Global Bifurcation
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Existência e multiplicidade de soluções de problemas de contorno elípticos de quarta ordem via métodos topológicos / Existence and multiplicity of solutions to elliptic boundary value problems by topological methods
Neste trabalho, utilizamos métodos topológicos para estudar existência e multiplicidade de soluções de Problemas de Contorno Elípticos Não Lineares de 4a ordem. Mais precisamente, utilizamos resultados sobre componentes conexas de pontos fixos e tambem bifurcação global, para provar existência e multiplicidade de soluções fracas de Equações Dif
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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2. Existência e multiplicidade de soluções de problemas de contorno elípticos de quarta ordem via métodos topológicos / Existence and multiplicity of solutions to elliptic boundary value problems by topological methods
Neste trabalho, utilizamos métodos topológicos para estudar existência e multiplicidade de soluções de Problemas de Contorno Elípticos Não Lineares de 4a ordem. Mais precisamente, utilizamos resultados sobre componentes conexas de pontos fixos e tambem bifurcação global, para provar existência e multiplicidade de soluções fracas de Equações Dif
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012
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3. Variedades com curvatura prescrita : resultados de existÃncia, unicidade, rigidez e bifurcaÃÃo / Manifolds with prescribe curvature: results of existence uniqueness, rigidity and bifurcation
We present several results of existence, uniqueness, rigidity and bifurcation for the problem of prescribing various geometric structures on Riemannian manifolds, among which include: i) deformation and rigidity for 2k-Einstein structures on manifolds with constant (2k − 2)-sectional curvature; ii) conformal deformation of metrics in the context of the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/02/2012
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4. Robustness margins for indirect field-oriented control of induction motors
The influence of the rotor time constant mismatch on the stability of induction motors under indirect field-oriented control is analyzed. The results of [14] are generalized. A Lyapunov function which provides a global stability test and allows us to compute robustness margins is given. Different mechanisms for the loss of stability are detected by means of
Publicado em: 2011
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5. Estabilidade de equilíbrio e órbitas periódicas em um sistema Lotka-Volterra com duas presas e um predador
In this work we analyzed the Lotka-Volterra system of diferential equations with two preys and a predator, with and without harvesting. Initially we studied the local and global stability of the points of equilibrium in the first model. Later, in the second model, we studied the coefficient of stability of the periodic orbits, by using normal form and numeri
Publicado em: 2008
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6. 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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7. INESTABILIDAD DE ARCOS SEGMENTADOS DE CONCRETO ARMADO / INSTABILIDADE DE ARCOS SEGMENTADOS DE CONCRETO ARMADO / INSTABILITY OF SEGMENTAL REINFORCED CONCRETE ARCHS
Segmental arch is a structure made of several straight segments of precast concrete connected at points belonging to a curve in the form of an arch which circumscribes the structure. This type of arch has some advantages for the precasting industry: a) it allows the use of the same forms used to cast other types of straight pieces such as beams and columns;
Publicado em: 1997
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8. Diversity and virulence thresholds in AIDS.
We propose a model for the interaction between human immunodeficiency virus and the immune system. Two differential equations describe the interactions between one strain of virus and one clone of T lymphocytes. We use the model to generalize earlier results pertaining to the AIDS diversity threshold [Nowak, M. A., Anderson, R. M., McLean, A. R., Wolfs, T. F
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9. Human myoglobin recognition of oxygen: Dynamics of the energy landscape
Femtosecond to nanosecond dynamics of O2 rebinding to human WT myoglobin and its mutants, V68F and I107F, have been studied by using transient absorption. The results are compared with NO rebinding. Even though the immediate environment around the heme binding site is changed by the mutations, the picosecond geminate rebinding of oxygen is at most minimally
National Academy of Sciences.
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10. Spatiotemporal intracellular calcium dynamics during cardiac alternans
Cellular calcium transient alternans are beat-to-beat alternations in the peak cytosolic calcium concentration exhibited by cardiac cells during rapid electrical stimulation or under pathological conditions. Calcium transient alternans promote action potential duration alternans, which have been linked to the onset of life-threatening ventricular arrhythmias
American Institute of Physics.
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11. Public-sector Maternal Health Programmes and Services for Rural Bangladesh
Achieving Millennium Development Goal 5 in Bangladesh calls for an appreciation of the evolution of maternal healthcare within the national health system to date plus a projection of future needs. This paper assesses the development of maternal health services and policies by reviewing policy and strategy documents since the independence in 1971, with primar
International Centre for Diarrhoeal Disease Research.