Дисертації з теми "Interacting sprays"
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Mirza, Muhammad Riaz. "Studies of diesel sprays interacting with cross-flows and solid boundaries." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315666.
Повний текст джерелаJones, Alwyn. "The interaction of flames with water sprays." Thesis, Cardiff University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338152.
Повний текст джерелаPawlowski, Adam. "Experimental investigation of interaction process between diesel sprays." Aachen Shaker, 2008. http://d-nb.info/992707420/04.
Повний текст джерелаCutter, Paul. "Diesel spray characteristics, spray/wall interaction and heat transfer." Thesis, Imperial College London, 1996. http://hdl.handle.net/10044/1/7524.
Повний текст джерелаJones, Stephen Huw Meredith. "Interaction of detonation waves with foils and water sprays." Thesis, Cardiff University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255842.
Повний текст джерелаJackman, L. A. "Sprinkler spray interactions with fire gases." Thesis, London South Bank University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.482025.
Повний текст джерелаPawlowski, Adam [Verfasser]. "Experimental Investigation of Interaction Processes Between Diesel-Sprays / Adam Pawlowski." Aachen : Shaker, 2009. http://d-nb.info/116131105X/34.
Повний текст джерелаPalumbo, John C., F. J. Reyes, L. Carey, A. Amaya, and L. Ledesma. "Interactions Between Insecticides, Spray pH, & Adjuvants." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2001. http://hdl.handle.net/10150/214912.
Повний текст джерелаDeprédurand, Valérie. "Approche expérimentale de l'évaporation de sprays de combustibles multicomposant." Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL060N/document.
Повний текст джерелаNon intrusive optical diagnostics are used in order to investigate the mechanisms that govern the droplets evaporation. A new technique based on 2-colours laser-induced fluorescence (LIF) of the pyrromethene 597-8C9 was developed to obtain the mean temperature of evaporating bicomponent fuel droplets in a linear monodisperse droplet stream. In parallel size evolution of the droplet was measured thanks to forward scattering methods. Data on evaporating and interacting droplet streaming linearly have been collected for different injection parameters and several monocomponent fuels (alcohol, ketones, alkanes) that exhibit different volatilities and bicomponent fuels (mixture of n-decane and 3-pentanone), in a temperature controlled evaporation chamber. Heat and mass transfers parameters (Nusselt and Sherwood numbers) involved in the evaporation process of interacting droplets are inferred from the experimental data. The result exhibits a strong influence of the volatilities of the fuel on the effect of the interaction on heat and mass transfers. Then the 2-colours LIF technique was extended to measure the mean temperature within a spray made of bicomponent droplets (n-decane / 3-pentanone), injected in a hot air flow where the turbulence and boundary conditions are controlled. By means of a coupling with the PDA (Particle Dynamic Analyser), temperature for each size of droplets was determined
Sibra, Alaric. "Modélisation et étude de l’évaporation et de la combustion de gouttes dans les moteurs à propergol solide par une approche eulérienne Multi-Fluide." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLC019/document.
