Tesis sobre el tema "Ionizz"
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Padoan, Sara <1991>. "DETERMINAZIONE DI COMPOSTI IONICI IN CAMPIONI ANTARTICI MEDIANTE CROMATOGRAFIA IONICA ACCOPPIATA ALLA SPETTROMETRIA DI MASSA". Master's Degree Thesis, Università Ca' Foscari Venezia, 2015. http://hdl.handle.net/10579/6891.
Texto completoStraccialano, Raffaela. "Simulazioni atomiche di canali ionici del potassio: limiti del Force Field AMBER nelle stime di conduttanza". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/19971/.
Texto completoBOZZA, SARA. "ARCHITETTURA IONICA A HIERAPOLIS DI FRIGIA". Doctoral thesis, Università Cattolica del Sacro Cuore, 2016. http://hdl.handle.net/10280/10487.
Texto completoThis doctoral research is part of the activities of MAIER – Italian Archaeological Mission in Hierapolis of Phrygia (Pamukkale, Turkey) and of the investigation field on the ancient architecture in Asia Minor. Some buildings and architectural blocks of Ionic order, recently discovered, are analyzed in order to achieve a reconstruction of the monuments, not only of the plan and elevation, but also of the ancient functions and use of the buildings. The stylistic analysis is also very important, to determine the chronology of the monuments and to relate the Ionic architecture of Hierapolis with the other urban centres in Asia Minor and their architectural tradition during the Imperial period. The dissertation is focused on both the sanctuaries of Hierapolis: in the Sanctuary of Apollo, the research analyzes the Temple C, a series of Ionic capitals with decorated hypotrachelion, and a group of architectural blocks from a (Corinthian) temenos portico; in the Ploutonion, the focus is on a series of blocks from an Ionic Stoa, related to the cultic theatre.
BOZZA, SARA. "ARCHITETTURA IONICA A HIERAPOLIS DI FRIGIA". Doctoral thesis, Università Cattolica del Sacro Cuore, 2016. http://hdl.handle.net/10280/10487.
Texto completoThis doctoral research is part of the activities of MAIER – Italian Archaeological Mission in Hierapolis of Phrygia (Pamukkale, Turkey) and of the investigation field on the ancient architecture in Asia Minor. Some buildings and architectural blocks of Ionic order, recently discovered, are analyzed in order to achieve a reconstruction of the monuments, not only of the plan and elevation, but also of the ancient functions and use of the buildings. The stylistic analysis is also very important, to determine the chronology of the monuments and to relate the Ionic architecture of Hierapolis with the other urban centres in Asia Minor and their architectural tradition during the Imperial period. The dissertation is focused on both the sanctuaries of Hierapolis: in the Sanctuary of Apollo, the research analyzes the Temple C, a series of Ionic capitals with decorated hypotrachelion, and a group of architectural blocks from a (Corinthian) temenos portico; in the Ploutonion, the focus is on a series of blocks from an Ionic Stoa, related to the cultic theatre.
Bernhem, Kristoffer. "How ionic are ionic liquids?" Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41033.
Texto completoBarros, Davison Storai de. "Estudo espectroscopico e morfologico de filmes automontados de azocompostos". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249464.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
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Resumo: Neste trabalho são estudadas as propriedades fotoquímicas e morfológicas de filmes automontados compostos de um polieletrólito fraco e azocorantes em função das condições impostas nas soluções de origem, como o pH, a força iônica e tamponamento. Na automontagem, os filmes são fabricados pela deposição de camadas alternadas de dois materiais, de cargas elétricas opostas, a partir de suas soluções aquosas em um substrato de vidro. Os materiais usados foram o polieletrólito catiônico hidrocloreto de poli(alilamina) (PAH) e três azocorantes aniônicos: Vermelho do Congo (CR), Ponceau SS (PSS) e Alaranjado de Metila (MO). Foram fabricados filmes de PAH/CR, PAH/PSS e PAH/MO. Para avaliar somente o efeito do pH, foram usados três valores de pH (3, 7 e 10). Para verificar o efeito da força iônica, foram usadas soluções aquosas de cloreto de potássio em diferentes concentrações e, para verificar a influência de tampão, foram usados três sistemas tampão, um para cada valor de pH. Foram usadas as técnicas de espectroscopia UV-vis e turbidimetria para investigar as propriedades espectroscópicas das soluções, dos filmes e a solubilidade do PAH. Foi utilizada a técnica de microscopia de força atômica para verificar a morfologia do filme. Observa-se que a deposição dos corantes e do PAH no filme depende de suas densidades de carga, bem como da presença de outras espécies iônicas em solução. Tanto um aumento do pH como a presença de contra-íons, leva a uma redução da carga do PAH e causa um aumento de sua adsorção no filme, acompanhado de um aumento de rugosidade superficial. Porém, a primeira condição pode ou não diminuir as cargas dos corantes e a segunda enfraquece a atração eletrostática, reduzindo as suas deposições. As interações do par corante-PAH induzem a agregação dos corantes em solução e nos filmes. As diferenças estruturais dos corantes são igualmente importantes, pois o CR e o PSS são os que mais se depositam e apresentam diferentes comportamentos de deposição em função do pH. Verifica-se também que o PAH interage distintamente com diferentes contra-íons, o que pode ser explicado considerando-se a especificidade iônica e não o simples conceito de força iônica
