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Dissertations / Theses on the topic 'Oscillation period'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Grác, David. "Měření momentů setrvačnosti vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231201.

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This diploma thesis is concerned with selecting the appropriate method for determining the moment of inertia to the vertical, lateral and longitudinal axis through the centre of gravity of the vehicle. Using the special mechanical device, constructed on IAE was carried out repeated measurements of known mass properties in each axis. With the aid of obtained data was calculated measurement error. To compare the resulting values was created MBS model.

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2

Toman, Josef. "Zařízení pro měření výškové polohy těžiště vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231246.

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This diploma thesis deals with measurement of vehicle centre of gravity height position. In the first part is created summary of methods used for measuring centre of gravity position and moment of inertia of the vehicle. In the other parts are designed and analyzed two dynamics method of measuring centre of gravity height position. This thesis presents analysis of the errors of the proposed methods, results of measurements and design of the construct adjustments device for measuring of the moments of inertia enabling its used for measuring centre of gravity height position. Some components are

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3

Hanych, Jaroslav. "Konstrukční návrh zařízení pro měření výškové polohy těžiště vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378015.

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This master's thesis deals with problems connected with measuring vehicle centre of gravity height. The research part summarizes generally known methods of measuring vehicle centre of gravity and moments of inertia. Essential part of this thesis is the design of a device for measuring the centre of gravity height of a road vehicle on a principle of measuring a period of oscillation. The height position of the platform of the device is adjustable through hydraulic cylinders. A stress-strain analysis of the design was executed through a combination of analytical methods and a finite element meth

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4

Kotaška, Stanislav. "Měření větrových oscilačních vln na nádrži." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391947.

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This diploma thesis deals with the measurement of wind oscillation waves on reservoirs, especially with regard to the determination of wave properties with a focus on the spectral density. The thesis presents the basics of the theory of creation and propagation of wind oscillation waves, the recherche of measuring devices and a description of the pilot measurement with the processing of measured data in the MATLAB environment using the software tool WAFO. Attached to the CD are sample scripts for data processing from the resistance sensor.

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5

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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Kubica, Petr. "Zařízení pro měření výškové polohy těžiště vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232123.

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This diploma thesis deals the with measurment of the centre of gravity height position of a road vehicle and its issues. The introduction of this thesis focuses on the determining of the position of the center of gravity and the moment of inertia of a road vehicle. The next part is about creationing of a construction plan and its verification. The thesis contains a sensitivity analysis of this device including its results. The end of the thesis informs about the executed measurment in a laboratory and about recommendations for next measurments.

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7

Lacot, Eric. "Dynamique d'un laser à fibre dopée Er3+." Grenoble 1, 1992. http://www.theses.fr/1992GRE10202.

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La dynamique d'un laser a fibre dopee er#3#+ a ete analysee aussi bien en regime de pompage continu qu'en regime de pompage module. En pompage continu, lorsque l'on augmente la puissance de pompe, le laser atteint un second seuil et une bifurcation de hopf apparait menant le laser d'un regime de fonctionnement continu a un regime de fonctionnement pulse. Une etude de l'influence des parametres aussi bien intrinseques (dopage, longueur,. . . ) que extrinseques (pompage, cavite,. . . ) nous a permis de determiner dans un espace de parametres propres au laser la frontiere entre les differents reg

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8

Clarke, Kay Elizabeth. "Magnetospheric period oscillations of Saturn’s magnetopause and bow shock." Thesis, University of Leicester, 2010. http://hdl.handle.net/2381/8313.

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In this thesis we show that Saturn’s magnetopause and bow shock oscillate with a period near that of planetary rotation that we term the ‘magnetospheric period’. In our first study, using two Cassini orbits as exemplars, we demonstrate that Saturn’s magnetopause oscillates at the magnetospheric period in response to changes in the magnetospheric pressure. The change in internal pressure required to produce such oscillations, which typically correspond to a ~10% change in the boundary radius, is estimated to be ~30-40% of the unperturbed background pressure. In our second study we develop a sim

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9

Jacobi, Christoph, Nadja Samtleben, and Gunter Stober. "Meteor radar observations of mesopause region long-period temperature oscillations." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-212263.

