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Dissertations / Theses on the topic 'Monodomain'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 April 2022

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1

Choi, Jinsub. "Fabrication of monodomain porous alumina using nanoimprint lithography and its applications." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970954050.

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2

Boey, Edward. "Anisotropic Residual-Based Mesh Adaptation for Reaction-Diffusion Systems: Applications to Cardiac Electrophysiology." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35614.

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Accurate numerical simulation of reaction-diffusion systems can come with a high cost. A system may be stiff, and solutions may exhibit sharp localized features that require fine grids and small time steps to properly resolve the physical phenomena they represent. The development of efficient methods is crucial to cut down the demands of computational resources. In this thesis we consider the use of adaptive space and time methods driven by a posteriori error estimation. The error estimators for the spatial discretization are built from a variety of sources: the residual of the partial diff

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3

Cloherty, Shaun Liam Graduate School of Biomedical Engineering Faculty of Engineering UNSW. "Cellular interaction in the cardiac pacemaker: a modelling study." Awarded by:University of New South Wales. Graduate School of Biomedical Engineering, 2005. http://handle.unsw.edu.au/1959.4/22512.

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In mammalian hearts, initiation of the heartbeat occurs in a region of specialised pacemaker cells known as the sinoatrial node (SAN). The SAN is a highly complex spatially distributed structure which displays considerable cellular heterogeneity and is subject to complex electrotonic interactions with the surrounding atrial tissue. In this study, biophysically detailed ionic models of central and peripheral SAN pacemaker cells are described. These models are able to accurately reproduce experimental recordings of the membrane potential from central and peripheral SAN tissue. These models are

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4

Běleja, Marek. "Modelování šíření akčního potenciálu v myokardu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219639.

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The work deals with the foundations of bioelectric phenomena cardiomyocyte, then it is also part of this description of the heart conduction system and method of distribution in this system The next section is a description of the spread in the system, the very essence of the spread. In the last chapter analyzes the theory for the creation of computational models, which extend in one dimension or two dimensions

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5

Douanla, Lontsi Charlie. "Schémas d'ordre élevé pour des simulations réalistes en électrophysiologie cardiaque." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0752/document.

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Les simulations numériques réalistes en électrophysiologie cardiaque ont un coût de calcul extrêmement élevé. Ce coût s’explique en grande partie par la raideur, à la fois en temps et en espace, d’une onde de « potentiel d’action » (PA). Par ailleurs, les phénomènes observés sont très instationnaires et s’étudient en temps long. Une description précise de la dynamique des PA est cruciale pour construire des modèles numériques pertinents d’un point de vue médical ou clinique. Cet aspect fondamental ne peut être contourné dans les études numériques réalistes.La raideur de l’onde de PA ne peut êt

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6

Campos, Joventino de Oliveira. "Método de lattice Boltzmann para simulação da eletrofisiologia cardíaca em paralelo usando GPU." Universidade Federal de Juiz de Fora (UFJF), 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/3555.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-03-06T20:24:42Z No. of bitstreams: 1 joventinodeoliveiracampos.pdf: 3604904 bytes, checksum: aca8053f097ddcb9d96ba51186838610 (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-03-06T20:27:39Z (GMT) No. of bitstreams: 1 joventinodeoliveiracampos.pdf: 3604904 bytes, checksum: aca8053f097ddcb9d96ba51186838610 (MD5)<br>Made available in DSpace on 2017-03-06T20:27:39Z (GMT). No. of bitstreams: 1 joventinodeoliveiracampos.pdf: 3604904 bytes, checksum: aca8053f097ddcb9d96ba51186838610 (MD5)

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7

Souza, Daniel Moutinho de. "Avaliação da influência da estrutura vascular no processo de desfibrilação cardíaca via simulações computacionais." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6090.

