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Tesi sul tema "Oscillations"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Kuzovkov, Vladimir, Guntars Zvejnieks, Olaf Kortlüke, and Niessen Wolfgang von. "Forced oscillations in self-oscillating surface reaction models." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-195406.

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2

Kuzovkov, Vladimir, Guntars Zvejnieks, Olaf Kortlüke, and Niessen Wolfgang von. "Forced oscillations in self-oscillating surface reaction models." Diffusion fundamentals 2 (2005) 27, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14357.

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3

Andes, Derek. "Orbital oscillations." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/919.

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4

Fraser, Geoffrey Alan. "Nonradial oscillations in Spica." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24667.

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The absorption line profiles of Spica (α Virginis, HD116658, B1.5IV, m=0.97) show features, at about the 1% level, moving from the blue wavelengths towards the red wavelengths. A series of spectra were taken, at the 1.22 m telescope at the Dominion Astrophysical Observatory on three nights in April, 1982 and two nights in April, 1984, to study these moving features. As Spica is a member of a binary system, the effect of the secondary had to be removed from the observations. This was done by subtracting a template spectrum which had been scaled, broadened and shifted to match the secondary, fro

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5

Rangavajhula, Krishna C. "Nonstationary oscillations through bifurcations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23875.pdf.

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6

Reid, Giles Adrian. "Neutrino Oscillations in Astrophysics." Thesis, University of Canterbury. Physics and Astronomy, 2010. http://hdl.handle.net/10092/4935.

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A survey of the theory of neutrino oscillations in dense matter and neutrino backgrounds is presented. We discuss collective neutrino systems using the gyroscopic pendulum analogy and describe the motion that results from self-induced parametric resonances. The effects of dense matter on the flavour oscillations of neutrinos are also detailed. This theory is applied to the case of continuous supernova neutrino spectra and explanations of the spectral swapping behaviour seen in numerical studies are summarized. The results of numerical simulations of supernova oscillations in turbulent superno

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7

Pennequin, Denis. "Contrôle optimal et oscillations." Paris 1, 2000. http://www.theses.fr/2000PA010061.

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Dans cette thèse, nous nous sommes intéressés au problème du Contrôle Optimal des oscillations et à quelques applications économiques. Tout d'abord, on a mis en forme le formalisme de Percival liant une fonction quasi-périodique (=q. P. ) à sa génératrice sur le tore, avec un lien se comportant bien au niveau différentiel. Une étude du cas à paramètre, nécessaire pour traiter des équations autonomes, permet d'obtenir un théorème d'isomorphisme entre l'espace des fonctions presque- périodiques ( =p. P. ) à paramètres et un espace de fonctions p. P. à valeurs dans un Banach. Relativement au form

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8

Todd, Thomas. "Robust oscillations in cells." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685923.

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Oscillating chemical signals in cells play an essential role in biological processes. Understanding how to produce reliable oscillators using cellular machinery is useful for genetic engineering and is a key goal of synthetic biology. Motivated by an analysis of the robustness of a biological oscillator found in the cell cycle, a new technique is developed to evaluate the robustness of nonlinear models of oscillating genetic networks. This technique has been embedded in a software framework called INTRON which can be used by biologists seeking to design robust genetic oscillators or to underst

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9

Amon, Axelle. "Dynamique temporelle des oscillateurs paramétriques optiques continus : oscillations multimodes, oscillations en rafales et chaos." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2003. http://tel.archives-ouvertes.fr/tel-00004477.

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Les oscillateurs paramétriques optiques (OPO) continus sont des sources de lumière cohérente largement accordables reposant sur l'interaction paramétrique de trois champs dans un cristal non-linéaire. Leur utilité est aussi bien liée à cette accordabilité (spectroscopie) qu'aux propriétés quantiques propres au système (génération d'états comprimés, photons jumeaux). D'autre part, en tant que systèmes non-linéaires, les OPO sont susceptibles de présenter une grande richesse de phénomènes dynamiques temporels et spatio-temporels. Nous présentons une étude expérimentale, théorique et numérique de

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10

Schwabedal, Justus Tilmann Caspar. "Phase dynamics of irregular oscillations." Phd thesis, Universität Potsdam, 2010. http://opus.kobv.de/ubp/volltexte/2011/5011/.

