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Dissertations / Theses on the topic 'Periodical conditions'

Author: Grafiati

Published: 12 October 2024

Last updated: 31 July 2025

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1

Dean, Camille K. "True Religion: Reflections of British Churches and the New Poor Law in the Periodical Press of 1834." Thesis, University of North Texas, 1993. https://digital.library.unt.edu/ark:/67531/metadc278395/.

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This study examined public perception of the social relevance of Christian churches in the year the New Poor Law was passed. The first two chapters presented historiography concerning the Voluntary crisis which threatened the Anglican establishment, and the relationship of Christian churches to the New Poor Law. Chapters 4, 5, and 6 revealed the recurring image of "true" Christianity in its relation to the church crisis and the New Poor Law in the working men's, political, and religious periodical press. The study demonstrated a particular working class interest in Christianity and the effect

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2

Chamaillard, Mathieu. "Effective boundary conditions for thin periodic coatings." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLY001.

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Nous avons traité le cas de l'équation scalaire de Helmholtz. Nous allons tenter de traiter le cas des équations de Maxwell. On s'intéressera aux cas des méta-matériaux. Dans un premier cas la permittivité est négative dans la couche mince et dans le deuxième cas la perméabilité est en (1/delta)^2<br>We have dealt with the case of the scalar Helmholtz equation. We will try to handle the case of Maxwell's equation. We also will focus on the case of meta-materials. In a first case the permittivity is negative in the thin layer and in the second case is the permeability (1/delta) ^ 2

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3

Shepherd, Roger. "Coupled non-linear diffusion under periodic boundary conditions." Thesis, University of South Wales, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239985.

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4

Africa, African People's Democratic Union of Southern. "The Apdusan: African People's Democratic Union of Southern Africa." African People's Democratic Union of Southern Africa, 1999. http://hdl.handle.net/10962/76095.

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After many deadlocks, accusations of negotiating in bad faith, marches and lunch-time pickets, more than 600,000 Public Sector Workers went on strike on 24 August 1999. The government then unilaterally implemented a 6.3% increase for public servants against their original demand of 10-15% increase. "The dispute goes back to January 1999, to a workshop dealing with the budgetary process. At this meeting the Department of Finance outlined its Medium-Term Expenditure Framework, for the first time to the public sector workers. In the MTEF the parameters for wage cuts, and 'non-negotiability’ were

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5

Legan, J. D. "Bacterial competition for methylamine under conditions of periodic nutrient alternation." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354086.

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6

Poling, David R. "Airfoil response to periodic disturbances: the unsteady Kutta condition." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76166.

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Unsteady flow fields over a NACA 0012 at an angle of attack are investigated. The first is the classical pitching motion about the airfoil's quarter chord. The second is the flow over a fixed airfoil immersed in the wake of the pitching airfoil. Large reduced frequencies are considered. Measurements were obtained in a water tunnel by Laser-Doppler velocimetry. Ensemble-averaged velocity measurements were obtained in the vicinity of the trailing edges of both the pitching and the fixed airfoils. The flowfields in the wake and at the trailing edges of both airfoils were studied visually. The val

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7

Anderson, Mark Jule Jr. "Cooperative Behavior in Driven Lattice Systems with Shifted Periodic Boundary Conditions." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30606.

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We explore the nature of driven stochastic lattice systems with non-periodic boundary conditions. The systems consist of particle and holes which move by exchanges of nearest neighbor particle-hole pairs. These exchanges are controlled by the energetics associated with an internal Hamiltonian, an external drive and a stochastic coupling to a heat reservoir. The effect of the drive is to bias particle-hole exchanges along the field in such a way that a particle current can be established. Hard-core volume constraints limit the occupation of only one particle (hole) per lattice site. For certain

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8

Schwinte, Valentin. "Autour de l'équation du plus bas niveau de Landau." Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0078.

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Cette thèse a pour objet l'étude de l'équation du plus bas niveau de Landau, dans plusieurs contextes pertinents en physique et provient des modèles pour les condensats de Bose-Einstein. Nous nous penchons spécifiquement sur trois aspects liés à l'équation. Le premier est l'étude d'une classe de solutions appelées ondes stationnaires, à travers la minimisation d'une fonctionnelle énergie. Nous montrons notamment que la gaussienne est l'unique minimiseur global à symétries près pour un certain paramètre, à l'aide d'algèbre linéaire et bilinéaire. Le deuxième point concerne la conjecture de rése

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9

Kabadshow, Ivo [Verfasser]. "Periodic Boundary Conditions and the Error-Controlled Fast Multipole Method / Ivo Kabadshow." Wuppertal : Universitätsbibliothek Wuppertal, 2012. http://d-nb.info/1020476176/34.

