Couplings
Mostrando 13-24 de 168 artigos, teses e dissertações.
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13. Ajuste de parâmetros para desalinhamento e empenamento aplicado à modelagem de rotores / Identification of misalignment and bow parameters in rotating machinery models
O estudo de máquinas rotativas ocupa uma posição destacada no contexto de máquinas e estruturas devido à quantidade significativa de fenômenos que podem ocorrer durante a operação desses equipamentos. Este trabalho é focado no estudo de sistemas rotativos sustentados por mancais hidrodinâmicos (com ou sem um acoplamento conectando o eixo movido ao
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2010
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14. Experimental and theoretical study of a telemetric dynamic torque meter
This paper presents the development of a dynamic torque meter to be applied to rotating shafts using electronic transduction, strain gage, telemetry and LabView Graphic programming. A mathematical model was developed. The electronic transduction signal is transmitted by digital modulation from a remote transduction unit fixed to a shaft to a base station, se
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-09
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15. Dinâmica simbiótica: o problema estratégico visto sob a perspectiva da complexidade / Symbiotic dynamic: strategic problem seen from complexity perspective
O cenário de grandes transformações do mundo atual fez com que autores consagrados como C. K. Prahalad, Gary Hamel e Peter F. Drucker reconhecessem que os modelos estratégicos vigentes estariam encontrando dificuldades para oferecer racionalidades adequadas para se lidar com o problema da mudança nas sociedades e nas organizações de produção contemp
Publicado em: 2010
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16. A policontexturalidade da Lex Mercatoria: contingência, paradoxo e decisão
The lex mercatoria is part of a global legal pluralism which reemerges with globalization and consolidation of world differentiated society. Through the autopoietic social systems theory is carried out a construction of a new meaning to the lex mercatoria. This construction is based on a systemic architecture that requires three key issues: contingency, para
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2009
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17. Determination and analysis of nJch (n=2,3,4) coupling constants in norbornane derivatives / Determinação e analise das constantes de acoplamento nJch (n=2,3,4) em derivados do norbornano
In the introduction, it is presented a discussion about the effect of hyperconjugative interactions on coupling constants and a discussion about some methodologies for the measurement of long range heteronuclear coupling constants. The reader is introduced to the topics which are the basis of this thesis. Then it is presented the results of the measurement o
Publicado em: 2009
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18. ANALISE DA DINAMICA DE PARTICULAS BROWNIANAS INTERAGENTES A PARTIR DE REDES DE MAPAS ACOPLADOS
The Brownian motion is one important topic of the non-equilibrium statistical mechanics and it is related to many natural phenomena. The first observations and theories on this motion were essential for understand the microscopic behavior of the nature and its influence on macroscopics observables. In this dissertation, we studied the dynamics of a system co
Publicado em: 2009
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19. Simulador de meios porosos saturados elastoplasticos / Numerical simulator of saturated elastoplastic porous media
The exploration of mineral resources is growing in importance in the Brazilian economy. Since the environments in which these resources are found are becoming increasingly more complex and challenging for the production phase, currently unavailable knowledge and technologies are required to produce these reserves. In the particular well drilling and completi
Publicado em: 2009
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20. Simulações numéricas de Monte Carlo aplicadas no estudo das transições de fase do modelo de Ising dipolar bidimensional / Numerical Monte Carlo simulations applied to study of phase transitions in two-dimensional dipolar Ising model
Two-dimensional spin model with nearest-neighbor ferromagnetic interaction and long-range dipolar interactions exhibit a rich phase diagram, whose characteristics have been exploited by several studies in the recent literature. Furthermore, the possibility of explain observed phenomena in ultrathin magnetic films, which have many technological applications,
Publicado em: 2009
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21. Electron paramagnetic resonance studies at X- and Q- bands of the dinuclear compounds Cu2(TzTs)4 and [Cu(flu)2DMF]2 / Estudo através da técnica de ressonância paramagnética eletrônica, em bandas X e Q, dos compostos dinucleares Cu2(TzTs)4 e [Cu(flu)2DMF]2
Esta tese relata um estudo pormenorizado, efetuado através da técnica de Ressonância Paramagnética Eletrônica (RPE) em bandas X (~ 9.5 GHz) e Q (~ 34.5 GHz), de amostras nas formas cristalina e pulverizada dos compostos dinucleares Cu2(TzTs)4, C40H36Cu2N8O8S8, e [Cu(flu)2DMF]2, C62H50Cu2F12N6O10. Tratamentos meticulosos dos espectros de RPE pertinentes
Publicado em: 2009
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22. Analytic QCD: a short review
Analytic versions of QCD are those whose coupling αs(Q²) does not have the unphysical Landau singularities on the space-like axis (-q²= Q² > 0). The coupling is analytic in the entire complex plane except the time-like axis (Q² < 0). Such couplings are thus suitable for application of perturbative methods down to energies of order GeV. We present a shor
Brazilian Journal of Physics. Publicado em: 2008-09
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23. Parametric resonance in dissipative field dynamics
The effects of bosonic trilinear interactions are investigated in the process of resonant particle production. We study a generic model of three fields with trilinear couplings. In this model a scalar field Φ can excite a heavy bosonic field χ which then decays into a light bosonic field σ. We study the consequences of dissipation and stochastic noise ter
Brazilian Journal of Physics. Publicado em: 2008-09
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24. Quantum percolation of one-electron states in power-law diluted chains
We investigate the nature of one-electron eigenstates in power-law diluted chains for which the probability of occurrence of a bond between sites separated by a distance r decays as p(r) = 1/r1+sigma. Using an exact diagonalization scheme on finite chains, we compute the spreading of an initially localized wave-packet, the time dependent participation number
Brazilian Journal of Physics. Publicado em: 2008-03