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| Registros recuperados: 144 | |
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| Jax,Kurt; Rozzi,Ricardo. |
| The definition of conservation goals is a complex task, which involves both ecological sciences and social values. A brief history of conservation strategies in Germany (protection of cultural landscapes), United States (wilderness ideal), and southern Chile (preservation paradigm and the more recent interest in ecotourism) illustrates a broad range of conservation goals. To encompass such an array of conservation dimensions and goals, the ecosystem approach adopted by the Conference of the Parties of the Convention on Biological Diversity represents a good approach. However, to become effective, this kind of approach requires clarifying and agreeing upon basic concepts, such as ecosystem. To serve that purpose, we present a scheme that considers the... |
| Tipo: Journal article |
Palavras-chave: Conservation; Comparative approach; Ecological theory; Chile; Ecotourism; Ecosystem management; Germany; Images of nature; Magellan region; Social values; Yellowstone; Yellowstone. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000200012 |
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| Munack, Axel; Schmidt, Lasse; Schröder, Olaf; Schaper, Kevin; Pabst, Christoph; Krahl, Jürgen; ,. |
| The European diesel fuel specification limits the biodiesel content to 7 %. It is, however, desirable to increase the amount of renewables in the transport sector; therefore blending with a higher biogenic fuel content is of interest. Blending of fuels can lead to chemical reactions between fuel components and may result in undesired products. In detail, aged biodiesel from unsaturated FAME and fossil diesel fuels can form oligomers and precipitations with a maximum in the range of B10 to B20. Precursors are oligomers that can be separated from the biodiesel or the blends in an amount of up to 20 %. These oligomers seem to have potency for chemical reactions with fuel components or the engine oil. To prevent tentative problems in the fuel filter, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alcohol; Biodiesel; Emission; Oligomer; Precipitate; Germany. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3082 |
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| Registros recuperados: 144 | |
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