137 research outputs found
MONITORAMENTO DOS PROCESSOS EROSIVOS POR VOÇOROCAMENTO NO MUNICÍPIO DE SÃO JOSÉ DE RIBAMAR, ILHA DO MARANHÃO (MA)
O artigo tem a finalidade de apresentar os procedimentos e resultados de monitoramento do processo evolutivo de três áreas degradadas por erosão no município de São José de Ribamar - MA, para esse fim adotou-se os levantamentos cartográficos e bibliográficos; atividades de campo com identificação dos processos erosivos através do monitoramento denominado estaqueamento nas voçorocas do Araçagy I, II e III. Os resultados já alcançados demonstram elevado avanço das cabeceiras das três voçorocas
Measuring in the Early Universe: CMB Temperature, Large-Scale Structure and Fisher Matrix Analysis
We extend our recent work on the effects of a time-varying fine-structure
constant in the cosmic microwave background, by providing a thorough
analysis of the degeneracies between and the other cosmological
parameters, and discussing ways to break these with both existing and/or
forthcoming data. In particular, we present the state-of-the-art CMB
constraints on , through a combined analysis of the BOOMERanG, MAXIMA
and DASI datasets. We also present a novel discussion of the constraints on
coming from large-scale structure observations, focusing in particular
on the power spectrum from the 2dF survey. Our results are consistent with no
variation in from the epoch of recombination to the present day, and
restrict any such (relative) variation to be less than about 4%. We show that
the forthcoming MAP and (particularly) Planck experiments will be able to break
most of the currently existing degeneracies between and other
parameters, and measure to better than percent accuracy.Comment: 11 pages in RevTex4 format. Low-quality figures to comply with arXiv
restrictions (better ones available from the authors). v2: Updated Oklo
discussion, plus other cosmetic changes. Version to appear in Phys Rev
Perturbation evolution with a non-minimally coupled scalar field
We recently proposed a simple dilaton-derived quintessence model in which the
scalar field was non-minimally coupled to cold dark matter, but not to
`visible' matter. Such couplings can be attributed to the dilaton in the low
energy limit of string theory, beyond tree level. In this paper we discuss the
implications of such a model on structure formation, looking at its impact on
matter perturbations and CMB anisotropies. We find that the model only deviates
from CDM and minimally coupled theories at late times, and is well
fitted to current observational data. The signature left by the coupling, when
it breaks degeneracy at late times, presents a valuable opportunity to
constrain non-minimal couplings given the wealth of new observational data
promised in the near future.Comment: Version appearing in Physical Review D. 10 pages, 9 figs. Comparison
with SN1a and projected MAP results, and appendix adde
Contribution of production and seed variables to the genetic divergence in passion fruit under different nutrient availabilities
Toxic effect of commercial formulations of neem oil, Azadirachta indica A. Juss., in pupae and adults of the sugarcane borer, Diatraea saccharalis F. (Lepidoptera: Crambidae)
Extrato aquoso de ramos de Trichilia pallida e o desenvolvimento de Spodoptera frugiperda em genótipos de milho
Estudo da divergência genética entre linhas de suínos utilizando técnicas de análise multivariada
Dinâmica folicular e momento da ovulação em vacas não lactantes das raças Gir e Nelore durante duas estações do ano
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