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Teses / dissertações sobre o tema "Temporal oscillators"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 14 de fevereiro de 2022

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1

Camacho, Lopez Santiago. "Spatio-temporal dynamics of nonlinear volume gratings for holographic laser oscillators." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311942.

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2

Ng, Li Huang Honey. "Evaluating models of verbal serial short-term memory using temporal grouping phenomena." University of Western Australia. School of Psychology, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0059.

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[Truncated abstract] Various capabilities such as the ability to read or conduct a conversation rely on our ability to maintain and recall information in the correct order. Research spanning more than a century has been devoted to understanding how units of information are retained in order in short-term memory. The nature of the mechanisms that code the positions of items in serial short-term verbal recall can be investigated by examining a set of phenomena that can be termed temporal grouping effects. Inserting extended pauses to break a list of verbal items into sub-lists (e.g. SHD-QNR-BJF,

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3

Kosem, Anne. "Cortical oscillations as temporal reference frames for perception." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2014. http://tel.archives-ouvertes.fr/tel-01069219.

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The timing of sensory events is a crucial perceptual feature, which affects both explicit judgments of time (e.g. duration, temporal order) and implicit temporal perception (e.g. movement, speech). Yet, while the relative external timing between events is commonly evaluated with a clock in physics, the brain does not have access to this external reference. In this dissertation, we tested the hypothesis that the brain should recover the temporal information of the environment from its own dynamics. Using magnetoencephalography (MEG) combined with psychophysics, the experimental work suggests th

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4

Han, Biao. "Predictive coding : its spike-time based neuronal implementation and its relationship with perception and oscillations." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30029/document.

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Dans cette thèse, nous avons étudié le codage prédictif and sa relation avec la perception et les oscillations. Nous avons, dans l'introduction, fait une revue des connaissances sur les neurones et le néocortex et un état de l'art du codage prédictif. Dans les chapitres principaux, nous avons tout d'abord, proposé l'idée, au travers d'une étude théorique, que la temporalité de la décharge crée une inhibition sélective dans les réseaux excitateurs non-sélectifs rétroactifs. Ensuite, nous avons montré les effets perceptuels du codage prédictif: la perception de la forme améliore la perception du

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5

Chorley, N. "Spatial and temporal analysis of sunspot oscillations." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/47200/.

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Sunspots are the most conspicuous feature seen on the solar photosphere and are manifestations of the solar magnetic field. Their study, then, may provide us with a greater understanding of the dynamo mechanism thought to be responsible for the generation of this field. In this thesis, the oscillations of sunspots are studied by making use of observational data from two instruments: the Nobeyama Radioheliograph (NoRH) and the Solar Optical Telescope (SOT) on board the Hinode spacecraft. First, a study of long period oscillations was undertaken in which two long period peaks (P > 10 min) were i

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6

Adhimoolam, Balaji. "Diode-oscillator fiber-amplifier systems: versatile, high power spectro-temporal control." Enschede : University of Twente [Host], 2006. http://doc.utwente.nl/57343.

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7

Khalid, Benyaich. "Bistability, temporal oscillations and Turing patterns in a spatial reactor." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210948.

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8

Michelmann, Sebastian. "Temporal dynamics and mechanisms of oscillatory pattern reinstatement in human episodic memory." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8489/.

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A fundamental question in the investigation of episodic memory is how the human brain represents information from the past. This thesis introduces a new method that tracks content specific representations in rhythmic fluctuations of brain activity (i.e. brain oscillations). It is demonstrated that a frequency band centred at 8 Hz carries information about remembered stimulus content. This is shown in human electrophysiological recordings during episodic memory formation and retrieval. Strong and sustained power decreases consistently mark this 8 Hz frequency band; successful memory encoding an

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9

Webb, Dominic-Luc. "Temporal monitoring of intracellular Ca²⁺ signaling and origins of Ca²⁺ oscillations /." Stockholm, 2006. http://diss.kib.ki.se/2006/91-7140-741-3/.

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10

Vincent-Lamarre, Philippe. "Learning Long Temporal Sequences in Spiking Networks by Multiplexing Neural Oscillations." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39960.