Повний текст джерелаThe addition of a significant mass fraction of aluminum particle in the propellant of Solid Rocket Motors improves performance through an increase of the temperature in the combustion chamber. The distributed combustion of aluminum droplets in a portion of the chamber yields a massive amount of disperse aluminum oxide residues with a large size spectrum, called a polydisperse spray, in the entire volume. The spray can have a significant impact on the motor behavior and in particular on the onset/damping of instability. When dealing with aeroacoustical and thermoacoustical instabilities, the faithful prediction of the interactions between the gaseous phase and the spray is a determining step for understanding the physical mechanisms and for future solid rocket motor optimization. In such a harsh environment, experimental measurements have a hard time providing detailed explanation of the physical mechanisms and one has to resort to numerical simulation. For such a purpose, the distributed combustion zone and thermal profile therein, the heat generated by the combustion of the dispersed droplets and the large size distribution of the aluminum oxide residues and its coupling with he gaseous phase hydrodynamic and acoustic fields have to be accurately reproduced through a proper level of modeling and a high fidelity simulation including a precise resolution of size polydispersity, which is a key parameter.In this contribution, we choose a kinetic approach for the description of polydisperse sprays. The Williams-Boltzmann Equation is used to model the disperse phase and we derive a fully Eulerian approach through moment methods. The Multi-Fluid (MF) methods naturally treat droplet size evolution through phenomena such as evaporation and coalescence. These methods rely on the conservation of size moments on fixed intervals called sections and yield systems of conservation laws for a set of "fluids" of droplet of various sizes, which is strongly coupled with the gas phase via source terms. We derive a new optimal and flexible Two Size Moment MF method based on a family of polynomial reconstruction functions to describe the size distribution in the sections, which is second order accurate and particularly efficient at describing accurately the evolution of the size distribution with a moderate number of sections. An original work is also conducted in order to extend this approach to two-component droplets. For size moment MF methods, realizability of the moments is a crucial issue. Thus, we have developed innovative schemes for integrating source terms in moment conservation equations describing transport in phase space. This method enables the use of more representative aluminum droplet combustion models, and leads to more advanced studies of the distributed combustion zone. Moreover, for unsteady two-phase flow simulations, we have developed a robust and accurate coupling strategy between phases that are modeled by a fully Eulerian approach based on operator splitting in order to treat such spatial and temporal very multi-scale problems with reasonable computational time. All the proposed developments have been carried out following two criteria : 1- an attractive cost/accuracy ratio for industrial simulations in the context of high fidelity simulations 2- a preservation of industrial code legacy. Verification of the models and methods have been conducted first using an in-house reseach code and then in the context of a two-phase acoustic study thus emphasizing the relevance of the splitting technique to capture accurately spray-acoustic interactions
Al-obaidi, Hisham Kadhim Hashim. "Optimization of Drug Carrier Interactions in Spray Dried Solid Dispersions." Thesis, University College London (University of London), 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498574.
Повний текст джерелаKuhnke, Dominik [Verfasser]. "Spray/Wall-Interaction Modelling by Dimensionless Data Analysis / Dominik Kuhnke." Aachen : Shaker, 2004. http://d-nb.info/1186574682/34.
Повний текст джерелаMühlbauer, Monika. "Modelling wall interactions of a high-pressure, hollow cone spray /." Aachen : Shaker, 2009. http://d-nb.info/998456616/04.
Повний текст джерелаLi, Tingwen. "Numerical investigation of the gas/spray jet interaction with fluidized beds." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/6049.
Повний текст джерелаBerti, Rafael da Cruz Ribeiro. "Interaction of turbulent structures with ethanol sprays in mixture formation processes in a constant-flow chamber." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3150/tde-19092018-082453/.
Повний текст джерелаO estudo da formação e evolução dos sprays é essencial para o desenvolvimento de modelos físicos mais detalhados e novas estratégias de injeção para motores de combustão interna de injeção direta. No presente trabalho, os sprays de um injetor multi-furos são avaliados em um esforço para caracterizar os efeitos do desenvolvimento do spray em fluxo de ar constante. Estas interações são estudadas em termos de características de turbulência do ar,do fluxo mássico de ar e da pressão de injeção de combustível. Sprays de etanol são injetados em uma câmara de fluxo constante. O objetivo do aparato é isolar o experimento de propriedades do escoamento intrínsecas ao funcionamento de motores de combustão interna, tais como instabilidades e geometrias móveis. Os fatores que afetam as interações de arspray foram avaliados com os campos de velocidade do ar obtidos na presença de spray. A técnica de velocimetria por imagem de partículas de duas fases foi aprimorada para permitir a medição nas condições experimentais. Em todas as condições, a interação é baseada em um diferencial de pressão formado entre as regiões interna e externa do spray. Os resultados indicam um mecanismo diferente quando comparado com condições quiescentes. O vortex formado na fronteira do spray é observado apenas nos estágios iniciais de injeção. No entanto, o transiente de fim de injeção ainda está presente para essas condições. O mecanismo de interação acelera as distribuições de velocidade em direção à fronteira do jato. Os experimentos indicam que o aumento do fluxo de massa de ar modifica a velocidade de penetração do ar, mas sem alterar as características do mecanismo de interação. Distribuições de intensidade turbulenta são calculadas para o fluxo de ar durante o evento de injeção. As distribuições indicam que os sprays atenuam a intensidade turbulenta em todas as condições, consistente com as observações dos campos de velocidade. Para avaliar os efeitos da turbulência do ar, conjuntos de placas perfuradas intercambiáveis são utilizadas para limitar as escalas integrais de turbulência. As análises do espectrograma indicam que a turbulência é reduzida não apenas nas escalas integrais, mas também em todas as escalas de freqüência medidas. Estas escalas integrais de turbulência do fluxo de ar de entrada têm pouca influência no desenvolvimento do spray. No campo de turbulência, os níveis de potência ao final da injeção foram semelhantes, independentemente das escalas integrais de turbulência de entrada.
