Relevant bibliographies by topics / Limits of Stability / Dissertations / Theses
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Dissertations / Theses on the topic 'Limits of Stability'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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1

Reinert, Senia Smoot. "Enhancing Posturography Stabilization Analysis and Limits of Stability Assessment." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1470227622.

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2

Rudholmer, Elin. "Inlärningseffekten på Limits of Stability på Transtibialt Amputerade Protesbrukare." Thesis, Hälsohögskolan, Högskolan i Jönköping, HHJ, Avd. för rehabilitering, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-30427.

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Syftet med studien är att undersöka om det finns någon inlärningseffekt på testet Limits of Stability (LoS) för transtibialt amputerade protesbrukare och en kontrollgrupp. Sju transtibialt amputerade protesbrukare och en kontrollgrupp bestående av sju friska vuxna män upprepade testet LoS  fem gånger under fyra testtillfällen. Två kraftplattor och 69 reflexmarkörer användes för att samla in data. Testpersonerna placerades med en fot på varje kraftplatta och blev instruerade att förflytta sin center of pressure genom att luta kroppen från anklarna mot åtta mål som visades på en skärm tillsamman
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3

Dunton, Elizabeth Marie. "Kinematic and stability motion limits for a hexapod walking machine." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA295654.

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Thesis (M.S. in Computer Science) Naval Postgraduate School, March 1995.<br>"March 1995." Thesis advisor(s): Robert B. McGhee, Michael J. Zyda. Includes bibliographical references. Also available online.
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4

Huo, Feng. "Limits of stability and postural sway in young and older people." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0005/MQ42635.pdf.

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5

Sauba, Rooktabir Nandan. "Stability limits and combustion measurements in low calorific value gas flames." Thesis, Middlesex University, 1987. http://eprints.mdx.ac.uk/13380/.

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A Hilton combustor was substantially modified to a suitable symmetrical configuration for research purposes. Provisions for swirl, preheat and injection of LCV gases were incorporated with appropriate burner management systems for safe operation. Instrumentation for temperature, velocity and concentration measurements was developed and fully automated by interfacing to a microprocessor for rapid data acquisition. Flame stability limits were determined over a wide range of operating conditions by varying swirl, secondary air temperature and excess air levels while maintaining the burner momentu
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6

Tamimi, Ala. "Voltage stability limits for weak power systems with high wind penetration." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/13100.

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Doctor of Philosophy<br>Department of Electrical and Computer Engineering<br>Anil Pahwa<br>Shelli K. Starrett<br>Analysis of power system voltage stability has practical value in increasing wind penetration levels. As wind penetration levels increase in power systems, voltage stability challenges arise due to locating wind resources far away from load centers. This dissertation presents several different voltage stability methods for sizing new wind farms. Power system wind penetration levels depend on the available voltage stability margins (VSMs) of the existing power system and system load
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7

Hill, Martin John. "The limits and control of mixture leanness for stable engine operation." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367163.

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8

Rodríguez, Tinoco Cristian. "Calorimetric study of vapour deposited glasses: beyond conventional stability and temperature limits." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/386488.

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La deposición de capas a partir de la fase vapor se ha convertido recientemente en una herramienta muy potente de cara a la fabricación de vidrios de una estabilidad sin precedentes. Los vidrios depositados a partir de la fase vapor pueden tener propiedades seleccionadas a medida, simplemente ajustando las condiciones de deposición. En particular, los vidrios de máxima estabilidad se obtienen cuando la temperatura del substrato se encuentra alrededor de 0.85Tg. Por otra parte, la nanocalorimetría a altas velocidades de escaneo ha demostrado ser una herramienta muy útil para la caracterización
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9

Nechipurenko, Inna. "FoxO limits microtubule stability and is itself negatively regulated by microtubule disruption." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1333500439.

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10

Hauptmann, Marek, Sebastian Kaulfürst, and Jens-Peter Majschak. "Advances on Geometrical Limits in the Deep Drawing Process of Paperboard." NC State University, 2016. https://tud.qucosa.de/id/qucosa%3A30229.

