• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 6
  • 4
  • 1
  • Tagged with
  • 12
  • 4
  • 4
  • 3
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Latin satirical writing subsequent to Juvenal,

Weston, Arthur Harold, January 1915 (has links)
Thesis (PH. D)--Yale University, 1911. / Bibliography: p. 158-163.
2

The voice of the satirist in medieval Occitan poetry

Leglu, Catherine Elisabeth January 1995 (has links)
No description available.
3

Dipolos de cor e interações a altas energias / Color dipoles and high energies interaction

Souza, Maria Simone Kugeratski 21 May 2007 (has links)
A altas energias o n\\\'ucleon (ou o n\\\'ucleo) pode ser visto como um sistema denso de gl\\\'uons, o condensado de vidro de cor. Neste trabalho estudamos a intera\\c\\~ao deste sistema com dipolos de cor. Esta intera\\c\\~ao \\\'e representada pela se\\c\\~ao de choque dipolo-alvo, a qual \\\'e modelada. Utilizamos alguns dos modelos propostos na literatura para descrever os dados do HERA e do RHIC e propusemos uma nova parametriza\\c\\~ao que \\\'e capaz de descrever estes dados simultaneamente, demonstrando a propriedade de universalidade do condensado de vidro de cor. Generalizamos o modelo proposto por Iancu, Itakura e Munier para o caso nuclear e o aplicamos ao estudo de espalhamento el\\\'etron-n\\\'ucleo. Estimamos a influ\\^encia dos efeitos de satura\\c\\~ao nos observ\\\'aveis que ser\\~ao medidos no futuro eRHIC. Conclu\\\'imos entre outras coisas, que uma grande fra\\c\\~ao dos eventos observados ser\\~ao do tipo difrativo. Finalmente usamos a id\\\'eia de dipolo de cor para estudar a se\\c\\~ao de choque charmonium-h\\\'adron. / At high energies a nucleus (and even a nucleon) becomes a dense gluonic system called the color glass condensate. In this work we study the interaction of this dense system with color dipoles. This interaction is represented by the dipole-target cross section, which has to be modeled. We have used, without success, some of the existing models to try to reproduce the data obtained at HERA and RHIC. It was not possible to obtain a global agreement between the models and the two sets of data. We have then proposed a different parametrization of the dipole cross section, which is now compatible with all the available data. In the case of deep inelastic scattering, we have extended the Iancu-Itakura-Munier model to nuclear targets and made predictions for observables to be measured in the future electron-ion collider eRHIC. Among other things, we have concluded that a large fraction of the events will be of the diffractive type. Finally, we have used the color dipole approach to build a simple model for the charmonium-hadron interaction at high energies.
4

Estudo da din??mica da satura????o do solo e suas consequ??ncias no processo de escoamento superficial na Unidade Hidrogr??fica do Riacho Fundo