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Meteor radar observations of mesosphere/lower thermosphere (MLT) daily temperatures have been performed at Collm, Germany since August 2004. The data have been analyzed with respect to long-period oscillations at time scales of 2–30 days. The results reveal that oscillations with periods of up to 6 days are more frequently observed during summer, while those with longer periods have larger amplitudes during winter. The oscillations may be considered as the signature of planetary waves. The results are compared with analyses from radar wind measurements. Moreover, the temperature oscillations s

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10

Jacobi, Christoph, Rudolf Schminder, and Dierk Kürschner. "Long-period (2-18 Days) oscillations of mesopause winds at Collm." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-213040.

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Daily analyses of the zonal and meridional prevailing wind at the mesopause ( - 95 km height) are investigated with respect to planetary wave scale oscillations with periods ranging between 2 and 18 days. A mean climatology of the years 1983 - 1994 is presented. Time series of planetary wave activity show a significant increase during this period, which is in accordance with results from literature<br>Tägliche Analysen des zonalen und meridionalen Grundwindes in der Mesopausenregion (- 95 km Höhe) werden hinsichtlich planetarer Wellenaktivität im Periodenbereich von 2 bis 18 Tagen untersucht.

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Jacobi, Christoph, Rudolf Schminder, and Dierk Kürschner. "Long-period (2-18 Days) oscillations of mesopause winds at Collm." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 4 = Meteorologische Arbeiten aus Leipzig ; 2 (1996), S. 131-143, 1996. https://ul.qucosa.de/id/qucosa%3A15060.

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Daily analyses of the zonal and meridional prevailing wind at the mesopause ( - 95 km height) are investigated with respect to planetary wave scale oscillations with periods ranging between 2 and 18 days. A mean climatology of the years 1983 - 1994 is presented. Time series of planetary wave activity show a significant increase during this period, which is in accordance with results from literature.<br>Tägliche Analysen des zonalen und meridionalen Grundwindes in der Mesopausenregion (- 95 km Höhe) werden hinsichtlich planetarer Wellenaktivität im Periodenbereich von 2 bis 18 Tagen untersucht.

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Samtleben, Nadja, and Christoph Jacobi. "Long-period oscillations derived from mesosphere/lower thermosphere meteor radar temperature measurements." Universität Leipzig, 2015. https://ul.qucosa.de/id/qucosa%3A16649.

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Using measurements, derived from a meteor radar in Collm (51.3°N, 13°E), the mesopause region is analyzed with respect to the temperature distribution at an altitude of 90 km over a period of 10 years. The analyzed period lasts from 2005 till 2013. Based on these measurements, the typical temperature seasonal cycle of the mesopause region can be observed. The temperature reaches its minimum of about 130 K in summer and its maximum of about 220 K in winter. At this altitude, also strong day-today- fluctuations of up to 35 K exist, which are probably partly induced by planetary waves. Shorter-pe

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13

Fantoni, Anna. "Long-period oscillations in GPS Up time series. Study over the European/Mediterranean area." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25586/.

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The surface of the Earth is subjected to vertical deformations caused by geophysical and geological processes which can be monitored by Global Positioning System (GPS) observations. The purpose of this work is to investigate GPS height time series to identify interannual signals affecting the Earth’s surface over the European and Mediterranean area, during the period 2001-2019. Thirty-six homogeneously distributed GPS stations were selected from the online dataset made available by the Nevada Geodetic Laboratory (NGL) on the basis of the length and quality of the data series. The Principal C

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14

Menegazzi, Pamela. "The circadian clock of Drosophila going wild: PERIOD and TIMELESS oscillations under natural conditions." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3421588.

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The circadian clock of the fruit fly Drosophila melanogaster relies on 7 groups of clock neurons per brain hemisphere which are bilaterally clustered in dorsal (DN1s, DN2s and DN3s) and lateral (s-LNvs, l-LNvs, LNds and LPNs) according to their positions in the brain. In these neurons, clock genes such as period (per) and timeless (tim) operate in interlocked feed-back loops. Under rectangular 12:12 light:dark (LD) regimes and constant temperature PER and TIM proteins start to accumulate in the cytoplasm of all clock neurons in the middle of the night and reach their maximum levels at the en

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15

Salau, Opeyemi R. S. [Verfasser]. "El Niño, Southern Oscillation during the Holocene and Eemian Warm Periods / Opeyemi R. S. Salau." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1024079775/34.