Mühlbauer, Monika [Verfasser]. "Modelling wall interactions of a high-pressure, hollow cone spray / Monika Mühlbauer." Aachen : Shaker, 2009. http://d-nb.info/1161302034/34.
Повний текст джерелаChoi, Bernard. "Thermal interactions of pulsed laser radiation and cryogen spray cooling with skin." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3025203.
Повний текст джерелаKempthorne, Daryl Matthew. "The development of virtual leaf surface models for interactive agrichemical spray applications." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84525/12/84525%28thesis%29.pdf.
Повний текст джерелаBörnhorst, Marion [Verfasser]. "Urea-Water Sprays in NOx Emission Control Systems: Interaction with Solid Walls and Deposit Formation / Marion Börnhorst." Düren : Shaker, 2020. http://d-nb.info/1215461917/34.
Повний текст джерелаStratmann, Jochen. "Droplet wall and spray wall interaction at increased ambient pressure and wall temperature." Aachen Shaker, 2009. http://d-nb.info/995684472/04.
Повний текст джерелаGardiner, A. J. "The mathematical modelling of the interaction between sprinkler sprays and the thermally buoyant layers of gases from fires." Thesis, London South Bank University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234279.
Повний текст джерелаDressler, Daniel. "An experimental investigation of Newtonian and non-Newtonian spray interaction with a moving surface." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/71.
Повний текст джерелаDesflots, Melicie. "Environmental and Internal Controls of Tropical Cyclones Intensity Change." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_dissertations/120.
Повний текст джерелаKhan, Muhammad. "RANS and LES of multi-hole sprays for the mixture formation in piston engines." Phd thesis, Ecole Centrale de Lyon, 2014. http://tel.archives-ouvertes.fr/tel-01002111.
Повний текст джерелаStratmann, Jochen [Verfasser]. "Droplet-Wall and Spray-Wall Interaction at Increased Ambient Pressure and Wall Temperature / Jochen Stratmann." Aachen : Shaker, 2009. http://d-nb.info/1159832323/34.
Повний текст джерелаEmre, Oguz. "Modeling of spray polydispersion with two-way turbulent interactions for high pressure direct injection in engines." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2014. http://www.theses.fr/2014ECAP0029/document.
Повний текст джерелаThe ability to simulate two-phase flows is of crucial importance for the prediction of internal combustion engine (ICE) performance and pollutant emissions. The direct injection of the liquid fuel inside the combustion chamber generates a cloud of polydisperse droplets, called spray, far downstream of the injector. From the modeling point of view, the emergence of Eulerian techniques for the spray description is considered promising by the scientific community. Moreover, the bottleneck issue for Eulerian methods of capturing the droplet size distribution with a reasonable computational cost, has been successfully tackled through the development of Eulerian Multi Size Moment (EMSM) method. Towards realistic ICE applications, the present PhD work addresses the modeling of two-way turbulent interactions between the polydisperse spray and its surrounding gas-phase through EMSM method. Following to the moving mesh formalism ArbitraryLagrangian Eulerian (ALE), the source terms arising in the two-phase model have been treated separately from other contributions. The equation system is closed through the maximum entropy (ME) reconstruction technique originally introduced for EMSM. A new resolution strategy is developed in order to guarantee the numerical stability under veryfast time scales related to mass, momentum and energy transfers, while preserving the realizability condition associated to the set of high order moments. From the academic point of view, both the accuracy and the stability have been deeply investigated under both constant and time dependent evaporation laws. All these developments have beenintegrated in the industrial software IFP-C3D dedicated to compressible reactive flows. In the context of 2-D injection simulations, very encouraging quantitative and qualitative results have been obtained as compared to the reference Lagrangian simulation of droplets. Moreover, simulations conducted under a typical 3-D configuration of a combustion chamber and realistic injection conditions have given rise to fruitful achievements. Within the framework of industrial turbulence modeling, a Reynolds averaged (RA) extension of the two-way coupling equations is derived, providing appropriate closures for turbulent correlations. The correct energy partitions inside the spray and turbulent interactions between phases have been demonstrated through homogeneous test-cases. The latter cases gave also some significant insights on underlying physics in ICE. This new RA approach is now ready for ICE application simulations
PITTIA, PAOLA. "Physical state of sugar matrices and aroma-sugars interactions at nanoscale." Doctoral thesis, Università degli Studi di Trieste, 2016. http://hdl.handle.net/11368/2908096.
