Cultivo da soca de arroz irrigado: uma alternativa para o aumento da rentabilidade da rizicultura do baixo São Francisco.

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Constraining the evolution of the CMB temperature with SZ measurements from Planck data

The CMB temperature-redshift relation, T_CMB(z)=T_0(1+z), is a key prediction of the standard cosmology, but is violated in many non standard models. Constraining possible deviations to this law is an effective way to test the LambdaCDM paradigm and to search for hints of new physics. We have determined T_CMB(z), with a precision up to 3%, for a subsample (104 clusters) of the Planck SZ cluster catalog, at redshift in the range 0.01-- 0.94, using measurements of the spectrum of the Sunyaev Zel'dovich effect obtained from Planck temperature maps at frequencies from 70 to 353 GHz. The method adopted to provide individual determinations of T_CMB(z) at cluster redshift relies on the use of SZ intensity change, Delta I_SZ(nu), at different frequencies, and on a Monte-Carlo Markov Chain approach. By applying this method to the sample of 104 clusters, we limit possible deviations of the form T_CMB(z)=T_0(1+z)^(1-beta) to be beta= 0.022 +/- 0.018, at 1 sigma uncertainty, consistent with the prediction of the standard model. Combining these measurements with previously published results we get beta=0.016+/-0.012.Comment: submitted to JCAP, 21 pages, 8 figure

Características morfogênicas e estruturais de Brachiaria ruziziensis submetida a níveis de sombreamento.

o objetivo desse trabalho foi determinar e avaliar as características morfogênicas e estruturais da B. ruziziensis submetida a diferentes níveis de sombreamento

Carcinofauna e ictiofauna associadas a vegetação aquática em uma área inundável, Macapá ? AP.

Resumo simples

Ponto de colheita e qualidade da uva BRS Isis sob armazenamento refrigerado seguido de temperatura ambiente.

Esse trabalho teve o objetivo de avaliar o ponto de colheita e a qualidade das uvas da cultivar BRS Ísis quando armazenadas sob refrigeração seguida de temperatura ambiente

Avaliação física, morfológica e sanitária de sementes de araçá (Psidium cattleianum Sabine - Myrtaceae) provenientes de frutos amarelos e vermelhos.

Resumo

Cosmological scenarios from multiquintessence

In this work we derive and analyse cosmological scenarios coming from multi-component scalar field models. We consider a direct sum of a sine-Gordon with a Z2 model, and also a combination of those with a BNRT model. Moreover, we work with a modified version of the BNRT model, which breaks the Z2 x Z2 symmetry of the original BNRT potential, coupled with the sine-Gordon and with the standard Z2 models. We show that our approach can be straightforwardly elevated to $N$ fields. All the computations are made analytically and some parameters restriction is put forward in order to get in touch with complete and realistic cosmological scenarios