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10

Sanchez, Juan Eusebio. "Semiconductor device simulation of low-frequency noise under periodic large-signal conditions." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1001178.

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11

Date, James Charles. "Performance prediction of high lift rudders operating under steady and periodic flow conditions." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390722.

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12

Granat, Robert. "Algorithms and Library Software for Periodic and Parallel Eigenvalue Reordering and Sylvester-Type Matrix Equations with Condition Estimation." Doctoral thesis, Umeå : Department of Computing Science, Umeå Univ, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1415.

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13

Rattermann, Dale N. "A Fast Poisson Solver with Periodic Boundary Conditions for GPU Clusters in Various Configurations." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397233840.

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14

Rogers, Daniel R. "Design of a Three-Passage Low Reynolds Number Turbine Cascade with Periodic Flow Conditions." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2684.pdf.

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15

Amenoagbadji, Pierre. "Wave propagation in quasi-periodic media." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE020.

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L'objectif de la thèse est de développer des méthodes numériques originales pour la résolution de l'équation des ondes en régime harmonique dans des milieux quasi-périodiques, dans l'esprit des méthodes développées précédemment pour des milieux périodiques. L'idée est d'utiliser comme dans des travaux d'homogénéisation quasi-périodique le fait que l'étude d'une EDP elliptique avec des coefficients quasi-périodiques se ramène à l'étude d'une EDP elliptiquement dégénérée en dimension supérieure, mais dont les coefficients sont périodiques. Le caractère périodique permet d'utiliser des outils ada

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16

Fu, Man. "A Study of Stock Market Fluctuations and their Relations to Business Conditions." FIU Digital Commons, 2009. http://digitalcommons.fiu.edu/etd/89.

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Most research on stock prices is based on the present value model or the more general consumption-based model. When applied to real economic data, both of them are found unable to account for both the stock price level and its volatility. Three essays here attempt to both build a more realistic model, and to check whether there is still room for bubbles in explaining fluctuations in stock prices. In the second chapter, several innovations are simultaneously incorporated into the traditional present value model in order to produce more accurate model-based fundamental prices. These innovations

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17

Kuczyński, Waldemar. "Investigation into boiling in the refrigerant flow under the conditions of periodically generated disturbance : PhD thesis summary." Rozprawa doktorska, [s.n.], 2009. http://dlibra.tu.koszalin.pl/Content/1197.

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18

Cai, Yong. "Finite-element time- domain modelling of periodic structures with floquet modal absorbing boundry condition." Thesis, University of Warwick, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487809.

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19

Neves, Maxstaley Leninyuri. "A condition-based maintenance policy and input parametersestimation for deteriorating systems under periodic inspection." Universidade Federal de Minas Gerais, 2010. http://hdl.handle.net/1843/BUOS-8C8E4A.

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We study the problem of proposing Condition-Based Maintenance policies for machines and equipments. Our approach combines an optimization model and input parameters estimation from empirical data.The system deterioration is described by discrete states ordered from thestate \as good as new" to the state \completely failed". At each periodicinspection, whose outcome might not be accurate, a decision has to be made between continuing to operate the system or stopping and performing its preventive maintenance. This decision-making problem is discussed and we tackle it by using an optimization mod

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20

Thai, Ngoc Nguyen [Verfasser], Ingo [Akademischer Betreuer] [Gutachter] Witt, and Wolfram [Gutachter] Bauer. "Radiation conditions for periodic potentials / Nguyen Thai Ngoc ; Gutachter: Ingo Witt, Wolfram Bauer ; Betreuer: Ingo Witt." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://d-nb.info/1140222910/34.

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21

Hayakawa, Naoki, and Hitoshi Okubo. "Partial discharge characteristics of inverter-fed motor coil samples under ac and surge voltage conditions." IEEE, 2005. http://hdl.handle.net/2237/6764.

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22

Nestler, Franziska. "An NFFT based approach to the efficient computation of dipole-dipole interactions under different periodic boundary conditions." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-171040.

