Mathematical Physics
Mostrando 13-24 de 85 artigos, teses e dissertações.
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13. Reduccionismo Didáctico y Creencias de Profesores acerca del Teorema de Pitágoras
Abstract In this paper, we report the results of an exploratory research in which the interest was to identify how beliefs that support teachers in service about the Pythagorean Theorem are indicators of a didactical reductionism on this mathematical result. Questionnaires were applied to five public high school mathematics teachers and a semi-structured int
Bolema. Publicado em: 2017-12
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14. Electromagnetism as a world view: implications for the teaching of energy
There are considerable differences in the ways mechanics and electromagnetism conceptualize energy. In the former, energy is defined in terms of force and work in a process-like reasoning that remits us to the ”past” of a given body or system. Moreover, in the mechanical framework energy is ascribed to matter, i.e., one speaks of the energy of a system o
Rev. Bras. Ensino Fís.. Publicado em: 22/06/2017
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15. Una demostración simple de la desigualdad de Bell basada en la teoría elemental de conjuntos
Bell's inequality has been considered one of deepest results of science. Due to its importance, several works have attempted to make it accessible to non-specialists. In this article we present a new proof of Bell's inequality based on elementary set theory, which stands out for its mathematical simplicity. The exposition is mainly intended for both graduate
Rev. Bras. Ensino Fís.. Publicado em: 03/06/2016
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16. Dynamic model of large amplitude vibration of a uniform cantilever beam carrying an intermediate lumped mass and rotary inertia
In this paper, a mathematical model of large amplitude vibration of a uniform cantilever beam arising in the structural engineering is proposed. Two efficient and easy mathematical techniques called variational iteration method and He's variational approach are used to solve the governing differential equation of motion. To assess the accuracy of solutions,
Lat. Am. j. solids struct.. Publicado em: 2014-03
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17. Study of nonlinear vibration of Euler-Bernoulli beams by using analytical approximate techniques
In this paper, nonlinear responses of a clamped-clamped buckled beam are investigated. Two efficient and easy mathematical techniques called He's Variational Approach and Laplace Iteration Method are used to solve the governing differential equation of motion. To assess the accuracy of solutions, we compare the results with the Runge-Kutta 4th order. The res
Lat. Am. j. solids struct.. Publicado em: 2014-01
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18. On the status and role of instrumental images in contemporary science: some epistemological issues
The controversy over imageless thought versus picture thinking (especially via mechanical models), with the recent reconsideration of model-based reasoning in the physical sciences is briefly examined. The main focus of the article is on the role of instrumentally elicited images (scopic instruments, cameras, CCDs) in the sciences, especially in the physical
Sci. stud.. Publicado em: 2014
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19. Vórtices em superfícies de curvatura constante / Vortices on surfaces with constant curvature
Nesta dissertação, fazemos uma revisão da literatura existente sobre vórtices em superfícies de curvatura constante, dando especial atenção às questões de integrabilidade e não integrabilidade. Além disso, apresentamos alguns resultados originais sobre o movimento de vórtices no plano hiperbólico que indicam um possível caminho para demonstrar
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/03/2012
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20. Álgebras de Clifford e a fibração de Hopf / Clifford algebras and the Hopf fibration
Spin groups come in many forms in Mathematics and Mathematical Physics, having great importance in the theory of fiber bundles and differential operators defined on them. The concept of spin structure is derived from them, being the basis of all a theory, known as spin geometry. This thesis introduces the first concepts necessary for the study of such groups
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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21. Numerical prediction of bed-load and surface deformation on a granular bed sheared by a turbulent boundary-layer
The entrainment of solid particles by a fluid flow is frequently found in nature and in industry. A better knowledge of this is of importance to understand the physical nature of the phenomenon and to improve industrial processes. Bed-load occurs if the shear stresses exerted by the fluid on the granular bed are bounded to some limits: a mobile granular laye
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-03
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22. Exact travelling wave solutions for some nonlinear (N+1)-dimensional evolution equations
In this paper, we implement the tanh-coth function method to construct the travelling wave solutions for (N + 1)-dimensional nonlinear evolution equations. Four models, namely the (N + 1)-dimensional generalized Boussinesq equation, (N + 1)-dimensional sine-cosine-Gordon equation, (N + 1)-double sinh-Gordon equation and (N + 1)-sinh-cosinh-Gordon equation, a
Comput. Appl. Math.. Publicado em: 2012
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23. Computabilidade e limites da matemática das teorias físicas: aplicações em sistemas elétricos de potência. / Computability and limits of physical theories mathematics: applications in electric power systems.
Apesar dos modelos usados em engenharia serem, em sua maioria, reconhecidamente aproximados, acredita-se que a matemática usada na física e nos próprios modelos é infinitamente precisa e que tais teorias físicas poderiam prever completamente qualquer evento relacionado às variáveis equacionadas. No limite, seria possível prever o estado do universo e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/09/2011
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24. Aplicabilidade e validação do Geant4 para fótons e elétrons em radioterapia / GEANT4 applicability and validation to Photons and Electrons in Radiotherapy
Due to the increasing use of ionizing radiation in medical applications, in recent decades, the simulation codes for radiation interacting with matter, based on Monte Carlo Method, have been constantly adapted to applications in medical physics. TheMonte Carlo method is a statisticalmethod of numerical simulation of problems using essentially a sequence of r
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/06/2011