Abstract: In this work, the photochemical and morphological properties of layer-by-layer self¿assembly films made of a weak polyelectrolyte and azodyes are studied in dependence of the solution¿s pH, ionic strength and buffering. In self-assembly technique, films are made from deposition of alternate layers of two compounds, which have opposite electrical charges, from their solutions onto a glass substrate. We employed the polyelectrolyte poly(allylamine) hydrochloride (PAH) which is positively ionized when in aqueous solution and the three different anionic azodyes: Congo Red (CR), Ponceau SS (PSS) and Methyl Orange (MO). Films of PAH/CR, PAH/PSS and PAH/MO were prepared. To investigate only the pH effect, three pH values were used (3, 7 and 10). To investigate the ionic strength, potassium chloride aqueous solution at different concentrations were used and to verify the buffer effect, three buffer systems were used, one for each pH. The UV-Vis Spectroscopy and Turbidimetry were employed to study the spectroscopic properties of the solutions, films and PAH solubility. The Atomic Force Microscopy was used to verify the film morphology. One observes that the dyes and PAH deposition depend on their charge densities as well the presence of other ionic species. An increase in solution¿s pH and/or the presence of counter-ions reduces PAH¿s charge increasing its adsorption on film, accompanied by a higher surface roughness. Differently, the first condition can or cannot reduce the dye¿s charge and the second weakens the electrostatic interaction, reducing dye adsorption. The pair dye-PAH interactions induces the dye aggregation both in solution and film. The structural differences between dyes are equally important, as CR and PSS are the ones that adsorb most and show different deposition behavior in function of solution¿s pH. Also, one verifies that PAH interacts distinctly with different counter-ions, a fact that can be explained considering ionic specificity and not by the simple concept of ionic strength
Mestrado
Físico-Química
Mestre em Química
Avala, Usha Kranthi. "Ionic Conductivity in Non-Ionic Compounds". TopSCHOLAR®, 2013. http://digitalcommons.wku.edu/theses/1279.
Texto completoLATINI, GIULIO. "Bio-based ionic liquids and poly(ionic liquid)s for CO2 capture". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2912980.
Texto completoFigueira, Sebastiao Miguel. "Ionized regions and star formation in the galaxy". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0291.
Texto completoMy PhD thesis deals with the study of the interaction between high mass stars and their surrounding medium. I am particularly interested in the way high-mass stars affect the young stars observed around them. Massive stars form ionized (HII) regions which, during their supersonic expansion, lead to the formation of a layer of gas and dust where the conditions seem to favor star formation. My work aims at understanding the properties of star formation around Galactic HII regions.Using \herschel\, data (HOBYS and Hi-GAL programs) complemented with ancillary data, I studied two Galactic \HII\, regions (RCW~79 and RCW~120) to characterize the star formation observed at their edges. To study the impact of the ionization pressure, I computed the Star Formation Rate (SFR), which suggests that RCW~79 and RCW~120 are active star-forming regions despite their low gas surface density.A new study about the G345 region is in progress. This HII region is located above the Galactic plane and is actively forming stars. With the data available, the star formation's properties is being derived such as the spatial distribution of clumps, their stellar content, the SFR and CFE. This new study offers another opportunity to better understand the photoionization feedback out of the Galactic plane. Moreover, this will complete the sample of detailed studies of \HII\, regions, allowing us to obtain a global view of the mechanisms at play and of the efficiency of star formation in these regions
Paschalidi, M. "Constructing Ionian identities : the Ionian Islands in British official discourses, 1815-1864". Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19415/.
