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Dissertations / Theses on the topic 'Fisher's equation'

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Published: 2 June 2025

Last updated: 31 July 2025

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1

Snguanyat, Ongorn. "Stochastic modelling of financial time series with memory and multifractal scaling." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/30240/1/Ongorn_Snguanyat_Thesis.pdf.

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Financial processes may possess long memory and their probability densities may display heavy tails. Many models have been developed to deal with this tail behaviour, which reflects the jumps in the sample paths. On the other hand, the presence of long memory, which contradicts the efficient market hypothesis, is still an issue for further debates. These difficulties present challenges with the problems of memory detection and modelling the co-presence of long memory and heavy tails. This PhD project aims to respond to these challenges. The first part aims to detect memory in a large number of

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2

Snguanyat, Ongorn. "Stochastic modelling of financial time series with memory and multifractal scaling." Queensland University of Technology, 2009. http://eprints.qut.edu.au/30240/.

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Financial processes may possess long memory and their probability densities may display heavy tails. Many models have been developed to deal with this tail behaviour, which reflects the jumps in the sample paths. On the other hand, the presence of long memory, which contradicts the efficient market hypothesis, is still an issue for further debates. These difficulties present challenges with the problems of memory detection and modelling the co-presence of long memory and heavy tails. This PhD project aims to respond to these challenges. The first part aims to detect memory in a large number of

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3

Herbert, Geoffrey M. "Stability analysis of the Fisher and Landau-Ginzburg equations." Thesis, University of Warwick, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307124.

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4

SILVA, JÚNIOR José Luiz Santos da. "Discussão sobre tamanho de fragmento e efeitos de isolamento com uso da equação Fisher - Kolmogorov." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/17739.

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Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2016-08-24T17:57:59Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) dissertaçãosuper_final_(1).pdf: 1088878 bytes, checksum: f1d95f7419b99281751c7ea750e47cf8 (MD5)<br>Made available in DSpace on 2016-08-24T17:57:59Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) dissertaçãosuper_final_(1).pdf: 1088878 bytes, checksum: f1d95f7419b99281751c7ea750e47cf8 (MD5) Previous issue date: 2011-08-31<br>CAPES<br>Nesta dissertação é apresentad

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Tkachov, Pasha [Verfasser], and Oleksandr [Akademischer Betreuer] Kutovyi. "Front propagation in the non-local Fisher-KPP equation / Pasha Tkachov ; Betreuer: Oleksandr Kutovyi." Bielefeld : Universitätsbibliothek Bielefeld, 2017. http://d-nb.info/1135724598/34.

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6

Dabrowski, Yoann. "Free entropies, free Fisher information, free stochastic differential equations, with applications to Von Neumann algebras." Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST1015.

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Ce travail étend nos connaissances des entropies libres et des équations différentielles stochastiques (EDS) libres dans trois directions. Dans un premier temps, nous montrons que l'algèbre de von Neumann engendrée par au moins deux autoadjoints ayant une information de Fisher finie n'a pas la propriété $Gamma$ de Murray et von Neumann. C'est un analogue d'un résultat de Voiculescu pour l'entropie microcanonique libre. Dans un second temps, nous étudions des EDS libres à coefficients opérateurs non-bornés (autrement dit des sortes d' EDP stochastiques libres ). Nous montrons la stationnarité d

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7

Coulon, Chalmin Anne-Charline. "Fast propagation in reaction-diffusion equations with fractional diffusion." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2427/.

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Cette thèse est consacrée à l'étude du comportement en temps long, et plus précisément de phénomènes de propagation rapide, des équations de réaction-diffusion de type Kisher-KPP avec diffusion fractionnaire. Ces équations modélisent, par exemple, la propagation d'espèces biologiques. Sous certaines hypothèses, la population envahit le milieu et nous voulons comprendre à quelle vitesse cette invasion a lieu. Pour répondre à cette question, nous avons mis en place une nouvelle méthode et nous l'appliquons à différents modèles. Dans une première partie, nous étudions deux problèmes d'évolution c

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8

Schmitz, Lars [Verfasser], Alexander [Gutachter] Drewitz, and Peter [Gutachter] Mörters. "The front of the randomized Fisher-KPP equation and the parabolic Anderson model / Lars Schmitz ; Gutachter: Alexander Drewitz, Peter Mörters." Köln : Universitäts- und Stadtbibliothek Köln, 2021. http://d-nb.info/1235138755/34.

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9

Tran, Tat Dat. "Information Geometry and the Wright-Fisher model of Mathematical Population Genetics." Doctoral thesis, Universitätsbibliothek Leipzig, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-90508.

