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Dissertations / Theses on the topic 'Bayer Process'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Xu, Bingan. "Lime chemistry in the Bayer process." Thesis, Xu, Bingan (1991) Lime chemistry in the Bayer process. PhD thesis, Murdoch University, 1991. https://researchrepository.murdoch.edu.au/id/eprint/52725/.

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A fundamental study of the kinetics and mechanism of lime chemistry in the Bayer process has been undertaken. To simplify the study and avoid interference from impurities, experiments were carried out in relatively pure systems. Calcium hydroxide and calcium oxide, the solid reactants, were used in two different forms: rotating discs and powders. The former gives the most useful mechanistic information, while the latter most closely approximates industrial practice. The structure and composition of the surface was also investigated using a variety of techniques including scanning electron micr

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2

Lee, Mei-yin. "The mechanism of gibbsite crystal growth in Bayer liquor." Thesis, Curtin University, 1998. http://hdl.handle.net/20.500.11937/759.

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Although the precipitation of aluminium trihydroxide as gibbsite, via the Bayer process has been widely studied, the mechanism of crystal growth is poorly understood. This work focus on the morphology of gibbsite and the relative growth rates of individual crystal faces.Initial work was carried out to characterize aluminium trihydroxide and it was found that bayerite, another polymorph, precipitated at temperatures below 50 [degrees] C and its morphology depended on the method of precipitation. Gibbsite however, precipitated above this temperature and its morphology depended on the type of alk

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3

Kenyon, Nicola Jane. "Investigation of scale formation in the Bayer process." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494464.

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4

Jamieson, Evan John. "Development and utilisation of Bayer process by-products." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/198.

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The Bayer Process is the hydrometallurgical treatment of bauxite ore for the extraction of alumina. This thesis reports on the development and utilisation of key by-products including:• Carbonated Red Mud and Alkaloam® - produced from the fine bauxite residue commonly termed red mud• Red Sand™ - manufactured from coarse bauxite residue• Red Lime™ - a by-product of liquor causticisation• Bayer-derived geopolymers - a cement replacement made from processed Bayer liquor.

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5

Perron, Alexandre. "Mesure de vitesse dans une solution électrolytique à force ionique élevée par une méthode électrochimique /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2003. http://theses.uqac.ca.

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6

Armstrong, Jennifer Ann. "The investigation of scale formation in the Bayer process." Thesis, Loughborough University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251012.

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7

Péloquin, Guy. "Modélisation mathématique de la décantation de boue rouge /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2003. http://theses.uqac.ca.

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8

Lee, Mei-yin. "The mechanism of gibbsite crystal growth in Bayer liquor." Curtin University of Technology, School of Applied Chemistry, 1998. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10719.

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Although the precipitation of aluminium trihydroxide as gibbsite, via the Bayer process has been widely studied, the mechanism of crystal growth is poorly understood. This work focus on the morphology of gibbsite and the relative growth rates of individual crystal faces.Initial work was carried out to characterize aluminium trihydroxide and it was found that bayerite, another polymorph, precipitated at temperatures below 50 [degrees] C and its morphology depended on the method of precipitation. Gibbsite however, precipitated above this temperature and its morphology depended on the type of alk

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9

Tromans, Andrew J. "Solution chemistry of some dicarboxylate salts of relevance to the Bayer process /." Access via Murdoch University Digital Theses Project, 2003. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040730.140604.

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10

Normandin, Mélanie. "Étude sur la clarification d'une suspension de boue rouge et de liqueur Bayer par floculation /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2005. http://theses.uqac.ca.

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Thèse (M.Eng.) -- Université du Québec à Chicoutimi, 2005.<br>La p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en ingénierie. CaQQUQ Bibliogr.: f. 128-131. Document électronique également accessible en format PDF. CaQQUQ

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11

au, A. Tromans@chem murdoch edu, and Andrew John Tromans. "Solution Chemistry of some Dicarboxylate Salts of Relevance to the Bayer Process." Murdoch University, 2001. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20040730.140604.

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This thesis deals with certain aspects of the solution chemistry of the simple dicarboxylate anions: oxalate, malonate and succinate, up to high concentrations. These ions are either significant impurities in the concentrated alkaline aluminate solutions used in the Bayer process for the purification of alumina, or are useful models for degraded organic matter in industrial Bayer liquors. Such impurities are known to have important effects on the operation of the Bayer process. To develop a better understanding of the speciation of oxalate (the major organic impurity in Bayer liquors) in conc

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12

Tromans, Andrew John. "Solution chemistry of some dicarboxylate salts of relevance to the Bayer process." Thesis, Tromans, Andrew John (2001) Solution chemistry of some dicarboxylate salts of relevance to the Bayer process. PhD thesis, Murdoch University, 2001. https://researchrepository.murdoch.edu.au/id/eprint/371/.

