Hemispherical power asymmetries in the WMAP 7-year low-resolution temperature and polarization maps

We test the hemispherical power asymmetry of the WMAP 7-year low-resolution temperature and polarization maps. We consider two natural estimators for such an asymmetry and exploit our implementation of an optimal angular power spectrum estimator for all the six CMB spectra. By scanning the whole sky through a sample of 24 directions, we search for asymmetries in the power spectra of the two hemispheres, comparing the results with Monte Carlo simulations drawn from the WMAP 7-year best-fit model. Our analysis extends previous results to the polarization sector. The level of asymmetry on the ILC temperature map is found to be compatible with previous results, whereas no significant asymmetry on the polarized spectra is detected. Moreover, we show that our results are only weakly affected by the a posteriori choice of the maximum multipole considered for the analysis. We also forecast the capability to detect dipole modulation by our methodology at Planck sensitivity.Comment: 7 pages, 9 figures. Accepted for publication in MNRA

Água-de-coco: métodos de conservação.

Atualmente, a cocoicultura e considerada a segunda cultura frutifera de importancia economica na regiao Nordeste brasileira, tendo os Tabuleiros Costeiros como maiores produtores. Em meados de 1990, ocorreu uma busca acirrada por produtos de coco oriundos ded paises africanos e asiaticos que trabalham com culturas subsidiadas (Sri Lanka, Costa do Marfin, Indonesia e Felipinas). O preco atrativo nao permitia a concorrencia com os produtos de origem nacional, levando os produtos de coco da regiao a situacoes de inviabilizacao de suas culturas. (...) Atualmente, a agua de coco verde consiste em um grande ramo de comercializacao de cocos da variedade anã verde, com acessos notadamente a mercados distantes dos produtores.bitstream/CNPAT-2010/4873/1/Dc-037.pd

Reverse engineering of double compressed images in the presence of contrast enhancement

Abstract-A comparison between two forensic techniques for the reverse engineering of a chain composed by a double JPEG compression interleaved by a linear contrast enhancement is presented here. The first approach is based on the well known peak-to-valley behavior of the histogram of double-quantized DCT coefficients, while the second approach is based on the distribution of the first digit of DCT coefficients. These methods have been extended to the study of the considered processing chain, for both the chain detection and the estimation of its parameters. More specifically, the proposed approaches provide an estimation of the quality factor of the previous JPEG compression and the amount of linear contrast enhancement

Image Forgery Localization via Fine-Grained Analysis of CFA Artifacts

In this paper, a forensic tool able to discriminate between original and forged regions in an image captured by a digital camera is presented. We make the assumption that the image is acquired using a Color Filter Array, and that tampering removes the artifacts due to the demosaicking algorithm. The proposed method is based on a new feature measuring the presence of demosaicking artifacts at a local level, and on a new statistical model allowing to derive the tampering probability of each 2 × 2 image block without requiring to know a priori the position of the forged region. Experimental results on different cameras equipped with different demosaicking algorithms demonstrate both the validity of the theoretical model and the effectiveness of our schem

Manejo da cultura do girassol: uma abordagem técnica de uso prático.

Genótipos: variedades, híbridos. Adubação: nitrogênio, fósforo, potássio, micronutrientes. Preparo do solo: preparo convencional, semeadura direta. Semeadura. Colheita Identificação e manejo de doenças: mancha de alternaria, esclerotínia/podridão branca, míldio, manejo das doenças. Manejo de plantas daninhas: herbicidas para dessecação de plantas daninhas em présemeadura, herbicidas pré-emergentes registrados no Ministério da Agricultura, Pecuária e Abastecimento para a cultura do girassol. Efeito residual de herbicidas. Pragas do girassol: lagartas, Lagarta-do-girassol (Chlosyne lacinia saundersi), Falsa-medideira (Rachiplusia nu), Lagarta-rosca (Agrotis ipsilon). Besouros: Diabrotica speciosa, Besouro-do-girassol (Cyclocephala melanocephala), Larva-angorá (Astylus variegatus).Percevejos: Percevejo-verde (Nezara viridula, Edessa meditabunda, Euchistus heros, Piezodorus guildinii, Scaptocoris castanea. Produtos registrados no Ministério da Agricultura, Pecuária e Abastecimento para a cultura do Girassol. Literatura recomendada.bitstream/item/60824/1/girassol.pd

Horário de alimentação para aves de corte em época de calor.

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