Optical limiting behavior of bismuth oxide-based glass in the visible range

The authors report experimental results on the optical limiting behavior of a bismuth oxide-based glass by exciting the samples with nanosecond laser pulses at 532 and 598 nm. The results show that two-photon and free-carrier absorption processes contribute for the nonlinear absorption. Values for β, the two-photon absorption coefficient, and σe, the absorption cross section due to free carriers, were determined. The values for β and σe are dependent on the amount of bismuth oxide in the glass composition

Genetic divergence among a breeding population of Hancornia speciosa Gomes (Mangabeira) as determined by multivariate statistical methods.

The mangabeira its figure out among the mains native fruit tree explored by extractivism in Brasil. The objective evaluate the genetic divergence of landraces in orientation of crosses using multivariate techinics. The complete random blocks experimental design with four repetitions was used to evaluate twelve quantitative characteristics from twelve genotypes elite of mangabeiras concerning to divergence genetic using the software R (2012). Three groups genetically divergent were composed by biplot graphic and stored by UPGMA cluster analysis (Unweighted Pair-Group Method using Arithmetic Average / Weighted Clustering Method not using the Arithmetic Mean) showing genetic diversity and variability among 12 mangabeira accesses. Forty-four possible crosses are planned among genotypes of genetically dissimilar three groups and six among individuals in group III. Multivariate techniques were appropriate in the study of genetic divergence

Caracterização morfo-agronômica de gergelim, cultivar BRS 196, submetido ao agente químico alquilante EMS.

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Influência da aplicação de reguladores de crescimento na obtenção de populações híbridas de videira.

O objetivo deste trabalho foi verificar a eficiência da aplicação de reguladores de crescimento na obtenção de populações híbridas a fim de gerar novos genótipos para o programa de melhoramento genético da videira da Embrapa Semiárido