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These ions are either significant impurities in the concentrated alkaline aluminate solutions used in the Bayer process for the purification of alumina, or are useful models for degraded organic matter in industrial Bayer liquors. Such impurities are known to have important effects on the operation of the Bayer process. To develop a better understanding of the speciation of oxalate (the major organic impurity in Bayer liquors) in concentrated electrolyte solutions, the formation constant (Log Beta) of the extremely weak ion pair formed between sodium (Na+) and oxalate (Ox2-) ions was determine

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13

Tromans, Andrew John. "Solution chemistry of some dicarboxylate salts of relevance to the Bayer process." Tromans, Andrew John (2001) Solution chemistry of some dicarboxylate salts of relevance to the Bayer process. PhD thesis, Murdoch University, 2001. http://researchrepository.murdoch.edu.au/371/.

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These ions are either significant impurities in the concentrated alkaline aluminate solutions used in the Bayer process for the purification of alumina, or are useful models for degraded organic matter in industrial Bayer liquors. Such impurities are known to have important effects on the operation of the Bayer process. To develop a better understanding of the speciation of oxalate (the major organic impurity in Bayer liquors) in concentrated electrolyte solutions, the formation constant (Log Beta) of the extremely weak ion pair formed between sodium (Na+) and oxalate (Ox2-) ions was determine

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14

FROTA, Luis Eduardo Medeiros. "Avaliação do uso de diferentes fontes de bauxita no processo de produção de óxido de alumínio." Universidade Federal de Campina Grande, 2012. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/256.

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Submitted by Dilene Paulo (dilene.fatima@ufcg.edu.br) on 2018-02-05T15:39:20Z No. of bitstreams: 1 LUIS EDUARDO MEDEIROS FROTA – DISSERTAÇÃO PPGEQ 2012.pdf: 1801644 bytes, checksum: 1d91f3ec19c316106682f868684e0357 (MD5)<br>Made available in DSpace on 2018-02-05T15:39:20Z (GMT). No. of bitstreams: 1 LUIS EDUARDO MEDEIROS FROTA – DISSERTAÇÃO PPGEQ 2012.pdf: 1801644 bytes, checksum: 1d91f3ec19c316106682f868684e0357 (MD5) Previous issue date: 2012-05-16<br>O Oxido de alumínio, Al2O3, comumente chamado de alumina se trata de um composto químico de ampla utilização na indústria estando pres

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15

Sipos, Gabriella. "The mechanisms of action of sodium oxalate seed stabiliser molecules under Bayer conditions." Thesis, Curtin University, 2001. http://hdl.handle.net/20.500.11937/1922.

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Sodium oxalate is one of the many organics present in Bayer liquor. Due to its limited solubility, sodium oxalate can co-precipitate with alumina trihydrate during precipitation. This can have detrimental effects on the final product quality, especially if it occurs in the initial stages of precipitation.Quaternary amine type cationic surfactants can prevent sodium oxalate co-precipitation and increase the tolerable concentration of sodium oxalate in Bayer liquor. Their action is via the inhibition of nucleation or/and the inhibition of crystal growth. This study presents work detailing the ef

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16

Smith, Fraser O. "Discontinuous flow analyser for process chemical analysis." Thesis, Queensland University of Technology, 1999.

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17

Wu, Fei. "Aluminous goethite in the bayer process and its impact on alumina recovery and settling." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/1954.

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Aluminium substituted goethite present in the Bayer process is closely related to settling problem and reduction of alumina recovery. The finer particle size and larger specific surface area of Al-substituted goethite compared with those of hematite contribute to the negative effects to the Bayer circuit.The project aims to improve the settling performance and recover alumina from aluminous goethite by hydrothermal transformation of Al-goethite to hematite/Al-hematite in the Bayer digestion process.A hypothesis of the solubility limit in goethite-diaspore solid solution (Al-goethite) has been

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18

Tabassum, Rasheed, and tabassum rasheed@svt com au. "Scale growth study in a concentric reducer: Measurement of instantaneous velocity using Particle Image Velocimetry." Central Queensland University. School of Advance Technology and Processes, 2005. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060720.095421.

