Дисертації з теми "Population Growth Model"
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Håkansson, Nina. "Population growth : analysis of an age structure population model." Thesis, Linköping University, Department of Mathematics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4392.
Повний текст джерелаThis report presents an analysis of a partial differential equation, resulting from population model with age structure. The existence and uniqueness of a solution to the equation are proved. We look at stability of the solution. The asymptotic behaviour of the solution is treated. The report also contains a section about the connection between the solution to the age structure population model and a simple model without age structure.
Tavos, Farid. "How elderly population effects economic growth." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-40834.
Повний текст джерелаLe, Roux Johan. "Industrial robot population density and the neoclassical growth model." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/59851.
Повний текст джерелаMini Dissertation (MBA)--University of Pretoria, 2017.
pa2017
Gordon Institute of Business Science (GIBS)
MBA
Unrestricted
Pignotti, Elettra <1958>. "Parameter estimation in a growth model for a biological population." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5169/2/Pignotti_Elettra_tesi.pdf.
Повний текст джерелаPignotti, Elettra <1958>. "Parameter estimation in a growth model for a biological population." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5169/.
Повний текст джерелаSmith, Garrett Paul. "Immunocontraceptive vaccines against brucellosis and population growth in feral swine." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/77987.
Повний текст джерелаPh. D.
Kuhle, Wolfgang. "The optimum growth rate for population in the neoclassical overlapping generations model." Frankfurt, M. Berlin Bern Bruxelles New York, NY Oxford Wien Lang, 2006. http://d-nb.info/985753951/04.
Повний текст джерелаGrafeneder-Weissteiner, Theresa, and Klaus Prettner. "Agglomeration and population aging in a two region model of exogenous growth." Inst. für Volkswirtschaftstheorie und -politik, WU Vienna University of Economics and Business, 2009. http://epub.wu.ac.at/1670/1/document.pdf.
Повний текст джерелаSeries: Department of Economics Working Paper Series
Urbanová, Kateřina. "Simulační model populačního vývoje." Master's thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-12083.
Повний текст джерелаO'Neill, Deborah M. "Estimating Black Bear Population Size, Growth Rate, and Minimum Viable Population Using Bait Station Surveys and Mark-Recapture Methods." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34140.
Повний текст джерелаMaster of Science
Gil, de Weir Karine. "Whooping crane (Grus americana) demography and environmental factors in a population growth simulation model." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3778.
Повний текст джерелаGruescu, Sandra. "Population ageing and economic growth : education policy and family policy in a model of endogenous growth ; with 32 tables /." Heidelberg ; New York : Physica-Verl, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2846158&prov=M&dok_var=1&dok_ext=htm.
Повний текст джерелаGruescu, Sandra. "Population ageing and economic growth : education policy and family policy in a model of endogenous growth; with 32 tab. /." Heidelberg : Physica-Verl, 2007. http://swbplus.bsz-bw.de/bsz256686149cov.htm.
Повний текст джерелаZhao, Suwen. "Simulating urban growth for Baltimore-Washington metropolitan area by coupling SLEUTH model and population projection." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/73649.
Повний текст джерелаMaster of Science
Wang, Yan. "Persistence and Extinction Dynamics in Reaction-Diffusion-Advection Stream Population Model with Allee Effect Growth." W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1563899009.
Повний текст джерелаLi, Chunmo. "The effects of local economic and environmental policies on county population and employment growth." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1135273183.
Повний текст джерелаMcChesney, Ronald John. "A Three Scale Metropolitan Change Model." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1209393707.
Повний текст джерелаGruescu, Sandra [Verfasser]. "Population ageing and economic growth : education policy and family policy in a model of endogenous growth ; with 32 tables / Sandra Gruescu." Heidelberg : Physica-Verl, 2007. http://d-nb.info/98539871X/34.
Повний текст джерелаJones, Darren Reed. "The Two Sides of Posttraumatic Growth: A Study of the Janus Face Model In a College Population." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1278526766.
Повний текст джерелаKärrman, Victoria. "The effects of the Swedish moosemanagement." Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-77069.
Повний текст джерелаFazal, Fatema. "The urban development in Dubai : A descriptive analysis." Thesis, Uppsala University, Department of Economics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88550.
