Métodos exploratórios na avaliação da distribuição espacial de percevejos da soja.

O objetivo desse trabalho é informar a importância da análise exploratória na pesquisa agrícola e quais métodos selecionar para melhor interpretação dos dados

Uso da krigagem indicatriz na avaliação espacial de percevejos da espécie Piezodorus guildinii na safra 2011/12.

Nesse estudo foi estimado a flutuação populacional de Piezodorus guildinii na cultura da soja utilizando o método da krigagem indicatriz

BEC-BCS crossover in a cold and magnetized two color NJL model

The BEC-BCS crossover for a NJL model with diquark interactions is studied in the presence of an external magnetic field. Particular attention is paid to different regularization schemes used in the literature. A thorough comparison of results is performed for the case of a cold and magnetized two-color NJL model. According to our results, the critical chemical potential for the BEC transition exhibits a clear inverse magnetic catalysis effect for magnetic fields in the range $1 \lesssim eB/m_\pi^2 \lesssim 20$. As for the BEC-BCS crossover, the corresponding critical chemical potential is very weakly sensitive to magnetic fields up to $eB \sim 9\ m_\pi^2$, showing a much smaller inverse magnetic catalysis as compared to the BEC transition, and displays a strong magnetic catalysis from this point on.Comment: 15 pages, 8 figures; v2 PRD versio

Seasonal Botanical Composition and Available Forage of Natural Grasslands in the Southeastern Range Region of Rio Grande Do Sul, Brazil

The objective of the study was to verify the influence of climatic seasons on botanical composition and on available dry matter of grasslands in the physiographic region known as Serra do Sudeste (Southeastern Range), RS, Brazil. The climate is Cfb according to Koëppen`s classification. The experiment was conducted in two natural grasslands submitted to two pre-experimental stocking rates [area 1: 0.65 AU ha-1 (normal grazing); area 2: over 2.0 AU ha-1 (overgrazing); AU: Animal Unit = 500kg live weight]. Stocking rates throughout the experimental period (June 1996–July 1997) were 0.4 and 0.65 AU ha-1, over winter and the other seasons, respectively. The evaluations were made at the end of each season, using the Botanal package. There was a short forage supply over late autumn/early winter. The two species groupings warm-season grasses (70–78% of total dry matter) and broad leaves (18– 24%) were the main components of the vegetation in the lower layer of the two grasslands. Warm-season grasses had their participation slightly increased during the warmer seasons. The pre-experimental overgrazing of area 2 favoured the contribution of the minor groups cool-season grasses, warm-season legumes and cool-season legumes