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Schmehr, Julian Leonard. "Incommensurate magnetism in UAu2." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/17958.
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The aim of this thesis was to identify a candidate material for spin-triplet superconductivity with a two-component order parameter. This unconventional superconducting state is thought to allow for exotic quantum states such as Majorana fermions. A wide survey was taken into potential candidate materials, and UAu2 was chosen for in-depth investigation. This little-studied hexagonal heavy fermion compound's unusual resistivity behaviour, combined with a series of interesting features in magnetisation and heat capacity, make it an extremely interesting material to study. The phase diagram of UAu2 was determined with measurements of heat capacity, resistivity, magnetisation and magnetoresistance on the first single crystalline samples of this material. No superconductivity was detected. Instead, a range of magnetic phase transitions were observed, which were further investigated with muon-spin relaxation experiments and time-of- ight neutron powder diffraction. UAu2 was found to undergo a transition to an incommensurate antiferromagnetic state (q1 = (1=3; 1=3; δ)) below TN = 43:5 K, but then develops signatures of weak ferromagnetism below T = 20 K. The ferromagnetism coincides with a 2q magnetic structure, with a coexistence of q1 and q2=(1/3,1/3,0). The magnetic structures of both phases were found to be most likely amplitude-modulated, with moments aligned along the crystallographic c-axis. A transition to a ferromagnetic state was observed in magnetic fields applied parallel to the c-axis. TN was found to remain almost constant in applied magnetic fields up to 9 T, while hydrostatic pressures of up to 6 kbar weakly suppress the antiferromagnetic transition temperature. The field-induced transition was found to be strongly pressure-dependent, shifting to higher applied fields with increasing pressure. The residual resistivity of UAu2 samples prepared by both the Czochralski method and quenching from the melt is relatively large, which may inhibit Cooper pairing and hence may be the reason for the absence of superconductivity in the samples investigated. Solid-state electrotransport (SSE) equipment was developed, which can induce the motion of a crystal's constituents and thereby lead to vastly improved sample quality. Refinement of UAu2 samples with SSE could be a further step in the search for spin-triplet superconductivity in this material.
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Entwisle, Oliver John. "Study of magnetic fluctuations and ordering in uranium compounds by heat capacity and neutron scattering measurements." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33143.
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URhGe is the first ferromagnet discovered that shows superconductivity at ambient pressure. It shows a rich temperature-magnetic field phase diagram with a re-emergence of superconductivity at high magnetic field where the moments rotate. This suggests that the quantum fluctuations associated with the moment rotation may provide the pairing interaction for superconductivity. The objective of this thesis was to study these critical fluctuations with inelastic neutron scattering and heat capacity measurements, using the latter to test the bulk nature of the superconductivity and determine the types of gap nodes to help test this hypothesis. To perform the heat capacity measurements, it was necessary to develop an apparatus that measures milligram samples in the temperature range 50-1000 mK, and magnetic field range 0-12 T. The field exerts a mechanical force upon the sample, which causes it to rotate, perturbing the system destructively. The apparatus developed in this thesis overcomes this diffculty by holding the sample with tensioned kevlar wires. Testing was done by making measurements on UPt3, a well characterised superconductor. It was then used to measure URhGe in zero magnetic field. The extension to measurements in high magnetic field were not performed however, due to the structural integrity of the apparatus being weak - this was in an attempt to reduce the thermodynamic signature of the background. After many iterations of apparatus design and build, the device was proved not appropriate for high fields. A discussion of the zero-field data, as well as the design and build process, is given. The Curie temperature of URhGe is suppressed with magnetic field (applied along the b-axis), reaching zero temperature at the moment rotation transition referred to above. Small angle neutron scattering (SANS) was measured at both zero and finite fields to detect the evolution and relaxation of the critical fluctuations. The scattering is inelastic and the SANS measurement integrates over energy. Nevertheless it was possible to compare models with different dynamical dependences for the magnetic relaxation. In field, however, the magnitude of the fluctuations was strongly reduced, falling below the detection limit at half the critical field. Comparing Landau damping to various forms of non-Landau damping, a result was found that agrees with that for the ferromagnetic superconductors UGe2 and UCoGe, but the lack of critical scattering at field is found to be in contradiction with NMR measurements, which is discussed. UAu2 is a new material on the heavy fermion landscape. The crystal structure found suggests some frustrated magnetism, culminating in a Neél temperature of 43 K and a further transition at 400 mK; this suggests some new quantum criticality not seen before, and so heat capacity measurements were performed with the already-tested apparatus to see if, as the resistivity measurements suggest, a Fermi-liquid state is found. Results revealed differences between annealed and non-annealed samples in their thermodynamic signature, and the behaviour expected for antiferromagnetic spin-fluctuations is found to continue to temperatures below 150 mK, suggesting the existence of a quantum critical point. The validity of these results along with implications are discussed.
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Sokol, Darren D. "Validation of COAMPS(TM)/dust during UAE2." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FSokol.pdf.
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Buskulic, Damir. "Recherche du quark top dans l'experience ua2'." Paris 6, 1989. http://www.theses.fr/1989PA066081.
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Leal, Angela Beatriz de Menezes. "Enxame de diques maficos de Uaua-Bahia: caracterização petrológica e geoquímica." Universidade de São Paulo, 1992. http://www.teses.usp.br/teses/disponiveis/44/44135/tde-28102015-101141/.
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Os diques máficos de Uauá, situado no nordeste do Brasil, destacam-se como um dos maiores e mais expressivos exames precambrianos do Craton do São Francisco. Esses diques alojam-se no Complexo Metamórfico Uauá em rochas graníticas-gnaíssicas de idade Arqueana e são representados por duas gerações. A 1ª (2.38 G.a.) subdivide-se em dois conjuntos (DMB e DA1) os quais acham-se direcionados segundo N-S; e a 2ª geração (2.0 G.a.) compreende três conjuntos (DMB1, DMB2 e DA2) direcionados preferencialmente NE-SW e, mais raramente N-S e NW-SE. Os diques tanto da 1ª como da 2ª geração, foram variavelmente metamorfisados durante o ciclo orogenético Transamazônico, variando desde uma leve recristalização (DMB e DMB1) no qual os aspectos mineralógicos e/ou texturais da rocha original estão preservados, até o fácies anfibolito (DA1 e DA2) onde observa-se completa recristalização da rocha. As temperaturas obtidas para a cristalização dos piroxênios e plagioclásios nos leva a admitir que o magma atingiu, no mínimo, temperaturas da ordem de 1200ºC, ao passo que os valores obtidos para os anfibólios indicam que provavelmente a temperatura do metamorfismo foi em torno de 600-650ºC. As composições químicas de rocha total demonstraram que não houve remobilização significante dos elementos maiores, menores e traços entre os conjuntos, excetuando o \'Al IND. 2\'\'O IND. 3\', \'K IND. 2\'O, Ba e Rb para os diques mais transformados (DA1 e DA2) em relação aos DMB1. De modo geral, os dados químicos de elementos maiores, os constituintes minerais e os aspectos petrográficos, principalmente dos DMB1 e DMB2, revelaram que os diferentes conjuntos de diques (1ª e 2ª gerações) são predominantemente básicos (toleítos e subordinadamente transicionais) e de natureza toleítica. Do ponto de vista petroquímico, não se observa variações químicas significativas entre os conjuntos. Geralmente as concentrações dos elementos incompatíveis são baixas, excetuando-se algumas amostras dos DMB1, DMB2, DA1 e DA2 que mostram conteúdos mais elevados de Ba, Rb, Sr e K. Os diagramas de variação química para os elementos maiores, menores e traços, sugerem que a diferenciação ocorreu com o fracionamento de uma assembléia mineral do tipo gabro. O fato dos conjuntos de diques estudados não apresentarem diferenças significativas na concentração dos elementos incompatíveis (Zr, La, Ce, Ti e P) sugere que o processo de geração das rochas foi o de cristalização fracionada, a partir de uma fonte mantélica química e isotopicamente homogênea. Determinações dos isótopos de Sr dos diques máficos de Uauá, existentes na literatura, apresentaram as seguintes valores de razões iniciais \'ANTPOT. 