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Many living organisms have the ability to execute complex behaviors and cognitive processes that are reliable. In many cases, such tasks are generated in the absence of an ongoing external input that could drive the activity on their underlying neural populations. For instance, writing the word "time" requires a precise sequence of muscle contraction in the hand and wrist. There has to be some patterns of activity in the areas of the brain responsible for this behaviour that are endogenously generated every time an individual performs this action. Whereas the question of how such neural code i

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11

Ouedraogo, Wendpagnagde david. "Impact de l'oscillation lente corticale sur l'activité des cellules granulaires du gyrus denté dans un modèle animal d'épilepsie du lobe temporal." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4047.

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En plus des crises, les patients atteints d'épilepsie du lobe temporale (ELT) souffrent de déficits cognitifs tels que des troubles de l'apprentissage et de la mémoire épisodique. La formation de la mémoire épisodique nécessite des interactions entre le cortex et l'hippocampe pendant le sommeil. Ces interactions sont orchestrées par l'oscillation lente qui est générée dans le réseau thalamocortical. L'oscillation lente se propage dans d'autres structures sous corticales mais l'hippocampe semble être moins influencé. Cela pourrait être du à la fonction de filtre du gyrus denté. Dans l'ELT, le g

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12

Brusch, Lutz. "Complex Patterns in Extended Oscillatory Systems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2001. http://nbn-resolving.de/urn:nbn:de:swb:14-1006416783250-74051.

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Ausgedehnte dissipative Systeme können fernab vom thermodynamischen Gleichgewicht instabil gegenüber Oszillationen bzw. Wellen oder raumzeitlichem Chaos werden. Die komplexe Ginzburg-Landau Gleichung (CGLE) stellt ein universelles Modell zur Beschreibung dieser raumzeitlichen Strukturen dar. Diese Arbeit ist der theoretischen Analyse komplexer Muster gewidmet. Mittels numerischer Bifurkations- und Stabilitätsanalyse werden Instabilitäten einfacher Muster identifiziert und neuartige Lösungen der CGLE bestimmt. Modulierte Amplitudenwellen (MAW) und Super-Spiralwellen sind Beispiele solcher kompl

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13

Santos, Bruno Andre. "Temporal structure of neural oscillations underlying sensorimotor coordination : a theoretical approach with evolutionary robotics." Thesis, University of Sussex, 2013. http://sro.sussex.ac.uk/id/eprint/46174/.

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The temporal structure of neural oscillations has become a widespread hypothetical \mechanism" to explain how neurodynamics give rise to neural functions. Despite the great number of empirical experiments in neuroscience and mathematical and computa- tional modelling investigating the temporal structure of the oscillations, there are still few systematic studies proposing dynamical explanations of how it operates within closed sensorimotor loops of agents performing minimally cognitive behaviours. In this thesis we explore this problem by developing and analysing theoretical models of evolutio

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14

Heideman, Simone. "Dynamics of temporal anticipation in perception and action." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:98dde64e-11ea-4516-af8c-5f4707d52907.

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The selective deployment of attention over time optimises our perception and action at the moments when relevant events are expected to happen. Such "temporal orienting" to moments when something is going to happen is especially useful when this information can be combined with predictions about where and what events are likely to occur. A large body of research has already established how temporal predictions dynamically influence our perception and action, but questions remain regarding the neural bases of these attentional mechanisms. In this thesis I present three magnetoencephalography (M

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15

Clastres, Xavier. "Codage temporel de l'information visuelle dans les réseaux neuro-mimétiques." Toulouse 3, 2000. http://www.theses.fr/2000TOU30211.

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16

Rohenkohl, Gustavo. "Temporal orienting in the human brain : neural mechanisms of control and modulation." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:95d78d46-6398-48ce-8ff9-30b4fd192e3f.

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The main aim of the experiments reported in this thesis was to explore the neural mechanisms underlying the temporal orienting of attention. In Chapter 3, I explored the possible dissociation between exogenous and endogenous temporal orienting by comparing reaction times to targets appearing after rhythmic or symbolic cues. Behavioural results provided evidence for the existence of dissociable exogenous and endogenous types of temporal orienting of attention. The experiment in Chapter 4 combined spatiotemporal expectations using rhythmic moving cues to test the modulatory effect of exogenous t

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17

Dupont, Geneviève. "Spatio-temporal organization of cytosolic Ca2+ signals: a modelling approach to the molecular mechanisms and physiological implications of Ca2+ oscillations and waves." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210912.

