Thèses sur le sujet « Modelling studies »
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Ismail, Raveem. « Modelling studies on global contrails ». Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669992.
Cullum, Jodie. « Modelling studies of exoplanetary oceans ». Thesis, University of East Anglia, 2018. https://ueaeprints.uea.ac.uk/67833/.
Henderson, Ian A. « Studies related to measurement and modelling ». Thesis, University of Strathclyde, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248871.
Oliver, Sophia. « Modelling studies of the atmospheric tides ». Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365773.
Downing, Anna Kristina. « NMR structural studies and modelling proteins ». Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334225.
Sands, Zara Amanda. « Modelling studies of DNA recognition events ». Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428950.
Ledezma, RosaliÌa Diana DiÌaz. « Three studies in credit risk modelling ». Thesis, City University London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397858.
Square, Lynndle Caroline. « Proton conductivity stability studies by modelling ». University of the Western Cape, 2016. http://hdl.handle.net/11394/6121.
In this thesis, some of the challenges experienced by high temperature polymer electrolyte membrane fuel cells are explored through material modelling techniques. A very important aspect for a fuel cell is that it should have high proton conductivity. As hydrogen enters a fuel cell it gets broken down into its constituents, protons and electrons. The electrons travel to an external load, whilst the protons travel through a diffusive layer, catalyst layer and membrane area, before recombining with oxygen to form water and leave the system. In this particular study, polytetrafluoroethylene and carbon form the diffusive layer, platinum the catalyst and poly(2,5-benzimidazole) doped with phosphoric acid the membrane area. The effects to proton conductivity are investigated as a result of the mixing of materials and adsorption of the phosphoric acid on the platinum active sites. A third study as an alternative avenue for proton conductivity improvements, is also explored. The results from these investigations promotes the idea that polytetrafluoroethylene, which is found in the ionomer layer, should be replaced as its mechanical properties decrease significantly with increase in temperature. Increasing pressure would further promote proton transfer over the doped polymer membrane region.
Walker, Jemma. « Bayesian modelling in genetic association studies ». Thesis, London School of Hygiene and Tropical Medicine (University of London), 2012. http://researchonline.lshtm.ac.uk/1635516/.
Boyett, Robin Ernest. « Computational studies of hydrophobic porphyrins ». Thesis, University of Sussex, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241621.
Gardner, J. M. F. « Synthetic and modelling studies on marine cembranolides ». Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293584.
Arinaminpathy, Thayalini. « Modelling and simulation studies of glutamate receptors ». Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413984.
Kaye, Samantha Louise. « Modelling and simulation studies of NMDA receptors ». Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442836.
Capener, Charlotte E. « Modelling and simulation studies of potassium channels ». Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249241.
Law, Richard J. « Modelling and simulation studies of membrane proteins ». Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249273.
Jiranusornkul, Supat. « Molecular modelling studies of DNA damage recognition ». Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/11303/.
Dai, F. « Load modelling for power system stability studies ». Thesis, University of Manchester, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578290.
Oliver, L. J. « Modelling individual heterogeneity in mark-recapture studies ». Thesis, University of Kent, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595295.
Wat, Rex Man Shing. « Experimental modelling studies of miscible flooding processes ». Thesis, University of Exeter, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310076.
Haider, Syed Muhammed Shozeb. « Structural and modelling studies of quadruplex DNA ». Thesis, Institute of Cancer Research (University Of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408250.
Grau, Crespo Ricardo. « Computer modelling studies of iron antimonate FeSbOâ‚„ ». Thesis, Birkbeck (University of London), 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429418.
Larwood, Vivienne Lynne. « Modelling studies of factors affecting gellan gelation ». Thesis, University of Surrey, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320909.
Sanderson, Michael George. « Experimental and modelling studies of atmospheric chemistry ». Thesis, University of York, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259802.
Hadjigeorgiou, Christina. « Molecular modelling studies on bidentate iron chelators ». Thesis, King's College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298845.
Ellis, Richard Raymond. « MRI and modelling studies of drying phenomena ». Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611581.
Collin, Adam John. « Advanced load modelling for power system studies ». Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8890.
Olauson, Jon. « Modelling Wind Power for Grid Integration Studies ». Doctoral thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-302837.
Moral, Rafael de Andrade. « Statistical modelling of data from insect studies ». Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-06042018-153400/.
