Thermal Stratification
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Numerical and experimental evaluation of the thermally stratified atmospheric boundary layer in wind tunnels
Abstract The atmospheric boundary layer (ABL) flow occurs due to the interaction between the Earth’s surface and atmosphere, and it usually happens under thermal stratification. Therefore, in order to emulate this phenomenon, atmospheric wind tunnels need appropriate devices, such as spires and cubical roughness elements, at the entrance of the wind tunnel
REM, Int. Eng. J.. Publicado em: 2021-01
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2. The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance
Abstract Sedimentologic and stratigraphic studies of paleo-deserts from the Brazilian Cretaceous are of great potential to understand the paleoclimate and paleogeography of Gondwana during its final rifting stage. Herein, we describe and discuss two depositional units characterized by two distinct eolian systems that are bounded by a long-lived unconformity.
Braz. J. Geol.. Publicado em: 11/11/2019
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3. Zooplankton community attributes in an oligo-mesotrophic reservoir: A comparative study of two sampling strategies
Abstract Studies of the limnetic zooplankton in Brazilian freshwater have been done using several sampling strategies which are frequently associated to personal preferences, system constraints and objectives of the studies. It is known that a better sampling technique exists for each group of investigated zooplankton. So, the challenge is to provide a good
An. Acad. Bras. Ciênc.. Publicado em: 17/12/2018
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4. Morphometry and mixing regime of a tropical lake: Lake Nova (Southeastern Brazil)
ABSTRACT Lake Nova (15.5 km2) is the second largest lake in the Lower Doce River Valley (Southeastern Brazil). A better understanding of ecosystem structure and functioning requires knowledge about lake morphometry, given that lake basin form influences water column stratification. The present study aims to contribute to the understanding of relationship bet
An. Acad. Bras. Ciênc.. Publicado em: 01/09/2016
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5. Estudo temporal da estratificação no reservatório da Usina Hidrelétrica de Itaipu e suas influências nos drenos de fundação da barragem de concreto (estudo de longo período) / Study of Temporal Stratification in the resevoir of Itaipu Hydroeletric Power Plant and its influences at the fundation drains of the concrete barrage (long term study)
Com a ocorrência das estratificações térmicas em reservatórios de Usinas Hidrelétricas há geralmente decréscimo de pH em regiões profundas. A água mais ácida entra por escontinuidades (fissuras) da rocha de fundação e pode ocorrer liberação de bicarbonatos destas rochas e das cortinas de injeção. Os bicarbonatos podem depositar em drenos da
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/05/2011
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6. Influência de polimorfismos em genes de metabolismo de xenobióticos e reparação de DNA no risco ocupacional de mineiros de carvão a céu aberto
Colombia has one of the world s largest coal reserves being the fifth biggest thermal coal exporter world-wide. In open-cast coal mining extraction, large amounts of dust particles and heavy metals are released into the atmosphere, where they can form complex mixtures, representing a significant health risks to occupationally exposed workers. In addition, in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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7. Papel da alça microbiana na dinâmica trófica de um lago de várzea na Amazônia Central
During the hydrologic year of 2007-2008, the lago Catalão, a floodplain lake which is influenced by two of the worlds largest rivers (Solimões and Negro), was studied in terms of the dynamic of water column and the trophic dynamic of the microbial food web. At the beginning of the flood the lago Catalão is influenced by the rio Negro and at the end of thi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/03/2010
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8. Estrutura organizacional do fitoplâncton nos sistemas lóticos e lênticos da bacia do Tietê-Jacaré (UGRHi-Tietê-Jacaré) em relação à qualidade da água e estado trófico
The aim of this work was to study the phytoplankton structure of lentic and lotic systems of Tietê/Jacaré basin located in São Paulo State and the relationship between the composition and dominance of phytoplankton organisms with the water quality and trophic state of the rivers and lakes of this basin. The Tietê/Jacare basin is composed by three main ri
Publicado em: 2009
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9. Eutrophication of Cruzeta reservoir in the representative basin of the Seridó river - RN. Natal / Eutrofização do Reservatório Cruzeta na bacia representativa do rio Seridó RN
Eutrophication has been listed as one of the main problems of water pollution on a global level. In the Brazilian semi-arid areas this problem takes even greater proportions due to characteristical water scarcity of the region. It is extremely important to the predictive eutrophication models development and to the reservoirs management in the semi-arid regi
Publicado em: 2008
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10. Comportamento de variáveis físicas, químicas e da eficiência de sistemas de lagoas de estabilização em ambiente tropical (Vale do Ribeira de Iguape, SP) / Behavior of physical, chemical variable and efficiency of systems composed by stabilization ponds in tropical environment (Vale Ribeira de Iguape, SP, Brazil)
As lagoas de estabilização compõem sistemas de tratamento de águas residuárias sujeitos à variação de eficiência decorrente, dentre outros fatores, das variações climáticas. A variação de eficiência e da estratificação em lagoas de estabilização, localizadas em ambiente subtropical, em diferentes épocas do ano, foi o principal objetivo de
Publicado em: 2007
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11. Aspectos limnológicos e sanitários de uma lagoa costeira no litoral leste do Ceará - lagoa do Batoque / Limnological and sanitary aspects of a coastal lagoon in the eastern coast of Ceará lagoa do Batoque
The water quality of Batoque lagoon, a coastal lagoon located along the eastern shoreline of the state of Ceará, Brazil, was characterized by means of monthly samplings from May to November 2005 to obtain dry-season (May-Jun) and wet-season (Aug-Nov) data. Additionally, two nycthemeral (24hr.) samplings were performed in July and December to observe daily v
Publicado em: 2006
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12. Experimental investigation of turbulent boundary layers over steep two-dimensional elevations
This work presents a laboratory study on the behavior of turbulent boundary layers over steep topographic elevations. Two main topics of interest are addressed here: (i) to investigate and characterize the separated flow region that is formed on the leeside of a steep elevation, and (ii) to evaluate the effects of flow stability conditions on the properties
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-12