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Rozprawy doktorskie na temat „Spiral wave”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 6 lutego 2022

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1

Rimal, Nischal. "Impact Localization Using Lamb Wave and Spiral FSAT." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1388672483.

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2

Caswell, Eric D. "Design and Analysis of Star Spiral with Application to Wideband Arrays with Variable Element Sizes." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/25963.

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This dissertation details the development of the star spiral antenna and demonstrates the advantages of the star spiral when used in a wideband array with variable element sizes. The wideband array with variable element sizes (WAVES) is a multi-octave array that uses different sized circular Archimedean spirals for each octave of frequency coverage. A two-octave WAVES array has been presented in the literature, but a gap in the two-octave frequency coverage exists along the principal axes. The star spiral antenna was developed to eliminate the performance gap in the WAVES array. The star sp

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3

Xu, Aoxiang 1969. "Computer simulation of reentrant spiral-wave activity in two-dimensional ventricular Myocardium." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27436.

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Acute myocardial ischemia is the main cause of ventricular tachycardia and ventricular fibrillation. Reentrant activity is the most common mechanism of these ventricular arrhythmias, and is often initiated from the border zone between the ischemic and normal tissue. Theoretical studies have suggested that spiral-wave activity may be one form of reentrant arrhythmia. Our study explores the possible relation between spiral-wave activity and ischemia-induced ventricular arrhythmias. We numerically simulate reentrant activity in a two-dimensional sheet of ventricular myocardium which contains an i

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4

Xu, Aoxiang. "Computer simulation of reentrant spiral-wave activity in two-dimensional ventricular myocardium." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29811.pdf.

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5

Boily, Patrick. "Spiral wave dynamics under full Euclidean symmetry-breaking: A dynamical system approach." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/29341.

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Spirals are common in Nature: the snail's shell and the ordering of seeds in the sunflower are amongst the most widely-known occurrences. While these are static, dynamic spirals can also be observed in excitable systems such as heart tissue, retina, certain chemical reactions, slime mold aggregates, flame fronts, etc. The images associated with these spirals are often breathtaking, but spirals have also been linked to cardiac arrhythmias, a potentially fatal heart ailment. In the literature, very specific models depending on the excitable system of interest are used to explain the observed beh

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6

Heinemann, Tobias. "The dynamics of spiral density waves in turbulent accretion discs." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608944.

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7

Bramburger, Jason. "On the Existence and Stability of Rotating Wave Solutions to Lattice Dynamical Systems." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36235.

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Rotating wave solutions to evolution equations have been shown to govern many important biological and chemical processes. Much of the rigorous mathematical investigations of rotating waves rely on the model exhibiting a continuous Euclidean symmetry, which is only present in an idealized situation. Here we investigate the existence of rotationally propagating solutions in a discrete spatial setting, in which typical symmetry methods cannot be applied, thus presenting an unique perspective on rotating waves. Our goal in this thesis is to demonstrate the existence and potential stability of rot

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8

Naknaimueang, Somprasong. "Control of spiral wave dynamics by feedback mechanism via a triangular sensory domain." [S.l.] : [s.n.], 2006. http://diglib.uni-magdeburg.de/Dissertationen/2006/somnaknaimueang.htm.

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9

Haghighattalab, Armin. "Finite Element Modeling of Spiral Frequency Steerable Acoustic Transducers (FSATs) for guided waves based Structural Health Monitoring of plate-like structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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Structural Health Monitoring (SHM) is an emerging area of research associated to improvement of maintainability and the safety of aerospace, civil and mechanical infrastructures by means of monitoring and damage detection. Guided wave structural testing method is an approach for health monitoring of plate-like structures using smart material piezoelectric transducers. Among many kinds of transducers, the ones that have beam steering feature can perform more accurate surface interrogation. A frequency steerable acoustic transducer (FSATs) is capable of beam steering by varying the input frequen

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10

Nakagawa, Harumichi. "Acute Amiodarone Slows Down the Spiral Rotation and Prevents the Wave-Break During Ventricular Tachycardia(RIEM Conference, Ⅱ, 2003)." Research Institute of Environmental Medicine, Nagoya University, 2003. http://hdl.handle.net/2237/7613.