87 Sr\'/\'ANTPOT. 86 Sr\' (Ro): Para os diques da 1ª geração (DMB) = 0.7008 e para os da 2ª geração (DMB1) três conjuntos distintos variando de 0.7007 a 0.7081. Os diques máficos da 1ª geração foram gerados possivelmente a partir de uma fonte mantélica química e isotopicamente empobrecida em elementos LIL e Rb-Sr. Por outro lado, estudos isotópicos mostram que a contaminação crustal assumiu um papel importante nas características petroquímicas de alguns diques da 2ª geração, mas que foi insignificante em outros corpos.The mafic dykes which occur in the Uauá region, northeastern Brazil, represent one of the hugest and most expressive swarms of Precambrian age crosscutting the São Francisco Craton. These dykes are set in Archaean granitic-gnaissic rocks of the Uauá Metamorphic Complex and are of two generations. The first (2.38 Ga) is divided in two groups (DMB and DA1), with N-S trend; the second (2.00 Ga) is divided in three groups (DMB1, DMB2 and DA2) of NE-SW predominant and N-S and NW-SE secondary directions. Both first and second generation dykes were metamorphosed during the Transamazonic Orogenic Cicle, from a mild recrystallization (DMB and DMB1), such that texture and mineralogical characteristics are still preserved, to the amphibolite facies (DA1 and DA2), when a complete recrystallization occurred. The temperatures obtained for pyroxene and plagioclase crystallization suggest that the magma reached, at least, 1200ºC, whereas the values obtained for amphiboles indicate that probably the metamorphism temperatures were around 600-650ºC. The bulk rock chemical compositions showed that there was no significant remobilization of majores, minores and traces elements between the groups, except in more transformed dykes (DA1 and DA2) for \'Al IND. 2\'\'O IND. 3\', \'K IND. 2\'O, Ba and Rb, in relation to DMB1. Generally speaking, major element chemical data, mineral constituents and petrographic aspects, especially for DM1 and DM2, showed that both dyke groups (first and second generations) are predominantly basic (tholeiites and subordinately transitional) and of tholeiitic nature. From the petrochemical point of view, significant chemical variations between the two groups are not observed. Generally, incompatible elements concentrations are low, except for some DMB1, DMB2, DA1 and DA2 samples which show higher Ba, Rb, Sr and Sr contents. Chemical variation diagrams for major, minor and trace elements indicate that fractionation of a mineral assembly of the gabbro type occurred. The fact that the dyke groups do not show significant differences in incompatible elements concentration (Zr, La, Ce, Ti and P) suggest that the generation process was fractional crystallization from a chemically and isotopically homogeneous mantle source. From Sr isotope determinations an initial \'Sr POT. 87\'/\'Sr POT. 86\' ratio (Ro) of 0.7008 was obtained for the first generation dykes (DMB). For the second generation dykes (DMB1) three groups are distinguished have values in the range 0.7007-0.7081. The dykes from the first generation were possibly generated from a chemically and isotopically depleted mantle source in LIL elements and Rb-Sr. On the other hand, isotopic studies show that crustal contamination played an important role in the petrochemical characteristics of the second generation dykes, but was insignificant in other bodies.
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Unal, Guillaume. "Mesure de la masse du w avec ua2." Paris 11, 1991. http://www.theses.fr/1991PA112086.
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Cette these decrit la mesure de la masse de boson intermediaire w avec l'experience ua2 aupres du collisionneur proton-antiproton du cern. La premiere partie discute l'importance de la mesure de la masse du w dans le cadre du modele standard, au niveau des corrections radiatives. Dans la seconde partie, nous decrivons le dispositif experimental utilise, concu pour une bonne identification des electrons, une bonne mesure de leur energie par calorimetrie et une bonne mesure de l'impulsion transverse manquante. Nous decrivons ensuite la selection des evenements w et z se desintegrant en electron-neutrino et electron-positron, utilises pour la mesure des masses de ces deux bosons intermediaires. La methode utilisee pour extraire la masse du w est decrite en detail, en particulier les informations donnees par l'etude des evenements z. Les valeurs obtenues pour les masses du w et du z sont donnees apres discussion des erreurs systematiques. L'incertitude principale provenant de l'incertitude sur l'echelle d'energie disparait dans le rapport des masses. Cette valeur combinee a la mesure de la masse du z a lep nous permet d'obtenir une determination precise de la masse du w. M#w=80. 490. 37 gew/c#2. Les implications de cette mesure sur les parametres du modele standard sont discutees dans la derniere partie
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Wotton, Stephen Andrew. "Prompt photon identification using the upgraded UA2 central detector." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316773.
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Sampaio, Wany Bernadete de Araujo. "Estudo comparativo sincronico entre o Parintintin (Tenharim) e o Uru-eu-uau-uau (Amondava) : contribuições para umarevisão na classificação das linguas tupi-kawahib." [s.n.], 1998. http://repositorio.unicamp.br/jspui/handle/REPOSIP/268950.
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Orientador: Tania AlkminDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Estudos da Linguagem
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Resumo: Esta dissertação apresenta um estudo comparativo preliminar, sob o ponto de vista sincrônico, entre as línguas Tupi-Kagwahib: Parintintin (Tenharim) e Uru-euuau..,uau (Amondava). O Parintintin (Tenharim) é falado por cerca de duzentos e oitenta indígenas, localizados na região sul do estado do Amazonas. O Uru-eu-uau-uau possui cerca de 129 falantes distribuídos em cinco sub-grupos, na região central do estado de Rondônia, entre os quais figura o subgrupo Amondava. O trabalho divide-se em três capítulos: o primeiro deles traz informações acerca da bibliografia etnográfica e lingüística disponível sobre os povos Parintintin (Tenharim) e Uru-eu-uau-uau (Amondava). O segundo desenvolve uma análise comparativa entre a fonologia Parintintin (Tenharim) e Uru-eu-uau-uau (Amondava). Caracteriza-se este capítulo, também, por apresentar uma descrição preliminar da fonologia Uru-eu-uau-uau. O terceiro capítulo mostra um estudo comparativo lexical entre as línguas em questão. Procuramos, através deste estudo, verificar se o Uru-eu-uau-uau (Amondava) e o Parintintin (Tenharim) são línguas diferentes entre si ou se são variedades de uma única língua. Com isto, esperamos contribuir para com os estudos comparativos entre as línguas da família Tupi-Guarani, bem como para com uma revisão na classificação das línguas do grupo Tupi-Kawahib
Abstract: This dissertation presents a comparative synchronal study between Tupi-Kagwahib languages: Parintintin (Tenharim) and Uru-eu-uau-uau (Amondava). Parintintin (Tenharim) language is used by almost 280 speakers, in the south of Amazonas. Uru-eu-uau-uau (Amondava) is spoken by about 129 indians, in the central area of Rondônia. This work has three chapters: the first presents a brief account on the bibliographlc material that is related to Uru-eu-uau-uau, Amondava, Tenharim and Parintintin groups. The second presents a preliminary comparison between Tupi-Kawahib languages at the phonologyc level. The third one shows a lexical comparision. This work shows us that Parintintin, Tenharim, Uru-eu-uau-uau and Amondava are just dialectal varieties of one single language: the Kagwahib
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Iconomidou-Fayard, Lydia. "Production et étude des propriétés des bosons intermédiaires, expérience UA2." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37598426s.
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Mani, Peter. "Suche nach freien Teilchen mit gebrochener Ladung im UA2 Experiment /." [S.l : s.n.], 1985. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
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Iconomidou-Fayard, Lydia. "Production et étude des propriétés des bosons intermédiaires : expérience UA2." Paris 11, 1986. http://www.theses.fr/1986PA112186.
