Ensaio comparativo avançado de arroz de sequeiro em Altamira, Pará - ano agrícola 1998/1999.

bitstream/item/52948/1/PesquisaAnd0160001.pd

BRS Apinajé: cultivar de arroz para a agricultura familiar nas condições de terra firme do Estado do Pará.

bitstream/item/27797/1/Com.tec.207.pdfDisponível também on-line

BRS Jaçanã: cultivar de arroz para áreas de várzea do Estado do Pará.

bitstream/item/27800/1/Com.tec.197.pd

Comportamento da cultivar de arroz BRS Aroma em terra firme no Estado do Pará.

bitstream/item/27840/1/Com.Tec.217.pdfVersão eletrônica. 1ª impressão: 2010

Ensaio comparativo avançado de arroz de sequeiro em Capitão Poço, Pará - ano agrícola 1998/1999.

bitstream/item/52949/1/PesquisaAnd0150001.pd

BRS Sertaneja: cultivar precoce de arroz para terra firme do Estado do Pará.

bitstream/item/27808/1/Com.tec.198.pd

Bonança: cultivar de arroz de sequeiro recomendada para a região nordeste do Estado do Pará.

bitstream/item/27789/1/com.tec.72.pd

CNA 8170: linhagem de arroz adaptada para o ecossistema terra firme do Estado do Pará.

Cópia de trabalho editado em CD-ROM

How Does a Fundamental String Stretch its Horizon?

It has recently been shown that if we take into account a class of higher derivative corrections to the effective action of heterotic string theory, the entropy of the black hole solution representing elementary string states correctly reproduces the statistical entropy computed from the degeneracy of elementary string states. So far the form of the solution has been analyzed at distance scales large and small compared to the string scale. We analyze the solution that interpolates between these two limits and point out a subtlety in constructing such a solution due to the presence of higher derivative terms in the effective action. We also study the T-duality transformation rules to relate the moduli fields of the effective field theory to the physical compactification radius in the presence of higher derivative corrections and use these results to find the physical radius of compactification near the horizon of the black hole. The radius approaches a finite value even though the corresponding modulus field vanishes. Finally we discuss the non-leading contribution to the black hole entropy due to space-time quantum corrections to the effective action and the ambiguity involved in comparing this result to the statistical entropy.Comment: LaTeX file, 38 pages; v2: minor changes and added reference

Performing edge detection by difference of Gaussians using q-Gaussian kernels

In image processing, edge detection is a valuable tool to perform the extraction of features from an image. This detection reduces the amount of information to be processed, since the redundant information (considered less relevant) can be unconsidered. The technique of edge detection consists of determining the points of a digital image whose intensity changes sharply. This changes are due to the discontinuities of the orientation on a surface for example. A well known method of edge detection is the Difference of Gaussians (DoG). The method consists of subtracting two Gaussians, where a kernel has a standard deviation smaller than the previous one. The convolution between the subtraction of kernels and the input image results in the edge detection of this image. This paper introduces a method of extracting edges using DoG with kernels based on the q-Gaussian probability distribution, derived from the q-statistic proposed by Constantino Tsallis. To demonstrate the method's potential, we compare the introduced method with the traditional DoG using Gaussians kernels. The results showed that the proposed method can extract edges with more accurate details.Comment: 5 pages, 5 figures, IC-MSQUARE 201