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Medidas de par?metros morfol?gicos e funcionais do Cora??o em brasileiros: um subestudo do primeiro registro multic?ntricos latino-americano em resson?ncia magn?tica cardi?caMacedo Filho, Robson de 06 May 2013 (has links)
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Previous issue date: 2013-05-06 / Funda??o de Amparo a Pesquisa do Estado de S?o Paulo / There is no data about cardiac measurements em Brazilians obtained by CMR.
This a muldisciplinary study with the objective of obtaining measurements of the
left ventricle (LV) and right ventricle (RV) diastolic diameter (Dd), systolic
diameter (Ds), diastolic volume (Dv), systolic volume (Sv), ejection fraction (EF)
and myocardial mass in Brazilians. One hundred and seven (54 men and 53
women, mean age of 43.4 ? 13.1 years) asymptomatic individuals without heart
disease were submitted to cardiac magnetic resonance (cMR) studies using
steady state free precession technique. The means and standard deviations of
the parameters of the LV and RV were respectively: LVDD = 4,8 ? 0,5 cm;
LVSD = 3,0?0,6 cm; LVDV = 128,4?29,6 ml; LVSV = 45,2?16,6 ml; LVEF =
65,5?6,3%; LV mass = 95,2?30,8.1 g; RVDD = 3,9?1,3 cm; RVSD = 2,5?0,5
cm; RVDV = 126,5?30,7 ml; RVSV = 53.6?18,4 ml; RVEF = 58.3?8,0.0% and
RV mass = 26,1?6,1 g. The masses and volumes were significantly higher in
men, except for the LVSV. The RV EF was significantly higher in women. There
was inverse correlation between RV systolic volume and with age, being more
significant in men. This study describes for the first time benchmarks for cardiac
measurements obtained by CMR among asymptomatic Brazilians individuals
without heart disease and demonstrated differences according to sex and age / N?o h? dados nacionais sobre medidas card?acas obtidas por Resson?ncia
Magn?tica Card?aca (RMc). Esse trabalho multidisciplinar teve como objetivo
obter medidas do di?metro diast?lico (Dd), di?metro sist?lico (Ds), volume
diast?lico final (VdF), volume sist?lico final (VsF), fra??o de eje??o (FE) e da
massa mioc?rdica dos ventr?culos esquerdo (VE) e direito (VD) em brasileiros.
Cento e sete (107) indiv?duos, 54 homens e 53 mulheres, com idade m?dia de
43,4 ? 13,1 anos, assintom?ticos e sem cardiopatias, foram submetidos ? RMc,
utilizando t?cnica de precess?o livre em estado de equil?brio. As m?dias e os
desvios padr?es dos par?metros do VE e VD foram respectivamente: Dd VE =
4,8 ? 0,5 cm; Ds VE = 3,0 ? 0,6 cm; VdF VE = 128,4 ? 29,6 ml; VsF VE = 45,2 ?