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The geometrical limits of the deep drawing process of paper to advanced shapes are not known. This report examines the technological limits of convex elements of the base shape in relation to the drawing height and shows the material behavior in the bottom radius of 3D shapes with regard to special material properties. In the bottom radius, non-compressed wrinkles occurred due to the in-plane compression, but wrinkles were reduced by an increased blank holder force or tool temperatures and improved extensibility or in-plane compressive strain. The forming ratio during deep
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11

Kasuya, Yuko. "The presidential connection : party system instability and executive term limits in the Philippines /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3159873.

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12

Quinonez-Varela, Gustavo. "Modelling determination of the stability and penetration limits of wind turbines in autonomous power systems." Thesis, University of Strathclyde, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.436841.

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13

Karbassi, Massoumeh. "Analytical and experimental studies of the stability limits of nonpremixed flames in a co-flowing stream." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24541.pdf.

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14

Papanikolaou, Nancy. "An experimental investigation of the flow structure and stability limits of jet diffusion flames in a co-flowing oxidizing stream." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/NQ31062.pdf.

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15

Yakouchyk, Katsiaryna [Verfasser], and Daniel [Akademischer Betreuer] Göler. "Post-Soviet Region, Authoritarian Stability, and Autocracy Promotion: Limits to the European Union’s External Governance / Katsiaryna Yakouchyk ; Betreuer: Daniel Göler." Passau : Universität Passau, 2019. http://d-nb.info/1180025814/34.

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16

Yakouchyk, Katsiaryna Verfasser], and Daniel [Akademischer Betreuer] [Göler. "Post-Soviet Region, Authoritarian Stability, and Autocracy Promotion: Limits to the European Union’s External Governance / Katsiaryna Yakouchyk ; Betreuer: Daniel Göler." Passau : Universität Passau, 2019. http://nbn-resolving.de/urn:nbn:de:bvb:739-opus4-6146.

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17

Venter, Marike. "Computerized dynamic posturography in ballet dancers." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/59162.

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Balance is the ability to maintain an individual’s centre of mass over his or her base of support while standing. Ballet dancers have better balance than non-dancer control groups as they presented with better sensory-motor integrative skills when required to maintain a given posture for a longer period. To evaluate functional balance abilities, assessing individuals with above average balance abilities may provide valuable information about function. The balance of trained ballet dancers (N1) was investigated by comparing Sensory Organisaiton Test (SOT), Motor Control Test (MCT) and Limits of
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18

Assefa, Hana Yohannes. "Stability Investigation of an Advanced Electrical Rail Vehicle : Investigation of the Effect of Nonlinearity Introduced by a Switching Model of an Advanced Electrical Rail Vehicle on the General Performance and The Stability Limits." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9094.

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<p>Reducing grid harmonics and increasing grid stability are both major issues for the operation of rail vehicles. For stability investigation of complex power systems, simplified system models are in need in order to reduce the model complexity and the simulation time. In this thesis work the effect of modelling a voltage source converter (VSC) for traction power system with and without the detailed pulse width modulated (PWM)-switch model is modeled. Effect of different operating conditions for the switching model on the harmonic content of the system is also analyzed. The same disturbanc
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19

Chan, Teck-Wai. "Proximity-to-Separation Based Energy Function Control Strategy for Power System Stability." Queensland University of Technology, 2003. http://eprints.qut.edu.au/15840/.

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The issue of angle instability has been widely discussed in the power engineering literature. Many control techniques have been proposed to provide the complementary synchronizing and damping torques through generators and/or network connected power apparatus such as FACTs, braking resistors and DC links. The synchronizing torque component keeps all generators in synchronism while damping torque reduces oscillations and returns the power system to its pre-fault operating condition. One of the main factors limiting the transfer capacity of the electrical transmission network is the separation o
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20

Abrantes, Adriano Lima. "Bifurcações induzidas por limites no contexto de estabilidade de tensão." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-31082016-113911/.

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A interligação dos sistemas elétricos de potência (SEPs) resultou em um aumento na complexidade dos mesmos. Além disso, devido a pressões econômicas e ambientais, os sistemas têm operado mais próximos aos seus limites de transmissão, o que aumenta a relevância de análises de segurança no contexto de estabilidade de tensão. Neste cenário, problemas associados à capacidade de transmissão do SEP, como a bifurcação induzida por limite (BIL), tornam-se mais importantes, criando a necessidade de ferramentas de análise apropriadas. Um dos objetivos deste projeto de mestrado é estudar mais profundamen
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21

Pan, Qiujing. "Deterministic and Probabilistic Assessment of Tunnel Face Stability." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI044.