Dados provenientes de estudos com insetos podem apresentar características diferentes. Respostas univariadas podem ser analisadas utilizando-se modelos lineares generalizados (dados contínuos e discretos), modelos de análise de sobrevivência (dados de tempo até ocorrência de um evento), modelos de efeitos mistos (dados longitudinais), dentre outros métodos. Esses modelos podem ser usados para analisar dados provenientes de experimentos que avaliam processos ecológicos complexos, como competição e predação. Nesse sentido, ferramentas computacionais são úteis para pesquisadores em diversos campos, por exemplo, biologia e fisiologia de insetos, ecologia aplicada e controle biológico. Utilizando diferentes conjuntos de dados entomológicos como motivação, assim como outros tipos de dados para ilustrar os métodos, este trabalho teve como objetivos desenvolver novos modelos e ferramentas para avaliar a qualidade do ajuste. Foram propostos modelos de tempo de vida acelerado mistos, com modelagem simultânea dos parâmetros de locação e de escala com regressores, para analisar dados de tempo até ataque de um experimento que avaliou escolha de predadores. Foram utilizados modelos exponencial, Weibull e Weibull-exponenciado, e a qualidade do ajuste foi avaliada utilizando gráficos meio-normais com envelope de simulação. Esses gráficos são o assunto de um Capítulo inteiro sobre um pacote para o software R, chamado hnp, desenvolvido para implementá-los. Foram utilizados conjuntos de dados de diferentes tipos de experimentos para ilustrar o uso desses gráficos e do pacote. Uma extensão bivariada para os modelos chamados \"N-mixture\" foi proposta para analisar dados longitudinais de contagem para duas espécies pertencentes à mesma teia trófica, que podem interagir direta e indiretamente, e conjuntos de dados provenientes de estudos ecológicos são usados para ilustrar a abordagem. Uma vantagem dessa estratégica de modelagem é a obtenção de um coeficiente de correlação assimétrico, que pode ser utilizado por ecologistas para inferir acerca do grau de associação entre espécies. O pacote jointNmix foi desenvolvido para implemetar o processo de estimação para esses modelos. Finalmente, foi proposta uma ferramenta de avaliação de qualidade do ajuste para modelos bivariados, análoga ao gráfico meio-normal com envelope de simulação, e a metodologia _e ilustrada com dados simulados e dados de competição de insetos. Essa ferramenta está também implementada em um pacote para o R, chamado bivrp. Todo o software desenvolvido nesta tese está disponível, gratuitamente, na Comprehensive R Archive Network (CRAN).
Laskiewicz, Marek. « Casual modelling of businesses ». Thesis, Queen Mary, University of London, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300105.
Ellis, Dianne D. « Structural studies of phosphines and phosphites ». Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.482802.
Hand, Karen Jayne. « Computational studies of protein-ligand interactions ». Thesis, University of York, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282271.
Greaves, Richard Brian. « Computational studies of protein structure and function ». Thesis, University of York, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387165.
King, Matthew James Stuart. « Experimental and modelling studies of transient slug flow ». Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/8270.
Downing, Anna Kristina. « N.M.R. structural studies and modelling of modular proteins ». Thesis, University of Oxford, 1993. https://ora.ox.ac.uk/objects/uuid:a8c88faa-08ee-4374-a384-b7116c551ef1.
Li, Yazhuo. « Crystallographic and molecular modelling studies of NQO2-complexes ». Thesis, University of Nottingham, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.537673.
Bailey, J. « Theoretical modelling studies of aggregation and molecular interactions ». Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596263.
Basse, Britta. « Case studies in mathematical modelling for biological conservation ». Thesis, University of Canterbury. Mathematics & ; Statistics, 1999. http://hdl.handle.net/10092/4804.
Khan, Nasar Ahmed. « Modelling and mass transfer studies in continuous crystallisers ». Thesis, Teesside University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410867.
Pardo-Benito, J. Mauricio. « Modelling studies on freeze-drying of coffee extracts ». Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394175.
Rabias, Ioannis. « Theoretical and computational modelling studies of conducting polymers ». Thesis, University of Surrey, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310151.
Bentley, Mark Stephen. « Space weathering on mercury : laboratory studies and modelling ». Thesis, Open University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413806.
Parkin, Andrew. « Crystallographic and modelling studies of transition metal complexes ». Thesis, University of Edinburgh, 2002. http://hdl.handle.net/1842/12767.
Yang, He. « Numerical modelling studies on asymmetries in tropical cyclones ». Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.646002.
Mulvihill, Daniel Martin. « Studies of frictional interface behaviour : experiments and modelling ». Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:54e18b10-1167-40f1-9dc9-0ca529a56f34.
Glasspool, David William. « Modelling serial order in behaviour : studies of spelling ». Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391254.
Lindblad, Louise. « Modelling and Simulation ofGNC/AOCS Systemsfor Conceptual Studies ». Thesis, KTH, Mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202627.
Klyukin, Yury Igorevich. « Modelling and analytical studies of magmatic-hydrothermal processes ». Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/84442.
Ph. D.
Masenya, Mamago Adolphina. « Computational modelling studies of precious mixed metals sulphides ». Thesis, University of Limpopo, 2016. http://hdl.handle.net/10386/1725.
