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Valette, Sébastien Magnin Isabelle Prost Rémy. "Modèles de maillages déformables 2D et multirésolution surfaciques 3D sur une base d'ondelettes." [S.l.] : [s.n.], 2002. http://csidoc.insa-lyon.fr/these/2002/valette/index.html.
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Vergnioux, Roland. "KK-théorie équivariante et opérateur de Julg-Valette pour les groupes quantiques." Phd thesis, Université Paris-Diderot - Paris VII, 2002. http://tel.archives-ouvertes.fr/tel-00001809.
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Cette thèse s'inscrit dans l'étude de la KK-théorie équivariante par rapport à un groupe quantique localement compact. On généralise notamment certaines notions et certains résultats connus dans le cas des groupes : théorème de stabilisation, morphisme de descente, théorème de Green-Julg, K-moyennabilité. On cherche ensuite à introduire des outils géométriques utiles dans ce contexte, et on associe notamment à un groupe quantique discret et à un produit libre amalgamé de groupes quantiques discrets des objets qui peuvent s'interpréter comme des arbres quantiques. On étudie en particulier les opérateurs de Julg-Valette associés aux groupes quantiques libres de Wang-Banica : ce cas présente de nombreuses nouveautés par rapport au cadre classique, la principale étant la non-involutivité de l'opérateur de retournement des arêtes qui rend nécessaire la construction d'une représentation additionnelle du groupe quantique discret pour obtenir un élément de KK-théorie.
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De, Chiffre Marcus [Verfasser], Andreas [Akademischer Betreuer] Thom, and Alain [Gutachter] Valette. "Approximate representations of groups / Marcus De Chiffre ; Gutachter: Alain Valette ; Betreuer: Andreas Thom." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1227196415/34.
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Larcade, Véronique. "Jean-Louis Nogaret de la Valette, duc d'Epernon (1554-1642) : une vie politique." Paris 4, 1995. http://www.theses.fr/1994PA040232.
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Le premier duc d'epernon n'est associe a aucune grande victoire, projet ou oeuvre durable. Neanmoins il est aux yeux de ses contemporains, un personnage considerable. Paradoxalement, dans cette vie ou rien n'est politique, tout est politique. Homme de pouvoir, disposant d'une impressionnante clientele liee a la charge de colonel general de l'infanterie; il ne sait que faire du pouvoir, faute d'une culture capable de lui permettre de resoudre des aspirations contradictoires. Aussi brillante qu'ambigue sa reussite est representative d'un certain stade d'evolution du pouvoir royal en france entre la fin du xvies. Et le premier xviiesThe first duke of epernon is neither connected to ouny lasting achievement nor striking victory. He is but a very important person to his contemporaries. Strangely enough, this a political life is au politics. The duke is powerful mostly because of his positions as colonel genral of french infantry that provides him with a large and impressive clientele. But he doesn't know how to deal with power. He misses a culture to clear contradictory y earnings. His success is outstanding and mixedup as well. It exemplifies how royal power is evolving in late xvith and early xviith france
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Alekseev, Vadim [Verfasser], Andreas [Gutachter] Thom, Thomas [Gutachter] Schick, and Alain [Gutachter] Valette. "Groups, operator algebras and approximation / Vadim Alekseev ; Gutachter: Andreas Thom, Thomas Schick, Alain Valette." Dresden : Technische Universität Dresden, 2021. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa2-761277.
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Dowerk, Philip [Verfasser], Andreas [Akademischer Betreuer] Thom, Andreas [Gutachter] Thom, and Alain [Gutachter] Valette. "Algebraic and Topological Properties of Unitary Groups of II_1 Factors / Philip Dowerk ; Gutachter: Andreas Thom, Alain Valette ; Betreuer: Andreas Thom." Leipzig : Universitätsbibliothek Leipzig, 2015. http://d-nb.info/1239565216/34.
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D'accriscio, Florian. "Complexes de nickel caméléons : exploration de tous ses degrès d'oxydation pour la formation de liaisons C-C et C-CF3." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30216.
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Ce projet de recherche porte sur l’étude de complexes de nickel à différents degrés d’oxydation (de 0 à +IV) dans le but de promouvoir la formation de liaisons C–C et C–CF3. Dans une première partie, l’étude porte sur l’utilisation de complexes de nickel à basse valence en tant que catalyseurs pour les réactions de couplage croisé de Negishi et de Suzuki-Miyaura. Si la formation de liaisons C–C est une réaction parfaitement maîtrisée au palladium, l’emploi de complexes de nickel comme catalyseurs est plus difficile à appréhender d’un point de vue mécanistique. Dans ce travail, l’utilisation d’un ligand bis-phosphine a permis de synthétiser et d’isoler des complexes de nickel(0). Une étude mécanistique complète alliant expériences et calculs DFT démontre que la réaction de Negishi fonctionne uniquement sur un régime Ni(0)/Ni(II). Des études préliminaires montrent en revanche que le mécanisme est tout autre lorsqu’on s’intéresse à la réaction de Suzuki-Miyaura. Dans une deuxième partie, l’objectif est la formation de liaisons C–CF3 en utilisant des complexes de nickel à haute valence. La formation de ces liaisons à partir de métaux de transition reste un défi puisque les méthodologies utilisées à ce jour au niveau industriel nécessitent l’utilisation de conditions drastiques et conduisent à la formation de composés nocifs pour l’environnement. Ce n’est que très récemment que des travaux de recherche ont porté sur l’utilisation du nickel comme support à la formation de liaisons C–CF3. Ce projet décrit la synthèse de complexe de nickel(III) portant deux groupements CF3 et l’utilisation d’un complexe dimérique de nickel(III) comme plateforme pour l’accès à d’autres complexes [NiIII(CF3)2]. Si ces complexes ne permettent pas de former de liaisons C–CF3, une espèce de nickel(IV) permet la formation de telles liaisons. Il s’agit de plus du premier complexe de nickel(IV) portant deux atomes de fluor et deux groupements CF3 capable de promouvoir l’activation de liaisons C–HThis research project aims at the study of nickel complexes in different oxidation states (from 0 to +IV) in order to promote C–C and C–CF3 bond formation. In a first part, low-valent nickel complexes are used as catalysts to perform Negishi and Suzuki-Miyaura cross-coupling reactions. If the C–C bond formation is a well-known reaction using palladium catalysts, the use of nickel complexes as catalysts is more complicated to understand in the mechanistic aspect. In this work, the key point is the use of a bis-phosphine ligand which allows the synthesis and isolation of nickel(0) complexes. A full mechanistic study via stoichiometric reactions as well as DFT calculations confirms that the Negishi cross-coupling works only on a Ni(0)/Ni(II) catalytic cycle. Surprisingly, preliminary studies on the Suzuki-Miyaura cross-coupling reactions show that the mechanism pathway is completely different. In a second part, our interest is focused on the C–CF3 bond formation using high-valent nickel complexes. In chemical industries, the C–CF3 bond formation requires harsh conditions and also produces toxic waste for the environment. This mainly explains why the use of transition metals is still challenging in this topic. However in the last few years, the interest for the use of nickel complexes as coupling agent for C–CF3 bond formation has grown. This work deals with the synthesis of nickel(III) complexes bearing two CF3 substituents and the use of a dimeric nickel(III) complex as a building block for the formation [NiIII(CF3)2] type complexes. If these species do not promote the C–CF3 cross coupling, a nickel(IV) complex shows its ability to create this bond. Moreover, this is the first nickel(IV) species bearing both fluorine and CF3 substituents at the same metal center and promoting C–H bond activation
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Randow, Elise von. "Valente Substantive des Englischen /." Tübingen : G. Narr, 1986. http://catalogue.bnf.fr/ark:/12148/cb34980257n.
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Silva, Tamy Amorim da. "Memórias sobre uma dama valente." reponame:Repositório Institucional da UFSC, 2016. https://repositorio.ufsc.br/xmlui/handle/123456789/173267.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas, Programa de Pós-Graduação em História, Florianópolis, 2016.Made available in DSpace on 2017-02-14T03:06:39Z (GMT). No. of bitstreams: 1 344147.pdf: 3532528 bytes, checksum: ca1ac6a616d11d1f3632cf5d57b74a3a (MD5) Previous issue date: 2016
Esta dissertação tem como objetivo narrar à trajetória de Carmen de Lara Castro (1919-1993), mulher paraguaia que durante a ditadura foi deputada nacional (1968-1978) e criou, com ajuda de outras pessoas engajadas na oposição a Stroessner, a Comisión de Defensa de Los Derechos Humanos del Paraguay (CODEHUP), fundada no ano de1967. Em função de sua luta, Carmen de Lara Castro faz parte da memória paraguaia, sendo recordada em livros, em entrevistas e periódicos. Diante disso, este trabalho pretende refletir e analisar como Carmen de Lara Castro é lembrada e narrada em entrevistas orais, problematizando sua trajetória como militante pelos Direitos Humanos - papel muito mais destacado pelas narrativas orais - e como política opositora do regime junto ao Partido Liberal. Para isso utilizo como fontes, principalmente, memórias orais e documentos do Centro de Documentación y Archivo para la Defensa de los Derechos Humanos (CDyA) - alcunhado de Archivo del Terror. Metodologicamente esta dissertação baseou-se nos estudos de gênero, nos estudos sobre memórias e nas ferramentas da história oral. Já o recorte temporal abarca os anos de 1967 a 1989, respectivamente o início da CODEHUP e da carreira parlamentar de Carmen de Lara Castro e o final da ditadura stronista.