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Dans cette thèse, on présente les résultats concernant les propriétés des bosons intermédiaires, mis en évidence par l’expérience UA2. Toute l’analyse «électron» est présentée et les échantillons finals des W et Z, correspondant à dt = 863 nb⁻¹, sont également donnés. Le moment longitudinal des bosons est plus particulièrement étudié et les distributions en impulsion des partons-parents sont évaluées. Dans le centre de masse des W, la distribution angulaire des leptons chargés issus de la désintégration (électrons ou positrons) est en accord avec la forme théorique prédite par le Modèle Standard et corrigée par les effets QCD. Les sections efficaces des processus W→ev et Z→e⁺e⁻ sont mesurées ainsi que les masses des bosons intermédiaires. Les paramètres sin²0w et p sont évalués. L’accord avec les prédictions du Modèle Standard est bonWe present here some results concerning the properties of IVB’s detected by the UA2 experiment. The “electron-identification” criteria are discussed and the final samples of W’s and Z’s, corresponding to a total integrated luminosity of 863 nb⁻¹, are given. A particular study of longitudinal motion of bosons has been done and the momentum distribution of “parent-partons” has been evaluated. In the W’s center of mass frame, the angular distribution of the outgoing changed lepton (electron or positron) is in good agreement with the theoretical shape expected from the Standard Model and QCD corrections. The cross-sections of processes W→ev and Z→e⁺e⁻ and the masses of IVB’s are measured. The values of sin²0w and p are evaluated. A good agreement with standard model is observed
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Tsang, Wai Yeung. "Hadronic jet production at the CERN UA2 detector : an experimental test of QCD." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254216.
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Ansari, Foumani Mohammed Reza. "Recherches de particules supersymétriques avec le détecteur UA2 au collisionneur pp̄ du cern." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37602269c.
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Ansari, Foumani Mohammed Reza. "Recherches de particules supersymétriques avec le détecteur UA2 au collisionneur PP du CERN." Paris 11, 1987. http://www.theses.fr/1987PA112170.
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Les théories supersymétriques prédisent l'existence de nouvelles particules, associées aux fermions et bosons présents dans le modèle standard : des particules scalaires associées aux fermions, et des particules de spin 1/2, associées aux bosons de spin 1 ou 0. Les paramètres inconnus de la théorie sont des masses de ces particules. Nous avons recherché un éventuel signe d'existence de ces nouvelles particules, en utilisant les données prises au collisionneur pp du CERN avec le détecteur d'UA2. L'étude des désintégrations du boson vecteur Z en paires d'électrons scalaires, et en paires de winos nous ont permis de sonder les masses de celles-ci. Les électrons scalaires d'une masse inférieure à 29 GeV/c² (pour un photino de masse nulle) ainsi que des winos d'une masse inférieure à 45 GEV/c² (pour un neutrino scalaire de masse nulle) sont incompatibles avec nos données. Nous excluons aussi l'existence d'un quark scalaire d'une masse comprise entre 9 et 46 GeV/c², ainsi que des gluinos d'une masse supérieure à 15 GeV/c² et inférieure à 50 GeV/c² dans le cas d'un photino instable. Le domaine de masse exclue est moins étendu dans le cas d'un photino stable. Un nouveau boson vecteur Z d'une masse inférieure à 180 GeV/c² ou un W' d'une masse inférieure à 209 GeV/c² sont incompatibles avec nos donnéesSupersymetric theories predict the existence of new particles, partners of ordinary matter : scalar particles associated to fermions, and new spin 1/2 particles, partners of spin 0 or 1 ordinary bosons. The masses of these particles are unknown parameters of the theory. We have searched for a possible sign of existence of these new particles using the data taken by the UA2 detector at the CERN pp collider. We have tested scalar electron and wino masses through the study of the decay of the Z boson into these particles. Scalar electrons with masses below 29 GeV/c² (for a massless photino), and winos below 45 GEV/c² (for massless scalar neutrinos) are not compatible with our data. We exclude also scalar quark masses in the range of 9 to 46 GeV/c², and gluino masses above 15 GeV/c² and below 50 GeV/c² in the case of an unstable photino. The limits are however less restrictive if the photino is stable. A new vector boson Z' below 180 GeV/c² or W' below 209 GeV/c² are incompatible with our data
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Alcântara, Denilson Moreira de. "Entre a forma espacial e a racionalidade jurídica - Comunidade de Fundo de Pasto da Fazenda Caldeirãozinho, Uauá-BA." Universidade Federal da Bahia, Instituto de Geociências, 2011. http://repositorio.ufba.br/ri/handle/ri/19794.
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As Comunidades de Fundo e Fecho de Pasto integram o campo baiano há mais de um século. O surgimento destas comunidades tem como início o período colonial a partir da expansão da criação extensiva de gado para o interior. Inicialmente, se caracteriza pela fronteira do gado solto. Enquanto forma, esta organização socioespacial se concretizou com o abandono das terras até então ocupadas no semiárido. Possuem um modo de vida marcado pelo uso de terra comum articulado com parcela de uso individual, regulado pelo direito consuetudinário e encontram-se espacializadas no nordeste, norte, noroeste e oeste do estado da Bahia. Estas comunidades passaram a sofrer um processo de pressão expropriatória em função do modelo de desenvolvimento implementado pelo Estado, que reestrutura o espaço, realizando obras de infra-estrutura; expedindo licença para a extração de minério; removendo populações que ocupam tradicionalmente uma dada área, possibilitando uma ação mais efetiva do capital que se instala no campo através da implantação de agroindústrias, mineradoras, ferrovias, entre outros projetos, abrindo o caminho para a inserção destas áreas no mercado global. A resistência deste grupo social ao processo expropriatório resultou em conflitos violento e em 1989, na Constituição Baiana, esta organização socioespacial foi reconhecida com um artigo 178 que a configurou enquanto forma jurídica. O presente trabalho investigou a contradição existente entre a forma espacial oriunda do modo de vida na comunidade de Fundo de Pasto Caldeirãozinho e o processo de regularização desenvolvido pelo Estado da Bahia, tendo como base o argumento que estes conflitos são resultados da produção capitalista do espaço que se dá de forma contraditória e combinada.
ABSTRACT The Fundo and Fecho de Pasto communities have made part of the fields in Bahia for more than one century. The appearing of these communities began in the colonial period in the beginning of the extensive breeding of cattle expansion toward the countryside. Initially, it was characterized by the free cattle boundaries. As form, this socio-spacing organization was built through the abandonment of lands that were possessed in the semiarid area. They have a way of life that is characterized by the common land use articulated with the individual use parcel, it is controlled by the common law and they are in northeast, north, northwest and west of Bahia state. These communities began to stand the pressure of a proprietary rights process because of its model of development implemented by the State, which rebuilds the space through infrastructure works; giving license to the mineral extraction; transferring the inhabitants that traditionally live in a particular area; and enabling a more effective action with the capital that are used in the countryside through the agro industry, miner, railroads and many others implantations, which make possible the insertion of these areas in the global market. This social group resistance of a proprietary rights process resulted in violent conflicts and in 1989, in the Constitution of Bahia, this socio-spacing organization were recognized through the article 178 that configured it as a legal form. This research investigated the incoherence between the space form originated from the way of life of Fundo de Pasto Caldeirãozinho community and the process of regularizing developed by the government of Bahia, considering the argument that these conflicts are the result of a capitalist production of space that happened in a contradictory and combined way.
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Moniez, Marc. "Recherche du quark top auprès du détecteur UA2 au collisionneur proton-antiproton du Cern." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37616647b.
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Moniez, Marc. "Recherche du quark top auprès du détecteur UA2 au collisionneur proton-antiproton du CERN." Paris 11, 1988. http://www.theses.fr/1988PA112214.