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18

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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19

DECCO, CLAUDIA C. G. "Analise temporal das oscilacoes espaciais de xenonio em reatores de pequeno porte." reponame:Repositório Institucional do IPEN, 1997. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10683.

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Made available in DSpace on 2014-10-09T12:43:00Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:07:51Z (GMT). No. of bitstreams: 1 05404.pdf: 2708504 bytes, checksum: 1041726f601369567f34c17cf8a9d296 (MD5)<br>Dissetacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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20

Willis-Ott, Christina. "Ytterbium-doped fiber-seeded thin-disk master oscillator power amplifier laser system." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5890.

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Lasers which operate at both high average power and energy are in demand for a wide range of applications such as materials processing, directed energy and EUV generation. Presented in this dissertation is a high-power 1 ?m ytterbium-based hybrid laser system with temporally tailored pulse shaping capability and up to 62 mJ pulses, with the expectation the system can scale to higher pulse energies. This hybrid system consists of a low power fiber seed and pre-amplifier, and a solid state thin-disk regenerative amplifier. This system has been designed to generate high power temporally t

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21

Hoyos, Jorge Jaramillo. "Temporal patterns of spiking activity in the hippocampal formation." Doctoral thesis, Humboldt-Universität zu Berlin, Lebenswissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17111.

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Um eine Folge von Ereignissen aus unserem Gedächtnis abzurufen, ist zunächst ein Mechanismus erforderlich, der geordnete Sequenzen abspeichert. Hierbei stehen wir vor dem Problem, dass Ereignisse in unserem Leben auf einer Zeitskala von Sekunden oder mehr stattfinden. Auf der anderen Seite basiert das Lernen von Sequenzen auf der Plastizität von Synapsen im Gehirn, die durch die Abfolge von Aktionspotentialen von Nervenzellen im Millisekunden-Bereich gesteuert wird. Um dieses zeitliche Problem zu lösen, betrachten wir den Hippocampus, eine Struktur im Gehirn von Vertebraten, die für das expli

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22

Mariote, Leonardo Elias. "Mineração de series temporais de dados de sensores." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276076.

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Orientador: Claudia Maria Bauzer Medeiros<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Computação<br>Made available in DSpace on 2018-08-11T15:55:05Z (GMT). No. of bitstreams: 1 Mariote_LeonardoElias_M.pdf: 1035887 bytes, checksum: 094c91408f53fdbaaa175f5b7206a2d7 (MD5) Previous issue date: 2008<br>Resumo: Redes de sensores têm aumentado a quantidade e variedade de dados temporais disponíveis. Com isto, surgiram novos desafios na definição de novas técnicas de mineração, capazes de descrever características distintas em séries temporais. A literatura correlata

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23

Dubois, Julien. "Percevoir le monde sous le stroboscope attentionnel : Études psychophysiques et électroencéphalographiques." Phd thesis, Université Paul Sabatier - Toulouse III, 2011. http://tel.archives-ouvertes.fr/tel-00619137.

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Notre expérience du monde est fluide, continue. Pourtant, elle pourrait reposer sur un échantillonage discret, par l'attention, de l'information sensorielle entrante. Sous illumination continue un observateur portant attention à une roue à rayons en rotation peut percevoir des inversions illusoires; ceci semble être un artéfact d'aliasing temporel, suggérant que la perception du mouvement par l'attention utilise des échantillons. Nous avons cherché des signes d'aliasing dans d'autres tâches, mais avons rencontré des obstacles pratiques. La périodicité présumée de l'attention nous a mené à préd

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24

Marins, Carlos Nazareth Motta. "Sistema e processo para geração, sincronização remota e comparação de sinais temporais precisos." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260829.