16,6 ml; FEVE = 65,5 ? 6,3%; massa do VE = 95,2 ? 30,8 g; Dd VD = 3,9 ? 1,3
cm; Ds VD = 2,5 ? 0,5cm; VdF VD = 126,5 ? 30,7 ml; VsF VD = 53,6 ? 18,4 ml;
FEVD = 58,3 ? 8,0% e massa do VD = 26,1 ? 6,1 g. As massas e volumes
foram significativamente maiores nos homens, exceto para o VsF do VE. A
fra??o de eje??o do VD foi significativamente maior nas mulheres. Houve
correla??o significativa e inversa do Vs do VD com o aumento da idade, sendo
mais significativo nos homens. Esse estudo descreve, pela primeira vez,
medidas card?acas obtidas pela RMc em brasileiros, as quais revelam
diferen?as de acordo com o sexo e a idade
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Desenvolvimento Urbano e Cidades Inclusivas: Estudo Anal?tico do Princ?pio Constitucional da Fun??o Social das CidadesNelson, Aline Virg?nia Medeiros 07 March 2013 (has links)
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Previous issue date: 2013-03-07 / The reality of Latin America points out that the industrialization and urbanization are complementary processes associated each other. Thus, by consequence of the demographic growth, observes the aggravation of an urbanization completely disordered and without infrastructure capable of guaranteeing rights and basic services to the population. In parallel, the dissemination of information, the valorization of human dignity, promoted by social welfare, and expectations of consumption aggravates the tensions among social actors, leading to the Theory of the Right to Development to worry about the (re)construction of cities. Before this reality, the Federal Constitution of 1988 proposed a participatory urban policy, grounded in the ideal of confrontation of social exclusion of a more comprehensive, represented by the principle of the social function of cities, which must be stratified into four inclusion?s central axes, namely: the social in the strict sense, the economic, the cultural and the policy. The Analysis of each of these dimensions, keeping the focus on reality and the Brazilian legal system, composes specific objectives of this work. Thus, through deductive research, with use of technique bibliographical and interdisciplinary, this dissertation aims to make connections between social function and development, proposing an analytical concept for the proposing an analytical concept for the principle of social function of cities, through the study of its basic elements. With this, purports to demonstrate how results, firstly, that the juridical study, to fully understand the process of marginalization, must maintain multidisciplinary perspective, own social sciences. Also aims to demonstrate that the dimensions of inclusion are formed by fundamental rights, individual and collective, of liberties and of social guarantees and that without respect to all of them there is no way to talk about implementation of urban development and nor, consequently, about inclusive cities. At the end, after checking the main legal instruments of urban policy that emphasize the community participation, provided for in the Statute of the Cities, and that potentiate the breakup of the circles of exclusion, the work want contribute to the clarification and the awaken to the importance of a new perspective democratic of development in the country, grounded in the appreciation of the individual for realization of modern management, decentralized and that, therefore, inserts the effective participation of urban communities in the acting of the State / A realidade dos pa?ses da Am?rica Latina aponta que a industrializa??o e a urbaniza??o s?o processos complementares, associados um ao outro. Por consequ?ncia do crescimento demogr?fico, nas ?ltimas d?cadas, observa-se de forma agravada, no Brasil, uma urbaniza??o completamente desordenada e destitu?da de infraestrutura, capaz de garantir direitos e servi?os b?sicos ? popula??o. Paralelamente, a difus?o da informa??o, a valoriza??o da dignidade humana, realizado pelo bem-estar social, e as expectativas de consumo aprofundam as tens?es entre os atores sociais, levando a Teoria do Direito ao Desenvolvimento a preocupar-se com a (re) constru??o de cidades. Perante essa realidade, a Constitui??o Federal de 1988 prop?s uma pol?tica urbana participativa, embasada no ideal de enfrentamento da exclus?o social de uma forma mais ampla, representada pelo princ?pio da fun??o social das cidades, o qual pode ser estratificado em quatro eixos centrais de inclus?o, a saber: a inclus?o