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Search Results: 1 - 10 of 122422 matches for " José Danilo da Costa;Ruivo "
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Variabilidade sazonal da condutancia estomática em um ecossistema de manguezal amaz?nico e suas rela??es com variáveis meteorológicas
Rodrigues, Hernani José Braz?o;Costa, Rafael Ferreira da;Ribeiro, Jo?o Batista Miranda;Souza Filho, José Danilo da Costa;Ruivo, Maria de Lourdes Pinheiro;Silva Júnior, Jo?o de Athaydes;
Revista Brasileira de Meteorologia , 2011, DOI: 10.1590/S0102-77862011000200003
Abstract: this work investigated the variations of stomatal conductance (gs) in the rainy and dry seasons and its dependence relations with meteorological variables measured in an amazonian mangrove ecosystem. data were originated from the ecobioma project, part of the large scale biosphere-atmosphere experiment in amazon (lba). stomatal conductance followed the tendency of the radiation balance variation, reaching maximum values during the day and minimum values at night. the conductance showed greater fluctuations in the rainy season, with mean value of gs = 0.015 m s-1, however smaller in magnitude than in the dry season. during the dry season, the mean value was gs = 0.027 m s-1, with lower range, varying between 0.010 and 0.042 m s-1. the meteorological variables used for establishing the dependence relations with the daily variability of stomatal conductance were the following; specific moisture deficit (δq), vapor pressure deficit (pvd), net radiation (rn) and wind velocity (vv). the pvd showed the best correlation with gs, with r2 = 0.99 for both periods. in spite of the importance of vv in the gaseous changes between the vegetation and the atmosphere, it presented the smallest influence in the mean variation of the gs, with r2 = 0,44 for the rainy and r2 =0,51 for the dry period.
Influência de variáveis meteorológicas na produ??o de liteira na Esta??o Científica Ferreira Penna, Caxiuan?, Pará
Silva, Rosecélia Moreira da;Costa, José Maria Nogueira da;Ruivo, Maria de Lourdes Pinheiro;Costa, Antonio Carlos L?la da;Almeida, Samuel Soares;
Acta Amazonica , 2009, DOI: 10.1590/S0044-59672009000300012
Abstract: the evaluation of the influence on the exclusion of rainfall on the variation of litter production was done in caxiuan? forest reserve at ferreira penna scientific station (1o 42 ' s, 51o 31 ' w) during the period from march, 2001 to february, 2003 with the objective of identifying the main meteorological variables and the main components of the monthly water balance that affected the production and decomposition of litter. this work was part of the subproject experiment of drought in the forest (esecaflor), that aimed to study the long term impacts of drought on the water, energy and carbon dioxide fluxes in the amazon forest. the sazonality of total litter production and its components (leaves, brushwood and reproductive parts) was well established, with the occurrence of a greater litter production during the months with lower precipitation. the monthly litter production during the experimental period ranged from 294.78 kg.ha-1 to 1758.69 kg.ha-1, with an average of 777.70 kg.ha-1. the total litter production was partitioned in leaves (61.40 %), brushwoods (18.45 %) and reproductive parts (20.14 %). the results obtained in the undisturbed plot showed a higher litter production, about 25 %, compared to the litter production in the plot under the exclusion of water. the variables more strongly correlated with litter production and its components were wind speed, global solar radiation density flux, photosynthetic active radiation density flux, soil temperature at 5 cm depth, precipitation, soil water deficit and water surplus.
Mecanismos de controle da varia??o sazonal da transpira??o de uma floresta tropical no nordeste da amaz?nia
Souza Filho, José Danilo da Costa;Ribeiro, Aristides;Costa, Marcos Heil;Cohen, Julia Clarinda Paiva;
Acta Amazonica , 2005, DOI: 10.1590/S0044-59672005000200012
Abstract: in the present work we study the seasonal variation of the transpiration of a tropical forest, and its dependence on biotic and abiótic factors. we used data of the project carbopará, part of the large scale biosphere-atmosphere experiment in amazonia (lba), collected in the national forest of caxiuan?, northeastern amazonia. the average transpiration in a 39-day period during the rainy season was 2.9 mm day-1. in a 29-day period during dry season, the average transpiration was 4.3 mm day-1. the maximum values of the surface conductivity (cs) are 0.060 m s-1 and 0.045 m s-1 for the rainy and dry period, respectively, observed at 08:00 h local time. the aerodynamic conductance averages (ca) 0.164 m s-1 and 0.210 m s-1, for the rainy and dry periods, respectively, while the maximum values of ca are 0.220 and 0.375 m s-1, for the same periods, respectively. it was verified that cs presents an inverse exponential relationship with the deficit of atmospheric water vapor, for different intervals of global solar irradiance. the hourly analysis of the decoupling factor suggests that the morning transpiration is mainly controlled by the availability of energy. during the afternoon, on the other hand, for both periods studied, the forest becomes progressively coupled to the atmosphere, denoting larger superficial control on the transpiration process.