The stabilities of PtS to PdS and PdS to PtS were investigated using density functional theory within the generalized gradient approximation. Their structural, electronic and mechanical properties were determined to show their stability and the effect of pressure on different compositions. We found good correlation of calculations with available ex-perimental data. The lattice parameters were observed to fluctuate with increasing con-centration for both systems. Furthermore, heats of formation were calculated to deter-mine the relative structural stability of the systems. They predict that the most stable structure is Pd50S50 P42/mmc and Pt25Pd25S50 P42/mmc being the least stable. Pd12.5Pt37.5S50 P42/m is the most stable and Pd50S50 P42/m being the least stable struc-ture. The Pt37.5Pd12.5S50 P1 was said to be the most stable structure and Pd50S50 P1 be-ing the least stable. The phonon dispersion calculations show that Pt50S50 P42/mmc, Pd50S50 P42/mmc, Pd12.5Pt37.5S50 P42/m and Pt50S50 P1 (derived from P42/mmc) are me-chanically stable, consistent with calculated elastic constants. The Pt25Pd25S50 P42/mmc show soft modes, which are due to vibrations of Pt and Pd atoms in the x - y plane which suggests the instability of the structure, in agreement with C66 being negative, and consistent with heats of formation. The lattice parameters decreased steadily with increasing pressure. An anomaly was observed in Pt50S50 P1 (derived from P42/mmc), where the c lattice parameter was found to increase with increasing pressure. The elec-tronic density of states (DOS) were performed on all compositions. The DOS were sub-jected to pressure and it was generally noted that the band gap increases with increas-ing pressure. It was observed that the smaller the band gap, the more stable the struc-ture. Furthermore, phonon dispersions under pressure show that compounds with the P42/mmc and P1 (from P42/mmc) symmetries display the mixing of lower and upper en-ergy bands at pressures above 30 GPa.
National Research Foundation
Alessandri, Jacopo <1989>. « Coastal modelling studies for forecasting and remediation solutions ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10075/1/Alessandri_Jacopo_Tesi.pdf.
Lima, Alessandra Vallim [UNESP]. « Niche Modelling : a comparison between modelling methods best applied for Cnidaria niche dispersion studies ». Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150823.
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Nas ultimas décadas, modelagem de nicho ecológico vem recebendo maior atenção em diversas áreas da biologia devido a evolução dos computadores pessoais e aumento dos dados disponíveis utilizados para a modelagem. Os resultados obtidos podem ser utilizados em ações preventivas, tais quais manejo de espécie e acompanhamento da distribuição de espécies invasoras. Desde o aumento dessa popularidade, diversos algoritmos estão disponíveis e testes estão em andamento para averiguar suas performances em relação a diferentes filos. Invertebrados marinhos, mais especificamente cnidários, apresentam poucos estudos nesse ramo, devendo receber mais atenção nos próximos anos devido ao aumento global das populações de aguas vivas (blooms), e branqueamento em quase todos os recifes de corais. Devido a essa lacuna em informação, este grupo foi escolhido para comparar três algoritmos. Utilizamos o MAXENT, GARP e AquaMaps em suas formas de desktop e os selecionamos baseado em outros estudos comparando algoritmos. Utilizamos diferentes organismos do filo cnidária, Lychnorhiza lucerna, Chrysaora lactea, Phyllorhiza punctata, Tamoya haplonema, Ceriantheomorphe brasiliensis e Mussismilia hispida, para comparar os algoritmos e averiguar qual demonstrou melhor performance. Nossos resultados mostram que o MAXENT superou os outros algoritmos tanto com relação a Área Sob a Curva ROC (AUC), quanto com relação aos mapas de distribuição. O GARP apresentou resultados variados com mapas generalizados e AquaMaps foi o menos confiável. Nossos resultados são similares aqueles encontrados em diversas publicações, significando então, que o MAXENT é o algoritmo mais confiável em se tratando da modelagem de nicho desses organismos.
Recently, ecological niche modelling has been receiving more attention in several areas in biology, due to the evolution of personal computers, and the increasing availability of data used in modelling. The results obtained can be used in preventive actions such as species management and invasive species distribution. Since its increasing popularity, several algorithms are available and undergoing tests regarding their performance towards different phylum. Marine invertebrates, more specifically cnidarians, present few studies on this field, and should receive closer attention in the next years due to worldwide increases in jellyfish population (blooms), and bleaching in almost every known shallow water coral reef. Because of this gap of information, we chose this still poor studied group to compare three algorithms. We used MAXENT, GARP and AquaMaps in its desktop form and selected them based on other studies comparing algorithms. Our aim was to, based on different organisms of the phylum Cnidaria, Lychnorhiza lucerna, Chrysaora lactea, Phyllorhiza punctata, Tamoya haplonema, Ceriantheomorphe brasiliensis and Mussismilia hispida, compare those algorithms and examine which one performed the best. Our results shown that MAXENT outperformed the other algorithms both regarding de Area Under the ROC Curve (AUC) and the map distribution. GARP show varying results with generalized maps and AquaMaps was the least accurate of them. Our results are similar to those found in other papers, thus meaning that MAXENT is the most reliable software when it comes to modelling these animals.