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Dissertations / Theses on the topic 'Pollutant mixture'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

GASTALDI, PATRICK. "INFLUENCE OF THE MIXTURE PREPARATION ON THE COMBUSTION IN DIRECT INJECTION ENGINES." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/48534.

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During the last two centuries, the development of the internal combustion engine has followed the evolution of the customer expectations. From the race for pure performances, high power, and fun to drive, perfectly well illustrated by the fabulous Mercedes 300 SL, the focus moved towards fuel efficient engines under the pressure of the still increasing oil prices. The well-known Diesel powertrain, up to this period limited to industrial vehicles, suddenly became the object of many researches, even for automotive manufacturers, specialists for sport cars. Technologic developments, mainly

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2

Maio, Giampaolo. "Pollutant prediction in numerical simulations of laminar and turbulent flames using virtual chemistry." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASC003.

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La CFD est aujourd’hui utilisée par les ingénieurs de recherche comme un outil numérique pour concevoir et optimiser les dispositifs de combustion avancés qui sont utilisés dans les systèmes de conversion d’énergie. L’un des principaux objectifs de la recherche, dans le développement d’outils numériques avancés pour la CFD, est l’identification d’un modèle réduite de cinitique chimique de la combustion qui reproduit la structure de la flamme et la formation de polluants avec un coût de calcul abordable. En particulier, la prédiction de la formation de polluants est une tâche difficile lorsque

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3

Saunier, Elise. "Impact des xénobiotiques sur la progression tumorale des cellules cancéreuses humaines." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCB148.

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L’impact de l’environnement dans le développement de certaines pathologies est avéré bien qu’il soit difficile à évaluer. L’Homme est chroniquement exposé à des cocktails de xénobiotiques -des molécules étrangères à l’organisme- dont la nature, la concentration et les interactions sont variables avec des effets néfastes ou bénéfiques pour la santé humaine. Parmi ceux-ci, les polluants environnementaux jouent un rôle non négligeable dans l’apparition de certains cancers. Au contraire, des molécules naturelles comme le resvératrol, possède des propriétés anti-cancéreuses. Au cours de la cancérog

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4

Pak, Sun. "Adaptation, combustion et limites pauvres d'un moteur à allumage commandé au gaz naturel obtenu par conversion d'un diesel faible puissance." Valenciennes, 1994. https://ged.uphf.fr/nuxeo/site/esupversions/1d663861-db36-4829-9d80-aa7826a05ebe.

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Un moteur diesel faible puissance a était converti en A. C. Puis alimenté au gaz naturel. Les caractéristiques générales de la combustion (délais, durées de combustion, dispersion cyclique) ont été étudiées en fonction du rapport air-gaz, de l'avance à l'allumage, et du type de bougie ainsi que les performances du moteur. Pour le comportement en mélange très pauvre, nous avons déterminé les limites opératoires, analyse le déroulement de la combustion et observe les variations de pression. En utilisant un générateur de turbulence en forme de cône, nous avons reculé les limites pauvres et réduit

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5

Morris, Kenneth Robert 1951. "THE SOLUBILITY OF HYDROPHOBIC POLLUTANTS IN WATER-COSOLVENT MIXTURES." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/276659.

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6

Santos, Helton Saulo Bezerra dos. "Essays on Birnbaum-Saunders models." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/87375.

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Nessa tese apresentamos três diferentes aplicações dos modelos Birnbaum-Saunders. No capítulo 2 introduzimos um novo método por função-núcleo não-paramétrico para a estimação de densidades assimétricas, baseado nas distribuições Birnbaum-Saunders generalizadas assimétricas. Funções-núcleo baseadas nessas distribuições têm a vantagem de fornecer flexibilidade nos níveis de assimetria e curtose. Em adição, os estimadores da densidade por função-núcleo Birnbaum-Saunders gene-ralizadas assimétricas são livres de viés na fronteira e alcançam a taxa ótima de convergência para o erro quadrático integ

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7

Astanei, Dragoş-George. "Improving the performances of the combustion engines by improving the ignition system." Thesis, Orléans, 2014. http://www.theses.fr/2014ORLE2073/document.