social em sentido estrito, a econ?mica, a cultural e a pol?tica. A an?lise de cada uma dessas dimens?es, mantendo-se o enfoque na realidade e no ordenamento jur?dico brasileiro, comp?e os objetivos espec?ficos deste trabalho. Desse modo, por meio da pesquisa dedutiva, com uso de t?cnica bibliogr?fica e interdisciplinar, quer essa disserta??o realizar conex?es entre inclus?o e desenvolvimento, propondo um conceito anal?tico para o princ?pio da fun??o social das cidades, atrav?s do estudo de seus basilares elementos. Com isso, pretende demonstrar como resultados, primeiramente, que o estudo jur?dico, para compreender plenamente o processo de marginaliza??o, precisa manter a perspectiva pluridisciplinar, pr?pria das ci?ncias sociais. Tamb?m se almeja demonstrar que as dimens?es de inclus?o s?o formadas pelos direitos fundamentais, individuais e coletivos, de liberdades e de garantias sociais e que sem respeito a todos eles n?o h? como se falar em concretiza??o do desenvolvimento urbano e nem, por consequ?ncia, sobre cidades inclusivas. Ao final, ap?s verificar os principais instrumentos legais de pol?tica urbana que privilegiam a participa??o da comunidade, previsto no Estatuto das Cidades, e que potencializam o rompimento dos c?rculos de exclus?o, pretende o trabalho contribuir para o esclarecimento e o despertar para import?ncia de uma nova perspectiva democr?tica de desenvolvimento end?geno no pa?s, embasada na valoriza??o do indiv?duo para realiza??o de uma gest?o p?blica moderna, descentralizada e que, portanto, busque a participa??o efetiva das comunidades urbanas na atua??o estatal
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Responsabilidade civil como fun??o social na distribui??o e revenda de combust?vel face ao direito do consumidor e ao meio ambienteFernandes, Cl?dina Maria 26 August 2013 (has links)
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Previous issue date: 2013-08-26 / The civil liability of the distribution and retail fuel stems from the fact business activity developed to be high risk and can be said as risk inherent or latent danger that has predictability and normality characterized by placing the consumer in a position of vulnerability, such as the environment, both public policies defined and constitutional protection. Consumer protection as a fundamental right and the environment as the primacy of social order aims the welfare and social justice, as inserted right to the third dimension, are guarded by the State when it creates operational standards through public policies and indirectly intervenes in the economic order. This intervention is due to consumer protection and the environment are economic order principles, founded on free initiative and free competition, ensuring everyone a dignified existence which underlies the irradiation of fundamental rights in private initiative, before the commercial evaluation, mass consumption, the emergence of new technologies that link consumers to the environment before the protection of life, health and safety and ensuring a better quality of life for present and future generations. To repair this damage and the right to information are provided as fundamental rights that put the person at the epicenter of the relations and collective interest stands out against individual interests that to be done need public-private partnership. In such a way that the used methodology was an analysis of documents correlating them with bibliographic sources whose goals are to recognize the civil responsibility as limit to subjective right, having to develop a social function where guilt and risk grow distant and the damage is configured as a consequence of inherent risk, requiring the State interventional postures in fulfilling its public policy; prevailing in these risky activities the solidarity of those involved in the chain of production and socialization of damage forward those are provided directly of products of hazardous nature that put in a position of vulnerability the environment and the consumer / A responsabilidade civil da distribui??o e revenda de combust?vel decorre do fato da atividade empresarial desenvolvida ser de elevado risco, podendo se dizer como de risco inerente ou periculosidade latente, que tem a previsibilidade e normalidade como caracter?stica, colocando em posi??o de vulnerabilidade o consumidor, como o meio ambiente, ambos com pol?ticas p?blicas definidas e com prote??o constitucional. A prote??o do consumidor como