oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 57 )

2018 ( 378 )

2017 ( 389 )

2016 ( 441 )

Custom range...

Search Results: 1 - 10 of 227661 matches for " José de Souza Nogueira "
All listed articles are free for downloading (OA Articles)
Page 1 /227661
Display every page Item
Effects of Sky Conditions Measured by the Clearness Index on the Estimation of Solar Radiation Using a Digital Elevation Model  [PDF]
Marcelo de Carvalho Alves, Luciana Sanches, José de Souza Nogueira, Vanessa Augusto Mattos Silva
Atmospheric and Climate Sciences (ACS) , 2013, DOI: 10.4236/acs.2013.34064
Abstract:

This study evaluated the effects of sky conditions (measured by the clearness index, KT) on the estimation of solar radiation and its components. Solar radiation was calculated by a digital elevation model derived from the Shuttle Radar Topography Mission (SRTM). The calculated radiation was parameterized and validated with measured solar radiation from two stations inside the urban perimeter of the city of Cuiabá, Brazil, during 2006 to 2008. The measured solar radiation varied seasonally, with the highest values in December-March and the lowest in June-September. Comparisons between calculated and measured values for two sites in Cuiabá demonstrate that the model is accurate for daily Rg estimates under clear sky conditions based on Root Mean Square Error, Mean Bias Error and Willmott’s index. However, under partially cloudy and cloudy sky conditions the model was not able to provide robust estimates. Spatially, the highest values of incident Rg occurred on strands with North, Northeast and Northwest orientations and were lowest on those oriented to the South, Southeast and Southwest.

Interannual Variability of Energy Flux in Atmospheric Instability Conditions at Pantanal of Mato Grosso-Brazil  [PDF]
Leone Francisco Amorim Curado, José de Souza Nogueira, Luciana Sanches, Marcelo Sacardis Biudes, Thiago Rangel Rodrigues
Atmospheric and Climate Sciences (ACS) , 2012, DOI: 10.4236/acs.2012.24046
Abstract: The energy balance partitions in wetlands have gained notoriety due to the dynamics and importance of these areas for regional and local climate. Thus, the study was conducted about seasonal and interannual behavior energy fluxes, as well as the influences of the conditions of atmospheric stability and instability. The results showed highest fluxes happened in instability atmospheric conditions. The fluxes of latent and sensible heat showed seasonal variation, indicating that the water availability in the atmosphere has influence on the site energy partition, but the interannual patterns remained similar during the two years of study.
GEOGRAFIA E QUEST O AMBIENTAL NO ESTUDO DE PAISAGENS DE EXCE O: O EXEMPLO DA SERRA DE BATURITé – CEARá
Luciana Martins Freire,Marcos José Nogueira de Souza
Boletim Goiano de Geografia , 2006,