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Face aux normes actuelles et futures, de plus en plus drastiques, concernant les émissions de polluants, les constructeurs automobiles cherchent en permanence à améliorer l'efficacité des moteurs à allumage commandé. Une des solutions les plus efficaces et applicables pour diminuer la quantité de polluants émis dans les gaz d’échappement (HC, CO, NOx) et réduire la consommation de carburant, est d’utiliser un mélange très pauvre (richesse du mélange inférieure à 0,6). Toutefois, ce concept de fonctionnement est limité par les systèmes d'allumage classiques qui ne peuvent pas garantir un alluma

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8

Rydholm, Fredrik. "Sorption of Stormwater Pollutants for Five Material Mixtures: A batch Equlibrium Study." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86150.

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Blue-green infrastructure have been more lucrative during the last 30 years, since urbanizationbrings more impervious surfaces that increases stormwater runoff volumes. Amongst thedifferent blue-green infrastructures there are e.g., constructed wetlands and swales. Blue-greeninfrastructure means more natural management of the stormwater, such as infiltration. Forinfiltration of water, the hydraulic conductivity is an important parameter, but also the abilityto remove dissolved pollutants. In literature, various studies of filter materials are only testedfor single dissolved pollutants, which m

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9

DI, NATALE Marilena Vita. "Impacts of weathered microplastics on bioavailability of pollutants in Paracentrotus lividus and Danio rerio: molecular and ecotoxicological approaches." Doctoral thesis, Università degli Studi di Palermo, 2022. https://hdl.handle.net/10447/560342.

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Plastic materials provide countless applications in every sector of human life, from food and health preservation to textiles and electronics industry (Cole et al., 2011;Thompson et al., 2009) which is resulting in huge amount of plastic waste. Recently, it was estimated that plastics account for the 80-90% of the whole marine litter (Derraik, 2002) and over 5 trillion microscopic plastic fragments are floating on the surface of the World Oceans (Eriksen et al., 2014). The predominant form of marine plastic litter is called “Microplastics (MPs)", terminology by Thompson et al. 2004, used to

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10

Jeong, Hyon Sun. "Effects of Persistent Organic Pollutants and Their Mixtures on Biotransformation and Oxidative Stress in Zebrafish Embryo." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-52495.

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Persistent organic pollutants (POPs) cause significant effects on organisms due to their resistance to environmental degradation and specific toxic responses. Although POPs toxicities were linked to oxidative stress in the previous studies, there are few POPs studies that link them with oxidative stress in zebrafish during development. Aim of this study is to investigate effect of selected POPs on expression of genes involved in oxidative stress response and biotransformation of xenobiotics in zebrafish. Zebrafish embryos in 96 hours’ post-fertilization were exposed to selected POPs and their

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11

DJOKO-SURONO-WIDODO, JOHANNES. "Etude de la combustion d'un moteur a allumage commande par controle de la turbulence externe." Paris 6, 1986. http://www.theses.fr/1986PA066631.

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Etude de la combustion en melange pauvre avec rotation de la charge. Presentation des solutions pour limiter les effets defavorables: conduit d'admission helicoidal, canal d'admission secondaire, deflecteur mobile pilote, culasse multi-admissions (permeabilite de la culasse). L'augmentation de la turbulence donne des resultats positifs pour les points de fonctionnement a faible charge

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12

Thrupp, Tara Joanne. "Effects of pharmaceutical pollutants and their mixtures on aquatic organisms, with particular focus on reproduction and endocrine function in a fish model species." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/14395.

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A number of pharmaceuticals have been shown to have adverse effects on key biological processes of aquatic organisms at low concentrations (ng/l range). Key questions for chemical risk assessment are whether such pharmaceuticals can produce adverse effects on organisms when present in the environment in combination and at low concentrations, whether these can be classified as additive, and under what circumstances can they be predicted. The main purpose of this study was to assess the potential for combination effects of a multicomponent steroid pharmaceutical mixture of dissimilarly acting co

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13

Calisesi, Federico. "The analysis of the injection of hydrogen-oxygen mixtures in gasoline-powered internal combustion engines." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15553/.