Abstract : This thesis aims to narrate the trajectory of Carmen de Lara Castro (1919-1993), a Paraguayan woman who, during the dictatorship, was a National Representative (1968-1978) and created, with the help of other people engaged to oppose Stroessner, the Comisión de Defensa de Los Derechos Humanos del Paraguay (CODEHUP), founded in the year of 1967. The organization was headed by her for 26 years and proposed during its existance: to denounce the regime?s violence, to struggle for freedom, to assist prisoners and also to raise the Paraguayan population awareness about the importance of human rights. Because of her fight, Carmen de Lara Castro is part of the Paraguayan memory, being remembered in books, interviews and periodicals. To this, we intend to reflect and analyze how Carmen de Lara Castro is remembered and narrated in oral interviews, aiming to discuss her career as a militant for Human Rights - role much more prominent in the oral narratives - and also as a political opposition of the regime with the Liberal Party. For this we use as sources mainly oral memories and documents of the Documentación y Archivo para la Defensa Centre de los Derechos Humanos (CDyA) - nicknamed Archivo del Terror. Methodologically this dissertation was based on gender studies, studies on memories and oral history tools. The time frame covers the years of 1967 to 1989, respectively the beginning of the CODEHUP and the parliamentary career of Carmen de Lara Castro and the end of the stronist dictatorship.
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Valente, Marica [Verfasser]. "Essays on Applied Microeconomics / Marica Valente." Berlin : Humboldt-Universität zu Berlin, 2021. http://d-nb.info/1226153429/34.
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Marques, Helder Miguel Rosas da Costa. "Sérgio Valente: um fotógrafo da oposição." Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/4538.
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Mestrado em Estudos EditoriaisNo presente projecto de mestrado, o autor propõe um plano de edição de um livro impresso para a publicação comercial de um espólio fotográfico inédito, pertença de Sérgio dos Santos Valente (n. 1943), fotógrafo portuense, ao qual se reconhece um importante valor histórico e patrimonial. Para a sua concretização foi desenvolvida investigação para a produção dos conteúdos escritos que constituem o original do projecto (de cujo processo este relatório dá conta), ao mesmo tempo que se desenvolveu uma proposta fundamentada de concepção gráfica em que aquela publicação se poderá materializar.
In this Project, the author proposes a plan to issue a printed book for commercial publication of an unpublished photographic collection, property of Sérgio dos Santos Valente (b.1943), a photographer from Oporto, to which is recognized a significant historical and patrimonial value. For its implementation it was developed research for the production of written the contents that compose the original project (which processes are described in this report), while it was developed a proposal for the graphic design in which that publication could be materialized.
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Abrão, Wanderci Marys Oliveira. "Avaliação do impacto da vacina antipneumocócica conjugada na ocorrência de doenças respiratórias em lactentes." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/17/17139/tde-25052015-105804/.
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Estudos realizados e recomendados pela OMS e UNICEF, indicam alta prevalência de infecções pneumocócicas e meningocócicas, sobretudo em crianças abaixo dos dois anos de idade. O Streptococcus pneumoniae é um dos agentes mais frequentes de pneumonia, otite média aguda (OMA), meningite e sinusite em crianças. O número global de mortes em crianças menores de cinco anos de idade causadas por pneumonia foi de 8,8 milhões, em 2008. O Ministério da Saúde, devido ao alcance de bons resultados com soroconversão por imunização, indicou a implantação das vacinas antipneumocócica 10-valente e meningocócica C conjugadas no calendário vacinal das crianças menores de dois anos de idade. Na presente pesquisa, conduziu-se um estudo transversal com componente retrospectivo desenvolvido nas redes de Atenção Básica e Hospitalar de Guaranésia, cidade de pequeno porte do interior do estado de Minas Gerais. Objetivou-se avaliar o impacto da vacinação na ocorrência de doenças respiratórias em lactentes, considerando o período anterior e posterior à introdução da vacina antipneumocócica 10-valente, no Programa Nacional de Imunização. Na análise estatística definiu-se o período entre 2009 e 2012. O método de estudo adotado foi o um estudo transversal aninhado em uma série temporal, sendo observado que no período pós introdução da vacina antipneumocócica 10 valente conjugada houve uma redução de 40% na prevalência de pneumonia adquirida na comunidade, com diferença estatística entre os dois períodos . Confirmou-se que a oscilação sazonal tem interferência nas doenças estudadas. Em relação ao sexo, constatou-se que o masculino tem predomínio sobre o feminino quanto ao acometimento por pneumonia. Foi observado que o sexo masculino apresentou 28% mais chance de PNM. Em relação à otite média aguda e à rinossinusite, a variável sexo não apresentou predomínio entre elas. Os dados estatísticos, considerando a razão de prevalência (RP = 1,96 (IC95%: 1,52 2,53); p <0,05), sugeriram que não vacinar está associado com a ocorrência de PNM. Constatou-se que a prevalência de PNM foi 70% menor (RP 0,30 (IC95%: 0,24 0,37); p<0,05) nas crianças com vacina em dia comparando-se àquelas com a vacina em atraso, ou seja, manter vacina em dia sugere proteção contra PNM. No entanto, houve 53% menos OMA entre não vacinados do que entre vacinados (RP = 0,47 (IC95%: 0,35 0,64); p<0,05). Diante dos resultados encontrados, pode-se concluir que a vacinação antipneumocócica 10-valente está associada com redução dos casos de pneumonia adquirida na comunidade em lactentes.Studies and recommended by WHO and UNICEF, indicate a high prevalence of pneumococcal and meningococcal infections, especially in children under two years of age. Streptococcus pneumoniae is one of the most frequent agents of pneumonia, acute otitis media (AOM), meningitis and sinusitis in children. The overall number of deaths in children under five years of age caused by pneumonia was 8.8 million in 2008. The Ministry of Health due to reach good results with seroconversion by immunization, indicated the implementation of pneumococcal vaccines 10- meningococcal C conjugate and brave in the immunization schedule of children under two years of age. In this research, conducted a cross-sectional study with retrospective component developed in primary care networks and Hospital Guaranésia, small town in the state of Minas Gerais. This study aimed to assess the impact of vaccination on the incidence of respiratory diseases in infants, considering the time before and after the introduction of the vaccine pneumococcal 10-valent, the National Immunization Program. Statistical analysis defined the period between 2009 and 2012. The adopted method of study was a cross-sectional study nested in a time series, it was observed that in the post introduction period of pneumococcal vaccine conjugate 10 brave there was a 40% reduction in the prevalence of community-acquired pneumonia, with statistical difference between the two periods. It was confirmed that the seasonal oscillation has interference in the diseases. With regard to gender, it was found that the male is predominant over females in relation to involvement by pneumonia. It was observed that men had 28% more chance of pneumonia. In relation to acute otitis media and sinusitis, sex does not showed a predominance among them. Statistical data, considering the prevalence ratio (PR = 1.96 (95% CI: 1.52 to 2.53), p <0.05), suggested that not vaccinating is associated with the occurrence of pneumonia. It was found that the prevalence of pneumonia was 70% lower (PR 0.30 (95% CI: 0.24 to 0.37), p <0.05) in children with day vaccine is compared to those of the vaccine in delay, ie to keep day suggests vaccine protection against pneumonia. However, there were 53% fewer of AOM than for unvaccinated vaccinated (OR = 0.47 (95% CI: 0.35 to 0.64); p <0.05). Considering the results, it can be concluded that vaccination pneumococcal 10-valent is associated with reduction of cases of community-acquired pneumonia in infants.
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Valvassori, Igor Santos. "Som de Valente: bailes negros em São Paulo." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/8/8136/tde-22032019-103557/.
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A pesquisa tem como questão principal qual o significado dos bailes negros para São Paulo e para a problemática urbana. O baile, enquanto significante inscrito no espaço-tempo da metrópole, carrega quais significados para os seus frequentadores, para quem não frequenta, para quem pensa em saídas para esse (re)produzir desumano da cidade? Diante desta pergunta, a partir do método de análise progressivo-regressivo proposto por Henri Lefebvre, utilizando-se de pesquisa bibliográfica, entrevistas, observações de campo e coleta de materiais a discussão inicia-se a partir do baile nostalgia, manifestação cultural contemporânea dos bailes negros. Partindo do baile nostalgia, a pesquisa foi conduzida por toda a trajetória da relação da população negra com os bailes desde o pós-abolição, em que três períodos com características específicas foram categorizados: os bailes negros, do pós-abolição ao ano de 1958; os bailes black, de 1958 até 1994; e os atuais bailes nostalgia, de 1995 até 2016, ano privilegiado nas observações de campo e entrevista. Os bailes foram compreendidos como uma forma de encontro com conteúdos ligados às lutas, às resistências e ao vivido da população negra em São Paulo em articulação com o processo de produção deste espaço urbano, que se faz de forma desigual socialmente e racializada. Entre estes conteúdos estão a produção de uma vida pública na cidade, a relação centro-periferia que se configura no meio do século XX e a memória corporal, coletiva e política dos negros em um contexto em que a reprodução do espaço se faz produzindo espaços amnésicos e uma sociabilidade de tempo efêmero, que atinge diretamente os referenciais de identidade e vida da população paulistana. Os significados dos bailes negros para São Paulo, então, são diversos, tecidos em uma trama na qual a rede negra se faz e refaz tendo o baile como um de seus nós. Os bailes significam, para negros, brancos e pobres também um viver a cidade na contra-lógica da reprodução do espaço sob a lógica capitalista que nega a vida constantemente em favor da superação crítica de suas inerentes crises de reprodução.The research has, as its main question, what is the meaning of \"bailes negros\" for São Paulo and urban problematic. The baile (ball) while a signifier enrolled in the space-time of the metropolis carries what meanings to its attendants, to those who do not attend, to those who think of exits for this inhuman (re) production of the city? Based on the method of progressive-regressive analysis proposed by Henri Lefebvre, using bibliographical research, interviews, field observations and material collection, the discussion begins with the baile nostalgia, a contemporary cultural manifestation of the bailes negros. Starting from the baile nostalgia, the research was conducted through the whole trajectory of the relation of the black population to the dances since post-abolition, in which three periods with specific characteristics were categorized: the bailes negros, since abolition of slavery till 1958; the bailes black, from 1958 to 1994; and the current bailes nostalgia, from 1995 to 2016, principal year in the field observations and interviews. The dances were understood as a form of encounter with contents related to the struggles, resistances and experienced of the black population in São Paulo in articulation with the process of production of this urban space, which is done in a socially and racialized unequal way. Among these contents are the production of a public life in the city, the center-periphery relationship that is set in the middle of the twentieth century and the corporal, collective and political memory of blacks in a context in which the reproduction of space is done producing amnesic spaces and an ephemeral sociability of time, which directly affects the identity and life referents of the population of São Paulo. The meanings of the bailes negros for São Paulo, then, are diverse, woven into a plot in which the black net is made and remakes having the ball as one of its nodes. The dances mean, for blacks, whites and poor people, to live the city in the counter-logic of the reproduction of space under the capitalist logic that denies life constantly in favor of the critical overcoming of its inherent crises of reproduction.