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16

Herrgen, Leah. "The Regulation of Segmentation Clock Period in Zebrafish." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1228749843309-64183.

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Oscillations are present at many different levels of biological organization. The cell cycle that directs the division of individual cells, the regular depolarization of neurons in the sinu-atrial node which underlies the regular beating of the heart, the circadian rhythms that govern the daily activity cycles of virtually all organisms, and the clocks that make entire populations of fireflies flash on and off in unison feature as prominent examples of biological clocks. During development, biological clocks regulate the patterning of growing tissues, as is the case in vertebrate somitogenesis

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17

Qi, Limin. "PHASE SYNCHRONIZATION IN THREE-DIMENSIONAL LATTICES AND GLOBALLY COUPLED POPULATIONS OF NONIDENTICAL ROSSLER OSCILLATORS." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4180.

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A study on phase synchronization in large populations of nonlinear dynamical systems is presented in this thesis. Using the well-known Rossler system as a prototypical model, phase synchronization in one oscillator with periodic external forcing and in two-coupled nonidentical oscillators was explored at first. The study was further extended to consider three-dimensional lattices and globally coupled populations of nonidentical oscillators, in which the mathematical formulation that represents phase synchronization in the generalized N-coupled Rossler system was derived and several computer pr

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18

Usman, Muhammad. "Forced Oscillations of the Korteweg-de Vries Equation and Their Stability." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186552805.

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19

Kale, Ozkan. "An Empirical Relationship Based On High-pass Filtering To Estimate Usable Period Range For Nonlinear Sdof Response." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611432/index.pdf.

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High-pass filtering that is one of the most efficient methods in removing long-period noise of accelerograms is investigated for its effect on nonlinear oscillator deformation response. Within this context, uncertainty in filter cut-off periods that would significantly modify the low-frequency content of accelerograms come into prominence for obtaining reliable long-period displacement response. Analog and digital ground-motion records from recently compiled Turkish strong-motion database are used and these records are high-pass filtered with a consistent methodology by randomly generated filt

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20

Boudjema, Souhila. "OSCILLATIONS DANS DES ÉQUATIONS DE LIÉNARD ET DES ÉQUATIONS D'ÉVOLUTION SEMI-LINÉAIRES." Phd thesis, Université Panthéon-Sorbonne - Paris I, 2013. http://tel.archives-ouvertes.fr/tel-00903302.

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Dans ce travail, on étudier, au voisinage d'un point d'équilibre, l'existence et l'unicité et la dépendance régulière des solutions presque-périodique (p.p.), présqu'automorphe (p.a.), asymptotiquement p.p., asymptotiquement p.a., pseudo p.p., pseudo p.a., pseudo p.p. avec poids, pseudo p.a. avec poids de la famille d'équations de Liénard forcée suivantes x''(t) + f(x(t), p). x'(t) + g(x(t), p) = ep(t), (1) où le terme ep est de la même nature que la solution, et p est un paramètre dans un espace de Banach. On utilise le théorème des fonctions implicites au voisinage de l'équilibre. On étudier

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21

Kulebi, Baybars. "The Broad-band Noise Characteristics Of Selected Cataclysmic Variables (cvs), Anomalous X-ray Pulsars (axps) And Soft Gamma Repeaters (sgrs)." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608117/index.pdf.

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In this work present the broad-band noise structure in the 2-60 keV data of Cataclysmic Variables (CVs) with Anomalous X-Ray Pulsars (AXPs) and Soft Gamma Repeaters (SGRs). We analyzed Rossi X-ray Timing Explorer (RXTE) PCA data and derived time series from 27 CVs, 4 AXPs and 1 SGR using the RXTE archive. In general, CVs of different types all show broad band noise which can be fitted with power laws, using exponentional cut-offs, and Lorentzians in a similar way to power spectral (noise) characteristics of X-ray Binaries (XRBs). In general terms the power spectra show a power law index of (-)

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22

Andersson, Jonathan. "Asymptotic behavior and effective boundaries forage-structured population models in aperiodically changing environment." Thesis, Linköpings universitet, Matematik och tillämpad matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-133632.

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Human activity and other events can cause environmental changes to the habitat of organisms. The environmental changes effect the vital rates for a population. In order to predict the impact of these environmental changes on populations, we use two different models for population dynamics. One simpler linear model that ignores environmental competition between individuals and another model that does not. Our population models take into consideration the age distribution of the population and thus takes into consideration the impact of demographics. This thesis generalize two theorems, one for

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23

Wang, Yunli. "Etude expérimentale et numérique des oscillations hydrodynamiques en milieux poreux partiellement saturés." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0127/document.

