Academic literature on the topic 'Mouvements moléculaires de grande amplitude'
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Journal articles on the topic "Mouvements moléculaires de grande amplitude":
Vandervoort, Anthony A., Bert M. Chesworth, and Nancy S. Mick Jones. "Passive Ankle Stiffness in Young and Elderly Men." Canadian Journal on Aging / La Revue canadienne du vieillissement 9, no. 2 (1990): 204–12. http://dx.doi.org/10.1017/s0714980800013179.
Beccaria, Pierre. "La réforme foncière en Guadeloupe (1950-1994)." Bulletin de la Société d'Histoire de la Guadeloupe, no. 111 (February 9, 2018): 51–103. http://dx.doi.org/10.7202/1043232ar.
Dissertations / Theses on the topic "Mouvements moléculaires de grande amplitude":
Lux, Jacques. "Nouvelles navettes moléculaires : vers des mouvements rapides et de grande amplitude." Strasbourg, 2009. http://www.theses.fr/2009STRA6165.
Gyawali, Prakash. "Terahertz spectroscopy of molecules and molecular complexes of atmospheric interest exhibiting large amplitude motions." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR071.
The atmosphere comprises a diverse array of molecules and species. Among these, water vapor and its complexes have a significant role in the phenomenon of global warming and climate change. Spectroscopic analysis of such complexes is essential for understanding various atmospheric processes. However, there is still a limited knowledge on weakly bounded water complexes in the terahertz wave range due to their complex spectral features and experimental challenges. Spectral complexity often results from the large amplitude motions limited by low potential barriers.We present the development of pulsed-jet emission spectrometer intended for studies of molecular complexes in the terahertz range. Experimental developments were accompanied by benchmarking large amplitude motions models on the molecules of atmospheric interest. We started with acetyl halides exhibiting a periodic torsional motion of methyl group. We obtained accurate models of the rotational spectra of acetyl chloride and acetyl bromide within experimental accuracy. Subsequently, the rotational spectra of methylamine in its first excited torsional state were studied. Methylamine is characterized by two large amplitude motions: torsion and inversion. The rotational spectrum of methylamine was analyzed using the so-called "hybrid" model that for the first time allowed accurate assignment and modeling of the lowest excited torsional states. Finally, the high-resolution rotational spectra of ammonia-water weakly bounded complex were measured using the newly built spectrometer. For the analysis of ammonia-water which exhibits two large amplitude motions similar to methylamine, we also applied the "hybrid" approach demonstrating thus its advantage in the application to excited states and low barrier cases.Keywords: mm/sub-mm wave spectroscopy, large-amplitude motions, high-resolution, internal rotation, weakly bounded complex, pulse jet, chirped pulse
Sanejouand, Yves-Henri. "Etude théorique des mouvements internes de grande amplitude de la décaalanine et du fragment C-terminal de la protéine ribosomale L7/L12." Phd thesis, Université Paris Sud - Paris XI, 1990. http://tel.archives-ouvertes.fr/tel-00266537.
GUILBERT, CHRISTOPHE. "Etudes theoriques des mouvements de grande amplitude dans les proteines." Paris 7, 1996. http://www.theses.fr/1996PA077214.
Gilloteaux, Jean-Christophe. "Mouvements de grande amplitude d'un corps flottant en fluide parfait. Application à la récupération de l'énergie des vagues." Phd thesis, Ecole centrale de nantes - ECN, 2007. http://tel.archives-ouvertes.fr/tel-00521689.
Sanejouand, Yves-Henri. "Etude theorique des mouvements internes de grande amplitude de la decaalanine et du fragment c-terminal de la proteine ribosomale l7/l12." Paris 11, 1990. http://www.theses.fr/1990PA112136.
Berger, Jean François. "Approche microscopique auto-consistante des processus nucléaires collectifs de grande amplitude à basse énergie : application à la diffusion d'ions lourds et à la fission." Paris 11, 1985. http://www.theses.fr/1985PA112268.