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Gibbsite scale growth in pipe fittings is a major problem for an alumina refinery. A recent investigation into the scale growth mechanism at an alumina refinery found almost 60 % more scale growth in a reducer when compared with the connecting straight pipe sections for similar flow conditions. Scale growth occurs where liquor (supersaturated solutions) come in contact with solid surfaces and it is affected by the liquor flow velocity besides other physical and chemical parameters. The present work is dedicated to study the hydro-dynamical aspects of the mechanism of scale growth. In particula

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19

Sipos, Gabriella. "The mechanisms of action of Sodium oxalate seed stabiliser molecules under Bayer conditions /." Curtin University of Technology, School of Applied Chemistry, 2001. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=12616.

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Sodium oxalate is one of the many organics present in Bayer liquor. Due to its limited solubility, sodium oxalate can co-precipitate with alumina trihydrate during precipitation. This can have detrimental effects on the final product quality, especially if it occurs in the initial stages of precipitation.Quaternary amine type cationic surfactants can prevent sodium oxalate co-precipitation and increase the tolerable concentration of sodium oxalate in Bayer liquor. Their action is via the inhibition of nucleation or/and the inhibition of crystal growth. This study presents work detailing the ef

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20

Brady, James Peter. "An examination of the applicability of hydrotalcite for removing oxalate anions from Bayer process solutions." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46165/1/James_Brady_Thesis.pdf.

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Hydrotalcite and thermally activated hydrotalcites were examined for their potential as methods for the removal of oxalate anions from Bayer Process liquors. Hydrotalcite was prepared and characterised by a number of methods, including X-ray diffraction, thermogravimetric analysis, nitrogen adsorption analysis and vibrational spectroscopy. Thermally activated hydrotalcites were prepared by a low temperature method and characterised using X-ray diffraction, nitrogen adsorption analysis and vibrational spectroscopy. Oxalate intercalated hydrotalcite was prepared by two methods and analysed with

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21

Jones, Alan. "Production and utilisation of Bayer Process Red Sand™ for construction and its beneficiation by magnetic separation." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/393.

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The extraction of alumina from bauxite produces a high volume by-product which is stored in secure impoundments. In Western Australia, typically half of the by-product has a particle size in excess of 90 microns and is called Red Sand™ by Alcoa of Australia Limited (Alcoa). This coarse fraction is unique to Western Australia due to the high quartz content of bauxite from the Darling Range. Alcoa has three Western Australian refineries and this coarse fraction represents a potential resource of up to 20,000 tonnes per day.Red Sand™ currently requires storage in large and expensive impoundment s

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22

Boivin, Alain. "Étude expérimentale sur le compactage de la boue rouge dans un décanteur semi-industriel /." Thèse, Chicoutimi : [Rimouski : Université du Québec à Chicoutimi ;. Université du Québec à Rimouski], 2004. http://theses.uqac.ca.

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Thèse (M.Eng.) -- Université du Québec à Chicoutimi, programme extensionné à l'Université du Québec à Rimouski, 2003.<br>Bibliogr.: f. [189-195]. Document électronique également accessible en format PDF. CaQCU

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23

Kurucak, Abdurrahman. "Flow Sheet Optimization By The Concept Of Sustainable Development: Alumina Industry." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611680/index.pdf.

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In this study, effects of changes in various parameters of the Bayer process on the amount of &ldquo<br>red mud&rdquo<br>, which has many environmental drawbacks, were examined in accordance with the principles of &ldquo<br>sustainable development&rdquo<br>. The production process of SeydiSehir Aluminum Plant is modeled as a case study. First a steady-state mass balance calculation is carried out by incorporating sequential modular approach. Then a model of the Bayer process digester is programmed and several simulations are carried out using this model. Results of the mass balance calculation

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24

Jayalatharachchi, Vishakya. "Understanding desilication products in bauxite refinery residues." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/101127/1/Vishakya_Jayalatharachchi_Thesis.pdf.

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This research developed standard methods for quantifying and identifying alkali compounds in red mud, with a particular focus on desilication compounds. X-ray diffraction and infrared spectroscopy were used as they are relatively accessible and fast characterisation techniques for industry to use. This research is of particular importance as it will enable better predictions to be made on the suitability/stability of red mud in land rehabilitation programs.

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25

Jitsangiam, Peerapong. "Performance, evaluation, and enhancement of red sand for road bases, embankments, and seawall fills." Thesis, Curtin University, 2007. http://hdl.handle.net/20.500.11937/1733.