Повний текст джерелаHaglund, Charlotte. "Social interaction and identification among adolescents in multilingual suburban Sweden : a study of institutional order and sociocultural change /." Stockholm : Centre for Research on Bilingualism, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-457.
Повний текст джерелаMueller, James A. "On the transfer of momentum, heat and mass at the air-sea and air-sea spray interfaces." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 190 p, 2009. http://proquest.umi.com/pqdweb?did=1833621151&sid=5&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаMariani, Valerio <1991>. "Development of numerical methodologies to predict the liquid fuel sprays - wall interaction to optimize the mixing process of direct injection spark ignition engines." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10107/1/Tesi_dottorato-Valerio_Mariani.pdf.
Повний текст джерелаHartell, Ann. "Sprawl and Commuting: Exploring New Measures of United States Metro Regions." WU Vienna University of Economics and Business, 2015. http://epub.wu.ac.at/6095/1/sre%2Ddisc%2D2015_07.pdf.
Повний текст джерелаSeries: SRE - Discussion Papers
Peraza, Ávila Jesús Enrique. "Experimental study of the diesel spray behavior during the jet-wall interaction at high pressure and high temperature conditions." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/149389.
Повний текст джерела[ES] El potencial de los motores diesel en términos de robustez, eficiencia y la densidad de energía los ha hecho ser ampliamente usados como generadores de energía y sistemas propulsivos. Específicamente, la atomización de combustible, vaporización y mezcla de aire y combustible tienen un efecto fundamental en el proceso de combustión y, en consecuencia, un impacto directo en la formación de emisiones contaminantes, consumo de combustible y generación de ruido. Dado que la cámara de combustión tiene un espacio limitado con respecto la capacidad de penetración del chorro, el impacto de la pared se considera bastante común en motores de inyección directa diésel, que tienen una influencia relevante en la evolución del chorro y su interacción con el aire circundante y las paredes sólidas. Esto hace de interacción chorro-pared, un factor importante para el proceso de combustión que aún es dificilmente comprendido. En condiciones de arranque en frío, las bajas presiones y temperaturas en la cámara promueven la deposición de combustible en la pared del pistón, lo que conduce a un aumento en los niveles de formación de hidrocarburos no quemados. Además, las tendencias modernas de diseño como el incremento de las presiones de rail en los sistemas de inyección y la progresiva reducción en la cilindrada de los motores, favorecen la aparición de colisiones entre chorro y pared. A pesar de la evidente importancia en la comprensión de este fenómeno y los esfuerzos de los investigadores para alcanzarla, la transitoria naturaleza del proceso de inyección, sus pequeñas escalas de temporales y la complejidad de los fenómenos físicos que tienen lugar en las proximidades de la pared, hacen que la observación directa de esta interacción chorro-pared sea un desafío. Aunque las herramientas computacionales han demostrado ser invaluables en este campo de estudio, la necesidad de datos experimentales confiables para el desarrollo de esos modelos predictivos está muy presente. Esta tesis tiene como objetivo arrojar luz sobre las características fundamentales de la interacción chorro-pared (SWI por sus siglas en inglés) en condiciones de cámara similares a las de un motor diesel. Se colocó una pared plana a diferentes distancias de impacto y ángulos con respecto al jet. De esta manera, dos tipos diferentes de investigaciones experimentales sobre chorros en colisión se llevaron a cabo: se empleó una pared de cuarzo transparente en la cámara para, de forma aislada, analizar las características macroscópicas del chorro en condiciones evaporativas inertes y reactivas, que pueden observarse lateralmente y a través de la pared, gracias al uso de una instalación de alta presión y alta temperatura ópticamente accesible. Esta misma instalación se utilizó en el segundo tipo de experimentos en los que se introdujo una pared de acero inoxidable para capturar adicionalmente el efecto de las condiciones de operación en el flujo de calor entre ésta y el chorro durante los eventos de inyección y combustión y para determinar cómo la evolución del chorro y la llama son afectadas por una situación realista de transferencia de calor. Esta pared fue instrumentada para controlar la temperatura inicial de su superficie expuesta a la cámara y medir su variación con el tiempo, utilizando termopares de alta velocidad. Ensayos en condiciones de chorro libre también se realizaron para proporcionar una base comparativa sólida para esos experimentos.