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The main work for Qiujing PAN’s PhD thesis is to develop the stability analysis for underground structures, which contains two parts, deterministic model and probabilistic analysis. During his 1st year of PhD research, he has mainly finished the deterministic model study. In the 2nd year, I developed a probabilistic model for high dimensional problems<br>In the contemporary society, the utilization and exploitation of underground space has become an inevitable and necessary measure to solve the current urban congestion. One of the most important requirements for successful design and construct
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22

Velleret, Aurélien. "Mesures quasi-stationnaires et applications à la modélisation de l'évolution biologique." Thesis, Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0226.

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Je décris le comportement en temps long de plusieurs processus qui illustrent les mécanismes de sélection naturelle. Il arrive que ces effets de sélection s’interprètent comme un conditionnement qui biaise la dynamique d’un processus aléatoire "neutre". Ce processus évolue sur un espace potentiellement très général, notamment continu et non borné. On peut ainsi caractériser aussi bien la dynamique du profil complet de la population que celle du profil d’un individu choisi uniformément dans la population. On voit naturellement apparaître dans ces modèles des transitions brutales de ces lois qui
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23

EL-Kahky, Ayman Mohamed. "Video posturography near the limit of stability." [Maastricht : Maastricht : Universiteit Maastricht] ; University Library, Maastricht University [Host], 1998. http://arno.unimaas.nl/show.cgi?fid=8542.

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24

Liu, Ying, and 劉影. "Limit equilibrium methods for slope stability analysis." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B42576684.

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25

Liu, Ying. "Limit equilibrium methods for slope stability analysis." Click to view the E-thesis via HKUTO, 2002. http://sunzi.lib.hku.hk/hkuto/record/B42576684.

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26

Bonne, Nicolas. "Stabilité de l'intéraction onde de choc/ couche limite laminaire." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX025/document.

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Le phénomène d’interaction onde de choc/couche limite (CL) est omniprésent en aérodynamique. De manière générale, il génère des oscillations basses fréquences qui peuvent être néfastes pour les machines. L’exemple typique est le tremblement de l’onde de choc sur profil d’aile en régime transsonique, dangereux car il peut exciter les modes de structure de l’aile et potentiellement la rompre. Ce type de phénoménologies a été largement étudié en condition de CL amont turbulente, ce qui a donné lieu à des scénarios physiques crédibles et des méthodologies d’étude efficaces, notamment les analyses
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27

Butler, Bradley D. "AXIAL COMPRESSOR FLOW BEHAVIOR NEAR THE AERODYNAMIC STABILITY LIMIT." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/34.

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In this investigation, casing mounted high frequency response pressure transducers are used to characterize the flow behavior near the aerodynamic stability limit of a low speed single stage axial flow compressor. Time variant pressure measurements are acquired at discrete operating points up to the stall inception point and during the transition to rotating stall, for a length of time no shorter than 900 rotor revolutions. The experimental data is analyzed using multiple techniques in the time and frequency domains. Experimental results have shown an increase in the breakdown of flow periodic
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28

GILLIBERT, ALAIN. "Mesures de masse aux limites de la stabilite." Paris 7, 1987. http://www.theses.fr/1987PA077290.

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29

Berrouane, Salah. "Les lois limites des k-iemes valeurs de record et leurs concomitants." Paris 6, 1986. http://www.theses.fr/1986PA066388.

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Nous généraliserons tous les résultats des lois limites des k-iemes valeurs de record (k >ou= 1). Nous énoncerons deux résultats concernant la structure poissonienne des k-iemes valeurs de record. Nous étudierons en détail la stabilité en probabilité ; et nous énoncerons un résultat concernant les records issus d'une fonction de répartition normale. Nous utiliserons le processus de winner w(t) pour l'approximation forte des k-iemes valeurs de record. Une application du théorème de Komlos, Major et Tusnady donne un résultat concernant la stabilité forte. En second lieu, nous définissons les con
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30

Dhingra, Manuj. "Compressor stability management." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-01102006-174943/.