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Cette thèse expose les résultats de la recherche du quark top à l'expérience UA2 du CERN, dans les collisions proton-antiproton aux énergies de 546 GeV et 630 GeV dans le centre de masse, pour une luminosité intégrée de 894 nb-1. Un signal provenant de la désintégration semi-leptonique du quark top (t donne b +électron+ neutrino) a été recherché dans les ensembles d'événements qui contiennent un électron identifié dans l'appareillage et 0,1 ou 2 jets. L'étude détaillée des bruits de fond expérimentaux dus à une mauvaise identification des électrons a été menée ; de même, les sources connues d'électrons réels ont été évaluées à l'aide d'un programme de simulation. Compte tenu de ces études et de la simulation de la production de quark top, une analyse statistique des événements avec 1 électron et 2 jets a permis une discussion sur l'établissement d'une limite inférieure pela masse du quark top. Une limite supérieure sur la production de quark top par le processus (proton-antiproton donne top-antitop) est donnée en fonction de la masse du top. L'extrapolation des études de bruits de fond et de production est développée pour l'expérience UA2' et il est estimé que cette expérience sera en mesure de découvrir le quark top si sa masse est inférieure à 70 GeVfc2.
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Ribeiro, Ricardo dos Santos. "A presença do nitrato nos aquiferos cristalinos, do alto da bacia hidrografica do Vaza-Barris, região de Uauá, Bahia, Brasil." Instituto de Geociências, 2017. http://repositorio.ufba.br/ri/handle/ri/26186.
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RESUMO A área de estudo (Uauá) pertence ao domínio dos aquíferos fraturados do embasamento cristalino, correspondente oas Gnaisses-migmatitos e intrusões máficas, inseridos na região semi-árida da Bahia, com índice pluviométrico inferior a 800 mm/ano. A concentração de nitrato (NO3-) na água representa riscos à saúde, segundo a portaria 2.914/2011 do Ministério da Saúde, a qual informa que, concentrações de nitrato acima de 10mg- N/L podem provocar riscos à saúde humana. Ao ingerir concentrações elevadas de nitrato, os indivíduos podem desenvolver doenças como: metamoglobilemia (capacidade da hemoglobina de transportar oxigênio é bloqueada pelos nitritos que são causadas pela conversão de nitratos no estômago), câncer de estômago, distúrbios reprodutivos (CAR E NEARY; 2008). Além disso, concentrações elevadas de nitrato em água são consideradas laxantes, causando desenterias quando ingeridas em quantidade significativas pela população. Esta pesquisa foi subdividida em três parte: a fase pré-campo, fase campo e pós-campo. A primeira etapa (fase pré-campo) foi realizada o levantamento dos dados e catalogação dos poços tubulares, alvo de estudo. Nesta fase, separou-se 76 poços, que apresentaram os maiores teores de nitrato coletados por Andrade, em 2010. Desses 76 poços, foram separados 10 poços com percentual de nitrato acima de 40 mg/L. Também foram separados 44 poços que apresentaram todos os parâmetros utilizados pelo programa Qualigraf. Na segunda fase desenvolveu-se o trabalho de campo com coleta de amostras, e na fase seguinte foi desenvolvido as interpretação e interpolação dos dados adquiridos. Essa pesquisa apresenta duas linhas de investigação, a primeira com relação a contaminação do nitrato nas águas subterrâneas e, a segunda relacionada as intrusões máficas da região, cujos poços tubulares apresentaram água considerada doce. Os dados indicaram que a presença do nitrato nas águas subterrâneas está intimamente ligada à criação de caprinos e ovinos, pois as fezes desses animais são ricas em nitrogênio. Esses animais de fácil adaptação na região semi-árida, são o forte do comércio local. Em relação aos diques máficos, os dados mostraram que, nos ambientes próximos aos corpos filonianos, ocorre um intenso sistema de fraturas, o que facilita a circulação dos fluidos e, consequentemente, u m a menor salinização das águas subterrâneas.
ABSTRACT - The study area (Uauá) belongs to the domain of fractured aquifers of the crystalline basement, corresponding to the Gneisses-migmatitos and mafic intrusions, inserted in the semi-arid region of Bahia, with a rainfall index of less than 800 mm / year. The concentration of nitrate (NO3-) in the water poses a health risk, according to Ministry of Health ordinance 2,914 / 2011, which informs that nitrate concentrations above 10mg-N / L can cause risks to human health. By ingesting high concentrations of nitrate, individuals may develop diseases such as: methemoglobilemia (hemoglobin's ability to transport oxygen is blocked by nitrites that are caused by the conversion of nitrates in the stomach), stomach cancer, reproductive disorders (CAR AND NEARY, 2008) . In addition, high concentrations of nitrate in water are considered laxatives, causing dysentery when ingested in significant quantities by the population. This research was subdivided into three parts: the pre-field phase, the field phase and the post-field phase. The first stage (pre-field phase) was carried out the data collection and cataloging of the tubular wells, target of study. In this phase, 76 wells, which had the highest nitrate levels collected by Andrade, were separated in 2010. Of these 76 wells, 10 wells with a nitrate percentage above 40 mg / L were separated. Also 44 wells were separated that presented all the parameters used by the Qualigraf program. In the second phase the fieldwork was developed with sample collection, and in the next phase the interpretation and interpolation of the acquired data were developed. This research presents two lines of investigation, the first with respect to nitrate contamination in groundwater, and the second related to the mafic intrusions of the region, whose tubular wells presented water considered sweet. The data indicated that the presence of nitrate in groundwater is closely linked to the breeding of goats and sheep because the faeces of these animals are rich in nitrogen. These animals of easy adaptation in the semi-arid region, are the strongest of local commerce. In relation to the mafic dikes, the data showed that, in environments close to the phonon bodies, an intense system of fractures occurs, which facilitates the circulation of the fluids and, consequently, less salinization of groundwater. Key words: nitrate, contamination, nitrogen, salinity, crystalline aquifer.
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Lefebvre, Michel. "Electron detection and W boson production in 630 GeV pp interactions at the upgraded UA2 detector." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305632.
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Simplicio, Maria Araguacy Rodrigues. "O emprego de sistema de informação geo-referencia da (SIG) na identificação dos corpos maficos-ultramaficos da região de Uaua-Bahia." [s.n.], 1995. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287524.