Abstract: A Serra de Baturité é uma paisagem de exce o resultantedo comportamento de um ambiente diferenciado, ondea altitude do relevo condiciona a existência de condi esclimáticas que potencializam favoravelmente a ocorrênciade um enclave de mata úmida em meio ao semi-árido.Porém, o uso desordenado dos recursos naturais propicioua cria o de uma área de Prote o Ambiental na décadade 1990. Mesmo com a cria o da APA da Serra deBaturité, a área enfrenta problemas ambientais no que dizrespeito às condi es de uso e ocupa o da terra. A presen ade atividades agrícolas em vertentes muito íngremesvem se processando rotineiramente, ocasionando adevasta o da cobertura vegetal, promovendo a exposi odos solos e o afloramento de rochas, comprometendoassim a qualidade ambiental. Outro problema apontado éa especula o imobiliária, consumado pela valoriza o daterra na Serra de Baturité, consolidada como regi o desegunda residência e propícia para atividades turísticas.A pesquisa desenvolve-se a partir de estudo integrativoda natureza, com base na concep o geossistêmica, avaliandoo estado atual de conserva o dos recursos naturaise propondo subsídios para o planejamento de uso eocupa o da terra em bases sustentáveis.
ALIMENTA O DE GIRINOS DE R -TOURO COM DIFERENTES NíVEIS DE PROTEíNA BRUTA
JOSé TEIXEIRA DE SEIXAS FILHO,RODRIGO DIANA NAVARRO,LILIAN NOGUEIRA DA SILVA,LUIZA NOGUEIRA DE SOUZA
Ciência Animal Brasileira , 2011,
Abstract: This study aimed at evaluating the performance of bullfrog tadpoles fed three levels of protein. Tadpoles were divided into 1 2 white boxes of polyethylene (62.5 x 40 x 16 cm) with a 40L capacity, which received 30L of water, receiving 30 animals, with average weight andlength of 0.027 ± 0.009g and 4.91 ± 0.45mm, respectively, resulting in a density of 1 tadpole per liter. As for feeding, commercial diets were used with three levels of crude protein (CP), 22%, 24% and 28%, with a 0.5 mm diameter, administered at a rate of 1 0% of tadpoles weight distributed once a day at noon. The experimental design was completely randomized with four replications. The best percentage of survival, 94.87%, was found in the 22% CP group. The other groups, with 24% and 28% protein, showed 81 .17% and 86.50% of survival rate, respectively. These results showed that the rations were not sufficient to provide a complete performance to the animals. Similarities regarding crude protein were observed until the 1 5th dayamong all the groups studied. However, there are some special physiological necessities, especially in relation to the protein intake, that were not well fulfilled despite the animals′good performance showed in this period.
Inter Seasonality of the Energy Fluxes in Brazilian Savana—Mato Grosso—Brazil  [PDF]
Leone Francisco Amorim Curado, José de Souza Nogueira, Luciana Sanches, Thiago Rangel Rodrigues, Francisco de Almeida Lobo, Marcelo Sacardi Bíudes
Atmospheric and Climate Sciences (ACS) , 2014, DOI: 10.4236/acs.2014.42025
Abstract:

