Estrutura da Pastagem e Produtividade de Forragem.

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Área Foliar e Produtividade de Forragem.

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Produção de Forragem e Interceptação de Luz.

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Manejo da pastagem e rendimento potencial do azevém (lolium multiflorum lam.).

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Fatores Abióticos e Rendimento Potencial do Azevém (Lolium multiflorum Lam.).

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State of the Art on Small-Scale Concentrated Solar Power Plants☆

AbstractMany efforts have been spent in the design and development of Concentrated Solar Power (CSP) Plants worldwide. Most of them are for on-grid electricity generation and they are medium or large plants (in the order of MWs) which can benefit from the economies of scale.Nevertheless, several potential applications for Small-Scale CSP plants (< 1 MW) can be relevant in the industrial sector as well as for off-grid purposes (i.e. in rural contexts).This paper presents the technologies suitable for off-grid applications, for electricity or cogenerated production. Major characteristics are illustrated and advantages and drawbacks for each configuration identified and discussed

DBI Galileon and Late time acceleration of the universe

We consider 1+3 dimensional maximally symmetric Minkowski brane embedded in a 1+4 dimensional maximally symmetric Minkowski background. The resulting 1+3 dimensional effective field theory is of DBI (Dirac-Born-Infeld) Galileon type. We use this model to study the late time acceleration of the universe. We study the deviation of the model from the concordance \Lambda CDM behaviour. Finally we put constraints on the model parameters using various observational data.Comment: 16 pages, 7 eps figures, Latex Style, new references added, corrected missing reference

Fibra em Gramíneas Forrageiras Tropicais.

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From cosmic deceleration to acceleration: new constraints from SN Ia and BAO/CMB

We use type Ia supernovae (SN Ia) data in combination with recent baryonic acoustic oscillations (BAO) and cosmic microwave background (CMB) observations to constrain a kink-like parametrization of the deceleration parameter ($q$). This $q$-parametrization can be written in terms of the initial ($q_i$) and present ($q_0$) values of the deceleration parameter, the redshift of the cosmic transition from deceleration to acceleration ($z_t$) and the redshift width of such transition ($\tau$). By assuming a flat space geometry, $q_i=1/2$ and adopting a likelihood approach to deal with the SN Ia data we obtain, at the 68% confidence level (C.L.), that: $z_t=0.56^{+0.13}_{-0.10}$, $\tau=0.47^{+0.16}_{-0.20}$ and $q_0=-0.31^{+0.11}_{-0.11}$ when we combine BAO/CMB observations with SN Ia data processed with the MLCS2k2 light-curve fitter. When in this combination we use the SALT2 fitter we get instead, at the same C.L.: $z_t=0.64^{+0.13}_{-0.07}$, $\tau=0.36^{+0.11}_{-0.17}$ and $q_0=-0.53^{+0.17}_{-0.13}$. Our results indicate, with a quite general and model independent approach, that MLCS2k2 favors Dvali-Gabadadze-Porrati-like cosmological models, while SALT2 favors $\Lambda$CDM-like ones. Progress in determining the transition redshift and/or the present value of the deceleration parameter depends crucially on solving the issue of the difference obtained when using these two light-curve fitters.Comment: 25 pages, 9 figure