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repositories = "Sapientia - Universidade do Algarve"
<< < 1 2 3 4 5 > >>

Found 2,407 documents, displaying page 3 of 241

Computability, noncomputability and undecidability of maximal intervals of IVPs

Author(s) : Graça, Daniel , Zhong, Ning , Buescu, Jorge
Description : Let ( ; ) R denote the maximal interval of existence of solution for the initial-value problem dx dt = f(t; x) x(t0) = x0; where E is an open subset of Rm+1, f is continuous in E and (t0; x0) 2 E. We show that, under the natural de nition of computability from the point of view of applications,...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Computing domains of attraction for planar dynamics

Author(s) : Graça, Daniel , Zhong, Ning
Description : In this note we investigate the problem of computing the domain of attraction of a ow on R2 for a given attractor. We consider an operator that takes two inputs, the description of the ow and a cover of the attractors, and outputs the domain of attraction for the given attractor. We show that: (i)...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Parâmetros que condicionam os valores da casualidade sísmica

Author(s) : Estevão, João Manuel Carvalho , Oliveira, Carlos Sousa
Description :
Repository : Sapientia - Universidade do Algarve
Language(s) : Portuguese

Sulfonic-functionalized SBA-15 as an active catalyst for the gas-phase dehydration of glycerol

Author(s) : Lourenço, J. P. , Macedo, Maria I. , Fernandes, Auguste
Description : Sulfonic-functionalized mesoporous silicas (SBA-15) were used as catalysts in the gas-phase dehydration of glycerol at moderate temperature (275 and 300 ºC). For the tested conditions all the samples show a very high catalytic activity. At the lowest temperature and for 140 h on stream a nearly cons...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Response to seasonal drought in three cultivars of Ceratonia siliqua: leaf growth and water relations

Author(s) : Correia, Maria João , Coelho, D. , David, Maria Manuela
Description : The responses of leaf growth and leaf water relations to seasonal drought were monitored, during two successive years, in three cultivars of Ceratonia siliqua L. growing in the field, in the South of Portugal. In leaves from the current year growth bulk leaf water relations parameters were character...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Effects of water deficit on the activity of nitrate reductase and content of sugars, nitrate and free amino acids in the leaves and roots of sunflower and white lupin plants growing under two nutrient supply regimes

Author(s) : Correia, Maria João , Fonseca, Filomena , Azedo-Silva, João , Dias, Celeste , David, Maria Manuela , Barrote, Isabel
Description : The effects of a two weeks soil drying period on the activity of nitrate reductase (NR; EC 1.6.6.6) were studied on Helianthus annuus L. and non-nodulated Lupinus albus L. plants, growing under two nutrient supply regimes. NR activity was assessed in leaf and root extracts, by measuring the activity...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Intermolecular alkyl radical addition to methyl 2-(2,6-Dichlorophenyl)-2H-azirine-3-carboxylate

Author(s) : Lemos, A. , Guimaraes, Emanuel , Fortes, Gil , Alves, Maria José Chão
Description : The 2H-azirine 1 acts as an effective radical acceptor for secondary and tertiary alkyl iodides mediated by triethylborane. The addition proceeds with high regio- and diastereo-selectivity.
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Human-computer interaction: the agency perspective

Author(s) : Zacarias, Marielba , Oliveira, José Valente de
Description : Agent-centric theories, approaches and technologies are contributing to enrich interactions between users and computers. This book aims at highlighting the influence of the agency perspective in Human-Computer Interaction through a careful selection of research contributions. Split into five section...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Collaborative methods for business process discovery

Author(s) : Zacarias, Marielba , Martins, Paula Ventura
Description : Information flows across the organization are complex and procedures employed to understand, share and control organizational knowledge and experiences should be properly supported by collaborative environments. Nevertheless, few collaborative methodologies had been proposed to describe and evolve b...
Repository : Sapientia - Universidade do Algarve
Language(s) : English

Identifying the source of nutrient contamination in a lagoon system

Author(s) : Wayland, D. , Megson, D. , Mudge, S. , Icely, J. , Newton, Alice
Description : Nutrient concentrations within watercourses are often associated with the input of sewage or the runoff of fertilizers. Due to population increases, there has been a dramatic rise in the amount of fertilizer applied to land, as well as in the further development of sewage treatment plants (STPs), bo...
Repository : Sapientia - Universidade do Algarve
Language(s) : English
<< < 1 2 3 4 5 > >>

Found 2,407 documents, displaying page 3 of 241