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Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-01-11T14:38:55Z No. of bitstreams: 1 danielmoutinhodesouza.pdf: 14087574 bytes, checksum: 14fbe9db31be8496c781a98af92ca3fd (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-01-23T13:42:47Z (GMT) No. of bitstreams: 1 danielmoutinhodesouza.pdf: 14087574 bytes, checksum: 14fbe9db31be8496c781a98af92ca3fd (MD5)<br>Made available in DSpace on 2018-01-23T13:42:47Z (GMT). No. of bitstreams: 1 danielmoutinhodesouza.pdf: 14087574 bytes, checksum: 14fbe9db31be8496c781a98af92ca3fd (MD5) Previous

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8

Arthurs, Christopher J. "Efficient simulation of cardiac electrical propagation using adaptive high-order finite elements." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:ad31f06f-c4ed-4c48-b978-1ef3b12fe7a1.

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This thesis investigates the high-order hierarchical finite element method, also known as the finite element p-version, as a computationally-efficient technique for generating numerical solutions to the cardiac monodomain equation. We first present it as a uniform-order method, and through an a priori error bound we explain why the associated cardiac cell model must be thought of as a PDE and approximated to high-order in order to obtain the accuracy that the p-version is capable of. We perform simulations demonstrating that the achieved error agrees very well with the a priori error bound. Fu

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9

Gu, Dongfeng. "The viscoelastic properties of nematic monodomains containing liquid crystal polymers." Case Western Reserve University School of Graduate Studies / OhioLINK, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=case1057759399.

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10

Reeves, Sarah J. "Novel routes for the formation of liquid crystal polymer and elastomer monodomains." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412186.

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11

Isfort, Dirk. "Croissance de grands monodomaines d'YBa2Cu3Ox et limitation du courant." Université Joseph Fourier (Grenoble), 2002. http://www.theses.fr/2002GRE10046.

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La limitation du courant est une application nouvelle et prometteuse pour les matériaux supraconducteurs à haute température critique. Nous avons étudié la possibilité de limiter le courant avec des échantillons découpés suivant les deux directions principales du matériau YbaCuO texturé, les plans ab et l'axe c. Un procédé de croissance isotherme des monodomaines d'YbaCuO a été mis au point et la qualité de croissance des monodomaines YbaCuO améliorée. Des monodomaines de 100 mm diamètre (plan ab) ont été élaborés, la hauteur des cristaux en direction c atteint 30 mm. Pour les plans ab, les ex

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12

DEY, SONAL. "ELASTICITY OF MAIN CHAIN LIQUID CRYSTAL ELASTOMERS AND ITS RELATIONSHIP TO LIQUID CRYSTAL MICROSTRUCTURE." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1385403238.

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13

Chen, Yuan. "Advanced liquid crystal materials for display and photonic applications." Doctoral diss., University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6261.

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Thin-film-transistor (TFT) liquid crystal display (LCD) has been widely used in smartphones, pads, laptops, computer monitors, and large screen televisions, just to name a few. A great deal of effort has been delved into wide viewing angle, high resolution, low power consumption, and vivid color. However, relatively slow response time and low transmittance remain as technical challenges. To improve response time, several approaches have been developed, such as low viscosity liquid crystals, overdrive and undershoot voltage schemes, thin cell gap with a high birefringence liquid crystal, and el

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14

STEIN, PASCAL. "Etude experimentale des proprietes mecaniques des elastomeres cristaux liquides a chaines laterales de type polydomaine et monodomaine." Université Louis Pasteur (Strasbourg) (1971-2008), 2000. http://www.theses.fr/2000STR13046.

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Le travail presente dans cette these a pour but de caracteriser les proprietes mecaniques d'elastomeres nematiques et smectiques de type polydomaine et monodomaine, et de determiner les mecanismes qui les gouvernent. Les experiences ont ete effectuees a l'aide de techniques de piezo-rheologie qui soumettent les materiaux a des deformations de cisaillement et de compression tres faibles (<10 3) dans une gamme de frequence tres large (0. 02 hz a 10 4 hz). Les resultats obtenus dans la phase isotrope de tous les composes etudies montrent que la partie reelle du module de cisaillement g est la som

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15

Cao, Haitao. "Etude des mécanismes de préparation par infiltration croissance assité par germe de massif supraconducteur à haute température YBCO monodomaine." Caen, 2010. http://www.theses.fr/2010CAEN2045.