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My thesis addresses a systematic approach to stochastic models in population genetics; in particular, the Wright-Fisher models affected only by the random genetic drift. I used various mathematical methods such as Probability, PDE, and Geometry to answer an important question: \"How do genetic change factors (random genetic drift, selection, mutation, migration, random environment, etc.) affect the behavior of gene frequencies or genotype frequencies in generations?”. In a Hardy-Weinberg model, the Mendelian population model of a very large number of individuals without genetic change factors

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10

McPherson, Nicola J. "Mathematical models for the control of Argulus foliaceus in UK stillwater trout fisheries." Thesis, University of Stirling, 2013. http://hdl.handle.net/1893/18618.

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Species of Argulus are macro-, ecto-parasites known to infect a wide variety of fish, but in the UK mainly cause problems in rainbow (Oncorhynchus mykiss) and brown trout (Salmo trutta). Argulus foliaceus is estimated to have caused problems in over 25% of stillwater trout fisheries in the UK. While A. foliaceus does not usually cause high levels of mortality, the parasite affects fish welfare, and also makes fish harder to catch due to morbidity and reduced appetite. This can cause severe economic problems for the fishery, resulting in reduced angler attendance due to poor capture rates and t

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11

El-Hachem, Maud. "Mathematical models of biological invasion." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/232864/1/Maud_El-Hachem_Thesis.pdf.

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This thesis studies mathematical models of a population of cells invading the surrounding environment or another living population. A classical single-species model is reformulated using a moving boundary to track the position of the moving front of the invading population. The moving boundary is also used to separate two populations. Other models studied are coupled partial differential equations to describe the interaction of a population with another one. Different types of interaction are represented: the degradation of healthy skin by cancer and the growth of bone tissue on substrate.

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12

Peoples, Brandon Kevin. "Applying ecological models to positive interactions among lotic fishes: implications for population and community regulation at multiple spatial scales." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/73340.

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Positive biotic interactions such as mutualism, commensalism and facilitation are ubiquitous in nature, but historically have received considerably less research attention than negative interactions such as competition, predation and parasitism. The paucity of research on positive interactions is particularly evident in stream ecosystems and in vertebrate communities. Stream fishes clearly provide an ideal system for advancing research on positive interactions. Many minnows (Cyprinidae) of eastern North America engage in a potentially mutualistic reproductive interaction known as nest associat

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13

Lepoultier, Guilhem. "Transport numérique de quantités géométriques." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112202/document.

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Une part importante de l’activité en calcul scientifique et analyse numérique est consacrée aux problèmes de transport d’une quantité par un champ donné (ou lui-même calculé numériquement). Les questions de conservations étant essentielles dans ce domaine, on formule en général le problème de façon eulérienne sous la forme d’un bilan au niveau de chaque cellule élémentaire du maillage, et l’on gère l’évolution en suivant les valeurs moyennes dans ces cellules au cours du temps. Une autre approche consiste à suivre les caractéristiques du champ et à transporter les valeurs ponctuelles le long d

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14

Kim, Sok Won. "Essays on monetary economics and financial economics." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1770.

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15

Wang, Jian. "From local to global: Complex behavior of spatiotemporal systems with fluctuating delay times." Doctoral thesis, Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-133734.

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The aim of this thesis is to investigate the dynamical behaviors of spatially extended systems with fluctuating time delays. In recent years, the study of spatially extended systems and systems with fluctuating delays has experienced a fast growth. In ubiquitous natural and laboratory situations, understanding the action of time-delayed signals is a crucial for understanding the dynamical behavior of these systems. Frequently, the length of the delay is found to change with time. Spatially extended systems are widely studied in many fields, such as chemistry, ecology, and biology. Self-organiz

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16

Wang, Jian. "From local to global: Complex behavior of spatiotemporal systems with fluctuating delay times: From local to global: Complex behavior of spatiotemporal systemswith fluctuating delay times." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2013. https://monarch.qucosa.de/id/qucosa%3A20006.

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The aim of this thesis is to investigate the dynamical behaviors of spatially extended systems with fluctuating time delays. In recent years, the study of spatially extended systems and systems with fluctuating delays has experienced a fast growth. In ubiquitous natural and laboratory situations, understanding the action of time-delayed signals is a crucial for understanding the dynamical behavior of these systems. Frequently, the length of the delay is found to change with time. Spatially extended systems are widely studied in many fields, such as chemistry, ecology, and biology. Self-organiz

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17

Carrapatoso, Kléber. "Théorèmes asymptotiques pour les équations de Boltzmann et de Landau." Phd thesis, Université Paris Dauphine - Paris IX, 2013. http://tel.archives-ouvertes.fr/tel-00920455.