[CA] El potencial dels motors dièsel en termes de robustesa, eficiència i la densitat d'energia els ha fet ser àmpliament usats com a generadors d'energia i sistemes propulsius. Específicament, l'atomització de combustible, vaporització i barreja d'aire i combustible tenen un efecte fonamental en el procés de combustió i, en conseqüència, un impacte directe en la formació d'emissions contaminants, consum de combustible i generació de soroll. Atès que la cambra de combustió té un espai limitat pel que fa la capacitat de penetració de l'raig, l'impacte de la paret es considera bastant comú en motors d'injecció directa dièsel, que tenen una influència rellevant en l'evolució del doll i la seva interacció amb el aire circumdant i les parets sòlides. Això fa d'interacció doll-paret, un factor important per al procés de combustió que encara és difícilment comprès. En condicions d'arrencada en fred, les baixes pressions i temperatures a la cambra promouen la deposició de combustible a la paret del pistó, el que condueix a un augment en els nivells de formació d'hidrocarburs no cremats. A més, les tendències modernes de disseny com l'increment de les pressions de rail en els sistemes d'injecció i la progressiva reducció en la cilindrada dels motors, afavoreixen l'aparició de col·lisions entre el doll i la paret. Tot i l'evident importància en la comprensió d'aquest fenomen i els esforços dels investigadors per aconseguir-la, la transitòria naturalesa de l'procés d'injecció, les seves petites escales de temporals i la complexitat dels fenòmens físics que tenen lloc en les proximitats de la paret , fan que l'observació directa d'aquesta interacció doll-paret siga un desafiament. Tot i que les eines computacionals han demostrat ser invaluables en aquest camp d'estudi, la necessitat de dades experimentals fiables per al desenvolupament d'aquests models predictius està molt present. Aquesta tesi té com a objectiu donar llum sobre les característiques fonamentals de la interacció doll-paret (SWI per les seues sigles en anglès) en condicions de cambra similars a les d'un motor dièsel. Es va col·locar una paret plana a diferents distàncies d'impacte i angles pel que fa al jet. D'aquesta manera, dos tipus diferents d'investigacions experimentals sobre dolls en col·lisió es van dur a terme: es va emprar una paret de quars transparent a la cambra per, de forma aïllada, analitzar les característiques macroscòpiques del doll en condicions evaporació inerts i reactives, que poden observar lateralment i a través de la paret, gràcies a l'ús d'una instal·lació d'alta pressió i alta temperatura òpticament accessible. Aquesta mateixa instal·lació es va utilitzar en el segon tipus d'experiments en els quals es va introduir una paret d'acer inoxidable per capturar addicionalment l'efecte de les condicions d'operació en el flux de calor entre aquesta i el dull durant els esdeveniments d'injecció i combustió i per determinar com l'evolució del doll i la flama són afectades per una situació realista de transferència de calor. Aquesta paret va ser instrumentada per controlar la temperatura inicial de la seua superfície exposada a la càmera i mesurar la seua variació amb el temps, utilitzant termoparells d'alta velocitat. Assajos en condicions de doll lliure també es van realitzar per proporcionar una base comparativa sòlida per a aquests experiments.
