Consulta: subjectFacets:"Flow"
Registros recuperados: 17
Data/hora: 05/06/2024 11:23:38

Áreas para captação de água de chuva
Provedor de dados: Ciências Agrárias: Repositório Eletrônico do Departamento de Ciências Agrárias da Unitau
Autores: André Luiz Rezende, Ferreira; Getulio Teixeira, Batista; Paulo, Fortes Neto.
Este artigo constitui-se da revisão de artigos científicos, livro e revista com o intuito de fazer uma análise das áreas de captação da água de chuva. Inicialmente foi feito um estudo das reservas de água no planeta,  simbolismo nas religiões, consumo humano, uso sustentável, demanda, uso irracional e problemas da escassez. Em seguida, foi abordado o uso do telhado convencional com melhor inclinação e escoamento, tipos de cobertura com melhor coeficiente de escoamento (argamassa de cimento e areia, telha de cerâmica, telha de fibrocimento, lona plástica de polietileno), telhado verde (retenção, escoamento, qualidade da água) e chão (contra-piso, estradas, encostas) como áreas de captação.
Tipo: Article
Palavras-chave: Água de chuva; Escoamento; Captação; Catchment; Flow; Rainwater.
Ano: 2011
URL: http://hdl.handle.net/2315/173

Estudo do uso e cobertura do solo e do escoamento superficial na bacia hidrográfica do Ribeirão Serragem no município de Tremembé, SP
Provedor de dados: Ciências Agrárias: Repositório Eletrônico do Departamento de Ciências Agrárias da Unitau
Autores: Rodrigues, Neyrianne d´Angelis; Batista, Getulio Teixeira; Targa, Marcelo dos Santos.
O presente trabalho objetivou avaliar o escoamento superficial da área que engloba os afluentes do Ribeirão Serragem no município de Tremembé, SP no vale do Paraíba do Sul, localizada na parte a montante da barragem da Fazenda Maristela, bem como mapear o uso do solo da mesma para subsidiar possíveis intervenções visando o uso sustentável dessa bacia. Foram empregadas técnicas de geoprocessamento com o uso de ferramentas do SPRING para a caracterização do uso e ocupação do solo, da caracterização física da bacia e para o cálculo da precipitação efetiva. Os resultados indicaram que a bacia do Ribeirão Serragem apresenta um bom estado de conservação, levando em consideração que ocorre o predomínio de florestas em todas as classes de APP com maior predomínio...
Tipo: Article
Palavras-chave: Basin; Flow; Land use; Environmental science.
Ano: 2012
URL: http://hdl.handle.net/2315/242

Caracteristicas digestivas del heno de alfalfa (Medicago sativa), producida en el valle de Mexicali durante dos épocas de corte
Provedor de dados: Depósito Institucional Abierto de Documentos Digitales del Colegio de Postgraduados (COLPOS DIGITAL )
Autores: Rosales Martínez, Gerardo Noé.
El objetivo de este estudio fue evaluar las características de digestión ruminal y  el flujo de nutrientes a duodeno e íleon del heno de alfalfa (Medicago sativa) de  dos épocas de corte (verano e invierno) en novillos Holstein. Se usaron cuatro  novillos Holstein (240±KgPV) con cánulas en rumen, duodeno e íleon. Los  tratamientos fueron heno de alfalfa de verano (HAV) y heno de alfalfa de  invierno (HAI), en un diseño cross over. Los datos se analizaron con PROC  GLM de SAS y se usó la prueba de Tukey para comparar las medias. Se  analizó la composición del heno y se midieron variables de digestión. El flujo a  duodeno de MS, MO, FDN, FDA y NN, al igual que el flujo a íleon de MS, MO,  FDN, y FDA fue mayor (P!0.10) para el HAV en comparación al HAI. La...
Tipo: Tesis
Palavras-chave: Heno de alfalfa; Rumen; Digestibilidad; Flujo; Maestría; Ganadería; Alfalaf hay; Digestibility; Flow.
Ano: 2008
URL: http://hdl.handle.net/10521/1511