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Orientadores: Jacobus Willibrordus Swart, Pierre Kaufmann<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-16T16:19:31Z (GMT). No. of bitstreams: 1 Marins_CarlosNazarethMotta_D.pdf: 3218841 bytes, checksum: 93bb7dd5ba9269c6004bfb826f4c53fc (MD5) Previous issue date: 2010<br>Resumo: Nesta tese foram propostas, analisadas e implementadas soluções completas de sistemas para disseminação de referência temporal com alta resolução através de enlaces de rádio tendo como foco o atendimento das necessidade

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25

Buchin, Anatoly. "Modeling of single cell and network phenomena of the nervous system : ion dynamics during epileptic oscillations and inverse stochastic resonance." Thesis, Paris, Ecole normale supérieure, 2015. http://www.theses.fr/2015ENSU0041/document.

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Dans cette thèse nous avons utilisé des méthodes de systèmes dynamiques et des simulations numériques pour étudier les mécanismes d'oscillations d'épilepsie associés à des concentrations d’ions dynamiques et au comportement bimodal des cellules Purkinje du cervelet. Le propos général de ce travail est l'interaction entre les propriétés intrinsèques des neurones simple et la structure d'entrée synaptique contrôlant l'excitabilité neuronale. Dans la première partie de la thèse nous avons développé un modèle de transition de crise épileptique dans le lobe temporal du cerveau. Plus précisément nou

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26

Fanuel, Lison. "Mesurer et améliorer le maintien en mémoire de travail chez les adultes jeunes et âgés : mesures comportementales et électrophysiologiques." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE2098/document.

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Au cœur de la plupart de nos activités quotidiennes, la mémoire de travail est une fonction cognitive permettant de maintenir des informations à court terme tout en traitant d’autres informations (Atkinson & Shiffrin, 1968 ; Baddeley & Hitch, 1974). Différents modèles s’accordent sur le rôle central de l’attention dans la mémoire de travail, notamment via un mécanisme de maintienspécifique : le rafraîchissement attentionnel (Johnson, 1992). La présente thèse s’est intéressée à ce mécanisme encore assez mal connu chez des populations jeunes et âgées.La mémoire de travail de travail semb

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27

Wittenberg, Marc André [Verfasser], Alfons [Gutachter] Schnitzler, and Christian [Gutachter] Bellebaum. "Investigating the Role of Neuronal Oscillations in Tactile Temporal Perception using Magnetoencephalography and Transcranial Alternating Current Stimulation / Marc André Wittenberg ; Gutachter: Alfons Schnitzler, Christian Bellebaum." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2021. http://d-nb.info/1236753577/34.

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Silva, Anderson Brito da. "Revisitando o eletrocorticograma intra-operat?rio na epilepsia mesial do lobo temporal: relev?ncia das oscila??es de alta frequ?ncia." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17030.

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Made available in DSpace on 2014-12-17T15:28:53Z (GMT). No. of bitstreams: 1 AndersonBS_DISSERT.pdf: 4240084 bytes, checksum: 0331343a1aab5e54d0d9cb6baeccb72d (MD5) Previous issue date: 2013-12-13<br>Epilepsies are neurological disorders characterized by recurrent and spontaneous seizures due to an abnormal electric activity in a brain network. The mesial temporal lobe epilepsy (MTLE) is the most prevalent type of epilepsy in adulthood, and it occurs frequently in association with hippocampal sclerosis. Unfortunately, not all patients benefit from pharmacological treatment (drug-resistant pa

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29

Jochaut-Roussillon, Delphine. "Analyse comparée de la pathologie du traitement temporel auditif dans les troubles du spectre autistique et la dyslexie." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066723/document.

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Cette thèse a eu pour objectif de contribuer à la compréhension de deux troubles du langage: ceux associés aux troubles du spectre autistique et la dyslexie. Les récentes avancées sur les mécanismes neuraux de segmentation acoustique du signal de parole indiquent le rôle majeur des oscillations qui offrent des fenêtres d'intégration temporelle à l'échelle de la syllabe et du phonème, unités linguistiques ayant un sens. À l'aide d'enregistrements simultanés d'EEG et d'IRM fonctionnelle durant la visualisation d'un film et au repos, nous avons étudié les rythmes corticaux auditifs et leur topogr

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Farias, Kelly Soares. "Interferindo com oscila??es de alta frequ?ncia no hipocampo epil?ptico: consequ?ncias para as crises espont?neas." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17024.

