-based solid solutions." Processing and Application of Ceramics 1, no. 1-2 (2007): 23–27. http://dx.doi.org/10.2298/pac0702023c.

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In this paper, the electric field dependence of the dielectric constant in some BaTiO3-based ferroelectrics is theoretically described by means of the Landau-Ginzburg-Devonshire (LGD) theory and its? approximations valid for low polarizations (Johnson?s equation and even-power relation) when the sample is in its ferroelectric state and by a model considering random non-interacting dipolar units in a double well potential for the paraelectric state. High-voltage tunability data were obtained at room temperature for BaZr0.10Ti0.90O3 and Ba0.70Sr0.30TiO3 ceramics. The data were well fitted by usi
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TOMITA, YUSUKE, SHUNSUKE YANAI, and HAJIME TAKAYAMA. "A MEAN-FIELD APPROACH TO A DISCRETE DIPOLAR SPIN MODEL WITH UNIAXIAL MAGNETIC ANISOTROPY." International Journal of Modern Physics C 20, no. 09 (2009): 1335–43. http://dx.doi.org/10.1142/s0129183109014400.

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Using the mean-field approximation, we study the reorientation transition in a discrete dipolar spin model. We array the d-dimensional spins in the d-1-dimensional hypercubic lattice points, and apply the magnetic anisotropy in the dth direction. Even though the long-range dipolar interaction is truncated to the nearest-neighbor interaction, the model exhibits the reorientation transition. The effects of the exchange interaction on the dipolar system are also studied.
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Wu, Gang, Roderick E. Wasylishen, William P. Power, and Graziano Baccolini. "Phosphorus-31 chemical shieldings in a fused cis-1,2,3-benzothiadiphosphole: a dipolar NMR study." Canadian Journal of Chemistry 70, no. 4 (1992): 1229–35. http://dx.doi.org/10.1139/v92-159.

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Phosphorus-31 NMR static powder spectra and high-resolution magic angle spinning spectra have been obtained for a new heterocyclic compound, cis-2,10-dimethyl[1,2,3]benzothiadiphospholo[2,3b][1,2,3]benzothiadiphosphole (1), which contains a P(III)—P(III) single bond. The homonuclear 31P–31P dipolar interaction manifests itself in both the magic angle spinning spectra and the non-spinning line shape. Under the AX spin pair approximation, analysis of the spinning sidebands in the MAS experiment yields a full characterization of the two 31P chemical shielding tensors. This approximation is confir
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Corruccini, L. R., and Steven J. White. "Dipolar antiferromagnetism in the spin-wave approximation." Physical Review B 47, no. 2 (1993): 773–77. http://dx.doi.org/10.1103/physrevb.47.773.

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Petitdemange, L., and R. Raynaud. "Dipole collapse in rotating stratified dynamos." EAS Publications Series 82 (2019): 357–63. http://dx.doi.org/10.1051/eas/1982031.

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Numerical modelling of convection driven dynamos in the Boussinesq approximation revealed fundamental characteristics of the dynamo-generated magnetic fields, but the relevance of these results remains to be assessed for highly stratified systems, like gas planets and stars. The common approach is then to rely on the anelastic approximation to model the background density stratification. A conclusion from different anelastic studies is that dipolar solutions seem more difficult to obtain in presence of a substantial density contrast. We review some important results obtained by Raynaud et al.
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Alexandrov, Artem A., Alina U. Badamshina, and Stanislav L. Ogarkov. "Quantum Gases of Dipoles, Quadrupoles and Octupoles in Gross–Pitaevskii Formalism with Form Factor." Condensed Matter 5, no. 4 (2020): 61. http://dx.doi.org/10.3390/condmat5040061.

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Here, classical and quantum field theory of dipolar, axisymmetric quadrupolar and octupolar Bose gases is considered within a general approach. Dipole, axisymmetric quadrupole and octupole interaction potentials in the momentum representation are calculated. These results clearly demonstrate attraction and repulsion areas in corresponding gases. Then the Gross–Pitaevskii (GP) equation, which plays a key role in the present paper, is derived from the corresponding functional. The zoology of the form factors appearing in the GP equation is studied in details. The proper classes for the descripti
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Lošić, Željana Bonačić. "Coupling of plasmon and dipolar modes in a monolayer of MoS2." Modern Physics Letters B 28, no. 12 (2014): 1450099. http://dx.doi.org/10.1142/s0217984914500997.

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The dielectric function of a monolayer of molybdenum disulfide is investigated within the model of two-band metal using the random phase approximation (RPA). The large direct bandgap in a monolayer of MoS 2 leads to the appearance of the interband dipolar mode which couples to the intraband plasmon mode. This results in two hybridized modes. The renormalized dipolar mode is close to its bare value, while coupling suppresses the plasmon mode. The obtained modes are responsible for the appearance of dispersing peaks in the energy-loss function.
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LI, HAIJIN. "THE STUDY OF THE MAGNETIC MULTIVALUED RECORDING AT THE EXIST OF DIPOLAR INTERACTION." International Journal of Modern Physics B 16, no. 13 (2002): 1841–51. http://dx.doi.org/10.1142/s0217979202011251.