Texto completoOchoa, Becerra Erika Abigail. "Aceleração da nitretação iônica pela nanoestruturação de superfícies metálicas induzidas por bombardeio com gases nobres". [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277721.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: A presente tese trata o estudo as propriedades físicas resultantes em sistemas metálicos com superfícies nanoestrutura as pelo bombardeio com gás nobre e posteriormente nitretados com técnicas basea as em plasma. A busca e novas condições e tratamento que aumentem a velocidade a ifusão o nitrogênio é e grande interesse para a modificação e superfícies metálicas. Para isto, o pré-tratamento a superfície o material, através e métodos e refinamento os grãos a superfície, é fundamental na melhora a incorporação e nitrogênio no material. Este trabalho visa o estudo e sistemas basea os em ferro, especialmente aços e interesse tecnológico, com superfícies refinadas até a escala nanométrica e submeti os ao processo e nitretação. Neste caso, a superfície a amostra considera a po e ser nanoestrutura a por bombar eiodiônico com gases nobres ("atomic attrition") e posteriormente nitreta a usan o feixe e íons. O material escolhi o para o presente trabalho é o aço enomina o AISI 4140, um aço e baixa liga. O tratamento superficial ("atomic attrition") prévio ao processo e nitretação possibilita o aumento o conteúdo e nitrogênio em profundidade permitindo ainda que a nitretação possa ser realizada a temperaturas relativamente mais baixas (T ~ 300 °C). A caracterização as amostras pré-trata as e/ou nitretadas é realizada in-situ por espectroscopia e elétrons fotoemitidos garantindo condições únicas para o estudo o fenômeno e nanoestruturação e sua influência na ifusão o nitrogênio. Outras técnicas usuais e caracterização utiliza as foram a nano-in entação, raios-X (em nosso grupo e no LNLS) e microscopia óptica e eletrônica. Os resultados indicam o sucesso na nanoestruturação a superfície as amostras pela formação e caminhos e rápida difusão e nitrogênio e assim aumentando a dureza resultante o material
Abstract: The present thesis treats the stu y of the physical resultant properties in metallic systems with nano-structure surfaces by the bombar ment with noble gas an subsequently nitri e with techniques base on plasma. The search for new con itions of treatment that increase the spee of diffusion of the nitrogen is of great interest for the modification of metal surfaces. For this, the pre-treatment of the material surface, through methods of refinement of the grains at the surface, is fundamental in the improvement of the incorporation of nitrogen in the material. This work aims at the study of systems base on iron, especially steels of technological interest, with surfaces refine up to the nanometric scale an subjecte to the nitriding process. In this case, the surface of the considere sample can be nano - structure by ionic bombar ment with noble gases ("atomic attrition") an subsequently nitride using bundle of ions. The material chosen for the present work is the steel AISI 4140, a steel of low alloy. The superficial treatment ("atomic attrition") prior to the process of nitriding makes possible the increase of the content of nitrogen in epth allowing still that nitriding could be carrie out to relatively lower temperatures (T ~ 300 °C). The characterization of the samples pre-treate an / or nitride is carrie out in-situ by spectroscopy of photo-emitte electrons guaranteeing singular conditions for the study of the phenomenon of nano-structuring an its influence in the nitrogen iffusion. Other usual techniques of characterization use were nano - in dentation, X-rays (in our group an at LNLS), optical an electronic microscopy. The results indicate the success in the nano - structuring of the sample surface for the formation of ways of quick diffusion of nitrogen an so increasing the resultant har ness of the material
Doutorado
Física da Matéria Condensada
Doutor em Ciências
Ariyadi, Hifni Mukhtar. "Thermodynamic study on absorption refrigeration systems using ammonia/ionic liquid working pairs". Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/396178.
Texto completoChurchill, Layne Russell. "Trapping triply ionized thorium isotopes". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37161.
Texto completoMarinou, Pénélope. "Le tourisme dans l'archipel ionien". Aix-Marseille 1, 1993. http://www.theses.fr/1993AIX10017.
Texto completoYang, Junhong. "GLASS FORMATION BEHAVIOR AND IONIC CONDUCTIVITY OF IONIC LIQUIDS AND POLYMERIC IONIC LIQUID: INSIGHT FROM MOLECULAR SIMULATION". University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1494886213137829.
Texto completoColes, Samuel. "Interfacial nanostructure of solvate ionic liquids and ionic liquid solutions". Thesis, University of Oxford, 2018. https://ora.ox.ac.uk/objects/uuid:89c797e4-e000-4c8c-b6b8-ffa5ed202a4d.
Texto completoKattner, Hendrik. "Radical Polymerization Kinetics of Non-Ionized and Fully-Ionized Monomers Studied by Pulsed-Laser EPR". Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://hdl.handle.net/11858/00-1735-0000-0028-879B-7.
