13,059 research outputs found
Estimativas de parâmetros genéticos na interpopulação de milho (Zea mays L.) BR-105 x BR-106 e suas implicações no melhoramento.
Caracterização físico-química dos frutos dos clones de cajazeira Capuan e Lagoa Redonda submetidos à poda.
A First-Principles Approach to Insulators in Finite Electric Fields
We describe a method for computing the response of an insulator to a static,
homogeneous electric field. It consists of iteratively minimizing an electric
enthalpy functional expressed in terms of occupied Bloch-like states on a
uniform grid of k points. The functional has equivalent local minima below a
critical field E_c that depends inversely on the density of k points; the
disappearance of the minima at E_c signals the onset of Zener breakdown. We
illustrate the procedure by computing the piezoelectric and nonlinear
dielectric susceptibility tensors of III-V semiconductors.Comment: 4 pages, with 1 postscript figure embedded. Uses REVTEX and epsf
macros. Also available at
http://www.physics.rutgers.edu/~dhv/preprints/is_ef/index.htm
Avaliação de progênies de meios-irmãos de variedade de milho Asa Branca no Nordeste Brasileiro.
Dois ciclos de seleção entre e dentro de progênies de meios-irmãos na população de milho CMS 35.
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