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Nous nous intéressons dans cette thèse à la théorie cinétique et aux systèmes de particules dans le cadre des équations de Boltzmann et Landau. Premièrement, nous étudions la dérivation des équations cinétiques comme des limites de champ moyen des systèmes de particules, en utilisant le concept de propagation du chaos. Plus précisément, nous étudions les probabilités chaotiques sur l'espace de phase de ces systèmes de particules : la sphère de Boltzmann, qui correspond à l'espace de phase d'un système de particules qui évolue conservant le moment et l'énergie ; et la sphère de Kac, corresponda

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18

Shieh, Shang-Yau, and 謝升耀. "Existence of traveling wavefronts for the discrete Fisher's type equation." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/62258991248131745050.

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碩士<br>國立臺灣師範大學<br>數學研究所<br>87<br>We study the infinite system of coupled nonlinear differential equations which is called the discrete Fisher's type equation. Under the assumption that the coupled constant is not strong enough, we obtain the existence of traveling wavefronts for this system.

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19

Wu, Hui-Ying Chuang, and 莊吳慧瑩. "Reaction-Diffusion Equations of the Kolmogorov-Fisher Type." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/51885654615744101188.

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碩士<br>國立臺灣大學<br>數學研究所<br>93<br>Wavefront solutions of scalar reaction-diffusion equations have been intensively studied for many years. There are two basic cases for the Kolmogorov-Fisher type equations, typified by a nonlinear term with simple zero root and a nonlinear term with higher order zero root. The paper is concerned with solutions u(x,t) of the equation u_t=u_{xx}+f(u), x is in (-infty, infty) in the case f(u)={e^{-1/u}}*(1-u), f(1)=0, f''(1)< 0 The approach is to use the monotonicity to take u and t as independent variables and p(u,t)=u_x(x,t) as the dependent variable, and t

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20

Bogdańska, Magdalena. "Mathematical models for the dynamics of low-grade gliomas and their response to therapies." Doctoral thesis, 2019. https://depotuw.ceon.pl/handle/item/3333.

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In this dissertation, mathematical models and methods were used to study the evolution and the response to treatments of low-grade gliomas. Low-grade gliomas are brain tumours usually growing slowly but causing death due to their progression to more malignant counterparts. We constructed macroscopic models of low-grade gliomas' growth in such a way that they were accurate enough to reflect available clinical observations and simple enough so that they could be analysed analytically. The models presented in this thesis were designed in the form of systems of either ordinary differential equati

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21

Chen, Ping, and 陳屏. "Comparison of fitting growth equations on fishes with different body shapes." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/12633689405861355017.

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碩士<br>國立臺灣海洋大學<br>海洋資源管理研究所<br>92<br>Abstract Fishes have various body shapes. The objective of this study was to examine whether the performances of growth equations were affected by different body shapes. This was differ from other studies fitting a single species with different growth equations. The four most commonly used growth equations in fisheries-von Bertalanffy, Logistic, Gompertz, and Richards were fitted to the growth data of 12 samples with different body shapes. The mean square error (MSE), the Akaike’s Information Criterion (AIC) , and the deviation of the estimated asymptotic

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22

Taylor, Geraldine C., Jaclyn Marie Hill, Michelle C. Jackson, Richard A. Peel та Olaf L. F. Weyl. "Estimating δ15N fractionation and adjusting the lipid correction equation using Southern African freshwater fishes". 2017. http://hdl.handle.net/10962/69124.

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Stable isotope analysis is an important tool for characterising food web structure; however, interpretation of isotope data can often be flawed. For instance, lipid normalisation and trophic fractionation values are often assumed to be constant, but can vary considerably between ecosystems, species and tissues. Here, previously determined lipid normalisation equations and trophic fractionation values were re-evaluated using freshwater fish species from three rivers in the Upper Zambezian floodplain ecoregion in southern Africa. The parameters commonly used in lipid normalisation equations were

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23

Goetz, Andrew Stewart. "The Einstein-Klein-Gordon Equations, Wave Dark Matter, and the Tully-Fisher Relation." Diss., 2015. http://hdl.handle.net/10161/9927.