EVALUATION OF SELF COMPENSATING EMITTERS IRRIGATING WITH SALINE WATER: PART II: PROCESS CAPABILITY INDEX
Provedor de dados: Engenharia Agrícola
Autores: Silva,Patrícia F. Da; Dantas Neto,José; Lima,VERA L. A. DE; Santos,Delfran B. Dos; Ribeiro,Pedro H. P.
ABSTRACT The use of tools such as process capability index for irrigation aims to observe how this irrigation is adequate in terms of quality. The aim of the study was analyzing the Christiansen uniformity coefficient and the flow of a drip irrigation system with self-compensating emitters under water different salt concentrations, using the process capability index. The research was conducted in a greenhouse at the Federal University of Campina Grande (UFCG). The experimental design was a randomized block in a factorial 5 x 2 with three replications, the factors consisted of five levels of irrigation water salinity (CEw) (0.6, 1.5, 2.5, 3.5 and 4.5 dS m−1 at 25°C) and two running times (0 and 350 hours of operation). The Christiansen uniformity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quality engineering; Flow; Quality control; Christiansen uniformity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000601086

Потоки нефтяных углеводородов через морские организмы
Provedor de dados: IBSS Repository
Autores: Миронов, О. Г.
На основе имеющихся многолетних материалов по взаимодействию морских организмов с нефтяным загрязнением проведена оценка потоков нефтяных углеводородов через некоторые организмы. Установлено, что в Севастопольской бухте через бактериальное сообщество морской воды и донных осадков в год трансформируется 4.4 т и 0.02 т нефтяных углеводородов соответственно. Мидиями в обрастании причалов Севастопольской бухты аккумулируется 0.15 т нефтяных углеводородов. Потенциально (по расчетным данным) зоопланктонное сообщество бухты может накапливать и переносить 15 т нефти в сутки. Обсуждается возможность потоков нефтяных углеводородов через другие организмы.
Tipo: Journal Contribution
Palavras-chave: Нефть; Поток; Самоочищение; Морские организмы; Oil; Flow; Self purification; Marine organisms Marine organisms Self purification Oil.
Ano: 2006
URL: http://repository.ibss.org.ua/dspace/handle/99011/287

Aspectos da fenologia de Cordia goeldiana Huber e suas relações com alguns parâmetros climáticos.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: MONTAGNER, L. H.; YARED, J. A. G.
bitstream/item/31921/1/CPATU-BP54.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Freijo; Periodicidade; Queda de Folha; Campo Experimental de Belterra; Santarem; Pará; Brasil; Brazilian walnut; Fenology; Growth; Frutification; Leaf fall.; Crescimento; Cordia Goeldiana; Fenologia; Frutificação.; Floração; Amazonia; Flow; Periodicity.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/381165

Computed residual flow through the Dover Strait
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Salomon, Jean-claude; Breton, Marguerite; Guegueniat, Pierre.
A two-dimensional numerical model was used for the empirical deduction of a mathematical expression of water flow through the Dover Strait, for all conditions of tide, wind and ocean slope.  The theoretical results were correlated with sea measurements of radioactive tracers discharged at La Hague cape.  Nine actual years (1983-1991) were then examined, determining an average annual flow of 114000 mas-1 with a very high monthly variability, but with little difference from one year to the next.  These residual currents being highly sensitive to weather conditions, the mildness of the past few years has occasioned a decrease in fluxes towards the North Sea
Tipo: Text
Palavras-chave: Manche; Pas de Calais; Débit; Modèle; Marée; Channel; Dover Strait; Flow; Model; Tide.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/publication-542.pdf

Dynamics of an estuarine ecosystem - The Chesapeake Bay experience: Statistical approaches and water quality patterns
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Alden, Rw.
A long-term water quality monitoring program has been established in the Virginian waters of the Chesapeake Bay. To date, over eight years of data have been analyzed to characterize spatio-temporal patterns and long-term trends in water quality. Complementary multivariate statistical procedures were employed to define spatial and seasonal patterns, while a series of non-parametric trend analyses were used for determining overall, site-specific, and season-specific long-term trends for water quality variables in the tributaries and mainstem of the Bay. Particular attention was focused on determining the effect of river flow on the trends, because flow rates in some of the tributaries have changed dramatically since the beginning of the monitoring program....
Tipo: Text
Palavras-chave: Water quality; Monitoring; Statistics; Trends; Flow.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20461/18133.pdf