Texto completoLe, Goff Johan. "Evolution tectono-sédimentaire du système carbonaté "Plateforme Apulienne - Bassin Ionien" au Crétacé supérieur dans le sud de l'Albanie : faciès, géométries, diagénèse et propriétés réservoirs associées". Thesis, Bordeaux 3, 2015. http://www.theses.fr/2015BOR30024/document.
Texto completoThe evolution of tropical carbonate platforms depends on complex interacting factors influencing the sedimentation, such as tectonism, climate, eustacy, hydrodynamism etc… Due to this complexity, it has been of scientific interest for decades. Carbonate platforms are not only prone to accumulate sediments, but also represent prolific carbonates “factories” producing more than they can store on their tops. Excess sediments are shed basinward. Platform-to-basin transitions exemplify interactions between in-situ carbonate production, transfer and sedimentary accumulations resulting from re-sedimentation. In south-west Albania, the Upper Cretaceous carbonate series are made up of platform and basinal deposits. Sedimentary successions are presently integrated in the Dinarides-Hellenides fold-and thrust belt that originate from a Plio-Holocene phase of the Alpine Orogeny. The paleogeographic setting during the Late Cretaceous reveals a juxtaposition of mega-platforms and adjacent basins, partly filled with sediments derived from the shelf edge. Our scientific investigations focused on five study areas. Macro- and microfacies descriptions are provided for eight platform and basin successions. Sedimentary units are defined and mapped on each study area, supporting the stratigraphic reconstruction of the system. Dating is based on biostratigraphy and supported by strontium-isotope data. Regarding platform deposits, facies descriptions are seconded by complementary methods of petrography (cathodoluminescence, epifluorescence, scanning electron microscopy), petrophysics (mercury intrusion porosimetry), and geochemistry (stable carbon and oxygen isotopes), aiming to precise the sedimentation dynamics and reservoir properties of the succession. The sedimentation conditions are specified: i) within the platform, ten specific facies are identified, precising the depositional setting that comprise supra-, inter- and subtidal environments. These facies are integrated in distinctive stacking patterns (small-scale-sequences) pointing to a cyclic sedimentary dynamic controlled by high-frequency and low-amplitude sea level changes; ii) the basinal deposits comprise fourteen facies classified according to the dominant grain-support mechanism. Spatial distribution of the deposits allowed identifying the provenance and preferential sources of calciclatic sediments. The tectono-sedimentary evolution of the platform-to-basin system during the Late Cretaceous can be subdivided into two sequences: i) from the Cenomanian to the Turonian, the platform sedimentation is characterized by a substantial aggradation (700 meters) of intertidal small-scale sequences. No significant transfer was evidenced in the adjacent Ionian Basin, pointing to stable conditions in a subsiding context; ii) the Coniacian-Santonian interval evidences the establishment of a rudist platform massively shedding sediments basinward during the Campanian. A clear progradation of gravity-flow deposits is attested during this period. During the Upper Campanian and Maastrichtian, this transfer is accentuated by the setting of tectonically-triggered slumps resulting from the dismantling of the platform edge
Santos, Júnior Garbas Anacleto 1988. "Desenvolvimento de um novo eletrólito polimérico baseado num derivado de PEO e metais de transição para aplicação em dispositivos fotoeletroquímicos". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248375.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
