Tesis sobre el tema "Collision reaction"
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Keane, Norman Washington. "Reaction dynamics of short lived collision complexes". Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329286.
Texto completoGYLLING, MARTIN. "Sensorless collision detection with safe reaction for a robot manipulator". Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263829.
Texto completoDetta examensarbete handlar om kollisionsdetektering och kollisionsreaktion för robotarmar utan vridmomentssensorer. Detekteringsmetoden som tidigare använts av [1], [2] bygger på en algoritm som uppskattar residual vridmomentet d.v.s. friktions- samt det externa vridmomentet i varje axel genom att enbart nyttja positionsgivare och strömsensorer på roboten. De dynamiska modellerna för roboten som används i algoritmen för beräkning av residual vridmomentet framtags med hjälp av Lagranges ekvationer, dessa modeller består av olika komponenter som påverkar vridmomenten i robotens leder så som tröghetsmoment, centripetalacceleration, corioliseffekt samt gravitation. Genom att ta fram modeller för friktionsvridmomenten i robotens axlar går det att jämföra de beräknade friktionsvridmomenten från modellerna med de uppskattade residual vridmomenten från algoritmen, skillnaden mellan dessa två vridmoment blir då en uppskattning på det externa vridmomentet som roboten utsätts för. Tröskelvärden för de externa vridmomenten bestäms genom experiment, dessa tröskelvärden är till för att upptäcka kollisioner genom att övervaka när de externa vridmomenten överskrider dessa värden. Till följd av att en kollision har upptäckts måste roboten reagera på ett sätt som minimerar risken att roboten eller omgivningen tar skada. Strategier för hur en robot kan reagera då en kollision inträffar har tagits fram av [3], ett par av dessa implementeras och jämförs för olika kollisionsfall i denna rapport. Kollisionsdetekteringen samt olika reaktionsstrategier implementerades på en UR5-e robot från Universal robots. Resultaten visade att den enkla reaktionen där roboten bromsar och sedan bibehåller positionen med hjälp av positionsreglering var den reaktion som var snabbast att stoppa rörelsen av roboten. På grund av risken att någon kan fastna mellan roboten och omgivningen valdes inte strategin som tidigare beskrevs. En strategi där roboten bromsar och sedan går in i ett fridrifts läge visade sig vara en bättre lösning då tiden att få stopp på roboten var bara något längre än den 2 snabbaste strategin samt att impulsen vid en kollision i genomsnitt var lägst av alla strategier som prövades. Då tidigare forskning i området för sensorlös kollisonsdetektering som refereras i denna rapport enbart har fokuserat på kollision detekteringen, bygger denna rapport vidare på den forskning som utförts genom att lägga till och implementera olika strategier för kollisionsreaktion på en robot utan vridmomentsensorer eller vridmomentsreglering. Genom att kombinera metoden för kollisionsdetektering tagen från [1], [2] med reaktions strategier från [3] har detta examensarbete visat hur en robotarm som inte har dyra vridmomentssensorer kan göras säkrare.
Dexter, Matthew A. "Thermodynamic and parametric optimisation of collision/reaction cells in plasma-source mass spectrometry". Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/34294.
Texto completoNeves, Denise Regina das [UNESP]. "Avaliação de interface de reação e colisão para eliminar interferências poliatômicas na análise de etanol combustível por ICP-MS". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/97823.