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The effects on combustion derived by the blending of hydrogen with traditional fuels adopted for internal combustion engines have been studied. Results derived by emission tests of a gasoline-fed vehicle equipped with a system for the production of hydrogen on-board have been analysed. The energy balance for the engine was evaluated. It demonstrated the increase of fuel consumptions to perform electrolysis process on-board the vehicle. Afterwards, numerical simulations based on a detailed kinetic model have been performed to calculate pollutant emissions produced by methane and iso-octane (whi

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14

Copani, Giuseppe. "Benefit of including bioactive legumes (sainfoin, red clover) in grass-based silages on ruminant production and pollutant emissions." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22594/document.

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Les légumineuses permettent de réduire les intrants en élevage (engrais, concentrés) en raison notamment de leurs niveaux élevés en protéines. Cependant, à la fois pendant le processus d'ensilage et celui de fermentation dans le rumen, les protéines peuvent subir une importante dégradation, ce qui affecte la valeur nutritive des fourrages et induit des rejets d'azote (N) importants, notamment dans l'urine. Certaines légumineuses peuvent alors être d'un intérêt particulier car elles produisent des composés secondaires qui peuvent modifier positivement les processus fermentaires et digestifs. Ai

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15

Lee, Iwa. "Developmental neurotoxicity of persistent and non-persistent pollutants : Behavioral and neurochemical assessments of a perfluorinated compound, pesticides and interaction effects." Doctoral thesis, Uppsala universitet, Institutionen för organismbiologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-261742.

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The focus of this thesis was to investigate developmental neurotoxic effects of different persistent and non-persistent environmental pollutants, alone or in binary mixtures, when exposure occurs during a critical period of brain development, in mice. The compounds investigated included a perfluorinated compound, perfluorohexane sulphonate (PFHxS), and four different pesticides, endosulfan, cypermethrin, chlorpyrifos and carbaryl. Both persistent and non-persistent pollutants are detected in the environment and in humans, which shows that exposure to these compounds is occurring in real life.

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16

Meinert, Cornelia [Verfasser], W. G. [Akademischer Betreuer] Lorenz, and U. J. [Akademischer Betreuer] Meierhenrich. "Isolation and identification of environmental pollutants from complex mixtures using effect-directed analysis and preparative capillary gas chromatography / Cornelia Meinert. Betreuer: W. G. Lorenz ; U. J. Meierhenrich." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2011. http://d-nb.info/1025134710/34.

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17

Perrière, Clémentine. "Effets d’un mélange de polluants organiques persistants sur le métabolisme énergétique de cellules cancéreuses coliques humaines." Thesis, Paris 5, 2013. http://www.theses.fr/2013PA05P629.

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L’être humain est exposé quotidiennement et simultanément à des dizaines de polluants environnementaux, pourtant il n’existe encore que peu ou pas d’études sur les effets de ces mélanges. Des études épidémiologiques et transcriptomiques montrent que les polluants peuvent perturber le métabolisme glucidique et lipidique. Le lien entre métabolisme et cancer a été démontré depuis plusieurs décennies, en effet, une dérégulation du métabolisme oxydatif, appelée effet Warburg, et commune à presque toutes les cellules tumorales se caractérise par une déviation du métabolisme oxydatif mitochondrial ve

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18

Giampiccolo, Camille. "Exposition chronique et combinée à de multiples polluants de l’air et risque de cancer du sein dans la cohorte E3N : application d’approches statistiques multi-expositions." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10313.

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La pollution atmosphérique est un mélange complexe de plusieurs polluants fortement corrélés, dont la composition varie à la fois dans l’espace et dans le temps. Classée cancérogène par le CIRC, cette pollution est suspectée d’être associée à un risque positif de cancer du sein, la première cause de décès par cancer chez les femmes. Cependant, les méthodes épidémiologiques classiques ne permettent pas d’isoler les effets spécifiques de chaque polluant en raison des fortes corrélations entre les différentes variables d’exposition, ni d’évaluer l’impact combiné de l’exposition à plusieurs pollua

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19

Maximino, Mateus Dassie [UNESP]. "Interação entre modelos de membrana biológica e poluentes emergentes." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153668.