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L’énorme engouement qu’a connu l’étude des supraconducteurs, particulièrement depuis l’émergence des oxydes supraconducteurs, est bien, comme en témoigne le nombre de prix Nobel obtenus sur ce sujet. Les applications potentielles sont le transport de courant, l’imagerie médicale,. . . Les oxydes supraconducteurs ayant des propriétés intéressantes à la température de l’azote liquide sont à l’origine de nombreux travaux depuis leur découverte en 1987. Dans le cadre de ce travail, le procédé de texturation d’YBa2Cu3O7- par la méthode d’infiltration assistée par un germe a été développé. Ce procé

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16

Maillard, Alain. "Préparation après croissance d'échantillons monodomaines de BaTiO3 en vue d'utilisation optique : mesures holographiques sous champ électrique appliqué." Dijon, 1989. http://www.theses.fr/1989DIJOS005.

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Un processus de préparation d'échantillons monodomaines de titanate de baryum est décrit, il est associé à un ensemble de techniques permettant d'effectuer un contrôle de la qualité. Ces cristaux après traitement sont caractérisés optiquement par la mesure des coefficients électrooptiques r13 et r33. Le signe des porteurs de charge est déterminé positif. La réalisation d'une mesure originale du déphasage entre le réseau d'indice de réfraction et le réseau d'illumination permet d'atteindre la densité de pièges mis en jeu lors des enregistrements holographiques. Une étude de l'effet d'un champ é

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17

Zhang, Cui Ping. "Elaboration de larges monodomaines de supraconducteurs YBaCuO pour application au piégeage de champ magnétique, au transport de courant et au stockage d'énergie à 77 K." Phd thesis, Université de Grenoble, 2009. http://tel.archives-ouvertes.fr/tel-00616678.

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Une série de résultats fructueux ont été obtenus au cours de notre étude sur la fabrication de supraconducteur YBCO monodomaine à partir d'un procédé par fusion de poudre (PMP). Primo, grâce à une balance de Faraday à haute température, nous avons révélé les transitions de phase dynamiques pendant la croissance de monodomaine YBCO par le procédé PMP, ce qui est un travail de recherche original dans ce domaine. Ces résultats sur les transitions de phase ont contribué à une meilleure compréhension de la fabrication des monodomaine PMP-YBCO. Secundo, nous avons étudié la dynamique de croissance d

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18

SANFILIPPO, STEPHANE. "Effets des plans de macles sur les propriétés physiques du supraconducteur YBa2Cu3O(7-(delta) : étude sur des échantillons massifs texturés monodomaines." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10300.

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Par quatre methodes de mesures, mesures de courant critique de transport, mesures d'aimantation, mesures de resistivite, et mesures de diffusion de neutrons, un effet important des plans de macles (tb) sur les proprietes supraconductrices d'echantillons d'yba#2cu#3o#7#-#x textures monodomaines est mis en evidence. Les proprietes etudiees sont essentiellement celles le long de l'axe c, avec un champ b evoluant dans les plans ab et faisant un angle variable avec une direction de tb. A t = 77k, l'ancrage des vortex par les plans de macles se traduit pour b 1t par des pics de densite de courant cr

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19

Zemzemi, Nejib. "Étude théorique et numérique de l'activité électrique du cœur: Applications aux électrocardiogrammes." Phd thesis, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00470375.

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La modélisation du vivant, en particulier la modélisation de l'activité cardiaque, est devenue un déﬁ scientiﬁque majeur. Le but de cette thématique est de mieux comprendre les phénomènes physiologiques et donc d'apporter des solutions à des problèmes cliniques. Nous nous intéressons dans cette thèse à la modélisation et à l'étude numérique de l'activité électrique du cœur, en particulier l'étude des électrocardiogrammes (ECGs). L'onde électrique dans le cœur est gouvernée par un système d'équations de réaction-diﬀusion appelé modèle bidomaine ce système est couplé à une EDO représentant l'act

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20

Guidetti, Giulia. "Cellulose photonics : designing functionality and optical appearance of natural materials." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277918.