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We present an efficient method to compute the electrostatic fields, torques and forces in dipolar systems, which is based on the fast Fourier transform for nonequispaced data (NFFT). We consider 3d-periodic, 2d-periodic, 1d-periodic as well as 0d-periodic (open) boundary conditions. The method is based on the corresponding Ewald formulas, which immediately lead to an efficient algorithm only in the 3d-periodic case. In the other cases we apply the NFFT based fast summation in order to approximate the contributions of the nonperiodic dimensions in Fourier space. This is done by regularizing or

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23

Alzabut, Jehad. "Periodic Solutions And Stability Of Linear Impulsive Delay Differential Equations." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12604901/index.pdf.

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In this thesis, we investigate impulsive differential systems with delays of the form And more generally of the form The dissertation consists of five chapters. The first chapter serves as introduction, contains preliminary considerations and assertions that will be encountered in the sequel. In chapter 2, we construct the adjoint systems and obtain the variation of parameters formulas of the solutions in terms of fundamental matrices. The asymptotic behavior of solutions of systems satisfying the Perron co

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24

Höhn, Tomáš. "Modelování kmitočtově selektivních povrchů v programu COMSOL Multiphysics." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217463.

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Metoda konečných prvků implementovaná v programu COMSOL Multiphysics je využívána k analýze tzv. free-standing kmitočtově selektivních povrchů ve 3D. Tyto modely jsou následně doplněny o periodické okrajové podmínky. Dále jsou free-standing povrchy doplněny o vrstvy dielektrika a je zkoumán jejich vliv na modul činitele odrazu. V analytické části jsou vyhodnoceny vlivy počtu elementů diskretizační mřížky na přesnost výsledku a délku výpočtů. Výsledky jsou srovnávány vzhledem k výsledkům uvedeným v literatuře [5]. V závěrečné části práce je vysvětlen postup při generování m-file pro obdélníkový

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25

Ward, Thomas Boulton. "Topological entropy and periodic points for Zd actions on compact abelian groups with the Descending Chain Condition." Thesis, University of Warwick, 1989. http://wrap.warwick.ac.uk/73322/.

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This thesis deals with the ergodic theory of actions of Zd on compact abelian groups satisfying a regularity condition: the descending chain condition. Using results of Klaus Schmidt, Bruce Kitchens and Doug Lind, we show that the descending chain condition guarantees that the global topological entropy of such an action coincides with the growth rate of periodic points whenever this exists (§II.3). This links the global entropy to the dynamics of such systems and allows the global entropy to be computed for some important examples (§II4). The algebraic entropy of a Zd action on a discrete abe

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26

Jia, H.-X., G. Xi, L. Müller, R. Mailach, and K. Vogeler. "Effect of clocking on unsteady rotor blade loading in a low-speed axial compressor at design and off-design operating conditions." Sage, 2008. https://publish.fid-move.qucosa.de/id/qucosa%3A38439.

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This paper presents the results of stator clocking investigations at a design point and an operating point near the stability limit in a low-speed research compressor (LSRC). The unsteady flow field of the LSRC at several clocking configurations was investigated using a three-dimensional unsteady, viscous solver. The unsteady pressure on the rotor blades at midspan (MS) was measured using time-resolving piezoresistive miniature pressure transducers. The effect of clocking on the unsteady pressure fluctuation at MS on the rotor blades is discussed for different operating points. Based on the un

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27

Zhang, Peng. "Systèmes elliptiques issus de la modélisation des supraconducteurs." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1115/document.

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Ce travail porte sur des équations aux dérivées partielles issues de la physique mathématique, plus particulièrement sur celles régissant la supraconductivité. Ainsi, la majorité du travail concerne le modèle de Ginzburg-Landau, qui est un modèle macroscopique de supraconducteurs de type-II. Ce travail est divisé en deux parties principales: La première partie se focalise sur l'analyse des vortex du modèle de Ginzburg-Landau en deux dimensions pour les supraconducteurs de type-II, modèle conduisant à une estimation de la variation du nombre de vortex et à l'optimalité du réseau d'Abrikosov par

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28

Asselle, Luca [Verfasser], Alberto [Akademischer Betreuer] Abbondandolo, and Gerhard [Akademischer Betreuer] Knieper. "On the existence of orbits satisfying periodic or conormal boundary conditions for Euler-Lagrange flows / Luca Asselle. Gutachter: Alberto Abbondandolo ; Gerhard Knieper." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1089007183/34.

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29

Garrione, Maurizio. "Existence and multiplicity of solutions to boundary value problems associated with nonlinear first order planar systems." Doctoral thesis, SISSA, 2012. http://hdl.handle.net/20.500.11767/4930.