Peraza Ávila, JE. (2020). Experimental study of the diesel spray behavior during the jet-wall interaction at high pressure and high temperature conditions [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/149389
TESIS
Ries, Klaus [Verfasser]. "Accessing spoken interaction through dialogue processing / Klaus Ries." Karlsruhe : KIT-Bibliothek, 2001. http://d-nb.info/1013827791/34.
Повний текст джерелаFriedman, Jacob A. "Investigating the interaction of an annular air jet with a spray flame using phase-Doppler interferometry and laser-induced fluorescence." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0006/NQ30609.pdf.
Повний текст джерелаMariani, Valerio. "Validazione di metodologie di simulazione dell’impatto a parete di spray di combustibile iniettati ad alta pressione." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Знайти повний текст джерелаEduardo, Rodrigo. "Exploring Tumor Macrophage Interaction in Anaplastic Thyroid Cancer." Master's thesis, Universidade Nova de Lisboa. Instituto de Tecnologia Química e Biológica António Xavier, 2019. http://hdl.handle.net/10362/130111.
Повний текст джерелаN/A
Blei, Stefan [Verfasser]. "On the Interaction of non-Uniform Particles during the Spray Drying Process : Experiments and Modelling with the Euler-Lagrange Approach / Stefan Blei." Aachen : Shaker, 2006. http://d-nb.info/1186587172/34.
Повний текст джерелаBjörk-Willén, Polly. "Lära och leka med flera språk : socialt samspel i flerspråkig förskola /." Linköping : Tema Barn, Linköpings universitet, 2006. http://www.bibl.liu.se/liupubl/disp/disp2006/arts376s.pdf.
Повний текст джерелаHohmann, Sandra. "Mensch - Maschine - Interface : Studien zu einer Theorie der Mensch-Computer-Interaktion / Men - Machine - Interface : Studies towards a theory of human-computer-interaction." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968823734.
Повний текст джерелаLemetayer, Julien. "Etude par PIV par fluorescence de l’interaction d’un spray avec un écoulement gazeux en aérodynamique contrôlée : application à l’injection directe essence." Thesis, Rouen, INSA, 2016. http://www.theses.fr/2016ISAM0023/document.
Повний текст джерелаTwo-phase flows are involved in numerous actual industrial processes (agriculture, pharmacy, painting...). However, the complex interactions between phases (entrainment, particle trajectory modification, energy transfer...) are not well understood, especially for the gasoline direct injection, which represents the context of this study. For this experimental study, instantaneous dynamics of both phases are studied in a plan to highlight the aerodynamic interactions between phases. To achieve that, a two-phase FPIV diagnostic, based on using a fluorescent dye for each phase, is developed to simultaneously acquire separated images of each phase on two independent cameras. Instantaneous and simultaneous velocities of both phases are measured without any image pre-processing. Firstly, this optical diagnostic is applied to the characterisation of a spray injection in a gas at rest. The spray drags the gas by a momentum transfer from spray to gas. The spray droplet dispersion and the mixture between the two phases, which result from this kinetic energy transfer, depend on the spray topology and the injection pressure. Then, these interactions are studied in a transparent monocylinder engine. The comparison between cycles with and without injection reveals a significant impact of the spray presence on the internal aerodynamic through the development of new structures and the modification of tumble characteristics. The internal aerodynamic also modifies the spray development in comparison to the injection in a gas at rest
Patel, Nayan V. "Simulation of Hydrodynamic Fragmentation from a Fundamental and an Engineering Perspective." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16225.
Повний текст джерелаLenain, Luc. "Etudes expérimentales et numériques de la dynamique des vagues et leurs implications pour les échanges océan - atmosphère." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN033/document.
Повний текст джерелаOver the last several decades there has been growing recognition from both the traditional oceanographic and atmospheric science communities that to better understand the coupling between the atmosphere and the ocean, and reflect that understanding in improved air-sea fluxes of mass (e.g. gases, aerosols), momentum (e.g. generation of waves and currents) and energy (e.g. heat and kinetic energy for currents and mixing) in coupled ocean-atmosphere models, surface-wave processes must be taken into account. The underlying physics of the coupling depends on the kinematics and dynamics of the wave field, including processes of wind-wave growth, nonlinear wave-wave interactions, wave-current interactions and wave dissipation, with the last normally considered dominated by wave breaking. Here we present a series of experiments, both numerical and field observations, focusing on surface wave effects on air-sea interaction processes
Marthe, Jimmy. "Élaboration par projection plasma d'un revêtement bicouche d'alumine réfléchissant et diffusant. Contribution à la compréhension des phénomènes interaction rayonnement/matière." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0258/document.