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Submitted by Mateus Dassie Maximino (mateusmaximino23@gmail.com) on 2018-04-23T13:55:51Z No. of bitstreams: 1 Dissertação Mestrado - Mateus Dassie Maximino.pdf: 5933036 bytes, checksum: 96040f746ca01578e5036f01f3d89e6e (MD5)<br>Approved for entry into archive by Claudia Adriana Spindola null (claudia@fct.unesp.br) on 2018-04-23T14:37:07Z (GMT) No. of bitstreams: 1 maximino_md_me_prud.pdf: 5933036 bytes, checksum: 96040f746ca01578e5036f01f3d89e6e (MD5)<br>Made available in DSpace on 2018-04-23T14:37:07Z (GMT). No. of bitstreams: 1 maximino_md_me_prud.pdf: 5933036 bytes, checksum: 96040f746c

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Pauly, Guacira de Figueiredo Eufrasio. "Avaliação da toxicidade de misturas : Irgarol e contaminantes ambientais comumente observados em áreas costeiras /." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153195.

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Submitted by Guacira de Figueiredo Eufrasio Pauly null (guafe@yahoo.com.br) on 2018-03-22T19:42:28Z No. of bitstreams: 1 Avaliação da toxicidade de misturas Irgarol e contaminantes ambientais comumente observados em áreas costeiras.pdf: 1773405 bytes, checksum: d022473735b82f51e6340d000b00e009 (MD5)<br>Approved for entry into archive by Disleide Silvia Valerio Gounella null (disleide@clp.unesp.br) on 2018-03-23T18:54:19Z (GMT) No. of bitstreams: 1 pauly_gfe_me_svic.pdf: 1773405 bytes, checksum: d022473735b82f51e6340d000b00e009 (MD5)<br>Made available in DSpace on 2018-03-23T18:54:19Z (GMT).

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21

Chang, Chiung-Wen, and 張瓊文. "DFT-based Quantitative Structure-Activity Relationships for Predicting Mixture Toxicity of Organic Pollutants." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/67143286880275813739.

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碩士<br>國立中興大學<br>土壤環境科學系所<br>97<br>The environment is often exposed to chemical mixtures from multiple sources. The toxicity of various chemical mixtures is higher than single chemicals. However, the vast majority of toxicity studies deal with single chemicals, and therefore the prediction of mixture toxicity becomes a necessary and vital issue. In recent years, the development of quantum mechanical theory was combined with the progress of computational technology, which means quantitative calculation can be conducted from the atomic or molecular structure of a substance with little or even wit

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22

Santos, Daniela Filipa Martins. "Combustion of CH4, H2, and CH4 -H2 Mixtures in a Gas Turbine Can Combustor." Master's thesis, 2014. http://hdl.handle.net/10400.6/6451.

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The fact that there is an increase in the price of fossil fuels, and that environmental changes are occurring due to pollutant emissions, makes it imperative to find alternative fuels that are less polluting and cheaper. Gas turbines have been particularly developed as aviation engines, but nowadays they can find applicability in many areas and the fact that they have multiple fuel applications, makes them a very important subject of study. The main objective of this dissertation is to evaluate through a CFD analysis on FLUENT the performance of the combustion in a gas turbine can combustor, f

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23

Cherng, Shur-Hueih, and 程淑慧. "(1) Alteration of Benzo[a]pyrene-Induced Cytochrome P450 1A1 Gene Expression by Benzo[g,h,i]perylene or 1-Nitropyrene in Binary Mixtures of Mimic Environmental Pollutants (2) Induction of OGG1 Gene Expression as an Exposure Biomarker of Cooking Oil Fumes." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/43257283097405711032.

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博士<br>國立清華大學<br>生命科學系<br>90<br>Alteration of benzo[a]pyrene-induced cytochrome P450 1A1 gene expression by benzo[g,h,i]perylene or 1-nitropyrene in binary mixtures of mimic environmental pollutants Benzo[a]pyrene (BaP), benzo[g,h,i]perylene (BghiP) and 1-nitropyrene (1-NP) are all widespread environmental pollutants. BaP is thought to be a probable carcinogen in human cancer. Numerous studies have shown that BaP-induced carcinogenesis in rodents can be attenuated or gained by certain chemicals. However, the detailed molecular mechanisms through which these complex mixtures alter che

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