Дисертації з теми "Surface mode oscillations"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-21 дисертацій для дослідження на тему "Surface mode oscillations".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Cleve, Sarah. "Microstreaming induced in the vicinity of an acoustically excited, nonspherically oscillating microbubble." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC028/document.
Повний текст джерелаMicrobubbles find use in several domains, one of them being medical ultrasound applications. Different characteristics of those bubbles such as their acoustic resonance or their destructive effect during inertial cavitation can be exploited. Another phenomenon induced around acoustically excited bubbles is microstreaming, that means a relatively slow mean flow with respect to the fast bubble oscillations. Microstreaming and its associated shear stresses are commonly agreed to play a role in the permeabilization of cell membranes, a detailed understanding of the induced flows is however missing. To acquire basic physical knowledge, this work focuses on the characterization of streaming induced around an air bubble in water, more precisely around a single acoustically trapped and excited, nonspherically oscillating bubble. The experimental part consists of two steps. First, the bubble dynamics, in particular the triggered shape mode and the orientation of the bubble have to be controlled. For this, the use of bubble coalescence proves to be an adequate method. In a second step, the microstreaming is recorded in parallel to bubble dynamics. This allows to correlate the obtained streaming patterns to the respective shape oscillations. The large number of obtained pattern types can be classified, in particular with respect to the mode number and bubble size. A close investigation of the bubble dynamics allows furthermore deducing the important physical mechanisms which lead to such a variety of streaming patterns. In order to confirm the experimental findings, an analytical model has been developed. It is based upon time-averaged second-order fluid mechanics equations and the experimentally obtained bubble dynamics serves as input parameters. Supplementary to the microstreaming work, this manuscript contains a short section on directed jetting of contrast agent microbubbles, which might appear at high acoustic driving. The impact of those microjets on cell membranes presents another mechanism made responsible for the permeabilization of cell membranes
Chen, Chia-Jeng. "Hydro-climatic forecasting using sea surface temperatures." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/48974.
Повний текст джерелаAchlan, Moustafa. "Surface Plasmon Polariton and Wave Guide Modes in a Six Layer Thin Film Stack." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS109.
Повний текст джерелаIn this thesis, we investigate the optical properties of a six-layer stack (air-Au-SiO₂-Au-Ti-glass). The interfaces are flat and the modeling is performed using elementary Fresnel expressions at the interface and plane wave propagation in the layers. Two models are used where the sample is: i) excited by a source at infinity (excitation by source at infinity (ESI)); ii) excited by a local source. In the experiments we are modeling this source consists of the inelastic tunneling electrons from a scanning tunneling microscope (STM). In our modeling this source is replaced by a vertical oscillating dipole. Using these two models one calculates the reflected (reflectance) and the transmitted (transmittance) flux from a source at infinity and the transmitted flux of a local source. Surface plasmon polariton (SPP) and wave guide (WG) modes may be identified in the reflectance, transmittance and transmitted flux. In a particular wavelength domain the SPP and WG repel each other giving rise to an avoided crossing. The choice of the gold (Au) and silica (SiO₂) thicknesses of the six-layer stack is guided by two requirements: high amplitude of the observable and wide wavelength dependence of the in-plane wave vector. We also study the influence of the gold and silica thicknesses on the observables. We find that the observables are significant for dAu[10, 90 nm] for the three and dAu[10, 50 nm] for six layer stacks and this predictive study guided the choice of the experimental sample thicknesses. The wave guide mode appears for dSiO₂ >190 nm. The electric field as a function of the penetration coordinate z is calculated in order to characterize the location of the field in the stack and to assign the nature of the modes. We observe that for the SPP the electric field is confined at the Au-air interface whereas, the electric fields corresponding to the WG mode are confined inside SiO₂ layer. Our calculations presented in this work are in good agreement with the experimental measurements performed in our group
Chen, Lihui. "Synthesis and Plasmonic Properties of Copper-based Nanocrystals." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/217134.