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Balsan, Alain. "Valence au grand siècle /." Valence : E & R, 2000. http://catalogue.bnf.fr/ark:/12148/cb38805647c.
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Derr, Julien. "Valence, magnétisme et conduction dans les composés à valence intermédiaire : Le cas SmB6." Phd thesis, Université Joseph Fourier (Grenoble), 2006. http://tel.archives-ouvertes.fr/tel-00133598.
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Le composé SmB6 est un exemple typique de la physique étrange qui peut résulter d'un équilibre de valence. La première configuration du Samarium (Sm2+) correspond à un état isolant non magnétique alors que la seconde (Sm3+) donnerait théoriquement un état magnétique et conducteur. Des mesures de microcalorimétrie sous pression ont permis d'établir le diagramme de phase magnétique de SmB6 : une nouvelle phase magnétique ordonnée à longue distance a été mise en évidence pour des pressions supérieures à 10GPa. D'un autre coté, des mesures de transport réalisées sous pression hydrostatique permettent de situer la transition isolant-métal pour la même pression. Le diagramme de phase sous pression est désormais bien établi et l'observation pour la première fois d'une anomalie magnétique dans les courbes de résistivité au delà de 10GPa permet d'affirmer que la coïncidence des deux phénomènes a bien lieu. Ce changement de comportement du système est discuté dans un nouveau cadre théorique prenant en compte la température Kondo du réseau comme paramètre clef pour la renormalisation de la fonction d'onde vers l'une ou l'autre configuration de valence entière alors que la valence mesurée est toujours nettement intermédiaire. Cette idée générale semble par ailleurs s'appliquer à d'autres composés à valence intermédiaire étudiés (SmS, TmSe). En parallèle, des mesures de résistivité sous contraintes uniaxiales ont été réalisées. Elles mettent en évidence un fort effet d'anisotropie dans le composé SmB6. La comparaison de ces expériences avec les résultats obtenus dans des conditions de pression très hydrostatiques permettent de revisiter le problème de la nature du gap de SmB6.
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Oliveira, Fernanda Gandra de. "S?ntese e caracteriza??o do comp?sito ferro zero-valente nanoparticulado/carv?o ativado granulado (nFZV-CAG) e sua aplica??o para remo??o do f?rmaco nimesulida pelos processos adsor??o/redu??o e ozoniza??o catal?tica heterog?nea." UFVJM, 2016. http://acervo.ufvjm.edu.br/jspui/handle/1/1313.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)
O comp?sito nFZV-CAG foi empregado para a ozoniza??o catal?tica heterog?nea da NMS em meio aquoso. O oz?nio foi gerado por uma central geradora de oz?nio IPABRAS, alimentada com ar. Foram avaliados diferentes processos catal?ticos como O3, CAG, O3-CAG, O3-nFZV- CAG, e a varia??o da concentra??o das nFZV para remo??o da NMS. Os resultados mostraram que a combina??o do O3-nFZV-CAG foi muito eficiente levando ? mineraliza??o de aproximadamente 70% da NMS em 120 min de rea??o. Tal efici?ncia pode estar atribu?da ao processo de eletr?lise, em que o Fe0 origina Fe2+ levando ? produ??o do radical hidroxila que ? altamente oxidante, levando a destrui??o do contaminante. As rea??es seguiram a cin?tica pseudo-primeira ordem para remo??o do f?rmaco. Ap?s realizada a coleta as amostras foram submetidas a an?lise qu?mica, empregando-se as t?cnicas de espectrofotometria de UV-Vis, cromatografia l?quida de alta efici?ncia (CLAE) e a determina??o da demanda qu?mica de oxig?nio (DQO) tamb?m foi realizada.
As nanopart?culas de FZV imobilizadas sobre a superf?cie do carv?o ativado (nFZV-CAG) foram sintetizadas e caracterizadas para remo??o do f?rmaco Nimesulida (NMS) em sistemas aquosos. Os estudos foram realizados em bateladas com agita??o de 250 rpm durante 120 minutos, onde foram avaliadas a efici?ncia, concentra??o (20, 25 e 30% do comp?sito) e diferentes dosagens (0,1 a 10g) de nFZV-CAG. Os resultados mostraram que a dosagem de 10 g de 20%nFZV-CAG removeu cerca de 80% da NMS 50 mg L-1 em apenas 30 minutos de rea??o, e atingindo 100% em 120 minutos. Foi observada ainda uma remo??o de 80% da DQO ao final da rea??o. As velocidades de rea??o aumentaram na medida em que foram aumentadas as dosagens do comp?sito, o que seria esperado. Por?m, com o aumento da concentra??o (%) de nFZV n?o houve aumento na velocidade das rea??es. As rea??es seguiram uma cin?tica de pseudo-primeira ordem em rela??o ? remo??o da NMS. Ap?s realizada a coleta, as amostras foram submetidas a an?lise qu?mica, empregando-se as t?cnicas de espectrofotometria de UV- VIS, cromatografia l?quida de alta efici?ncia (CLAE) e a determina??o da demanda qu?mica de oxig?nio (DQO) tamb?m foi realizada. Para caracteriza??o do comp?sito foram empregadas as t?cnicas Microscopia Eletr?nica de Varredura acoplada ? Espectrometria de Energia Dispersiva de Raios-X (MEV-EDS), que mostraram claramente a presen?a da nanopart?culas sobre a superf?cie do carv?o, e analise de superf?cie do nFZV-CAG e do CAG tamb?m foram realizadas.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2016.
The FZV nanoparticles immobilized onto the surface of the activated charcoal (nFZV-CAG) were synthesized and characterized for the removal of the pharmaceutical Nimesulide (NMS) in aqueous systems. The studies were performed in batch mode with stirring speeds of 250 rpm during 120 minutes, so that it was possible to evaluate efficiency, concentration (20, 25 and 30% of the composite) and different dosages (0,1 to 10g) of nFZV-CAG. The results showed that the dosage of 10g of 20%nFZV-CAG removed approximately 80% of NMS 50 mg L-1 in just 30 minutes of reaction, and reaching 100% in 120 minutes. It was still observed a removal of 80% of the COD (Chemical Oxygen Demand) at the end of the reaction. The reaction rates increased with the dosage of the composite, which was expected. Though, increasing the concentration (%) of nFZV did not result in higher reaction rates. The reactions followed a pseudo-first order kinetics for the removal of NMS. After the samples were collected, they were submitted to chemical analysis, employing the techniques of UV-VIS spectroscopy, high performance liquid chromatography (HPLC) and chemical oxygen demand (COD). In order to characterize the composite, the following techniques were used: Scanning Electron Microscopy (SEM) coupled with Energy Dispersive x-Ray spectroscopy (EDS), which showed clearly the presence of nanoparticles onto the charcoal surface. Analysis of the surface of nFZV-CAG were also performed.
The composite nFZV-CAG was used for the catalytic ozonation of NMS in aqueous media. The ozone was generated by an ozone generator IPABRAS, fuelled with air. Different catalytic processes were evaluated such as O3, CAG, O3-CAG, O3-nFZV-CAG, and the variation of the nFZV concentration for the removal of NMS. The results showed that the combination of O3- nFZV-CAG was very efficient, leading to the mineralization of approximately 70% of NMS in 120 minutes of reaction. Such efficiency can be attributed to the electrolysis process, in which the Fe0 generates Fe2+ which generates hydroxyl radicals that are highly oxidant, leading to the destruction of the contaminant. The reactions followed the pseudo-first order kinetics for the removal of the pharmaceutical. After the samples were collected, they were submitted to chemical analysis such as, UV-VIS spectroscopy, high performance liquid chromatography (HPLC) and chemical oxygen demand (COD).
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Davis, M. J. "Valence-Electron-Only Valence Bond calculations on the low lying states of Na-S." Thesis, University of Bristol, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384414.
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Mora, Figuera Anna Cris. "Helena Valentí, escriptora i traductora." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/369578.
Full textAbstract:
Helena Valentí, escriptora i traductora estudia l’obra narrativa i de traducció d’Helena Valentí. L’objectiu general de la tesi és recuperar la figura d’Helena Valentí. Per això, en la primera part se’n reconstrueix la biografia, la qual comprèn els orígens familiars, la infantesa, l’adolescència, la joventut a la universitat, els estius al Coll de Poses, a Sant Feliu de Guíxols i a Cadaqués, l’exili voluntari a Anglaterra, la tornada a Catalunya l’hivern de 1974 i la darrera etapa a Barcelona, fins a la mort el 1990. Els objectius específics han estat situar la seva obra en la genealogia de dones escriptores i traductores catalanes del segle XX, estudiar-ne l’obra narrativa i traductora, analitzar la influència de Katherine Mansfield en l’obra teatral inèdita K.M.: La felicitat i altres històries i, finalment, recopilar, ordenar i classificar el fons documental d’Helena Valentí, cedit per la família.
La segona part de la tesi se centra en l’anàlisi de l’obra narrativa, en la qual hem tractat les influències i els agermanament literaris, la temàtica, l’estil, la simbologia i el concepte d’escriptura de Valentí. La tercera part examina les nombroses traduccions al castellà i al català de l’escriptora, a fi de dilucidar les fronteres entre la traducció professional i la traducció vocacional. Un punt important d’aquesta part és l’influx de Katherine Mansfield en l’obra de Valentí i l’estudi de la peça teatral inèdita K.M.: La felicitat i altres històries.