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Resumo: Neste trabalho são apresentados os resultados da preparação e caracterização de eletrólitos poliméricos usando matriz polimérica de um copolímero derivado de PEO - poli (óxido de etileno-co-2-(2-metoxietoxi) etil glicidil éter) - P(EO-EM) - visando à substituição do par redox, I/I3 , usualmente mais comum em células solares do tipo DSSC, por pares de íons de metais de transição, como Fe e Co . Os eletrólitos foram preparados utilizando razões mássicas fixas de P(EO-EM):GBL de 30-70%. Para os eletrólitos de ferro foram utilizados os sais de FeCl2 + FeCl3·6H2O e para os eletrólitos de cobalto CoCl2 · 6H2O + CoF3. Em ambos os casos foram estudados razões molares entre os cátions de valência II:III de 1:1 e 10:1. Diferentes razões mássicas foram estudadas, sendo estas de 2, 5, 8 e 16% para os eletrólitos de ferro e de 1, 2, 3 e 5% para os eletrólitos de cobalto. Valores máximos de condutividade para os eletrólitos contendo sais de ferro foram de 1,88 x 10 e 1,40 x 10 S cm-1, para concentrações de 16% de sal e razões de 1:1 e 10:1 (Fe:Fe), respectivamente. Enquanto que no caso dos eletrólitos contendo cátions de cobalto foram de 1,41 x 10 e 1,16 x 10 S cm, para concentrações de 5% de sal e razões de 1:1 e 10:1 (Co:Co), respectivamente. Testes de PIA- Photoinduced Absorption Spectroscopy mostraram a eficiência do par redox Fe para regeneração dos corantes L0, N719, D35 e Z907. Entretanto, os mesmos testes mostraram a eficiência do par redox Co para regeneração somente do corante L0. A confecção de dispositivos do tipo DSSC com eletrólitos contendo sais de Fe e Co apresentaram resultados insatisfatórios, possivelmente relacionado com a alta taxa de recombinação do elétron ejetado no TiO2 com os mediadores redox
Abstract: This work presents the results of the preparation and characterization of polymer electrolytes using polymeric matrix of a PEO copolymer-poly (ethylene oxide-co-2-(2-methoxyethoxy) ethyl glycidyl ether) - P (EO-EM) - in order to substitute the redox couple , I-/I3-, usually most common mediators in DSSC solar cells, by transition metal ions pairs, such as Fe and Co . The electrolytes were prepared using fixed P(EO-EM) : GBL weight ratios of 30-70 % . The iron electrolytes were prepared using FeCl2 + FeCl3 o 6H2O salts and CoCl2 o 6H2O + CoF3 were used for the cobalt electrolytes. In both cases, it was studied the molar ratios between cations with valence of II: III of 1:1 to 10:1. Different weight ratios were studied, 2 , 5, 8 and 16% for iron electrolytes and 1 , 2, 3 and 5% for the cobalt electrolytes . Maximum conductivity values for the electrolyte containing iron salts were 1.88 x 10 and 1.40 x 10 S cm at salts concentrations of 16 % and ratios from 1:1 to 10:1 (Fe:Fe), respectively. While in the case of electrolyte containing cobalt cations the conductivity values were 1.41 x 10 and 1.16 x 10 S cm -1 at salts concentrations of 5 % and ratios from 1:1 to 10:1 ( Co:Co), respectively . PIA tests - Photoinduced Absorption Spectroscopy- showed the efficiency of the FeII/III redox couple for the regeneration of L0 , N719 , Z907 and D35 dyes. However, the same tests have shown that the CoI redox couple were only able to regenerate the L0 dye. The DSSC devices with electrolytes containing Fe and Co salts showed unsatisfactory results, possibly related to the high rate of recombination of the electron ejected in TiO2 with the redox mediators
Mestrado
Quimica Inorganica
Mestre em Química
Adamová, Gabriela. "Phosphonium ionic liquids". Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.554341.
Texto completoAkle, Barbar Jawad. "Multilayer Ionic Transducers". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31733.
Texto completoMaster of Science
Davidson, Jacob Daniel. "Actuation and Charge Transport Modeling of Ionic Liquid-Ionic Polymer Transducers". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/31204.
Texto completoMaster of Science
Ballantyne, D. R. "Ionized accretion discs around black holes". Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596325.
Texto completoMenzel, Raymond. "Multifluid magnetohydrodynamics of weakly ionized plasmas". Thesis, Rensselaer Polytechnic Institute, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3630022.
Texto completoThe process of star formation is an integral part of the new field of astrobiology, which studies the origins of life. Since the gas that collapses to form stars and their resulting protoplanetary disks is known to be weakly ionized and contain magnetic fields, star formation is governed by multifluid magnetohydrodynamics. In this thesis we consider two important problems involved in the process of star formation that may have strongly affected the origins of life, with the goal of determining the thermal effects of these flows and modeling the physical conditions of these environments.