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Orientadores: Ardemirio de Barros Silva, Elson Paiva OliveiraDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociencias
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Resumo: A análise baseada em Processamento Digital de Imagens Sistemas de Informação Geo-Referenciada (SIG) foi empregada para co-registrar e analisar o banco de dados, composto de imagens Landsat TM, dados aerogeofisicos, mapas geológicos e topográficos da região de Uauá, nordeste do estado da Bahia. Este estudo foi realizado para identificar os corpos máficos-ultramáficos conhecidos e auxiliar na localização de outros eventualmente não mapeados visto que, em regiões continentais, esses corpos são importantes repositórios de recursos minerais, valiosos indicadores de ambientes geológicos e excelente objeto para o estudo de processos magmáticos. Para tanto, usou-se a integração de dados geológicos, aerogeofisicos e landsatITM, com o auxilio da metodologia de Sistema de Informação Geo-Referenciada (Grass4.1) Para alcançar o objetivo, a sistemática adotada foi a seguinte: iniciou-se com uma pesquisa na literatura, destacando-se o posicionamento geotectônico, revisão dos trabalhos existentes, com ênfase a rochas máficas-ultramáficas e suas ocorrências minerais associadas. Em seguida, foi realizada uma análise dos dados disponíveis, sendo posteriormente transformados para um formato digital compatível com o Sistema de Informação Geo-Referenciada usado, sendo portanto, nessa fase aplicadas técnicas de controle do erro operacional envolvido no processo de captura dos dados. O Processamento Digital de Imagens constitui uma fonte adicional de informações, revelando subsídios valiosos para a execução do trabalho de campo, facilitando a visualização de feições espectrais, estruturas geológicas e mostrando uma melhor compartimentação geotectônica da área. O comportamento dos dados aerogeofísicos permitiu caracterizar as unidades magnéticas, refletindo a presença de terrenos máficos, constituindo um importante auxilio para o mapeamento geológico. Tomou-se possível mapear ocorrências de rochas graníticas visto que em determinadas regiões exibem os mais elevados níveis radiométricos de K, U e Th. Desses dados, áreas anômalas foram definidas e a partir de então, foi aplicada a fusão, selecionando-se áreas com a presença de rochas máficas-ultramáficas que apresentaram fatores geológicos condicionantes a mineralizações, recomendando-se portanto, que investigações geológicas futuras sejam realizadas
Abstract: employed to co-register and analyse the data base, made up by landsatITm images, aerogeophysics data, geological and topographie maps from Uauá region, northeastem of Bahia, Brazil. This study attempts to identify the known mafic-ultramafie bodies and to contribute for localization of other bodies eventually not found, since these bodies are important host of mineral resources, goOO indicator of geologieal enviroments and excellent subjects for the magmatie processes study, in continental regions. In this way, it was used the integration of geological, aerogeophysics and LandsatfTM data, through the methodology of Geo-Refereneed Information Systens (GIS). To reaeh the objective, the following methodology was adopted: inicially, the geological study of the region was done, with emphasis in the geotectonics, together with a review in previous works, specially the ones related to mafic-ultramafie rocks and their mineral occurrences associated. The next phase consisted of analysis of the available data, that were transformad to a digital format compatible with the GIS used. Operational error teehniques involved in the data eapture process W8re employed in this phase. The image digital processing constitutes an aditional source of informations, revealing important subsides for the field work, becoming it easily to visualize the spectral features, geological structures and showing a better geotectonie compartiment of the area. The behavior of aerogeophysics data led to the eharacterization of magnetie units, showing the presenee of mafic terrains, constituing an important instrument to the geological mapping. It was possible to show the granitie rocks occurrences in some regions through the most elevated radiometrie levels of U, K e Th. From these data, anomalous areas W8re defined and the subsequent fusion selected areas of mafic-ultramafie rocks with favorable geological factors to mineralizations, suggesting geoIogical investigations in the next Mure
Mestrado
Metalogenese
Mestre em Geociências
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Silva, Débora Rodrigues da. "Redes de economia solidária e comércio justo: o caso da Cooperativa Agropecuária Familiar, Uauá e Curaça (COOPERCUC) no semi árido baiano." Escola de Administração da Universidade Federal da Bahia, 2010. http://repositorio.ufba.br/ri/handle/ri/19629.
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ideia de que as práticas das redes de economia solidária são fomentadoras do desenvolvimento local, à medida que fortalecem os empreendimentos; possibilitam a formação dos sujeitos sociais e fomentam a valorização e o aproveitamento das potencialidades locais, favorecendo o desenvolvimento de processos de produção apropriados aos territórios, tem adquirido força entre os atores do movimento da economia solidária e teóricos da temática. Nessa perspectiva, este estudo busca compreender e identificar as conexões e os fluxos existentes nas articulações em redes de economia solidária e de comércio justo presentes nas práticas da Cooperativa Agropecuária Familiar de Canudos, Uauá e Curaçá - COOPERCUC e na sua articulação na Rede O Sabor Natural do Sertão, considerando os elementos potencializadores do desenvolvimento local. A abordagem da temática da economia solidária, redes de economia solidária, comércio justo e desenvolvimento local, aqui elaborada, está fundamentada em Singer ( 1998 e 2002), Gaiger (2002 e 2004), França Filho (2001, 2006 e 2009); Mance (2002) e Silva ( 2008 e 2009) e serve como base para a análise da experiência da COOPERCUC, cooperativa de 141 agricultores e agricultoras familiares, localizada no Estado da Bahia, que trabalha na produção de compotas, doces e geléias de frutas nativas da região semiárida. O estudo destaca os avanços e desafios presentes nessa experiência e busca refletir sobre as redes de economia solidária como elemento de fortalecimento dos empreendimentos econômicos solidários e o seu potencial de apoio ao desenvolvimento local. The notion that the practices of the networks of solidarity economy foster local development has gained strength among members of the solidarity economy movement as well as theoreticians of this field, as they reinforce enterprises, enable the formation of social subjects and foster the valorization and the utilization of local potential, favoring the development of production processes which are adequate to territories. Within that perspective, this study seeks to understand and identify the connections and the flux that permeates articulations in networks of solidarity economy and fair commerce which are present in the practices of the Cooperative of Family of Agriculture and Cattle Raising of Canudos, Uauá and Curaçá – COOPERCUC and its articulation in the Network “The Natural Flavor of the Sertão (Hinterlands), considering the empowering elements of the local development. The theoretical framework utilized in this study of solidarity economy, solidarity economy networks, fair commerce and local development is grounded on Singer Singer (1998 e 2002), Gaiger (2002 e 2004), França Filho (2001, 2006 e 2009); Mance (2002) e Silva (2008 e 2009). It also grounds the analyses of the experience of COOPERCUC, a cooperative that congregates 141 family agricultural workers and cattle raisers, located in the state of Bahia, a cooperative that produces candy, jelly, and compotes with regional fruit from the semi-arid region. The analysis highlights the advances and challenges present within this experience, seeking to reflect upon the networks of solidarity economy as a strengthening element of solidarity economy enterprises and its potential for supporting local development.
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Bourliaud, Martial. "Etude de la production de photons à grande impulsion transverse dans les collisions hadroniques avec le détecteur UA2'." Aix-Marseille 2, 1995. http://www.theses.fr/1995AIX22101.
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Nous etudions la production inclusive de photons a grande impulsion transverse et a faible pseudorapidite dans les collisions hadroniques. Nous presentons deux analyses originales realisees sur 13 picobarn moins un de collisions proton-antiproton collectees par la collaboration ua2' aupres du collisionneur spps du cern. Qcd predit que ces photons sont soit emis par les quarks lors des interactions a grand moment de transfert (photons directs), soit crees par bremsstrahlung lors de la fragmentation des jets. La section efficace totale de production de ces photons a ete pour l'essentiel calculee a l'approximation des logarithmes sous-dominants, avec toutefois des incertitudes sur la proportion de photons de bremsstrahlung aux faibles valeurs de x#t. Du point de vue experimental les photons offrent l'avantage d'etre bien mieux mesures que les jets, et nos mesures constituent des tests du modele des partons de qcd. Les predictions theoriques et les applications importantes de la production hadronique de photons et de paires de photons a grande impulsion transverse, sont passees en revue dans les chapitres 1 et 2 de cette these. Les caracteristiques principales du detecteur ua2' sont ensuite presentees au chapitre 3, ainsi que les algorithmes de la reconstitution des evenements en relation avec les analyses au chapitre 4. Au chapitre 5, une analyse minutieuse de la section efficace inclusive des photons a grande impulsion transverse est realisee sur un echantillon extrait des donnees de la collaboration ua2'. Elle fait appel a la methode dite du taux de conversion pour calculer le bruit de fond hadronique. Au chapitre 6, une mesure de la section efficace des paires de photons de grande masse invariante est presentee, avec une estimation du bruit de fond hadronique se basant cette fois sur le profil transverse des gerbes electromagnetiques. En conclusion, nous obtenons un bon accord de nos mesures avec les predictions theoriques de qcd a l'ordre des logarithmes sous-dominants dans le domaine de tres grande impulsion transverse domine par les photons directs. Par contre, dans le domaine ou x#t est inferieur a 6. 10#-#2, un desaccord se manifeste, aussi observe dans d'autres experiences. Les causes possibles de ce desaccord, encore debattues seraient une contribution plus forte que prevue des photons de bremsstrahlung ou bien la manifestation de l'impulsion transverse primordiale des partons au moment de leur interaction, sur laquelle on possede encore peu d'informations. Notre mesure de la section efficace des paires de photons de grande masse invariante est en bon accord avec les predictions de qcd
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Leal, Luiz Rogério Bastos. "Geocronologia \'RB\'-\'SR\' e k-\'AR\', evolução isotópica e implicações tectônicas dos enxames de diques máficos de Uaua e Vale do Rio Curaca, Bahia." Universidade de São Paulo, 1992. http://www.teses.usp.br/teses/disponiveis/44/44134/tde-26102015-110329/.