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The monograph is devoted to the study of nonlinear first order systems in the plane where the principal term is the gradient of a positive and positively 2-homogeneous Hamiltonian (or the convex combination of two of such gradients). After some preliminaries about positively 2-homogeneous autonomous systems, some results of existence and multiplicity of T-periodic solutions are presented in case of bounded or sublinear nonlinear perturbations. Our attention is mainly focused on the occurrence of resonance phenomena, and the corresponding results rely essentially on conditions of Landesman-Laz

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30

Chew, Wendy Poh Yoke. "Consuming femininity : nation-state, gender and Singaporean Chinese women." University of Western Australia. School of Humanities, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0135.

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My research seeks to understand ways in which English-educated Chinese women in cosmopolitan Singapore bolstered their identity while living under the influences of Confucian values, patriarchal nation-building and racial concerns. My thesis examines women who have themselves been lost in translation when they were co-opted into the creation of a viable state after 1965. Often women are treated as adjuncts in the patriarchal state, particularly since issues of gender are not treated with the equality they deserve in the neo-Confucian discourse. This thesis takes an unconventional approach to h

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31

Kambisseri, Roby Neelu. "Wireless communication using metasurfaces for condition monitoring in motor." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246051.

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Wireless sensors are used widely for condition monitoring in electric machines. The metal enclosure of an electric motor restricts the signal from sensors to radiate outside. The signal from the metal cavity needs to be guided to the only opening in the enclosure, through a narrow gap between the stator and the rotating rotor. Gap waveguide technology is proposed as a solution by texturing the stator surface with electromagnetic band gap (EBG) structures. Arrays of periodic holey structures are used to realize the metasurface waveguide. Two Bravais lattice structures – square and hexagonal, ar

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32

Nandamuri, Sasank Sai. "A Multiscale Computational Study of the Mechanical Properties of the Human Stratum Corneum." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458300092.

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33

Ozturk, Burak. "Combined effects of Reynolds number, turbulence intensity and periodic unsteady wake flow conditions on boundary layer development and heat transfer of a low pressure turbine blade." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1150.

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34

Riihimäki, Eva-Stina. "A Theoretical Investigation of the Octapeptide Region in the Human Prion Protein." Doctoral thesis, KTH, Kemi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4423.

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Den kopparbindande egenskapen hos prionproteiner är sannolikt kopplad till proteinets funtion. Det mänskliga prionproteinet innehåller ett kopparbindande oktapeptidområde, där PHGGGWGQ-sekvensen upprepas fyra gånger i följd. Syftet med detta arbete är att undersöka strukturen och dynamiken i oktapeptidområdet genom att använda teoretiska metoder. Med kvantkemisk strukturoptimering genomfördes en detaljerad jämförelse av växelverkan mellan flera katjoner och det kopparbindande området. Enligt dessa beräkningar är rodium(III) en möjlig ersättare för koppar(II) i NMR-specktroskopiska koordination

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35

Nespoulet, Hugo. "Oxygénation en conditions hypoxiques : rôle de la chémosensibilité sur la tolérance à l'altitude, plasticité et amélioration par pression positive expiratoire." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENS041/document.

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A l'éveil comme au cours du sommeil, en plaine comme en haute altitude, le maintien d'une oxygénation artérielle stable et élevée est un marqueur essentiel d'une bonne réponse physiologique de l'organisme. L'intolérance à l'altitude regroupe des pathologies graves voire fatales dont le développement est en lien direct avec le taux d'oxygénation artériel des sujets. D'autre part, en plaine, la prévalence élevée du syndrome d'apnées obstructives du sommeil (SAOS) incite les chercheurs au développement de modèles d'études spécifiques, permettant d'investiguer les conséquences du principal stimulu

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Raimbault, Nathaniel. "Gauge-invariant magnetic properties from the current." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30179/document.

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De nombreux phénomènes physiques ne peuvent être compris qu'en s'intéressant à la structure électronique. Cette dernière peut être interprétée en termes de propriétés électromagnétiques, chacune de ces propriétés révélant diverses informations sur le système étudié. Il est donc important d'avoir des outils efficaces afin de calculer de telles propriétés. C'est dans ce contexte que cette thèse a été écrite, notre principal objectif ayant été de développer une méthode générale donnant accès à une vaste gamme de propriétés électromagnétiques. Dans la première partie de cette thèse, nous décrivons

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37

Jangara, Juliana. "“Beautiful powerful you” : an analysis of the subject positions offered to women readers of Destiny magazine." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1013395.

