Algebraic Solutions
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. Soluções analíticas da equação de Burgers aplicada à formação de estruturas no Universo
The Burgers equation has been applied to several fields of scientific knowledge, and particularly to the study of formation of structures in Universe. His relevancestillincreases, duetothewealthofobservationaldatainmodernliterature. His most general form is the generalized Burgers equation with noise as proposed for Ribeiro and Peixoto de Faria [24]. The kno
Publicado em: 2008
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14. Stabilization of a locally damped thermoelastic system
We show that the solutions of a thermoelastic system with a localized nonlinear distributed damping decay locally with an algebraic rate to zero, that is, given an arbitrary R > 0, the total energy E(t) satisfies for t > 0: E(t) < C (1 + t)-γ for regular initial data such that E(0) < R, where C and γ are positive constants. In the two-dimensional case, we
Computational & Applied Mathematics. Publicado em: 2008
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15. Equações diofantinas lineares: um desafio motivador para alunos do ensino médio
This work presents a qualitative study guided by the question Is it possible High School students to make explicit knowledge on linear diofantine equations? , whose relevance is justified from researches as met in Lopes Junior (2005), revealing that High School students do not distinguish and they do not understand when the variable assumes discrete or conti
Publicado em: 2008
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16. A subdivision algorithm for phase equilibrium calculations at high pressures
Phase equilibrium calculations at high pressures have been a continuous challenge for scientists and engineers. Traditionally, this task has been performed by solving a system of nonlinear algebraic equations originating from isofugacity equations. The reliability and accuracy of the solutions are strongly dependent on the initial guess, especially due to th
Brazilian Journal of Chemical Engineering. Publicado em: 2007-12
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17. Applied nonlinear dynamics of non-smooth mechanical systems
This paper introduces practically important concept of local non-smoothness where any dynamical system can be considered as smooth in a finite size subspace of global hyperspaceomega. Global solution is generated by matching local solutions obtained by standard methods. If the dynamical system is linear in all subspaces then an implicit global analytical sol
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12
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18. Decoupling geometry and numerical integration of differential equations implicit nonlinear systems. / Geometria do desacoplamento e integração numérica de equações diferenciais não lineares implícitas.
Classical methods for numerical integration of diferential algebraic equations (DAEs) can be formal in the literature. In this work, using a diferential geometric approach, a numerical method of integration of DAEs is established. This method is inspired in the decoupling theory of nonlinear explicit systems, when one considers that the outputs are algebraic
Publicado em: 2006
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19. Desenvolvimento e implementação do método difusional bidimensional transiente para solução numérica de problemas convectivos difusivos
The study of groundwater contamination involves understanding the relevant mechanisms involved in the migration of pollutants (transport problems). Such problems are governed by convection-diffusion equations whose numerical solutions can be obtained through discrete techniques, when the problem is dominated by diffusion. However, when such problems are domi
Publicado em: 2006
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20. Sobre o numero de soluções de equações polinomiais em corpos finitos / On the number of solutions of polynomial equations on finite fields
O objetivo principal deste trabalho é o estudo do número de soluções de equações polinomiais definidas sobre corpos finitos. Para isto utilizamos resultados básicos sobre a soma de Caracteres e resultados sobre o número de soluções de uma Forma Quadrática. Na nossa abordagem procuramos utilizar técnicas bem elementares, apesar disto implicar num
Publicado em: 2005
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21. O conceito de grupo: sua formação por alunos de matemática / The group concept: their formed by the students of the Mathematics
This work has the obective to anlyse the group concept formed by the students of the Mathematics Course at the Federal University of Campina Grande Campina Grande Campus, as a result of their first course in abstract algebra taken in the second semester of 2002. Throughout this analysis I have tried to understand the concept of a binary operation in a set, f
Publicado em: 2005
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22. Otimização para o posicionamento dos equipamentos do circuito de massa na fabricação de papel Tissue
The main area of an industrial layout is without no doubt the company, defining and integrating the productive elements. The main question is related to the right the place and arrangement of departments, cells or machines in a plant or clerical soil. Because of the geometrical and combinatorid aspects of the problem, it is a kind of question that solution c
Publicado em: 2004
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23. Reconstrução tomográfica de imagens utilizando técnicas POCS seqüenciais e paralelas.
In this dissertation four algorithms are presented for the tomographic reconstruction of images using methods denominated POCS - Projections onto Convex Sets, which are the ART - Algebraic Reconstruction Technique, the SIRT - Simultaneous Iterative Reconstructive Technique, the sequencial POCS and parallel POCS. A comparison is made between the reconstructio
Publicado em: 2001
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24. Solução de problemas : habilidades matematicas, flexibilidade de pensamento e criatividade
This current research had a major main to investigate the existing relations between the thought flexibility and the creativity, shown during the procedures of problems solution, having as subjects 307 6 , 7 and 8" grades students of a municipal public school in the region of Campinas, Sao Paulo. These subjects answered a questionnaire for their characteriza
Publicado em: 2001