A l’últim, en els annexos, hi hem inclòs un primer inventari dels fons documental d’Helena Valentí, una mostra fotogràfica del seu fons bibliogràfic, una gran part dels correus electrònics intercanviats per l’autora amb amistats i coneixences de Valentí i l’obra de teatre K.M.: La felicitat i altres històries.
Atesa la manca d’estudis acadèmics sobre Helena Valentí, aquesta tesi pretén omplir un buit bibliogràfic manifest.Helena Valentí, writer and translator studies Helena Valentí’s writing and translating work. The main aim of this thesis is to rekindle the memory of Helena Valentí. Therefore, the first part comprises her biography, which examines her family origins, her childhood, her adolescence, her youth at university, her summers in Coll de Poses, Sant Feliu de Guíxols and Cadaqués, her voluntary exile in England, her return to Catalonia in the winter of 1974 and the final stage of her life in Barcelona, until her death in 1990. More specifically, we have sought to place her work in the genealogy of the Catalan women writing and translating in the 20th century; we have studied and analysed her writing and translating work; we have also examined Katherine Mansfield’s influence on Valenti's unpublished play K.M.: La felicitat i altres històries; finally, we have compiled, ordered and classified her document archive, which was made available by her family. The second part of our thesis focuses on the analysis of her narrative work, which includes her fictional influences and bonds with other writers, her subjects, her symbols and her perspective on writing itself. The third part deals with her numerous translations into Spanish and Catalan in order to define the boundaries between professional and vocational translation. An important aspect of this last part is Katherine Mansfield’s influence on her work and the study of her unpublished play K.M.: La felicitat i altres històries. Finally we have attached an inventory of her document archive in the annexes, some sample photos of her bibliographic archive, most of the emails that we have sent to Valentí’s friends and acquaintances and the play mentioned above. Due to the lack of academic work about Helena Valentí, this thesis seeks to fill an evident bibliographic vacuum.
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Faraon, Montathar. "Valence asymmetry in impression formation." Thesis, Kristianstad University College, Department of Behavioural Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-4402.
Full textAbstract:
Are implicit attitudes as easily formed as explicit attitudes? Fifty-four participants carried out an experiment regarding the behaviors of a fictional protagonist. Attitudes were obtained by the Implicit Association Test (IAT) and by explicit evaluations. The results in the current study showed tendency towards a significant persistence effect for explicit attitudes and a positivity bias effect for implicit attitudes.
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Gonen, Ozgur. "Modeling planar 3-valence meshes." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85883.
Full textAbstract:
In architectural and sculptural practice, the eventual goal is constructing the
shapes that have been designed. Due to fabrication considerations, shapes with planar
faces are in demand for these practices.
In this thesis, a novel computational modeling approach to design constructible
shapes is introduced. This method guarantees that the resulting shapes are planar
meshes with 3-valence vertices, which can always be physically constructed using
planar or developable materials such as glass, sheet metal or plywood. The method
introduced is inspired by the traditional sculpture and is based on the idea of carving
a mesh by using slicing planes. The process of determining the slicing planes can
either be interactive or automated.
A framework is developed which allows user to sculpt shapes by using the in-
teractive and automated processes. The framework allows user to cut a source mesh
based on its edges, faces or vertices. The user can sculpt various kinds of developable
surfaces by cutting the parallel edges of the mesh. The user can also introduce in-
teresting conical patterns by cutting dierent vertex, edge, face combinations of the
mesh.
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Naghibi-Beidokhti, Mahdokht. "Les transformations harmoniques p-valentes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ38163.pdf.
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Brown, Neil John. "Novel organometallic mixed valence complexes." Thesis, Durham University, 2010. http://etheses.dur.ac.uk/417/.
Full textAbstract:
Organometallic mixed valence complexes have been studied extensively over the past 30 years providing many synthetic and theoretical challenges. This thesis has sought to provide the field with a unique family of mixed valence complexes through which theories of electron transfer in weakly coupled systems can be tested. The metal fragment Mo(dppe)(η7-C7H7) is unique amongst its half-sandwich counterparts providing low formal oxidation states and a well resolved EPR signal and forms the basis of these studies. Before undertaking a study of the electronic structure of [{(Mo(dppe)(η7-C7H7)}2{μ- C≡CXC≡C}]n+ systems, and associated issues regarding mixed valence characteristics and carbon-chain mediated metal-metal interactions, mono-metallic molybdenum acetylide complexes that serve as model systems were studied in detail and their electronic structure fully rationalised. Thus, in Chapter two, a range of para substituted molybdenum aryl acetylides, Mo(C≡CC6H4X-4)(dppe)(η7-C7H7), featuring a range of electron-donating and -withdrawing substituents, are described. These compounds have been studied using a range of spectroscopic, crystallographic, electrochemical, spectroelectrochemical, and computational techniques establishing metal centred oxidation character. This is a consequence of cycloheptatrienyl ring destabilising the filled dz2 metal d-orbtial which then forms the HOMO. The poor symmetry match of this dz2 orbital and the alkynyl π-system effectively decouples the molybdenum fragment from the alkynyl substituent. As a precursor to the synthesis and understanding of bi-metallic complexes containing all-carbon bridging moieties, a series of mono-metallic compounds containing diynyl and triynyl ligands have been studied in Chapter three. The subsequent elucidation of the influence of the length of the carbon chain on the electronic structure has been studied using a combination of spectroelectrochemical and computational techniques. These studies reveal that the length of the carbon chain, and the identity of the supporting ligand, (bipyridine or dppe) increases the chain character of the frontier orbitals. Homo-bimetallic complexes containing a bis(ethynyl) substituted para-carborane bridging moiety were synthesised (Chapter four) together with the monometallic complex Mo(C≡CC2B10H11)(dppe)(η7-C7H7). The mono-metallic complex was first synthesised and studied to establish how the ethynyl carborane affects the electronic structure of the Mo(dppe)(η7-C7H7) centre and the nature of interaction between the molybdenum centre, the ethynyl fragment and the carborane cage. This preliminary work was followed by the synthesis of the bimetallic complex, [{Mo(dppe)(η7- C7H7)}2{μ-C≡C(C2B10H10)C≡C}]. Using a range of spectroscopic, spectroelectrochemical and computational techniques the electronic structure, and charge transfer process of [{Mo(dppe)(η7-C7H7)}2{μ-C≡C(C2B10H10)C≡C}]n+ (n = 0, 1 or 2) have been explored. The monocation [{Mo(dppe)(η7-C7H7)}2{μ- C≡C(C2B10H10)C≡C}]+ has shown to be a genuine example of a valence trapped, weakly coupled mixed valence complex allowing conventional descriptions of the intervalence transition to be compared with TD-DFT based interpretations. The literature surrounding the area of poly-carbon ligand chemistry indicates that the butadiyndiyl bridging moiety is an efficient conduit for electron transfer, due to its two orthogonal π-systems that span across the entirety of the ligand, leading to systems which are generally delocalised. An investigation of the mixed valence complex, [{Mo(dppe)(η7-C7H7)}2(μ-C≡CC≡C)]+ reveals a weakly coupled, localised mixed valence electronic structure, which is unique amongst its poly-carbon counterparts (Chapter five). Through using a range of spectroscopic timescales (EPR /IR /UV /vis) the rate of electron transfer has been estimated. To fully account for the number of transitions in the NIR region and the shape of the resulting absorption bands, it is necessary to employ a three state approximation (which explicity indicates the bridge state) when describing the electron transfer process. The complex [{Mo(dppe)(η7-C7H7)}2{μ-C≡C(C6H4)C≡C}]n+ has been studied using a range of spectroscopic, electrochemical and computational methods to establish the nature and rate of electron transfer of the mixed valence complex (Chapter six). It has been demonstrated that the 1,4-diethynylbenzene bridge mixes more efficiently with the Mo(dppe)(η7-C7H7) than the 1,3-butadiyndiyl bridge. Spectroscopic analysis revealed a moderately coupled, localised mixed valence complex, where the rate of electron transfer is much faster than the diynyl complex but not faster than the infrared spectroscopy timescale. The application of the three state model in the description of the charge transfer process allows the increased electron transfer rate to be explained through the increased mixing of the bridge with the Mo(dppe)(η7-C7H7) moiety, characterised by the lowering of the LMCT transition in comparison to carboranyl and diynyl containing complexes. Metal complexes containing the cyanoacetylide moiety, C≡CC≡N, have been known for several decades, but despite the obvious synthetic advantages of cyanoacetylide as a bridging moiety compared to a butadiyndiyl bridge, C≡CC≡C, the C≡CC≡N ligand has been largely ignored. Chapter seven summarises attempts made to provide a convenient route to complexes containing the cyanoacetylide moiety so that a greater variety bimetallic complexes can be synthesised, thus allowing the investigation of the charge transfer characteristics of [{LxM}(μ-C≡CC≡N){MLx}]n+ complexes. Reactions of cyanogen bromide with metal acetylide complexes yield novel mono- and di- bromovinylidenes rather than cyano containing complexes. The cyanation reagent of choice is 1-cyano-4-dimethylaminopyridinium tetrafluoroborate ([CAP]BF4) which allows the ready synthesis of mono- and di-cyanovinylidenes, as well as the synthesis of cyanoacetylide containing complexes. The cyanating agent [CAP]BF4 is able to cyanate a range of metal acetylides, thus expanding the number of potential bimetallic complexes. The hetero-bimetallic complex [{Fe(dppe)(η5-C5H5)}(μ- C≡CC≡N){Mo(dppe)(η7-C7H7)}]PF6 has been synthesised and studied using a range of techniques and has demonstrated that the cyanoacetylide bridge promotes a more delocalised electronic structure for dicationic complexes than is found for the other ethynyl based ligands described in this thesis.
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MINGUEZ, RUBIO RAMON. "L'affaire Dreyfus à Valence (Espagne)." Dijon, 1989. http://www.theses.fr/1989DIJOL001.