IMPLICACIONES DE CRISIS ECONóMICAS EN LA RELEVANCIA DE LA INFORMACIóN CONTABLE DE LAS EMPRESAS BRASILE AS
Fábio Moraes da Costa,Danilo José Santana dos Reis,Arilda Magna Campagnaro Teixeira
Revista de Educa??o e Pesquisa em Contabilidade , 2012,
Abstract: Este estudio examina si en períodos de crisis financieras en el Brasil (1997-1999, 2002 y 2007-2008) la relevancia de la información contable sufre impacto, tanto en relación al patrimonio líquido como en relación al resultado. Para tanto, la muestra fue compuesta por 1.904 observaciones, entre 1997 y 2010. Se trata de un estudio empírico que se utiliza de análisis de regresión con datos en panel. Para responder a la cuestión de pesquisa fue utilizada uma regresión siendo empleada una variable dummy para los a os de choques macroeconómicos negativos y como éstos afectan la relación entre los precios de mercado y las variables contables. Los resultados indican que las crisis afectan, positivamente, la relevancia del patrimonio líquido y, negativamente, la del lucro líquido, corroborando estudios realizados anteriormente en Tailandia y en México. Así, los efectos macroeconómicos deben ser llevados en consideración en los análisis de cómo la información contable captura la realidad económica de las empresas. Se sugiere, para las próximas pesquisas, que sea analizada una muestra de países latinoamericanos para evaluar si hay similaridad en los efectos de la relevancia de la información contable o si las políticas establecidas para mitigar los efectos de la crisis pueden llevar a impactos diferenciados.
IMPLICATIONS OF ECONOMIC CRISES ON THE VALUE RELEVANCE OF ACCOUNTING INFORMATION IN BRAZILIAN COMPANIES
Fábio Moraes da Costa,Danilo José Santana dos Reis,Arilda Magna Campagnaro Teixeira
Revista de Educa??o e Pesquisa em Contabilidade , 2012,
Abstract: This papers investigates the impact of financial crises occurred in Brazil (1997-1999, 2002 and 2007-2008) on the value relevance of book value and earnings. The final sample comprised 1,904 observations from Brazilian listed companies, from 1997 till 2010. It is an empirical study based on panel data regression. To answer the research question, a dummy was applied for each year of negative macroeconomic shocks and how they affected the relation between market prices and accounting variables. Empirical evidence indicates that financial crises affected the value relevance of book value positively and the value relevance of earnings negatively, similarly to other countries like Thailand and Mexico. Therefore, macroeconomic factors should be taken into consideration when analyzing how accounting information captures the underlying characteristics of a firm. Future research could consider companies from other countries in Latin America and evaluate if the effects are similar or not. This is important because macroeconomic policies implemented to mitigate the effects of a crisis could lead to different impacts on the relevance of accounting information.
IMPLICA ES DE CRISES ECON MICAS NA RELEV NCIA DA INFORMA O CONTáBIL DAS EMPRESAS BRASILEIRAS
Fábio Moraes da Costa,Danilo José Santana dos Reis,Arilda Magna Campagnaro Teixeira
Revista de Educa??o e Pesquisa em Contabilidade , 2012,
Abstract: Este estudo examina se em períodos de crises financeiras no Brasil (1997-1999, 2002 e 2007-2008) a relevancia da informa o contábil sofre impacto, tanto em rela o ao patrim nio líquido quanto ao resultado. Para tanto, a amostra foi composta por 1.904 observa es, entre 1997 e 2010. Trata-se de um estudo empírico que se utiliza de análise de regress o com dados em painel. Para responder à quest o de pesquisa foi utilizada uma regress o empregando-se uma variável dummy para os anos de choques macroecon micos negativos e como estes afetam a rela o entre os pre os de mercado e as variáveis contábeis. Os resultados indicam que as crises afetam, positivamente, a relevancia do patrim nio líquido e, negativamente, a do lucro líquido, corroborando estudos realizados anteriormente na Tailandia e no México. Assim, os efeitos macroecon mic os devem ser levados em considera o nas análises de como a informa o contábil captura a realidade econ mica das empresas. Sugere-se, para as próximas pesquisas, que seja analisada uma amostra de países latino-americanos para avaliar se há similaridade nos efeitos da relevancia da informa o contábil ou se as políticas estabelecidas para mitigar os efeitos da crise podem levar a impactos diferenciados.
Aspectos da reestrutura o das universidades federais por meio do Reuni: um estudo no estado de Santa Catarina
Danilo de Melo Costa,Cláudio José Amante,Alexandre Marino Costa,Cláudio Heleno Pinto da Silva
Revista Gest?o Universitária na América Latina : Revista GUAL , 2011, DOI: http://dx.doi.org/10.5007/1983-4535.2011v4nespp01
Abstract: The Brazilian Federal Universities are facing a major transformation that occurs through its restructuring and expansion. New universities and new campuses in universities that already existed are now present in all units of the federation. In the state of Santa Catarina, this growth is guided with the restructuring of the Federal University of Santa Catarina, by means of Reuni, and the creation of the Federal University of Southern Frontier, founded in the range of the program. Therefore, this article attempted to analyze the main aspects of this restructuring in the state of Santa Catarina. For this purpose, was realized an exploratory and qualitative research. To collect and analysis of data, were used reports from MEC, INEP, ANDIFES, laws, decrees and material already published that addressed this subject. In addition, interviews were realized with the Deans of the institutions studied. The results showed that the expansion of the federal universities have, in fact, happened, and in Santa Catarina, this phenomenon was confirmed. Besides the expansion of the number of sits, it was found that Reuni has given more opportunities to people for economically disadvantaged classes, signaling the beginning of an important democratization of higher education in Brazil.