Повний текст джерела
The aim of this paper is to analyse the urban development in Dubai by means of the fourquadrant model, presented by DiPasquale and Wheaton, which represents the market for real estate use and assets. The focus is on factors such as economic growth, access to oil, population growth and the incentive of the government to promote developments in Dubai, to study how they affect the real estate market. It is observed how all these factors contribute to the expansion of the construction sector and thereby the stock of space. However, because Dubai's economy is independent of the oil sector, access to oil is solely assumed to contribute to a higher amount of disposable capital and therefore does not have any upward pressure on the rent and the price level as the remaining factors.
Kielbassa, Janice. "Mathematical modelling of temperature effects on the life-history traits and the population dynamics of bullhead (Cottus gobio)." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10181.
Повний текст джерелаWater temperature plays a key role in the life cycle of fish. Therefore, increasing temperatures due to the expected climate change may have a strong impact on growth, fecundity and survival. The goal of this thesis is to model the impact of temperature on the life-history traits of a bullhead population (Cottus gobio) in order to make predictions both at individual and at population level. The models developed here are calibrated on experimental field data from a population living in the Bez River network (Drôme, France). First, a new back-calculation model is derived that can be used to compute individual fish body lengths at earlier ages from capture data. Next, a growth model is proposed that incorporates the water temperature and can be used to predict the mean length at a given age and temperature. Finally, the population is modelled as a whole by linking all life-history traits to temperature. For this purpose, a spatialised time- and temperature-dependent Leslie matrix model structured in age classes was used to predict the population dynamics under different temperature scenarios
Johansson, Rikard. "Model-Based Hypothesis Testing in Biomedicine : How Systems Biology Can Drive the Growth of Scientific Knowledge." Doctoral thesis, Linköpings universitet, Avdelningen för medicinsk teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-141614.
Повний текст джерелаAnvändandet av matematiska verktyg har inom biologi och medicin traditionellt sett varit mindre utbredd jämfört med andra ämnen inom naturvetenskapen, såsom fysik och kemi. Ett ökat behov av verktyg som databehandling, bioinformatik, statistik och matematisk modellering har trätt fram tack vare framsteg under de senaste decennierna. Dessa framsteg är delvis ett resultat av utvecklingen av storskaliga datainsamlingstekniker. Inom alla områden av biologi och medicin så har dessa data avslöjat en hög nivå av interkonnektivitet mellan komponenter, verksamma på många kontrollnivåer och med flera återkopplingar både mellan och inom varje nivå av kontroll. Tillgång till storskaliga data är emellertid inte synonymt med en detaljerad mekanistisk förståelse för det underliggande systemet. Snarare uppnås en mekanisk förståelse först när vi bygger en hypotes vars prediktioner vi kan testa experimentellt. Att identifiera intressanta prediktioner som är av kvantitativ natur, kräver generellt sett matematisk modellering. Detta kräver i sin tur att det studerade systemet kan formuleras till en matematisk modell, såsom en serie ordinära differentialekvationer, där olika hypoteser kan uttryckas som precisa matematiska uttryck som påverkar modellens output. Inom vissa delområden av biologin har utnyttjandet av matematiska modeller haft en lång tradition, såsom den modellering gjord inom elektrofysiologi av Hodgkin och Huxley på 1950‑talet. Det är emellertid just på senare år, med ankomsten av fältet systembiologi, som matematisk modellering har blivit ett vanligt inslag. Den något långsamma adapteringen av matematisk modellering inom biologi är bl.a. grundad i historiska skillnader i träning och terminologi, samt brist på medvetenhet om exempel som illustrerar hur modellering kan göra skillnad och faktiskt ofta är ett krav för en korrekt analys av experimentella data. I detta arbete tillhandahåller jag sådana exempel och demonstrerar den matematiska modelleringens och hypotestestningens allmängiltighet och tillämpbarhet i tre olika biologiska system. I Arbete II visar vi hur matematisk modellering är nödvändig för en korrekt tolkning och analys av dominant-negativ-inhiberingsdata vid insulinsignalering i primära humana adipocyter. I Arbete III använder vi modellering för att bestämma transporthastigheter över cellkärnmembranet i jästceller, och vi visar hur denna teknik är överlägsen traditionella kurvpassningsmetoder. Vi demonstrerar också frågan om populationsheterogenitet och behovet av att ta hänsyn till individuella skillnader mellan celler och befolkningen som helhet. I Arbete IV använder vi matematisk modellering för att förkasta tre hypoteser om hur fenomenet facilitering uppstår i pyramidala nervceller hos råttor och möss. Vi visar också hur en överlevande hypotes kan beskriva all data, inklusive oberoende valideringsdata. Slutligen utvecklar vi i Arbete I en metod för modellselektion och modelldiskriminering med hjälp av parametrisk ”bootstrapping” samt kombinationen av olika empiriska fördelningar av traditionella statistiska tester. Vi visar hur det empiriska ”log-likelihood-ratio-testet” är den bästa kombinationen av två tester och hur testet är applicerbart, inte bara för modellselektion, utan också för modelldiskriminering. Sammanfattningsvis är matematisk modellering ett värdefullt verktyg för att analysera data och testa biologiska hypoteser, oavsett underliggande biologiskt system. Vidare utveckling av modelleringsmetoder och tillämpningar är därför viktigt eftersom dessa sannolikt kommer att spela en avgörande roll i framtiden för biologi och medicin, särskilt när det gäller att hantera belastningen från ökande datamängder som blir tillgänglig med nya experimentella tekniker.