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Este trabalho visou avaliar e propor alternativas de investigação geocronológicas nas rochas básicas pré-cambrianas, particularmente em enxames de diques máficos. Como aplicação foram efetuadas análises isotópicas k-Ar, Rb-Sr e Sm-Nd nos diques máficos de Uauá e Vale do rio Curaçá, situados na região norte do estado da Bahia. Complementarmente, são apresentados também novos dados geocronológicos K-Ar e Rb-Sr para as rochas gnáissicas da região de Uauá. Além de proceder-se a reinterpretação dos dados geocronológicos das diversas unidades litológicas da porção centro norte do estado da Bahia, fundamentando assim, a modelagem tectônica. As rochas gnáissicas da região de Uauá possuem composição tonalítica a granodiorítica, apresentam idade de formação entre 3,1-3,0 G.a., tendo sido deformadas e metamorfisadas há 2,7 G.a. atrás e durante o ciclo Transamazônico (2,2-1,8 G.a.). De acordo com os dados geocronológicos, as rochas que compõem o Complexo Caraíba, aflorantes na região do Vale do rio Curaçá, tiveram a sua evolução crustal (formação, metamorfismo e deformação) especialmente centrada no Proterozóico Inferior, entre 2,3-2,15 G.a.. O enxame de diques máficos de Uauá é caracterizado por duas gerações, a primeira com idade de 2,38 G.a. e a segunda com idade de aproximadamente 2,0 G.a.. Estes diques foram variavelmente deformados e metamorfisados pela orogenia Transamazônica entre 2,0-1,9 G.a. atrás, especialmente nos setores marginais ao enxame. Com base nos dados isotópicos de Sr, os diques da primeira geração derivaram de uma fonte mantélica empobrecida na razão Rb/Sr, enquanto que para aqueles da segunda geração, os dados isotópicos de Sr e Nd revelaram uma gênese a partir de uma fonte mantélica levemente enriquecida em Rb X Sr e Nd x Sm. Possivelmente, este diques foram diferentemente contaminados por materiais crustais mais antigos durante sua colocação na crosta continental. Os diques máficos da primeira geração se formaram num regime tectônico precoce (anorogênico) no Proterozóico Inferior associados ao desenvolvimento de fraturas extencionais, ao passo que os da segunda geração se formaram durante a evolução do ciclo geotectônico Transamazônico. Os diques máficos do Vale do rio Curaçá intrudiram a crosta continental há aproximadamente 650-700 M.a. atrás, tendo sido derivados de uma fonte mantélica enriquecida em Rb X Sr e Nd X Sm. Estes diques não apresentam indícios de metamorfismo e deformação e representam um magmatismo intracontinental, interpretado aqui como reflexo da evolução do Sistema de Dobramentos Sergipano, marginal ao Craton do São Francisco, durante o ciclo Brasiliano.This research deals with the evaluation of alternative geochronological techniques applied for Precambrian mafic dykes. Rb-Sr, Sm-Nd and K-Ar methods were performed on mafic dykes belonging to the swarms of Uauá and Curaçá river Valley, both located in the north of the state of Bahia Besides, integration of radiometric data for the basement rocks is presented in order to establish the main tectonic events of the investigated area, as well as their relationships with the emplacement of the studied mafic dyke swarms. The gneissic basement rocks of Uauá region (Uauá metamorphic complex), tonalitic to granodioritic in composition, yielded an age between 3, 1 - 3, 0 G.a. for their formation. Later, they were deformed and metamorphosed at 2, 7 G. a. ago and eventually during the Transamazonico cycle (2, 2-1, 8 G. a.). On the other hand the formation and metamorphism of the basement rocks belonging to the Caraíba Complex are mainly associated to the Lower Proterozoic (2, 3 to 2, 15 G.a.). The mafic dyke swarm of Uauá which cuts the Uauá metamorphic Complex reveals two distinct generations of dykes, as supported by the geochronological data: the first one with Rb-Sr isochron age of 2, 38 G.a and the second with Rb-Sr isochron age of c. 2, 0 G.a.. Both generations of dykes were variable deformed and metamorphosed during the Transamazonico orogeny, but in special along the marginal sector of the Uauá dyke swarm. The first generation Uauá dykes may be originated from a mantle source depleted in Rb X Sr, as suggested by Sr isotopic evidences. For the second generation of dykes Sr and Nd isotopic evidences point to a slightly enriched mantle source for its origin. Nevertheless these younger dykes may be partially contaminated by crustal material because of their extreme high Sr/Sr ratios. The first generation dykes are interpreted as anorogenic, associated with extension factures of the crust, which developed during the beginning of the Lower Proterozoic. The second generation dykes are clearly related to the evolution of the Transamazonico cycle, on the basis of field evidences and geochronology. The Curaçá river Valley dyke swarm intruded the Caraíba Complex at about 0, 65- 0, 70 G.a. ago, as supported by the Rb-Sr isochron ages. These dykes appear to be derived from an enriched mantle source according to the Sr and Nd isotopic evidences. Tectonicaly, this dyke swarm is interpreted as a reflex intracratonic magmatism associated to the evolution of the Sergipano folded belt which took place marginally to the SFC, during the Brasiliano cycle.
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Andrade, João Batista Matos de. "Fatores influentes no potencial e processos de salinização dos aquíferos fraturados cristalinos do alto da Bacia do Rio Vaza-Barris, região de Uauá, Bahia, Brasil." Instituto de Geociências, 2010. http://repositorio.ufba.br/ri/handle/ri/21478.
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A área do alto da bacia do rio Vaza-Barris está situada no nordeste do estado da Bahia, na região de Uauá, sob clima semi-árido, onde as águas subterrâneas são oriundas de aquíferos fraturados cristalinos, situados em rochas predominantemente do embasamento, com presença de enxame de diques máficos na sua parte central. De um total de 115 poços tubulares pesquisados, apenas 7% apresentam valores de sólidos totais dissolvidos (STD) menores que 1000 mg/L e 20% produzem vazões abaixo de 0,30 m³/h. Apesar das limitações quantitativas e qualitativas, os aquíferos são de fundamental importância para região, em específico para o meio rural, onde nos períodos das secas constituem a principal fonte de abastecimento de água. Dentre os fatores influentes no potencial dos aquíferos fraturados cristalinos da área é observada a importância fundamental dos aspectos tectônicos e estruturais, seguida da litologia, incluindo a presença de corpos intrusivos tabulares, no caso, diques máficos e veios de quartzo. Na parte central estão os melhores aquíferos, com poços tubulares com vazões acima de 20 m³/h e água de baixa salinidade, concentrando a maioria dos poços com STD menor que 1000 mg/L, relacionados à presença de diques máficos e anfibolitos altamente metamorfizados, com fraturamentos densos e abertos, na direção preferencial NE-SW. As menores vazões estão relacionadas à metassedimentos ocorrentes na parte nordeste da área, dominada por feitos e xistos, com STD acima de 1000 mg/L em sua totalidade. Os dados hidroquímicos e de isótopos estáveis (δ2H e δ18O) revelam que fatores climáticos têm importante papel no processo de salinização das águas subterrâneas da região. As águas são cloretadas mistas, com baixa correlação entre o STD e o íon bicarbonato e, ao contrário, alta correlação entre o STD e o íon cloreto, indicando fraca associação entre a salinidade das águas subterrâneas e a interação água/rocha, considerando que o bicarbonato é presença constante nessa interação. Já os resultados de δ18O e δ2H indicam que as amostras com maiores valores de salinidade (STD>3000mg/L) sofreram processos de evaporação, promotores de concentrações cíclicas de sais nas águas subterrâneas. Por outro lado, as águas com menor salinidade (STD<3000 mg/L) apresentam padrão isotópico similar àquele obtido para a linha meteórica global (LMG), refletindo possivelmente a composição das precipitações da região. Por fim, partindo da visão das águas subterrâneas como um bem mineral estratégico, que carece de prospecção com critérios técnicos compatíveis com esse conceito, foi efetuada uma análise das atuais técnicas de prospecção empregadas na área e propostos procedimentos de melhorias, entre os quais a observância dos fatores influentes e a aplicação rotineira de métodos geofísicos.