Dynamics of an estuarine ecosystem: The influence of flow patterns on phytoplankton trends in the Chesapeake Bay
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Marshall, Hg; Alden, Rw.
Long term trends in the phytoplankton of the lower Chesapeake Bay were identified using flow corrected and uncorrected data sets, with 22 of 23 significant trends similar under both conditions. The major trends between 1985-1992 were for: 1) reduced phytoplankton concentrations; 2) decreasing numbers of phytoplankton taxa during spring, summer and fall months; and 3) seasonally mixed trends for diatom abundance in waters below the pycnocline, with spring months having decreasing densities, and increasing abundance trends in November and December. The flow patterns had different effects on the trends. Flow diminished the magnitude of the trends for total phytplankton concentrations, so these trends were greater in the flow corrected data. There were mixed...
Tipo: Text
Palavras-chave: Phytoplankton; Chesapeake Bay; Trends; Flow.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20383/18051.pdf

Observed and predicted vertical suspended sediment concentration profiles and bedforms in oscillatory-only flow
Provedor de dados: Open Marine Archive
Autores: Williams, J.J.; Bell, P.S.; Thorne, P.D.; Trouw, K.; Hardcastle, P.J.; Humphrey, J.D.
Measurements of hydrodynamic conditions and vertical suspended sediment concentration profiles, C-profiles, have been obtained above rippled sandy beds in a large wave flume. Measured values of wave height and period, water depth and sediment properties are used in well-known formulae to predict sediment dynamics and bed shear stresses due to waves. These data are then used in an existing convective model and a new model to predict C-profiles. Measured C-profiles and C-profiles predicted by the new model are shown to agree well for a range of grain sizes and wave conditions. Grain-scale bed roughness, defined using data from the model, is found to vary with the wave mobility number. Values for the wave mixing coefficient derived using the new model are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic boundary layer; Flow; Flow; Flow; Model studies; Oscillatory flow; Resuspended sediments; Sand; Sediment dynamics; Vertical profiles; Waves; Waves.
Ano: 2000
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7388

Developing a hydrological model for the Mekong Basin: impacts of basin development on fisheries productivity.
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Kite,   Geoff.
Tipo: Working or Discussion Paper
Palavras-chave: Simulation models; Hydrology; River basins; Water resource management; Productivity; Flow; Fisheries; Mapping; Data collection; Computer techniques; Climate; Soil properties; Stream flow; Dams; Productivity Analysis; Resource /Energy Economics and Policy.
Ano: 2000
URL: http://purl.umn.edu/92781

CLIMATE CHANGE SENSITIVITY ASSESSMENT ON UPPER MISSISSIPPI RIVER BASIN STREAMFLOWS USING SWAT
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Jha,   Manoj K.; Arnold,   Jeffrey G.; Gassman,   Philip W.; Gu,   Roy.
The Soil and Water Assessment Tool (SWAT) model was used to assess the impacts of potential future climate change on the hydrology of the Upper Mississippi River Basin (UMRB). Calibration and validation of SWAT were performed on a monthly basis for 1968-87 and 1988-97, respectively; R2 and Nash-Sutcliffe simulation efficiency (E) values computed for the monthly comparisons were 0.74 and 0.65 for the calibration period and 0.81 and 0.75 for the validation period. The impacts of eight 20-year (1971-90) scenarios were then analyzed, relative to a scenario baseline. A doubling of atmospheric CO2 concentrations was predicted to result in an average annual flow increase of 35 percent. An average annual flow decrease of 15 percent was estimated for a constant...
Tipo: Working or Discussion Paper
Palavras-chave: Climate change; Flow; Hydrology; Simulation; Spatial patterns; Watershed; Environmental Economics and Policy.
Ano: 2004
URL: http://purl.umn.edu/18419