Full textAbstract:
La première partie est un rappel des données historiques, du contexte espagnol, elle insiste sur la spécificité de Valence (tradition républicaine, effervescence d'une presse diversifiée) qui est un terrain privilégié pour l'appropriation du modèle français. La deuxième partie est consacrée à l'analyse de la presse. Une fiche signalétique est consacrée à chacun des journaux dont la tendance idéologique est dégagée et mise en relation avec les groupes et les fractions politiques. Par ailleurs, la liste de tous les articles parus sur l'affaire Dreyfus est donnée par journal et par ordre chronologique. La dernière partie montre comment Valence se mobilise dans un climat passionnel, à propos de "l'affaire" et comment chaque journal est amené à définir sa conception de la société : ainsi s'opèrent des glissements et des regroupements. L'analyse des réactions face au problème juif, à l'église, à l'armée et à la république permet de cerner la question et de démontrer que se développent les pôles extrêmes, en suivant la dichotomie dreyfusards antidreyfusards, au détriment des positions modérées. L'affaire Dreyfus determine une recomposition du paysage politique valencienThe first part is a reminder of the historical facts, and of the Spanish context. It emphasizes the specificity of Valence, (the republican tradition, the effervescence of a diversified press) which is a privileged terrain for the appropriation of a French model. The second part is dedicated to an analysis of the press. Each of the newspapers is presented in turn, giving its ideological tendency in relation with political groups and factions. Likewise, the list of all the articles which appeared on the Dreyfus affair is classified by newspapers and in chronological order. The last part shows the passionate reaction of Valence to the Dreyfus affair and how each newspaper and political group was led to define its conception of society, thus operating shiftings and regroupings. An analysis of the various reactions to the Jewish problem, to the church, to the army and the republic leads to a closer interpretation of the problem. It is found that two extremes developed through the Dreyfus affair, defined by the dichotomy Dreyfusards anti-Dreyfusards, to the detriment of the moderates. Thus a new political landscape appeared in valence
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Lombardi, Veronica <1974>. "Valenze di Qing nel Zhuangzi." Doctoral thesis, Università Ca' Foscari Venezia, 2004. http://hdl.handle.net/10579/625.
Full textAbstract:
L'analisi delle valenze che qing assume nel Zhuangzi mostra come i diversi
significati del carattere siano legati da un rapporto di mutua e logica derivazione e come siano tutti
riconducibili a una matrice comune che consente una descrizione coerente del concetto di qing nel
rispetto della sua polisemia.
Il significato fondamentale di qing si evidenzia nell'uso del termine in riferimento al Dao,
del quale indica le caratteristiche intrinseche, designando di conseguenza anche quelle di tutte le
cose, che del Dao sono manifestazione. Consistendo in ciò che le cose sono in sé per propria natura,
qing costituisce l'oggetto ideale della conoscenza, designando pertanto anche la verità dei fatti e la
veridicità delle parole. In relazione all'essere umano, qing ne designa in modo particolare la
naturale predisposizione a relazionarsi con l'altro e con l'ambiente in generale reagendo agli stimoli
da questi forniti; qing costituisce il processo reattivo e comunicativo peculiare all'uomo, processo in
cui la formulazione di giudizi, il sorgere di preferenze, emozioni, desideri e intenzioni si legano in
un rapporto di mutua derivazione e dipendenza.
Qing, indicando le caratteristiche intrinseche dell'uomo, si rivela affine a xing (natura
umana). Il carattere xing non occorre nella prima sezione del Zhuangzi, nella quale inoltre non si
riscontrano termini a esso pienamente corrispondenti e pertanto in grado di sostituirlo; l'analisi del
rapporto tra qing e xing e del contesto polemico che segna l'esplicita introduzione del tema di xing
nel testo induce a ipotizzare che l'assenza del carattere xing dal nucleo originario del Zhuangzi, non
impedendo al suo autore di trattare della natura umana, esprima il suo rifiuto di aderire alla
concezione propugnatane dai pensatori suoi contemporanei, in particolare da Mencio. Qing designa
le caratteristiche intrinseche della natura umana: la conservazione della purezza e della spontaneità
che costituiscono la dotazione originaria dell'uomo consente di preservare l'integrità di qing, e
dunque di xing, e di agire in modo morale; l'allontanamento da tale condizione porta all'alterazione
di qing e all'adesione a quei valori morali artificiali e convenzionali la cui imposizione il Zhuangzi
avversa.
Le valenze di qing riscontrate nel Zhuangzi sono attestate anche nelle altre opere del periodo
pre-Qin, le quali inoltre frequentemente impiegano il termine nel senso di "sentimento, emozione".
Si esclude che nel Zhuangzi qing possa assumere in maniera diretta tale accezione, per quanto
l'opera attribuisca un valore fondamentale alle emozioni, considerando le modalità della loro
espressione indice della qualità pura o alterata del qing dell'individuo e ritenendo che esse svolgano
un ruolo primario nel motivare nel singolo la volontà di ripristinare la purezza originaria del proprio
qing. Le opere coeve al Zhuangzi individuano nella spontaneità delle emozioni il segnale
dell'imperfezione morale di xing, indicando nella pratica rituale e nello studio i mezzi utili a
regolare le emozioni e a condurre alla moralità la natura umana. Diversamente, per il Zhuangzi xing,
essendo determinato dal Dao, all'origine è moralmente buono, così come di conseguenza le
emozioni in cui si esprime; la radice del male risiede nell'errore gnoseologico, che porta ad aderire
a conoscenze parziali che ostacolano la comprensione del Dao e dei valori che da esso discendono; i
limiti della conoscenza condizionano lo svolgersi del processo di reazione e comunicazione che è
parte costitutiva del qing dell'uomo causando il sorgere di emozioni inappropriate e smodate che
rivelano l'allontanamento dell'individuo dall'Autenticità. Il rifiuto del Zhuangzi di impiegare qing
nel senso di "emozione" e l'enfasi posta sul problema della conoscenza si ritiene esprimano il
rifiuto della concezione negativa delle emozioni e della natura umana propugnata dagli altri
pensatori del periodo pre-Qin.
The analysis of qing in the Zhuangzi shows that the different meanings the term
takes are connected in a relation of mutual and logical derivation, and that they all stem from a
common basis which allows to give the concept of qing a coherent description in full respect of its
polysemy.
Qing reveals its basic meaning in the occurrences in which it is used with reference to the
Dao, whose it indicates the intrinsic characteristics, therefore indicating also the intrinsic
characteristics of all the things, which of the Dao are manifestations. Being what things are in
themselves according to their nature, qing constitutes the ideal object of knowledge, and thus it also
denotes the truth of facts and words. In relation to human beings, qing particularly denotes man's
natural predisposition to interact with the other and generally with the surrounding environment by
reacting to the stimuli he receives from them; qing constitutes the reaction and communication
process peculiar to man, process in which the formulation of judgements, the rising of preferences,
emotions, desires, and intentions are connected in a relation of mutual derivation and dependence.
Qing, indicating man's intrinsic characteristics, reveals itself to be similar to xing (human
nature). The character xing does not occur in the first section of the Zhuangzi; the analysis of the
relation between qing and xing and of the polemical context marking the explicit introduction of the
topic of human nature in the work induces to hypothesize that the absence of the character from the
original core of the Zhuangzi, not preventing its author from dealing with the theme of human
nature, expresses his refusal towards the conception of xing held by the other thinkers of the period,
particularly by Mencius. Qing designates the intrinsic characteristics of human nature; the
preservation of the purity and spontaneity of man's original endowment allows to preserve the
integrity of qing, and hence of xing, and thus to act morally, whilst the deviation from the original
purity causes the authenticity of qing to be lost, and man to adhere to those artificial and
conventional moral values whose imposition the Zhuangzi refuses.
The meanings of qing found in the Zhuangzi are also attested in the other pre-Qin works, in
which, moreover, qing is often given the sense of "feeling, emotion"; the analysis of the text
induces to rule out the possibility for qing to take this meaning directly in the Zhuangzi, although
the work attributes a fundamental value to emotions, deeming the ways in which they are expressed
to betoken the pure or altered quality of the individual's qing, and believing emotions to play a
primary role in determining the individual's will to restore the original purity of his qing. The works
contemporary to the Zhuangzi deem the spontaneity of emotions to be the signal of man's moral
imperfection, indicating the ritual practice and learning as the means by which regulate emotions
and bring morality to human nature; differently, for the Zhuangzi xing, being determined by the Dao,
is morally good, and consequently also the emotions by means of which it expresses itself are
morally good. The Zhuangzi indicates the root of evil in the gnoseological mistake causing man to
adhere to partial forms of knowledge which hinder the understanding of the Dao and of the values
deriving from it; the limits of partial knowledge condition the carrying out of the reaction and
communication process which is constitutive part of man's qing, causing inappropriate and
excessive emotions to rise; such emotions reveal the individual's deviation from the Authenticity of
his nature. We believe the refusal of the Zhuangzi to use qing in the meaning of "emotion" and the
emphasis it puts on the problem of knowledge to be expression of the refusal of the authors of the
work towards the negative conception of emotions and of human nature held by the other thinkers
of the pre-Qin period.
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Franco, Debora Vilela. "Tratamento redutivo de solo e agua subterranea contaminados com cromo hexavalente." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249653.