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Made available in DSpace on 2014-12-17T15:28:52Z (GMT). No. of bitstreams: 1 KellySF_DISSERT.pdf: 3939064 bytes, checksum: 5be69492fa857ba043776a01195d92b4 (MD5) Previous issue date: 2012-09-21<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>Crises epil?pticas s?o eventos parox?sticos do sistema nervoso central (SNC) caracterizadas por uma descarga el?trica neuronal anormal, com ou sem perda de consci?ncia e com sintomas cl?nicos variados. Nas epilepsias do lobo temporal as crises tem in?cio focal, em estruturas do sistema l?mbico. Dados cl?nicos e experimentais mostram q

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Devalle, Federico. "Collective phenomena in networks of spiking neurons with synaptic delays." Doctoral thesis, Universitat Pompeu Fabra, 2019. http://hdl.handle.net/10803/666912.

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A prominent feature of the dynamics of large neuronal networks are the synchrony-driven collective oscillations generated by the interplay between synaptic coupling and synaptic delays. This thesis investigates the emergence of delay-induced oscillations in networks of heterogeneous spiking neurons. Building on recent theoretical advances in exact mean field reductions for neuronal networks, this work explores the dynamics and bifurcations of an exact firing rate model with various forms of synaptic delays. In parallel, the results obtained using the novel firing rate model are compared with e

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Cenier, Tristan. "Interactions entre rythmes rapides et rythmes lents dans la représentation de l’information olfactive dans le réseau bulbaire." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10093/document.

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Une particularité de la modalité sensorielle olfactive est la nature complexe du stimulus chimique à représenter. Les cellules sensorielles de la cavité nasale sont sensibles aux traits physico-chimiques des molécules et transmettent cette information vers le bulbe olfactif, premier relais central de cette modalité. L’organisation des voies de projection vers le bulbe entraîne une spatialisation de l’activité dans cette structure, ce qui constitue un mode de représentation de l’information mais qui n’est pas suffisant à lui seul. Le bulbe olfactif est également marqué par des phénomènes dynami

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Malvestio, Irene. "Detection of directional interactions between neurons from spike trains." Doctoral thesis, Universitat Pompeu Fabra, 2019. http://hdl.handle.net/10803/666226.

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An important problem in neuroscience is the assessment of the connectivity between neurons from their spike trains. One recent approach developed for the detection of directional couplings between dynamics based on recorded point processes is the nonlinear interdependence measure L. In this thesis we first use the Hindmarsh-Rose model system to test L in the presence of noise and for different spiking regimes of the dynamics. We then compare the performance of L against the linear cross-correlogram and two spike train distances. Finally, we apply all measures to neuronal spiking data fr

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DORNELLES, Leonardo Dalla Porta. "Oscilações coletivas e avalanches em redes de neurônios estocásticos." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18384.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2017-03-08T13:00:17Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertacao_LeonardoDallaPorta.pdf: 4244662 bytes, checksum: 214ab17f2ee3583441af553e0a0a7931 (MD5)<br>Made available in DSpace on 2017-03-08T13:00:17Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertacao_LeonardoDallaPorta.pdf: 4244662 bytes, checksum: 214ab17f2ee3583441af553e0a0a7931 (MD5) Previous issue date: 2016-10-06<br>FACEPE<br>Avala

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Gouzien, Élie. "Optique quantique multimode pour le traitement de l'information quantique." Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4110.

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Cette thèse étudie l’optique quantique multimode, aussi bien du point de vue de la génération que celui de la détection. Elle s’articule autour de trois volets. Nous étudions la génération de lumière comprimée multimode dans une cavité. Pour cela nous considérons la forme la plus générale de hamiltonien quadratique, permettant entre autres de décrire l’utilisation de plusieurs pompes dans un matériau effectuant du mélange à quatre ondes. Une approche combinant fonctions de Green et décompositions de matrices symplectiques est décrite. Cette théorie générique est appliquée à des cas particulier

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Shende, Vikram Ravindra 1982. "MicroRNAs Function as Cis- and Trans- Acting Modulators of Clock Gene Expression in SCN and Peripheral Circadian Oscillators." Thesis, 2012. http://hdl.handle.net/1969.1/148183.

