Effective governing equations for poroelastic growing media

A new mathematical model is developed for the macroscopic behaviour of a porous, linear elastic solid, saturated with a slowly flowing incompressible, viscous fluid, with surface accretion of the solid phase. The derivation uses a formal two-scale asymptotic expansion to exploit the well-separated length scales of the material: the pores are small compared to the macroscale, with a spatially periodic microstructure. Surface accretion occurs at the interface between the solid and fluid phases, resulting in growth of the solid phase through mass exchange from the fluid at a prescribed rate (and vice versa). The averaging derives a new poroelastic model, which reduces to the classical result of Burridge and Keller in the limit of no growth. The new model is of relevance to a large range of applications including packed snow, tissue growth, biofilms and subsurface rocks or soils

Avaliação econômica e análise de risco da aplicação de calcário na linha de semeadura na cultura da soja.

Avaliar economicamente o efeito da aplicação de calcário finamente moído na linha de semeadura da soja, determinar as quantidades deste insumo que possibilita maximizar o lucro do agricultor e selecionar através da análise de biorisco a alternativa tecnológica que envolve menor risco para o produtor.bitstream/item/133889/1/ID9942-1981-1982sojaresultados-p99-108.pdfTrabalho apresentado na X Reunião de Pesquisa de Soja da Região Sul, Porto Alegre, 1982

Aplicação de calcário na linha de semeadura para cultura da soja.

As recomendações de calcário adotadas baseiam-se atualmente nas quantidades necessárias para elevar o pH do solo a 6,0, promovendo com isso a neutralização do alumínio tóxico (e manganês) para as plantas.bitstream/item/83844/1/CNPT-CIRCULAR-1-APLICACAO-DE-CALCARIO-NA-LINHA-DE-SEMEADURA-PARA-CULTURA-DE-SOJA-FL-13416.pd

Sistemas de produção de grãos com pastagens anuais de inverno, para a região Sul do Brasil, sob sistema plantio direto.

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Silicon photomultiplier arrays - a novel photon detector for a high resolution tracker produced at FBK-irst, Italy

A silicon photomultiplier (SiPM) array has been developed at FBK-irst having 32 channels and a dimension of 8.0 x 1.1 mm^2. Each 250 um wide channel is subdivided into 5 x 22 rectangularly arranged pixels. These sensors are developed to read out a modular high resolution scintillating fiber tracker. Key properties like breakdown voltage, gain and photon detection efficiency (PDE) are found to be homogeneous over all 32 channels of an SiPM array. This could make scintillating fiber trackers with SiPM array readout a promising alternative to available tracker technologies, if noise properties and the PDE are improved

Respostas a tecnologias de trigo nos anos de 1981 e 1982.

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