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Dissertations / Theses on the topic 'Aerosol density'

Author: Grafiati

Published: 4 June 2021

Last updated: 29 January 2023

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1

Wang, Shuo. "Retrieval of Aerosol Chemical Composition based on aerosol optical properties." Thesis, Littoral, 2020. https://tel.archives-ouvertes.fr/tel-03178823.

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La composition chimique des aérosols permet de mieux comprendre leurs interactions avec le changement climatique et la santé humaine. La composition chimique des aérosols est étroitement liée aux propriétés optiques. Actuellement, les propriétés optiques des aérosols sont mesurées, intégrées ou non sur la colonne atmosphérique, à une échelle globale. Le développement d'algorithmes permettant de déterminer, à une résolution spatiale et temporelle élevée, la composition chimique des aérosols à partir de leurs propriétés optiques est essentiel. Ce travail de thèse vise à tester et à améliorer les

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2

Gilbertson, Sarah Elizabeth. "Aerosol Gel production via controlled detonation of liquid precursors." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/1101.

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3

Cross, Eben Spencer. "Sources and transformations of atmospheric aerosol particles." Thesis, Boston College, 2008. http://hdl.handle.net/2345/971.

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Thesis advisor: Paul Davidovits<br>Aerosol particles are an important component of the Earth-Atmosphere system because of their influence on the radiation budget both directly (through absorption and scattering) and indirectly (through cloud condensation nuclei (CCN) activity). The magnitude of the raditaive forcing attributed to the direct and indirect aerosol effects is highly uncertain, leading to large uncertainties in projections of global climate change. Real-time measurements of aerosol properties are a critical step toward constraining the uncertainties in current global climate modeli

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4

Lim, Tongli. "Fabrication of high energy density tin/carbon anode using reduction expansion synthesis and aerosol through plasma techniques." Thesis, Monterey, California: Naval Postgraduate School, 2017. http://hdl.handle.net/10945/53011.

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Approved for public release; distribution is unlimited<br>The aim of this study was to fabricate tin/carbon (Sn/C) battery anodes using a novel approach, reduction expansion synthesis (RES), and test their performance as electrodes in lithium or sodium batteries. A second preparation route, the Aerosol-Through-Plasma (ATP) method, was also employed for comparison. The specimens generated were characterized, before and after cycling, using techniques such as X-ray diffraction, scanning, and transmission electron microscopy. The RES technique was successful in creating remarkably small (ca. <5 n

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5

Johnson, Graham Richard. "The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16117/1/Graham_Johnson_Thesis.pdf.

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Marine aerosols have attracted increasing attention over the past 15 years because of their potential significance for global climate modelling. The size distribution of these aerosols extends from super-micrometer sea salt mode particles down through 150 nm accumulation mode particles, 40 nm Aitken mode particles and nucleation mode particles which extend from 25 nm right down to clusters of a few molecules. The process by which the submicrometer modes form and grow and their composition have remained topics of debate throughout this time in large part because of the diff

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6

Johnson, Graham Richard. "The Formation and Growth of Marine Aerosols and the Development of New Techniques for their In-situ Analysis." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16117/.

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Marine aerosols have attracted increasing attention over the past 15 years because of their potential significance for global climate modelling. The size distribution of these aerosols extends from super-micrometer sea salt mode particles down through 150 nm accumulation mode particles, 40 nm Aitken mode particles and nucleation mode particles which extend from 25 nm right down to clusters of a few molecules. The process by which the submicrometer modes form and grow and their composition have remained topics of debate throughout this time in large part because of the difficulties assoc

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7

Gawryla, Matthew Daniel. "Low Density Materials through Freeze-Drying:Clay Aerogels and Beyond…" Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1247013426.

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8

Lau, Bobby Wing Shun. "A complete model of the infrared dielectric function of a low-density silica aerogel /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.

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9

Ekström, Alexander, Olof Gustafsson, Anders Kvarned, et al. "Mechanical properties dependence on microstructure in aerogel-like Quartzene®." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226525.

