Weather Variability
Mostrando 25-36 de 40 artigos, teses e dissertações.
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25. Objective method identification upper-tropospheric cyclonic vortices in the South Tropical region: validation and climatology / Método objetivo de identificação dos vórtices ciclônicos de altos níveis na região tropical sul: validação e climatologia
An Objective Method (OM) to identify Upper-Tropospheric Cyclonic Vortex (UTCV) in South Tropical region was developed based on relative vorticity and on horizontal flow of the wind round the centre of the system. As this synoptic system shows an irregular movement the weather forecasts become complex. The interannual and intrasazonal variability study of the
Publicado em: 2008
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26. Vulnerability of the Minas Gerais landscape to global changes: an initial step to a bottom-up approach / Vulnerabilidade da paisagem de Minas Gerais Ãs mudanÃas globais: um passo inicial para uma abordagem tipo bottom-up.
A temperatura mÃdia do ar no estado de Minas Gerais aumentou 1,4oC, em relaÃÃo aos valores normais, no sÃculo passado. As previsÃes para o sÃculo XXI apontam um aumento de atà 3oC e alteraÃÃes nos padrÃes de distribuiÃÃo e na quantidade das chuvas. Esse cenÃrio poderà afetar a paisagem, por efeitos diretos e indiretos do clima sobre a fisiologi
Publicado em: 2008
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27. O uso de ferramentas fractais e redes complexas no estudo da variabilidade pluviomÂetrica do Nordeste do Brasil
Brazil Northeastâs climate is usually described as semi-arid, characterized by hard dry seasons intermingled by hard rainfall seasons. Some areas of Northeast present annual pluviometric measure about 400 mm in mean, while in others the annual pluviometric measure is about 2000 mm. Rain events result from interplay of several physical phenomena, most of whi
Publicado em: 2007
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28. Study of adhesion time, temperature and gluing pressure on shear strength of Eucalyptus grandis wood glued with adhesive solvent free / Estudo do tempo de adesão, da temperatura e da pressão de colagem na tensão limite de cisalhamento de uniões de madeira de Eucalyptus grandis coladas com adesivo sem solvente
The use of glu-lam is a viable alternative for exploitation of all wood potential presenting a series of advantages. The linking between layers however has a basic paper in glu-lam good quality. Therefore for a good performance of glu-lam structures it is fundamental the choice of an adhesive which has a great mechanics resistance and also resistance to the
Publicado em: 2007
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29. Variabilidade espacial de atributos fisico-hidricos do solo cultivado com feijão irrigado sumetido a diferentes sistemas de preparo / Soil physical-hydric attributes spatial variability doe diferent irrigated bean tillage systems
Since last decades irrigation practices are recognized as major water consumers, requiring specific agricultural producers education and awareness on water use and supply. Recent research reports indicate significant water economy, crop yielding as well as contribution to sustainable agricultural development, if direct seedling, when compared with convention
Publicado em: 2007
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30. AnÃlise multivariada na identificaÃÃo dos fatores determinantes da qualidade da Ãgua na Bacia HidrogrÃfica do Rio Jaibaras-Cearà / Analysis multivariate in the identification of the determinative factores of the quality of the water in the watershed of Rive Jaibaras-CearÃ.
Aiming to identify the apportionment of pollution sources/factors with a view to get better information about the water quality at Jaibaras watershed, a research composed of three steps was developed. In the first step (Step I), it was identified the water pollution sources at the upland of Jaibaras watershed until Ayres de Souza dam. The survey occurred fro
Publicado em: 2006
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31. An analysis of surface fluxes and of the microclimate on cerrado, sugarcane and eucalyptus: implications for regional climate changes / Uma análise dos fluxos de superfície e do microclima sobre cerrado, cana-de-açúcar e eucalipto, com implicações para mudanças climáticas regionais
This work investigates potential regional scale temperature and precipitation changes in the São Paulo state, caused by land use changes. We analised micrometeorological measurements, in the period February 2005 to February 2006, over three different ecosystems (cerrado, sugar cane and eucalyptus plantation). The surface energy balances showed that over the
Publicado em: 2006
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32. WEATHER-RELATED GEO-HAZARD ASSESSMENT MODEL FOR RAILWAY EMBANKMENT STABILITY
The primary objective of this thesis is to develop a model for quantification of weather-related railway embankments hazards. The model for quantification of embankment hazards constitutes an essential component of a decision support system that is required for the management of railway embankment hazards. A model for the deterministic and probabilistic asse
Publicado em: 2005
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33. Aspectos sinóticos associados à ocorrência do jato em baixos níveis na América do Sul - reanálise NCEP/NCAR e simulação com o MCGA CPTEC/COLA / Synoptics aspects associated to the occurrence of the low levels jet in the south America - reanalyses of the NCEP/NCAR and simulation with the MCGA CPTEC/COLA
Cases of LLJ occurrence to the east of Andes were identified in NCEP/NCAR reanalyses data and in daily results of a climate simulation with the CPTEC/COLA AGCM, to identify the associated atmospheric patterns. weather forecasting of a case when there was occurrence of LLJ was also evaluated. Analysis performed in different seasons indicated similar synoptic
Publicado em: 2005
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34. Amônia (NH3) atmosférica: fontes, transformação, sorvedouros e métodos de análise
Ammonia is the most common alkaline gas of the atmosphere, being important in the neutralization of various processes that occur in the atmosphere. Its main sources of emission are the decomposition of organic matter and dejections of animals. Ammonia is used by man in diverse activities of production, therefore it is a gas that can contaminate work environm
Química Nova. Publicado em: 2004-02
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35. Functionality and seasonality on Cerrado and ecotone Forest-Cerrado: an inquiry with micrometeorological data of energy and CO2. / Funcionalidade e sazonalidade sobre cerrano e sobre ecótono floresta-cerrado: uma investigação com dados micrometeorológicos de energia e CO2.
This work discusses the energy and CO2 flux variability over a Cerrado Sensu stricto, in São Paulo state, Brazil, and over a seasonally inundated Forest-Cerrado ecotone in Tocantins state, Brazil. Micrometeorological measurements (30 minute average) of weather (temperature, relative humidity, precipitation and wind speed), radiation fluxes (solar radiation,
Publicado em: 2004
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36. Processamento de imagens AVHRR/NOAA visando o monitoramento de estiagem
A great part of the Brazilian territory is vulnerable to the occurrence of frequent intense dry periods since there is a difference between the precipitation and the annual potential evaporation during the year. Some methods have been proposed to assess and monitor the occurrence of a drought, such as that ones based on agroclimatic indexes calculated with g
Publicado em: 2003