Stevenson, Christopher Eric, and Chris Stevenson@aihw gov au. "A microsimulation study of the benefits and costs of screening for colorectal cancer." The Australian National University. National Centre for Epidemiology and Population Health, 2001. http://thesis.anu.edu.au./public/adt-ANU20040611.162207.
Повний текст джерелаLi, Wenjuan. "Firms and people in place : driving forces for regional growth." Doctoral thesis, Umeå : Department of Social and Economic Geography, Umeå University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1360.
Повний текст джерелаJönsson, Ingela, and Mattias Nilsson. "Klassiska populationsmodeller kontra stokastiska : En simuleringsstudie ur matematiskt och datalogiskt perspektiv." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-2262.
Повний текст джерелаI detta tvärvetenskapliga arbete studeras från den matematiska sidan tre klassiska populationsmodeller: Malthus tillväxtmodell, Verhulsts logistiska modell och Lotka-Volterras jägarebytesmodell. De klassiska modellerna jämförs med stokastiska. De stokastiska modeller som studeras är födelsedödsprocesser och deras diffusionsapproximation. Jämförelse görs med medelvärdesbildade simuleringar.
Det krävs många simuleringar för att kunna genomföra jämförelserna. Dessa simuleringar måste utföras i datormiljö och det är här den datalogiska aspekten av arbetet kommer in. Modellerna och deras resultathantering har implementerats i både MatLab och i C, för att kunna möjliggöra en undersökning om skillnaderna i tidsåtgången mellan de båda språken, under genomförandet av ovan nämnda jämförelser. Försök till tidsoptimering utförs och även användarvänligheten under implementeringen av de matematiska problemen i de båda språken behandlas.
Följande matematiska slutsatser har dragits, att de medelvärdesbildade lösningarna inte alltid sammanfaller med de klassiska modellerna när de simuleras på stora tidsintervall. I den logistiska modellen samt i Lotka-Volterras modell dör förr eller senare de stokastiska simuleringarna ut när tiden går mot oändligheten, medan deras deterministiska representation lever vidare. I den exponentiella modellen sammanfaller medelvärdet av de stokastiska simuleringarna med den deterministiska lösningen, dock blir spridningen stor för de stokastiska simuleringarna när de utförs på stora tidsintervall.
Datalogiska slutsatser som har dragits är att när det kommer till att implementera få modeller, samt resultatbearbetning av dessa, som ska användas upprepade gånger, är C det bäst lämpade språket då det visat sig vara betydligt snabbare under exekvering än vad MatLab är. Dock måste hänsyn tas till alla de svårigheter som implementeringen i C drar med sig. Dessa svårigheter kan till stor del undvikas om implementeringen istället sker i MatLab, då det därmed finns tillgång till en uppsjö av väl lämpade funktioner och färdiga matematiska lösningar.
In this interdisciplinary study, three classic population models will be studied from a mathematical view: Malthus’ growth, Verhulst’s logistic model and Lotka-Volterra’s model for hunter and prey. The classic models are being compared to the stochastic ones. The stochastic models studied are the birthdeath processes and their diffusion approximation. Comparisons are made by averaging simulations.