Full textAbstract:
Orientador: Wilson de Figueiredo JardimTese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica
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Resumo: A redução química do cromo hexavalente, Cr(VI), presente em solo e água subterrânea contaminados, foi investigada empregando-se diferentes agentes redutores (batelada e semi-batelada) para avaliar a extensão da redução do Cr(VI) e da imobilização (precipitação) do cromo trivalente, Cr(III). O estudo comparativo envolvendo o uso de diferentes agentes redutores evidenciou que as espécies Fe(II) e FZVcol (nanopartículas estabilizadas com carboximetilcelulose) apresentaram os resultados mais promissores para a remoção do Cr(VI), visto que houve uma redução quantitativa desta espécie com sua concomitante imobilização. A aplicação do Fe(II) e FZVcol nas razões molares 1[Cr(VI)]:20[Fe(II)] e 1[Cr(VI)]:4[FZVcol] resultou na conversão redox superior a 98% e na imobilização das frações de Cr(VI) lábil e trocável. Foi verificado para o Fe(II), que o aumento da velocidade do fluxo volumétrico (G) resulta na diminuição do número de volume de poro para o tratamento do solo e da quantidade de Cr(VI) residual. O estudo hidrodinâmico teórico da coluna recheada com solo (meio poroso) permitiu mensurar o grau de dispersão do redutor na coluna frente ao modelo pistonado de escoamento em função de G mediante o cálculo do coeficiente de dispersão mássica volumétrico (kDV), o qual foi calculado a partir da modelagem da curva de saturação experimental. Foi verificado em todos os casos que a cinética do processo redox Cr(VI)/Cr(III) segue uma lei empírica de velocidade de pseudo-primeira ordem. A complexidade cinética do processo redox foi evidenciada pela dependência da constante de velocidade global de pseudo-primeira ordem (k*) com o tempo de reação, G e a concentração inicial do redutor. Um modelo cinético fenomenológico foi proposto para se obter uma expressão representativa de k* nas diferentes situações experimentais investigadas, bem como nos casos limites previstos. Um esquema reacional global foi proposto para representar os diferentes processos elementares envolvendo as espécies Cr(VI) e Cr(III) na matriz porosa (solo/água subterrânea). Um ensaio de tratamento em escala piloto foi realizado in situ tendo-se como balizadora as condições experimentais mais promissoras obtidas nos estudos realizados em escala laboratorial
Abstract: Chemical reduction of the hexavalent chromium, Cr(VI), present in contaminated soil and groundwater was investigated using several different reductants (batch and semi-batch) in order to evaluate the extension of Cr(VI) reduction and the immobilization (precipitation) of trivalent chromium, Cr(III). A comparative study concerning the use of different reductants revealed that Fe(II) and ZVIcol (nanoparticles stabilized with carboximethylcellulose) present the most promising findings for the Cr(VI) removal, since it was found that a quantitative reduction of this specie is accompanied by its immobilization. Application of Fe(II) and ZVIcol using the 1[Cr(VI)]:20[Fe(II)] and 1[Cr(VI)]:4[ZVIcol] molar ratios resulted in a redox conversion degree higher than 98% and in the immobilization of the labile and the exchangeable Cr(VI) fractions. It was verified for Fe(II) that increasing the volumetric flow rate (G) both the pore volume necessary for the redox treatment and the residual Cr(VI) decrease. The theoretical hydrodynamic study concerning the packed column reactor containing soil (porous medium) permitted to evaluate the reductant dispersion degree inside the column in relation to the plug-flow model as functions of G by measuring the volumetric mass dispersion coefficient (kVD), which was calculated from simulation of the experimental saturation curve. In all cases, it was found the kinetics of the Cr(VI)/Cr(III) redox process follows a pseudo-first order rate law. The complexicity concerning the kinetic process was evidenced by the dependence of the overall pseudo-first order kinetic rate constant (k*) on reaction time, G and the initial concentration of the reductant. A phenomenological kinetic model was proposed in order to obtain a relation capable to represent k* for the different experimental conditions investigated, as well for the possible limit cases. An overall reaction scheme was proposed in order to describe the different elementary processes concerning the Cr(VI) and Cr(III) species, which take place inside the porous soil matrix (soil/groundwater). A pilot scale test was carried out in situ taking into account the best experimental scenario obtained in laboratory.
Doutorado
Quimica Analitica
Doutor em Ciencias Quimicas
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Mintoff, E. "An urban renewal study for the historic city of Valetta." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371775.
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Lastra, de Natias Gilles. "José Ángel Valente : une certaine conception du langage : 1980-2000." Paris 8, 2005. http://www.theses.fr/2005PA082586.
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Ramos, Abreu José A. de Paulino Ayuso José. "La fascinación del enigma : la poética de José Angel Valente en sus ensayos /." Madrid : Fundación Universitaria Española, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=9788473927048.
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Gorden, John David. "Low valent and mixed valent cyclopentadienyl complexes of the group 13 elements." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3036602.
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Nordlöf, Magnus, and Anders Ohlsson. "Valet av hög revisionskvalité : Vilka faktorer beskriver valet?" Thesis, Umeå University, Umeå School of Business, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-1180.
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This paper analyzes the auditor choices for a sample of 300 predominantly small Swedish firms, all located in Umeå. Our hypothesis was based on the complexity of a firm, the need of external financing, leverage, and the need of extra consultance from the auditfirm. Our definition of auditor quality is based on prior studies, and is frequently used by authors in this area. The assumption is based on that the auditor quality increases with the size of the auditfirm and the degree of the auditor. The auditor quality is therefor depending on the choice between an auditor from the group “Big 5” or not, and the choice of an auditor with an higher degree. The conclusions of our study was:
• The size of the company was of great importance in both choices.
• Companies who’s in great need of extra consultance from the auditor chooses a higher level of audit quality in both choices.
• Companies in great need of external financing in an near future are dependent on an reliable financial reporting and are therefor also choosing a higer auditor quality in both cases.
• Companies with a high ratio of inventory and receivables to total assets wanted an auditor with a higher degree.
• We could not find any support for our second complexity-hypothesis, the ratio of salary expense to total operating expenses to reflect operational and informational complexity related to limitations on management’s scope of control. Support for the leveregae hypothesis or the sale-grow hypothesis was also not to be found.
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Macpherson, Brendan P. "Discrete cyano-bridged mixed valence systems /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17778.pdf.
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Ghiti, Ali. "Valence band engineering in semiconductor lasers." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/842853/.
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This thesis is concerned with the improvement of semiconductor laser characteristics using valence band engineering. We first show that the combination of strain and quantum confinement can confer considerable advantages to long wavelength lasers. With sufficient built-in strain, the highest hole subband has a low effective mass and is well separated from the lower bands. The low effective mass reduces the carrier density needed for population inversion and leads to the virtual elimination of two important loss mechanisms: Auger recombination and intervalence band absorption. We propose a specific strained-layer 1.55mum structure that can reduce the threshold current density and its temperature dependence and increase the luminescent efficiency. The presence of strain can also lead to an enhancement of the relaxation oscillation frequency due to the higher differential gain when compared to lattice-matched structures. The linewidth enhancement factor is also predicted to be reduced. Such strained-layer lasers could be of major significance for long distance optical communication. However, the long term stability of these structures, although promising, has still to be fully assessed. In view of this, we suggest that (111) growth of unstrained structures could provide the light-hole cap to the valence band needed for laser operation. We find that the threshold current density in thin (111) lasers could be reduced while the polarisation selection of TE modes could be improved compared to equivalent (001) lasers. Finally, we consider the effects of crystal orientation and of strain on the exciton binding energy.
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Costi, T. A. "Electronic properties of intermediate valence compounds." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355734.
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Kim, Joshua Ph D. Massachusetts Institute of Technology. "Amygdala circuits underlying valence-specific behaviors." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117881.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Biology, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 54-61).
Threatening and rewarding stimuli evoke a set of distinct stereotyped behaviors, which can be categorized as negative and positive valence-related behaviors, respectively. The stereotypic nature of negative and positive valence-related behaviors suggests that threatening and rewarding stimuli engage evolutionarily predetermined neural circuits in the brain. The amygdala is an important mammalian brain region that is activated by negative and positive stimuli and mediates negative and positive valence-related behaviors. The current prevailing circuit model of the amygdala mainly considers negative behaviors and only recently has cell-type specific models have been proposed. Hence, the substrates, genetically distinct neuronal populations, for negative and positive behaviors are not known. The work presented here describes a genetically-defined amygdala circuit model for negative and positive behaviors. Development of a genetic-based circuit model of the amygdala revealed anatomical and genetic circuit motifs that underlie that amygdala circuits that mediate valence-specific behaviors.
NIH Pre-Doctoral Training Grant T32GM007287 RIKEN Brain Science Institute
by Joshua Kim.
Ph. D.
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Maître, Philippe. "Etude valence bond de radicaux hypervalents." Paris 11, 1990. http://www.theses.fr/1990PA112343.
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Dans la premiere partie de ce travail, nous proposons une methode de calcul generale de configurations pour des fonctions d'onde valence bond (bv) en base non-orthogonale, de facon a obtenir des energies fiables en tout point d'une surface de potentiel, diabatique ou adiabatique. La methode, testee pour des calculs de distance d'equilibre, de frequences de vibration, d'energies de dissociation ou de barrieres de reaction est en excellent accord avec les meilleurs calculs de reference dans une base d'oa equivalente. Nous l'utilisons ensuite pour calculer quantitativement les courbes diabatiques des diagrammes de correlation vb pour les deux modeles de reaction d'echange x#?+xx|xxx|#. Xx+x#. (x=h, li). Notre analyse nous conduit a reformuler la theorie originale (modele a deux courbes), mais confirme son hypothese fondamentale selon laquelle le profil de la reaction est seulement relie a une simple propriete des reactifs: l'ecart singulet-triplet du dimere xx. La seconde partie est consacree a la verification, a l'aide de calculs ab initio casscf+ci, des predictions d'une extension a trois courbes des diagrammes vb concernant la stabilite de ph#4 et sih#5, ce dernier faisant l'objet d'une controverse experimentale. Nos calculs confirment la stabilite de ph#4 et l'instabilite de sih#5. Finalement, nous proposons un nouveau mecanisme qui explique la stereochimie (observee experimentalement) de la reaction de pseudorotation dans les radicaux phosphoranyles
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Dubouclez, Olivier. "Valère Novarina, la physique du drame /." [Dijon] : les Presses du réel, 2005. http://catalogue.bnf.fr/ark:/12148/cb400335277.