A theoretical framework and numerical techniques allowing to describe low energy, large amplitude collective phenomena in nuclei from the only data of the nuclear effective interaction is presented. In this method, the collective properties of the system are analyzed with the help of the full Hartree-Fock-Bogolyubov theory and different kinds of constraints acting as external fields. The collective dynamics is then deduced from the self-consistent approach in a completely quantum-mechanical formalism based on the Generator Coordinate prescription and the adiabatic approximation. With this procedure, nuclear structure effects, in particular the influence of pairing correlations on the collective dynamics, are incorporated in a completely microscopic and self-constent way. The applications we present use GOGNY’S D1 effective interaction. Due to the very general parametrization of this force – in particular, its finite range – most known nuclear properties, including those associated to pairing, can be reproduced quantitatively. The ¹²C + ¹²C reaction at low energy is first studied. The position of the two first 0⁺ resonances is consistent with experimental data. The analysis of the wave functions shows that these resonances do not arise from a quasi-molecular ¹²C - ¹²C state. Our approach is then applied to the fission of ²⁴⁰Pu. Potential energy surfaces as functions of elongation, left-right asymmetry and necking-in are displayed. The main known characteristics of these surfaces, in particular fission barrier heights appear to be correctly reproduced. An interpretation for the mechanism of scission and for cold fission events is proposed. A dynamical calculation taking into account the variations of the collective inertia confirms this interpretation and shows that the nuclear evolution between saddle and scissions can be described using the adiabatic approximation
Lozada-Garcia, Rolando. "Dynamics and Photodynamics of Acetylacetone in para-Hydrogen matrices." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00780495.
Nguyen, Thi Thuy. "Structures and internal dynamics of methylated nitrogen containing aromatic rings probed by means of microwave spectroscopy, quantum chemical calculation and spectral modelling." Electronic Thesis or Diss., Université Paris Cité, 2021. http://www.theses.fr/2021UNIP7368.
This work is dedicated to the study of rotational signatures of six methylated nitrogen containing aromatic rings (2-methylthiazole (2MTA), 2-methypyrrole (2MP), 3-methylpyrrole (3MP), 2,5-dimethylpyrrole (25DMP), 4,5-dimethylthiazole (45DMTA), 4-methylpyrimidine (4MPY) – some important precursors of polycyclic aromatic hydrocarbon which play crucial roles in astrochemistry and have potential to be detected in space. Our study focuses on sharpening the understanding on the large amplitude motion(s) effects of the methyl group(s), providing accurate molecular parameters in the gas phase and a list of precise line positions for astronomical search. Probed by means of microwave spectroscopy, quantum chemistry and spectral modelling, the rotational spectra of those molecules were studied in details, allowing the determination of accurate geometries, internal rotation potential barriers and nuclear quadrupole coupling constants. For the 2MTA, 2MP and 3MP molecules which contain one 14N and one internal rotation methyl group, our investigations confirm that quantum chemical calculations with sufficient large basis set often yielded reliable results for geometrical parameters (e.g., rotational constants, centrifugal distortion constants) but often failed in predicting the value of barrier to internal rotation of methyl group, especially when the methyl group possesses a rather low barrier. Our results show that the skeleton atom as well as the frame symmetry plays an important role in the resulting barrier height. By studying the chemical bond at the site of the 14N within the rings, we were able to link the electronic configurations to the signs of quadrupole coupling constants χcc. For the 25DMP and 45DMTA molecules, new features of the BELGI code were implemented to model the rotational spectra of molecules with two rotors and one 14N. A new code called WS18 was introduced and used to fit each species separately which helped confirming the assignments. With regard on the value of methyl torsional barrier, while steric hindrance was mainly found in case of the 25DMP, the electronic distribution is found to have more significant effect in case of 45DMTA. For the 4MPY molecule we introduced a new code called TW21, written for modelling the microwave spectrum of molecule with one rotor and up to two weakly nuclear quadrupole coupling. Similar feature was also implemented into the BELGI-2N code as well as WS18 codes. The new code TW21 was successfully tested on the 2MTA, 2MP and 3MP molecules, obtaining results in excellent agreement with the findings from BELGI code. The rotational signature of 4MPY was investigated and analyzed using the WS18, BELGI-2N and TW21 programs, leading to very accurate molecular parameters