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In this project the relation between pore size/porosity and the mechanical properties has been studied in the aerogel-like material Quartzene®. Quartzene® is a patented material produced by Svenska Aerogel AB. Density measurements were made on three different types of Svenska Aerogels ABs Quartzene® in the shape of pellets.These three types of Quartzene® is called CMS, ND and E9. The mechanical properties were studied by doing diametrical crush-tests on the pellets. Afterwards the samples were examined through SEM in order to study the structural properties like porosity and microstructure. By

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10

Jadon, Ankita. "Interactions between sodium carbonate aerosols and iodine fission-products." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1R021/document.

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L’analyse de sûreté des réacteurs à neutrons rapides refroidis au sodium de Génération IV nécessite l'étude des conséquences d'un accident grave en cas de rejet dans l'environnement du sodium et des radionucléides qu'il transporte (terme source chimique et radiologique). Le terme source global dépend donc à la fois de la spéciation chimique des aérosols de sodium, issus de la combustion du sodium dans l'enceinte, et de leurs interactions avec les radionucléides. Au cours de cette thèse, les interactions entre le carbonate de sodium et les produits de fission gazeux iodés (I2 et HI) ont été étu

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11

Bamford, Erik, Gustav Ek, Daniel Hedbom, et al. "Quartzene – A promising thermal insulator : Studies of thermal conductivity’s dependence of density and compression of Quartzene® in the form of powder." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-228087.

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The purpose of this project was to study Svenska Aerogel AB’s product Quartzene®, and develop its capacity as a thermal insulator. Quartzene® is a silica based mesoporous material developed by Svenska Aerogel AB, with properties similar to aerogels produced by the sol-gel process. In this report, the correlation between pore structure and thermal conductivity in the material has been studied using techniques, such as scanning electron microscopy, focused ion beam, finite element simulations and transient plane source. Its properties are interesting because of the expanding market of insulated

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12

Bouaniche, Alexandre. "A hybrid stochastic-sectional method for the simulation of soot particle size distributions Vitiated high karlovitz n-decane/air turbulent flames: scaling laws and micro-mixing modeling analysis A hybrid stochastic/fixed-sectional method for solving the population balance equation." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR23.

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Les particules de suie (qui sont un type de particules ultrafines) peuvent être produites et émises dans des conditions de combustion riche. Les secteurs comme les transports (routier et aérien), où l'industrie sont des contributeurs significatifs aux émissions de particules. Celles-ci sont habituellement considérées comme des polluants dans la mesure où leur impact négatif sur la santé a été mesuré. Dans certains cas spécifiques comme la production de nanomatériaux, elles peuvent être synthétisées de manière volontaire. Dans les deux cas, une compréhension précise et une capabilité de prédict

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13

Groult, Sophie. "Les aérogels de pectine : matériaux avancés pour l'isolation thermique et la libération de médicaments." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM016/document.

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Les aérogels sont des matériaux nano-structurés ultralégers, hautement poreux et présentant une surface spécifique élevée. Les bio-aérogels sont une nouvelle génération d'aérogels entièrement bio-sourcés, offrant de ce fait de grands potentiels pour des applications à l’interface avec le vivant tout en valorisant la biomasse. Dans le cadre de cette thèse, la pectine a été utilisée pour produire des bio-aérogels. Deux principaux objectifs ont été atteints : • Le premier était de déterminer et de maîtriser les corrélations existantes entre les caractéristiques de la pectine et les conditions de

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14

Hiron, Thibault. "Experimental and modeling study of heterogeneous ice nucleation on mineral aerosol particles and its impact on a convective cloud." Thesis, Université Clermont Auvergne‎ (2017-2020), 2017. http://www.theses.fr/2017CLFAC074/document.

