12,178 research outputs found
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 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.
bitstream/CPPSE-2010/19157/1/PROCICircT61RG2009.00420.pd
Recomendação de cultivares de aveia forrageira para o Estado de São Paulo no ano de 2011.
bitstream/item/40885/1/Comunicado99.pd
Ensaio nacional de aveias forrageiras - SĂŁo Carlos, SP - 2010
O ensaio foi instalado na Embrapa Pecuária Sudeste, em SĂŁo Carlos, SP, em 17 de maio, sob irrigação por aspersĂŁo, em Latossolo Vermelho-Amarelo que recebeu como adubação de plantio 280 kg/ha de 08-28-16, em função das caracterĂsticas quĂmicas do solo. A adubação de cobertura foi de 100 kg/ha de sulfato de amĂ´nio, trĂŞs semanas apĂłs o plantio, que foi efetuado em 21 de junho de 2010. A emergĂŞncia das plântulas ocorreu em 28 de junho. A metodologia utilizada foi a prescrita pela ComissĂŁo Brasileira de Pesquisa de Aveia, para os ensaios em rede. Os cortes foram efetuados quando as plantas tinham aproximadamente 30 cm de altura. NĂŁo houve ocorrĂŞncia de pragas ou doenças. Foram utilizados nove genĂłtipos 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 trĂŞs de aveia preta (Iapar 61 (T), UPFA 21 e Comum). Os resultados obtidos de produção de matĂ©ria seca sĂŁo 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 matĂ©ria 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 tambĂ©m se destacaram no primeiro e segundo cortes e tambĂ©m 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 regiĂŁo de SĂŁo Carlos, SP
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