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Thesis (Ph. D.)--Aerospace Engineering, Georgia Institute of Technology, 2006.<br>Prasad, J.V.R., Committee Chair ; Neumeier, Yedidia, Committee Member ; Seitzman, Jerry, Committee Member ; Sankar, Lakshmi, Committee Member ; Wadia, Aspi, Committee Member.
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31

Aryal, Krishna Prasad. "Slope Stability Evaluations by Limit Equilibrium and Finite Element Methods." Doctoral thesis, Norwegian University of Science and Technology, Department of Civil and Transport Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1868.

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<p>This thesis deals with slope stability evolutions carried out by commonly used limit equilibrium (LE) and finite element (FE) methods. The study utilizes two LE based software (SLOPE/W and SLIDE) and one FE based software (PLAXIS). The principal difference between these two analyses approaches is that the LE methods are based on the static of equilibrium whereas FE methods utilise the stress‐strain relationship or constitutive law. </p><p>To fulfil one of the aims of the study, the LE based methods are compared based on the factor of safety (FOS) obtained for various load combinations. The
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32

Potgieter, Jean-Timothy. "Finite element versus limit equilibrium stability analyses for surface excavations." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/63001.

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Limit equilibrium methods are widely and routinely used in practice. In several codes, limit equilibrium methods are recommended to evaluate the stability of a lateral support systems, such as soil-nails and anchors, to an acceptable defined factor of safety. For decades, limit equilibrium methods have been used successfully in providing an acceptable margin of safety against failure (movements, which can be significantly more complex, is not considered). However, due to the advances in computational power offered by personal computers, finite element modelling has become increasingly ac
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33

DELCOIGNE, FRANCK. "Stabilite et limite thermodynamique dans certains reseaux a polling." Paris 6, 1999. http://www.theses.fr/1999PA066143.

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On aborde dans cette these les problemes du calcul des conditions necessaires et suffisantes d'ergodicite et du comportement en limite thermodynamique de certains systemes a polling decrivant l'evolution de reseaux de transport. Le modele propose dans le premier chapitre se presente comme une variante a routage markovien, ou les serveurs arrivant a une file vide attendent la prochaine arrivee de client a cette file (e. G. Probleme du taxi). Sous des hypotheses assez larges de stationnarite pour les processus d'arrivee et de service, on montre que le reseau ne peut etre que transient ou recurre
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34

Sartor, Fulvio. "Unsteadiness in transonic shock-wave/boundary layer interactions : experimental investigation and global stability analysis." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4705.

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Dans cette étude nous considérons l'interaction entre une onde de choc et une couche limite turbulente sur un écoulement transsonique sur une bosse d'un point de vue expérimentale et théorique.Des mesures expérimentales ont permis de montrer que l'interaction est caractérisée par la coexistence de deux fréquences caractéristiques distinctes, mais l'origine des oscillations est controversée. Des simulations numériques permettent une description de l'écoulement moyen, mais ne sont pas capables de reproduire le comportement instable de l'interaction. Nous proposons d'abord une étude de stabilité
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35

Poruba, Michal. "Návrh sanace sesuvu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227466.

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Main goal of thesis entitled "Landslide remediation design" is - based on acquired knowledge and submitted documents about the problematic of landslides - to determine the causes of the landslides on II. class road between villages Koryčany and Jestřabice and to propose optimal redevelopment.
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Desrayaud, Gilles. "Analyse de stabilite lineaire dans un milieu semitransparent : determination experimentale des limites de stabilite dans un milieu transparent." Paris 6, 1987. http://www.theses.fr/1987PA066089.

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Etude de la stabilite des regimes d'ecoulement de convection naturelle dans un fluide semi-transparent confine entre deux parois verticales chauffees differentiellement. Resolution des equations de l'ecoulement et du probleme aux valeurs propres par une methode spectrale tau utilisant les polynomes de chebyshev. Etude experimentale des limites de stabilite dans des cavites verticales remplies d'air par interferometrie holographique et injection de fumee
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37

Warren, Sean N. "Limit equilibrium stability analysis utilizing geotechnical data at Mount Baker, Washington /." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1461537.