Повний текст джерелаThis study deals with the manufacturing of reflecting and scattering coatings by plasma spraying process. By the selection of operating parameters and the control of the coatings microstructure, the first part of this work presents the elaboration of a micro/nanostructured bilayer material in alumina with a reflectance up to 90 % in the near UV-Visible range of wavelength. The feasibility of larger pieces (0.25m2) is demonstrated and the different characterizations for inserting the material in the Laser MegaJoule are performed. In a second part, from characterizations of the microstructure (by SEM, Hg Porosimetry, USAXS) and the chemical composition (DRX, X fluorescence), the improvement of the reflectance in the near-UV thanks to the nanostructured layer is explained, on the one hand, by the less absorbing crystallographic phase and, on the other hand, by the smaller and numerous pores. Moreover, the characterization of the radiation properties by the Radiation Transfer Equation inversion brings new elements for understanding the phenomena during radiation/porous media interaction and to determine the spatial repartition of the scattering radiation. The aim of the last part is to set up the different tools which are necessary to compute simulations of plasma-sprayed coatings optical behavior. From the microstructure analysis, a tridimensional numerical representation of each layer is suggested. The resolution of Maxwell equations is performed by FDTD (Finite Difference Time Domain) method. The model is validated and some first simulations are realized
Fransén, Nelly. "Studies on a Novel Powder Formulation for Nasal Drug Delivery." Doctoral thesis, Uppsala universitet, Institutionen för farmaci, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9292.
Повний текст джерелаMa, Mingfei. "Are there alternatives to greenbelts? : evidence from a new land-use transport interaction model for Greater Beijing." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/265001.
Повний текст джерелаCravigan, Luke. "The role of marine biota on the composition and concentration of potential cloud condensation nuclei." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/132173/1/Luke_Cravigan_Thesis.pdf.
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 джерелаSamuelfolk, Hugues. "The promotion of Swedish L2 students’ oral proficiency." Thesis, Karlstads universitet, Institutionen för språk, litteratur och interkultur (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-72842.
Повний текст джерелаSyftet med denna studie har varit att studera hur svenska engelskalärare främjar utvecklingen av elevers muntliga färdigheter i engelska. Genom att intervjua sex svenska engelskalärare på gymnasieskolan undersöker studien vilka metoder som används mest av lärarna för att utveckla elevernas muntliga färdigheter. Resultaten av studien visar att de flesta lärare som intervjuades på olika sätt uppmuntrar elevernas självförtroende, vilket i sin tur hjälper dem att utveckla deras muntliga färdighet. Tanken om att osäkerhet är skadligt för elevers utveckling av muntlig färdighet delades av alla lärare som intervjuades. En annan metod som användes av lärarna var att tillåta elever att arbeta i par eller grupper. Även om de flesta lärare använde den här metoden pekade de på olika saker som var viktiga att tänka på när det gällde grupp- och pararbeten. Nästa metod som lärarna använde berörde inspirerandet av en mer avslappnad eller bekväm miljö som möjliggör utvecklingen av elevers muntliga färdigheter. För lärarna var det viktigt att eleverna hade kul under muntliga övningar, och sålunda använde de flesta lärare olika spel när de utförde muntliga aktiviteter. Det sista konceptet som lärarna talade om var användningen av målspråket i klassrummet. Här var lärarens idéer inte i linje med varandra. Vissa trodde att det var bra att tvinga eleverna att använda målspråket under hela lektionen medan andra inte trodde det hjälpte elevernas utveckling av sitt muntliga språk. Om en student var osäker, hjälpte det inte, enligt dessa lärare, att tvinga studenten att tala engelska under lektionerna. De påpekade dock att eleverna var tvungna att under talaktiviteter och muntliga presentationer interagera på målspråket. De flesta av de koncept som lärarna introducerade liknade dem som hittades i tidigare studier om svenska engelskalärare. Dessutom kan resultaten av denna uppsats kopplas till tidigare forskning kring oral development for L2 learners.
