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Search Results: 1 - 10 of 192177 matches for " Pedro Vieira de Azevedo "
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Indexes of trends of changes climatic in the Bahia State
Gildarte Barbosa Silva,Pedro Vieira de Azevedo
Engenharia Ambiental : Pesquisa e Tecnologia , 2008,
Abstract: This work had as objective to investigate the occurrence or absence of climatic changes in the period of 1970 the 2006, in some microregions of the state of the Bahia: Irecê, Oeste, Sudoeste and Baixo Médio S o Francisco, through indexes of trends of climatic changes with data of daily total precipitation and the daily temperatures maximum and minimum of the climatological stations of the respective regions. One used the indexes of detection of climatic changes suggested by (World Meteorological Organization WMO) calculated from the data of daily precipitation and the daily temperature through software RClimdex 1.9.0. It was observed that in the region of Irecê it had trend of reduction of the annual total precipitation and increase in the intensity of daily rains. In the region Oeste it had increase in the number of days with raised temperatures, increase in the daily minimum temperatures and increase in the intensity of rains. In the Sudeste region it had a trend of a small increase of the annual rain totals. In the region of the Baixo Médio S o Francisco it had increase the number of days with daily maximum temperature, reduction of daily rains and the annual total precipitation. This variation in the precipitation in the region can be attributed to the circulation of great scale, while the intensity of rains can have influence in the climatic variability.
Preliminary analysis of detection of trends in pattern of temperatures Recife-PE: variability or climate change?
Wer?nica Meira de Souza,Pedro Vieira de Azevedo
Engenharia Ambiental : Pesquisa e Tecnologia , 2009,
Abstract: The IPCC projections show changes in pattern of temperatures and rainfall and greater frequency of extreme events. Despite these disclosures, some skeptical scientists believe that the planet temperature is undergoing cyclical and natural changes, sometimes going heating some others going cooling. According to these concerns, there are many doubts and uncertainties related to climate change and its consequences, and that all events related to the actual weather and climate changes should not always be related to global warming. The objective of this work was to detect trends in pattern of maximum and minimum air temperatures for the period from 1961 to 2008, at Recife-PE, Brazil, through the RClimdex (2.9.0) software, with the purpose of giving support to studies of uncertainties surrounding the management of the climate change. The results showed an increase in maximum and minimum air temperature with the development of heat waves in the study region. Based in these results it is possible to conclude that the study area is becoming warmer with tendency more to climatic change than climatic variability. However, it is not possible to say that these observed climatic indexes tendencies are only related to global climatic changes, once the contribution of several local factors may have modified the regional climate. For instance, the substitution of vegetated areas by asphalt, industries, among others surface covering elements may contributed to the formation of heat waves and altered the local climate.
Risco climático para o cultivo do algodoeiro na regi?o nordeste do Brasil
Azevedo, Pedro Vieira de;Silva, Fabrício Daniel dos Santos;
Revista Brasileira de Meteorologia , 2007, DOI: 10.1590/S0102-77862007000300012
Abstract: weekly mean values of solar radiation, rainfall, evapotranspiration and air temperature were used for establishing the lower climatic risk to the cotton crop. for irrigated fields, the potential crop yield was evaluated by the cumulative growth index (cgi), while for rain-fed conditions the climatic risk was determined by the water potential deficit (wpd). under irrigated and rain-fed conditions, the lower climatic risk occurs when cotton crop is sowing from 6 to 19 august and from the 44th (west region of bahia state) to the 19th week of the year. from the 1st week of the year, the most suitable date for cotton sowing start in the central region of piauí state, reaching maximum covering area of piauí, rio grande do norte, paraíba, pernambuco states and north of bahia state in the period between the 4th and the 8th week. in the south and west regions of bahia state, the lower climatic risk is reached by cotton crop when sowing in the 10th and 46th weeks. in the northeast coast, otherwise the cotton crop sowing is more suitable in the period from the 14th to 17th week, covering most of the coastal shore table lands from rio grande do norte to bahia states and almost the total areas of the alagoas and sergipe states.
Estimativa da erosividade das chuvas na bacia do riacho Namorado, no município de S o Jo o do Cariri (PB) / Estimation of rainfall erosivity in Namorado Creek watershed, in the municipality of S o Jo o do Cariri (PB)
Telma Lucia Bezerra Alves,Pedro Vieira de Azevedo
Ambiência , 2013,
Abstract: Foi inventariado um fragmento de Floresta Ombrófila Mista Montana, pouco erosividade da chuva é o termo da Equa o Universal da Perda de Solo que expressa a capacidade erosiva da precipita o pela desagrega o, por impacto, das partículas da superfície do solo, conduzindo à sua degrada o. Considerando a importancia deste fator no desencadeamento do processo erosivo, o presente estudo objetivou estimar o grau de erosividade da bacia hidrográfica do riacho Namorado, no município de S o Jo o do Cariri (PB). O método empregado para estimar a erosividade da chuva baseou-se nas equa es descritas na literatura especializada, com ajustamento para as condi es locais da equa o básica que relaciona a altura da chuva mensal e anual. Os resultados indicaram uma erosividade média anual de 78,07 MJ mm ha-1 h-1 ano-1 que, de acordo com a convers o realizada, corresponde a uma perda de solo de 7,95 tm mm ha-1 h ano-1. O índice de erosividade apresenta-se altamente correlacionado com o coeficiente de precipita o (R2 = 0,93), permitindo um bom ajustamento da equa o para o cálculo do índice de eros o, com maiores valores da erosividade nos meses de fevereiro, mar o e abril, os quais coincidem com o trimestre mais chuvoso.