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Australia produces approximately 40% of the world’s bauxite and over 30% of the world’s alumina. Each year, about 25 million tonnes of bauxite residue is produced in Australia, requiring storage and maintenance. The construction and operation of such large impoundment areas is costly. During the extraction of alumina from bauxite ore using the Bayer process, a fine residue is produced called Red Mud. In West Australia, Darling Range bauxite deposits contain high levels of quartz which result in a coarse residue fraction also being produced. This fraction has been termed Red Sand with a typical

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26

Torres, Armando Antonio de Oliveira. "Modelagem do processo Bayer utilizando o software comercial Aspen Plus." [s.n.], 2001. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267614.

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Orientador: Maria Regina Wolf Maciel<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-01T10:10:37Z (GMT). No. of bitstreams: 1 Torres_ArmandoAntoniodeOliveira_M.pdf: 3727476 bytes, checksum: fd50582b75f3a0a86a9bcd1a8428aa68 (MD5) Previous issue date: 2001<br>Resumo: O Processo Bayer é definido como uma tecnologia para a produção de óxido de alumínio (Ah03), principal matéria prima para a produção de Alumínio. Este processo transforma o minério de bauxita em alumina Ah03, utilizando soda cáustica e vapor gera

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27

Escobar, Eduardo Marchioni. "Determinação simultanea, em linha, da concentração de soda caustica e de alumina em solução de aluminato de sodio do processo bayer de produção de oxido de aluminio." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248534.

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Orientador: Marcia Miguel Castro Ferreira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-04T07:45:07Z (GMT). No. of bitstreams: 1 Escobar_EduardoMarchioni_M.pdf: 4616166 bytes, checksum: 408a53eb5fa36485cc72a600c9361d94 (MD5) Previous issue date: 2004<br>Mestrado<br>Físico-Química<br>Mestre em Química

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Garcia, Marta Cristina Suarez. "Modificação do resíduo de bauxita gerado no processo Bayer por tratamento térmico." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-13062013-121328/.

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A lama vermelha é o resíduo gerado pela Indústria do Alumínio. Assim como outros resíduos industriais apresenta características complexas com inúmeras dificuldades de manipulação, além de ser um material perigoso pela sua baixa granulometria e alcalinidade. É um resíduo com potencial poluidor alto, agravado pela forma de disposição vulnerável geralmente adotada, sendo esta a disposição do resíduo em lagoas projetadas para esta finalidade. O estudo e desenvolvimento de alternativas sustentáveis para a utilização da lama vermelha devidamente tratada como matérias-primas de outros processos são

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QUARESMA, Danielly da Silva. "Estudo hidrometalúrgico de compostos de titânio proveniente do resíduo do processo Bayer." Universidade Federal do Pará, 2012. http://repositorio.ufpa.br/jspui/handle/2011/3420.

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REIS, André Wilson da Cruz. "Caracterização mineralogica do agregado obtido a partir da lama vermelha do processo bayer." Universidade Federal do Pará, 2014. http://repositorio.ufpa.br/jspui/handle/2011/7707.

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Avelar, Angela Nair. "Influência da mineralogia na etapa de separação da lama vermelha no processo Bayer." Programa de Pós-Graduação em Engenharia Mineral. Departamento de Engenharia de Minas, Escola de Minas, Universidade Federal de Ouro Preto, 2011. http://www.repositorio.ufop.br/handle/123456789/2349.

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Submitted by Stéfany Moreira (stemellra@yahoo.com.br) on 2013-02-25T12:42:28Z No. of bitstreams: 1 DISSERTAÇÃO_InfluênciaMineralogiaEtapa.pdf: 8356294 bytes, checksum: 8e302b474028b3eec183bfd3ccf87334 (MD5)<br>Approved for entry into archive by Neide Nativa (neide@sisbin.ufop.br) on 2013-02-25T14:08:56Z (GMT) No. of bitstreams: 1 DISSERTAÇÃO_InfluênciaMineralogiaEtapa.pdf: 8356294 bytes, checksum: 8e302b474028b3eec183bfd3ccf87334 (MD5)<br>Made available in DSpace on 2013-02-25T14:08:56Z (GMT). No. of bitstreams: 1 DISSERTAÇÃO_InfluênciaMineralogiaEtapa.pdf: 8356294 bytes, checksum: 8e302b4

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Chen, Zhao. "Bayesian and Empirical Bayes approaches to power law process and microarray analysis." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000430.

