992 resultados para 199-1217


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XX1 CUIEET - Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas, Valencia, 2013.

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[ES] El objetivo del artículo es explorar la potencialidad de la Evaluación Multi-criterio Social como enfoque metodológico para evaluar Espacios Naturales Protegidos (ENP) e iniciar un proceso de discusión sobre la conveniencia de incorporar esta metodología para la gobernanza de la Red Natura 2000 de la Comunidad Autónoma de Euskadi. Del caso de estudio analizado se desprende que la inclusión de la población local en un proceso participativo dirigido a la planificación y manejo de los ENP contribuiría a reducir el número y calado de conflictos potenciales. Asimismo, facilitaría la gobernanza efectiva de los ENP, lo que parece un reto ineludible para que las áreas protegidas logren sus objetivos y funciones.

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Shear banding characterization of Zr64.13Cu15.75Ni10.12Al10 and Zr65Cu15Ni10Al10 bulk metallic glasses (BMGs) with significant difference in inherent plasticity and quite similar chemical composition was studied by depth sensitive macroindentaion tests with conical indenter. Well-developed shear band pattern can be found for both BMGs after indentation. Distinct difference in the shear band spacing, scale of plastic deformation region and the shear band branching in the two BMGs account for the different plasticity.

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Comunicación presentada en el II Congresso Peninsular de Historia Antigua (Coimbra, 1990)

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The minimum length at first maturity of Clarias lazera was found to be 24 cm (4.8%) for females and 20 cm (1.8%) for males. Fifty percent maturity was attained at length of 28 cm to 30 cm for both sexes; there being little difference among the sexes at this level of maturity. The modal retention lengths for gill nets were: 13 cm for 25.5 mm mesh; 18 cm for 32 mm mesh; 28 cm for 57 mm mesh; and 38 cm for 76 mm mesh. Modal lengths of Clarias lazera caught by various hooks sizes were No. 10 (28 cm); No. 11 (33 cm); Nos. 15 and 16 (28 cm). It is recommended that to protect the clarias fishery in Lake Chad, the use of gill nets of less than 57 mm mesh size and fishing hook No. 16 (and smaller sizes) which caught 43.94% of immature fishes should be discouraged

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The maintenance of adequate dissolved oxygen level is very important in the economy of any aquaculture system. An easy to construct aerating device was created using 0.5 hp water-pump, shower rose, Styrofoam, and rubber hose. The aerator works by drawing water from below and discharging it into the atmosphere as a spray. The spray is aerated as it splashes into the water surface. The aerating device has an average spray of 1.2 unit and doubles the dissolved oxygen content of 37.8 m super(3) tank in one hour

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Fisheries is important to Nigeria agricultural economy because it provides employment for fisherfolks (men and women fishers, fishmongers (fish traders), fish processors and fish farmers. It also supplies protein to the diet of Nigerians and it is equally a viable source of foreign exchange earning to the government.The estimated Nigeria population of 120 million consumes about 1.2million metric tones of fish and fish products annual. This justified the important role fisheries could play in nigerian diet considering that Nigeria has vast inland waters that cover an estimated total surface area of 199,580km super(2) and equally vast sea area of 25,000km super(2). In these waters the author claimed that there are diverse fish resources that are of economic importance in both inland and seawaters. FDF (2000) also estimated that the current annual yield of both inland and seawater put together is about 418,069,3 metric tones from artisanal fisheries and 23,720 metric tones from aquaculture. The shortage between the annual consumption level of 1.2million metric tones and annual yield of 418,069,3 metric tones is made available through importation. It is therefore of concern that given the level of current fish yield from the various fisheries resources the demand still exceeds supply. One wonders whether the production inadequacy is due to poor management of available fisheries resources or that improved fisheries technology that could aid increased production was not efficiently transferred to fish farmers. To answer these questions one need to examine the past and present extension policy in Nigeria as they affect dissemination of fisheries technologies