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11

Schlesner, Jan [Verfasser], Harald [Akademischer Betreuer] Engel, and Lutz [Akademischer Betreuer] Schimansky-Geier. "Control of spiral wave dynamics in active media / Jan Schlesner. Gutachter: Harald Engel ; Lutz Schimansky-Geier. Betreuer: Harald Engel." Berlin : Technische Universität Berlin, 2015. http://d-nb.info/1067388796/34.

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12

Wu, Jun. "Development of full wave Green's functions for expeditious method of moments analysis of spiral antennas embedded in multi-layered dielectric cylinders." Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555241.

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Spiral antennas have a wide range of applications in communications because they are circularly polarized with broadband characteristics with respect to both input impedance and radiation pattern. However, a spiral antenna that is conformal to a multilayered cylindrical media has not been reported in earlier studies. This thesis presents in depth analysis of such antennas using a full wave Method of Moments model. There are two crucial issues involved in such model: developing efficient spatial domain Green's function expressions, and then linking the Green's functions with the Method of Momen

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13

Korzhova, Valentina N. "Tracking Fluid Flow in a Spinning Disk Reactor." Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/3813.

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The flow of a liquid film over a rapidly rotating horizontal disk has many applications inmedical, industrial, and engineering fields. A specific example is the heat and mass transfer processes between expanded liquid and surrounded dense gas. Diferent wave regimes of a liquid film depend on a flow conditions such as the properties of a liquid, its initial speed,parameters of environment, etc. Therefore, experimental investigation of the film flow over a spinning disk is needed to both validate theoretical predictions and establish methods for fluid flow monitoring.This thesis presents novel v

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14

Allexandre, Didier. "A Fast Numerical Method for Large-Scale Modeling of Cardiac Tissue and Linear Perturbation Theory for the Study and Control of Cardiac Spiral Wave Breakup." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1094046834.

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15

Foulkes, Andrew J. "Drift and meander of spiral waves." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507172.

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16

McKenzie, Andy. "Modelling spiral waves in Xenopus laevis oocyte." Thesis, University of Canterbury. Mathematics and Statistics, 1997. http://hdl.handle.net/10092/6954.

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An investigation was made into the spiral waves solutions for the Atri et al model, a partial differential equation model for Ca²⁺ dynamics in the Xenopus laevis oocyte. Spiral wave solutions, both stable and unstable, were found to exist in the oscillatory regime for this model. The spiral wave solutions were found to have a period that decreased as the initial IP₃ bolus increased. Increasing the initial IP₃ bolus also lead to destabilisation of the spiral waves solutions. After the break up of spiral wave solutions complex spatio-temporal patterns occurred. In some cases spirals reformed aft

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17

Charette, Laurent. "Lattice Symmetry Breaking Perturbation for Spiral Waves." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24292.

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Spiral waves occur in several natural phenomena, including reaction fronts in two-dimension excitable media. In this thesis we attempt to characterize the motion of the spiral tip of a rigidly rotating wave and a linearly travelling wave in the context of a lattice perturbation. This system can be reduced to its center manifold, which allows us to describe the system as ordinary differential equations. This in turn means dynamical systems methods are appropriate to describe the motion of the tip. It is in such a context that we work on spiral waves. We study perturbed rotating waves and travel

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18

Wheeler, Paul. "Linear stability computations of spiral and scroll waves." Thesis, University of Warwick, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443623.

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19

Comanici, Adela N. "Spiral waves on spherical domains: A dynamical systems approach." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29088.

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This thesis is concerned with the dynamics and bifurcations of spiral waves in excitable media with spherical or approximately spherical geometry (e.g. cardiac tissue). First, we study parameter-dependent systems of reaction-diffusion partial differential equations on a sphere which are equivariant under the group SO(3) of all rigid rotations on a sphere. Two main types of spatial-temporal patterns that can appear in such systems are rotating waves (equilibrium in a co-rotating frame) and modulated rotating waves (periodic solution in a co-rotating frame). The transition from rotating waves t

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20

Aguareles, Carrero Maria. "Interaction of spiral waves in the general complex Ginzburg-Landau equation." Doctoral thesis, Universitat Politècnica de Catalunya, 2007. http://hdl.handle.net/10803/5854.