We first considered the outstanding problem of how primitive bodies, specifically asteroids, were heated in protoplanetary disks early in their lifetime. Reexamining asteroid heating due to the classic unipolar induction heating mechanism described by Sonett et al. (1970), we find that this mechanism contains a subtle conceptual error. As original conceived, heating due to this mechanism is driven by a uniform, supersonic, fully-ionized, magnetized, T Tauri solar wind, which sweeps past an asteroid and causes the asteroid to experience a motional electric field in its rest frame. We point out that this mechanism ignores the interaction between the body surface and the flow, and thus only correctly describes the electric field far away from the asteroid where the plasma streams freely. In a realistic protoplanetary disk environment, we show that the interaction due to friction between the asteroid surface and the flow causes a shear layer to form close to the body, wherein the motional electric field predicted by Sonett et al. decreases and tends to zero at the asteroid surface. We correct this error by using the equations of multifluid magnetohydrodynamics to explicitly treat the shear layer. We calculate the velocity field in the plasma, and the magnetic and electric fields everywhere for two flows over an idealized infinite asteroid with varying magnetic field orientations. We show that the total electric field in the asteroid may either be of comparable strength to the electric field predicted by Sonett et al. or vanish depending on the magnetic field geometry. We include the effects of dust grains in the gas and calculate the heating rates in the plasma flow due to ion-neutral scattering and viscous dissipation. We term this newly discovered heating mechanism “electrodynamic heating”, use measurements of asteroid electrical conductivities to estimate the upper limits of the possible heating rates and amount of thermal energy that can be deposited in the solid body, and compare these to the heating produced by the decay of radioactive nuclei like Al26.
For the second problem we modeled molecular line emission from time-dependent multifluid MHD shock waves in star-forming regions. By incorporating realistic radiative cooling by CO and H2 into the numerical method developed by Ciolek & Roberge (2013), we present the only current models of truly time-dependent multifluid MHD shock waves in weakly-ionized plasmas. Using the physical conditions determined by our models, we present predictions of molecular emission in the form of excitation diagrams, which can be compared to observations of protostellar outflows in order to trace the physical conditions of these environments. Current work focuses on creating models for varying initial conditions and shock ages, which are and will be the subject of several in progress studies of observed molecular outflows and will provide further insight into the physics and chemistry of these flows.
Graham, H. K. "Ionized calcium in health and disease". Thesis, Queen's University Belfast, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233353.
Texto completoTsamis, Ionnis. "Heavy element abundance in ionized nebulae". Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270150.
Texto completoFontana, Luis Cesar. "Nitretação ionica em aços baixo carbono". reponame:Repositório Institucional da UFSC, 1991. http://repositorio.ufsc.br/xmlui/handle/123456789/75728.
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Amostras de aço 1020 são nitretadas ionicamente num plasma de N2+ H2. São feitos estudos da evolução das camadas de nitretos em função da temperatura, do tempo de nitretação e da composição da mistura gasosa N2 + H2. No estudo da temperatura de nitretação, são nitretadas amostras durante três horas em temperaturas que variam de 400 a 600 °C . Este estudo é feito para duas composições da mistura gasosa: 80%N2 + 20%H2 e 20%N2 + 80%H2. No estudo sobre a influência do tempo de nitretação são nitretadas amostras com tempos entre 0.25h e 12.0h. Este estudo é realizado com uma única composição da mistura (80%N2 + 20%H2) e em duas temperaturas: 490 e 550°C . No estudo da mistura gasosa N2 + H2 são nitretadas amostras em 480°C durante uma hora, com misturas gasosas que variam entre 10 e 100% de N2. As camadas de nitretos formadas são analisadas por metalografia, difração de raios X e microdureza. É identificada a formação de uma camada branca de fase e -Fe2-3N e/ou g'-Fe4N . Pode haver também a formação de uma camada escura, sob a camada branca, identificada como uma mistura das fases g' e nitroferrita. A microdureza da camada branca é da ordem de 800 Vickers e a da camada escura é da ordem de 400 Vickers enquanto que a microdureza do aço 1020 não nitretado é de 200 Vickers. A espessura da camada branca, em função da temperatura de nitretação, passa por um máximo e depois decresce. Em função do tempo de nitretação, a camada branca também passa por um máximo de espessura e depois decresce, porém de maneira mais suave. A camada escura, que se forma sob a camada branca, tem um crescimento contínuo no início do processo de nitretação com tendência à saturação no final. Esta camada pode ser considerada como um estágio intermediário de decomposição da camada branca. Uma taxa de hidrogênio maior que 5%, na mistura N2 +H2, diminui a espessura da camada de nitretos e evita a formação da camada escura. A mistura de 95%N2 + 5%H2 apresenta os melhores resultados quanto a espessura e microdureza da camada de nitretos bem como da estabilidade do plasma.
Eliah, Dawod Ibrahim. "Structural integrity of highly ionized peptides". Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387886.
Texto completoPaladini, Roberta. "The Warm Ionized Gas Thin Layer". Doctoral thesis, SISSA, 2003. http://hdl.handle.net/20.500.11767/4309.