Stragliotto, Cleber 26 April 2010 (has links)
Submitted by Sara Ribeiro (sara.ribeiro@ucb.br) on 2017-08-16T20:51:59Z No. of bitstreams: 1 CleberStragliottoDissertacao2010.pdf: 3838856 bytes, checksum: b2b8847ea974023e84ea8b6bb6c14cf1 (MD5) / Approved for entry into archive by Sara Ribeiro (sara.ribeiro@ucb.br) on 2017-08-16T20:52:05Z (GMT) No. of bitstreams: 1 CleberStragliottoDissertacao2010.pdf: 3838856 bytes, checksum: b2b8847ea974023e84ea8b6bb6c14cf1 (MD5) / Made available in DSpace on 2017-08-16T20:52:05Z (GMT). No. of bitstreams: 1 CleberStragliottoDissertacao2010.pdf: 3838856 bytes, checksum: b2b8847ea974023e84ea8b6bb6c14cf1 (MD5) Previous issue date: 2010-04-26 / This paper addresses a topic of great importance for planning and environmental management in areas of severe urban occupation, as the Federal District. The Riacho Fundo Hydrographic Unit stands out for its importance in the composition of the drainage system of Paranoa Lake and been suffering because of influences of urbanization, imposed by the population. Urbanization, without proper planning, acts as a constraint of the processes related to runoff, facilitating the occurrence of problems such as flood peaks in the towns, dragging of sediments into the water bodies, increased susceptibility to erosion and changes in water regime. The runoff is generated from the point at which the precipitated water has no more ability to infiltrate the soil, to seep through on this in the form of a continuous flow. The factors that accentuate the process of runoff are the removal or replacement of native vegetation cover and soil sealing by urban systems. Another important phenomenon studied in this research, and direct influence on the runoff, was the ability of soil saturation. Soils that tend to saturate more easily are more likely to lead processes related to runoff, deserving areas where they are most attention when it comes to urban planning. / O presente estudo aborda uma tem??tica de grande import??ncia para o planejamento e gest??o ambiental em ??reas de acentuada ocupa????o urbana, como o Distrito Federal. A Unidade Hidrogr??fica do Riacho Fundo se destaca pela sua import??ncia na composi????o do sistema de drenagem do Lago Parano?? e pelo fato de estar sofrendo influ??ncias do processo de urbaniza????o imposto pela popula????o. A urbaniza????o, sem o devido planejamento, atua como condicionante dos processos vinculados ao escoamento superficial, facilitando a ocorr??ncia de problemas como picos de enchentes nas cidades, arraste de sedimentos para os corpos h??dricos, aumento da susceptibilidade de eros??es e altera????es no regime h??drico. O escoamento superficial ?? gerado a partir do ponto em que a ??gua precipitada n??o apresenta mais a capacidade de infiltrar no solo, passando a escoar sobre este sob a forma de um fluxo cont??nuo. Os fatores que mais acentuam o processo de escoamento superficial s??o a retirada ou substitui????o da cobertura vegetal nativa e a impermeabiliza????o do solo pelos sistemas urbanos. Outro importante fen??meno analisado neste estudo, e de influ??ncia direta sobre o escoamento superficial, foi a capacidade de satura????o do solo. Solos que tendem a saturar com mais facilidade s??o mais suscept??veis de desencadear os processos vinculados ao escoamento superficial, merecendo as ??reas em que se encontram maior aten????o no que tange ao planejamento urbano.
5

Dipolos de cor e interações a altas energias / Color dipoles and high energies interaction

Maria Simone Kugeratski Souza 21 May 2007 (has links)
A altas energias o n\\\'ucleon (ou o n\\\'ucleo) pode ser visto como um sistema denso de gl\\\'uons, o condensado de vidro de cor. Neste trabalho estudamos a intera\\c\\~ao deste sistema com dipolos de cor. Esta intera\\c\\~ao \\\'e representada pela se\\c\\~ao de choque dipolo-alvo, a qual \\\'e modelada. Utilizamos alguns dos modelos propostos na literatura para descrever os dados do HERA e do RHIC e propusemos uma nova parametriza\\c\\~ao que \\\'e capaz de descrever estes dados simultaneamente, demonstrando a propriedade de universalidade do condensado de vidro de cor. Generalizamos o modelo proposto por Iancu, Itakura e Munier para o caso nuclear e o aplicamos ao estudo de espalhamento el\\\'etron-n\\\'ucleo. Estimamos a influ\\^encia dos efeitos de satura\\c\\~ao nos observ\\\'aveis que ser\\~ao medidos no futuro eRHIC. Conclu\\\'imos entre outras coisas, que uma grande fra\\c\\~ao dos eventos observados ser\\~ao do tipo difrativo. Finalmente usamos a id\\\'eia de dipolo de cor para estudar a se\\c\\~ao de choque charmonium-h\\\'adron. / At high energies a nucleus (and even a nucleon) becomes a dense gluonic system called the color glass condensate. In this work we study the interaction of this dense system with color dipoles. This interaction is represented by the dipole-target cross section, which has to be modeled. We have used, without success, some of the existing models to try to reproduce the data obtained at HERA and RHIC. It was not possible to obtain a global agreement between the models and the two sets of data. We have then proposed a different parametrization of the dipole cross section, which is now compatible with all the available data. In the case of deep inelastic scattering, we have extended the Iancu-Itakura-Munier model to nuclear targets and made predictions for observables to be measured in the future electron-ion collider eRHIC. Among other things, we have concluded that a large fraction of the events will be of the diffractive type. Finally, we have used the color dipole approach to build a simple model for the charmonium-hadron interaction at high energies.
6