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Vieira, Gabriela Bonfanti. "Uso de nanopartículas de ferro zero-valente na remediação de solos contaminados." reponame:Repositório Institucional da UFSC, 2014. https://repositorio.ufsc.br/xmlui/handle/123456789/129389.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Química, Florianópolis, 2014.Made available in DSpace on 2015-02-05T21:02:07Z (GMT). No. of bitstreams: 1 328011.pdf: 1590822 bytes, checksum: 07452a98bd4db3a28fb335f757cc4fd3 (MD5) Previous issue date: 2014
Atualmente, a nanotecnologia tem sido estudada amplamente, podendo se tornar uma das mais importantes tecnologias ambientais. Uma das suas grandes vantagens é a sua aplicação na remediação de uma grande variedade de contaminantes, além de promover a redução nos custos e obter maiores eficiências de remediação. Estudos recentes têm demonstrado a importância potencial das nanopartículas de ferro na remediação ambiental. Contudo, são necessários estudos mais detalhados para quantificar parâmetros que influenciam o processo de síntese das nanopartículas, a degradação dos compostos orgânicos e o comportamento destes nos solos e aquíferos. Este trabalho estuda a produção de nanopartículas de ferro zero-valente, para posterior utilização na remediação de solos contaminados. As nanopartículas de ferro zero-valente (nZVI) foram sintetizadas pelo método de redução do ferro férrico usando boroidreto de sódio como agente redutor em condições atmosféricas. As nanopartículas de ferro são obtidas, principalmente, no estado de valência zero, sem oxidação, e permanecem assim durante mais de 20 dias. A eficiência das nanopartículas de ferro na degradação de compostos orgânicos também foi estudada e o corante azul de metileno foi selecionado como contaminante orgânico, com o objetivo de caracterizar o processo de degradação/adsorção do contaminante, enfatizando a determinação de parâmetros cinéticos. Na caracterização das nanopartículas, tanto comerciais como as sintetizadas em laboratório, foram realizadas análises de DRX e MET. O diâmetro das nanopartículas de ferro, tanto as comerciais quanto as sintetizadas, ficou na faixa de 0-100 nm. No estudo da cinética de degradação do corante pelas nanopartículas, os resultados mostraram que a reação é do tipo pseudo-segunda ordem, com a constante de velocidade específica de 6,76*10-8 s-1. No estudo de adsorção entre o corante e o solo, os resultados mostraram melhor ajuste dos dados pela equação de Langmuir, com uma quantidade máxima de corante adsorvido de 0,855 mgAM*gareia-1 e uma constante de Langmuir no valor de 3,310 L*mgAM-1. No estudo em coluna de leito fixo, os resultados mostraram que as nanopartículas de ferro zero-valente influenciam no tempo de saturação da coluna pelo contaminante. O teste de adsorção do corante no solo em coluna obteve um tempo para o início de sua saturação de 12 horas, os teste de degradação do corante com nZVI em coluna resultou em um tempo de 15 horas para o início da saturação para a coluna com 0,64% de nZVI, para a coluna com 0,96% de nZVI o tempo foi de 25 horas e para a coluna com 1,28% de nZVIum tempo de degradação de 45 horas ainda não havia iniciado a saturação. A degradação do corante foi confirmada pela análise de carbono orgânico total, onde a relação entre quantidade de carbono e a coloração mostra a quebra do composto orgânico. Um modelo de leito fixo foi utilizado para simular o estudo em coluna, o qual não se adequou aos dados experimentais. Os resultados obtidos a partir da caracterização das nanopartículas sintetizadas em laboratório mostram que o método de síntese empregado, além de ser de fácil realização, proporciona bons resultados. A sua semelhança com as nanopartículas comerciais garantem que podem ser utilizadas na remediação de solos e água contaminados. Neste aspecto, os resultados obtidos no estudo em coluna mostraram que o corante foi degradado pelas nanopartículas de ferro e que a quantidade de nZVI influencia diretamente no tempo de degradação. Os resultados também indicam que as interações entre o ferro e o corante com o solo devem ser consideradas nas aplicações ambientais.
Abstract : Currently, the nanotechnology has been studied extensively, becoming one of the most important environmental technologies. One of its great advantages is its application in the remediation of a wide variety of contaminants, promoting the reduction in costs and getting greater efficiencies remediation. Recent studies have demonstrated the potential importance of iron nanoparticles in environmental remediation. However, more detailed studies are needed to quantify parameters that influence the process of nanoparticle synthesis, degradation of organic compounds and their behavior in soils and aquifers.This paper studies the production of nanoparticles of zero valent iron for later use in the remediation of contaminated soil. Nanoparticles zerovalentiron (nZVI) were synthesized by reducing ferric iron method using sodium borohydride as reducing agent at atmospheric conditions. The iron nanoparticles are obtained mainly in the zero valence state, without oxidation, and remain so for more than 20 days. The efficiency of iron nanoparticles in the degradation of organic compounds was also studied and the dye methylene blue was selected as the organic contaminant, in order to characterize the process of degradation / adsorption of the contaminant, emphasizing the determination of kinetic parameters.In the characterization of nanoparticles, both commercial and synthesized in the laboratory, XRD and TEM were performed. The diameter of iron nanoparticles, both the commercial and the synthesized, was in the range of 0-100 nm. In the study of the kinetics of degradation of the dye by the nanoparticles, the results showed that the reaction type is pseudo-second order, with the specific rate constant of 6.76*10-8 s-1. In the study of the adsorption between the dye and the soil, the results showed a better fit of the data to the Langmuir equation with a maximum amount of dye adsorbed 0.855 mgMB*gareia-1 and a Langmuir constant 3.310 L*mgMB-1.In this study fixed bed column, the results showed that zerovalent iron nanoparticles affect the time saturation of the column by contaminant. The test of adsorption of dye into the soil column obtained a time for the beginning of saturation of 12 hours, the degradation of the dye test with nZVI in column resulted in a time of 15 hours for the beginning of saturation the column with 0.64% of nZVI, for the column with 0.96% of nZVI the time was 25 hours and for the column with 1.28% of nZVI in a degradation time of 45 hours had not yet started to saturation. The degradation of the dye was confirmed by analysis of total organic carbon, where the relationship between carbon amount and the color shows the breakdown of the organic compound. A fixed bed model wasused to simulate the column study, which didn?t adapt to the experimental data..The results obtained from the characterization of nanoparticles synthesized in the laboratory show that the method employed, besides being easy to perform, gives good results. Its resemblance to the commercial nanoparticles insures that can be used in the remediation of soil and water contaminated. In this regard, the results obtained in column showed that the dye was degraded by iron nanoparticles and the amount of nZVI influences directly in the time of degradation. The results also indicate that interactions between iron and dye with the soil should be considered in environmental applications.
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MARQUES, J. R. S. "A Construção da Imagem do Imperador Valente na Obra de Sócrates Escolástico." Universidade Federal do Espírito Santo, 2009. http://repositorio.ufes.br/handle/10/3436.
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Previous issue date: 2009-11-04Sócrates Escolástico foi um dos historiadores da Igreja que viveu e produziu no início do século V d.C. Em sua obra, História da Igreja, descreveu a evolução dessa instituição tendo como eixo cronológico o governo dos Imperadores Romanos. Referindo-se a um contexto de formação da basileia, a realeza sagrada romano-bizantina, que demandava atributos específicos dos Imperadores, emitiu opiniões sobre o desempenho desses. Sobre alguns escreveu de forma benevolente e laudatória, porém sobre outros fez severas críticas, como se não estivessem à altura do cargo que, por delegação divina, exerciam, atribuindo-lhes inclusive a responsabilidade pelas catástrofes naturais, por invasões de povos bárbaros e pelas tentativas de usurpação do trono que, de quando em vez, assolavam o Império Romano. Com seus comentários ajudou a construir uma representação negativa dos adversários do que ele considerava como ortodoxia, bem como a estigmatizar a imagem de Valente, Imperador da parte oriental do Império Romano de 364 até 378 d.C., uma vez que esse Imperador, cristão da seita ariana, portanto herege, perseguiu, por vezes com extrema violência, os cristãos nicenos, facção que predominou como ortodoxa, a qual, Sócrates Escolástico apoiava. Palavras-chave: Valente; heresia; Arianismo; estigmatização.
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Davis, Matthew Harris. "A Bond Valence-Based Force Field: A Multi-Body Approach." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3796.
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The typical form for a molecular mechanics force field consists of a foundation of pair-wise terms to describe bonded and non-bonded atomic interactions, with multi-body correction terms to deal with the limitations of pair-wise terms. I present here the first attempts of a molecular mechanics model that is founded on multi-body terms, which are based on the Bond Valence Model (Brown, 2002) and recent developments in the Vectorial Bond Valence Model (Bickmore et al., 2013a; Harvey et al., 2006). I calibrated these models on pressure vs. energy curves for a set of SiO2 polymorphs. The average deviation for the best-fit iteration, with only six adjustable parameters was ±1.98 kcal/mol.
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Silva, Sandra Rodrigues da. "Análise do impacto na redução de pneumonia adquirida na comunidade em crianças após a introdução da vacina antipneumocócica 10-valente no Programa Nacional de Imunização." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/17/17139/tde-30062015-155505/.
