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Search Results: 1 - 10 of 631692 matches for " E. M. L. M. Novo "
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Inside the hydro-physics processes at the plunge point location: an analysis by satellite and in situ data
A. T. Assireu,E. Alcantara,E. M. L. M. Novo,F. Roland
Hydrology and Earth System Sciences Discussions , 2011, DOI: 10.5194/hessd-8-1193-2011
Abstract: The plunge point locates the main point of mixing between river and the epilimnion reservoir water. The plunge point monitoring is essential to understand how it will be the behavior of density currents and its implications for reservoir. The applicability of satellite imagery products from different sensors (Landsat TM band 6 thermal signatures and visible channel) for characterization of the river-reservoir transition zone is presented in this study. We demonstrate the feasibility of the Landsat TM band imagery to discern the subsurface river plumes and the plunge point. The spatial variability of the plunge point evident in the hydrologic data illustrates the advantages of synoptic satellite measurements over in situ point measurements alone to detect the river-reservoir transition zone. It is indicated that the river flowing as underflow contributes to the thermal stability of the water column during wet season (summer-autumn). During the dry season, when the river-reservoir water temperature differences vanish and the river circulation is characterized by interflow-overflow, the river water inserts into the reservoir upper layers, affecting water quality. The results indicate good agreement between hydrologic and satellite data and that the jointly use of thermal and visible channel, operational monitoring of plunge point is feasible. The deduced information about the density current from this product could potentially be assimilated for numerical modeling and hence be of significant interest for environmental and climatological research.
A water level relationship between consecutive gauge stations along Solim?es/Amazonas main channel: a wavelet approach
R. D. Somoza,E. S. Pereira,E. M. L. Novo,C. D. Rennó
Physics , 2013, DOI: 10.2495/WS130051
Abstract: Gauge stations are distributed along the Solim\~oes/Amazonas main channel to monitor water level changes over time. Those measurements help quantify both the water movement and its variability from one gauge station to the next downstream. The objective of this study is to detect changes in the water level relationship between consecutive gauge stations along the Solim\~oes/Amazonas main channel, since 1980. To carry out the analyses, data spanning from 1980 to 2010 from three consecutive gauges (Tefe, Manaus and Obidos) were used to compute standardized daily anomalies. In particular for infra-annual periods it was possible to detect changes for the water level variability along the Solim\~oes/Amazonas main channel, by applying the Morlet Wavelet Transformation (WT) and Wavelet Cross Coherence (WCC) methods. It was possible to quantify the waves amplitude for the WT infra-annual scaled-period and were quite similar to the three gauge stations denoting that the water level variability are related to the same hydrological forcing functions. Changes in the WCC was detected for the Manaus-Obidos river stretch and this characteristic might be associated with land cover changes in the floodplains. The next steps of this research, will be to test this hypotheses by integrating land cover changes into the floodplain with hydrological modelling simulations throughout the time-series.
Photo- and electroluminescent behavior of Eu3+ ions in blends with poly(vinyl-carbazole)
Deichmann, V.A.F.;Novo, J.B.M.;Cirpan, A.;Karasz, F. E.;Akcelrud, L.;
Journal of the Brazilian Chemical Society , 2007, DOI: 10.1590/S0103-50532007000200013
Abstract: the complex tris(thenoyltrifluoracetonate)(2,2'-bipyridine)europium(iii), eu(tta)3bipy, was synthesized and assessed for luminescence behavior. the emission of its blends with poly(9-vinyl carbazole) (pvk-eu), varying in composition from 1 to 8% (eu(tta)3bipy/pvk, m/m) showed pl at 425 nm and at 613 nm, with intensities which depended on the blend composition. double-layer led devices with configuration ito/pedot-pss/blend/ca-al emitted red light with turn-on voltages of 9 v and emission maxima at 617 nm; its luminance efficiency was 0.04 cd a-1. time resolved measurements indicated that the microstructure of the matrix had practically no effect on the electro-optical properties of the blends.
Hydro-physical processes at the plunge point: an analysis using satellite and in situ data
A. T. Assireu, E. Alcantara, E. M. L. M. Novo, F. Roland, F. S. Pacheco, J. L. Stech,J. A. Lorenzzetti
Hydrology and Earth System Sciences (HESS) & Discussions (HESSD) , 2011,
Abstract: The plunge point is the main mixing point between river and epilimnetic reservoir water. Plunge point monitoring is essential for understanding the behavior of density currents and their implications for reservoir. The use of satellite imagery products from different sensors (Landsat TM band 6 thermal signatures and visible channels) for the characterization of the river-reservoir transition zone is presented in this study. It is demonstrated the feasibility of using Landsat TM band imagery to discern the subsurface river plumes and the plunge point. The spatial variability of the plunge point evident in the hydrologic data illustrates the advantages of synoptic satellite measurements over in situ point measurements alone to detect the river-reservoir transition zone. During the dry season, when the river-reservoir water temperature differences vanish and the river circulation is characterized by interflow-overflow, the river water inserts into the upper layers of the reservoir, affecting water quality. The results indicate a good agreement between hydrologic and satellite data and that the joint use of thermal and visible channel data for the operational monitoring of a plunge point is feasible. The deduced information about the density current from this study could potentially be assimilated into numerical models and hence be of significant interest for environmental and climatological research.