It requires numerous simulations to carry out the comparisons. The simulations must be carried out on a computer and this is where the computer science emerges to the project. The models, along with the handling of the results, have been implemented in both Mat- Lab and in C in order to allow a comparison between the two languages whilst executing the above mentioned study. Attempts to time optimization and an evaluation concerning the user-friendliness regarding the implementation of mathematical problems will be performed.
Mathematic conclusions, which have been drawn, are that the averaging solutions do not always coincide with the traditional models when they are being simulated over large time. In the logistic model and in Lotka-Volterra’s model the stochastic simulations will sooner or later die when the time is moving towards infinity, whilst their deterministic representation keeps on living. In the exponential model, the mean values of the stochastic simulations and of the deterministic solution coincide. There is, however, a large spread for the stochastic simulations when they are carried out over a large time.
Computer scientific conclusions drawn from the study includes that when it comes to implementing a few models, along with the handling of the results, to be used repeatedly, C is the most appropriate language as it proved to be significantly faster during execution. However, all of the difficulties during the implementation of mathematical problems in C must be kept in mind. These difficulties can be avoided if the implementation instead takes place in MatLab, where a numerous of mathematical functions and solutions will be available.
Nilsson, Mattias, and Ingela Jönsson. "Klassiska populationsmodeller kontra stokastiska : En simuleringsstudie ur matematiskt och datalogiskt perspektiv." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-2263.
Повний текст джерелаI detta tvärvetenskapliga arbete studeras från den matematiska sidan tre klassiska populationsmodeller: Malthus tillväxtmodell, Verhulsts logistiska modell och Lotka-Volterras jägarebytesmodell. De klassiska modellerna jämförs med stokastiska. De stokastiska modeller som studeras är födelsedödsprocesser och deras diffusionsapproximation. Jämförelse görs med medelvärdesbildade simuleringar.
Det krävs många simuleringar för att kunna genomföra jämförelserna. Dessa simuleringar måste utföras i datormiljö och det är här den datalogiska aspekten av arbetet kommer in. Modellerna och deras resultathantering har implementerats i både MatLab och i C, för att kunna möjliggöra en undersökning om skillnaderna i tidsåtgången mellan de båda språken, under genomförandet av ovan nämnda jämförelser. Försök till tidsoptimering utförs och även användarvänligheten under implementeringen av de matematiska problemen i de båda språken behandlas.
Följande matematiska slutsatser har dragits, att de medelvärdesbildade lösningarna inte alltid sammanfaller med de klassiska modellerna när de simuleras på stora tidsintervall. I den logistiska modellen samt i Lotka-Volterras modell dör förr eller senare de stokastiska simuleringarna ut när tiden går mot oändligheten, medan deras deterministiska representation lever vidare. I den exponentiella modellen sammanfaller medelvärdet av de stokastiska simuleringarna med den deterministiska lösningen, dock blir spridningen stor för de stokastiska simuleringarna när de utförs på stora tidsintervall.
Datalogiska slutsatser som har dragits är att när det kommer till att implementera få modeller, samt resultatbearbetning av dessa, som ska användas upprepade gånger, är C det bäst lämpade språket då det visat sig vara betydligt snabbare under exekvering än vad MatLab är. Dock måste hänsyn tas till alla de svårigheter som implementeringen i C drar med sig. Dessa svårigheter kan till stor del undvikas om implementeringen istället sker i MatLab, då det därmed finns tillgång till en uppsjö av väl lämpade funktioner och färdiga matematiska lösningar.
In this interdisciplinary study, three classic population models will be studied from a mathematical view: Malthus’ growth, Verhulst’s logistic model and Lotka-Volterra’s model for hunter and prey. The classic models are being compared to the stochastic ones. The stochastic models studied are the birthdeath processes and their diffusion approximation. Comparisons are made by averaging simulations.
It requires numerous simulations to carry out the comparisons. The simulations must be carried out on a computer and this is where the computer science emerges to the project. The models, along with the handling of the results, have been implemented in both MatLab and in C in order to allow a comparison between the two languages whilst executing the above mentioned study. Attempts to time optimization and an evaluation concerning the user-friendliness regarding the implementation of mathematical problems will be performed.
Mathematic conclusions, which have been drawn, are that the averaging solutions do not always coincide with the traditional models when they are being simulated over large time. In the logistic model and in Lotka-Volterra’s model the stochastic simulations will sooner or later die when the time is moving towards infinity, whilst their deterministic representation keeps on living. In the exponential model, the mean values of the stochastic simulations and of the deterministic solution coincide. There is, however, a large spread for the stochastic simulations when they are carried out over a large time.