Texto completoNogueira, Viviane Carvalho. "Otimização do eletrolito polimerico baseado no complexo poli (epicloridrina-co-oxido de etileno) com NaI/I2 para celulas solares de TiO2/corante". [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248662.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
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Resumo: As células solares de TiO2 sensibilizadas por corante, DSSC, são constituídas por um filme nanoporoso de TiO2 modificado por um corante fotosensibilizador, um eletrólito no qual está presente o par redox I¨/I3¨, e um contra-eletrodo de platina. Desde 1996 o Laboratório de Polímeros Condutores e Reciclagem (LPCR) do Instituto de Química da Unicamp vem se dedicando ao desenvolvimento de células solares de TiO2/corante de estado sólido, através do emprego de eletrólitos poliméricos. A substituição do eletrólito líquido por um eletrólito polimérico visa minimizar os problemas decorrentes de vazamento ou evaporação do solvente, além de facilitar a montagem dos dispositivos. Estudos anteriores mostraram que as DSSC com eletrólito polimérico apresentam uma baixa estabilidade. Como a durabilidade de um dispositivo é um fator fundamental visando sua produção e uso em larga escala, o objetivo desta dissertação foi investigar as possíveis causas da baixa estabilidade das DSSC e otimizar a composição do eletrólito polimérico baseado em poli(epicloridrina-co-óxido de etileno), P(EO-EPI)84:16, NaI e l2, visando obter células solares com maior eficiência e estabilidade. Os resultados obtidos mostraram que a baixa estabilidade destas células está relacionada com a elevada quantidade de solvente residual presente no dispositivo após o término de sua montagem. A primeira parte do trabalho consistiu em eliminar esta interferência. O eletrólito polimérico foi otimizado através da adição do plastificante poli(etileno glicol) metil éter, P(EGME), que levou a uma redução significativa da temperatura de transição vítrea (Tg) do material polimérico, aumentando a flexibilidade das cadeias poliméricas e também participando na coordenação dos cátions Na, levando ao aumento da condutividade do eletrólito polimérico (s = 1,7 x 10 S cm, para 13 % m/m NaI). O coeficiente de difusão estimado para os íons no eletrólito polimérico com plastificante foi de 2 x 10 cms, aproximadamente 5 vezes maior do que para o eletrólito sem plastificante. A adição do plastificante não comprometeu as estabilidades térmicas, eletroquímicas e dimensionais dos filmes de eletrólito polimérico. A DSSC preparada com o eletrólito de P(EO-EPI) : P(EGME) (1:1) e 13 % (m/m) de NaI/I2 apresentou uma corrente de curto-circuito (ISC) de 1,88 mA cm e eficiência de conversão de energia (h) de 0,52 % (100 mW cm). Sob 10 mW cm, ISC = 0,60 mA cm e h = 1,75 %. Estes resultados mostram que a adição do plastificante contribuiu para melhorar o desempenho da célula solar e o estudo de estabilidade desta DSSC mostrou uma redução de menos de 15 % na eficiência de conversão de energia após 30 dias de irradiação.
Abstract: Dye sensitized solar cells, DSSC, consist of a nanoporous TiO2 electrode modified by a Ru-complex dye, an electrolyte containing the redox couple I¨/I3¨and a Pt counter electrode. Since 1996 the Conductive Polymers and Recycling Laboratory (LPCR) of the Chemistry Institute at Unicamp is developing solid state dye sensitized solar cells through the use of polymer electrolytes. The substitution of the liquid electrolyte by a polymeric one, eliminates the need of perfect sealing and avoids many problems caused by leakage or evaporation of the solvent, besides making the assembly of the cells much easier. Previous works showed that the DSSC assembled with polymer electrolytes present a poor stability. The durability of a device is a very important parameter when considering practical interests for application of DSSC, so the aim of this dissertation was to investigate the major causes of the poor stability ofthe DSSC and to optimize the composition of the polymer electrolyte based on poly(epichlorohydrin-co-ethylene oxide), P(EO-EPI)84:16, NaI and I2, in order to obtain solar cells with improved efficiency and stability. The results showed that the poor stability of the solar cells could be assigned to the presence of a large amounts of residual solvent in the assembled devices. The first step of the work consisted in eliminating this interference. The polymer electrolyte was optimized through the addition of the plasticizer, poly(ethylene glycol methyl ether), P(EGME), leading to a significant reduction of the copolymer glass transition temperature (Tg), increasing the chains flexibility, and also coordinating the Nacations, enhancing the ionic conductivity of the polymer electrolyte (s = 1.7 X 10 S cm, with 13 wt. % NaI). The diffusion coefficient estimated for the polymer electrolyte with the plasticizer was 2 x 10 cm s, about 5 times larger than for the electrolyte without plasticizer. The plasticizer did not affeet the thermal, electrochemical and dimensional stabilities of the polymer electrolyte films. The DSSC assembled with the polymer electrolyte based on P(EO-EPI) : P(EGME) (1:1) and 13 wt. % of NaI/I2 showed short circuit current (ISC) of 1.88 mA cm and overall conversion efficiency (h) of 0.52 % (100 mW cm). At 10 mW cm, ISC = 0.60 mA cm and h = 1.75 %. These results show that the plasticizer enhanced the performance of the solar cell. The stability test showed a reduction of less than 15 % in the efficiency of energy conversion after irradiating the DSSC for 30 days.