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Molts sistemes físics tenen la propietat que la seva dinàmica ve definida per algun tipus de difussió espaial en competició amb un fenòmen de reacció, com per exemple en el cas de dos components químics que reaccionen al mateix temps que es difon l'un en el si de l'altre. La presència d'aquests dos fenòmens, la difusió i la reacció, sovint dóna lloc a patrons no homogenis de gran riquesa. Els models matemàtics que descriuen aquest tipus de comportament són normalment equacions en derivades parcials les solucions de les quals representen aquests patrons. <br/><br/>En aquesta tesi s'analitza l'e

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21

Tsoi, Man. "Persistence of planar spiral waves under domain truncation near the core." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1148486634.

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22

Dai, Jia-yuan [Verfasser]. "Spiral Waves in Circular and Spherical Geometries : The Ginzburg-Landau Paradigm / Jia-Yuan Dai." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1140487205/34.

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23

Cullen, Andrew Lincoln. "Learning from the third wave the continuing journey of one Presbyterian pastor and congregation /." Theological Research Exchange Network (TREN), 1995. http://www.tren.com.

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24

Moon, Yumin. "Dynamical Impacts of Rotating Convective Asymmetries on Tropical Cyclones." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/126.

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Although a tropical cyclone may conceptually be regarded as an axisymmetric vortex, there is substantial evidence that asymmetric dynamics play an important role. In this thesis, dynamical impacts of rotating convective asymmetries are examined in this thesis. Two types of rotating convective asymmetries are considered: rotating eyewall convective maximum which is located in the core region of the storm and spiral bands which are located outside the core. Both of them can be characterized as rotating asymmetric convective heat sources, and they are superimposed on a balanced, axisymmetric vort

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25

McVay, Martin. "Spirals, one dimensional waves and other nonhomogeneous attractors in a two dimensional coupled map lattice." Thesis, University of Warwick, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247686.

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26

Casoli, Fabienne. "Nuages moléculaires, formation d'étoiles et structure spirale." Paris 7, 1987. http://www.theses.fr/1987PA077099.

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Résultats d'observation millimétriques de **(12)CO et **(13)CO, utilisés comme traceurs des nuages moléculaires. Etude de leur structure en fonction de la présence d'une barre, de bras spiraux ou d'une interaction. Présentation de quelques cas plus ou moins actifs

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27

Parkin, Vincent Nicholas. "Structural bottle necks, the wage price spiral and financial influences : a study of price formation and inflation in Brazil." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238544.

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28

Spadotto, André Augusto. "Simulações de ondas reentrantes e fibrilação em tecido cardíaco, utilizando um novo modelo matemático." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-29032006-152336/.

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A fibrilação, atrial ou ventricular, é caracterizada por uma desorganização da atividade elétrica do músculo. O coração, que normalmente contrai-se globalmente, em uníssono e uniforme, durante a fibrilação contrai-se localmente em várias regiões, de modo descoordenado. Para estudar qualitativamente este fenômeno, é aqui proposto um novo modelo matemático, mais simples do que os demais existentes e que, principalmente, admite uma representação singela na forma de circuito elétrico equivalente. O modelo foi desenvolvido empiricamente, após estudo crítico dos modelos conhecidos, e após uma série

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29

Behrens, Anders. "Measurements in Idiopathic Normal Pressure Hydrocephalus : Computerized neuropsychological test battery and intracranial pulse waves." Doctoral thesis, Umeå universitet, Klinisk neurovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-96195.

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Idiopathic Normal Pressure Hydrocephalus (INPH) is a condition affecting gait, cognition and continence. Radiological examination reveals enlarged ventricles of the brain. A shunt that drains CSF from the ventricles to the abdomen often improves the symptoms. Much research on INPH has been focused on identifying tests that predict the outcome after shunt surgery. As part of this quest, there are attempts to find measurement methods of intracranial parameters that are valid, reliable, tolerable and safe for patients. Today's technologies for intracranial pressure (ICP) measurement are invasive,

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30

Gavrilenko, Veronika. "Characterization of winding insulation of electrical machines fed by voltage waves with high dV/dt." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST027.