direito fundamental e o meio ambiente como primado da ordem social tem como objetivo o bem-estar e justi?a social, inseridos como direito de terceira dimens?o, s?o resguardados pelo Estado quando cria normas de operacionaliza??o atrav?s das pol?ticas p?blicas e de forma indireta interv?m na ordem econ?mica. Esta interven??o se d? em decorr?ncia da defesa do consumidor e do meio ambiente serem princ?pios da Ordem Econ?mica, fundado na livre iniciativa e na livre concorr?ncia, assegurando a todos uma exist?ncia digna, que fundamenta a irradia??o dos direitos fundamentais na iniciativa privada, diante da evolu??o comercial, do consumo em massa, do surgimento de novas tecnologias que vinculam consumidor ao meio ambiente diante da prote??o ? vida, ? sa?de e seguran?a e garantia de uma melhor qualidade de vida para as presentes e futuras gera??es. Para isto a repara??o do dano, bem como direito ? informa??o s?o previstos como direitos fundamentais, que colocam a pessoa no epicentro das rela??es e o interesse coletivo se sobressaem diante interesses individuais que para serem concretizados necessitam da parceria p?blica privada. De forma que a metodologia usada foi ? an?lise de documentos correlacionando-os com fontes bibliogr?ficas, cujos objetivos ? reconhecer a responsabilidade civil como limite ao direito subjetivo, passando a ter uma fun??o social, onde a culpa e o risco, v?o se distanciando e o dano se configura como consequ?ncia inerente ao risco, exigindo do Estado, posturas interventivas no cumprimento de suas pol?ticas p?blicas; devendo prevalecer nestas atividades de risco ? solidariedade dos envolvidos na cadeia de produ??o e a socializa??o do dano frente aqueles que usufruem diretamente de produtos de natureza perigosa, que colocam em posi??o de vulnerabilidade o meio ambiente e o consumidor
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Fun??o quadr?ticaSoares, Jobson Hugo de Sousa 15 March 2013 (has links)
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Previous issue date: 2013-03-15 / In general, the study of quadratic functions is based on an excessive amount formulas,
all content is approached without justification. Here is the quadratic function and its
properties from problems involving quadratic equations and the technique of completing
the square. Based on the definitions we will show that the graph of the quadratic function
is the parabola and finished our studies finding that several properties of the function can
be read from the simple observation of your chart. Thus, we built the whole matter
justifying each step, abandoning the use of decorated formulas and valuing the reasoning / Em geral, o estudo de fun??es quadr?ticas ? baseado numa quantidade excessiva de f?rmulas, todo conte?do ? abordado sem justificativas. Apresentamos a fun??o quadr?tica e suas propriedades a partir de problemas envolvendo equa??es do segundo grau e
da t?cnica de completar quadrado. Partindo das defini??es mostraremos que o gr?fico da fun??o quadr?tica ? a par?bola e terminamos nosso estudos verificando que v?rias propriedades da fun??o podem ser lidas a partir da simples observa??o do seu gr?fico.
Dessa forma, constru?mos todo o assunto justificando cada passo, abandonando o uso de
f?rmulas decoradas e prezando pelo racioc?nio
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Uma justificava da validade do teorema fundamental da ?lgebra para o ensino m?dioNicacio, Nilson Herminio 14 August 2013 (has links)
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Previous issue date: 2013-08-14 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Among several theorems which are taught in basic education some of them
can be proved in the classroom and others do not, because the degree of
difficulty of its formal proof.
A classic example is the Fundamental Theorem of Algebra which is not
proved, it is necessary higher-level knowledge in mathematics.
In this paper, we justify the validity of this theorem intuitively using the
software Geogebra. And, based on [2] we will present a clear formal proof of
this theorem that is addressed to school teachers and undergraduate students
in mathematics / Dentre os v?rios teoremas que s?o ensinados na educa??o b?sica, alguns podem ser demonstrados em sala de aula e outros n?o, devido o grau de dificuldade de sua prova formal. Um exemplo cl?ssico e o Teorema Fundamental da Alg?bra, que n?o ? demonstrado, pois ? necess?rio conhecimentos em Matem?tica de n?vel superior.