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Grosso, Andrea. "Tailing del Processo Bayer: analisi dell'alcalinità e studio del processo industriale di filtropressatura al fine di ridurne l'impatto ambientale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3912/.

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34

Eisenbarth, Thomas [Verfasser], and Bernhard [Akademischer Betreuer] Bauer. "Semantic Process Models: Transformation, Adaptation, Resource Consideration / Thomas Eisenbarth. Betreuer: Bernhard Bauer." Augsburg : Universität Augsburg, 2014. http://d-nb.info/1077703414/34.

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Hogan, Matthew Charles. "Process issues in redox biocatalysis : cyclohexanone monooxygenase catalysed chiral lactone syntheses." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325655.

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Hubbard, Rebecca Allana. "Modeling a non-homogeneous Markov process via time transformation /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/9607.

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Baier, Thomas [Verfasser], and Mathias [Akademischer Betreuer] Weske. "Matching events and activities : preprocessing event logs for process analysis / Thomas Baier ; Betreuer: Mathias Weske." Potsdam : Universität Potsdam, 2015. http://d-nb.info/1217939040/34.

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van, der Wilk Mark. "Sparse Gaussian process approximations and applications." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288347.

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Many tasks in machine learning require learning some kind of input-output relation (function), for example, recognising handwritten digits (from image to number) or learning the motion behaviour of a dynamical system like a pendulum (from positions and velocities now to future positions and velocities). We consider this problem using the Bayesian framework, where we use probability distributions to represent the state of uncertainty that a learning agent is in. In particular, we will investigate methods which use Gaussian processes to represent distributions over functions. Gaussian process mo

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Santos, Hugo Henrique Kegler dos. "Procedimentos sequenciais Bayesianos aplicados ao processo de captura-recaptura." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/4494.

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Made available in DSpace on 2016-06-02T20:04:52Z (GMT). No. of bitstreams: 1 6306.pdf: 1062380 bytes, checksum: de31a51e2d0a59e52556156a08c37b41 (MD5) Previous issue date: 2014-05-30<br>Financiadora de Estudos e Projetos<br>In this work, we make a study of the Bayes sequential decision procedure applied to capture-recapture with fixed sample sizes, to estimate the size of a finite and closed population process. We present the statistical model, review the Bayesian decision theory, presenting the pure decision problem, the statistical decision problem and the sequential decision procedure. We

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Ravet, Alexandre. "Introducing contextual awareness within the state estimation process : Bayes filters with context-dependent time-heterogeneous distributions." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0045/document.

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Ces travaux se focalisent sur une problématique fondamentale de la robotique autonome: l'estimation d'état. En effet, la plupart des approches actuelles permettant à un robot autonome de réaliser une tâche requièrent tout d'abord l'extraction d'une information d'état à partir de mesures capteurs bruitées. Ce vecteur d'état contient un ensemble de variables caractérisant le système à un instant t, comme la position du robot, sa vitesse, etc. En robotique comme dans de nombreux autres domaines, le filtrage bayésien est devenu la solution la plus populaire pour estimer l'état d'un système de faço

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Sun, Yaguang [Verfasser], and Bernhard [Akademischer Betreuer] Bauer. "Mining High-Quality Business Process Models from Real-Life Event Logs / Yaguang Sun ; Betreuer: Bernhard Bauer." Augsburg : Universität Augsburg, 2018. http://d-nb.info/115333903X/34.

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SOUZA, José Antônio da Silva. "Estudo e avaliação do uso de resíduos do processo Bayer como matéria-prima na produção de agregados sintéticos para a construção civil." Universidade Federal do Pará, 2010. http://repositorio.ufpa.br/jspui/handle/2011/4050.

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Submitted by Edisangela Bastos (edisangela@ufpa.br) on 2013-07-01T22:18:20Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Tese_EstudoAvaliacaoUso.pdf: 10721559 bytes, checksum: 776cb6f028a953bd6df65c698c045f19 (MD5)<br>Approved for entry into archive by Irvana Coutinho(irvana@ufpa.br) on 2013-07-02T12:44:39Z (GMT) No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Tese_EstudoAvaliacaoUso.pdf: 10721559 bytes, checksum: 776cb6f028a953bd6df65c698c045f19 (MD5)<br>Made available in DSpace on 2013-07-

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Gill, Hardeep. "The Effect of Aluminium Industry Effluents on Sediment Bacterial Communities." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23423.