Texto completoConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A espectrometria de massa com plasma acoplado indutivamente empregando interface de reação/colisão (CRI-ICP-MS) foi avaliada para determinação simultânea de Al, Ba, Co, Cu, Cr, Fe, Mg, Mn, Mo, Na, Ni, Pb, Sb, Si, V e Zn em etanol combustível. Para as análises, amostras de etanol combustível foram diluídas vinte vezes de modo a conter 1% v/v de ácido nítrico e 10 μg L-1 Y utilizado como padrão interno. As calibrações foram feitas por ajuste de matriz utilizando etanol P.A.. Como gás de reação/colisão utilizou-se o hidrogênio e como gases auxiliares foram utilizados argônio e oxigênio. A CRI foi fundamental para a determinação da maioria dos analitos, principalmente Fe, Cr, Si e Mg. A escolha da melhor vazão do gás e a otimização dos parâmetros instrumentais foram estudadas utilizando soluções etanólicas contendo 10 μg L-1 dos analitos. Os limites de detecção para 27Al, 138Ba, 59Co,63Cu, 55Mn, 98Mo, 23Na, 58Ni, 208Pb, 121Sb, 51V e 64Zn em etanol por CRI-ICP-MS utilizando 20 mL min-1 de H2 no skimmer foram 0,2; 0,1; 0,005; 0,3; 0,02; 0,05; 0,8 0,2; 0,01; 0,1; 0,4 e 0,3 μg L-1, respectivamente. Os limites de detecção para 52Cr, 56Fe, 24Mg, 28Si em etanol utilizando 60 mL min-1 de H2 no skimmer foram 0,2; 0,1; 0,2 e 13,9 μg L-1. A validação do método foi feita por meio de testes de adição e recuperação dos analitos. Os intervalos de recuperação encontrados para 27Al, 138Ba, 59Co, 63Cu, 55Mn, 98Mo, 23Na, 58Ni, 208Pb, 121Sb, 51V, 64Zn, 52Cr, 56Fe, 24Mg, 28Si se apresentaram entre 78 e 114%
The use of inductively coupled plasma mass spectrometry with collision/reaction interface (CRI) was evaluated for simultaneous determination of Al, Ba, Co, Cu, Cr, Fe, Mg, Mn, Mo, Na, Ni, Pb, Sb, Si, V e Zn in ethanol fuel. Samples were diluted 1:20 v/v in a solution containing 1% v/v nitric acid and 10 μg L-1 Y used as internal standard. For all elements the instrument was operated in CRI-ICP-MS mode. The use of CRI was mandatory for Fe, Cr, Si e Mg. Hydrogen was evaluated as the reaction/collision gas and argon and oxygen were used as auxiliary gas. Selection of best reaction gas flow rate and optimization of the instrumental parameters were carried out using ethanolic solutions containing analytes at 10 μg L-1. Limits of detection for 27Al, 138Ba, 59Co, 63Cu, 55Mn, 98Mo, 23Na, 58Ni, 208Pb, 121Sb, 51V e 64Zn in ethanol fuel by CRI-ICP-MS using 20 mL min-1 H2 in the skimmer cone 0.2; 0.1; 0.005; 0.3; 0.02; 0.05; 0.8; 0.2; 0.01; 0.1; 0.4 and 0.3 μg L-1, respectively. The detection limits for 52Cr, 56Fe, 24Mg, 28Si using 60 mL min-1 H2 in the skimmer cone were respectively 0.2; 0.1; 0.2 and 13.9 μg L-1. Method validation was accomplished by the addition and recovery studies. Recoveries found for 27Al, 138Ba, 59Co, 63Cu, 55Mn, 98Mo, 23Na, 58Ni, 208Pb, 121Sb, 51V e 64Zn, 52Cr, 56Fe, 24Mg, 28Si were within the 78 - 114% interval
Schreiner, Lisa Marie. "An Investigation of the Effectiveness of A Strobe Light As An Imminent Rear Warning Signal". Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/35887.
Texto completoMaster of Science
Girard, Bertrand. "Etude de la collision reactive ii + f -> if + i par fluorescence induite par laser". Paris 6, 1987. http://www.theses.fr/1987PA066398.
Texto completoWright, Victoria E. "Ion mobility-mass spectrometry studies of organic and organometallic complexes and reaction monitoring". Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/14275.
Texto completoSeamons, Scott Andrew. "The collision dynamics of OH(A)+H2". Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:36319557-1efa-4840-8f46-c15479945a0c.
Texto completoNeves, Denise Regina das. "Avaliação de interface de reação e colisão para eliminar interferências poliatômicas na análise de etanol combustível por ICP-MS /". Araraquara : [s.n.], 2010. http://hdl.handle.net/11449/97823.
