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Rozprawy doktorskie na temat "Couplage fort vibrationnel"
Muller, Cyprien. "Supramolecular catalysis and vibrational strong coupling : how to influence chemical reactivity ?" Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF014.
Pełny tekst źródłaHow can we influence chemical reactivity? Throughout this thesis, I attempted to answer this question by exploring the frontier between chemistry and physics.First, I took advantage of solvent 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) which often unlocks exotic reactivity that can be explained by its extraordinary physical properties. These properties make of HFIP a veritable supramolecular matrix, which allowed the development of a new method for the synthesis of densely functionalized isochromans. This method displayed unprecedented generality, simplicity, and practicality on the way to this pharmacologically important motif.Second, I investigated how light-matter hybridization, accessed through Vibrational Strong Coupling (VSC) could alter the kinetics of some chemical reactions. In practice, by placing different reactants between two mirrors, I studied the impact of VSC on nucleophilicity, as well as on Diels-Alder reactivity
Wu, Hailong. "Modelization and control of synchronous reluctance machines for the torque ripple minimization - study of vibrational and acoustic behavior". Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCA003.
Pełny tekst źródłaThis thesis aims to study the control and optimization of a synchronous reluctance machine for the purpose of improving the vibrational performance. The main works of the thesis can be classified into three parts: the proposed torque ripple reduction method, the factors which can influence the proposed method and the influence of the proposed method.At first, the torque ripple of synchronous reluctance machine is reduced by a control method. Firstly, a torque equation is proposed in order to present the relationship between torque ripple and the optimal currents. Then a new parameter, torque function, is put forward. Based on the torque function, the torque ripple reduction strategy is presented. Two different torque ripple minimizations are proposed by applying different torque function harmonics. They are analyzed and compared in order to define the optimal method. In order to test the proposed method further, the selected torque ripple minimization approach is applied to three SynRMs. The results of finite element simulations imply that the proposed method is effective to decrease the torque ripples of these three SynRMs. The proposed torque ripple reduction method is verified according to the models built in MATLAB/Simulink and the experiment results respectively.Then the factors which could influence the proposed torque ripple reduction method are analyzed. Firstly, torque function is a function of rotor position, current angle and saturation. Based on the model in Simulink, the influence of different starting position on the performance of the studied SynSR is analyzed. Besides, the estimated position errors produced by senserless control could also affect the toque ripple minimization by changing torque function. At last, the influence of saturation on the proposed torque ripple reduction method is introduced because the amplitudes of the optimal currents are increased.In addition, the influence of torque ripple reduction on the other perfomances of SynRM is analyzed. The optimal currents have more harmonics than the original sinusoidal currents. So three losses (copper losses, iron losses and inverter losses) are modeled, calculated, analyzed and compared. According to the results, the copper losses are the most sensible losses. The iron losses and the inverter losses are a little increased and the increased parts can be neglected. Besides, reducing torque ripple by adding stator currents could influence the vibro-acoustic of the studied SynRM. Thus this section aims to explain the relationship between torque ripple reduction and acoustic noise. An analytical equation is proposed in order to evaluate the variation of noise produced by torque ripple reduction. Simulations in Flux 2D have been performed in order to calculate the variation of noise resulted by torque ripple reduction. At last, the software Manatee which is professional in studying the vibration and noise is applied for the purpose of comparing the results with those of the finite element analysis
Streszczenia konferencji na temat "Couplage fort vibrationnel"
Pratt, David W. "Methyl rotors in large molecules: probes of intramolecular vibrational relaxation and electronic structure". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.fg2.
Pełny tekst źródłaHohl, Andreas, Christian Siewert, Lars Panning i Andreas Kayser. "Nonlinear Vibration Analysis of Gas Turbine Bladings With Shroud Coupling". W ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50787.
Pełny tekst źródłaMotriuk, Roman W., Timothy Schmidt, John Webster i Thangavel Thevar. "Determination of Dynamic Velocity and Strain Using Wide Field Holographic Interferometry: Verification". W 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-276.
Pełny tekst źródłaDiambu, Alif Ngimbi, i Mehmet Çevik. "Finite Element Vibration Analysis of a Functionally Graded Plate". W International Students Science Congress. Izmir International Guest Student Association, 2021. http://dx.doi.org/10.52460/issc.2021.043.
Pełny tekst źródłaPemberton, Jeanne E. "Surface Raman Scattering as a Probe of Metal Surface Chemistry". W Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/laca.1992.thb1.
Pełny tekst źródłaPop, Eric. "Electron-Phonon Interaction and Joule Heating in Nanostructures". W ASME 2008 3rd Energy Nanotechnology International Conference collocated with the Heat Transfer, Fluids Engineering, and Energy Sustainability Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/enic2008-53050.
Pełny tekst źródłaD’Souza, Kiran, i Meng-Hsuan Tien. "Bilinear Amplitude and Frequency Approximation for Nonlinear Systems With Gaps or Prestress". W ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59062.
Pełny tekst źródłaReich, Alton J., Steve J. Doherty i Keith A. Williams. "Load Reduction on Valve Position Indicators in High Vibration Environments". W ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71118.
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