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Cette thèse vise à étudier expérimentalement, analytiquement et numériquement, les conséquences de variations et d'oscillations hydrodynamiques à forte variabilité temporelle en milieux poreux partiellement saturés. Les problèmes que nous étudions comportent des surfaces libres tant à l'extérieur qu'à l'intérieur des milieux poreux, celles-ci étant définies comme des isosurfaces de pression d'eau égale à la pression atmosphérique (Pwater = Patm). Les différentes études expérimentales réalisées en laboratoire sont, respectivement : une expérience d'imbibition dans une boite à sable avec effets

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Viveros, Rogel Jorge. "An extension of KAM theory to quasi-periodic breather solutions in Hamiltonian lattice systems." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19869.

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We prove the existence and linear stability of quasi-periodic breather solutions in a 1d Hamiltonian lattice of identical, weakly-coupled, anharmonic oscillators with general on-site potentials and under the effect of long-ranged interaction, via de KAM technique. We prove the persistence of finite-dimensional tori which correspond in the uncoupled limit to N arbitrary lattice sites initially excited. The frequencies of the invariant tori of the perturbed system are only slightly deformed from the frequencies of the unperturbed tori.

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25

Hughes, Robert James. "Magneto-oscillatory exchange coupling in magnetic multilayers with Crâ†1â†-â†xVâ†x and Crâ†1â†-â†xMoâ†x spacers : the correlation of extremal fermi surface vectors with oscillation periods." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326267.

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26

Sabri, Abderrahmane. "Regimes oscillatoires et couplage vibro-rotatif d'un systeme dynamique a periodicite spatio-temporelle." Toulouse 3, 1986. http://www.theses.fr/1986TOU30199.

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L'objet de cette etude est la determination qualitative et quantitative des regimes oscillatoires et vibro-rotatifs d'un systeme dynamique conservatif ou faiblement amorti, modelises par l'equation du pendule excite periodiquement. L'analyse qualitative est basee essentiellement sur l'etablissement de la distribution des singularites dans le plan de phase de la recurrence associee, pour les regimes oscillatoires, et sur un cylindre de phase particulier pour les regimes vibro-rotatifs. La connaissance des proprietes quantitatives a permis de construire les expressions analytiques approchees de

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27

Beklen, Elif. "Timing Observations From Rossi X-ray Timing Explorer (rxte)." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1260199/index.pdf.

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In this thesis, RXTE observations of 4U 1907+09 are presented. Timing analysis of these data sets have yielded quasi periodic oscillations (QPOs) at orbital phases corresponding to the two flares in every orbital period. Known continuous spin down trend and QPO behaviour at the flares strongly suggest that a transient accretion disk occurs at the flares. Our findings strongly suggested that neutron star passes through the equatorial wind of Be companion star. During these passages a transient disk forms around Be neutron star.

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Mai, Cuong. "Frequency Estimation Using Time-Frequency Based Methods." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/571.

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Any periodic signal can be decomposed into a sum of oscillating functions. Traditionally, cosine and sine segments have been used to represent a single period of the periodic signal (Fourier Series). In more general cases, each of these functions can be represented by a set of spectral parameters such as its amplitude, frequency, phase, and the variability of its instantaneous spectral components. The accuracy of these parameters depends on several processing variables such as resolution, noise level, and bias of the algorithm used. This thesis presents some background of existing freque

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Pancieri, José Guilherme Pelição. "Análise de movimentos periódicos em sistemas bi-linear com folga simétrica." Universidade Federal do Espírito Santo, 2012. http://repositorio.ufes.br/handle/10/6256.

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Made available in DSpace on 2016-12-23T14:08:15Z (GMT). No. of bitstreams: 1 Jose Guilherme Pelicao Pancieri.pdf: 849076 bytes, checksum: 4cc56d57d53f4b6c3d0fd9c325a5bd22 (MD5) Previous issue date: 2012-03-27<br>O presente trabalho apresenta a modelagem matemática de um sistema vibracional com excitação harmônica da base. Esse tipo de sistema tem sido estudado por vários pesquisadores que exploraram muitos aspectos da dinâmica global. No entanto, na grande parte dos sistemas estudados, o sistema era modelado para uma característica de vibroimpacto. No sistema aqui estudado, os impactos são s

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Xin, Ying. "Complex Dynamical Systems: Definitions of Entropy, Proliferation of Epithelia and Spread of Infections and Information." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1522955730251256.