Texto completoBanca: Márcia Andréia Mesquita Silva da Veiga
Banca: Joaquim de Araujo Nóbrega
Resumo: A espectrometria de massa com plasma acoplado indutivamente empregando interface de reação/colisão (CRI-ICP-MS) foi avaliada para determinação simultânea de Al, Ba, Co, Cu, Cr, Fe, Mg, Mn, Mo, Na, Ni, Pb, Sb, Si, V e Zn em etanol combustível. Para as análises, amostras de etanol combustível foram diluídas vinte vezes de modo a conter 1% v/v de ácido nítrico e 10 μg L-1 Y utilizado como padrão interno. As calibrações foram feitas por ajuste de matriz utilizando etanol P.A.. Como gás de reação/colisão utilizou-se o hidrogênio e como gases auxiliares foram utilizados argônio e oxigênio. A CRI foi fundamental para a determinação da maioria dos analitos, principalmente Fe, Cr, Si e Mg. A escolha da melhor vazão do gás e a otimização dos parâmetros instrumentais foram estudadas utilizando soluções etanólicas contendo 10 μg L-1 dos analitos. Os limites de detecção para 27Al, 138Ba, 59Co,63Cu, 55Mn, 98Mo, 23Na, 58Ni, 208Pb, 121Sb, 51V e 64Zn em etanol por CRI-ICP-MS utilizando 20 mL min-1 de H2 no skimmer foram 0,2; 0,1; 0,005; 0,3; 0,02; 0,05; 0,8 0,2; 0,01; 0,1; 0,4 e 0,3 μg L-1, respectivamente. Os limites de detecção para 52Cr, 56Fe, 24Mg, 28Si em etanol utilizando 60 mL min-1 de H2 no skimmer foram 0,2; 0,1; 0,2 e 13,9 μg L-1. A validação do método foi feita por meio de testes de adição e recuperação dos analitos. Os intervalos de recuperação encontrados para 27Al, 138Ba, 59Co, 63Cu, 55Mn, 98Mo, 23Na, 58Ni, 208Pb, 121Sb, 51V, 64Zn, 52Cr, 56Fe, 24Mg, 28Si se apresentaram entre 78 e 114%
Abstract: The use of inductively coupled plasma mass spectrometry with collision/reaction interface (CRI) was evaluated for simultaneous determination of Al, Ba, Co, Cu, Cr, Fe, Mg, Mn, Mo, Na, Ni, Pb, Sb, Si, V e Zn in ethanol fuel. Samples were diluted 1:20 v/v in a solution containing 1% v/v nitric acid and 10 μg L-1 Y used as internal standard. For all elements the instrument was operated in CRI-ICP-MS mode. The use of CRI was mandatory for Fe, Cr, Si e Mg. Hydrogen was evaluated as the reaction/collision gas and argon and oxygen were used as auxiliary gas. Selection of best reaction gas flow rate and optimization of the instrumental parameters were carried out using ethanolic solutions containing analytes at 10 μg L-1. Limits of detection for 27Al, 138Ba, 59Co, 63Cu, 55Mn, 98Mo, 23Na, 58Ni, 208Pb, 121Sb, 51V e 64Zn in ethanol fuel by CRI-ICP-MS using 20 mL min-1 H2 in the skimmer cone 0.2; 0.1; 0.005; 0.3; 0.02; 0.05; 0.8; 0.2; 0.01; 0.1; 0.4 and 0.3 μg L-1, respectively. The detection limits for 52Cr, 56Fe, 24Mg, 28Si using 60 mL min-1 H2 in the skimmer cone were respectively 0.2; 0.1; 0.2 and 13.9 μg L-1. Method validation was accomplished by the addition and recovery studies. Recoveries found for 27Al, 138Ba, 59Co, 63Cu, 55Mn, 98Mo, 23Na, 58Ni, 208Pb, 121Sb, 51V e 64Zn, 52Cr, 56Fe, 24Mg, 28Si were within the 78 - 114% interval
Mestre
Salbaing, Thibaud. "Thermalisation dans une nanogoutte : évaporation versus réactivité". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1163/document.