Produ??o de mudas de alface em bandejas e substratos comerciais
Trani, Paulo E.;Novo, Maria do Carmo S.S.;Cavallaro Júnior, Mário L.;Telles, Luciana M.G.;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000200025
Abstract: the effect of four commercial substrates in polystyrene trays with 200 and 288 cells, was evaluated on the production of seedlings of lettuce (lactuca sativa cv. vera) in a plastic greenhouse, from 15/01 to 13/02/03, in campinas, s?o paulo state, brazil. the treatments consisted of factorial combinations of four commercial substrates (plantmax ha, hortimix folhosas, golden mix 47 and, vida verde tropstrato hortali?as) and two cell sizes (200 and 288 cells). the experimental design was a randomized complete design, with the plots split with each part subdivided for the evalution time, with three repetitions, each beign made up of a tray. at 5; 10; 15 and 20 days after germination, twenty random plants from each plot were evaluated for their stem height, number of leaves, clod stability of substrate and foliar area. fifteen and twenty days after germination, the lettuce seedlings grown in plantmax presented better development characteristics than other substrates. seedlings produced on trays with 200 cells presented greater number of leaves and bigger leaf areas than those produced on 288 cells trays.
Satellite Images Applied to Assess the Influence of Amazon River Seasonal Dynamic on the Floodplain Lake Morphology  [PDF]
Andreia M. S. Fran?a, Teresa G. Florenzano, Evlyn M. L. M. Novo
Open Journal of Ecology (OJE) , 2014, DOI: 10.4236/oje.2014.413070
Abstract: The objective of this study is to assess the influence of the Amazon River seasonal dynamic on floodplain lake morphology. The study area includes the Amazon River floodplain reach encompassed by the Madeira and Tapajós River confluences. Products from the Global Rain Forest Mapping (GRFM) and Moderate Resolution Imaging Spectroradiometer (MODIS) were used to derive variables such as lake size, shape and number. The main steps in the research were: data base implementation, legend definition, image processing (merge, segmentation, classification and edition), morphological mapping and quantitative assessment. Four classes of lacustrine morphology were defined in this study: circular/elliptical, elongated, composite, and dendritic. The result showed that 1) the lake class increased 18.38% from the low- to high-water period; 2) there was a reduction in the total number of lakes from low to high water; 3) the most common lake type was the circular/elliptical; and 4) better results were obtained integrating SAR and optical sensors.
Otolicuorrea espontánea en el adulto: Presentación de dos casos y revisión de la literatura
Galbarriatu,L.; Aurrecoechea,J.; Ruiz de Gopegui,E.; Pomposo,I.; Bilbao,G.; González,S.; Undabeitia,J.I.; Novo,J.J.; Aguirrebengoa,K.; Garibi,J.M.;
Neurocirugía , 2011, DOI: 10.4321/S1130-14732011000200006
Abstract: introduction. spontaneous cerebrospinal fluid otorrhea is a relatively rare entity and can be easily missed in adults. every adult older than 50 years with a negative history of otologic disease who has recurrent serous otitis media should be evaluated for this pathology. meningitis is the most serious complication, so there is no doubt that the condition needs immediate attention and correction. objective. we present two patients who were diagnosed with spontaneous csf otorrhea and make a review of what is reported about this topic. conclusion. surgical repair is mandatory to seal these nontraumatic csf leaks. there are two main surgical approaches, the middle fossa craniotomy and the transmastoid approach. a multilayered closure technique in which autologous and artificial materials are combined is considered to result in the highest rate of success.