Computer scientific conclusions drawn from the study includes that when it comes to implementing a few models, along with the handling of the results, to be used repeatedly, C is the most appropriate language as it proved to be significantly faster during execution. However, all of the difficulties during the implementation of mathematical problems in C must be kept in mind. These difficulties can be avoided if the implementation instead takes place in MatLab, where a numerous of mathematical functions and solutions will be available.
Picart, Delphine. "Modélisation et estimation des paramètres liés au succès reproducteur d'un ravageur de la vigne (Lobesia botrana DEN. & SCHIFF.)." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2009. http://tel.archives-ouvertes.fr/tel-00405686.
Повний текст джерелаTomášková, Markéta. "Přelidnění - globální demografický problém." Master's thesis, Vysoká škola ekonomická v Praze, 2015. http://www.nusl.cz/ntk/nusl-205991.
Повний текст джерелаHounslow, Michael John. "A discretized population balance for simultaneous nucleation, growth and aggregation /." Title page, summary and table of contents only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phh839.pdf.
Повний текст джерелаHenrique, de Santana Luís. "Growth models incorporating technology and a new population dynamics equation." Universidade Federal de Pernambuco, 2006. https://repositorio.ufpe.br/handle/123456789/5770.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Henrique de Santana, Luís; Menezes Campello de Souza, Fernando. Growth models incorporating technology and a new population dynamics equation. 2006. Dissertação (Mestrado). Programa de Pós-Graduação em Engenharia de Produção, Universidade Federal de Pernambuco, Recife, 2006.
Wasson, Samantha Rae. "Increasing Introductory Biology Students' Modeling Mastery Through Visualizing Population Growth Models." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9181.
Повний текст джерелаRamula, Satu. "Population viability analysis for plants : practical recommendations and applications." Doctoral thesis, Stockholm : Department of Botany, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-845.
Повний текст джерелаWiff, Rodrigo. "Predicting food consumption and production in fish populations : allometric scaling and size-structured models." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/935.
Повний текст джерелаBenedito, Antone dos Santos. "Multi-stage population models applied to insect dynamics." Botucatu, 2020. http://hdl.handle.net/11449/192335.
Повний текст джерелаAbstract: This thesis presents two manuscripts previously sent to publication in scientific journals. In the first manuscript, a delay differential equation model is developed to study the dynamics of two Aedes aegypti mosquito populations: infected by the intracellular bacteria Wolbachia and non-infected (wild) individuals. All the steady states of the system are determined, namely extinction of both populations, extinction of the infected population and persistence of the non-infected one, and coexistence. Their local stability is analyzed, including Hopf bifurcation, which promotes periodic solutions around the nontrivial equilibrium points. Finally, one investigates the global asymptotic stability of the trivial solution. In the second manuscript, after rearing soybean looper Chrysodeixis includens in laboratory conditions, thermal requirements for this insect-pest are estimated, from linear and nonlinear regression models, as well as the intrinsic growth rate. This parameter depends on the life-history traits and can provide a measure of population viability of the species.
Doutor
Véron, Matthieu. "Variabilité de traits d'histoire de vie et implications pour la modélisation des dynamiques de population : application au stock de sardines du golfe de Gascogne Major changes in sardine growth and body condition in the Bay of Biscay between 2003 and 2016: Temporal trends and drivers, in Progress in Oceanography 182, March 2020." Thesis, Brest, 2020. http://www.theses.fr/2020BRES0026.
Повний текст джерелаUnderstanding factors and processes that determine life history strategies of marine populations is one of major challenge in fisheries ecology and a necessary prerequisite for effective conservation and management of such resources. In many marine exploited fishes, important changes in life history traits have been identified and appear tightly linked to global change. However, despite their importance in population dynamics, few stock assessment models account for their variability. This PhD thesis investigates the drivers of changes in life history traits of sardine (Sardina pilchardus) in the Bay of Biscay with the purpose of including them within the stock assessment model of this species. Based on both morphometric biological data, our results emphasized a strong decrease in sardine body condition with a critical period between 2007 and 2011. Analyses underlined a synchronous decline of growth rate at the population level which appeared strongly linked to environmental variability. In particular, they suggest a potential shift in the timing of the production and/or the quality of food. Furthermore, the strong dependence of sardine demographic processes upon body size evidenced in this study strongly supports the need for a size-based stock assessment model for this stock. Finally, the early developments of such a stock assessment model maid during this work bring new perspectives to improve sardine stock assessment
Sevillano, Garcia Mayeya Lucero. "The Effects of Biological Control Agents on Population Growth and Spread of Melaleuca quinquenervia." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/406.
