890 resultados para Presentes em urochloas decumbens cv Basilick


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Tesis (Maestría en Ciencias Sociales con orientación en Desarrollo Sustentable) UANL, 2014.

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UANL

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Tesis (Doctorado en Ciencias Biológicas con Especialidad en Acuacultura) UANL

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Tesis (Doctor en Ciencias con Acentuación en Productos Naturales) UANL, 2009.

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Ce mémoire s’intéresse au système binaire massif CV Serpentis, composé d’une Wolf- Rayet riche en carbone et d’une étoile de la séquence principale, de type spectral O (WC8d + O8-9IV). D’abord, certains phénomènes affectant les étoiles massives sont mentionnés, de leur passage sur la séquence principale à leur mort (supernova). Au cours du premier cha- pitre, un rappel est fait concernant certaines bases de l’astrophysique stellaire observa- tionnelle (diagramme Hertzsprung-Russell, phases évolutives, etc...). Au chapitre suivant, un des aspects les plus importants de la vie des étoiles massives est abordé : la perte de masse sous forme de vents stellaires. Un historique de la découverte des vents ouvre le chapitre, suivi des fondements théoriques permettant d’expliquer ce phénomène. Ensuite, différents aspects propres aux vents stellaires sont présentés. Au troisième chapitre, un historique détaillé de CV Ser est présenté en guise d’introduc- tion à cet objet singulier. Ses principales caractéristiques connues y sont mentionnées. Finalement, le cœur de ce mémoire se retrouve au chapitre 4. Des courbes de lumière ultra précises du satellite MOST (2009 et 2010) montrent une variation apparente du taux de perte de masse de la WR de l’ordre de 62% sur une période orbitale de 29.701 jours. L’analyse des résidus permet de trouver une signature suggérant la présence de régions d’interaction en corotation (en anglais corotating interaction regions, ou CIR) dans le vent WR. Une nouvelle solution orbitale est présentée ainsi que les paramètres de la région de collision des vents et les types spectraux sont confirmés.

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The Sultanate of Oman is located on the south-eastern coast of the Arabian Peninsula, which lies on the south-western tip of the Asian continent. The strategic geographical locations of the Sultanate with its many maritime ports distributed on the Indian Ocean have historically made it one of the Arabian Peninsula leaders in the international maritime trade sector. Intensive trading relationships over long time periods have contributed to the high plant diversity seen in Oman where agricultural production depends entirely on irrigation from groundwater sources. As a consequence of the expansion of the irrigated area, groundwater depletion has increased, leading to the intrusion of seawater into freshwater aquifers. This phenomenon has caused water and soil salinity problems in large parts of the Al-Batinah governorate of Oman and threatens cultivated crops, including banana (Musa spp.). According to the Ministry of Agriculture and Fisheries, the majority of South Al-Batinah farms are affected by salinity (ECe > 4 dS m-1). As no alternative farmland is available, the reclamation of salt-affected soils using simple cultural practices is of paramount importance, but in Oman little scientific research has been conducted to develop such methods of reclamation. This doctoral study was initiated to help filling this research gap, particularly for bananas. A literature review of the banana cultivation history revealed that the banana germplasm on the Arabian Peninsula is probably introduced from Indonesia and India via maritime routes across the Indian Ocean and the Red Sea. In a second part of this dissertation, two experiments are described. A laboratory trial conducted at the University of Kassel, in Witzenhausen, Germany from June to July 2010. This incubation experiment was done to explore how C and N mineralization of composted dairy manure and date palm straw differed in alkaline non-saline and saline soils. Each soil was amended with four organic fertilizers: 1) composted dairy manure, 2) manure + 10% date palm straw, 3) manure + 30% date palm straw or 4) date palm straw alone, in addition to un-amended soils as control. The results showed that the saline soil had a lower soil organic C content and microbial biomass C than the non-saline soil. This led to lower mineralization rates of manure and date palm straw in the saline soil. In the non-saline soil, the application of manure and straw resulted in significant increases of CO2 emissions, equivalent to 2.5 and 30% of the added C, respectively. In the non-amended control treatment of the saline soil, the sum of CO2-C reached only 55% of the soil organic C in comparison with the non-saline soil. In which 66% of the added manure and 75% of the added straw were emitted, assuming that no interactions occurred between soil organic C, manure C and straw C during microbial decomposition. The application of straw always led to a net N immobilization compared to the control. Salinity had no specific effect on N mineralization as indicated by the CO2-C to Nmin ratio of soil organic matter and manure. However, N immobilization was markedly stronger in the saline soil. Date palm straw strongly promoted saprotrophic fungi in contrast to manure and the combined application of manure and date palm straw had synergistic positive effects on soil microorganisms. In the last week of incubation, net-N mineralization was observed in nearly all treatments. The strongest increase in microbial biomass C was observed in the manure + straw treatment. In both soils, manure had no effect on the fungi-specific membrane component ergosterol. In contrast, the application of straw resulted in strong increases of the ergosterol content. A field experiment was conducted on two adjacent fields at the Agricultural Research Station, Rumais (23°41’15” N, 57°59’1” E) in the South of Al-Batinah Plain in Oman from October 2007 to July 2009. In this experiment, the effects of 24 soil and fertilizer treatments on the growth and productivity of Musa AAA cv. 'Malindi' were evaluated. The treatments consisted of two soil types (saline and amended non-saline), two fertilizer application methods (mixed and ring applied), six fertilizer amendments (1: fresh dairy manure, 2: composted dairy manure, 3: composted dairy manure and 10% date palm straw, 4: composted dairy manure and 30% date palm straw, 5: only NPK, and 6: NPK and micronutrients). Sandy loam soil was imported from another part of Oman to amended the soil in the planting holes and create non-saline conditions in the root-zone. The results indicate that replacing the saline soil in the root zone by non-saline soil improved plant growth and yield more than fertilizer amendments or application methods. Particularly those plants on amended soil where NPK was applied using the ring method and which received micronutrients grew significantly faster to harvest (339 days), had a higher average bunch weight (9.5 kg/bunch) and were consequently more productive (10.6 tonnes/hectare/cycle) compared to the other treatments.