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Urmès, Caroline. "Expérimentation et modélisation dynamiques de réacteurs catalytiques : vers une meilleure description du processus catalytique." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1226/document.

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L'étude cinétique d'une réaction catalytique permet une meilleure compréhension du mécanisme réactionnel et du fonctionnement du catalyseur. Elle est nécessaire pour le dimensionnement des réacteurs et des procédés. Les modèles micro-cinétiques sont constitués d'une séquence d'étapes élémentaires sans hypothèses sur les étapes cinétiquement déterminantes. Ces modèles sont applicables sur des plages de conditions opératoires plus larges que celles des modèles plus classiques de type Langmuir-Hinshelwood (LH) ou d'Hougen-Watson. Lorsqu'ils sont implémentés dans un modèle de réacteur, ils permett

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Inam, Sitki Cagdas. "X-ray Observations Of Accretion Powered Pulsars." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605552/index.pdf.

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In this thesis, X-ray observations of four accretion powered pulsars are presented. Using RXTE observations of 4U 1907+09, we found three new pulse periods of the source. We found that the source spun-down almost at a constant rate of $dot nu$ = (-3.54 $pm 0.02) times 10^{-14}$ Hz s$^{-1}$ for more than 15 years. Using RXTE observations, X-ray flux related spectral and timing features in 2S 1417-62 were, in general, interpreted as a sign of a disc accretion with a similar geometry with a varying mass accretion rate, whereas spectral and timing features of the low X-ray flux regions were

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Marsh, Richard. "Superconducting phase coherent electron transport in nano-engineered ferromagnetic vortices." Thesis, Royal Holloway, University of London, 2013. http://repository.royalholloway.ac.uk/items/66b15a59-0b9f-4e68-b0aa-47e93f77349a/6/.

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This thesis presents an experimental study of the superconducting proximity effect in sub-micrometer sized ferromagnetic discs. Such discs belong to a class of mesoscopic ferromagnets intermediate between microscopic magnets with dimensions below about 10nm that behave as single giant spins and macroscopic structures that are larger than approximately 1 micrometer where domains are formed to minimise stray fields. The magnetic structure of mesoscopic magnets is strongly dependent on their geometric shape, allowing for purposeful engineering of magnetic structures using modern lithographic tech

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Bulbul, Gul Esra. "Rxte And Chandra Observations Of Galctic Microquasars Grs 1915+105 And Gro J1655-40." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607392/index.pdf.

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In this thesis, RXTE timing analysis of Galactic Microquasars GRO J1655-40 and GRS 1915+105, the Chandra and RXTE joint spectral analysis of GRS 1915+105 are presented. We have investigated quasi periodic oscillations (QPOs) in the black hole binaries GRO J1655-40 and GRS 1915+105 observed in 99 and 122 observations made by the Proportional Counter Array (PCA) on board Rossi X-Ray Timing Explorer (RXTE) in both low energy band (2-12 keV) and high energy band (13-27 keV), respectively. Four different X-ray states are seen in the combined characteristics of power spectra, light curves extracted

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Dolcemascolo, Axel. "Laser à semi-conducteur pour modéliser et contrôler des cellules et des réseaux excitables." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4208/document.

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Les systèmes « excitables » sont omniprésents dans la nature, le plus paradigmatique d'entre eux étant le neurone, qui répond de façon « tout ou rien » aux perturbations externes. Cette particularité étant clairement établie comme l'un des points clé pour le fonctionnement des systèmes nerveux, son analyse dans des systèmes modèles (mathématiques ou physiques) peut d'une part aider à la compréhension de la dynamique d'ensembles de neurones couplés et d'autre part ouvrir des voies pour un traitement neuromimétique de l'information. C'est dans cette logique que s'inscrit la préparation de cette

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Tadrous, Ebram. "Experimental investigation of the transition of Marangoni convection around a stationary gas bubble towards turbulent flow." Universitätsverlag Chemnitz, 2020. https://monarch.qucosa.de/id/qucosa%3A74993.