Повний текст джерелаStrandberg, Per Erik. "Mathematical models of bacteria population growth in bioreactors: formulation, phase space pictures, optimisation and control." Thesis, Linköping University, Department of Mathematics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2337.
Повний текст джерелаThere are many types of bioreactors used for producing bacteria populations in commercial, medical and research applications.
This report presents a systematic discussion of some of the most important models corresponding to the well known reproduction kinetics such as the Michaelis-Menten kinetics, competitive substrate inhibition and competitive product inhibition. We propose a modification of a known model, analyze it in the same manner as known models and discuss the most popular types of bioreactors and ways of controlling them.
This work summarises much of the known results and may serve as an aid in attempts to design new models.
Cohen, Margaret A. "Estimating the growth rate of harmful algal blooms using a model averaged method." View electronic thesis (PDF), 2009. http://dl.uncw.edu/etd/2009-1/rp/cohenm/margaretcohen.pdf.
Повний текст джерелаKupka, Kasper. "Effects of population size, density and local environment on the population dynamics of the fragrant orchid (Gymnadenia conopsea)." Thesis, Uppsala universitet, Institutionen för biologisk grundutbildning, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447703.
Повний текст джерелаWebber, D'Arcy Nathan. "Demography and Population Projections of the Invasive Tunicate Styela clava in southern New Zealand." Thesis, University of Canterbury. Biological Sciences, 2010. http://hdl.handle.net/10092/4950.
Повний текст джерелаNothnagl, Margit. "Interaction between greenhouse grown chrysanthemum and Frankliniella occidentalis : a modelling approach /." Alnarp : Department of Crop Science, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200697.pdf.
Повний текст джерелаDentamaro, Alex Alves. "Estudo da evolução de modelos de crescimento populacional e métodos para obtenção de parâmetros /." Rio Claro, 2019. http://hdl.handle.net/11449/191288.
Повний текст джерелаResumo: Neste trabalho, será abordada a teoria matemática utilizada no estudo de quatro modelos clássicos de crescimento populacional: Malthus, Verhulst, Gompertz e Montroll. Serão apresentadas e/ou discutidas algumas de suas características, propriedades, diferenças e diferentes métodos para obtenção de seus parâmetros. Posteriormente, estes modelos e métodos serão aplicados a um conjunto de dados relativos ao crescimento populacional do Brasil. Também foi elaborada uma atividade para ser aplicada no Ensino Médio, na qual se explora, por tabelas e gráficos, a forma como os alunos observam certos fenômenos de crescimento, bem como, construtivamente e com auxílio de dados, a forma como ocorrem esses crescimentos de fato.
Abstract: In this work, the mathematical theory of four classic population growth models (Malthus, Verhulst, Gompertz and Montroll) will be addressed. Some of their characteristics, properties, differences and different methods for obtaining their parameters will be presented and/or discussed. Subsequently, these models and methods will be applied to a Brazilian population growth data set. An activity was also elaborated to be applied in high school. It explores, by tables and graphs, how students observe some growth phenomena, as well as, constructively and with the help of data, how these growths really occur.
Mestre
Levy, Amanda. "Use of Simulation Analyses to Investigate Yellowfin Tuna (Thunnus albacares) Growth Models in the Atlantic Ocean Incorporating Gear Selectivity." NSUWorks, 2012. http://nsuworks.nova.edu/occ_stuetd/177.
Повний текст джерелаEtienne, Freed. "Urban Growth and Segregation in the Roanoke, Virginia, Metropolis: The Effects of Low-Density Development on Low-Income Populations and Racial Minorities." VCU Scholars Compass, 2006. http://scholarscompass.vcu.edu/etd/1393.
Повний текст джерелаHeldt, Frank Stefan [Verfasser], Timo [Akademischer Betreuer] Frensing, and Udo [Akademischer Betreuer] Reichl. "Mathematical models of influenza A virus infection : from intracellular replication to virus growth in cell populations / Frank Stefan Heldt. Betreuer: Timo Frensing ; Udo Reichl." Magdeburg : Universitätsbibliothek, 2015. http://d-nb.info/1069159808/34.