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Women's magazines are popular cultural forms which offer readers representations intended to advise women on how to work towards and achieve idealised femininities. They perform such a function within the wider socio-historical context of gender relations. In a country such as South Africa, where patriarchal gender relations have historically been structured to favour men over women and masculinity over femininity, the representation of femininity in contemporary women's magazines may serve to reinforce or challenge these existent unequal gender relations. Informed by a feminist poststructural

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38

See, Chan H. "Computation of electromagnetic fields in assemblages of biological cells using a modified finite difference time domain scheme. Computational electromagnetic methods using quasi-static approximate version of FDTD, modified Berenger absorbing boundary and Floquet periodic boundary conditions to investigate the phenomena in the interaction between EM fields and biological systems." Thesis, University of Bradford, 2007. http://hdl.handle.net/10454/4762.

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yes<br>There is an increasing need for accurate models describing the electrical behaviour of individual biological cells exposed to electromagnetic fields. In this area of solving linear problem, the most frequently used technique for computing the EM field is the Finite-Difference Time-Domain (FDTD) method. When modelling objects that are small compared with the wavelength, for example biological cells at radio frequencies, the standard Finite-Difference Time-Domain (FDTD) method requires extremely small time-step sizes, which may lead to excessive computation times. The problem can be overc

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39

Maati, Amel. "Mise en œuvre de formalismes pour la modélisation de grands réseaux périodiques d'antennes." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0009/document.

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Cette thèse se place dans le contexte général de la modélisation de réseaux d’antennes de grande taille, avec pour objectif d’atteindre un niveau de précision suffisamment élevé pour permettre une optimisation complète des performances et en particulier une amélioration de l’efficacité énergétique. Partant du constat que l’optimisation électromagnétique de grands réseaux représente un verrou si les couplages doivent être modélisés efficacement, cette thèse propose la mise en œuvre d’une méthode permettant la modélisation fine de grands réseaux d'antennes tout en réduisant les temps de calcul e

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40

Lee, Richard Todd. "A novel method for incorporating periodic boundaries into the FDTD method and the application to the study of structural color of insects." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29772.

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Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Smith, Glenn; Committee Member: Buck, John; Committee Member: Goldsztein, Guillermo; Committee Member: Peterson, Andrew; Committee Member: Scott, Waymond. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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41

See, Chan Hwang. "Computation of electromagnetic fields in assemblages of biological cells using a modified finite difference time domain scheme : computational electromagnetic methods using quasi-static approximate version of FDTD, modified Berenger absorbing boundary and Floquet periodic boundary conditions to investigate the phenomena in the interaction between EM fields and biological systems." Thesis, University of Bradford, 2007. http://hdl.handle.net/10454/4762.

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There is an increasing need for accurate models describing the electrical behaviour of individual biological cells exposed to electromagnetic fields. In this area of solving linear problem, the most frequently used technique for computing the EM field is the Finite-Difference Time-Domain (FDTD) method. When modelling objects that are small compared with the wavelength, for example biological cells at radio frequencies, the standard Finite-Difference Time-Domain (FDTD) method requires extremely small time-step sizes, which may lead to excessive computation times. The problem can be overcome by

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42

Musgrave, Jeffrey. "Integrodifference Equations in Patchy Landscapes." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26129.

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In this dissertation, we study integrodifference equations in patchy landscapes. Specifically, we provide a framework for linking individual dispersal behavior with population-level dynamics in patchy landscapes by integrating recent advances in modeling dispersal into an integrodifference equation. First, we formulate a random-walk model in a patchy landscape with patch-dependent diffusion, settling, and mortality rates. We incorporate mechanisms for individual behavior at an interface which, in general, results in the probability-density function of the random walker being discontinuous

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Alqawasmeh, Yousef. "Models for Persistence and Spread of Structured Populations in Patchy Landscapes." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36845.

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In this dissertation, we are interested in the dynamics of spatially distributed populations. In particular, we focus on persistence conditions and minimal traveling periodic wave speeds for stage-structured populations in heterogeneous landscapes. The model includes structured populations of two age groups, juveniles and adults, in patchy landscapes. First, we present a stage-structured population model, where we divide the population into pre-reproductive and reproductive stages. We assume that all parameters of the two age groups are piecewise constant functions in space. We derive expli

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44

Råsmark, Per Johan. "On the Structure and Dynamics of Polyelectrolyte Gel Systems and Gel-surfactant Complexes." Doctoral thesis, Uppsala universitet, Fysikalisk-kemiska institutionen, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4652.