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In this study, thermocapillary-driven convection around a gas bubble under a horizontal heated wall is experimentally investigated under gravitational conditions. The thermocapillary convective flow under conditions beyond the laminar steady state towards turbulent flow is explored in detail. Generally, Marangoni convection is more critical and important under microgravity conditions rather than on earth. Under low gravity, this surface tension induced flow can dictate both heat and mass transfer processes. Thus, thermocapillary convection should be considered by manufacturers during material

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Sfecci, Andrea. "Some existence results for boundary value problems : a promenade along resonance." Doctoral thesis, SISSA, 2012. http://hdl.handle.net/20.500.11767/4703.

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I present many existence result to many boundary value problems, in particular periodic problems and Neumann elliptic problems. The results use the method of the topological degree theory. In the thesis different problems are treated: planar systems, systems with a singularity, impact oscillators, coupled oscillators and radial elliptic problems.

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Zouari, Sahar. "Bandes interdites d’ondes de flexion dans une méta-plaque composite : effet de finitude de la structure et des dispersions de fabrication." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1034/document.

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Ce travail de thèse porte sur l'étude de l'intégration des fonctions d'amortissement vibroacoustique dans des plaques en matériau composite. Dans un premier temps, pour une méta-plaque non composite, les caractéristiques d'atténuation des vibrations ont été étudiées avec un réseau périodique de résonateurs (poutre-masse) attachés à une plaque.L'effet de périodicité et des résonances locales permet de bloquer la propagation d'ondes sur des plages de fréquences données, appelée bandes interdites. Des simulations numériques basées sur la MEF ont permis de calculer les diagrammes de bandes des pla

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Lange, Carsten. "Advanced nonlinear stability analysis of boiling water nuclear reactors." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-24954.

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This thesis is concerned with nonlinear analyses of BWR stability behaviour, contributing to a deeper understanding in this field. Despite negative feedback-coefficients of a BWR, there are operational points (OP) at which oscillatory instabilities occur. So far, a comprehensive and an in-depth understanding of the nonlinear BWR stability behaviour are missing, even though the impact of the significant physical parameters is well known. In particular, this concerns parameter regions in which linear stability indicators, like the asymptotic decay ratio, lose their meaning. Nonlinear stability a

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Sbai, Youssef. "Analyse semi-classique des opérateurs périodiques perturbés." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0270/document.

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Cette thèse traite de certaines propriétés spectrales de deux classes spécifiques des opérateurs périodiques. Nous nous intéressons tout d’abord à un modèle périodique perturbée par un opérateur dépendant d’un petit paramètre semi-classique. Nous obtenons alors le comportement asymptotique de la fonction du comptage des valeurs propres dans les gaps spectrales avec une estimation optimale du reste. Le second modèle étudié dans cette thèse est un modèle elliptique périodique d’ordre deux perturbée par un opérateur dépendant d’une grande constante de couplage. Nous donnons également la descripti

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Karkar, Sami. "Méthodes numériques pour les systèmes dynamiques non linéaires : application aux instruments de musique auto-oscillants." Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00742651.

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Ces travaux s'articulent autour du calcul des solutions périodiques dans les systèmes dynamiques non linéaires, au moyen de méthodes numériques de continuation. La recherche de solutions périodiques se traduit par un problème avec conditions aux limites périodiques, pour lequel nous avons implémenté deux méthodes d'approximation : - Une méthode spectrale dans le domaine fréquentiel : l'équilibrage harmonique d'ordre élevé, qui repose sur une formulation quadratique des équations. Nous proposons en outre une formulation originale permettant d'étendre cette méthode aux cas de non-linéarités non

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Hsieh, Shie-chin, and 謝協縉. "Frequency Conversion using Period-One Oscillation of Optically Injected Semiconductor Lasers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/76706532887504938924.

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碩士<br>國立中正大學<br>光機電整合工程所<br>96<br>A numerical study on all-optical frequency conversion on nonlinear dynamical period-one oscillations of optically injected semiconductor lasers is presented in this thesis. wavelength conversion is demonstrated at 2.5 GHz over a wavelength span of 50GHz by the use of period-one oscillation in optical injection configuration. An increase in the signal to noise ratio is measured for the converted signal compared to the input signal implying signal regeneration as well as wavelength conversion.

