Experimental analysis of lateral impact on planar brittle material: spatial properties of the cracks

The breakup of glass and alumina plates due to planar impacts on one of their lateral sides is studied. Particular attention is given to investigating the spatial location of the cracks within the plates. Analysis based on a phenomenological model suggests that bifurcations along the cracks' paths are more likely to take place closer to the impact region than far away from it, i. e., the bifurcation probability seems to lower as the perpendicular distance from the impacted lateral in- creases. It is also found that many observables are not sensitive to the plate material used in this work, as long as the fragment multiplicities corresponding to the fragmentation of the plates are similar. This gives support to the universal properties of the fragmentation process reported in for- mer experiments. However, even under the just mentioned circumstances, some spatial observables are capable of distinguishing the material of which the plates are made and, therefore, it suggests that this universality should be carefully investigated

A Flexible Implementation of a Matrix Laurent Series-Based 16-Point Fast Fourier and Hartley Transforms

This paper describes a flexible architecture for implementing a new fast computation of the discrete Fourier and Hartley transforms, which is based on a matrix Laurent series. The device calculates the transforms based on a single bit selection operator. The hardware structure and synthesis are presented, which handled a 16-point fast transform in 65 nsec, with a Xilinx SPARTAN 3E device.Comment: 4 pages, 4 figures. IEEE VI Southern Programmable Logic Conference 201

Leaf, Pod and Whole Plant Tannin Contents in Pigeon Pea (\u3cem\u3eCajanus cajan\u3c/em\u3e (L.) Millsp)

Tannin content is an important characteristic of leguminous crops and it has been used as a selection criterion in pigeon-pea improvement programmes (Godoy et al., 1994). In south-eastern Brazil, pigeon pea is often consumed by bovines in the dry season (from April though October), after flowering occurs, and is recommended in some cases, specifically for that time of the year (Lourenço et al., 1994). Since tannin content is being used as a selection criterion and the animals in the dry season preferentially eat pods and leaves, an experiment was conducted to compare whole plant, leaf and pod tannin content

Cosmological scenarios from multiquintessence

In this work we derive and analyse cosmological scenarios coming from multi-component scalar field models. We consider a direct sum of a sine-Gordon with a Z2 model, and also a combination of those with a BNRT model. Moreover, we work with a modified version of the BNRT model, which breaks the Z2 x Z2 symmetry of the original BNRT potential, coupled with the sine-Gordon and with the standard Z2 models. We show that our approach can be straightforwardly elevated to $N$ fields. All the computations are made analytically and some parameters restriction is put forward in order to get in touch with complete and realistic cosmological scenarios

TRADE LIBERALIZATION, THE EXCHANGE RATE AND JOB AND WORKER FLOWS IN BRAZIL

Over the 1990's Brazil experienced a massive trade liberalization and wide variation in the real exchange rate. At the same time, employment growth was small and in manufacturing there was a significant reduction in total manufacturing. The main goal of this article is to idntify the effects of the exchange rate and trade liberalization on job and worker flows in Brazil. Using a novel sector exchange rate measure, our results suggest that a depreciation of the exchange rate affects net employment growth by increasing job creation and hires, with no effect on job reallocation. Tariffs have no effect on job or worker flows, while import penetration decrease job growth by increasing job destruction. The results suggest that the echange rate have a very important role on job and worker flows, even after controlling for openess and sector specificities.

Recomendações de cultivares de aveia forrageira para o estado de São Paulo no ano de 2010.

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Recomendação de cultivares de aveia forrageira para o Estado de São Paulo no ano de 2011.

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Ensaio nacional de aveias forrageiras - São Carlos, SP - 2010

O ensaio foi instalado na Embrapa Pecuária Sudeste, em São Carlos, SP, em 17 de maio, sob irrigação por aspersão, em Latossolo Vermelho-Amarelo que recebeu como adubação de plantio 280 kg/ha de 08-28-16, em função das características químicas do solo. A adubação de cobertura foi de 100 kg/ha de sulfato de amônio, três semanas após o plantio, que foi efetuado em 21 de junho de 2010. A emergência das plântulas ocorreu em 28 de junho. A metodologia utilizada foi a prescrita pela Comissão Brasileira de Pesquisa de Aveia, para os ensaios em rede. Os cortes foram efetuados quando as plantas tinham aproximadamente 30 cm de altura. Não houve ocorrência de pragas ou doenças. Foram utilizados nove genótipos de aveia forrageira, sendo seis de aveia branca (PR 126 (T), FAPA 2, FAPA 43, UPF 86081, SI 0502-56M e SI 0501-23M) e três de aveia preta (Iapar 61 (T), UPFA 21 e Comum). Os resultados obtidos de produção de matéria seca são mostrados no Quadro 1. As produções foram relativamente baixas, considerando-se ter sido o experimento conduzido em área irrigada. No geral, a produção total de matéria seca das aveias brancas foi superior, pois a linhagem SI 0501-23M e as cultivares IPR 126 (T) e FAPA 43 superaram a melhor aveia preta, IAPAR 61. As duas primeiras mencionadas também se destacaram no primeiro e segundo cortes e também foram as de ciclo mais longo, tendo sido cortadas seis e cinco vezes, respectivamente. As linhagem SI 0501 ? 23M e a cultivar IPR 126 podem ser recomendadas para produção de forragem na região de São Carlos, SP