Texto completoMolecular systems under irradiation are present in the living as well as in inert matter. From a macroscopic point of view, the matter is made up of a very large number of molecules but the action of radiation acts through the electrons located on a molecule and thus, creating locally and on short time scales a situation clearly far from the thermodynamic equilibrium. Studying molecular nanosystems under irradiation provides access to understanding of how the energy deposited in a molecule will be redistributed into the system through interactions between surrounding molecules.The velocity distributions of evaporated molecules measured for irradiated protonated methanol nanodroplets have a bimodal behaviour, as observed for water, including evaporation of molecules with much higher velocities than expected after complete redistribution of energy. In addition, a reaction in the cluster leading to the formation of protonated dimethyl-ether with elimination of a water molecule was observed. The possibility of studying the competition between molecular evaporation and an elimination reaction following irradiation of a nanodroplet will contribute to constrain the hypothesis on the formation of prebiotic molecules under interstellar conditions. The results for the water-methanol mixed nanodroplets were compared with those obtained with pyridine doped water nanodroplets and protonated water nanodroplets. Analysis of the low velocity part of the velocity distributions of the evaporated water molecules shows that evaporation occurs before the complete redistribution of energy in the cluster. It appears that there is less energy available for evaporation of a water molecule when the initial excitation is located on the protonated methanol ion or on the pyrimidium. Thus, unlike the hydronium ion which is fully solvated, impurities promote the growth of these small water clusters, whose presence in the atmosphere facilitates the early stages of aerosol formation
TRAPANI, STEFANO. "Task Oriented Programming and Service Algorithms for Smart Robotic Cells". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2743230.
Texto completoGadea, Florent Xavier. "Theorie des hamiltoniens effectifs : applications aux problemes de diabatisation et de collision reactive". Toulouse 3, 1987. http://www.theses.fr/1987TOU30276.
Texto completoKelly, L. J. "The study of ion structures and their reaction chemistry by high-pressure source and collision induced decomposition mass spectrometry". Thesis, Swansea University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637774.
Texto completoPALM, HARTMUT. "Etude des mecanismes de la reaction d'ions d'acetylene avec l'ethylene, en fonction de l'energie interne et de l'energie de collision". Paris 11, 1996. http://www.theses.fr/1996PA112107.
Texto completoHikmet, Iskender. "Etude des collisions réactives entre atomes de cuivre et composés halogènes". Grenoble 1, 1991. http://www.theses.fr/1991GRE10126.
Texto completoMcLaughlin, Shane Brendan. "Analytic Assessment of Collision Avoidance Systems and Driver Dynamic Performance in Rear-End Crashes and Near-Crashes". Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/29561.
Texto completoPh. D.
Perkins, Thomas Edward James. "The effects of electronic quenching on the collision dynamics of OH(A) with Kr and Xe". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:5998e249-35ff-4d05-9c13-9b65d59b11d9.
Texto completoLavaud, Franck. "Etude de la multifragmentation du systeme Au+Au entre 40 et 100 MeV/A: expansion et flot radial". Phd thesis, Université Paris Sud - Paris XI, 2001. http://tel.archives-ouvertes.fr/tel-00004100.
Texto completod'INDRA. A l'issue de ce travail, je me suis attaché à selectionner les collisions centrales.
Pour ce faire, et dans le souci de ne pas biaiser les interprétations physiques résultantes, j'ai mis en oeuvre deux méthodes distinctes: sélection en paramètre d'impact ainsi qu'une analyse en composante principale. Une étude comparative de ces deux outils mathématiques a été entreprise donnant lieu à des résultats très instructifs.
L'interprétation des résultats a fait appel à plusieurs types de modèles lesquels impliquant la validité de certaines hypothèses (équilibre thermodynamique, existence d'un volume de "freeze-out"). L'emploi de modèles statistiques (SMM, MMMC) a permis
d'extraire la taille du système émetteur, dit "source unique", ainsi que son énergie d'excitation. L'anisotropie des distributions en énergie cinétiques des fragments, a permis de
mettre en évidence, en fonction de l'énergie incidente de la collision, une déformation de la source, mais également de reconstruire les énergies thermique et collective entrant en jeu. Une nouvelle comparaison des données à l'aide de modèles dits "dynamique" (QMD,CMD) a été également entreprise. A l'issu de cette étude, des critiques portant sur la validité d'une approche telles SMM ou MMMC ont pu être émises remettant en jeu le fondement de l'interprétation physique du flot collectif couramment employé.
Kerr, Samantha Louise. "Enhancing nucleic acid detection using inductively coupled plasma mass spectrometry, by means of metal and nano-particle labelling". Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/4641.