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Thesis (M.S.)--University of Nevada, Reno, 2008.<br>"December 2008." Includes bibliographical references (leaves 109-112). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web. Library also has electronic version on CD-ROM
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ARAUJO, LUIZ GONZAGA DE. "NUMERICAL STUDIES OF THE STABILITY OF GEOTECHNICAL MATERIALS THROUGH LIMIT ANALYSIS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=2084@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>O presente trabalho apresenta um estudo de problemas de estabilidade, freqüentemente,encontrados, em Engenharia Geotécnica, através da técnica da Análise Limite associada ao Método dos Elementos Finitos (MEF).Inicialmente, faz-se uma revisão das formulações da Análise Limite, via MEF,encontradas, com maior freqüência, na literatura técnica especializada.Uma formulação mista que é descrita em detalhe na tese foi escolhida para implementação. Extensões das formulações da Análise Limite de meios contínuos são propostas para
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Ukritchon, Boonchai 1970. "Application of numerical limit analyses for undrained stability problems in clay." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9591.

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Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.<br>Includes bibliographical references.<br>This thesis describes the development and application of numerical limit analyses for planar, undrained stability problems in geotechnical engineering. The proposed analyses formulate upper and lower bound theorems for perfectly plastic, cohesive­frictional soils as linear programming problems, with spatial variations of the unknown velocities and stresses approximated by standard finite element interpolation functions. The thesis includes three
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40

Dantzer, Jean-François. "Stabilité des réseaux de files d'attente et limites fluides stochastiques." Versailles-St Quentin en Yvelines, 2000. http://www.theses.fr/2000VERS0010.

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Le domaine étudié est celui de la stabilité du trafic et du stockage de messages dans les réseaux informatiques. On rappelle les principaux résultats sur les fonctions de Liapunov. La suite du premier chapitre est consacrée aux limites fluides, méthode développée depuis les années 90. Elles ont l'avantage de décrire un modèle sous une forme macroscopique et permettent ainsi d'écrire de façon simplifiée les équations régies par la dynamique établie sur le réseau. Une condition de stabilité est établie à partir du modèle fluide. On étudie deux modèles de réseaux dont les serveurs tombent en pann
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Guiho, Florian. "Analyse de stabilité linéaire globale d'écoulements compressibles : application aux interactions onde de choc / couche limite." Thesis, Paris, ENSAM, 2015. http://www.theses.fr/2015ENAM0003/document.

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Cette thèse a pour objectif d'améliorer la compréhension de la dynamique d'une interaction entre une onde de choc droite ou oblique et une couche limite laminaire ou turbulente. En particulier, nous nous sommes intéressés aux mécanismes responsables de l'apparition d'oscillations auto-entretenues basses fréquences. Ce phénomène survient dans de nombreux cas applicatifs comme dans des entrées d'air d'avions supersoniques, autour d'un profil d'aile en régime transsonique et au sein de tuyère en régime de sur-détente. La première partie de ce mémoire traite des différentes études réalisées pour d
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Bugeat, Benjamin. "Stabilité et perturbations optimales globales d'écoulements compressibles pariétaux." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066504/document.

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Une méthode de calcul de forçage optimal a été employée afin d'analyser le caractère amplificateur sélectif de bruit d'écoulements compressibles pariétaux. Une telle approche inclut la prise en compte de croissances non-modales induites par la non-normalité des équations de Navier-Stokes linéarisées. La méthode numérique repose sur le calcul de la matrice résolvante globale et la résolution d'un problème aux valeurs propres associé à un problème d'optimisation. Les densités d'énergie des forçages et réponses optimaux calculés pour une couche limite supersonique ont pu être reliés à la courbe n
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Firat, Seyhan. "Critical assessment of existing slope stability formulae and application to slope stabilisation." Thesis, University of South Wales, 1998. https://pure.southwales.ac.uk/en/studentthesis/critical-assessment-of-existing-slope-stability-formulae-and-application-to-slope-stabilisation(339ddd93-e0c1-466d-8278-143beca4fb20).html.