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El proyecto nace con el objetivo de implantar una Infraestructura de Datos Espaciales para la gestión, análisis territorial y difusión de la Comunidad Valenciana, contemplando tanto el nivel autonómico como el municipal. A nivel autonómico, de partida, participan la “Conselleria de Infraestructuras y Transporte” y la “Conselleria de Empresa, Universidad y Ciencia”; a nivel municipal encontramos una primera fase con cuatro ayuntamientos piloto, a los que podrá sumarse cualquier otro de la Comunidad Valenciana en una segunda fase. La IDE tiene dos tipos de clientes como usuarios tipo, por un lado el ciudadano, que podrá acceder tanto al Geoportal autonómico como al de cualquiera de los ayuntamientos participes, por otro el técnico de la administración, que dispondrá de una serie de herramientas para la explotación de la IDE.El proyecto tiene como base la directiva INSPIRE y se estructura sobre una propuesta tecnológica libre, que permita abastecer a todos los municipios de herramientas de gestión territorial libres, manteniendo la autonomía tecnológica de cada uno de ellos. A nivel autonómico, como parte del proyecto, encontraremos un geoportal con los servicios mínimos recomendados por la IDEE, así como una plataforma de e-aprendizaje de las aplicaciones. En dicho portal se dispondrán tanto capas municipales como autonómicas. A nivel municipal, cada ayuntamiento dispondrá de aplicaciones que permitirán generar su geoportal y mantenerlo de manera sencilla. El geoportal dispondrá de herramientas de comunicación con la ciudadanía, que permitan transmitir al ayuntamiento – por medio de la cartografía – incidencias o solicitudes. Además, los técnicos dispondrán de herramientas libres, desarrolladas sobre gvSIG, para la explotación de la IDE, aplicaciones de urbanismo, mantenimiento de callejero y geoestadística

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Este trabajo busca comprender el surgimiento de una nueva estructura geopolítica dentro del sistema internacional haciendo uso de la teoría de Saul Bernard Cohen. Ésta nos permite identificar dos elementos preponderantes de la ubicación geopolítica de Timor Oriental que llegan a influir en sus relaciones bilaterales con Australia. Siendo estos; las Áreas Vacías y los límites. Ellos ayudan a tejer relaciones de cooperación con respecto a la explotación de recursos energéticos y el apoyo de Australia en la construcción de Timor Oriental como Estado. Todo lo anterior, enmarcado en un contexto en el que no es claro a quién pertenecen el gas natural y el petróleo del Mar de Timor puesto que no existe un límite fronterizo determinado entre Australia y Timor Oriental.