Texto completoBoutalib, Abderrahim. "Etude théorique de la surface de potentiel du système HO::(2) + H. : Influence de la corrélation électronique". Pau, 1986. http://www.theses.fr/1986PAUU3009.
Texto completoJones, Deanna M. Rago. "A study of ion-molecule reactions in a dynamic reaction cell to improve elemental analysis with inductively coupled plasma-mass spectrometry". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1180534215.
Texto completoMarsh, R. J. "Kinematic modelling of non reactive and reactive collisions". Thesis, University of Sussex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270740.
Texto completoBarry, N. J. "Molecular beam studies of reactive collisions". Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375059.
Texto completoCharvet, Michael. "Recherche de l'apparition du phénomène de multifragmentation dans le système 32S+27Al". Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10065.
Texto completoMaria, Aoun. "Development of Analytical methods for the evaluation of the impact of phosphate fertilizer industry on marine environment". Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3033.
Texto completoDevelopment of Analytical methods for the evaluation of the impact of phosphate fertilizer industry on marine environment
Paul, Dilip K. "Redox Reactions at Oil-Water Interface by Particle Collision Electroanalysis". VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5406.
Texto completoRayner, Steven Phillip. "The stereodynamics of photo-initiated bimolecular collisions". Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320636.
Texto completoBen, bouchrit Ridha. "Etude théorique des collisions moléculaires réactives de type atome + molécule polyatomique". Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2037/document.
Texto completoWe have studied the reactive collisions, O (1D) + CH4 and O (1D) + H2O, of atmospheric and astrophysical interest, using different quantum chemistry methods and reaction dynamics approaches. For the first reaction, quantum dynamical calculations using a time-independent method were carried out on an existing potential energy surface by considering CH3 as a pseudo-atom. This reduced dimensionality approach, i.e. a pseudo triatomic model, yielded the calculation of the reaction probabilities at zero total angular momentum (J = 0). The cross sections and reaction rates have been computed by the approximate J-shifting method. Our quantum results were compared with results obtained by a quasi-classical trajectory method and experimental predictions. These comparisons, among others, have enabled the fact that the channel CH3 + OH was the main exit channel for this reaction. The second reaction O(1D) + H2O has been studied at the level of electronic structure. We have characterized the outline of the potential energy surface of H2O2 , taking into account all the degrees of freedom at a high level calculation (MRCI: Multi Reference Configuration Interaction). Thus, we were able to determine with great accuracy the geometries, frequencies and energies of isomers of the H2O2 system and its energy diagram. In the future, a potential energy surface has to be built to be used in the dynamical calculations for this reaction
Degen, Shane C. "Reactive image-based collision avoidance system for unmanned aircraft systems". Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46969/1/Shane_Degen_Thesis.pdf.
Texto completoOueslati, Ichraf. "Etude théorique de la formation catalytique de petites molécules sur des modèles de grains interstellaires". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066074.
Texto completoMolecular hydrogen is the most abundant molecule in the Universe. It was recognized long ago that the formation of molecular hydrogen most likely occurs on dust grains. Theoretical studies have focused on H2 formation mainly on model graphite surfaces and very recently on polycrystalline and amorphous foresterite [010]. It is within this framework that lies our study addressing the molecular hydrogen formation on new models of siliceous and silicateous surfaces. First, we studied the abstraction reaction by atomic hydrogen from tetramethylsilane in the gas phase. We used accurate methods of quantum chemistry based on the second-order perturbation theory and on the coupled clusters method. The KIEs and SKIEs were highlighted. CVT/SCT correction was applied to compute the reaction kinetics for a wide temperature range (180-2000 K). Given the importance of the quantum tunnelling effects at low temperatures, we investigated state-selected dynamics using quantum dynamics calculations. In order to achieve this purpose, a two-dimensional potential energy surface in the hyperspherical coordinates representation was built. Quantum calculations were performed using a reduced dimensionality approach applied to this collinear reactive collision problem. The comparison with the experimental results, performed within a temperature range between 425 and 570 K, shows a reasonable agreement.The H2 formation on nanosilicates, prototypes of silicate surfaces, was investigated. Using DFT, we identified physisorption and chemisorption sites for hydrogen atoms, then studied the diffusion of physisorbed hydrogen on the nanoclusters and calculated the energy properties and the activation energies for H2 recombination and desorption into the gas phase. Amorphous/porous grains with forsteritic composition tend to dissociate H2 and that the more crystalline/compact silicate grains would tend to catalyse H2 formation
Marinakis, Sarantos. "The dynamics of inelastic and reactive bimolecular collisions". Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.424735.