The Relationship between Horace's Sermones and Epistulae Book 1: "Are the Letters of Horace Satires?"

Whybrew, Linda Christine January 2006 (has links)
"Are the Letters of Horace Satires?" (Hendrickson 1897: 313). In response to this question, this thesis investigates whether Horace's Sermones and Epistulae 1 all belong to the genre of satura. Ancient and modern evidence from the use of the terms Sermones, Epistulae, and satura, is surveyed, and is found to be inconclusive, but not to preclude Epist. 1 as satura. The nature of specifically Horatian satura is ascertained from the text of Serm. 1, especially Serm. 1.1 and the explicitly literary Serm. 1.4 and 1.10. The redefinition of Lucilian satura, and its political implications are also considered. To confirm Epist. 1 as satura a sequential reading of the three libelli is undertaken, tracing the evolution of the theme of locus: place, both as geographical location, and as status, place in the social hierarchy, in the context of the socio-political environment of the time of composition. Serm. 1.1 as a programmatic poem is shown to establish Epicurean moderation as a prerequisite for a vita beata. In Serm. 1 Horace's status as client-poet of Maecenas and Octavian initially permits this ideal lifestyle in the Urbs. The misperceptions of outsiders lead to a preference for a life of Epicurean quietude in the rus in Serm. 2, although Horace's aequanimitas is disturbed by urban officia, and abuse of libertas dicendi associated particularly with Stoicism. The ideal of rural withdrawal is reinforced in Epist. 1 through an exploration of appropriate behaviour in relationships with potentes amici. Horace's addressees cover the entire range of the social hierarchy, and in his letters he utilizes the arguments of moral philosophy, thus reconciling poetry and philosophy. He achieves a pragmatic compromise whereby he can enjoy libertas in his role as a poet, while acknowledging that personal libertas and true aequanimitas are still to be attained.
7