Global warming impacts on the soybean climatic risk zoning in Tocantins State, Brazil
Girlene Figueiredo Maciel,Pedro Vieira de Azevedo,Aderson Soares de Andrade Júnior
Engenharia Ambiental : Pesquisa e Tecnologia , 2009,
Abstract: The main objective of this work is to analyze the possible impacts on areas considered favorable for soybean cultivation in the state of Tocantins, for the current scenarios and under the expected climatic changes deriving from global warming for soils of type 1 (sandy texture), type 2 (medium texture) and type 3 (loamy texture). The simulations of the decennial climatic water balances were obtained by using the software SARRAZON. An increase of 1.8oC in the mean temperature (scenario B1 - IPCC (2007)) was considered for such purpose, as well as a precipitation decrease of 10%. The results showed that for type 1 soils (low water availability), the favorable areas (low climatic risk) decreased from 268,719.98 km2 to 33,550.19 km2 for a sowing indication of November 15, representing a reduction of 88%. For soils of types 2 and 3, considering the indication of the same sowing date, the reduction percentages were 8.1% and 5.5%, respectively.
Bower ratio-energy balance associated errors in vineyards under dripping irrigation
Soares, José Monteiro;Azevedo, Pedro Vieira De;Silva, Bernado Barbosa Da;
Revista Brasileira de Meteorologia , 2007, DOI: 10.1590/S0102-77862007000200008
Abstract: this study was conducted at the bebedouro experimental station in petrolina-pe, brazil, to evaluate the errors associated to the application of the bowen ratio-energy balance in a 3-years old vineyard (vitis vinifera, l), grown in a trellis system, irrigated by dripping. the field measurements were taken during fruiting cycle (july to november, 2001), which was divided into eigth phenological stages. a micrometeorological tower was mounted in a grape-plants row in which sensors of net radiation, global solar radiation and wind speed were installed at about 1.0 m above the canopy. also in the tower, two psicometers were installed at two levels (0.5 and 1.8 m) above the vineyard canopy. two soil heat flux plates were buried at 0.02 m beneath the soil surface. all these sensors were connected to a data logger 21 x of campbell scientific inc., programmed for collecting data once every 5 seconds and storage averages for every 15 minutes. a comparative analysis were made among four bowen ratio accepting/rejecting rules, according to the methodology proposed by spano et al. (2000): br1 - values of b calculated by bowen (1926) equation; br2 - values of b as proposed by verma et al. (1978) equation; br3 - exclusion of the b values obtained as recommended by unland et al. (1996) and br4 - exclusion of the b values calculated as proposed by bowen (1926), out of the interval (-0.7 < b < 0.7). constacted that the unland et al. (1996) and soares (2003) accepting/rejection rules were better than that of verma et al. (1978) for attenuating the advective effects on the calculations of the bowen ratio. the comparison of br1 with br2 rules showed that the statistical errors reaching maximum values of 0.015. when comparing br1 with br3 e br4, the b errors reaching maximum values of 5.80 and 3.15, respectively.
Exigências hídricas da videira na Regi o do Submédio S o Francisco
Pesquisa Agropecuária Brasileira , 2000,
Abstract: O trabalho objetivou a estimativa das necessidades hídricas da videira (Vitis vinifera L.), cv. Itália, sob as condi es edafoclimáticas da Regi o do Submédio S o Francisco. A parte experimental foi conduzida no campo experimental de Bebedouro da Embrapa-Centro de Pesquisa Agropecuária do Trópico Semi-árido, no município de Petrolina, PE, durante o período de maio a agosto de 1996. A evapotranspira o da cultura foi determinada pelo método do balan o hídrico no solo, e a evapotranspira o de referência foi estimada pelo método de Penman, visando avaliar o comportamento do coeficiente de cultura (Kc) ao longo do ciclo da cultura. O parreiral, com cinco anos de idade, foi conduzido em sistema de latada a 2 m acima da superfície do solo, num espa amento de 4 m x 2 m e irrigado diariamente por gotejamento. O consumo hídrico diário máximo da cultura foi de 4,33 mm dia-1, totalizando 333,6 mm no período de observa es. Os valores de Kc variaram de 0,50 a 0,74. Determinou-se uma curva característica de Kc para o ciclo vegetativo da videira, a qual permite obter o Kc diário em fun o dos dias após a poda.