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O Streptococcus pneumoniae (pneumococo) constitui um dos mais importantes patógenos bacterianos do trato respiratório, podendo causar infecções invasivas e não invasivas, levando a altas taxas de morbimortalidade, particularmente em crianças menores de cinco anos de idade. A bactéria ganha acesso ao hospedeiro através da colonização da nasofaringe, que representa um importante reservatório para a transmissão deste patógeno na comunidade, contribuindo para a disseminação horizontal de pneumococo entre os indivíduos de uma população. As doenças respiratórias causadas por pneumococo constituem em uma das prioridades atuais em Saúde Pública, recebendo atenção destacada das organizações internacionais da área da saúde, como a Organização Mundial da Saúde. No presente trabalho procura-se conhecer e avaliar a ocorrência da pneumonia adquirida na comunidade (PAC) antes e após a implantação no Calendário Vacinal da Vacina Pneumocócica-10 Valente Conjugada em 2010, na área de abrangência da Superintendência Regional de Saúde (SRS) de Alfenas/MG. Foi realizado um estudo ecológico com componente temporal que incluiu registros de crianças menores que um ano de idade, vacinadas e não vacinadas com a vacina antipneumocócica 10-valente conjugada, no período pré e pós inclusão da vacina no PNI nos municípios da Superintendência Regional de Saúde (SRS) de Alfenas/MG, sendo a vacinação o fator de exposição e a ocorrência de PAC o desfecho, utilizando dados anuais secundários por município para cálculo da cobertura vacinal e das taxas de morbidade por pneumonia em menores de um ano no período de 2007 a 2013. Considerando se os 26 municípios da SRS de Alfenas, houve redução significativa do número de casos de PAC em crianças abaixo de um ano de idade, cuja Razão de Prevalência foi de 0,81 (IC95%: 0,74 0,89; p<0,05). Mesmo com um tempo reduzido de uso, a vacina pneumocócica conjugada 10 valente apresentou um impacto relevante na redução de PAC em crianças, ajustada por cobertura vacinal no período pós vacinação (2011-2013), sendo estatisticamente significativa na maioria dos municípios, o que sugere a efetividade da vacina PCV-10 na prevenção de casos da doença em crianças menores de um ano de idade.The Streptococcus pneumoniae (pneumococcus) is one of the most important bacterial pathogens of the respiratory tract, may cause invasive and non-invasive infections, leading to high morbidity and mortality rates, particularly in children under five years of age. The bacteria gain access to the host through the nasopharyngeal colonization, which is an important reservoir for the transmission of this pathogen in the community, contributing to the horizontal spread among individuals in a population. Respiratory diseases caused by pneumococcus are in one of the current priorities in Public Health, receiving outstanding attention of international organizations in the health field, such as the World Health Organization. In the present study we aimed to understand and evaluate the occurrence of community acquired pneumonia (CAP) before and after implantation in 10- valent pneumococcal conjugate vaccine in 2010, on the coverage area of the Regional Health Service (SRS) of Alfenas / MG. An ecological study with temporal component was conducted which included records of children under one year old, vaccinated and not vaccinated with 10-valent pneumococcal conjugate vaccine, before and after period inclusion of the vaccine in PNI, in the municipalities of SRS of Alfenas / MG, with vaccination the exposure factor and the occurrence of CAP the outcome, using annual data side by municipality to calculate vaccination coverage and pneumonia morbidity in children under one year old, in the period 2007 to 2013. Considering the 26 municipalities of SRS Alfenas, there was a significant reduction in the number of CAP cases in children under one year old. The prevalence ratio was 0.81 (95%CI: 0.74 - 0.89; p<0.05). Even with a short period of use, the 10-valent pneumococcal conjugate vaccine had a significant impact on the reduction of CAP in children, adjusted for immunization coverage in the post vaccination period (2011-2013) and was statistically significant in most municipalities, which suggests the effectiveness of PCV-10 vaccine in preventing cases of the disease in children under one year of age.
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Lapenna, Michela. "Superconduttività alle alte temperature: resonating valence bond." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18734/.
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La presente tesi segue l’evoluzione storica delle scoperte e delle teorie nell’ambito della superconduttività.
Nel primo capitolo vengono trattati gli aspetti principali della teoria BCS, la cui denominazione è data dall’unione delle inziali dei suoi ideatori.
Questa teoria costituisce la prima descrizione generale dei materiali superconduttori ed è il riferimento solido delle teorie successive.
La teoria BCS riesce a spiegare il comportamento dei materiali superconduttori convenzionali con bassa temperatura critica, ma non è risultata sufficiente per comprendere la superconduttività alle alte temperature.
Nel secondo capitolo viene esposta la teoria RVB del Resonating Valence Bond, che nasce come prima risposta alla scoperta dei materiali superconduttori con alta temperatura critica.
La teoria RVB è una delle tante teorie nate a completare la teoria BCS e a differenza di questa non è riconosciuta all’unanimità.
Le conferme alla teoria RVB sono attualmente ricercate nel regime di pseudo-gap che precede lo stato superconduttivo nei materiali superconduttori non convenzionali.
Nel terzo capitolo vengono presentati i risultati più rilevanti dell’analisi dello pseudo-gap.
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Lancaster, Kelly. "Intramolecular electron transfer in mixed-valence triarylamines." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31709.
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Thesis (Ph.D)--Chemistry and Biochemistry, Georgia Institute of Technology, 2010.Committee Chair: Bredas, Jean-Luc; Committee Member: Kippelen, Bernard; Committee Member: Marder, Seth; Committee Member: Orlando, Thomas; Committee Member: Sherrill, David. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Michaels, Hannes. "Cu(I)/(II) mixed-valence Coordination Polymers." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-330861.
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Poyraz, Mehmet. "Valence localisation in transition metal cluster complexes." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389271.
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Fernández, Victor Leandro. "Semantica de sociedades para logicas n-valentes." [s.n.], 2001. http://repositorio.unicamp.br/jspui/handle/REPOSIP/279509.
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Orientador : Marcelo Esteban ConiglioDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Filosofia e Ciencias Humanas
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Mestrado
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Maclean, Ewan Douglas William. "Valence losses at interfaces in aluminium alloys." Thesis, Connect to e-thesis, 2002. http://theses.gla.ac.uk/917/.
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Thesis (Ph.D.) -- University of Glasgow, 2002.Ph.D. thesis submitted to the Department of Physics and Astronomy and the Department of Chemistry, University of Glasgow, 2002. Includes bibliographical references. Print version also available.
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Latouille, Jean-Jacques Avanzini Guy. "L'université de Valence en Dauphiné (1452-2000)." Lyon : Université Lumière Lyon 2, 2003. http://theses.univ-lyon2.fr/sdx/theses/lyon2/2003/latouille_jj.
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Dallabrida, Sara. "Analizzare testi con la grammatica delle valenze." Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/368551.
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Scopo della tesi è analizzare testi in sincronia (ma anche in diacronia) e di diversa natura (discorsi e interviste politici, racconti letterari, testi pratici, articoli di giornale) attraverso la grammatica delle valenze, o meglio attraverso l'analisi di omissioni e aumenti argomentali in contesti dati. L'intento è quello di mostrare come omissioni e aumenti argomentali contribuiscano a creare nei contesti considerati modificazioni semantiche ed effetti comunicativi differenti (ma anche ricorrenti), rilevanti per la stessa comprensione dei testi. La tesi è articolata in quattro capitoli che sviluppano i seguenti argomenti: a) la teoria della valenza di Tesnière e la sua ricezione; b) l'applicazione della grammatica delle valenze ai testi; c) le omissioni argomentali (aspetti teorici e analisi applicata ai testi); d) gli aumenti argomentali di verbi e nomi atmosferici (aspetti teorici e analisi applicata ai testi). Il tipo di analisi svolta mette a disposizione sia dati utili a livello teorico, sia materiale linguistico autentico commentato spendibile anche in ambito didattico.
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Ceder, David M. "Det Aktiva Valet." Thesis, KTH, Fastigheter och byggande, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102088.
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Sverige är ett land med ett mycket utvecklat sparande. Fondsparandet har genom åren gått från något som endast berörde några få till att hamna i svenskens vardagsrum. Detta breda fondsparande har även gett upphov till en diskussion om aktiv förvaltning fungerar, samt vad man egentligen får för de avgifter fondbolagen kräver. Syftet med denna uppsats är att granska om det finns bevis för att aktiv fondförvaltning skapar ett värde för investeraren. Uppsatsen inleds med en bakgrund som kommer redogöra för hur den svenska fondmarknaden ser ut i dagsläget samt dess historiska utveckling. Vidare kommer det under teorin redogöras för en rad tidigare forskning inom aktiv förvaltning. Det kommer även förklaras vad hypotesen om effektiva marknader är och vad den innebär. I empiren genomförs en undersökning av några av de största Sverigefonderna med målet att utreda deras prestation mot jämförelseindex. I analysavsnittet kommer resultaten från undersökningen att analyseras och sammanfattas. Efter en sammanställning av tidigare forskning finner man ett blandat resultat. En del forskning når slutsatsen att aktivt förvaltade fonder ej överpresterar sina jämförelseindex. Samtidigt som annan forskning når den motsatta slutsatsen om att aktiva fonder visar en bättre avkastning än jämförelseindex. Efter en genomgång av tidigare forskning går det ej att dra några otvivelaktiga slutsatser om att aktiv förvaltning skapar ett värde. Den undersökning som genomförs visar att en stor majoritet av de valda fonderna underpresterat sitt jämförelseindex under den utvalda perioden. Slutsatsen nås att aktiv förvaltning kan löna sig under särskilda marknadsförhållanden men att fonderna generellt har svårt att prestera bättre än sitt jämförelseindex. Detta tillsammans med höga förvaltningsavgifter gör aktivt förvaltade fonder till ett dyrt och ineffektivt sparande.
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Lindell, Monika. "Valet till universitetet." Thesis, Malmö universitet, Fakulteten för lärande och samhälle (LS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-30425.
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I undersökningen studerades hur en individ väljer program till universitetet. Syftet med undersökningen var att undersöka hur omgivningen samt individens perspektiv påverkar valet till universitetet. För att söka svar på det har jag genomfört en kvalitativ undersökning med sex studenter som studerar vid universitetet. Analysen av det empiriska materialet bygger på begrepp från Careership, SCCT och Pierre Bourdieu. Begreppen som tillämpas i studien är habitus, handlingshorisont, upplevd självförmåga, personliga mål och förväntat resultat. Resultatet av undersökningen visar att individer påverkas av föräldrarna när det gäller valet av program på universitetet. Även släktingar påverkar genom att rekommendera programmet eller att vara verksamma inom yrket. Det förefaller vara så att föräldrars och släktingars påverkan begränsar möjligheterna till att välja bland programmen på universitetet. Gymnasietiden påverkar intervjupersonerna när det gäller valet av program till universitetet. Det verkar som att den tiden utvidgar intervjupersonernas möjligheter när det gäller valet av program. Intervjupersonerna har tilltro till sin förmåga att klara av ett program på universitetet. De kan mäta sina prestationer på gymnasiet och välja ett program att söka för att testa om de kommer in. Ett mål med utbildningen och samtidigt ett resultat av utbildningen som kommer fram i intervjupersonernas berättelser är hur betydelsefullt det är att få ett arbete.