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A classical method is established to study the conditions for the magnetic multivalued (MMV) recording at the exist of dipolar interaction. In order to simplify the problem, we adopt the approximation that the spins in the same layer have the same direction. With this approximation, a set of nonlinear equations is derived, from which what area of parameters is suitable for the MMV recording can be decided. We use this method to detailedly discuss the two magnetic layers system that can be solved analytically. For this system, the area of parameters, in which the MMV recording can be realized,
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Henderson, Douglas, Dezső Boda, István Szalai, and Kwong-Yu Chan. "The mean spherical approximation for a dipolar Yukawa fluid." Journal of Chemical Physics 110, no. 15 (1999): 7348–53. http://dx.doi.org/10.1063/1.478636.

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Sloth, Peter, and Lesser Blum. "Optimized analytical direct correlation function approximation for dipolar fluids." Journal of the Chemical Society, Faraday Transactions 2 85, no. 7 (1989): 879. http://dx.doi.org/10.1039/f29898500879.

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Dissertations / Theses on the topic "Approximation dipolaire"

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Johner, Albert. "Approche microscopique et macroscopique de la reflectivite d'interfaces." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13114.

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Lallich, Sylvain. "Détermination expérimentale et modélisation des propriétés radiatives de matrices nanoporeuses de silice." Phd thesis, INSA de Lyon, 2009. http://tel.archives-ouvertes.fr/tel-00397453.

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Les superisolants thermiques sont largement étudiés car il permettraient de réduire les émissions de $\mathrm{CO}_2$. Nous voulons modéliser les propriétés radiatives de matrices nanoporeuses de silice qui sont les composants majeurs de ces matériaux. Des échantillons ont été fabriqués puis caractérisés sur la plage de longueur d'onde [250~nm ; 20~mm]. Nous avons ensuite calculé leurs propriétés radiatives avec une méthode inverse. Les échantillons étant constitués de particules quasisphériques, nous avons modélisé leurs propriétés radiatives avec la théorie de Mie. La notion de diffuseur repr
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Véniard, Valérie. "Transitions à un et deux photons dans le spectre continu du potentiel coulombien." Paris 6, 1986. http://www.theses.fr/1986PA066152.

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Calcul par la théorie des perturbations à l'ordre le plus bas par rapport au rayonnement électromagnétique, en traitant exactement le potentiel coulombien, avec une approche non relativiste pour décrire l'électron et l'approximation dipolaire pour l'interaction électron-champ électromagnétique. Cas des transitions à 1 photon dans l'espace des impulsions. Pour les transitions à 2 photons, sommation infinie sur les états intermédiaires au moyen de la fonction de green coulombienne. Analyse de plusieurs cas limites.
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Galan-Malaga, Horacio. "Diffraction électromagnétique en puits de forage : approximations dipolaires et application au problème inverse." Paris 11, 1989. http://www.theses.fr/1989PA112182.

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Le sondage du sous-sol à l'aide d'un puits de forage est un moyen couramment utilisé dans les études géophysiques et dans la recherche d’hydrocarbures. Ce travail concerne les possibilités du sondage électromagnétique du sous-sol dans un tel puits de forage, sondage dont le but est de permettre d'accéder aux valeurs de la permittivité et de la conductivité du sous-sol. Le principe de l'outil de sondage est le suivant : une petite boucle de courant placée sur l'axe du puits rayonnant à 25 MHz, produit une onde à symétrie axiale, dont une partie se propage dans le sous-sol et revient dans le pui
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Mainos, Constantinos. "Etude des transitions mutiphotoniques dans des molécules diatomiques." Paris 13, 1986. http://www.theses.fr/1986PA132001.

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Etude des transitions rovibroniques multiphotoniques de type dipolaire électrique pour des états moleculaires présentant un couplage de hund (a),(b) ou un couplage intermediaire entre (a) et (b), à l'approximation adiabatique pour décrire la vibration et la rotation. Expressions de l'intensité des raies rotationnelles dans le cas d'une polarisation linéaire ou circulaire et pour des photons identiques. Régles de sélection pour la rotation et le couplage ou se trouvent les états moléculaires (initial et final) pour le cas général d'une transition à "n" photons et d'une multiplicité quelconque.
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Cobo, Márcio Fernando. "Exploração de técnicas de RMN dipolar e aproximações analíticas no estudo de reorientações de segmentos moleculares." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-03022014-103352/.

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Neste trabalho exploramos o uso de sequências de pulsos de Ressonância Magnética Nuclear de Estado Sólido (RMN-ES) que utilizam o acoplamento dipolar magnético heteronuclear para o estudo de reorientações de segmentos moleculares no regime intermediário, testando-as em amostras modelo a fim de verificar suas eficiências. Paralelamente, simulações numéricas foram realizadas juntamente com cálculos analíticos para a melhor compreensão dos efeitos experimentais observados nessas sequências de pulsos. A primeira proposição, baseia-se no uso de Perfis de Hartmann-Hahn obtidos utilizando a Transferê
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Sopena, Moros Arturo. "Etude des effets relativistes en régime d’interaction non-linéaire entre les molécules et les impulsions laser brèves dans les domaines de fréquences XUV et X mous." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0131.

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Le développement des sources XUV intenses du type laser à électrons libres (LEL) et génération d’harmoniques d’ordre élevé (GHOE) en régime femtoseconde (fs) et sub-fs permet l’investigation des processus non-linéaires ultra rapides dansl’interaction laser-matière. Dans le contexte de l’étude de la dynamique de la photoionisation moléculaire aux temps ultra-brefs, la résolution directe de l’équation de Schrödinger dépendante du temps (ESDT) s’est révélée cruciale pour l’interprétationdes observations expérimentales. Dans cette thèse, nous présentons des calculs ab-initio pour la photo-ionisati
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