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The circadian system in mammals is arranged as a hierarchical network of oscillators, with the master pacemaker of circadian rhythms located in the suprachiasmatic nuclei (SCN) of the hypothalamus and peripheral oscillators in most other organ and tissue systems of the body. The molecular machinery responsible for generating circadian rhythms is composed of interlocked transcriptional-translational feedback loops with the gene Brain Muscle Arnt-like 1 (Bmal1) functioning as a core positive regulator. Using the mouse, Mus musculus as a model system, we studied the post-transcriptional mechanism

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Dempsey, Donna Lynn. "Observations of dayside magnetopause oscillations and concurrent temporal variations in cusp precipitation." Thesis, 1999. http://hdl.handle.net/1911/19371.

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On April 13, 1996, while Russia's Interball Tail spacecraft was travelling through the dayside magnetosheath, NASA's Polar spacecraft traversed the northern cusp. Transients observed in the data from the Interball Tail/SCA-1 particle instrument are shown to be multiple crossings of the magnetopause. Analysis of data from the SCA-1 instrument and magnetic field data from the MIF instrument shows quasi-periodic motions of the magnetopause. Simultaneous observations of changes in cusp precipitation by the Polar/TIDE instrument and changes in the He2+/H+ density ratio in the cusp by the Polar/TIMA

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Ferrandez, Roxanne. "Profil temporel de l’efficacité du traitement visuel en reconnaissance d’objets et de visages." Thèse, 2019. http://hdl.handle.net/1866/23828.

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Les variations d’efficacité du traitement visuel dans le temps ont été étudiées par échantillonnage temporel aléatoire. Vingt-quatre adultes ont identifié des stimuli composés de bruit blanc visuel et d’images d’objets familiers (expérience 1) ou de visages célèbres (expérience 2). Le ratio signal-bruit variait à travers le temps selon des fonctions d’échantillonnage générées par l’intégration d’ondes sinusoïdales de différentes fréquences (5 à 55 Hz) et de phases et amplitudes aléatoires. Des vecteurs de classification (VC) temporels ont été calculés en soustrayant la somme pondérée des ratio

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Bahmer, Andreas [Verfasser]. "Computer simulation of chopper neurons : intrinsic oscillations and temporal processing in the auditory system / von Andreas Bahmer." 2007. http://d-nb.info/98417639X/34.

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Händel, Chris. "Fluctuations and Oscillations in Cell Membranes." Doctoral thesis, 2015. https://ul.qucosa.de/id/qucosa%3A14612.

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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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Calvo, Hernán Laureano. "Time-reversal focusing and space-time control of interferences :." Doctoral thesis, 2010. http://hdl.handle.net/11086/137.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2010.<br>La focalización de ondas acústicas que se propagan por un medio inhomogéneo fue lograda con éxito a través del procedimiento conocido como espejo de reversión temporal (TRM). En este experimento, las ondas salientes son almacenadas al cruzar la frontera entre una región denominada cavidad y el espacio de propagación libre y luego son reemitidas para lograr la reversión en el tiempo. Sorpresivamente, esta simple prescripción permite recuperar la excitación inicial con gran precisión

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Castellano, Marta. "Computational Principles of Neural Processing: modulating neural systems through temporally structured stimuli." Doctoral thesis, 2014. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2014121112959.

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In order to understand how the neural system encodes and processes information, research has focused on the study of neural representations of simple stimuli, paying no particular attention to it's temporal structure, with the assumption that a deeper understanding of how the neural system processes simpli fied stimuli will lead to an understanding of how the brain functions as a whole [1]. However, time is intrinsically bound to neural processing as all sensory, motor, and cognitive processes are inherently dynamic. Despite the importance of neural and stimulus dynamics, little is known of ho

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Suryawanshi, Anup Arvind. "Uncertainty Quantification in Flow and Flow Induced Structural Response." Thesis, 2015. http://etd.iisc.ernet.in/2005/3875.

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Response of flexible structures — such as cable-supported bridges and aircraft wings — is associated with a number of uncertainties in structural and flow parameters. This thesis is aimed at efficient uncertainty quantification in a few such flow and flow-induced structural response problems. First, the uncertainty quantification in the lift force exerted on a submerged body in a potential flow is considered. To this end, a new method — termed here as semi-intrusive stochastic perturbation (SISP) — is proposed. A sensitivity analysis is also performed, where for the global sensitivity analysi

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