Neste trabalho, justicamos intuitivamente a validade do Teorema Fundamental
da Algebra usando o software Geogebra. E, baseados em [2], apresentamos
uma clara demonstra??o formal desse teorema que est? endere?ada aos
professores do ensino b?sico e alunos de licenciatura em Matem?tica
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An?lise da formula??o em Monte Carlo dos pacotes de energia multiespectrais aplicada a meios constitu?dos por vapor d'?gua / An analysis of the Monte Carlo multi-espectral energy bundles formulation applied to media constituted of water vaporBezerra, Yuri Shalom de Freitas 30 August 2014 (has links)
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Previous issue date: 2014-08-30 / O m?todo de Monte Carlo ? preciso e, quando comparado com outras t?cnicas num?ricas, ? de relativamente f?cil implementa??o para a solu??o de problemas envolvendo geometrias complexas e espalhamento anisotr?pico da radia??o. Al?m disso, diferentemente do que ocorre para a maioria das t?cnicas num?ricas, cujo tempo necess?rio para a execu??o de simula??es tende a crescer exponencialmente ? medida que a complexidade do problema aumenta, no Monte Carlo, o aumento no tempo computacional tende a ser linear. Ainda assim, as solu??es em Monte Carlo s?o computacionalmente pesadas para a solu??o da maioria dos problemas de interesse. O modelo dos Pacotes de Energia Multiespectrais permite a redu??o dos tempos computacionais associados ?s solu??es atrav?s do m?todo de Monte Carlo. O modelo ? aqui analisado para aplica??es em meios constitu?dos por esp?cies n?o-participantes e vapor d??gua, que ? um importante emissor de radia??o formado na combust?o de hidrocarbonetos. Aspectos relacionados ? otimiza??o dos tempos computacionais s?o investigados e solu??es obtidas com o modelo s?o comparadas com solu??es linha-por-linha benchmark. / The Monte Carlo method is accurate and is relatively simple to implement for the
solution of problems involving complex geometries and anisotropic scattering of radiation as
compared with other numerical techniques. In addition, differently of what happens for most
of numerical techniques, for which the associated simulations computational time tends to
increase exponentially with the complexity of the problems, in the Monte Carlo the increase
of the computational time tends to be linear. Nevertheless, the Monte Carlo solution is highly
computer time consuming for most of the interest problems. The Multispectral Energy Bundle
model allows the reduction of the computational time associated to the Monte Carlo solution.
The referred model is here analyzed for applications in media constituted for nonparticipating
species and water vapor, which is an important emitting species formed during
the combustion of hydrocarbon fuels. Aspects related to computer time optimization are
investigated the model solutions are compared with benchmark line-by-line solutions
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Novas abordagens para configura??es autom?ticas dos par?metros de controle em comit?s de classificadoresNascimento, Diego Silveira Costa 05 December 2014 (has links)
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Previous issue date: 2014-12-05 / Significativos avan?os v?m surgindo em pesquisas relacionadas ao tema de Comit?s de Classificadores.
Os modelos que mais recebem aten??o na literatura s?o aqueles de natureza est?tica,
ou tamb?m conhecidos por ensembles. Dos algoritmos que fazem parte dessa classe, destacam-se
os m?todos que utilizam reamostragem dos dados de treinamento: Bagging, Boosting e Multiboosting.
A escolha do tipo de arquitetura e dos componentes a serem recrutados n?o ? uma tarefa
trivial, e tem motivado, ainda mais, o surgimento de novas propostas na tentativa de se construir
tais modelos de forma autom?tica e, muitas delas, s?o baseadas em m?todos de otimiza??o.
Muitas dessas contribui??es n?o t?m apresentado resultados satisfat?rios quando aplicadas a
problemas mais complexos ou de natureza distinta. Em contrapartida, a tese aqui apresentada
prop?e tr?s novas abordagens h?bridas para constru??o autom?tica em ensembles de classificadores:
Incremento de Diversidade, Fun??o de Avalia??o Adaptativa e Meta-aprendizado para a
elabora??o de sistemas de configura??o autom?tica dos par?metros de controle para os modelos
de ensemble. Na primeira abordagem, ? proposta uma solu??o que combina diferentes t?cnicas
de diversidade em um ?nico arcabou?o conceitual, na tentativa de se alcan?ar n?veis mais elevados
de diversidade em ensemble, e com isso, melhor o desempenho de tais sistemas. J? na
segunda abordagem, ? utilizado um algoritmo gen?tico para o design autom?tico de ensembles.
A contribui??o consiste em combinar as t?cnicas de filtro e wrapper de forma adaptativa para
evoluir uma melhor distribui??o do espa?o de atributos a serem apresentados aos componentes
de um ensemble. E por fim, a ?ltima abordagem, que prop?e uma nova t?cnica de recomenda??o
de arquitetura e componentes base em ensemble, via t?cnicas de meta-aprendizado tradicional e
multirr?tulo. De forma geral os resultados s?o animadores, e corroboram com a tese de que ferramentas
h?bridas s?o uma poderosa solu??o na constru??o de ensembles eficazes em problemas
de classifica??o de padr?es / Significant advances have emerged in research related to the topic of Classifier Committees.
