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| Registros recuperados: 2.368 | |
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| Theret, Francois. |
| The determination of trawls shapes and tensions is a very complex problem. At this time only the static aspect has been considered, the trawl being placed into a uniform current. Three types of difficulties have been met : - Firstly, the hydrodynamic behaviour of the meshes is not well known ; - Secondly, a net is a complete flexible structure with no own shape unless submitted to the action of external forces, but so we are facing an actual " fluid-structure interaction" problem ; - Thirdly, a flexible reticulate structure is made of an anisotropie and discontinus material. ln this paper, the net studied is a trawl for which, the only parameters known are the drawing and the characteristics of the cables which link it to the trawler. The method that we... |
| Tipo: Text |
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| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00394/50578/51269.pdf |
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| Wagner, H.P.. |
| In addition to a taxonomic review of the whole order Thermosbaenacea, the general morphology and chaetotaxy are discussed in detail. Due to the results of cuticular staining, and through the study of specimens with SEM techniques also, corrections to earlier interpretations could be made. A chaetotaxic classification, modified after the one of Watling (1989), is presented. In the taxonomic part 34 species are recognized, belonging to seven genera (one new), four families (one new). The examination of adult material of the type species of Monodella, i.e., Monodella stygicola Ruffo, 1949, warranted the creation of Tethysbaena gen. nov., to comprise all other taxa previously included in Monodella. Transferred to Tethysbaena are: M. argentarii Stella, 1951; M.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Crustacea; Thermosbaenacea; Morphology; Chaetotaxy; Taxonomy; Phylogeny; Biogeogra- phy.; 42.74. |
| Ano: 1994 |
URL: http://www.repository.naturalis.nl/record/317596 |
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| Veldkamp, J.F.. |
| In 1985 during the Fourth Expedition to S Aceh, Sumatra, in the neighbourhood of the G. Leuser National Park a representative of Sarcotheca (Oxalidaceae) was collected. It clearly is a member of the S. laxa complex previously known only from Malaya and the Riouw Archipelago. It differs from all by the golden puberulous, soon glabrescent innovations, the thicker, broader, more ovate leaflets, and the structure of the inflorescences (short, slender, subequally branched). In the technical characters it seems closest to var. sericea (Ridley) Veldk., but it differs by the leafblades with fewer pairs of nerves, the sparsely white puberulous inflorescence axes and branches (the hairs can easily be distinguished separately and seem longer), the pedicels with the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1994 |
URL: http://www.repository.naturalis.nl/record/525804 |
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| LIMA, A. de A.. |
| Originário de regiões tropicais, o maracujá encontra no Brasil excelente condições para seu cultivo. O Brasil e o primeiro produtor mundial com produção de 172.290 toneladas anuais. O maior volume de trabalho de pesquisa desenvolvidos no país encontra-se nas áreas de fitapatologia, nutrição, melhoramento genético e manejo cultural. As informações existentes nas outras áreas tem pouca expressão. Dentre os aspectos apresentados pelo maracujazeiro destacam-se como problemas ou demandas de pesquisa: controle integrado da morte prematura de plantas; desenvolvimento de variedades para diferentes agro-ecossitemas; obtenção de material propagativo selecionado e multiplicado vegetativamente; controle integrado de doenças do caule e sistema radicular;... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Fitopatologia; Melhoramento genético; Manejo cultural; Morte prematura.; Maracujá; Nutrição.. |
| Ano: 1994 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/637863 |
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| Chavas, Jean-Paul; Cox, Thomas L.. |
| Nonparametric methods for measuring productivity indexes based on bounds for the underlying production technology are presented. Following Banker and Maindiratta, the lower bound is obtained from a primal approach while the upper bound corresponds to a dual approach to nonparametric production analysis. These nonparametric bounds are then used to estimate input-based and output- based distance functions. These radial measures provide the basis for measuring productivity indexes. Application to times series data on U.S. agriculture indicates a large gap between the primal lower bound and the dual upper bound. This generates striking differences between the primal and dual nonparametric productivity indexes. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Productivity Analysis. |
| Ano: 1994 |
URL: http://purl.umn.edu/12613 |
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| Registros recuperados: 2.368 | |
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