Grommes, Patrick. "Prinzipien kohärenter Kommunikation." Doctoral thesis, Humboldt-Universität zu Berlin, Philosophische Fakultät II, 2007. http://dx.doi.org/10.18452/15615.
Повний текст джерелаThis doctoral thesis shows in how far principles of coherent communication can be traced back to psycholinguistically founded principles of text production. The so-called quaestio forms the common basis of text and dialogue production. As an implicit underlying question it sets preferences for the structure of a whole text as well as a single utterance. The quaestio ensures coherence of texts on a conceptual basis rather than merely through the use of lexical or grammatical means. Thus, the production of coherence can be seen as cognitive achievement not only by listeners, but also by speakers who have to follow planning constraints. The thesis discusses the terms coherence and cohesion as well as descriptive approaches dealing with these terms. Additionally, methods of dialogue analysis are confronted with each other. This discussion treats for example Rhetorical Structure Theory and Centering-Theory. The thesis discusses diverse methodological approaches, because it combines structural with qualitative analyses. Thus approaches such as Conversation Analysis, Clark’s concept of joint actions and joint activities, but also Pickering’s and Garrod’s alignment-theory are being treated. In the end the quaestio approach by Stutterheim is chosen, because it offers the widest explanatory framework from a psycholinguistic point of view. The main part of the thesis is dedicated to detailed analyses of real-life dialogue. In conclusion, principles of quaestio management in dialogues are proposed. Because the study treats a wide variety of interaction settings, it delivers a set of principles of coherence and their typical features that allows not only for analyses of any other set of dialogues, but may also support the development of communication routines. Therefore, this thesis hints on application scenarios of psycholinguistic research.
Almasri, Hanine. "Toxicologie des mélanges de pesticides chez des abeilles exposées à un agent pathogène : action combinée de l'agent pathogène Nosema ceranae, de l'insecticide imidaclopride, du fongicide difénoconazole et de l'herbicide glyphosate Mixtures of an insecticide, a fungicide and a herbicide induce high toxicities and systemic physiological disturbances in winter Apis mellifera honey bees Toxicity of the pesticides imidacloprid, difenoconazole and glyphosate alone and in binary and ternary mixtures to winter honey bees: effects on survival and antioxidative defenses Toxicological status changes the susceptibility of the honey bee Apis mellifera to a single fungicidal spray application Physiological effects of the interaction between Nosema ceranae and sequential and overlapping exposure to glyphosate and difenoconazole in the honey bee Apis mellifera." Thesis, Avignon, 2020. http://www.theses.fr/2020AVIG0722.
Повний текст джерелаCurrent scientific findings suggest a decline in the diversity and abundance of insects, including the honey bee Apis mellifera. The latter are facing high colony losses in several regions of the world such as Western Europe and the United States. Numerous studies suggest that the origin of bee colony decline is multi-causal and identify pesticides and pathogens as the main contributors to this decline. Co-exposure of honey bees to multiple pesticides and infection by multiple pathogens are common phenomena. However, research on the effects of pesticide mixtures has not been extensively developed. Thus, the thesis work has focused on determining the toxicity of pesticide mixtures, applied at environmental exposure levels, in the presence of pathogens. The choice was made to study the interactions between a neonicotinoid insecticide, imidacloprid, an azole fungicide, difenoconazole, and a herbicide, glyphosate, in the presence of the pathogen Nosema ceranae. The results of the different studies, carried out during this thesis, reveal the complexity of the studies on pesticide mixtures. The work allowed us to notice that the effects of a pesticide mixture can vary according to the concentrations of the pesticides constituting the mixture. The increase of the number of substances and the level of exposure does not necessarily induce an increase of the toxicity of the mixture. Furthermore, the effects of the mixture may vary depending on the sequence of exposure to the different pesticides and the health status of the honey bees. Pesticide mixtures affect the physiological state of individuals as a result of a systemic response related to disturbances of general mechanisms such as oxidative stress. However, these three pesticides, alone and in mixtures, have no effect on the installation of the intestinal microbiota at environmental exposure levels