A cultura do milheto.

bitstream/item/58830/1/ct-11-1.pd

Complete high-precision entropic sampling

Monte Carlo simulations using entropic sampling to estimate the number of configurations of a given energy are a valuable alternative to traditional methods. We introduce {\it tomographic} entropic sampling, a scheme which uses multiple studies, starting from different regions of configuration space, to yield precise estimates of the number of configurations over the {\it full range} of energies, {\it without} dividing the latter into subsets or windows. Applied to the Ising model on the square lattice, the method yields the critical temperature to an accuracy of about 0.01%, and critical exponents to 1% or better. Predictions for systems sizes L=10 - 160, for the temperature of the specific heat maximum, and of the specific heat at the critical temperature, are in very close agreement with exact results. For the Ising model on the simple cubic lattice the critical temperature is given to within 0.003% of the best available estimate; the exponent ratios $\beta/\nu$ and $\gamma/\nu$ are given to within about 0.4% and 1%, respectively, of the literature values. In both two and three dimensions, results for the {\it antiferromagnetic} critical point are fully consistent with those of the ferromagnetic transition. Application to the lattice gas with nearest-neighbor exclusion on the square lattice again yields the critical chemical potential and exponent ratios $\beta/\nu$ and $\gamma/\nu$ to good precision.Comment: For a version with figures go to http://www.fisica.ufmg.br/~dickman/transfers/preprints/entsamp2.pd

Aspectos fotomorfogenéticos de plantas jovens de jatobá (Hymenaea courbaril L.).

Organizado por Patricia Póvoa de Mattos, Celso Garcia Auer, Rejane Stumpf Sberze, Katia Regina Pichelli e Paulo César Botosso

Demandas de serviços no Laboratório de Análises de Sementes da Embrapa Milho e Sorgo (CNPMS) Sete Lagoas, MG.

Edição dos resumos do 18º Congresso Brasileiro de Sementes, 2013, Florianópolis

Germinação de sementes de pau-de-balsa (Ochroma pyramidale (Cav.) Urb.) - Bombacaceae.

O teste de germinação de sementes de Ochrma pyramidale (Cav.) Urb. foirealizado a temperaturas 20°, 25°, 30°, 20°_ 30° e 25°_ 35°C e substratos papel de filtro, areia, venniculita e rolo de papel com seis repetições de 50 sementes. Para a superação de dormência das sementes utilizou-se escarificação mecânica, embebição em água oxigenada e água fervente. Recomenda-se a germinação de sementes de pau-de-balsa em papel de filtro a temperatura de 30°C após imersão em água fervente por 4 minutos