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In this research, extensive use has been made of limit equilibrium methods of analysis for studying the stability of slopes. For the determination of the factor of safety (FOS) of slopes, the usual two-step process has been adopted; (a) assuming a slip surface for the soil mass, and (b) using the appropriate limit equilibrium equation(s). Eight wellknown limit equilibrium methods have been programmed to calculate different FOS values. The comparative performance of the various analyses has been carried out successfully using case studies. The innovative use of Gauss quadrature to calculate the
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Salinas, Hervé. "Stabilité linéaire et faiblement non linéaire d'une couche limite laminaire compressible tridimensionnelle par l'approche PSE." Toulouse, ENSAE, 1998. http://www.theses.fr/1998ESAE0024.

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45

Prasad, Anamika 1979. "Development of user interface for numerical limit analysis of geotechnical stability problems." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/85751.

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46

Souchet, Michel. "Etude de stabilite d'une couche limite thermocapillaire avec surface libre deformable." Paris 6, 1991. http://www.theses.fr/1991PA066639.

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La transition vers la turbulence des ecoulements thermocapillaires est encore mal connue aujourd'hui. Nous nous sommes propose d'etudier ici la stabilite d'un tel ecoulement, avec surface libre deformable. Un logiciel de calcul de stabilite lineaire a ete developpe permettant de determiner mes courbes de stabilite neutre. Cet outil nous a permis de mettre en evidence deux grandes classes d'instabilite: les ondes convectives thermocapillaires, les ondes de surface. Aux faibles longueurs d'onde le mode privilegie sera une onde convective oblique a 80; la surface reste plane dans ce cas. Alors qu
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47

Vandenbussche, Cédric. "Stabilité des strucutres en géotechnique : approche micro-macro et charges limites." Chambéry, 2006. http://www.theses.fr/2006CHAMS042.

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Cette thèse consiste en l'étude de l'influence de la porosité sur le comportement plastique des matériaux type sol poreux et surtout sur la présence de points anguleux sur leur tracé de critère. Le matériau étudié, rigide parfaitement plastique, présente des cavités cylindriques ou sphériques disposées aléatoirement. Il sera appelé dans la suite « Coulomb poreux », la matrice répondant au critère de Coulomb. Nous adopterons pour l'étudier le modèle proposé par Gurson. Comme il l'avait fait dans son travail de 77, nous utiliserons les deux approches de l'analyse limite pour en déduire le critèr
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48

Paddick, Matthew. "Stabilité de couches limites et d'ondes solitaires en mécanique des fluides." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S049/document.

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La présente thèse traite de deux questions de stabilité en mécanique des fluides. Les deux premiers résultats de la thèse sont consacrés au problème de la limite non-visqueuse pour les équations de Navier-Stokes. Il s'agit de déterminer si une famille de solutions de Navier-Stokes dans un demi-espace avec une condition de Navier au bord converge vers une solution du modèle non visqueux, l'équation d'Euler, lorsque les paramètres de viscosité tendent vers zéro. Dans un premier temps, on considère le modèle incompressible 2D. Nous obtenons la convergence dans L2 des solutions faibles de Navier-S
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Zhu, Ruoxi. "Online Voltage Stability Monitoring and Control Using Limited Synchrophasor Measurements." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/97197.

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As the scale and complexity of an interconnected power grid has increased significantly, power systems can be operated close to the verge of voltage instability. With the application of Phasor Measurement Units (PMUs), dispatchers are able to monitor long term voltage stability in a real time operational environment. This research addresses the critical issues by proposing three different methods. Voltage Stability Assessment Index (VSAI) is a Thévenin Equivalent (TE) based method considering voltage dynamic mechanisms. To extend the model from one load bus to a critical load center, Optimal P
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Calliero, Taís Ruoso. "Um princípio de invariância para sistemas discretos." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-01022016-145236/.

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Muitos sistemas físicos são modelados por sistemas dinâmicos discretos. Com o advento da tecnologia digital os sistemas discretos tornaram-se ainda mais importantes, sendo assim, o desenvolvimento de ferramentas analíticas para este tipo de sistema é de grande importância. Neste trabalho, estudam-se alguns dos principais resultados relacionados à estabilidade de sistemas dinâmicos discretos, e alguns novos são propostos. É bem conhecido na literatura que a estabilidade de um ponto de equilíbrio pode ser caracterizada pelo Método Direto de Lyapunov, via uma função auxiliar denominada função
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