The models that receive the most attention in the literature are those of the static nature, also
known as ensembles. The algorithms that are part of this class, we highlight the methods that
using techniques of resampling of the training data: Bagging, Boosting and Multiboosting. The
choice of the architecture and base components to be recruited is not a trivial task and has motivated
new proposals in an attempt to build such models automatically, and many of them are
based on optimization methods. Many of these contributions have not shown satisfactory results
when applied to more complex problems with different nature. In contrast, the thesis presented
here, proposes three new hybrid approaches for automatic construction for ensembles: Increment
of Diversity, Adaptive-fitness Function and Meta-learning for the development of systems
for automatic configuration of parameters for models of ensemble. In the first one approach, we
propose a solution that combines different diversity techniques in a single conceptual framework,
in attempt to achieve higher levels of diversity in ensembles, and with it, the better the performance
of such systems. In the second one approach, using a genetic algorithm for automatic
design of ensembles. The contribution is to combine the techniques of filter and wrapper adaptively
to evolve a better distribution of the feature space to be presented for the components of
ensemble. Finally, the last one approach, which proposes new techniques for recommendation of
architecture and based components on ensemble, by techniques of traditional meta-learning and
multi-label meta-learning. In general, the results are encouraging and corroborate with the thesis
that hybrid tools are a powerful solution in building effective ensembles for pattern classification
problems.
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A rela??o forma e significado em vers?es da B?bliaMagalh?es, Rodrigo Santos 01 April 2015 (has links)
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Previous issue date: 2015-04-01 / Este trabalho analisa textos de duas vers?es distintas da B?blia da vertente protestante, a saber: a Almeida, Revista e Corrigida (ARC) e a Nova Tradu??o na Linguagem de Hoje (NTLH). Nesse sentido, investiga as configura??es lingu?stico-textuais dessas vers?es, com o objetivo de identificar diferen?as consider?veis entre elas e implica??es na atribui??o de sentido de uma e de outra. A B?blia ? um livro com influ?ncia hist?rica e sua import?ncia n?o se limita somente ? esfera religiosa, sendo tamb?m considerada, por muitos, como uma obra de alto valor liter?rio. Ela continua em plena e ampla circula??o no contexto hist?rico-religioso-cultural do mundo de hoje. Al?m disso, esse livro re?ne aspectos discursivos e lingu?stico-textuais importantes a serem investigados, especialmente, se considerado o fato de podermos confrontar suas diferentes tradu??es. Das duas vers?es b?blicas (ARC e NTLH), interessam-nos particularmente tr?s g?neros discursivos distintos (poema, par?bola e ep?stola), sendo cinco textos de cada vers?o, o que resulta num total de dez textos. A esse respeito, consideramos, ainda, as variadas sequ?ncias tipol?gicas envolvidas na organiza??o dos g?neros discursivos selecionados, observando se a predomin?ncia de uma dessas sequ?ncias implica maior ou menor facilidade/dificuldade de compreens?o. Utilizamos, tamb?m, como suporte de an?lise, protocolos de leitura de informantes diversificados, levando em considera??o o credo religioso, o grau de escolaridade e a faixa et?ria, a fim de verificar se as diferen?as formais dos textos escolhidos e o perfil social dos leitores motivam poss?veis altera??es no processo de compreens?o textual. Para a realiza??o da an?lise, tomamos como suporte te?rico-metodol?gico a Lingu?stica Funcional Centrada no Uso (ou Lingu?stica Cognitivo-Funcional), a qual aglutina contribui??es da tradi??o funcionalista norte-americana e da Lingu?stica Cognitiva. / This paper analyses the texts of two distinct versions of the protestant Bible, namely:
Almeida, Revista e Corrigida (ARC) and Nova Tradu??o na Linguagem de Hoje
(NTLH). In this sense, it investigates the linguistic-textual configurations of such
versions with the aim of identifying relevant differences between them and the
implications for attribution of meaning between the first and the latter. The Bible is a
book of historic influence and its importance is not limited only to the religious realm,
but is also considered by many as a work of high literary value. It currently remains in
full and wide circulation in the historic, religious and cultural contexts. Furthermore, this
book gathers important discursive and textual-linguistic aspects worthy of investigation,
especially, if the fact of contrasting its different versions is considered. From the two