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The goal of this project was to develop novel bacterial biomarkers for use in an industrial context. These biomarkers would be used to determine aluminium industry activity impact on a local ecosystem. Sediment bacterial communities of the Saguenay River are subjected to industrial effluent produced by industry in Jonquière, QC. In-situ responses of these communities to effluent exposure were measured and evaluated as potential biomarker candidates for exposure to past and present effluent discharge. Bacterial community structure and composition between control and affected sites were investig

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Costa, Eliardo Guimarães da. "Tamanho amostral para estimar a concentração de organismos em água de lastro: uma abordagem bayesiana." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-05072018-164225/.

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Metodologias para obtenção do tamanho amostral para estimar a concentração de organismos em água de lastro e verificar normas internacionais são desenvolvidas sob uma abordagem bayesiana. Consideramos os critérios da cobertura média, do tamanho médio e da minimização do custo total sob os modelos Poisson com distribuição a priori gama e binomial negativo com distribuição a priori Pearson Tipo VI. Além disso, consideramos um processo Dirichlet como distribuição a priori no modelo Poisson com o propósito de obter maior flexibilidade e robustez. Para fins de aplicação, implementamos rotinas compu

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Hwang, Beom Seuk. "Semiparametric Bayesian Joint Modeling with Applications in Toxicological Risk Assessment." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366327467.

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Do, Van-Cuong. "Analyse statistique de processus stochastiques : application sur des données d’orages." Thesis, Lorient, 2019. http://www.theses.fr/2019LORIS526/document.

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Les travaux présentés dans cette thèse concernent l'analyse statistique de cas particuliers du processus de Cox. Dans une première partie, nous proposons une synthèse des résultats existants sur le processus power-law (processus d'intensité puissance), synthèse qui ne peut être exhaustive étant donné la popularité de ce processus. Nous considérons une approche bayésienne pour l'inférence des paramètres de ce processus qui nous conduit à introduire et à étudier en détails une distribution que nous appelons loi H-B. Cette loi est une loi conjuguée. Nous proposons des stratégies d'élicitation des

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Santos, Evaldo Gondim dos. "O processo tornado vis?vel: metafic??o par?dica e narrativa policial em O Xang? de Baker Street." PROGRAMA DE P?S-GRADUA??O EM ESTUDOS DA LINGUAGEM, 2016. https://repositorio.ufrn.br/jspui/handle/123456789/22676.

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Solmi, Stefania. "Studio di nuovi processi catalitici per la sintesi di acido adipico." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5740/.

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L’acido adipico (AA) è un importante intermedio chimico prodotto in quantità pari a circa tre milioni di tonnellate annue, i cui usi riguardano principalmente la produzione di Nylon-6,6. Tutti i processi industriali odierni per la produzione dell’AA hanno in comune lo stadio finale di ossidazione con acido nitrico dell’ultimo intermedio di sintesi, che in genere è una miscela di cicloesanolo e cicloesanone (KA Oil). Esistono diversi problemi riguardanti questo processo, come la pericolosità che deriva dall’uso di acido nitrico concentrato. Dal punto di vista ambientale, il problema principale

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Bakhtiari, Koohsorkhi Alireza. "Analysis of the Dirichlet Process Mixture Model with Application to Dialogue Act Classification." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28503/28503.pdf.

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La reconnaissance des intentions de l’utilisateur est l’un des problèmes les plus difficiles dans la conception des systèmes de dialogues. Ces intentions sont généralement codés en termes d’actes de dialogue, où un rôle fonctionnel est attribué à chaque énoncé d’une conversation. L’annotation manuelle des actes de dialogue est généralement coûteuse et prends du temps, il y a donc un grand intérêt à plutôt annoter automatiquement des corpus de dialogue. Dans ce mémoire, nous proposons une approche non paramétrique bayésienne pour

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Yin, Jiani. "Bayesian Nonparametric Models for Multi-Stage Sample Surveys." Digital WPI, 2016. https://digitalcommons.wpi.edu/etd-dissertations/197.

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It is a standard practice in small area estimation (SAE) to use a model-based approach to borrow information from neighboring areas or from areas with similar characteristics. However, survey data tend to have gaps, ties and outliers, and parametric models may be problematic because statistical inference is sensitive to parametric assumptions. We propose nonparametric hierarchical Bayesian models for multi-stage finite population sampling to robustify the inference and allow for heterogeneity, outliers, skewness, etc. Bayesian predictive inference for SAE is studied by embedding a parametric

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