Mestrado
Quimica Inorganica
Mestre em Química
Arsenikos, Stavros. "Tectonic evolution and structure of the Cyrenaica margin, Libya (East Mediterranean )". Thesis, Cergy-Pontoise, 2014. http://www.theses.fr/2014CERG0741.
Texto completoIn the Eastern Mediterranean, the South-Tethys paleo-margin experienced poly-phased rifting episodes during Paleozoic and Mesozoic times. This margin has been subsequently inverted by discontinuous events occurring since the Late Cretaceous as a consequence of the Africa-Eurasia convergence.The Cyrenaica margin (northeast Libya) has recorded these extensional and compressional events. It thus gives the opportunity to analyse these inversion and their possible causal links with events occurring along the plate boundary (i.e. within the Hellenic subduction).The adjacent Sirt Basin, follows an oblique direction, did not suffer the same deformation as Cyrenaica and has recorded a continuous subsidence since the Mesozoic.Offshore seismic data combined with well correlations have permitted us to investigate and discuss the interactions between Cyrenaica, Sirt Basin and the deeper domains (i.e. Ionian Basin).We were able to document the different rift episodes, better constrain the compressional events on Cyrenaica, observe characteristics of the architecture of the Sirt Basin and clarify part of its evolution.Finally we integrate this part of the margin, in the regional geodynamic frame of the East Mediterranean branch of the Neo-Tethys by discussing the timing and mechanism which led to its opening
Kumar, Parveen, Ashok Kumar Shukla y Subramanian Yashonath. "Relationship between ionic radius and pressure dependence of ionic conductivity in water". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193244.
Texto completoKumar, Parveen, Ashok Kumar Shukla y Subramanian Yashonath. "Relationship between ionic radius and pressure dependence of ionic conductivity in water". Diffusion fundamentals 6 (2007) 8, S. 1-14, 2007. https://ul.qucosa.de/id/qucosa%3A14182.
Texto completoMudarri, Timothy C. "A Novel Use for Ionic Polymer Transducers for Ionic Sensing in Liquid". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9671.
Texto completoMaster of Science
Guggilla, Srinivas. "Synthesis and characterization of Perovskite-related ionic and mixed ionic-electronic conductors /". Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
Texto completoEren, Kenan. "Les sanctuaires et l'espace de l'Ionie à l'époque archaïque". Paris 1, 2009. http://www.theses.fr/2009PA010557.
Texto completoCrowhurst, Lorna. "Acidity in ionic liquids". Thesis, Imperial College London, 2006. http://hdl.handle.net/10044/1/11301.
Texto completoJohnson, Kristien Paul. "Variability of ionic magnesium". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60850.pdf.
Texto completoAnderson, K. "Hydrogenations in ionic liquids". Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411762.
Texto completoFröhlich, U. "Chirality and ionic liquids". Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426700.
Texto completoFitzgerald, A. M. "Electrochemistry in ionic liquids". Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419511.
Texto completoBrooks, C. B. "Electrochemistry in ionic liquids". Thesis, Queen's University Belfast, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401797.
Texto completoDe, La Osa Maria Jose Torres. "Characterization of ionic liquids". Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342984.
Texto completoDriver, Gordon William. "Thermodynamics of ionic liquids". Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479423.
Texto completoSangoro, Joshua, Ciprian Iacob, Rustem Valiullin, Jörg Kärger y Friedrich Kremer. "Diffusion in ionic liquids". Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-185598.
Texto completoForeiter, M. B. "Novel chiral ionic liquids". Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675450.
Texto completoHall, L. S. I. "Supported ionic liquid catalysis". Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.676492.
Texto completoNiedermeyer, Heiko Jannes. "Mixtures of ionic liquids". Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/11645.
Texto completoEngel, Brian Scott. "Studies in ionic liquids". Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501259.
Texto completoMAIS, LAURA. "Electrodeposition of Nb, Ta, Zr and Cu from Ionic Liquid for Nanocomposites Preparation". Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266571.
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