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Ping, Hsueh, and 薛秉中. "Modulation Characteristics of Microwave Photonics Using Period-One Oscillation of Optically Injected Semiconductor Lasers." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/91745362632019164785.

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碩士<br>國立中正大學<br>光機電整合工程所<br>97<br>A numerical study of semiconductor lasers external optical injection lock system, master laser modulated response based on period one oscillation condition is presented in this thesis. An evluation for novel application in ROF system also presented in this work. Modulation parameters such as modulation index (MI), frequency modulation index ( ), frequency deviation ( ) are investigated to help us understand the amplitude/frequency modulated response of this system. Also the frequency response of modulation frequency for this optical communication generation, 2

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Lin, Che-yang, and 林哲揚. "Modulation Characteristics in Frequency Conversion based on Period-One Oscillation of Optically Injected Semiconductor Lasers." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/77431671929434698051.

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碩士<br>國立中正大學<br>光機電整合工程所<br>97<br>The thesis is individually done by way of numerical simulation analysis to research nonlinear dynamical periodic-one oscillation of optical injected semiconductor lasers. By means of injection continuous optical signal, it discusses the relation between the differently operative point and conversion efficiency or transmission efficiency. Also, the thesis discusses how the laser noise affect nonlinear dynamical periodic-one oscillation of optical injected semiconductor lasers. And changing the operative point to better conversion efficiency or transmission effi

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Tzavaris, Petros. ""Absence of a refractory period for mechanical activation of p54-JNK in rat plantaris in situ"." Thèse, 2006. http://hdl.handle.net/1866/15460.

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Wong, Geraldine H. "Drought predictions: applications in Australia." Thesis, 2010. http://hdl.handle.net/2440/64290.

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Drought is a global and recurrent natural phenomenon, the inevitable consequence of meteorological variability. This natural hazard brings about devastating effects because water is one of the most fundamental commodities for human survival, and a lack of water can result in varying consequences, from mere inconvenience to life threatening instances. Drought cannot be prevented but its effects can be mitigated through the design of appropriate water resource infrastructure and management strategies. The goal of this thesis is to model the spatial and temporal characteristics of drought occurre

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Penn, Matthew James. "The source of five-minute period photospheric umbral oscillations." Thesis, 1992. http://hdl.handle.net/10125/9345.

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Chen, Kuan-Wei, and 陳冠維. "Periods and Amplitudes of Oscillations in Coupled Systems." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/85462070598103360844.

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碩士<br>國立交通大學<br>應用數學系數學建模與科學計算碩士班<br>101<br>In this thesis, we study the periods and amplitudes in coupled oscillations. The study is motivated by some interesting investigations in mathematical models on biological clocks. Herein, we couple two oscillators, and use the Hopf bifurcation theorem to show that the coupled oscillation is sustained. We observe the relation between the collective period and the isolated individual periods. We also study the amplitudes of oscillations in coupled systems. In particular, we discuss the oscillations in three-cell feed-forward by Golubitsky and collabora

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Liang, Dian-Hao, and 梁典浩. "Effects of Laser Parameters on Period-One Oscillations of Optically Injected Semiconductor Lasers." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/60458597131978706763.

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碩士<br>國立中正大學<br>光機電整合工程所<br>94<br>ABSTRACT A numerical study on effects of laser parameters on period-one oscillations of optically injected semiconductor lasers is presented in this thesis. In this study, nonlinear dynamics、frequency separation、intensity difference、conversion efficiency、transmission efficiency as a function of laser parameters are investigated and discussed to assess suitability for frequency converter due to period-one oscillations spectrum characteristic is similar to frequency conversion. Nonlinear dynamics of an optically injected semiconductor laser is mapped as a func

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張馨勻. "Ranging and Velocity Detection using Period-One Oscillations in an Optically Injected Semiconductor Laser." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/82370223873555848607.

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碩士<br>國立清華大學<br>光電工程研究所<br>96<br>We numerically simulated signal generation for range and velocity detecction utilizing optically injected (OI) system. OI system consists of a master laser and a slave laser. By tuning the operating parameters, the optically injected semiconductor laser can be operated in different instable regions. There are stable-locking, chaotic oscillation (CO), period-one oscillation (P1), period-two oscillation (P2) and high order oscillation regions. We research the radar for range and velocity detection with P1 state. For range detection, two schemes will be used to ge

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