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<p>We examine the Einstein equation coupled to the Klein-Gordon equation for a complex-valued scalar field. These two equations together are known as the Einstein-Klein-Gordon system. In the low-field, non-relativistic limit, the Einstein-Klein-Gordon system reduces to the Poisson-Schrödinger system. We describe the simplest solutions of these systems in spherical symmetry, the spherically symmetric static states, and some scaling properties they obey. We also describe some approximate analytic solutions for these states.</p><p>The EKG system underlies a theory of wave dark matter, also known

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24

Chang, Chiao-Hsiang, and 張喬翔. "Smooth Regime-Switching Fisher Equations: Empirical Evidence from Four Kinds of Assets in G7." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/ufhx6p.

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碩士<br>中原大學<br>國際貿易研究所<br>99<br>Abstract In 1930, Irving Fisher proposed that nominal interest rates comprise expected real interest rates and expected inflation rates. This proposition is the famous Fisher hypothesis. In other words, nominal interest rates will keep pace with expected inflation rates. Transposing the notion of Fisher hypothesis to other financial assets imply that the nominal returns of assets adjust on a one-to-one basis to inflation rates in a competitive market. While the Fisher hypothesis has been investigated in both theoretical and empirical economics, the models employe

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25

Wu, Hui-Yi, and 吳惠怡. "The Effect of Inflation Rate on Taiwan Stock Exchange Return Rate of Electronic and Financial Industries-An Empirical Study of Fisher Equation." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/46496841498697379096.

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碩士<br>國立臺灣大學<br>經濟學研究所<br>95<br>In the economic system movement process, the variation of price level are closely linked with the level of living and the money purchasing power, but the inflation rate plays a strong role. In the recent 20 years, electronic and financial industries mainly led the Taiwan’s economy development, therefore this article selects Taiwan stock exchange return rate of electronic and financial industries as the main research. In order to discuss which factor decides sotck return rates in the process of inflation, as well as to see the effects of monetary policy and t

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26

Suri, Ratneesh. "Optimal harvesting strategies for fisheries : a differential equations approach : a thesis presented in partial fulfillment of the requirement for the degree of Doctor of Philosophy in Mathematics at Massey University, Albany, New Zealand." 2008. http://hdl.handle.net/10179/765.

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The purpose of fisheries management is to achieve a sustainable development of the activity, so that future generations can also benefit from the resource. However, the optimal harvesting strategy usually maximizes an economically important objective function formed by the harvester which can lead to the extinction of the resource population. Therefore, sustainability has been far more difficult to achieve than is commonly thought; fish populations are becoming increasingly limited and catches are declining due to overexploitation. The aim of this research is to determine an optimal harvesting

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27

(7469945), Patricia A. Nease. "Nearshore habitat and land-use effects on trophic interactions and growth of largemouth bass and bluegill in Indiana's glacial lakes." Thesis, 2019.

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Glacial lakes, such as those in the Midwest region of the United States, are ecologically and economically important, and they provide a wide range of ecosystem services, such as habitat for wildlife and fishes, flood control and recreational boating. Glacial lakes often support locally important sport fisheries, such as largemouth bass <i>Micropterus salmoides</i> and bluegill <i>Lepomis macrochirus</i>,<i> </i>which are partially dependent on suitable habitat within lakes. Nearshore vegetation is often removed by lakeshore landowners for perceived aesthetics and boat access, or by area manag

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28

DiTanna, Anthony Santino. "The optimal control of a Lévy process." 2009. http://hdl.handle.net/2152/6652.

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In this thesis we study the optimal stochastic control problem of the drift of a Lévy process. We show that, for a broad class of Lévy processes, the partial integro-differential Hamilton-Jacobi-Bellman equation for the value function admits classical solutions and that control policies exist in feedback form. We then explore the class of Lévy processes that satisfy the requirements of the theorem, and find connections between the uniform integrability requirement and the notions of the score function and Fisher information from information theory. Finally we present three different numerical

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29

Batista, Fábio Sousa. "O impacto da evolução do índice de preços em Portugal e na Zona Euro no PSI 20." Master's thesis, 2017. http://hdl.handle.net/10071/15595.

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A seguinte dissertação pretende estudar a relação entre o índice de preços, em Portugal e na Zona Euro, e o mercado acionista português – o PSI 20. A partir dos pressupostos fisherianos até aos estudos empíricos da atualidade a relação entre as variáveis tem sido amplamente estudada, mas nem sempre com conclusões similares, variando tendo em conta principalmente o mercado e o espaço temporal. Com o objetivo de perceber como interagem estas variáveis no contexto português, entre janeiro de 1999 e dezembro de 2015, esta dissertação utiliza um modelo VAR para responder a várias perguntas à

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