Повний текст джерелаCorrêa, Christiane Erondina. "Ecologia de populações de Psychotria nuda (Rubiaceae) em Floresta Ombrófila Densa." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/315903.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-17T22:02:12Z (GMT). No. of bitstreams: 1 Correa_ChristianeErondina_D.pdf: 5936327 bytes, checksum: 06835275c2d435b9e58c2c5894d02a54 (MD5) Previous issue date: 2011
Resumo: Os habitats variam entre si quanta às características abióticas como luminosidade e topografia. A variação altitudinal pode conter essas diferenças e influenciar variações em escala individual e populacional das espécies. 0 objetivo geral desse trabalho foi descrever as características da espécie em escala do indivíduo, o padrão espacial e a dinâmica populacional do arbusto Psychotria nuda (Rubiaceae). Adicionalmente, verifica se há variação dessas características populacionais entre altitudes e dentro de cada altitude, considerando variações da topografia e luminosidade. 0 estudo foi realizado em Floresta Ombrófila Densa, no Parque Estadual da Serra do Mar em diferentes altitudes (Floresta de Restinga, Terras Baixas, Sub-Montana e Montana). Foram identificadas duas formas de crescimento, ereta e prostrada. lndivíduos prostrados podem apresentar crescimento clonal, encontrado em mais de 70% dos casas. 0 comprimento, o diâmetro, a área de copa e o módulo de elasticidade dos indivíduos eretos foram maiores comparados aos prostrados. Mais de 80% dos indivíduos amostrados ocorreram nas parcelas Terras Baixas. 0 comprimento foi semelhante entre altitudes, mas o diâmetro e a área da copa foram maiores nos indivíduos da Sub-Montana. A variação dos indivíduos localizados na Sub-Montana foi menor comparado aos indivíduos nas Terras Baixas. 0 padrão espacial diferiu entre as altitudes. Na Sub-Montana e na Restinga a distribuição foi agregada à pequenas distâncias e na Terras Baixas foi aleatória. Para todas as altitudes não houve variação temporal do padrão espacial. Mesmo avaliando a distribuição dos indivíduos por tamanho ou forma de crescimento, as variações influenciadas pela altitude foram preponderantes. A distribuição da densidade dos indivíduos não esteve relacionada a variações da topografia e luminosidade. 0 crescimento individual variou pouco ao Iongo do tempo e entre altitudes. Não houve variação da taxa de crescimento decamétrico com as classes de diâmetro dos indivíduos. As taxas de crescimento decamétrico não estavam relacionadas as variáveis abióticas. A taxa de crescimento populacional foi positiva, próxima a 1, nas duas altitudes. As taxas de mortalidade e de recrutamento foram muito semelhantes entre altitudes e não variaram temporal ou espacialmente. Indivíduos menores são mais freqüentes nas populações estudadas e a probabilidade de reprodução esteve associada ao tamanho do indivíduo. A maior proporção indivíduos reprodutivos na população foi encontrada na Sub-Montana. A maioria dos indivíduos permaneceu na classe de diâmetro inicial. Houve casos de regressão em até duas classes de diâmetro que podem significar a diminuição de tamanho ou fragmentação de rametas. O ingresso por reprodução sexuada foi pequeno sendo a maior parte dos recrutas originados por propagação vegetativa (91,6%). As duas altitudes diferiram quanto as contribuições para as diferenças encontradas no ?a, indicando que diferentes transições são importantes em cada hábitat. Algumas características populacionais estudadas variaram mais fortemente com a altitude em comparação a outros. As diferenças destacam que as populações das duas altitudes mantiveram estabilidade, entretanto a partir de estratégias diferentes. Na altitude maior os indivíduos foram maiores e apenas indivíduos grandes foram reprodutivos. Na altitude menor os indivíduos iniciam a reprodução com tamanho menor e ocorre maior entrada de indivíduos por propagação vegetativa
Abstract: The habitats may differ among themselves by abiotic traits like light and slope. The altitudinal variation may include these differences and influence changes in species on both individual and populational scales. The goals of this work were to describe individual traits, spatial pattern and population dynamic of shrub Psychotria nuda. Besides verify if there were variations of these population traits between altitudes and in each altitude considering slope and canopy openness variations. We developed this work in Dense-Ombrophylous Forest of Serra do Mar State Park in distinct altitudes. Two growth forms were recognized, erect and prostrate. The prostrate growth form includes the plants derived from clonal growth which is present in more than 70% of recorded individuals. The length, diameter, crown area and elastic modulus of erect growth form were higher than the prostrate one. More than 80% of the individuals occurred in the Lowland Secondary-Dense-Ombrophylous Forest. The length was similar between altitudes, but the diameter and crown area were higher in SM. Plants variations were smaller in Submontane