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- P. Chambel-Leitão, F. Braunschweig, L. Fernandes, R. Neves, P. Galvão, Manuel da Maia
- 2007

MOHID Water Modelling System is an integrated state of the art modular system, composed by a series of models that simulate surface water bodies, streams and watersheds. MOHID’s code development follows a methodology which improves its robustness related to programming errors. MOHID is written in ANSI FORTRAN 95, profiting from all its new features,… (More)

- M. J. F. Maia, M. D. Maia
- Journal of Documentation
- 1984

- M. D. Maia
- 2004

The earliest known publication on Einstein’s Relativity in Brazil is the little book by Amoroso Costa back in 1922 [1]. After that, a more technical book by Pedro Rache appeared only in 1932 [2]. Research papers properly may be tracked back to the early forties, with the collaboration between Mario Schönberg and Chandrashekar in Chicago [3]. Regular and… (More)

- M. D. Maia
- 2008

The cosmological constant problem is examined under the assumption that the extrinsic curvature of the space-time contributes to the vacuum. A compensation mechanism based on a variable cosmological term is proposed. Under a suitable hypothesis on the behavior of the extrinsic curvature, we find that an initially large Λ(t) rolls down rapidly to zero during… (More)

- M D Maia
- 2007

It is shown that a space-time hypersurface of a 5-dimensional Ricci flat spacetime has its energy-momentum tensor algebraically related to its extrinsic curvature and to the Riemann curvature of the embedding space. It is also seen that the Einstein-Maxwell field does not arise naturally from this geometry, so that a Kaluza-Klein model based on it would… (More)

- M. D. Maia, Nildsen Silva
- 2008

The Arnowitt-Deser-Misner canonical formulation of general relativity is extended to the covariant brane-world theory in arbitrary dimensions. The exclusive probing of the extra dimensions makes a substantial difference, allowing for the construction of a non-constrained canonical theory. The quantum states of the brane-world geometry are defined by the… (More)

- M. D. Maia
- 2008

The Friedmann equation for a FRW-brane-world in a flat bulk is derived and applied to the accelerated expansion of the universe. 1 Brane-Worlds It has been recently noted that the predicted scale of 10 TeV for quantum gravity is only a conjecture without experimental support, and that the only experimentally verified scale of gauge interactions in four… (More)

- M D Maia
- 2008

The cosmological constant problem is seen as a symptom of the ambiguity of the Riemann curvature in general relativity. The solution of that ambiguity provided by Nash’s theorem on gravitational perturbations along extra dimensions eliminate the direct comparison between the vacuum energy density and Einstein’s cosmological constant, besides being… (More)

- M. D. Maia
- 2008

The compatibility between general relativity and the property that spacetimes are ebeddable manifolds is further examined. It is shown that the signature of the embedding space is uniquely determined provided the embedding space is real and its dimension is kept to the minimal. Signature changes produce complex embeddings which in turn may induce… (More)

- FERMIONIC MASSES, IN KALUZA-KLEIN, M. D. MAIA
- 1985

Kaluza-Klein relativity is an exotic version of Kaluza-Klein theory in which the four dimensional space-times are submanifolds embedded in the high dimensional space. Dimensional reduction is obtained by reversing the embedding procedure. That is, given a space with dimension D > 4, find the largest dimension and geometries of its submanifolds obeying a… (More)