Processo para remo??o de hidrocarbonetos pesados do g?s natural via absor??o

Gomes, Cicero Sena Moreira 18 July 2014 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-04-25T18:09:18Z No. of bitstreams: 1 CiceroSenaMoreiraGomes_TESE.pdf: 4483917 bytes, checksum: 669af2c1e4c7f9c1c1d4631126d1c1c0 (MD5) / Approved for entry into archive by Monica Paiva (monicalpaiva@hotmail.com) on 2017-04-25T18:15:55Z (GMT) No. of bitstreams: 1 CiceroSenaMoreiraGomes_TESE.pdf: 4483917 bytes, checksum: 669af2c1e4c7f9c1c1d4631126d1c1c0 (MD5) / Made available in DSpace on 2017-04-25T18:15:55Z (GMT). No. of bitstreams: 1 CiceroSenaMoreiraGomes_TESE.pdf: 4483917 bytes, checksum: 669af2c1e4c7f9c1c1d4631126d1c1c0 (MD5) Previous issue date: 2014-07-18 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / A utiliza??o do g?s natural vem crescendo ano ap?s ano em todo o mundo e tamb?m no Brasil. Verifica-se que nos ?ltimos cinco anos o perfil de consumo de g?s natural veicular ganhou um grande alcance e v?rios investimentos foram realizados nesta ?rea. Na ind?stria do petr?leo a utiliza??o do g?s natural para combust?vel no acionamento de motores j? vem de longa data, e o mesmo ? utilizado tamb?m para movimentar equipamentos, ou ainda, para gerar energia el?trica. Tais motores baseiam-se no ciclo motor de combust?o Otto, que requer um g?s natural com especifica??o bem definida, conferindo caracter?sticas antidetonantes necess?rias ao desempenho de equipamentos com projetos baseados neste ciclo. Esta tese prop?e a abordagem de aplica??o de duas opera??es simples, ou seja , a absor??o seguida por um flash para regenerar o solvente . Esta abordagem pode ser aplicada em ?reas de produ??o remotas. Com base em simula??es de processo e propriedades f?sico-qu?micas , ?lcool isooct?lico foi selecionado como absorvente para esta an?lise. As medi??es de absor??o de escala de laborat?rio s?o apresentadas usando um g?s natural sint?tico e an?lise de cromatografia em linha. Tamb?m s?o descritos os resultados de c?lculo de dados de equil?brio l?quido-vapor de alcanos e ?lcool atrav?s da equa??o Soave-Redlich-Kwong de estado (EoS) modificada com a fun??o alfa e par?metros da regra de mistura (van der Waals e UNIFAC). Com base nas medi??es e c?lculos EoS foram fornecidas as curvas de opera??o e de equil?brio. Uma s?rie sistem?tica de simula??es de absor??o GN de esp?cies pesadas seguido por um regenerador solvente flash ? apresentada e discutida. Apresenta-se tamb?m um piloto de absor??o de g?s set-up at? 70 bars que ? capaz de avaliar a escala e efeito da press?o. ?, assim, demonstrado tanto experimental e computacionalmente que a abordagem proposta de absor??o de esp?cies C5 + do GN ? simples e vi?vel para especificar o ?ndice de metano do g?s de combust?o para aplica??es remotas. / A utiliza??o do g?s natural vem crescendo ano ap?s ano em todo o mundo e tamb?m no Brasil. Verifica-se que nos ?ltimos cinco anos o perfil de consumo de g?s natural veicular ganhou um grande alcance e v?rios investimentos foram realizados nesta ?rea. Na ind?stria do petr?leo a utiliza??o do g?s natural para combust?vel no acionamento de motores j? vem de longa data, e o mesmo ? utilizado tamb?m para movimentar equipamentos, ou ainda, para gerar energia el?trica. Tais motores baseiam-se no ciclo motor de combust?o Otto, que requer um g?s natural com especifica??o bem definida, conferindo caracter?sticas antidetonantes necess?rias ao desempenho de equipamentos com projetos baseados neste ciclo. Esta tese prop?e a abordagem de aplica??o de duas opera??es simples, ou seja , a absor??o seguida por um flash para regenerar o solvente . Esta abordagem pode ser aplicada em ?reas de produ??o remotas. Com base em simula??es de processo e propriedades f?sico-qu?micas , ?lcool isooct?lico foi selecionado como absorvente para esta an?lise. As medi??es de absor??o de escala de laborat?rio s?o apresentadas usando um g?s natural sint?tico e an?lise de cromatografia em linha. Tamb?m s?o descritos os resultados de c?lculo de dados de equil?brio l?quido-vapor de alcanos e ?lcool atrav?s da equa??o Soave-Redlich-Kwong de estado (EoS) modificada com a fun??o alfa e par?metros da regra de mistura (van der Waals e UNIFAC). Com base nas medi??es e c?lculos EoS foram fornecidas as curvas de opera??o e de equil?brio. Uma s?rie sistem?tica de simula??es de absor??o GN de esp?cies pesadas seguido por um regenerador solvente flash ? apresentada e discutida. Apresenta-se tamb?m um piloto de absor??o de g?s set-up at? 70 bars que ? capaz de avaliar a escala e efeito da press?o. ?, assim, demonstrado tanto experimental e computacionalmente que a abordagem proposta de absor??o de esp?cies C5 + do GN ? simples e vi?vel para especificar o ?ndice de metano do g?s de combust?o para aplica??es remotas.
8

Analýza ferorezonančního přepětí v elektrických sítích / Analysis of Ferroresonance Overvoltage in Electrical Net

