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Engineering development of flexible selectivity grids for Nephrops ArchiMer
Loaec, Henri; Morandeau, Fabien; Meillat, Marc; Davies, Peter.
There are different approaches to selectivity, including increasing cod-end mesh size, square mesh panels and rigid grids. Selectivity grids have traditionally been produced to be as rigid as possible to maintain spacing but this can result in heavy, expensive grids, handling problems and brittleness. This paper presents an alternative approach using flexible polyurethane polymers to produce lightweight inexpensive grids with much improved damage tolerance and ease of handling, which also possess interesting selectivity characteristics. The material selection, design and development tests are described first, then preliminary sea trial results are presented. A flexible grid with a 20 mm spacing between bars performed successfully and enabled a reduction in...
Tipo: Text Palavras-chave: Damage resistance; Polyurethane; Nephrops; Grid; Size selection; By catch; Selectivity.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1690.pdf
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Estimativa de atributos do solo por meio de espectrorradiometria difusa Rev. Bras. Ciênc. Solo
Cezar,Everson; Nanni,Marcos Rafael; Demattê,José Alexandre M.; Chicati,Marcelo Luiz; Oliveira,Roney Berti de.
Diversos avanços têm sido conquistados no campo da espectrorradiometria difusa, nas últimas décadas. Na área agrícola, a busca por métodos de quantificação de atributos físicos e químicos do ambiente de produção, com base na reflectância do solo, tem sido pesquisada constantemente. O objetivo deste trabalho foi avaliar a possibilidade de estimar os teores de silte, areia, argila, soma de bases, matéria orgânica e ferro total em amostras de solo, a partir de sua energia refletida. As amostras foram coletadas em uma área de 2.500 ha, localizada na região noroeste paranaense, composta por solos das classes Latossolo Vermelho, Nitossolo Vermelho, Argissolo Vermelho, Cambissolo Háplico e Neossolo Quartzarênico. As profundidades de amostragem foram de 0-0,2 e...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reflectância; Grid; Regressão linear múltipla; Predição.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400004
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Etude et mise au point d'un chalut muni d'une grille sélective à langoustine (Campagne selmerl 2, juin 2002 ) ArchiMer
Morandeau, Fabien; Meillat, Marc.
Poursuite des essais de mise au point d'une grille sélective à langoustine des mois avril et mai 2002. Des chaluts jumeaux sont utilisés afin de comparer le dispositif à tester. La zone couverte concerne la pêcherie langoustine et merlu dans le sud ouest des îles Glénan et l'ouest de l'île de Groix. La période est le mois de juin, époque favorable pour les espèces mentionnées ci-dessus. Deux nouvelles grilles bizeautées ont été réalisée par le laboratoire matériaux et structure du centre IFREMER de Brest . Les premiers résultats sont négatifs en ce qui concerne le «tri» de la langoustine effectué par la petite grille souple bizeautée .
Tipo: Text Palavras-chave: Breizline; Codend; Nephrops grid; Grid; Selectivity; Fishing; Chaussettes; Polyéthylène; Breizline; Cul de chalut; Grille à langoustines; Grille; Sélectivité; Pêche.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/rapport-6758.pdf
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Preliminary results of a trawl fitted with a selective grid for the fishery of benthic species from Celtic Sea and Bay of Biscay ArchiMer
Meillat, Marc; Dupouy, Herve; Bavouzet, Gerard; Kergoat, B.; Morandeau, Fabien; Gaudou, Olivier; Vacherot, Jean-philippe.
The fishery for benthic species (Monkfish, Megrim, Rays, etc ... ) represents for the surrounder countries of the Celtic Sea and the Bay of Biscaye one of the most important activities . An estimate of the discards of the main species resulting from the sorting practice onboard of the trawlers participating in this fishery was made in 1985 and 1991. it was concluded that an important quantity of juveniles of Rays, Megrim and Monkfish are discarded each year causing an important mortality. The aim of the present paper is to present the preliminary results of a selectivity grid fixed on a bottom trawl to limit as possible the discards. Three different grids were tested at sea during surveys with different results. The major problem is due to difference in...
Tipo: Text Palavras-chave: Chalut sélectif; Grille; Mer Celtique; Golfe de Gascogne; Baudroies; Sardines; Raies; Selectivity; Grid; Trawl; Celtic Sea; Bay of Biscaye; Monkfish; Megrim; Rays.
Ano: 1991 URL: https://archimer.ifremer.fr/doc/00394/50567/51258.pdf
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Pricing Fed Cattle on a Grid: An Analysis of the Incentive Mechanism over Time AgEcon
Fausti, Scott W.; Wang, Gerald; Diersen, Matthew A.; Qasmi, Bashir A..
Empirical results suggest that the grid premium and discount structure is slowly adjusting carcass quality incentive/disincentive market signals to encourage marketing on a grid and discourage marketing by the pen. If this trend continues, grid market share of steer and heifer slaughter volume should increase in the future.
Tipo: Presentation Palavras-chave: Fed cattle; Grid; Marketing; Market share; Livestock production; Livestock Production/Industries; Marketing; Research Methods/ Statistical Methods; Q13.
Ano: 2012 URL: http://purl.umn.edu/119670
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