biblical versions (ARC and NTLH), three distinct discursive genres are of interest (poem,
parable and epistle), with five texts from each version, resulting in a total of ten texts. In
this sense, we are also interested in the various typological sequences involved in the
organization of the discursive genres selected, observing if the predominance of such
sequences implies in greater or lesser facility/difficulty of comprehension. We also
utilized as a support for analysis the reading protocols of diverse informants, taking into
consideration the religious beliefs, the level of education and age, with an aim to verify if
the formal differences of the selected texts and the social profile of readers could cause
possible changes to the process of text comprehension. To carry out the analysis, we used
Usage-Based Linguistics (or Cognitive-Functional Linguistics) as a theoreticalmethodological
support, which encompasses contributions from the North American
functional tradition and cognitive linguistics.
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M?todo h?brido para projeto de superf?cies seletivas em frequ?nciaAra?jo, Gilmara Linhares de 10 December 2015 (has links)
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Previous issue date: 2015-12-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Esse trabalho apresenta uma t?cnica h?brida de projeto de superf?cies seletivas em frequ?ncia, sobre uma camada diel?trica isotr?pica, considerando diversas geometrias para os elementos das c?lulas unit?rias. Especificamente, a t?cnica h?brida usa o m?todo do circuito equivalente em conjunto com algoritmos gen?ticos, visando a s?ntese de estruturas com resposta singleband e dual-band. O m?todo do circuito equivalente permite modelar a estrutura por meio de um circuito equivalente e tamb?m a obten??o de circuitos para diferentes geometrias. A partir da obten??o dos par?metros desses circuitos, podem-se obter as caracter?sticas de transmiss?o e de reflex?o das estruturas modeladas. Para obter a otimiza??o das estruturas modeladas, de acordo com a resposta em frequ?ncia desejada, a ferramenta de otimiza??o do Matlab optimtool mostrou-se de f?cil utiliza??o, permitindo explorar resultados importantes na an?lise de otimiza??o. No trabalho, s?o apresentados resultados num?ricos e experimentais para as caracter?sticas de transmiss?o de diferentes geometrias analisadas. Foram efetuadas compara??es com resultados apresentados na literatura, tendo-se observado uma boaconcord?ncia nos casos analisados para estruturas com substratos isotr?picos. / This thesis presents a hybrid technique of frequency selective surfaces project
(FSS) on a isotropic dielectric layer, considering various geometries for the elements of
the unit cell. Specifically, the hybrid technique uses the equivalent circuit method in
conjunction with genetic algorithm, aiming at the synthesis of structures with response
single-band and dual-band. The equivalent circuit method allows you to model the
structure by using an equivalent circuit and also obtaining circuits for different
geometries. From the obtaining of the parameters of these circuits, you can get the
transmission and reflection characteristics of patterned structures. For the optimization
of patterned structures, according to the desired frequency response, Matlab?
optimization tool named optimtool proved to be easy to use, allowing you to explore
important results on the optimization analysis. In this thesis, numeric and experimental
results are presented for the different characteristics of the analyzed geometries. For
this, it was determined a technique to obtain the parameter N, which is based on genetic
algorithms and differential geometry, to obtain the algebraic rational models that
determine values of N more accurate, facilitating new projects of FSS with these
geometries. The optimal results of N are grouped according to the occupancy factor of
the cell and the thickness of the dielectric, for modeling of the structures by means of
rational algebraic equations. Furthermore, for the proposed hybrid model was developed
a fitness function for the purpose of calculating the error occurred in the definitions of
FSS bandwidths with transmission features single band and dual band. This thesis deals
with the construction of prototypes of FSS with frequency settings and band widths
obtained with the use of this function. The FSS were initially reviewed through
simulations performed with the commercial software Ansoft Designer ?, followed by
simulation with the equivalent circuit method for obtaining a value of N in order to
converge the resonance frequency and the bandwidth of the FSS analyzed, then the
results obtained were compared. The methodology applied is validated with the
construction and measurement of prototypes with different geometries of the cells of the
arrays of FSS.