The upper area of the river Vaza-Barril basin is located in the northeast of the state of Bahia, in Uauá region, under semi-arid climate, where groundwater coming from fractured crystalline aquifers, predominantly located in the basement, with the presence of mafic dike swarm in its central part. Of a total of 115 wells surveyed, only 7% had values of total dissolved solids (TDS) lower than 1000 mg/L and 20% produce flow rates below 0.30m³/h. Although they present qualitative and quantitative limitations, the aquifer have a fundamental importance for the region, particularly in rural areas, where in periods of drought those aquifers constitute the main source of water supply. Among the factors influencing the potential of the fractured crystalline aquifers of the area is noted the fundamental importance of tectonic and structural aspects, followed by lithology, including the presence of tabular intrusive bodies, as mafic dykes and quartz veins. In the middle of the area, there are the best aquifers, with tube wells with flow rates up to 20 m³/h and water of low salinity, where are most of the wells with TDS lower than 1000 mg/L, related to the presence of mafic dykes and highly metamorphosed amphibolites, with dens and open fractures, in preferential direction NW-SE. The lowest flows are related to metasediments which occurring in the northeast part of the area, dominated by phyllite and schist, with TDS above 1000mg/L in its entirety. Groundwater hydrochemical and stable isotopes (δ2H and δ18O) data show that climatic factor is an important that cause the process of salinization of groundwater in the region. The samples are mixed-Cl with low correlation between TDS and bicarbonate ion and, on the contrary, higt correlation of TDS and the chloride ion, indicating weak association of salinity of groundwater with the interaction water/rock, considering that the bicarbonate is constantly present in this interaction. The results of δ2H and δ18O analyses indicated that the samples with highest values of salinity (TDS>3000mg/L) were undergone processes of evaporation, promoters cyclical concentrations of salts in the groundwater. In the other hand, water with lower salinity (TDS<3000mg/L) have similar isotopic pattern that the global meteoric line (GML) possibly reflecting the composition of precipitation in the region. Finally, starting from the vision of groundwater as a strategic mineral, which needs technical criteria for it prospecting compatible with this concept, it was made an analysis of current techniques used in the area and proposed procedures for its improvements, this include observance of influential factors and the routine application of geophysical methods.
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Meyer, Jean-Pierre. "Identification des électrons d'impulsion transverse supérieure à 10 GEV/C dans l'expérience UA2' installée auprès du collisionneur proton-antiproton du CERN." Paris 11, 1989. http://www.theses.fr/1989PA112040.
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La décision du CERN d'augmenter d'environ un ordre de grandeur la luminosité du collisionneur proton-antiproton (ACOL) à 630 Gev a entrainé la modification du détecteur UA2 en vue de la recherche du quark top. Les améliorations apportées ont porté essentiellement sur l'identification des électrons et sur l'augmentation de la couverture du calorimètre hadronique. Le nouveau détecteur central met en oeuvre des techniques nouvelles d'identification des électrons, en particulier un détecteur à fibres optiques scintillantes (SFD). Ce détecteur élaboré au DPhPE du CEN de Saclay comporte ≈ 60000 fibres réparties sur 24 couches disposées sur un cylindre. Il assure à la fois la détection des traces (6 points dans l'espace) et la mesure de la position des pieds de gerbes électromagnétiques. La détermination précise de la distance trace-pied de gerbe permet au SFD de contribuer à la réjection des faux électrons induits par la superposition spatiale d'un hadron chargé et d'un pi-zéro. Les données de faible luminosité (46 nbˉ¹ ) accumulées par UA2 au cours de l'année 1987 nous ont permis de mettre en évidence une amélioration de l'identification des électrons dans le nouveau détecteur. La comparaison des spectres en impulsion transverse des électrons obtenus avec l'ancien et le nouveau détecteur indique une amélioration d'un ordre de grandeur de la réjection des faux électrons. Les perspectives en luminosité intégrée et la connaissance de l'appareillage UA2 devraient permettre à ce détecteur de réaliser des tests très contraignants du modèle standard et en particulier une avance sensible dans la recherche du quark topThe decision CERN to increase the luminosity of the proton-antiproton collider (ACOL) at 630 Gev in the center of mass by about one order of magnitude,has motivated the upgrade of the UA2 detector in order to search for the top quark. The main improvement of the detector consists in a better electron identification and an increase of the hadronic calorimeter coverage. The upgraded central detector uses new techniques to identify electrons, in particular a scintillating fiber detector (SFD). This detector of cylindrical geometry have been built at the CEN Saclay (DPhPE) using ≈ 60,000 fibers arranged in 24 layers,. It measures tracks (6 points in space) as well as the position of electromagnetic preshowers. It rejects fake electrons, simulated by the spatial overlap of a pi-zero and a hadron, with the help of a precise measurement of the distance between track ant preshower. Using data from a small integrated luminosity 46 nbˉ¹ achieved on 1987, we have studied the UA2 electron identification improvement. Comparing the electron transverse momentum spectra observed both in the old and the new detector we have found that the electron identification of the new UA2 apparatus has improved by an order of magnitude. The expected increase of the luminosity for the coming runs and the good knowledge of the UA2 apparatus will make it possible to improve tests of the standard model and in particular to achieve a better sensitivity for the top quark search
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Moning, Renate. "Analysis of test beam data of ECPT and two end cap calorimeter modules of UA2' and its comparison with GEANT and GHEISHA simulations /." [S.l.] : [s.n.], 1988. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
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Lançon, Eric. "Etude de la production de photons directs dans les interactions proton-antiproton à 630 GeV dans le centre de masse avec le détecteur UA2." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376070331.
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Ruhlmann, Vanina. "Mesure de la constante de couplage effective de l'interaction forte déduite de l'étude des processus de production des bosons W et Z (expérience UA2)." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37618350w.
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Loucatos, Sotiris. "Mise en évidence des bosons intermédiaires W± et Z° dans les collisions proton-antiproton à 546 GeV dans le centre de masse : expérience UA2." Paris 11, 1985. http://www.theses.fr/1985PA112340.
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Le Modèle Standard des interactions électromagnétiques et faibles prévoit l’existence des bosons intermédiaires W+̲ et Z° et prédit leurs masses. L’accumulation d’antiprotons par refroidissement stochastique et la transformation de l’accélérateur SPS du CERN en collisionneur a permis de réaliser des collisions p-p̄ à 546 GeV d’énergie dans le centre de masse. Cette thèse expose la mise en évidence des bosons intermédiaires à travers leurs désintégrations Z° → e⁺ e⁻ et W → ev. Pendant les périodes de prise de données de 1982 et 1983, 8 désintégrations Z° → e⁺ e⁻ et 32 désintégrations W → ev avec un électron de pT > 25 GeV/c ont été observées dans l’expérience UA2. Les sections efficaces de production du W+̲ et du Z° ainsi que les paramètres des interactions faibles : MW, MZ, sin²θW et p sont déterminés. Les valeurs obtenues sont en accord avec les prédictions du Modèle Standard, qui se trouve ainsi brillamment confirmé. Une limite supérieure à la largeur totale de désintégration du Z° est donnée. On en déduit une limite supérieure sur le nombre de neutrinos supplémentaires. Les désintégrations radiatives des bosons intermédiaires sont discutéesThe Standard Model of electromagnetic and weak interactions predicts the existence of the intermediate vector bosons W+̲ and Z° and gives precise predictions for their masses. Antiproton accumulation by stochastic cooling and the operation of the CERN SPS accelerator in collider mode made accessible pp̄ collisions at 546 GeV center of mass energy. This thesis presents the observation of the intermediate vector bosons through their decays Z° → e⁺ e⁻, W → ev. During running periods 1982 and 1983, 8 decays Z° → e⁺ e⁻ and 32 decays W → ev with an electron of pT > 25 GeV/c were observed in UA2 experiment. Cross sections of W+̲ and Z° production and the weak interaction parameters: MW, MZ, sin²θW and p are determined. These results are in agreement with Standard Model predictions, thus confirming theory in a spectacular way. An upper limit to the total width of the Z° is given. An upper limit to the number of additional neutrinos is inferred. Radiative decays of the intermediate vector bosons are discussed
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Ruhlmann, Vanina. "Mesure de la constante de couplage effective de l'interaction forte deduite de l'etude du processus de production des bosons w et z (experience ua2)." Paris 6, 1988. http://www.theses.fr/1988PA06A002.