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In der vorliegenden Dissertation wird eine Beschreibung der Phasendynamik irregulärer Oszillationen und deren Wechselwirkungen vorgestellt. Hierbei werden chaotische und stochastische Oszillationen autonomer dissipativer Systeme betrachtet. Für eine Phasenbeschreibung stochastischer Oszillationen müssen zum einen unterschiedliche Werte der Phase zueinander in Beziehung gesetzt werden, um ihre Dynamik unabhängig von der gewählten Parametrisierung der Oszillation beschreiben zu können. Zum anderen müssen für stochastische und chaotische Oszillationen diejenigen Systemzustände identifiziert werde

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11

Jentsch, L., and D. Natroshvili. "Thermoelastic Oscillations of Anisotropic Bodies." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199800871.

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The generalized radiation conditions at infinity of Sommerfeld-Kupradze type are established in the theory of thermoelasticity of anisotropic bodies. Applying the potential method and the theory of pseudodifferential equations on manifolds the uniqueness and existence theorems of solutions to the basic three-dimensional exterior boundary value problems are proved and representation formulas of solutions by potential type integrals are obtained.

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12

Rorrer, Ronald Alvin Lee. "Frictional oscillations in elastomeric sliding." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134509/.

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13

Balmforth, N. J. "The theory of stellar oscillations." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358576.

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14

Selbach, Arndt. "Flames with imposed air oscillations." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326245.

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15

Roopun, Anita Kumari. "Cortical network oscillations in vitro." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426852.

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16

Colenso, Richard Arthur. "Simulations of neocortical columnar oscillations." Thesis, Open University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412407.

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17

Fox, Sarah. "Oscillations memory and Alzheimer's disease." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/oscillations-memory-and-alzheimers-disease(bbacb2f0-74f3-4071-b02f-19c0c5570227).html.

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Abstract (sommario):

Damage precipitating cognitive decline in Alzheimer's disease (AD) begins long before behavioural alterations become clinically apparent. At this prodromal stage, communication between networks of neurons connecting different brain regions starts to break down; setting in motion a chain of events leading to clinical AD. A significant challenge facing Alzheimer's researchers today is finding a cheap, easy-to-perform test capable of detecting prodromal AD. Such a test would afford significant benefits to patients, including a chance of early intervention. Perhaps, more importantly, it would also

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18

Evesque, Stéphanie Marie-Noelle. "Adaptive control of combustion oscillations." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620985.

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19

Granqvist, Emma. "Patterns of symbiotic calcium oscillations." Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/42339/.

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20

Keer, Lucy. "Neutron star oscillations from starquakes." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/363269/.

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Glitches are sudden increases in the otherwise extremely regular spin rate of pulsars. One theory proposed to account for these glitches is the starquake model, in which the spinup is caused by a sudden rearrangement of the neutron star crust. Starquakes can be expected to excite some of the oscillation modes of the neutron star. These oscillations are of interest as a source of gravitational waves, and may also modify the pulsar radio emission. In this thesis we develop a toy model of the starquake and calculate which modes of the star are excited. We start by making some order-of-magnitude u

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21

Conrad, Emery David. "Mathematical Models of Biochemical Oscillations." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/32781.

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The goal of this paper is to explain the mathematics involved in modeling biochemical oscillations. We first discuss several important biochemical concepts fundamental to the construction of descriptive mathematical models. We review the basic theory of differential equations and stability analysis as it relates to two-variable models exhibiting oscillatory behavior. The importance of the Hopf Bifurcation will be discussed in detail for the central role it plays in limit cycle behavior and instability. Once we have exposed the necessary mathematical framework, we consider several specific mode

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22

Allen, Sue. "Rapid oscillations in cataclysmic variables." Master's thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/16374.