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Desenvolvimento de antenas de microfita com aberturas nos patches condutores atrav?s do m?todo da segmenta??oBraga, Paulo Farias 25 August 2005 (has links)
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Previous issue date: 2005-08-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Microstrip antennas are widely used in modern telecommunication systems. This is particularly due to the great variety of geometries and because they are easily built and integrated to other high frequency devices and circuits. This work presents a study of the properties of the microstrip antenna with an aperture impressed in the conducting patch. Besides, the analysis is performed for isotropic and anisotropic dielectric substrates. The Multiport Network Model MNM is used in combination with the Segmentation Method and the Greens function technique in the analysis of the considered microstrip antenna geometries. The numerical analysis is performed by using the boundary value problem solution, by considering separately the impedance matrix of the structure segments. The analysis for the complete structure is implemented by choosing properly the number and location of the neighboor element ports. The numerial analysis is performed for the following antenna geometries: resonant cavity, microstrip rectangular patch antenna, and microstrip rectangular patch antenna with aperture. The analysis is firstly developed for microstrip antennas on isotropic substrates, and then extended to the case of microstrip antennas on anisotropic substrates by using a Mapping Method. The experimental work is described and related to the development of several prototypes of rectangular microstrip patch antennas wtih and without rectangular apertures. A good agreement was observed between the simulated and measured results. Thereafter, a good agreement was also observed between the results of this work and those shown in literature for microstrip antennas on isotropic substrates. Furthermore, results are proposed for rectangular microstrip patch antennas wtih rectangular apertures in the conducting patch / As antenas de microfita s?o estruturas muito utilizadas nos sistemas de telecomunica??es atuais. Isto decorre, principalmente, da diversidade de configura??es e da facilidade de constru??o e integra??o dessas antenas com outros dispositivos e circuitos de altas freq??ncias. Neste trabalho, o m?todo de an?lise empregado ? o Modelo de Circuito de M?lti-Porta (Multiport Network Model MNM), que combinado com o M?todo da Segmenta??o e a t?cnica da Fun??o de Green, mostra-se adequado ao estudo da antena de microfita com abertura no patch condutor. A partir do equacionamento do problema do valor de contorno, ? ent?o realizada uma an?lise num?rica que consiste em avaliar a estrutura da antena considerada a partir da integra??o dos elementos em que ela foi dividida. Nessa an?lise, os elementos s?o representados por matrizes de imped?ncia e a integra??o ? implementada atrav?s de portas de circuitos adequadamente escolhidas em n?mero e posicionamento. Na an?lise num?rica, foram consideradas as seguintes estruturas: a cavidade ressonante, a microfita com patch retangular convencional (sem abertura) e a microfita com patch retangular com abertura. A an?lise foi efetuada para substratos isotr?picos e estendida para o caso de antenas com substratos anisotr?picos uniaxiais atrav?s do M?todo do Mapeamento. S?o apresentados resultados para a freq??ncia de resson?ncia e para a imped?ncia de entrada de antenas de microfita. A parte experimental do trabalho consistiu no projeto, constru??o e medi??o de v?rios prot?tipos de antenas de microfita com patches retangulares com e sem abertura. Observou-se que os resultados obtidos, atrav?s da simula??o num?rica, apresentaram uma boa concord?ncia com os das medi??es efetuadas. Os resultados deste trabalho, tamb?m, concordaram com os resultados de outros autores, dispon?veis na literatura
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