Повний текст джерелаMaliniemi, V. (Ville). "Observations of solar wind related climate effects in the Northern Hemisphere winter." Doctoral thesis, University of Oulu, 2016. http://urn.fi/urn:isbn:9789526213545.
Повний текст джерелаAwo, Founi Mesmin. "Modes interannnuels de la variabilité climatique de l'Atlantique tropical, dynamiques oscillatoires et signatures en salinité de surface de la mer." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30171/document.
Повний текст джерелаIn this thesis, we investigate several topics related to the interannual climatic modes in the tropical Atlantic. Statistical analyses allows us to extract the two main dominant modes of interannual variability: an equatorial mode and a meridional mode. The equatorial mode is responsible for Sea Surface Temperature (SST) anomalies mainly found in the Gulf of Guinea and is linked to variations of the sea-level slope in the equatorial band. It is due to dynamic feedbacks between zonal wind, sea level and SST. The meridional mode is characterised by inter-hemispheric SST fluctuations and is controlled by dynamic and thermodynamic feedbacks between the wind, evaporation and SST. After quantifying the coupling between key variables involved in the meridional mode, we develop a conceptual model to explain the main mechanisms responsible for meridional mode oscillations. The model shows that the meridional mode results from the superposition of a self-sustaining mechanism based on positive and negative feedbacks generating regular oscillations of high frequency (2-3 years) and another low frequency oscillation mechanism (4-9 years) related to the influence of ENSO. As the evolution of these two modes is strongly linked to the meridional shift of the Intertropical Convergence Zone (ITCZ) and associated rainfall maximum, we identify the signature of these modes on Sea Surface Salinity (SSS) using in situ observations and a regional numerical simulation. Oceanic and/or atmospheric processes responsible for the signature of each mode are also identified through a mixed-layer salt budget in the validated model. The salt balance reveals that the atmospheric forcing, related to the ITCZ migration, controls the equatorial region while the advection, due to the modulation of current dynamics, the vertical gradient and mixing at the base of the mixed layer, explains SSS variations in regions under the influence of plumes. Finally, we study the Equatorial Kelvin wave characteristics and influences on the density that are involved in the meridional and equatorial mode connection processes, using a very simplified model of gravity wave propagation along the equator. After a brief description of this model, which was initially constructed to study dynamics in the equatorial Pacific, we apply it to the specific case of the equatorial Atlantic by validating its analytical and numerical solutions under adiabatic conditions. [...]
Ayina, Ludos-Hervé. "Etude des modes de variabilité de l'océan Atlantique tropical et de leur sensibilité à l'impact des décharges fluviatiles et des précipitations." Paris 6, 2002. http://www.theses.fr/2002PA066019.
Повний текст джерелаThakore, Vaibhav. "Nonlinear dynamic modeling, simulation and characterization of the mesoscale neuron-electrode interface." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5529.
Повний текст джерелаPh.D.
Doctorate
Physics
Sciences
Physics
Rath, Pranaya Kishore. "Experimental Investigation of Electrons In and Above Liquid Helium." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5838.
Повний текст джерелаINSPIRE, DST India
Das, Surajit. "Role Of Sea Surface Temperature Gradient In Intraseasonal Oscillation Of Convection In An Aquaplanet Model." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2583.
Повний текст джерелаDas, Surajit. "Role Of Sea Surface Temperature Gradient In Intraseasonal Oscillation Of Convection In An Aquaplanet Model." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2583.
Повний текст джерелаLin, Tzong-Shyan, and 林宗賢. "Surface Plasmon Excitation, Mode Splitting in Slab Wave Guides and Dynamic Oscillation Studies of Liquid Crystals." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/52149969599929734277.