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Lançon, Eric. "Etude de la production de photons directs dans les interactions proton-antiproton a 630 gev dans le centre de masse avec le detecteur ua2." Paris 7, 1987. http://www.theses.fr/1987PA077256.
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OLIVEIRA, Lucia Marisy Souza Ribeiro de. "Educação rural e desenvolvimento local sustentável: a lógica subjacente das relações inter-setoriais." Universidade Federal do Pará, 2005. http://www.repositorio.ufpa.br:8080/jspui/handle/2011/1737.
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This study aims to evaluate educational models generated inthe process of land occupation in the cities of Juazeiro, Uauá and Valente of the state of Bahia, not only in the irrigated areas but in dry land as well, having as guiding hypothesis the rural education as disseminating mechanism of information to the population and great mobilize of social, economic, politic, and cultural transformations of the communities, in the promotion of its sustainable development. The methodology of this research has taken as support the analysis of the social relation nets entwined in the process, choosing as categories preferences for the understanding of the phenomenon studied the social capital, local development, alternative pedagogy, school resume, and intersectorial partnership, through the splintering with the antagonism of the concepts of individual and society. It refers to a quanti-qualitative research founded in an approach of interactive character, where the speech emerges as space of negotiation of sense, and building of apprenticeship subject, whose subsidies added to the quantitative evidences allow the deepening of the complexity of the phenomena, its contradictions and relationship with the context. The analysis of data has conducted to understand that Rural Education in the areas researched live two situations: one, propagated for the public educational system which with the exception of some punctual experience do not care the interest of the people living and working in the field. The other, exercised by Non-Governmental Organizations which valuing the rural as space of life, form individuals with a repertoire of knowledge, abilities and values capable of mobilizing them in a transforming action.
Este estudo tem por objetivo avaliar os modelos de educação gerados nos processos de ocupação da terra nos municípios Juazeiro, Uauá e Valente no Estado da Bahia, tanto nas áreas irrigadas quanto nas de sequeiro, tendo como hipótese norteadora a educação rural como mecanismo disseminador de informações à população e grande mobilizadora das transformações social, econômica, política e cultural das comunidades, na promoção do seu desenvolvimento sustentável. A metodologia da pesquisa tomou por base a análise das redes de relações sociais engendradas no processo, elegendo-se como categorias preferências para a compreensão do fenômeno estudado o capital social, o desenvolvimento local, pedagogias alternativas, currículo escolar e as parcerias intersetoriais, através da ruptura com o antagonismo dos conceitos de indivíduo e de sociedade. Trata-se de pesquisa quanti-qualitativa fundamentada numa abordagem de caráter interativo, onde o discurso emerge como espaço de negociação do sentido e da construção dos sujeitos aprendizes, cujos subsídios somados às evidências quantitativas permitiram o aprofundamento da complexidade dos fenômenos, suas contradições e seu relacionamento com o contexto. A análise dos dados permitiu compreender que a Educação Rural nas áreas pesquisadas vive duas situações: uma, veiculada pelo sistema público de ensino que, salvo algumas experiências pontuais, não atende aos interesses dos povos que habitam e trabalham no campo. Outra, exercitada por Organizações Não Governamentais que valorizando o rural como espaço de vida, forma indivíduos com um repertório de saberes, habilidades e valores capaz de mobilizá-los para uma ação transformadora.
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Wang, Hsin-Yu, and 王心俞. "On SIS-UAU Epidemic Models." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/87838431789156415779.
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碩士國立交通大學
應用數學系所
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In this thesis, an epidemic model in multiplex networks in which the dynamics of susceptible-infected-susceptible (SIS) process in the physical world coexists with that of a cyclic process of unaware-aware-unaware (UAU) in the virtual world is considered. The adjacency matrices that support the SIS and UAU processes are denoted by B and A, respectively. Such model may contain three possible equilibria: the disease and information free equilibrium (0; 0), the disease free and information saturated equilib- rium (0; q), and the endemic and information saturated equilibrium (p; q). Our main results contain the following. First, for any irreducible matrices A and B, if the basic reproduction number RP 0 in the physical world is less than or equal to 1, then (0; 0) (resp., (0; q)) is globally stable (resp., globally stable except at (0; 0)) provided that the basic reproduction number RV 0 in the virtual world is less than or equal to (resp., greater than) 1. Second, we investigate the local dynamics of the model and develop some strategies to study the case when the connecting networks are homoge- neous such as all-to-all. In particular, for A and B being all to all, we conclude that (0; q) is locally stable provided that 1 < RP 0 RV 0 . That is to say, the outbreak of the disease can always be prevented as long as the awareness level in the virtual world is better than the infectious level in the physical world. It is also showed that if RP 0 > 1 and RV 0 < RP 0 , then (p; q) exists. Our results also yield threshold curve of epidemic outbreak in the parameter space, which determines the existence of the endemic equi- librium or the onset of the loss of the stability of the disease free equilibria ((0; 0) and (0; q)).
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"O emprego de sistema de informação geo-referencia da (SIG) na identificação dos corpos maficos-ultramaficos da região de Uaua-Bahia." Tese, Biblioteca Digital da Unicamp, 1995. http://libdigi.unicamp.br/document/?code=vtls000094089.
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Santos, Bruna Alexandra Barreiros. "O Papel da Assessoria de Comunicação na Reputação da Marca." Master's thesis, 2019. http://hdl.handle.net/10400.6/10186.
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A assessoria de comunicação tem várias vertentes, desde o trabalho de assessoria de imprensa
ao planeamento e gestão de redes socias. É o bom funcionamento de assessoria de uma marca
que determina o seu posicionamento no mercado e o seu nível de reputação.
A comunicação das marcas, dentro do campo das relações públicas e da área da assessoria de
comunicação, é central no relatório que apresentamos. No caso, analisaremos o papel da
assessoria de comunicação na apresentação da marca Be Uau, a partir de observação
participante e de análise de conteúdo, e o impacto desta na reputação da mesma.
O presente relatório resulta de um estágio de três meses na agência de comunicação Creative
Minds e da observação direta da aplicação do plano estratégico de comunicação do lançamento
da marca Be Uau no mercado. O estudo integrado neste relatório resulta da análise do trabalho
de assessoria de imprensa e da comunicação online nas redes sociais Facebook e Instagram.
Nele se conclui que, apesar da proeminência da comunicação nas redes digitais, a ligação das
marcas aos órgãos de comunicação formais continua a ser fundamental para efeitos de
credibilização e de reputação.The communication advisory has several aspects, from the work of press advisory to the planning and management of social networks. It is the proper functioning of a brand's advice that determines its position in the market and its reputation level. Brand communication, within the field of public relations and the area of communication advisory, is central to the report we present. In this case, we will analyze the role of the communication consultancy in the presentation of the Be Uau brand, based on participant observation and content analysis, and its impact on reputation of the brand we present. This report is the result of a three-month internship with the Creative Minds communication agency and the direct observation of the implementation of the strategic communication plan for the launch of the Be Uau brand on the market. The study integrated in this report results from the analysis of press work and online communication on social networks Facebook and Instagram. It concludes that, despite the prominence of communication in digital networks, the linking of brands to the formal media remains fundamental for credibility and reputation purposes.