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L’un des enjeux principaux dans l’appréhension de l’évolution du climat planétaire réside dans la compréhension du rôle des processus de formation de la glace ainsi que leur rôle dans la formation et l’évolution des nuages troposphériques. Un cold stage nouvellement construit permet l’observation simultanée de jusqu’à 200 gouttes monodispersées de suspensions contenant des particules de K–feldspath, connues comme étant des particules glaçogènes très actives. Les propriétés glaçogènes des particules résiduelles de chaque goutte sont ensuite comparées pour les différents modes de glaciation et l

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15

Gabay, Claude. "Transitions de phases de l'hélium dans les aérogels de silice." Université Joseph Fourier (Grenoble), 2001. http://www.theses.fr/2001GRE10067.

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Ce travail experimental est une contribution a l'etude de deux phenomenes critiques de l'helium dans les aerogels de silice. Dans le but de detecter d'eventuels changements de classe d'universalite du point critique liquide-gaz pour l'helium adsorbe dans les aergels, nous avons developpe un capteur de densite original constitue d'un pendule simple dont la masse est celle de l'aerogel et de l'helium qu'il contient. Ce dispositif a ete valide en etudiant, pour sept echantillons differents, l'apparition de la superfluidite de l'helium. Des resultats connus ont ete ainsi reproduits, et nous apport

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16

Félix, Vincent. "Caractérisation thermique de matériaux isolants légers. Application à des aérogels de faible poids moléculaire." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL095N/document.

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La problématique de la sauvegarde de l’énergie pose un certain nombre de défis à la science, en particulier celui de son efficacité. La conception et la caractérisation de nouveaux matériaux isolants thermiques plus performants se révèlent donc fondamentales dans cette perspective. Les aérogels se présentent comme de sérieux candidats dans ce domaine, leur procédé de fabrication confère à certains d’entre eux des caractéristiques extrêmes telles qu’une grande porosité et une faible masse volumique. La caractérisation thermique de tels matériaux est délicate, leur faible sensibilité aux flux th

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17

Κωστενίδου, Ευαγγελία. "Usage of aerosol mass spectrometry for the measurement of the physical and chemical properties of the atmospheric nanoparticles." Thesis, 2010. http://nemertes.lis.upatras.gr/jspui/handle/10889/3343.

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The Aerosol Mass Spectroscopy (AMS) is a recently developed method that provides on-line measurements of the chemical composition, mass spectrum and mass distributions of the atmospheric aerosol. Using the AMS with a thermodenuder in smog chamber experiments of ozonolysis of α-pinene, β-pinene and limonene, the mass spectrum of the secondary organic aerosols (SOA) is deconvoluted in low, medium and high volatility mass spectra. The spectrum of the surrogate component with the lower volatility for α-pinene and β-pinene is quite similar to that of ambient oxygenated organic aerosol (OOA). This c

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18

Πικριδάς, Μιχαήλ. "Characterization and sources of atmospheric particles in different population density environments." Thesis, 2012. http://hdl.handle.net/10889/6474.

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In order to reduce uncertainty of atmospheric particle emissions and to examine the mechanism of new particle formation from precursor gases, measurements were conducted in a megacity (Paris, France), an urban area (Patras, Greece) and a remote location (Finokalia, Greece). At Finokalia, the composition of particles with diameter smaller than 1 μm (PM1) depended on air mass origin. The highest concentrations, and most frequent, were observed when air masses were coming from Europe. Organic aerosol was found to be 80% water soluble and the increased organic to elemental carbon ratio correlated

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19

Grätz, Olga. "Preparation and in-situ Spectroscopic Characterization of High-Energy Density Lithium-Sulphur Batteries." 2019. https://tud.qucosa.de/id/qucosa%3A70984.

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This work was composed of two main parts. In a first step, a electrochemical cell was developed, which could allow the in-situ, in-operando analysis of the functioning battery. The processes taking place inside a running lithium-sulphur cell were then observed and identified with the help of Raman spectroscopy. In a second step, the performance of the cell was studied while using novel cathode materials, as well as modified commercial separators.

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