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L’isolation des bobinages des moteurs alimentés par des convertisseurs statiques basés sur la modulation de largeur d'impulsion est soumise à des contraintes électriques provenant de la forme d'onde de la tension d'alimentation. Les phénomènes de nuisances électromagnétiques sur l’ensemble de la chaîne de conversion, les ondes réfléchies dans le câble d’alimentation, ainsi que la non adaptation des impédances du câble et de l’enroulement de la machine peuvent conduire à l’apparition de surtensions aux bornes de la machine suffisamment élevées pour dépasser la tension d’apparition des décharges

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31

Reynaud, Denis. "Dynamique du gaz interstellaire dans les galaxies spirales barrées : une étude en interférométrie millimétrique de NGC 1530." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10044.

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Les barres jouent probablement un role important dans l'evolution des galaxies. Le potentiel gravitationnel de la barre est capable de concentrer de grandes quantites de gaz interstellaire dans le voisinage du noyau, fournissant ainsi du combustible aux activites nucleaires eventuelles (formation explosive d'etoiles ou disque d'accretion de trou noir). Le gaz tombe vers le centre de la galaxie le long de deux chocs presque paralleles a la barre. Ces chocs sont riches en poussieres et en gaz moleculaire. L'interferometre millimetrique et le telescope de 30m de l'iram ont permis une etude precis

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32

Nilsson, Erik. "Waves of change : traditional religion among the Urak Lawoi, sea nomads of Ko Lanta, Thailand." Thesis, University of Gävle, Ämnesavdelningen för kultur- och religionsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-6359.

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<p>This essay is the result of a field study in Ko Lanta in Thailand, during October-December 2009. The purpose of the study was to document the traditional religion of Urak Lawoi and to analyze in what way their life and beliefs have changed during the last 20 years.</p><p>Urak Lawoi is the name of one of the sea nomadic ethnic groups who lives along the shores of Myanmar, Thailand and Malaysia. They are spread on many of the islands in the Andaman Sea archipelago and Ko Lanta is the main settlement. Ural Lawoi is regarded as the indigenous people of the island and they live there as a minori

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33

Jacq, Thierry. "Le survey radiomillimetrique de l'observatoire de bordeaux : le gaz moleculaire interstellaire dans le plan galactique entre l=38 et l=67.5, structure spirale, nuages moleculaires, comparaison entre hi et **(13)co. ch dans le nuage sombre lynds 134." Paris 6, 1987. http://www.theses.fr/1987PA066440.

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L'observation radiomillimetrique a 110. 2 ghz du plan galactique a permis d'identifier 181 nuages interstellaires dont certains parametres sont listes. Deux bras spiraux sont mis en evidence: celui de persee d'inclinaison 12**(o) et un bras mineur lie au gaz local et incline de 22**(o). Les donnees moleculaires sont correlees aux donnees hi obtenues a arecibo et les resultats de cette comparaison sont presentes. D'autre part le nuage sombre l 134 est observe a 9 cm en ch et l'abondance relative de ce radical en fonction de la position est determinee

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34

Al, Atassi Yomen Al Sayed Souleiman. "Photochromisme et génération de second harmonique par voie photoassistée en milieu polymère : spiropyranne - photomérocyanine." Cachan, Ecole normale supérieure, 1996. http://www.theses.fr/1996DENS0010.

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Certains polymères, dopés ou fonctionnalisés avec des groupements moléculaires convenablement choisis, ont la propriété de doubler la fréquence de faisceaux lasers (génération de second harmonique). Pour cela, il faut au préalable que l'échantillon sous forme d'un film mince, ait été orienté sous champ électrique. Le sujet de cette thèse consiste à étudier un nouveau procédé d'orientation des molécules, que nous appelons orientation photo assistée. Ce procédé qui a l'avantage d'opérer à température ambiante met en œuvre une irradiation en lumière visible et en présence d'un champ électrique. C

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35

Harris-Birtill, Rosemary. "Mitchell's mandalas : mapping David Mitchell's textual universe." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12255.

