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| Carton, Xavier; Le Cann, Bernard; Serpette, Alain; Dubert, Jesus. |
| In 1990, satellite observations revealed that an anticyclonic surface eddy (a SWODDY, for Slope Water Oceanic eDDY) followed a cycloidal trajectory north of the Iberian coast in the Bay of Biscay. To understand the mechanisms underlying such a trajectory, we study the evolution of an idealized surface eddy in a two-layer flat-bottom quasi-geostrophic model. The effect of several processes is studied, notably the presence of deep anticyclonic vorticity. This deep vorticity may result either from the tilting of the swoddy itself, or from the presence of an anticyclonic eddy of different origins, such as a meddy (Mediterranean Water EDDY). We also study the influence of a zonal coast south of the swoddy, via the "mirror effect". Firstly, a point-vortex model... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; Anticyclonic eddies; Swoddy; Meddy; Point vortex dynamics; Trajectory; Quasi-geostrophic model; In-situ observations. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00125/23589/21478.pdf |
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| Mattei, Lauro Francisco. |
| O artigo faz uma discussão sobre o Programa Nacional de Produção e Uso do Biodiesel (PNPB), que desde 2004 vem ganhando a atenção de vários segmentos sociais, públicos e privados, envolvidos com a busca de alternativas à matriz energética brasileira. Para tanto, o trabalho resgata todo o processo de construção dessa política específica, bem como discute a situação atual do programa, realçando os desafios atuais à luz das experiências internacionais.----------------------------------------------The paper discusses the National Program of Biofuel in Brazil. Since 2004 public and private actors are giving attention to the program, specifically in the actions that are developing to the governmental decisions about energy models in Brazil. So, the study... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Biodiesel; Trajetória; Desafios; Biofuel; Trajectory; Constrains; Resource /Energy Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/109212 |
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| Leguizamón,E.S.; Verdelli,D.M.; Acciaresi,H.. |
| Concerns about the sustainability of large-scale, direct-drilled RR-soybeans (Glycine max), and RR-maize (Zea mays) under monoculture in central Argentina are growing steadily. An experiment was conducted during three consecutive years to determine the effects of crops and systems (monocultures and strips) and herbicide strategy on weed density, population rate of change (l), b community diversity (H´), crop yields and Land Equivalent Ratio (LER). Not only crops but also crop systems differentially influenced weed densities along their growth and development. For crop harvests, weed densities increased in both maize crop systems as compared to in the one for soybeans, but the lowest increase occurred in soybean strips. Differences were leveled by both... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Strip-intercropping; Trajectory; Weed shifts; Herbicide environmental load; Environmental impact quotient. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000400022 |
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