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Bibliography: pages 103-117.<br>Coherent and quasi-periodic rapid oscillations have been seen in the optical and X-ray light curves of more than 30 cataclysmic variables to date. The observational characteristics of these oscillations are reviewed, and current models discussed. To put the observations in context, a detailed review is given of the canonical model of cataclysmic variables and the variations that give rise to its various sub-classes. Observations of two systems of particular interest are presented, and their contributions to the modelling of rapid oscillations are discussed. High

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23

Nakagawa-Yoshikawa, Harunori. "Instabilités des interfaces sous oscillations." Paris 6, 2006. http://www.theses.fr/2006PA066303.

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24

Houbad, Mekki. "Oscillations, feuilletages, lois de Burger." Rennes 1, 2010. http://www.theses.fr/2010REN1S099.

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On présente dans ce mémoire de thèse quelques résultats nouveaux relevant du domaine de l’optique géométrique non linéaire sur-critique. Le cadre est fourni par les systèmes de type Burger en présence d’une contrainte de divergence nulle. On obtient dans ce contexte une classification complète de toutes les oscillations de grande amplitude qui sont localement solutions d’Euler incompressible (sans pression). Ces solutions sont principalement caractérisées par la nilpotence des matrices Jacobiennes associées. Notre approche repose sur une analyse BKW atypique dont un des ressorts est une bonne

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25

Rönnqvist, Kim. "Multimodal characterisation of sensorimotor oscillations." Thesis, Aston University, 2013. http://publications.aston.ac.uk/19564/.

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The studies in this project have investigated the ongoing neuronal network oscillatory activity found in the sensorimotor cortex using two modalities: magnetoencephalography (MEG) and in vitro slice recordings. The results have established that ongoing sensorimotor oscillations span the mu and beta frequency region both in vitro and in MEG recordings, with distinct frequency profiles for each recorded laminae in vitro, while MI and SI show less difference in humans. In addition, these studies show that connections between MI and SI modulate the ongoing neuronal network activity in these areas.

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26

Mönke, Gregor. "Stochastic oscillations in living cells." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17211.

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In dieser Arbeit werden zwei intrazelluläre Signalwege, betreffend den Tumorsuppressor p53 und das Signalmolekül Ca2+ , diskutiert und modelliert. Einzelzellmessungen des Tumorsuppressors p53 zeigen pulsatile Antwor- ten nach Zufügung von DNA Doppelstrangbrüchen (DSBs). Außer für sehr hohe Schadensdosen, ist das zeitliche auftreten dieser Pulse unregelmäßig. Mithilfe eines Wavelet basierten Pulsdetektors werden die einzelzell Trajek- torien untersucht und die inter-Puls Intervall (IPI) Verteilungen extrahiert. Diese weisen auf nicht-oszillatorische Regime in den Daten hin. Die Theorie

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27

Mirandés, Rivera Estefania de. "Bloch oscillations of ultracold atoms." Paris 6, 2006. http://www.theses.fr/2006PA066622.

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28

Vidal, Alexandre. "Relaxation et oscillations en salves." Paris 6, 2007. http://www.theses.fr/2007PA066670.

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Les oscillations en salves apparaissent dans de nombreux systèmes biologiques, physiologiques et écologiques. Elles se caractérisent par l’alternance de phases dites silencieuses ou quiescentes séparées par des phases dites actives ou pulsatiles. Cette thèse est consacrée à l'analyse mathématique des systèmes dynamiques lents-rapides proposés pour la modélisation des oscillations en salves. Grâce à la théorie des bifurcations, la théorie des perturbations singulières et l’utilisation d’éclatements à paramètres, nous caractérisons les différents comportements de tels systèmes. En particulier, n

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29

Wilquet, Gaston. "Masses, mélange et oscillations de neutrinos." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211058.

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Une revue générale est faite de la situation expérimentale concernant la mesure des masses, du mélange et des oscillations de neutrinos, ainsi que de la phénoménologie sous-jacente. Mes contributions à travers le programme expérimental du CERN, CHARM-II, CHORUS et OPERA, font l'objet d'un développement particulier. Le dernier chapitre tente de mettre en perspective le programme expérimental à moyen et long terme.<p><p>The experimental situation concerning the measurements of neutrinos masses, mixing and oscillation is reviewed, as well as of the underlying phenomenology. A particular attention

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30

Chang, Tien Fu. "Wave-induced oscillations in arbitrary harbours." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0006/MQ31552.pdf.