Bátora, Branislav January 2014 (has links)
This thesis deals with the ferroresonance phenomenon and ferroresonance overvoltage in electric networks. That’s why the introduction part explains the theoretical basis of ferroresonance and its consequences in the power system. The work then focuses on the power system as a non-linear dynamic system and describes various analytical methods for solving these systems. These methods are further applied to diagnose specific systems. There are a number of various power system configurations susceptible to ferroresonance. The most frequent one is theoretically analyzed in this thesis and a number of recommendations are offered for reducing the ferroresonance phenomenon. The thesis further deals with the selection of suitable software for this computationally chal-lenging task. A number of different tools are considered and efficiently reduced to Matlab Sim-ulink and PSCAD software. Matlab Simulink and its SimPowerSystem Toolbox are used to ana-lyze the effect of hysteresis of the magnetic core of the transformer on the emergence and course of the ferroresonance phenomenon. Using PSCAD, various configurations of the power systems are compared in terms of possible emergence and course of ferroresonance and also to find the limiting conditions that increase the probability of this phenomenon. The possibility of using arti-ficial neural networks for ferroresonance diagnosis is also mentioned in this thesis. The final part provides a number of recommendations for design and operation of both new and existing power systems.
9

Sor??o de CO2 com l?quido i?nico aditivado com extensores de ?rea superficial / Sorption of CO2 with ionic liquid additivated with surface area extenders

Souza, Andr? Luiz Anton de 23 March 2017 (has links)
Submitted by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-06-30T13:47:33Z No. of bitstreams: 1 DIS_ANDRE_LUIZ_ANTON_DE_SOUZA_COMPLETO.pdf: 1015461 bytes, checksum: 70dfda26cefa98999779334ff862f5c0 (MD5) / Made available in DSpace on 2017-06-30T13:47:33Z (GMT). No. of bitstreams: 1 DIS_ANDRE_LUIZ_ANTON_DE_SOUZA_COMPLETO.pdf: 1015461 bytes, checksum: 70dfda26cefa98999779334ff862f5c0 (MD5) Previous issue date: 2017-03-23 / In recent years the scientific community has a growing interest in studying environmentally friendly agents sorption of carbon dioxide to be used in substitution of chemical solvents based on amines. Among the technologies studied for this purpose are those which use Ionic liquids that have the advantage of having very low vapor pressures, higher density than water, a low melting point and a desorption low energy; These qualities that make them environmentally friendly solvents, compared with volatile organic solvents. Moreover ionic liquids are chemically and thermally stable and can be used at relatively high temperatures, its physical-chemical properties can be designed by varying the substitutive groups of the cation or the combined ion. These characteristics make ionic liquids potentially important for the development of new processes focused on the mitigation of global warming. Otherwise the ionic liquids have a high viscosity, they are expensive making them economically unfeasible for use in conventional processes with liquid gas absorption columns. On the other side are available in the market the bubble glass that have several applications in the industry, have low cost, high chemical and physical resistance. This work evaluated in isochoric saturation cell, the carbon dioxide solubility in mixed systems with boron silicate bubble glass, with volumetric concentrations of 5% to 50%, in the ionic liquids [Bmim][BF4] and [mBmim] [NTf2] as well as with pure ionic liquids. Data are reported at 27 Bar pressure and at temperatures 303, 313, and 323 K. Mixed systems with 50% concentration of bubble glass showed the best results of sorption and cost for both ionic liquids. / Nos ?ltimos anos existe na comunidade cient?fica um crescente interesse em estudar agentes de sor??o de di?xido de carbono ambientalmente amig?veis para serem utilizados em substitui??o aos solventes qu?micos baseados em aminas. Entre as tecnologias estudadas para este fim est?o aquelas que utilizam os l?quidos I?nicos (LI). Estes compostos apresentam como caracter?stica diferencial baix?ssima press?o de vapor, densidade maior que a da ?gua, baixo ponto de fus?o e baixa energia de regenera??o; qualidades estas que os tornam solventes ambientalmente amig?veis quando comparados com os solventes org?nicos vol?teis. Por?m a alta viscosidade e custo limitam o uso dos Lis. Estudos realizados com sistemas mistos de LIs e part?culas s?lidas tem mostrado que tais part?culas podem potencializar a a??o dos Lis, assim se identificou as microesferas de vidro, dispon?veis no mercado, onde possuem diversas aplica??es na ind?stria, baixo custo, alta resist?ncia qu?mica e f?sica. Neste trabalho foram avaliados sistemas mistos (Lis + microesferas de vidro boro silicato) visando melhorar as propriedades dos Lis. Para avaliar estes novos sistemas foram obtidos em c?lula de satura??o isoc?rica, dados experimentais de solubilidade do di?xido de carbono, nas concentra??es volum?tricas de 5% a 50%. Foram avaliados os LIs [Bmim] [BF4] e [mBmim] [NTf2] para obter os sistemas mistos, assim como puros. Os dados s?o reportados na press?o de 27 Bar e nas temperaturas 303, 313, e 323 K. Os sistemas mistos com concentra??o de 50% de microesferas apresentaram os melhores resultados combinados de capacidade de sor??o e custo para ambos os l?quidos i?nicos.
10

