Water Fluxes
Mostrando 13-24 de 148 artigos, teses e dissertações.
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13. Evapotranspiração em plantio de milho no cerrado.
RESUMO: O milho (Zea mays L.) é uma cultura de destaque no Cerrado e a disponibilidade de água é considerada um fator ambiental determinante na produtividade dessa cultura. Este trabalho teve como objetivo fornecer as taxas de evapotranspiração, relacionando-as com fatores ambientais em dias sem precipitação durante a estação chuvosa, de um plantio
Planaltina. Publicado em: 2011
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14. Balanço de energia de uma pastagem cultivada no cerrado.
RESUMO: O cerrado possui aproximadamente 208 milhões de hectares sendo 49 milhões de pastagens cultivadas. O objetivo deste trabalho foi apresentar o balanço de energia na superfície de uma pastagem de Brachiaria brizantha cv. Marandu localizada na região central do cerrado (Planaltina - GO). O estudo foi realizado de 15/11 a 09/12/2001, inicio da esta�
Planaltina. Publicado em: 2011
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15. Levantamento dos níveis de radioatividade natural em águas do alto Vale do Ribeira à planície costeira do litoral sul do Estado de São Paulo / Assessment of natural radioctivity levels in waters from Higher Ribeira Valley until the southern Sao Paulo State coastal plain
The complex exchange of fluvial, subsurface and seawater within a coastal area directly affects global biogeochemical cycles and the application of isotopic tracers, mainly natural radionuclides from U and Th series, is a powerful tool to track sources and sinks of trace elements and nutrients to this systems. The unique Ra signature applied to quantify the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/11/2010
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16. Modeling electrodialysis and a photochemical process for their integration in saline wastewater treatment
Oxidation processes can be used to treat industrial wastewater containing non-biodegradable organic compounds. However, the presence of dissolved salts may inhibit or retard the treatment process. In this study, wastewater desalination by electrodialysis (ED) associated with an advanced oxidation process (photo-Fenton) was applied to an aqueous NaCl solution
Brazilian Journal of Chemical Engineering. Publicado em: 2010-09
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17. A finite element model for the ocean circulation driven by wind and atmospheric heat flux
A finite element model for solving ocean circulation forced by winds and atmospheric heat fluxes is presented. It is vertically integrated 1 1/2 layer model which solves the motion and continuity hydrodynamic equations coupled with the advection-diffusion transport equation for temperature. A space-time Petrov-Galerkin formulation is used to minimize the und
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03
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18. Composição isotópica e fluxos de CO2 em área de Cerrado (Parque Estadual de Vassununga, SP) / Isotopic composition and carbon dioxide fluxes in an area of Cerrado (State Park of Vassununga, SP)
The presente study was carreid out in area o Cerrado strictu senso located at the State Park of Vassununga, closed to the Santa Rita do Passa Quatro city, São Paulo State, Brazil. The aim was of the present work was to measure de CO2 fluxes released through respiration processes of the vegetation and soil (heterotrophic and autotrophic) to check the relativ
Publicado em: 2010
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19. Study of the use of alternative fluxing agents to the feldspar in porcelainized stoneware tile compositions / Estudo da utilização de fundentes alternativos ao feldspato em composições de porcelanato
The porcelainized stoneware has been outstanding in the current market of ceramic tiles because it offers excellent technical and esthetic features. In this research traditional ceramic raw materials were selected and a standard formulation reported in the literature was adopted, aiming to replace the vitreous phase former (feldspar) from the composition by
Publicado em: 2010
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20. Molecular diversity of Archaea in Amazonian River sediments and characterization of cultured methanogenic species. / Diversidade molecular de arqueias em sedimentos de rios da Amazônia e caracterização de espécies metanogênicas cultivadas.
High positive fluxes of methane to the atmosphere have been detected in the Amazonian region. Methane is the second most important greenhouse gas and microorganisms belonging to the Archaea domain are responsible for approximately 70% of the total methane emitted to the atmosphere annually. The objective of this work was to characterize the Archaea diversity
Publicado em: 2010
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21. Water and energy fluxes in cowpea and castor beans cultivated in northeast Brazil / Fluxos de Ãgua e de energia em feijÃo macassar e mamona no nordeste do Brasil
The castor beans and cowpea are crops of enormous economic and social importance for the farmers in northeast Brazil, whereas the extracted oil of seeds of castor beans is used for production of biodiesel and the cowpea is the main food for poor population. Independent of crop type, the knowledge of water amount removed from soil by vegetation is of great in
Publicado em: 2009
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22. Variações de curto prazo nas emissões de CO2 do solo em diferentes sistemas de manejo do cafeeiro
Soil CO2 emissions represent an important component of carbon global cycle. However, information about short-term alterations of CO2 fluxes in soils of tropical regions are scarce. So, the objective of this study was to evaluate such variations in coffee plantations in Latosol (Oxisol). The CO2 emissions were not affected by environmental abiotic factors, su
Química Nova. Publicado em: 2009
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23. Fluxos de emergência, épocas de aplicação de herbicidas e sistemas de manejo de plantas daninhas em cana-de-açúcar / Emergence fluxes, herbicide application timings and weed management systems in sugarcane
The knowledge of the effects of the population dynamics and establishment velocity of weeds on the efficacy of weed management in the sugarcane crop is fundamental for the development of a rational plan of integrated weed management in the crop. Therefore, the objectives of the present research were: (i) to quantify the monthly fluxes of weed emergence year
Publicado em: 2009
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24. Integração dos processos de eletrodiálise e de degradação fotoquímica para o tratamento de efluentes salinos contendo fenol. / Integration of electrodialysis and photochemical degradation process for the treatment of a saline wastewater containing phenol.
Chemical oxidation processes can be used to treat industrial wastewater containing non-biodegradable organic compounds. However, the presence of dissolved salts may inhibit or retard the treatment process. In this work, a coupled process is studied including a desalination step by electrodialysis (ED) associated with an advanced oxidation process (photo-Fent
Publicado em: 2009