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31

Dendis, Alexandros. "Oscillations of a multi-string pendulum." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Jun%5FDendis.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2007.<br>Thesis Advisor(s): Fotis Papoulias. "June 2007." Description based on title screen as viewed on August 13, 2007. Includes bibliographical references (p. 133). Also available in print.

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32

Bell, Nicole F. "Neutrino oscillations and the early universe /." Connect to thesis, 2000. http://eprints.unimelb.edu.au/archive/00000697.

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33

Ugueto, Luis. "Experimental study of density waves oscillations." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22654.

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Nowadays, systems based on convective boiling flows are found in a wide variety of industrial applications, such as boiling water reactors, boilers, thermosiphons, heat exchangers, condenser, chemical reactors and some other chemical process units. Such systems take advantage of the high heat transfer rates that a boiling fluid can reach at moderate temperature differences. However, those systems are unfortunately susceptible to thermally induced two-phase flow instabilities, such as Density Wave Oscillations. Thereby, the aim of present research is to perform an experimental investigation on

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34

De, Zilwa Shane Ranel Noel. "Combustion oscillations in sudden-expansion flows." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322706.

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35

Robertson, David. "Transverse oscillations of interacting coronal loops." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538010.

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36

Tullet, Peter Francis. "ULF oscillations in the terrestrial magnetosphere." Thesis, Lancaster University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543976.

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37

Schwartzman, David John. "The Functional Role of Gamma Oscillations." Thesis, Oxford Brookes University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515265.

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38

Wilsch, Anna. "Neural oscillations in auditory working memory." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-177313.

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The present thesis investigated memory load and memory decay in auditory working memory. Alpha power as a marker for memory load served as the primary indicator for load and decay fluctuations hypothetically reflecting functional inhibition of irrelevant information. Memory load was induced by presenting auditory signals (syllables and pure-tone sequences) in noise because speech-in-noise has been shown before to increase memory load. The aim of the thesis was to assess with magnetoencephalography whether a-priori temporal expectations for the onset-time of a to-be-remembered stimulus reduces

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39

Elevant, Jessica. "CP-violation in Supernova Neutrino Oscillations." Thesis, Linköpings universitet, Teoretisk Fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-109922.

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It is astonishing both how little and how much we know about neutrinos. On one hand, the neutrino is the second most abundant particle in our Universe. Neutrinos may be created in the Sun, core collapse supernovae, cosmic rays, geological background radiation, supernova remnants and in the Big Bang. On the other hand, they have unimaginably small masses and are unwilling to react with their surroundings. Because of their abundance and their inclination to show us physics beyond the standard model of particle physics, neutrinos are hoped to carry yet unknown information of the Universe. However

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40

Wilson, Sean Odell. "Nonlinear oscillations of a triatomic molecule." Thesis, Monterey California. Naval Postgraduate School, 2002. http://hdl.handle.net/10945/5664.

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Approved for public release; distribution is unlimited<br>ude decreases if the difference of the frequency of the two modes is reduced. We consider the simplest case of a symmetric rectilinear molecule where the coupling has a cubic nonlinearity in addition to a linear restoring force. Approximate analytical results are in good agreement with numerical simulations of the exact equations of motion, although in some cases the actual behavior fundamentally deviates from the perturbative theory. Two physical demonstrations of the instability are described, where the apparatus are a system of glide

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41

Jörg, David Josef. "Genetic Oscillations and Vertebrate Embryonic Development." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-159034.