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Cellulose is the most abundant biopolymer on Earth as it is found in every plant cell wall; therefore, it represents one of the most promising natural resources for the fabrication of sustainable materials. In plants, cellulose is mainly used for structural integrity, however, some species organise cellulose in helicoidal nano-architectures generating strong iridescent colours. Recent research has shown that cellulose nanocrystals, CNCs, isolated from natural fibres, can spontaneously self-assemble into architectures that resemble the one producing colouration in plants. Therefore, CNCs are an

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21

Chin-HsunLu and 呂金勳. "GPU Acceleration on the Cardiac Monodomain Simulations." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/89hdtw.

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22

Luo, Chun-Yun, and 羅鈞云. "Pseudospectral Methods for Monodomain Electrocardiac Wave Equations." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/04177079425822730732.

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碩士<br>國立成功大學<br>數學系應用數學碩博士班<br>93<br>In this thesis a general framework of constructing multidimensional pseudospectral schemes for simulating action potential wave propagating on excitable membranes. Issues related to the wellposeness of the problems and to the stability of the schemes are emphasized especially. Our approach starts from the analyzing such wave problems and wellposed boundary operators are identified. We then employ pseudospectral penalty formulations to construct computational schemes for　solving problems such as traveling solutions of a nerve impulse propagating on axon fibe

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23

Chia-HaoHo and 何家豪. "Discontinuous Galerkin Methods for Monodomain Electrocardiac Wave Equations." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/40740265245786425969.

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碩士<br>國立成功大學<br>數學系應用數學碩博士班<br>100<br>In this thesis we construct a one-dimensional scheme to simulate the electrocardiac wave propagating in excitable ventricular cells. The monodomain electrocardiac wave equation is a reaction-diffusion equation whose reaction term consists of six ordinary differential equations and those equations are discretized in space into a set of semi-discrete equations by the discontinuous Galerkin method. The resulting ordinary differential equations system can be solved using time-integration methods. Due to the nature of the problem, we consider the implicit-expli

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24

OLAH, GLENN ALLEN. "MONODOMAIN SMECTIC LIQUID CRYSTALS OF MEMBRANE LIPID WITH MODEL ION CHANNELS." Thesis, 1987. http://hdl.handle.net/1911/13248.

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Phosphatidylcholine multilayers containing $\sim$24% water by total sample weight and gramicidin/lipid molar ratios, were aligned by a mechanical stressing and low temperature annealing ($$80$\mu$ thick x 40mm$\sp2$ area) monodomain defect-free multilayers containing as many as 10$\sp{17}$ uniformly oriented gramicidin channels to be prepared. The alignment of the lipid multilayers was monitored by observing conoscopic interference patterns and orthoscopic images. The smectic defects which appeared during the alignment process were identified and dissolved. The incorporation of gramicidin in t

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25

Choi, Jinsub [Verfasser]. "Fabrication of monodomain porous alumina using nanoimprint lithography and its applications / von Jinsub Choi." 2004. http://d-nb.info/970954050/34.

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26

Kim, Jongmyeong. "A Discrete Monolayer Cardiac Tissue Model for Tissue Preparation Specific Modeling." Diss., 2010. http://hdl.handle.net/10161/2369.

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<p>Engineered monolayers created by using microabrasion and micropatterning methods have provided a simplified in vitro system to study the effects of anisotropy and fiber direction on electrical propagation. Interpreting the behavior in these culture systems has often been performed using classical computer models with continuous properties. Such models, however, do not account for the effects of random cell shapes, cell orientations and cleft spaces inherent in these monolayers on the resulting wavefront conduction. Additionally when the continuous computer model is built to study impulse pr

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27

Boudreau, David Michael. "Shear induced orientation in nematic liquid crystal monodomains." 2001. https://scholarworks.umass.edu/dissertations/AAI3027181.

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The flow behavior and orientational order of nematic liquid crystal monodomains in shear flow were studied using the optical interference technique of conoscopy. Planar monodomains of two small molecule liquid crystals (n-( p-methoxybenzylidine)-p-butyl aniline (MBBA), and n-pentyl-cyano-biphenylene (5CB)) were prepared at various orientations to the flow direction. Shear and relaxation of molecular orientation was observed at constant temperature with various shear rates. The transient splay and twist director alignment was found to be dependent upon initial alignment conditions. The steady s

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