AVALIA O ESPA O-TEMPORAL DA RELA O ENTRE O ESTADO TRóFICO DO RESERVATóRIO DE BARRA BONITA (SP) E O POTENCIAL POLUIDOR DE SUA BACIA HIDROGRáFICA / Assessment of the space-time relationships between the UHE Barra Bonita Trophic State and its drainage basin pollution potential
Rachel Bardy Prado,Evlyn M.L. M Novo
Revista Sociedade & Natureza , 2007,
Abstract: This research aimed to understand the fast water degradation process in overpopulated áreasas a result of inadequate land use and land cover practices. Therefore, the objetive of thisstudy is to assess the relationship between the trophic state of the Barra Bonita Reservoir(SP)and the pollution potential of its drainage basin in space and time. The trophic statedetermination was based in water samples collected at 32 stations evenly distributed in thelake in two dates: 1990 and 2002. These samples were used to determine the key parametersfor the computation of the Trophic State Index (TSI), which was then spatialised with aid of theESRI ArcView 3.2 sofware. The pollution potential was based on several data: land use andland cover maps derived from the Landsat /Thematic Mapper images acquired in 1990 and2002; population growth and nitrogen and phosphor load. The results showed the increase inthe water trophic level from 1990 to 2002, but this increase was not homogenous. The waterquality degradation, as expressed by the TSI was highest in Tietê river compartment due toresponse to the higher pollution potential of S o Paulo city. The space and time integratedanalyses of the terrestrial and aquatic system allowed to conclude that the water qualitydegradation is closely connected to both land use and land cover changes in the drainagebasin and to the population growth. Other important finding was that the pollution potentialis not homogenous throughout the drainage basin, and that therefore, the pollution controlpolice must be focused in more critical areas, where the degradation is more intense.
Análise derivativa de dados hiperespectrais medidos em nível de campo e orbital para caracterizar a composi??o de águas opticamente complexas na Amaz?nia
Rudorff, Conrado M.;Novo, Evlyn M. L. M.;Galv?o, Lênio S.;Pereira Filho, Waterloo;
Acta Amazonica , 2007, DOI: 10.1590/S0044-59672007000200014
Abstract: derivative analysis of spectral data was used as a technique to study the variation of optically active constituents (oacs) of water, using field data and hyperspectral imagery of eo-1 hyperion orbital sensor. the hyperion image used in this study was acquired on june 23, 2005, at the end of the high water period for the amazon river. a field campaign was carried out between june 23 and 29, 2005 to collect spectral and limnological in situ data. the image was pre-processed to remove stripes of abnormal pixels and converted from radiance to surface reflectance values, thus, correcting the effects of atmospheric absorption and scattering. a correlation analysis was carried out to examine the association of the spectral reflectance and its first derivative to the concentrations of oacs. better results were obtained after spectra differentiation, which helped to reduce the influence of undesirable effects, coming from different sources of radiance, on the measurements of water surface reflectance taken at both data acquisition levels. through empirical regression fits, considering the hyperion dataset, the first spectral derivative at 711 nm explained 86% of the variation of suspended inorganic sediment concentration (μg.l-1), and the first derivative at 691 nm explained 73% of the variation of chlorophyll-a concentration (μg.l-1). the regression relations were nonlinear because, generally, the water masses that mix in the amazon floodplain become optically complex. the hyperspectral derivative analysis demonstrated potential for mapping the composition of these waters.
Environmental factors associated with long-term changes in chlorophyll-a concentration in the Amazon floodplain
E. Alcantara,E. M. Novo,C. F. Barbosa,M.-P. Bonnet
Biogeosciences Discussions , 2011, DOI: 10.5194/bgd-8-3739-2011
Abstract: Long-term environmental time series of continuously collected data are fundamental to identify and classify pulses and determine their role in aquatic systems. This paper presents in situ daily mean chlorophyll-a concentration time series, key information for the current understanding of carbon fluxes in and out of the Amazonian floodplain system. This paper also investigates how seasonal fluctuations in water level affect the relationship between chlorophyll-a concentration and some of its controlling limnological (water level, water surface temperature, pH and turbidity) and meteorological (wind intensity, relative humidity and short wave radiation) variables provided by an automatic monitoring system (Integrated System for Environmental Monitoring-SIMA) deployed at Curai Lake. The data are collected in preprogrammed time interval (1 h) and are transmitted by satellite in quasi-real time for any user in a range of 2500 km from the acquisition point. We used Pearson correlation to determine the quantitative relationship between chlorophyll-a time series and others environmental parameters. Fourier power spectrum analyses were applied to identify periods of high variability in chlorophyll-a time series and wavelet power spectrum analyses helped to characterize their time-frequency structure. To further investigate the relationship between chlorophyll-a and the statistically significant variable highlighted by Pearson's correlation, the set of time series was submitted to cross wavelet analysis. The time series of chlorophyll-a shows two high peaks (47 μg L 1 and 53.30 μg L 1) of concentration during a year: first during the rising water and second during the low water level. A small peak was observed during the high water level (10 μg L 1). For the most part of rising, high and receding water level, the chlorophyll-a concentration is often low (from 2.20 μg L 1 to 9.10 μg L 1). chlorophyll-a concentration displays periodicities ranging from 2–60 days, with a coherence of approximately 1 in phase with water level during the rising and low water period. Water level dynamics and turbidity explain 68% of the chlorophyll-a time series variability.
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