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Recurrent processes are a general feature of living systems, from the cell cycle to circadian day-night rhythms to hibernation and flowering cycles. During development and life, numerous recurrent processes are controlled by genetic oscillators, a specific class of genetic regulatory networks that generates oscillations in the level of gene products. A vital mechanism controlled by genetic oscillators is the rhythmic and sequential segmentation of the elongating body axis of vertebrate embryos. During this process, a large collection of coupled genetic oscillators gives rise to spatio-temporal

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42

Lawrence, Yvonne Millicent. "Intracellular calcium oscillations in mouse oocytes." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240642.

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43

Grosart, Kirsty. "Oscillations and stability of rotating superfluids." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433829.

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44

Kohutova, Petra. "Magnetohydrodynamic oscillations in solar coronal rain." Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/106944/.

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Coronal rain composed of cool plasma condensations falling from coronal heights along magnetic field lines is a phenomenon occurring in active region coronal loops. This work combines high-resolution observations and numerical simulations to understand the interplay between coronal rain and MHD oscillations. We analyse oscillations and kinematics of the coronal rain using high resolution observations. Two different regimes of transverse oscillations traced by the rain are detected: smallscale persistent oscillations driven by a continuously operating process and localized large-scale oscillati

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45

Yang, Qian. "Oscillations in stochastic multi-species interactions." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761013.

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46

Händel, Chris. "Fluctuations and Oscillations in Cell Membranes." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-200703.

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Zellmembranen sind hochspezialisierte Mehrkomponentenlegierungen, welche sowohl die Zelle selbst als auch ihre Organellen umgeben. Sie spielen eine entscheidende Rolle bei vielen biologisch relevanten Prozessen wie die Signaltransduktion und die Zellbewegung. Aus diesem Grund ist eine genaue Charakterisierung ihrer Eigenschaften der Schlüssel zum Verständnis der Bausteine des Lebens sowie ihrer Erkrankungen. Besonders Krebs steht im engen Zusammenhang mit Veränderungen der biomechanischen Eigenschaften vom Gewebe, Zellen und ihren Organellen. Während Veränderungen des Zytoskeletts von Krebszel

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47

Kuridze, D. "Magnetohydrodynamic oscillations in chromospheric fine structures." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.678708.

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This thesis presents the study of magnetohydrodynamic (MHO) waves and oscillations in quiet Sun chromospheric fine structures near the solar disk center using multiwavelength, high temporal and spatial resolution observations. Transverse oscillations in chromospheric on-disk mottles that appear to be rooted in photospheric magnetic bright points are detected with great accuracy and interpreted in terms of MHO kink waves. Measured kink wave characteristiCs, such as periods (ranging from 70 to 280 s and peak at -165-s), phase speeds 40-120-km S·l, and transverse velocity amplitudes (2-18 km S-l)

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48

Andrews, David Jeremy. "Planetary-period oscillations in Saturn's magnetosphere." Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/9995.

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This thesis is concerned with the study of near-planetary rotation period oscillations in Saturn’s magnetic field. Similar oscillations are present in a variety of other magnetospheric phenomena, most notably kilometre-wavelength radio emissions, and together they have a substantial influence throughout the Saturnian plasma environment. However, their origin remains poorly understood, despite more than a decade of study. Surprising new discoveries have been made regarding the seasonality of these oscillatory phenomena, and their intrinsic connection to the high-latitude upper atmosphere and io

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49

Burley, Jonathan Mark Anderson. "Magmatism and glacial cycles : coupled oscillations?" Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:c55a6d98-d222-46de-8500-1ad44d05be75.

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The Earth's climate system is driven by varying insolation from the Sun. The dominant variations in insolation are at 23 and 40 thousand year periods, yet for the past million years the Earth's climate has glacial cycles at approximately 100 kyr periodicity. These cycles are a coupled variation in temperature, ice volume, and atmospheric CO<sub>2</sub>. Somehow the Earth system's collective response to 23 and 40 kyr insolation forcing produces 100 kyr glacial-interglacial cycles. Generally it has been assumed that the causative mechanisms are a combination of ice dynamics (high ice reflectivit

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Smith, Thomas Charles Brannam. "Thermally driven oscillations in dynamic applications." Thesis, University of Cambridge, 2006. https://www.repository.cam.ac.uk/handle/1810/284059.

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