Dynamics of flows of matter and energy these biomes are relevant to understanding of environmental processes that govern the biosphere-atmosphere interactions and between ecosystems. This study analyzed inter season and season of energy fluxes in Brazilian Savana through Bowen Ration Method. Results show differences in patterns LE in all season, LE predominant in wet while H in dry. This inversion in patterns of predominant components of the energy balance in wet and dry season because in wet season increase water content in soil and atmosphere due precipitation in this season providing more lost energy for atmosphere in shape LE through soil evaporation and plant transpiration, this results in LE and H in all season of the Brazilian Savana show higher variation in dynamics energy fluxes between surface and atmosphere, as well as energy partition in this biome. Statistics analyses presents than many climate variables influences LE and H in each season indicating complexity in this fluxes. More study is necessary to higher understand patterns energies fluxes in Brazilian Savana.

ESTUDO DO MOMENTO óTIMO DE REFORMA PARA POVOAMENTOS DE Eucalyptus spp – O CASO DA REDU O DOS CUSTOS
álvaro Nogueira de Souza,Ant?nio Donizette de Oliveira,José Luiz Pereira de Rezende
Ciência Florestal , 2002,
Abstract: Os objetivos deste trabalho foram: a) propor e verificar a eficiência de um modelo matemático que permita estudar os efeitos do progresso tecnológico (redu o dos custos) sobre a época ótima de substituir povoamentos de Eucalyptus spp; b) determinar a rota o florestal de um povoamento de Eucalyptus spp; c) verificar qual seria o momento de substituir se as receitas estivessem constantes desde o início dos incentivos fiscais, ou seja, na década de 60, e, d) projetar o momento de substituir o povoamento no futuro, considerando os custos decrescentes e a produtividade constante a valores de hoje. Utilizou-se a Fun o Gompertz para o cálculo da produ o de madeira. O critério utilizado para a avalia o econ mica da viabilidade dos projetos foi o Valor Presente Líquido. O modelo proposto permitiu calcular o efeito do progresso tecnológico nos custos no período entre 1960 e 2000 e projetar os valores dos custos para o período entre 2000 e 2040. Concluiu-se que: a) a rota o, com valores atuais, encontra-se, em 7 anos, mantidas as receitas da década de 60; b) o momento ótimo de reforma estaria em seis cortes; c) o modelo mostrou-se eficiente para estimativas em um horizonte de até 40 anos; o estudo da cadeia de substitui o mostrou que as épocas ótimas de reforma caíram ao longo dos anos, de seis cortes na década de 60, três na década de 80 e dois atualmente; a tendência é permanecer nos dois cortes passando a três com um pequeno aumento na produtividade das talhadias.
THE OPTIMAL TIME FOR SUBSTITUTION OF Eucalyptus spp. PLANTATIONS –THE TECHNOLOGICAL PROGRESS CASE
José Luiz Pereira de Rezende,álvaro Nogueira de Souza,Ant?nio Donizete de Oliveira
CERNE , 2005,
Abstract: The importance of technological progress for the Brazilian forest enterprises cannot be denied. Its influencecomprehends all the activities, but can be summarized in the increase of income via yield increase or cost reduction and, mainly,in the two cases occurring together. Technological effects influence, among other aspects, the cutting age and the optimal time torenewal (a new plantinting or “reforma”) Eucalyptus plantations. Studies to determine these times are not so common in theliterature since it requires both forestry and economic knowledge. Before renewing an Eucalyptus stand, it is necessary totechnically and economically to define the optimal cut age the original planting and the coppicings and after how many cuttingsthe substitution of the plantations should be done. This study aimed at studying the optimal time to substitute Eucalyptus spp.Plantations, considering the gains earned through technological progress; to determine the cutting age of the population, theincome being increasing and the cost being decreasing; to propose and verify the efficiency of a mathematical model whichallows modeling the effects of technological progress; to study the substitution chain between 1960 and 2000 and between 2000and 2040, considering technological progress; and to test the results in a case study. The Gompertz Function was employed toobtain the volumes at the various ages. The criterion employed for the economic evaluation of the projects was the Presente NetValue (PNV). The proposed model allowed the calculation of yields and costs through time, study the effect of yield increaseand cost reduction and determine the rates of these increase and, or, reductions as well as determining rates which served asmoderators so that the yield and costs did not reach unreal values. It was concluded that: The rotation, with current values, is at 7years of age; the model proved to be efficient for estimates up to 40 years; with the income and costs from the sixties, consideringtechnological progress from that point on, the number of cuttings before the renewal is currently 2; the substitution chain showedthat the optimal substitution time went down with time, going from 18 cuttings in the sixties to 4 cuttings in the eighties,currently getting to 2 cuttings; a tendency to stick with 2 cuttings before substitution was verified for future cultivation, althoughlittle technological improvement in the coppice yield brings the optimal substitution Point to after the third cutting.