Caracteriza??o magn?tica e estrutural de filmes depositados por gaiola cat?dica

Ara?jo, Ana Karollina Gomes de 25 July 2014 (has links)
Made available in DSpace on 2014-12-17T15:15:04Z (GMT). No. of bitstreams: 1 AnaKGA_DISSERT.pdf: 1807771 bytes, checksum: 5500fb357c9de3200037867308a2a9b6 (MD5) Previous issue date: 2014-07-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Iron nitrite films, with hundred of nanometers thick, were deposited using the Cathodic cage plasma nitriding method, with a N2/H2 plasma, over a common glass substract. The structure, surface morphology and magnetic properties were investigated using X-ray diffractometry (XRD), atomic force microscopy (AFM) and vibrating sample magnetometer (VSM). XRD shows the formation of γ FeN phase and a combination of ζFe2N + ɛFe3N phases. The film s saturation magnetization and coercivity depends on morphology, composition, grain size and treatment temperature. Temperature raising from 250 ?C to 350 ?C were followed by an increase in saturation magnetization and film s surface coercivity on the parallel direction in relative proportion. This fact can be attributed to the grain sizes and to the different phases formed, since iron rich fases, like the ɛFe3N phase, emerges more frequently on more elevated treatment s temperature. Using this new and reasonably low cost method, it was possible to deposit films with both good adhesion and good magnetic properties, with wide application in magnetic devices / Filmes de nitreto de ferro, com centenas de nanometros de espessura foram depositados pelo m?todo de deposi??o/nitreta??o por Gaiola Cat?dica utilizando um plasma de N2/H2 sobre um substrato de vidro comum. A estrutura, morfologia da superf?cie e propriedades magn?ticas foram investigadas com o uso de Difratometria de Raio-X (DRX), Microscopia de For?a At?mica (MFA) e Magnet?metro de Amostra Vibrante (MAV). A DRX exibe a forma??o da fase γ FeN e mistura de fases ζFe2N + ɛFe3N. A magnetiza??o de satura??o e coercividade dos filmes de nitreto de ferro dependem da morfologia, composi??o, tamanho de gr?o e temperatura de tratamento. Com o aumento da temperatura de 250 para 350 ?C, a magnetiza??o de satura??o e a coercividade na dire??o paralela ? superf?cie dos filmes tamb?m aumentam em propor??o relativa. Isto pode ser atribu?do aos tamanhos de gr?os e ?s diferentes fases formadas, j? que fases ricas em ferro como ɛFe3N surgem com frequ?ncia maior em temperaturas de tratamento mais elevadas. Neste estudo foi poss?vel a deposi??o de filmes de boa ades?o e boas propriedades magn?ticas com grande aplica??o em dispositivos magn?ticos por um m?todo novo e de baixo custo

Page generated in 0.0436 seconds