Texto completoVandor, Balazs. "Effects of displays and alerts on subject reactions to potential collisions during closely spaced parallel approaches". Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/23296.
Texto completoBauge, Eric. "Collisions d'ions lourds aux énergies intermédiaires : étude de la dynamique d'émission des particules chargées et caractérisation des émetteurs". Université Joseph Fourier (Grenoble ; 1971-2015), 1994. http://www.theses.fr/1994GRE10086.
Texto completoQuemet, Alexandre. "Contribution à la compréhension des réactions ion gaz dans les cellules de collision-réaction des ICP-MS : application à la résolution d'interférences isobariques et poly-atomiques". Thesis, Evry-Val d'Essonne, 2012. http://www.theses.fr/2012EVRY0021/document.
Texto completoInductively Coupled Plasma Mass Spectrometry (ICP-MS) emerged as the most essential technique in inorganic analytical chemistry thanks to its numerous assets, particularly its flexibility, its sensitivity and its reproducibility. As part of the elementary and isotopic analysis of irradiated fuel and transmutation target, the analyst is faced with a complex mass spectrum, due to the presence of many radionuclides. ICP-MS can not differentiate ions with the same mass, which induces isobaric and polyatomic interferences when the ions at the same mass are different chemical species. Last generations of ICP-MS have introduced collision reaction cells. It can in situ reduce these isobaric or polyatomic interferences. The cell is a multipol (quadrupole, hexapole or octopole) device filled with a collision and/or reaction gas. The gas molecules collide or possibly react with the ion beam, which eliminates or reduces interferences. Such resolution of interferences is based on the difference of chemical behaviours between the analyte and the interfering species: the choice of the gas is crucial. A better understanding of the “ion – gaz” reaction should help choosing the reacting gases. Three ICP-MS, with the different cell geometries, were used for this study: Perkin Elmer Elan DRC e (quadrupole), Thermo Fischer X serie II (hexapole) and Agilent Technologies 7700x (octopole). The effects of the cell geometry on different experimental parameters and on the resolution of the 56Fe+/40Ar16O+ polyatomic interferences were examined to measure iron at trace or ultra-trace level. This preliminary study was applied to measure iron as impurities in uranium oxide, the method was then validated with a Certified Reference Material. The reactivities of transition metals (Zr, Ru, Pd, Ag, Cd, Sn), lanthanides (La, Ce, Nd, Sm, Eu, Gd, Dy, Er and Yb) and actinides (U, Np, Pu, Am and Cm), elements of interest in the nuclear field, are studied with numerous gases (O2, CO, CO2, N2O, NO, CH4, C2H4, C3H8, NH3, CH3Cl and COS). Among these gases, ammonia appears to be a selective gas for lanthanides and actinides. DFT (Density Functional Theory) and ab initio calculations (MP2 and CCSD(T)) were able to reproduce the reactivity differences among lanthanide cations (La+, Sm+, Eu+ and Gd+). Reaction paths, potential energy surfaces, molecular orbitals and the influence of the electronic configuration along the reaction path are used to propose an explanation for the observed differences in the chemical behaviours. A few experimental results and quantum calculations indicate how to extend these explanations to actinides
Ferger, Neil Michael. "Some gas phase reactions of oxygen and halogen atoms under single collision conditions". Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257953.
Texto completoLange, Michael. "Competition between reaction channels in electron collisions of the hydrogen molecular ion HD+". [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962794775.
Texto completoFrancalanza, Laura. "Exploring Central Collisions in the Reaction 58Ni+48Ca at 25 AMeV with CHIMERA". Doctoral thesis, Università di Catania, 2015. http://hdl.handle.net/10761/1715.
Texto completoBhatti, Zaheer Ahmed. "Theoretical studies of collisional energy transfer in unimolecular reactions". Thesis, King's College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286244.