Exigências hídricas da videira na Regi?o do Submédio S?o Francisco
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000800008
Abstract: this study used data of a field experiment conducted at the bebedouro experimental base of the embrapa-centro de pesquisa agropecuária do trópico semi-árido in petrolina, pe, brazil, from may to august, 1996, during the growing period of a five-year-old table grape (vitis vinifera l.), italy cultivar. the plants were conducted in a two-meter above soil surface trellis system, four meters between rows by two meters between plants, and daily irrigated by trickling system. the crop evapotranspiration was determined by the soil water balance method, and the reference evapotranspiration was estimated by the method of penman, used to analyse the behaviour of the crop coefficient (kc) throughout the crop growing period. the maximum crop daily water use was 4.33 mm d-1 and the total water consumption was 333.6 mm for the whole growing period. the crop coefficient values varied from 0.50 to 0.74. a characteristic curve of kc for the table grape vegetative cycle was obtained which allows to obtain daily values of kc as a function of days after pruning.
Fluxos de CO2 do solo na floresta nacional de Caxiuan , Pará, durante o experimento ESECAFLOR/LBA Soil CO2 efflux in Caxiuan national forest, Pará, during the ESECAFLOR/LBA experiment
Jo?o de Athaydes Silva Júnior,Antonio Carlos L?la da Costa,Pedro Vieira de Azevedo,Rafael Ferreira da Costa
Revista Brasileira de Meteorologia , 2013,
Abstract: O experimento ESECAFLOR/LBA foi conduzido na Floresta Nacional de Caxiuan , Pará, e este artigo procura investigar os efeitos do estresse hídrico sobre a respira o do solo. Duas parcelas de 1 hectare foram instaladas em janeiro de 2002. Uma parcela (A) permaneceu em condi es naturais e foi usada como controle, enquanto que na parcela de exclus o (B) foram instalados painéis plásticos para que aproximadamente 70% da precipita o fosse excluída. Os dados foram coletados mensalmente de janeiro a dezembro de 2005. Durante o ano de 2005 houve 2.211,6 mm de precipita o na ECFPn, ou seja 9,96% acima da média de 2.011,2 mm. As médias da umidade do solo foram de 15,6±9,2 e 9,5±3,4% nas parcelas A e B, respectivamente. As médias da temperatura do solo para as parcelas A e B foram de 25,6±0,4 e 25,7±0,5 oC, respectivamente. As médias dos fluxos de CO2 no solo nas parcelas A e B foram de 3,46±0,44 e 3,21±0,84 μmolCO2 m-2s-1, respectivamente. Com a exclus o de parte da chuva na parcela B, houve uma redu o de 7,23% nos fluxos de CO2 no solo (0,25 μmolCO2 m-2s-1), 39,1% na umidade do solo (6,1p.p.), e um aumento de 0,39% na temperatura do solo (0,1oC). A umidade do solo na parcela B foi menor do que na parcela A, devido ao sistema de exclus o da chuva, no entanto no início do ano, devido a reformas que o mesmo passou esses valores estiveram próximos. The ESECAFLOR/LBA experiment was carried out at the Caxiuan National Forest, Pará State, and this article intends to investigate the effect of hydrological stress on the total soil respiration. Two adjacent 1 hectare plots were defined in January 2002. One plot remained in its natural conditions and was used as a control (A), while in the exclusion plot (B) plastic cover panels were installed in order to drain about 70% of the total rainfall to outside of the plot. Accumulated monthly rainfall was recorded from 2005 January to December. During 2005 the rainfall over the ECFPn was 2,211.6 mm, or 9.96% above the mean of 2,011.2 mm. The average soil moisture was 15.6±9.2 and 9.5±3.4% in the plots A and B, respectively. The average soil temperature was 25.6±0.4 and 25.7±0.5 oC, for the A and B plots, respectively. The average soil CO2 flux was 3.46±0.44 and 3.21±0.84 μmolCO2 m-2s-1 in the A and B plots, respectively. With the exclusion of part of rain in plot B, it had a reduction of 7.23% in the soil CO2 flux (0.25 μmolCO2 m-2s-1), 39.1% in the soil humidity (6.1p.p.), and an increase of 0.39% in the soil temperature (0.1oC). The soil moisture in parcel B was lesser than in the parcel A, due to the exclusion system of r
Estudo de crian?as com síndrome do desconforto respiratório agudo: correla??o anatomoclínica radiológica
Azevedo, Zina Maria Almeida de;Outani, Heloísa Novaes;Monteiro, Alexandra Maria Vieira;Boechat, Márcia Cristina Bastos;Elsas, Pedro Paulo Xavier;
Revista da Sociedade Brasileira de Medicina Tropical , 1999, DOI: 10.1590/S0037-86821999000500014
Abstract: this retrospective study reviews cases of ards (adult respiratory distress syndrome) treated and followed up from october 1988 to december 1990 in the pediatric intensive care unit of instituto fernandes figueira/fiocruz, brazil. clinical, radiological and histopathological features were analyzed and correlated with well defined stages of the disease process. out of 459 cases, 49 (11%) were selected for further study. in 11 cases, histopathological examination (4 biopsies and 8 autopsies) was performed and then classified into one of the following phases: exsudative, cellular proliferative and late fibrotic. the work emphasizes the need for further clinical and experimental studies in order to define the mechanisms and the impact of this syndrome in the pediatric population.
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