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This study uses the Tibetan mandala, a Buddhist meditation aid and sacred artform, as a secular critical model by which to analyse the complete fictions of author David Mitchell. Discussing his novels, short stories and libretti, this study maps the author's fictions as an interconnected world-system whose re-evaluation of secular belief in galvanising compassionate ethical action is revealed by a critical comparison with the mandala's methods of world-building. Using the mandala as an interpretive tool to critique the author's Buddhist influences, this thesis reads the mandala as a metaphysic

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36

Lin, Wun-Ruei, and 林玟瑞. "Study on the Spiral Wave Patterns." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/5xkmpp.

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碩士<br>靜宜大學<br>應用數學研究所<br>93<br>In the actual life , chemical reaction , and physiological system, the spiral wave is the very common phenomenon, such as whirlpool, B-Z reaction, heart physiology, etc. This thesis will discuss the meaning of the spiral wave and mechanism of production in the electrophysiology of heart. Finally, we study some famous realistic models and simplified or generic models of heart.

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37

Wan-TingHuang and 黃婉婷. "Wave propagation in spiral acoustic hyperlens and metamaterial." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/37753075846819746306.

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碩士<br>國立成功大學<br>製造資訊與系統研究所<br>102<br>The permittivity and permeability are the basic quantity of electromagnetics in physics. Although almost all of natural material properties are positive, however, negative material properties can be realized by using artificial structures. Thus, what so-called “Metamaterial” is that materials have properties don’t exist in nature. Acoustic metamaterials, as a counterpart to electromagnetic metamaterials, can be explored as well. The novel properties of acoustic metamaterial will develop many possibilities in wave propagation design. Resolution of conven

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38

Yang, Chih-hao, and 楊智皓. "Spiral Wave-Like Solution to the lambda-omega System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/85863136482968923927.

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碩士<br>國立中正大學<br>應用數學研究所<br>98<br>lambda-omega systems are oscillatory reaction-diffusion systems. Specifically, the reaction kinetics of such systems admit a stable limit cycle. In this paper, we investigate spiral wave-like solutions in the generic lambda-omega system on a one-dimensional unit interval with no-flux boundary condition.

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39

Hsiang-Hsu, Wang. "The Response of Galactic Gas Disks to A Spiral Density-wave Potential." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2407200622210600.

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40

Wang, Hsiang-Hsu, and 王祥旭. "The Response of Galactic Gas Disks to A Spiral Density-wave Potential." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/47058604616723109411.

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碩士<br>國立臺灣大學<br>物理研究所<br>94<br>We use the gasdynamics equations to investigate the response of gas disks to a spiral density-wave potential. All simulations are performed on the Cartesian coordinate version of the Antares codes which we recently developed by using finite volume scheme and Godunov''s method. Two versions of codes are used, one incorporates self-gravity of the gas disk and the other one doesn''t. Logarithmic spiral potentials are adopted for all simulations. The results show the distinct difference between waves generated by resonance excited and the forced oscillation. To avoi

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41

Chuang, Chiao-Wen, and 莊喬文. "An Implementation and Verification of Matter Wave Extraction System with Spiral Antenna." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/96gf6e.

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碩士<br>國立中興大學<br>資訊科學與工程學系<br>106<br>Matter and energy in the natural environment have been constantly being discussed. From the discussion of modern physics, material can only be a form of energy. All things in the world are formed by energy and exist at the same time. The energy will have the so-called energy wave. In this paper, in order to confirm the existence of material energy, this matter wave extraction system will be implemented. By using spiral antennas to extract the energy signal in the material, the energy signal is amplified by the power amplification circuit and then amplified b

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42

"Mathematical modeling of spiral wave reentry and defibrillation shocks in ventricular myocardium." Tulane University, 1998.