Secondary-Dense-Ombrophylous Forest plots than in Lowland Secondary-Dense-Ombrophylous Forest. In Submontane Secondary Dense-Ombrophylous Forest and Coastal Plain Forest the distribution were aggregate to small distances and in Lowland Secondary-Dense-Ombrophylous Forest was random. There was no variation for all altitudes over time. Even evaluated the individuals distribution by size or growth form, the variations was mainly influenced by altitude. Individuals' density distribution was not related with slope and canopy openness variations. The individual growth of Psychotria nuda varies little over time and between altitudes. The diameter growth rate did not vary with individual's diameter class and with abiotic traits. Growth rate was positive and equals to one in both altitudes. Mortality and recruitment were similar between altitudes and did not vary in time and space. The smaller diameter classes were the most frequent ones and the reproduction probability was related with plant size. The proportion of reproductive plants was higher in Submontane Secondary-Dense-Ombrophylous Forest. Most plants remained in the original diameter class. There were some cases with regression of up to two diameter classes that may mean size reduction or ramets fragmentation. There was a little input of recruits from sexual reproduction. Almost all recruits came from vegetative propagation (91,6%). The contributions to variability in ? were different between altitudes due to distinct important transitions in each altitude. Some population traits varied more strongly with altitude than others. The differences highlight that two altitudes populations maintained stability, but from different strategies. At higher altitude, plants were larger than those on lower altitude and just the bigger ones were reproductive. At lower altitude plants start reproduction earlier than in higher altitude and had more input of recruits from vegetative propagation.
Doutorado
Ecologia
Doutor em Ecologia
Rézouki, Célia. "The influence of lifestyle on demographic responses to climate change : the Alpine marmot as a case study." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1161/document.
Повний текст джерелаUnderstanding populations' response to environmental variation is a central issue of ecology, and has become a compelling goal in the last years due to climate change. In this broad context we could expect some species-specific ecological characteristics known to influence life history traits, such as lifestyle, to shape the demography of populations in variable environments as well as structure between-species differences in response to environmental change. Yet, the influence of species' lifestyle on population demographic responses to environmental variation is still poorly understood. During my PhD, I tried to fill this gap primarily through the analysis of an extensive data set of an Alpine marmot (Marmota marmota) population in the Alps. Alpine marmots present a particular lifestyle. 1ndividuals live in family groups of variable size, typically composed of one dominant breeding pair, of sexually mature and immature subordinates and of pups of the year. Half the year, they hibernate together in burrows and practise cooperative breeding with male subordinates acting as helpers for the pups, increasing their survival probability during hibernation. I first investigated how the marmot's lifestyle (hibernation and sociality) mediated the effects of weather fluctuations on age-specific survival variation. I found that juvenile survival strongly decreased over the years because of inter-related effects of harsher winter weather conditions and social factors (i.e., decrease in helpers' presence). In a second step, I studied the adaptive value of cooperative breeding in this Alpine marmot population, and showed that the positive influence of helpers' presence on juvenile survival was vanishing with climate change. The Alpine marmot population is currently decreasing accordingly. However, in parallel to the latter changes, I found a better access to dominance for subordinate individuals over the years, compensating in part this decrease, and highlighting a complex influence of sociality on marmot response to climate change. Finally, I compared the demography of the Alpine marmot population with that of an Alpine chamois (Rupicapra rupicapra) population, subjected to similar weather conditions in the Alps. I was able to show that the difference in lifestyle and reproductive tactic between these species shaped their demographic responses to environmental variation, providing them with differentresistance to current environmental change
Kubík, Rudolf. "Lidský kapitál jako determinanta ekonomického růstu." Doctoral thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-114429.
Повний текст джерелаXU, JIA-HUI, and 徐嘉惠. "The population growth process of brown planthopper:temperature dependent model." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/81915506355626958737.
Повний текст джерела