Wastewater use in agriculture: Review of impacts and methodological issues in valuing impacts
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Hussain,   Intizar; Raschid,   Liqa; Hanjra,   Munir A.; Marikar,   Fuard; van der Hoek,   Wim.
Tipo: Working or Discussion Paper
Palavras-chave: Waste waters; Water quality; Flow; Water reuse; Recycling; Irrigation water; Public health; Crop production; Salinity; Soil properties; Groundwater; Ecology; Social impact; Economic impact; Cost benefit analysis; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Health Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2002
URL: http://purl.umn.edu/92696

Water-resource and land-use issues
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Calder,   Ian R.
This paper reviews perceived notions of the relationships between catchment land use and hydrology and explores whether much of the widely disseminated folklore, so often inextricably linked with issues of land use, is based on myth or reality. Gaps in our knowledge of the underlying processes in relation to land use and hydrology are identified. Our ability to apply this knowledge at different scales ranging from the plot to the catchment and regional scales are discussed and specific examples are drawn from Indian and African case studies. Methods for linking spatially distributed land-use hydrological models with economics and ecology through decision support systems are outlined and proposed as a framework for the integrated management of land and...
Tipo: Book
Palavras-chave: Water resource management; Water use; Case studies; Catchment areas; Land use; Hydrology; Models; Evaporation; Soil moisture; Decision support tools; Runoff; Flow; Forestry; Deforestation; Erosion; Rain; Environmental Economics and Policy; Land Economics/Use.
Ano: 1998
URL: http://purl.umn.edu/113610

Impact of changes in land use in the flow of the Pará River Basin, MG
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Rodrigues,Evandro L.; Elmiro,Marcos A. T.; Braga,Francisco de A.; Jacobi,Claudia M.; Rossi,Rafael D.
Plant cover plays an essential role in the maintenance and balance of the hydrological cycle, performing functions in the control of water availability, which guarantee flow permanence. The use of mathematical models is an alternative to represent the hydrological system and help in the understanding of phenomena involving the variables of the water cycle, in order to anticipate and predict impacts from potential changes in land use. In the present study, the hydrological model SWAT (Soil and Water Assessment Tool) was used to analyse the dynamics of flow and water flow in the Pará River Basin, Minas Gerais, Brazil, aiming to evaluate the impact caused by changes in land use in water availability. The adjusted model was assessed by the coefficient of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 'Cerrado'; Seasonal semideciduous forest; Flow.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100070

Simulation and validation of the ruminal digestion of carbohydrates in cattle from kinetic parameters obtained by in vitro gas production technique
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Silva Cabral,Luciano da; Campos Valadares Filho,Sebastião de; Detmann,Edenio; Zervoudakis,Joanis Tilemahos; Galati,Rosemary Lais; Paula Sousa,Daniel de; Souza,Alexandre Lima de.
This study aimed to validate the estimates of the ruminal degradation of total carbohydrates (TC), ruminal and total digestion of fibrous carbohydrates (FC) and microbial nitrogen flow in the abomasum evaluated by in vitro gas production technique (IVGP). Six ruminally and abomasally cannulated steers arranged in a double 3 × 3 latin square were used to measure described parameters with indigestible neutral detergent fiber (INDF) utilization as marker. Total and fibrous carbohydrates degraded in the rumen were estimated through digestion rates obtained for fibrous (FC) and non fibrous carbohydrates (NFC) using in vitro gas production technique, corrected for its respective ruminal and postruminal passage rates. The estimation of the total digestion of FC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Fiber; Flow; Microbial nitrogen; Passage rate.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000900020

Reactivity of the isolated perfused rat tail vascular bed
Provedor de dados: Brazilian Journal of Medical and Biological Research
Isolated segments of the perfused rat tail artery display a high basal tone when compared to other isolated arteries such as the mesenteric and are suitable for the assay of vasopressor agents. However, the perfusion of this artery in the entire tail has not yet been used for functional studies. The main purpose of the present study was to identify some aspects of the vascular reactivity of the rat tail vascular bed and validate this method to measure vascular reactivity. The tail severed from the body was perfused with Krebs solution containing different Ca2+ concentrations at different flow rates. Rats were anesthetized with sodium pentobarbital (65 mg/kg) and heparinized (500 U). The tail artery was dissected near the tail insertion, cannulated and...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Rat tail vascular bed; Phenylephrine; Calcium; Flow; Endothelium; Vascular tone; Perfusion pressure.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000700012