Elds
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. AplicaÃÃo de princÃpios de qualidade de dados durante o desenvolvimento de um sistema computacional mÃdico para a cirurgia coloproctolÃgica / Application of data quality principles in the development of a computacional medical system for coloproctology surgery
Lately, many human knowledge fields use computer systems to support data management which are the foundation to the decision making process. Data Quality (DQ) is a key feature whose absence can undermine the usefulness of the information and the processes that use it. There can be found in the literature several cases of DQ problems with impact in many
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2012
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2. Cotas para a distância mínima de códigos de Goppa envolvendo o piso e o teto de um divisor
Neste trabalho, estudamos os fundamentos da teoria de corpos de funções algébricas, uma introdução à teoria de códigos, cabendo ressaltar neste ponto o estudo de códigos Geométricos de Goppa juntamente com os conceitos de derivação e forma diferencial, e resultados gerais no que diz respeito ao piso e o teto de um divisor. Este trabalho tem por ob
Publicado em: 2011
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3. Sistemas dinâmicos discretos lineares
This work studies finite dynamical systems. These are deterministic dynamical systems, with discrete time and a finite number of possible states. We focus on linear finite dynamical system (LFDS). This is a rather successful case. It can be reduced to essentially two basic subcases: bijective and nilpotent. The reduction uses tools from linear algebra, mainl
Publicado em: 2010
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4. Geração e proteção de estados comprimidos do campo e estados atômicos emaranhados em cavidades ópticas
In this work we investigated the engineering of interactions and reservoirs in the context of Cavity Quantum Electrodynamics. The investigated system consists of two identical three-level atoms trapped in two distinct traps, but inside the same optical cavity, inte- racting with the cavity mode and driven by classical .elds to manipulate the atom-.eld intera
Publicado em: 2010
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5. Semântica proposicional categórica
The basic concepts of what later became called category theory were introduced in 1945 by Samuel Eilenberg and Saunders Mac Lane. In 1940s, the main applications were originally in the elds of algebraic topology and algebraic abstract. During the 1950s and 1960s, this theory became an important conceptual framework in other many areas of mathematical researc
Publicado em: 2010
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6. Desenvolvimento e aplicações de sensores de campo magnético por indução : [dissertação]
This work addresses the development of magnetic elds meters at low frequencies. The sensing elements used are induction coils and the Chattock-Rogowski coils, both with non-ferromagnetic cores. Theoretical and experimental studies on the working principle of these sensors are presented, considering the practical aspects related to their non-ideal behavior. T
Publicado em: 2009
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7. Banco de filtros e wavelets sobre corpos finitos
Filter banks and wavelets are tools of Engineering, dened over complex elds, with many applications. This dissertation introduces the theory of lter banks and wavelets dened over nite elds, over cyclical and noncyclical structures. The problem of dening two-channel lter banks and wavelet decompositions over elds of characteristic two was solved, thereby prov
Publicado em: 2008
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8. Orbitas periodicas em sistemas mecanicos / Periodic orbits in dynamical systems
In this work we study dynamical systems possessing Hamiltonian and time-reversible structures. The reversibility concept is de¯ned in terms of an involution. Initially we discuss the dynamics of Hamiltonian vector ¯elds with 2 and 3 degrees of freedom around an elliptic equilibrium in the presence of an involution which preserves the symplectic structure.
Publicado em: 2008
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9. Compactificação de Poincaré de Campos polinomiais.
Neste trabalho, apresentamos a Compactificação de Poincaré de campos vetoriais polinomiais e provamos uma série de propriedades dela, principalmente para campos vetoriais hamiltonianos
Publicado em: 2007
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10. Optimization of conductor bunches of transmission line with emphasis in the decrease of electromagnetic impacts / Rearranjo otimizado dos feixes de condutores de linhas de transmissÃo com o foco centrado na minimizaÃÃo de impactos eletromagnÃticos
O presente trabalho aborda o desenvolvimento de novas disposiÃÃes dos condutores de linhas transmissÃo visando a minimizaÃÃo dos campos elÃtricos e magnÃticos produzidos pelas mesmas. Para isso, foram utilizadas as equaÃÃes de campo elÃtrico e magnÃtico formuladas a partir da Lei de Coulomb e Ampere, respectivamente. Os cÃlculos desses campos tiv
Publicado em: 2007
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11. Alloying in GeSi:Si (001) epitaxial nanocrystals / Formação de ligas em nanocristais epitaxiais de GeSi:Si (001)
The structural and electronic properties of nanoscale materials strongly depend on the chemical composition, as well as their size and shape. A big variety of morphologies can be achieved by controlling the experimental conditions during the epitaxial growth of Ge on a Si(001) substrate. In particular, three-dimensional islands with well defined size and sha
Publicado em: 2007
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12. DifusÃo e transporte na presenÃa de macromolÃculas. Imagens e espectroscopia por RMN
The electronic Overhauser effect was employed to enhance nuclear magnetic resonance images obtained in a magnetic eld of only 16 mT. Despite the weak magnetic eld, the technique can reveal, in some systems, various aspects of ionic transport and kinetics apparently not observed in conventional high-eld magnetic resonance imaging. We employed Overhauser imagi
Publicado em: 2004