Texto completoRashid, Shaan. "Dual-spray Synthesis and Reactions". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35726.
Texto completoBeck, Jonathan R. "Collision velocity dependence of products formed via surface induced dissociation /". free to MU campus, to others for purchase, 2001. http://wwwlib.umi.com/cr/mo/fullcit?p3025601.
Texto completoTa, C. T. "A theoretical study of charge-transfer reactions in collisions between identical ions". Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378294.
Texto completoXu, Yaodong. "Applications of mass spectrometric techniques to charge-transfer processes and cluster ion reactions". Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/26208.
Texto completoHughes, Dominic Wyndham. "The stereodynamics of photon-initiated bimolecular reactions". Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299816.
Texto completoGatchell, Michael. "Collision Induced Fragmentation of Molecules and Molecular Clusters : Knockout Driven Reactions in Fullerenes and PAHs". Licentiate thesis, Stockholms universitet, Fysikum, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-103501.
Texto completoViquez, Rojas Oscar Alberto. "Evaluation of an acoustic detection algorithm for reactive collision avoidance in underwater applications". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83753.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (page 33).
This thesis sought to evaluate a vehicle detection algorithm based on a passive acoustic sensor, intended for autonomous collision avoidance in Unmanned Underwater Vehicles. By placing a hydrophone at a safe distance from a dock, it was possible to record the acoustic signature generated by a small motor boat as it navigated towards, and then away from the sensor. The time-varying sound intensity was estimated by Root Mean Square of the sound amplitude in discrete samples. The time-derivative of the sound intensity was then used to estimate the time to arrival, or collision, of the acoustic source. The algorithm was found to provide a good estimate of the time to collision, with a small standard deviation for the projected collision time, when the acoustic source was moving at approximately constant speed, providing validation of the model at the proof-of-concept level.
by Oscar Alberto Viquez Rojas.
S.B.
Kassab, Emile. "Contribution à l'étude théorique de la réactivité des états excités de Rydberg de plus basse énergie de petits systèmes polyatomiques par des méthodes quantiques". Paris 6, 1987. http://www.theses.fr/1987PA066450.
Texto completoEyles, Chris J. "An experimental and theoretical study of the dynamics of atom-molecule scattering". Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:d887db09-915e-4b3b-80e0-e9f1684518db.
Texto completoBarton, Robert Allan. "Multi-strange hyperon production in relativistic heavy -ion collisions". Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367744.
Texto completoRIAHI, KARIM. "Differentiation d'hydrocarbures aromatiques polycycliques isomeres par reactions ion-molecules, collisions dissociatives et reactives". Paris 6, 1999. http://www.theses.fr/1999PA066647.
Texto completoLiu, Tingting. "Exclusive measurements with the spectrometer HADES in proton-proton reactions at 1. 25 GeV". Paris 11, 2010. http://www.theses.fr/2010PA112297.
Texto completoThe detailed study of the pionic decay and the first measurement of Dalitz decay of Δ(1232) resonance have been carried out with the High Acceptance Di-Electron Spectrometer (HADES) at GSI, Darmstadt. HADES developed in the last years an elementary reaction program aimed at providing selective information on different sources of di-electron emission as a complement to the heavy-ion experiments. The measurements discussed in this thesis refer to one experiment in this program, the study of proton-proton collisions at a kinetic beam energy of 1. 25 GeV. This energy is chosen just below the η production threshold and devoted to study the Δ Dalitz decay, which is one of the main sources of di-electron emission at intermediate e+e- invariant masses (0. 15 GeV/c2< Me+e-< 0. 5 GeV/c2). To provide a control of the cross sections and on the Δ resonance production mechanisms required by the study of the Δ Dalitz decay process, the full analysis of the pp→npπ+ at 1. 25 GeV has been performed, which is the main contribution of this PhD work. The results, such as the acceptance corrected mass and angular distributions of the pp→NΔ process and the Δ→Nπ decay angular distribution are shown and the comparisons to models are discussed. Another contribution of this PhD is a simulation study on helicity angle distributions, which was proposed on the one band as a support to the data analysis of the Δ Dalitz decay exclusive measurements and on the other hand as a reference to the preliminary results of helicity angle distribution obtained with inclusive e+e- in Ar+KCI collisions