OPTIMAL TIME FOR SUBSTITUTION OF Eucalyptus spp POPULATIONS – THE CASE OF CONSTANT TECHNOLOGY
álvaro Nogueira de Souza1;,José Luiz Pereira de Rezende,Ant?nio Donizette de Oliveira
CERNE , 2001,
Abstract: The few studies on renewal of Eucalyptus spp populations done in Brazil consider constant technology. This is done this way for facilitating the modeling of how variables affect this activity, such as income, costs, rates of discount and yield. The reason for not considering the gains earned through technological progress is the lack of a specific dynamic model. This study was carried out aiming to get to know the forest rotation with values from the sixties (beginning of tax exemption programme) and current values (nineties) aiming to obtain wood for cellulose and charcoal production; to determine the moment of substitution of a population which presents the same yield and the same cost structure through time as well as to determine how many cuttings should be done until the final cycle; to determine how many cuttings should be done until substitution (substitution chain); to verify the sensitivity of the substitution time to variations in the discount rates, wood prices, yield, land costs, harvesting costs and coppice yield. The results were tested in a case study, employing the Gompertz Function to determine the population yield. The Current Net Value Method was used as a crieterion of economic decision. It has been concluded that: The forest rotation to produce charcoal in the sixties was at 13 years of age; the current rotation is at 7 years of age; the final cycle allows up to 13 cuttings, but considering the possibility of land leasing, the best alternative is to conduce the sproutings up to the third cutting; an increase in factors such as discount rates, wood prices and yield caused reduction of the cutting age; increase in land costs did not affect the cutting ages; increase in the logging cost increased the cutting ages; the substitution of population now a days happens after 3 cuttings, while in the sixties it happened after 2 cuttings due to the lesser loss; an increase in factors such as discount rates, wood prices, logging costs and coppice yield increased the number of cuttings before the substitution and increase in the yield caused reduction of the substitution age (number of cuttings).
Estudo da infec o e morbidade da doen a de Chagas no município de Jo o Costa: Parque Nacional Serra da Capivara, Piauí, Brasil
Borges-Pereira José,Castro José Adail Fonseca de,Campos José Henrique Furtado,Nogueira José de Souza
Revista da Sociedade Brasileira de Medicina Tropical , 2002,
Abstract: Com o objetivo de investigar aspectos da infec o e morbidade da doen a de Chagas no município de Jo o Costa, Piauí, Brasil, realizamos pesquisa sorológica para detectar Ig G anti-T. cruzi em 2.080 moradores através dos testes de imunofluorescência indireta, hemaglutina o indireta e ELISA. Em seguida, 189 pacientes soropositivos e 141 soronegativos foram avaliados pelo exame clínico e eletrocardiograma (ECG), enquanto a parasitemia foi pesquisada em 106 chagásicos pelo xenodiagnóstico indireto e teste da rea o polimerásica em cadeia (PCR). A soropositividade total para Ig G anti-T.cruzi foi de 9,8%, com varia o de 0,5% em menores de 10 anos a 39,4% em maiores de 59 anos, independentemente do sexo. O percentual de ECG alterados foi de 41,3% entre os chagásicos e de 15,6% entre os n o-chagásicos (p < 0,05). A positividade do teste da PCR foi de 74,5% e a do xenodiagnóstico de 15,1% (p < 0,05). Apesar da elevada prevalência da infec o na popula o investigada, o baixo valor nos menores de 10 anos pode ser indicador de redu o da transmiss o por triatomíneos. A alta propor o de participa o do componente etiológico exclusivamente chagásico na prevalência da cardiopatia indica a gravidade da doen a de Chagas na regi o estudada.
Estimativa do balan?o de energia em cambarazal e pastagem no norte do Pantanal pelo método da raz?o de Bowen
Biudes, Marcelo Sacardi;Campelo Júnior, José Holanda;Nogueira, José de Souza;Sanches, Luciana;
Revista Brasileira de Meteorologia , 2009, DOI: 10.1590/S0102-77862009000200003
Abstract: the energy balance study of a vegetated surface and atmosphere is important to characterize the local microclimate, identify interactions among environmental variables and the vegetation and to identify anthropogenic activities effects. the objective of this work was estimate the seasonality of energy balance by bowen ratio method in a monodominant vegetation of cambará area in the rppn sesc-pantanal and a pasture area in ufmt's experimental farm. the energy balance components presented seasonality, with larger averages at the rainy station in two areas of study. in the cambarazal was a higher variation of the latent heat flux of the dry season for the rainy season that in the pasture. however, the seasonal variation of the sensible heat flux in the cambarazal was lower than in the pasture, due to the thermo-regulatory effect in the cambarazal, according to the largest biomass. the available energy at two ranches was partitioned priority in latent heat flux, 80,0% in the cambarazal and 56,6% in the pasture, followed by the sensible heat flux, 19,1 and 42,9%, and by the soil heat flux, 0,3 and 7,2%.
Page 1 /227661
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.