Повний текст джерела國立清華大學
物理學系
90
In this work, we are devoted to study the optical properties of nematic liquid crystal (LC) from the anisotropic birefringence behavior view. These include the shift of minimum attenuated total reflection angle, the mode splitting, and the nonlinear dynamic oscillation. The scenario of this work will be portrayed as follows. Attenuated total reflection (ATR) is a prominent effect in examining the excitation of surface plasmons. The Kretcshmann-Raether configuration is implemented to generate the surface plasmon and to examine the change of the refractive index of LC by an applied field. A mixture of nematic and cholesteric liquid crystal is sandwiched between two glass substrates coated with conducting films. The minimum ATR angle changes less than 1o as the applied voltage increases to as large as 30Vpp, which is controvertible to the calculation based on field induced refractive index change. This fact suggests that the orientation of LC directors adjacent to the electrode surface is unaffected in response to the external field attributing to the strong anchoring effect. Extended Jones matrix simulation imposed with multi-layered structure of LC clearly adducing this fact. Mode splitting is found with a He-Ne laser beam reflecting through a prism-coupled liquid-crystal slab waveguide applied with an electric field. Mode splitting yields stronger manifestation as the imposed voltage passes a critical level, yet it becomes diminished above a critical high voltage. If the voltage increases even higher, mode splitting would disappear, attributing to the turning up of almost all the directors of LC to the surface. Our multi-layered matrix simulation can satisfactorily account for this phenomenon by exploiting the property of the anisotropic optical birefringence of LC under applied voltages. Relaxation oscillations of optical transmittance after the turn-off of the applied electric field of LCs are observed when the detected light transmits through a proper adjustment of the alignment of the polarizer and analyzer. Approximated dynamic simulation, which do not concern the back-flow effect and neglect the inertia terms, of the LC molecule at each layer yields relevant polarization interference of the transmitted light. This effect can satisfactorily portray the oscillation phenomenon. Optics with the extended Jones 4x4 matrix formalism, which is relevant in elucidating the optical properties of anisotropic media, is also implemented to solve this problem.
Royon-Lebeaud, Aude. "Ballottement des liquides dans les réservoirs cylindriques soumis à une oscillation harmonique: régimes d'onde non-linéaire et brisure." Phd thesis, 2005. http://tel.archives-ouvertes.fr/tel-00009117.
Повний текст джерелаVenugopal, Thushara. "Sensitivity of Sea Surface Temperature Intraseasonal Oscillation to Diurnal Atmospheric Forcings in an OGCM." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3347.
Повний текст джерелаVenugopal, Thushara. "Sensitivity of Sea Surface Temperature Intraseasonal Oscillation to Diurnal Atmospheric Forcings in an OGCM." Thesis, 2013. http://etd.iisc.ernet.in/2005/3347.
Повний текст джерелаBhattacharya, Anwesa. "Role of Aerosols in Modulating the Intraseasonal Oscillations of Indian Summer Monsoon." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2864.
Повний текст джерелаBhattacharya, Anwesa. "Role of Aerosols in Modulating the Intraseasonal Oscillations of Indian Summer Monsoon." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2864.
Повний текст джерелаZvejnieks, Guntars. "Catalytic Surface Reactions: Monte Carlo Simulations of Systems with Creation, Annihilation and Diffusion of Interacting Reactants." Doctoral thesis, 2001. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2001061912.
Повний текст джерелаGhosh, Rohit. "Interannual Variation of Monsoon in a High Resolution AGCM with Climatological SST Forcing." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3350.
Повний текст джерелаGhosh, Rohit. "Interannual Variation of Monsoon in a High Resolution AGCM with Climatological SST Forcing." Thesis, 2013. http://etd.iisc.ernet.in/2005/3350.
Повний текст джерелаKoch, Philipp. "Partikelmodellierung der Strukturbildung akustischer Kavitationsblasen in Wechselwirkung mit dem Schalldruckfeld." Doctoral thesis, 2006. http://www.gbv.de/dms/goettingen/524828539.pdf.
Повний текст джерела