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repositories = "Sapientia - Universidade do Algarve"
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Found 2,407 documents, displaying page 1 of 241

Antioxidantes em frutos e vegetais

Author(s) : Marcelino, Ana Margarida , Figueira, Ana Cristina Oliveira Lopes
Description :
Repository : Sapientia - Universidade do Algarve
Language(s) : Portuguese

Residence times in a hypersaline lagoon: using salinity as a tracer

Author(s) : Mudge, Stephen , Icely, John , Newton, Alice
Description : Generally the waters of the Ria Formosa Lagoon, Portugal have a short residence time, in the order of 0.5 days (Tett, P., Gilpin, L., Svendsen, H., Erlandsson, C.P., Larsson, U., Kratzer, S., Fouilland, E., Janzen, C., Lee, J., Grenz, C., Newton, A., Ferreira, J.G., Fernandes, T., Scory, S., 2003. E...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Temporal and spatial variation of phytopigments in the Western part of the Ria Formosa lagoon, Southern Portugal

Author(s) : Pereira, M. , Icely, J. , Mudge, S. , Newton, Alice , Rubina, R.
Description : The spatial and temporal variation of phytoplankton pigments in the western part of Ria Formosa, Portugal, was investigated between September 2000 and July 2002. Sampling stations included the ocean boundary (Anc˜ao inlet) and two different landward boundary situations: 1) the shallow westernmost “b...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Land Ocean Interactions in the Coastal Zone, LOICZ: lessons from Banda Aceh, Atlantis, and Canute

Author(s) : Newton, Alice , Icely, John
Description :
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Oxygen depletion in relation to water residence times

Author(s) : Mudge, S. , Icely, J. , Newton, Alice
Description : The relationship between residence time and oxygen saturation was investigated in a mesotidallagoon in southern Portugal. The system receives no significant freshwater input during the summer months and has a high evaporation rate. These features enable an estimate of residence time from the salinit...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Some recent developments on Shannon's General Purpose Analog Computer

Author(s) : Graça, Daniel
Description : This paper revisits one of the rst models of analog computation, the General Purpose Analog Computer (GPAC). In particular, we restrict our attention to the improved model presented in [11] and we show that it can be further re ned. With this we prove the following: (i) the previous model can be si...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Computability in planar dynamical systems

Author(s) : Graça, Daniel , Zhong, Ning
Description : In this paper we explore the problem of computing attractors and their respective basins of attraction for continuous-time planar dynamical systems. We consider C1 systems and show that stability is in general necessary (but may not be sufficient) to attain computability. In particular, we show that...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

The ordinary differential equation defined by a computable function whose maximal interval of existence is non-computable

Author(s) : Graça, Daniel , Zhong, Ning , Buescu, Jorge
Description : Let (®, ¯) ½ R denote the maximal interval of existence of solution for the initial-value problem ½ dx dt = f(t, x), f : E ! Rm,E is an open subset of Rm+1 x(t0) = x0, with (t0, x0) 2 E. We show that (®, ¯) is r.e. (recursively enumerable) open and the solution x(t) defined on (®, ¯) is computable, ...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Analog computers and recursive functions over the reals

Author(s) : Graça, Daniel , Costa, Jose Felix
Description : This paper revisits one of the rst models of analog computation, the General Purpose Analog Computer (GPAC). In particular, we restrict our attention to the improved model presented in [11] and we show that it can be further re ned. With this we prove the following: (i) the previous model can be si...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Robust simulations of Turing machines with analytic maps and flows

Author(s) : Graça, Daniel , Campagnolo, Manuel , Buescu, Jorge
Description : In this paper, we show that closed-form analytic maps and ows can simulate Turing machines in an error-robust manner. The maps and ODEs de ning the ows are explicitly obtained and the simulation is performed in real time.
Repository : Sapientia - Universidade do Algarve
Language(s) : English
1 2 3 4 5 > >>

Found 2,407 documents, displaying page 1 of 241