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This thesis describes the results of experimental work on polyelectrolyte gels and their interaction with oppositely charged surfactants, and presents two new algorithms applicable to the simulation of colloid and polymer systems. The model systems investigated were crosslinked poly(acrylate) (PA) and poly(styrene sulphonate) (PSS), and the surfactant was dodecyl trimethylammonium bromide (DoTAB). Pure gel materials were studied using dynamic light scattering. It was shown that the diffusion coefficient (D) increases with increasing degree of swelling and the concentration dependence is larger

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Laino, Teodoro. "Multigrid QM/MM approaches in ab initio molecular dynamics." Doctoral thesis, Scuola Normale Superiore, 2006. http://hdl.handle.net/11384/85799.

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Navarrete, Manuel Alejandro Gonzalez. "Modelo de Ising ferromagnético com campo externo periódico." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-28082015-000711/.

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Estudamos o diagrama de fases para uma classe de modelos de Ising ferromagnéticos em $ \\mathbb^2 $, com campo magnético externo periódico. O campo externo assume dois valores: $ h $ e $ -h $, onde $ h> 0 $. Os sítios associados a valores positivos e negativos do campo externo, formam uma configuração em forma de tabuleiro de xadrez (nós chamamos de {\\it cell-board configuration}), com células retangulares de tamanho $ L_1 \\times L_2 $ sítios, de tal forma que o valor total do campo externo é zero. Como principal resultado, mostramos a presença de uma transição de fase de primeira ordem. A t

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Rouot, Jérémy. "Méthodes géométriques et numériques en contrôle optimal et applications au transfert orbital à poussée faible et à la nage à faible nombre de Reynolds." Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4103/document.

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Dans la première partie, on propose une étude sur le problème de nage à faible nombre de Reynolds à partir d'unnageur modélisant la nage des copépodes et du nageur historique de Purcell.En minimisant l’énergie dissipée par les forces de trainée sur le fluide, laquelle est reliée au concept d’efficacitéd’une nage, on utilise les outils géométriques et numériques du contrôle optimal. Le principe du maximum estutilisé pour calculer les contrôles optimaux périodiques satisfaisant une condition de transversalité fine reliée à laminimisation de l’énergie mécanique pour un déplacement fixé où à la ma

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Nascimento, Moisés Aparecido do. "Hipoelipticidade global de campos vetoriais no toro TN." Universidade Federal de São Carlos, 2010. https://repositorio.ufscar.br/handle/ufscar/5869.

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Made available in DSpace on 2016-06-02T20:28:25Z (GMT). No. of bitstreams: 1 3207.pdf: 939340 bytes, checksum: b708a600566bb7e50aa91c249a665893 (MD5) Previous issue date: 2010-06-21<br>In this work, we will see that if the transpose operator of a smooth real vector field L defined on the N-dimensional torus, regarded as a linear differential operator with coefficients in C1(TN), is globally hypoelliptic, then there exists a vector field with constant coefficients L0 such that L and L0 are C1-conjugated, with such constants satisfying a condition called Diofantina (*). We will also show the c

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Boulmé, Audren. "Conception et caractérisation de sondes cMUT large bande pour l'imagerie conventionnelle et l'évaluation du tissu osseux." Thesis, Tours, 2013. http://www.theses.fr/2013TOUR3319/document.

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Les transducteurs ultrasonores capacitifs micro-usinés (cMUT : capacitive Micromachined Ultrasound Transducers) apparaissent, au vu de leur maturité croissante, comme une alternative de plus en plus viable à la technologie piézoélectrique. Caractérisés par une large bande passante et une large directivité, ces transducteurs sont des solutions intéressantes pour le développement de sondes ultrasonores « exotiques » dont les spécifications sont difficilement atteignables en technologie piézoélectrique. C'est dans ce contexte et fort de l'expérience acquise par notre laboratoire sur cette technol

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Oliveira, Gustavo Charles Peixoto de. "Jato transversal de gotas: simulações por ALE/FEM e efeitos interfaciais." Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8094.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Um código computacional para escoamentos bifásicos incorporando metodologia híbrida entre oMétodo dos Elementos Finitos e a descrição Lagrangeana-Euleriana Arbitrária do movimento é usado para simular a dinâmica de um jato transversal de gotas na zona primária de quebra. Os corpos dispersos são descritos por meio de um método do tipo front-tracking que produz interfaces de espessura zero através de malhas formadas pela união de elementos adjacentes em ambas as fases e de técnicas de refinamento adaptativo. Condições de contorno per

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