Variabilidade quantitativa de popula??o microbiana associada às condi??es microclimáticas observadas em solo de floresta tropical úmida
Rodrigues, Hernani José Braz?o;Sá, Leonardo Deane de Abreu;Ruivo, Maria de Lourdes Pinheiro;Costa, Ant?nio Carlos L?la da;Silva, Rommel Benicio da;Moura, Quêzia Leandro de;Mello, Ivan Fiuza de;
Revista Brasileira de Meteorologia , 2011, DOI: 10.1590/S0102-77862011000400012
Abstract: this study is a proposal for a scientific contribution to the understanding of the interrelationships between density population of soil microorganisms associated with seasonal microclimatic variability in tropical rainforest, also considering a case study of extreme event. some organisms, especially soil microorganisms are very sensitive to small variations in microclimate (sun light, temperature, soil moisture, wind, sensible heat, latent heat, etc). surely these conditioning factors are important for understanding the spatial distribution of these living things in natural ecosystems, inhabited by a variety of microorganisms (mushroom and bacteria) that were studied for their distribution and density, using the technique of "pour plate" count of "petri plates" following the methodology utilized for de-polli and guerra, described by clark. this study was conducted in two experimental areas ppbio (natural rainforest area) and esecaflor (one acre covered area to simulate drought) in caxiuan?-pa, with continuous measurements of microclimatic variables such as temperature, humidity and rainfall, and the evaluation of spatial and temporal distribution patterns of the species abundance and richness, to establish a monitoring procedure of soil fungi and bacteria associated with climate variability in the national forest caxiuan?. the experimental areas are predominantly yellow latossol soils. microbiological analysis showed that fungi developed better during the dry season and bacteria during rainy season, and their populations decrease with depth, except in a changed environment. correlation values between seasonal variation of fungi and bacteria population and varying temperature and soil humidity were satisfactorily for any season in both sites.
Estudo de libera??o e permea??o in vitro do diclofenaco de dietilam?nio em microemuls?o gel-like
Silva, José Alexsandro da;Santana, Davi Pereira de;Bedor, Danilo Galindo César;Borba, Valeria Ferreira da Costa;Lira, Ana Amélia Moreira;Egito, Eryvaldo Socrates Tabosa do;
Química Nova , 2009, DOI: 10.1590/S0100-40422009000600005
Abstract: the goal of this study was to produce and characterize a new microemulsion gel-like carrier system (meg) by using the pseudo-ternary phase-diagram concept. the diclofenac diethylamine (dda) was incorporated in the meg and its in vitro release and permeation profiles were performed using franz-type diffusion cells. the results revealed that the commercial dda emulgel provided significantly higher kp of dda (2.2-fold) as compared to the meg. similar data were obtained in the permeation studies in which dda kp 4.7-fold higher. therefore, meg presents higher potential as a topical delivery system for dda when compared to the commercial dda emulgel.
Quantifica??o do fluxo portal em indivíduos sadios: compara??o entre ressonancia magnética e ultra-som Doppler
Costa, Juliana Dantas da;Le?o, Alberto Ribeiro de Souza;Santos, José Eduardo Mour?o;Moulin, Danilo Sales;Sebastianes, Patrícia Moreno;D'Ippolito, Giuseppe;
Radiologia Brasileira , 2008, DOI: 10.1590/S0100-39842008000400004
Abstract: objective: to evaluate the inter-observer agreement between doppler ultrasonography and magnetic resonance imaging in the quantification of portal blood flow in healthy individuals, as well as evaluating the reproducibility of both methods. materials and methods: a prospective, transverse, observational and self-paired study was developed evaluating 20 healthy volunteers whose portal blood flow was measured by means of doppler ultrasonography and magnetic resonance imaging performed by two independent observers. interobserver and intermethod agreements were calculated using the intraclass and pearson's correlation coefficients. results: the agreement between doppler ultrasonography and magnetic resonance imaging was low (intraclass coefficient: 1.9%-18.2%; pearson's coefficient: 0.1%-13.7%; p=0.565). mean values for the portal blood flow measured by doppler ultrasonography and magnetic resonance imaging were respectively 0.768 l/min and 0.742 l/min. interobserver agreement for quantification of the portal blood flow by doppler ultrasonography and magnetic resonance imaging was respectively reasonable (intraclass coefficient: 43.3%; pearson's coefficient: 43.0%) and excellent (intraclass coefficient: 91.4%; pearson's coefficient: 93.4%). conclusion: in the present study, magnetic resonance imaging demonstrated to be a reliable method for quantifying the portal blood flow, with a higher interobserver agreement than doppler ultrasonography. the intermethod agreement was low.
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