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The mechanisms of cardiac defibrillation, the most effective clinical procedure for termination of lethal cardiac arrhythmias, are not well understood. Shocks establish an electric field in the heart, which, in turn, induces changes in the transmembrane potential leading to defibrillation. The complexity of cardiac structure makes it difficult to explain, based on experiments alone, how exactly the electric field affects transmembrane potential. In an attempt to provide additional insight into the issue, in this computational study we explore the effects of strong electric shocks on myocardium

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43

Nayak, Alok Ranjan. "Spiral-Wave Dynamics in Ionically Realistic Mathematical Models for Human Ventricular Tissue." Thesis, 2013. http://etd.iisc.ernet.in/2005/3423.

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There is a growing consensus that life-threatening cardiac arrhythmias like ven- tricular tachycardia (VT) or ventricular ﬁbrillation (VF) arise because of the formation of spiral waves of electrical activation in cardiac tissue; unbroken spiral waves are associated with VT and broken ones with VF. Several experimental studies have shown that in homogeneities in cardiac tissue can have dramatic effects on such spiral waves. In this thesis we focus on spiral-wave dynamics in mathematical models of human ventricular tissue which contain (a) conduction in homogeneities, (b) ionic in- homogeneitie

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Majumder, Rupamanjari. "Spiral- And Scroll- Wave Dynamics In Ironically And Anatomically Realistic Mathematical Models For Mammalian Ventricular Tissue." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2626.

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Cardiac arrhythmias, such as ventricular tachycardia (VT) and ventricular fibrillation (VF), are among the leading causes of death in the industrialized world. There is growing consensus that these arrhythmias are associated with the formation of spiral and scroll waves of electrical activation in mammalian cardiac tissue; whereas single spiral and scroll waves are believed to be associated with VT, their turbulent analogs are associated with VF. Thus, the study of these waves is an important biophysical problem in-so-far-as to develop an understanding of the electrophysiological basis of VT a

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Wang, Ren-Heng, and 王仁亨. "Fabrication and Analysis of Milimeter/Submilimeter Wave Broadband Spiral Antenna Excited by Ultrashort Pulsed Laser." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/87104659131730181900.

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Naknaimueang, Somprasong [Verfasser]. "Control of spiral wave dynamics by feedback mechanism via a triangular sensory domain / von Somprasong Naknaimueang." 2006. http://d-nb.info/982727712/34.

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Berg, Sebastian Stephan. "Characterization and Control of Wave Propagation in the Heart." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E607-5.

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Yang, Tsz-Yi, and 楊子宜. "The Study on Circular Dichroism of THz Wave Generated by Exciting 2-Arm Equiangular Spiral Antenna with Ultrashort Pulsed Laser." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/30804383730719685098.

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Kachui, Solingyur Zimik. "Dynamics of Spiral and Scroll Waves in a Mathematical Model for Human-Ventricular Tissue : The Effects of Fibroblasts, Early-after depolarization, and Heterogeneities." Thesis, 2017. http://etd.iisc.ernet.in/2005/3798.

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This thesis is devoted to the study of the dynamics of spiral and scroll waves in a mathematical model for cardiac tissue. We study the effects of the presence of heterogeneities on electrical-wave dynamics. The heterogeneities in the medium occur because of the variation in the electrophysiological properties of the constituent myocytes in the tissue, or because of the presence of cells like fibroblasts and pathological myocytes that can trigger early afterdepolarizations (EADs). We study how these heterogeneities can lead to the formation of spiral and scroll waves and how they can affect th

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Shajahan, T. K. "Studies Of Spiral Turbulence And Its Control In Models Of Cardiac Tissue." Thesis, 2008. http://hdl.handle.net/2005/759.

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There is a growing consensus that life-threatening cardiac arrhythmias like ventricular tachycardia (VT) or ventricular fibrillation (VF) arise because of the formation of spiral waves of electrical activation in cardiac tissue; unbroken spiral waves are associated with VT and broken ones with VF. Several experimental studies have shown that inhomogeneities in cardiac tissue can have dramatic effects on such spiral waves. In this thesis we try to understand these experimental results by carrying out detailed and systematic studies of the interaction of spiral waves with different types of inho

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