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Search Results: 1 - 10 of 198125 matches for " Marcelo de Carvalho Alves "
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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.

A História da Ciência iluminando o ensino de vis?o
Barros, Marcelo Alves;Carvalho, Anna Maria Pessoa de;
Ciência & Educa??o (Bauru) , 1998, DOI: 10.1590/S1516-73131998000100008
Abstract: our aim in this article is to discuss the contributions of history of science to the teaching of physics. we will show two ways to use the history of science in the classroom: by one side, serving as a tool to help the teacher to understand the difficulties of the students and, by other side, to promote a reflection on the own nature of science.
Sociodemographic and obstetric profile from pregnant women assisted in Iguatu - CE
Marcelo Luiz Carvalho Gon?alves,Helder Oliveira e Silva,Tatiana Alves de Oliveira,Leila Vieira Rodrigues
Revista Brasileira em Promo??o da Saúde , 2012,
Abstract: Objective: To evaluate the sociodemographic and obstetric profile of puerperae assisted in Iguatu-CE, Brazil. Methods: This is a descriptive study with quantitative approach. The sample consisted of 178 postpartum women living in the city under study. Data collectionwas conducted in a public maternity care in the city, from August to September 2008, through interviews. The data were analyzed by SPSS 11.0. The variables were subjected to univariate analysis. Results: The mean age was 23.8 years, 100 (56.2%) were from urban areas, 36(20.2%) were single, 109 (61.2%) of the household activities performed without pay, 110 (62.3%) began prenatal care in first quarter, 20 (11.2%) smoked and 6 (3.4%) drank alcoholduring pregnancy, 49 (28.2%) participated in some educational activity, 166 (96.6%) were VDRL the first and 108 (62.1%) had anti-HIV during prenatal. Conclusion: The sociodemographic profile of the studied population can be characterized by young puerperaewith some schooling, married or in stable relationships and family income between one and two minimum salaries, which made satisfactory amount of prenatal visits, had access to exams and had guarantee of delivery care in the public hospital of reference.
Influência do extrato pirolenhoso na calda de pulveriza??o sobre o teor foliar de nutrientes em limoeiro 'Cravo'
Zanetti, Marcelo;Cazetta, Jairo Osvaldo;Mattos Júnior, Dirceu de;Carvalho, Sérgio Alves de;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000300037
Abstract: this research studied the effect of pyroligneous acid (pa) presence in the micronutrient solution sprayed on leaves on the foliar nutrient content of 'rangpur lime' (citrus limonia osbeck0) seedlings, under screen house. an experiment in a randomized complete block design with six treatments and four replicates was set up. treatments consisted of leaf spraying with the following solutions: t0 = water; t1 = micronutrients solution without pa; t2 = micronutrients solution+ pa (1 cm3 dm-3); t3 = micronutrients solution + pa (2 cm3 dm-3); t4 = micronutrients solution + pa (5 cm3 dm-3); t5 = micronutrients solution + pa (10 cm3 dm-3). the micronutrient solutions were prepared by using sulphates of cu, fe, mn and zn (250 mg dm-3 of the elements), and boric acid (42.5 mg dm-3 of b). the experiment was set up on 0.280 dm3 conical containers, in growing media with no addition of micronutrients. the solutions were sprayed once, at 140 days after planting (dap), when the plants were about 20 cm high. at the end of the experiment (160 dap), dry mass of plants and concentrations of nutrients of aerial part and root system were evaluated. the presence of pyroligneous acid in the spraying solution did not affect b, fe and zn concentration in the leaves. however, increased cu and mn concentration for treatments containing pa at 10 cm3 dm-3 in the micronutrients solution. it was also observed that plants sprayed with solutions of pa (1 to 10 cm3 dm-3) + micronutrients showed lower fe and higher ca concentration on the root system.
Uso de subprodutos de carv?o vegetal na forma??o do porta-enxerto limoeiro 'Cravo' em ambiente protegido
Zanetti, Marcelo;Cazetta, Jairo Osvaldo;Mattos Júnior, Dirceu de;Carvalho, Sérgio Alves de;
Revista Brasileira de Fruticultura , 2003, DOI: 10.1590/S0100-29452003000300037
Abstract: the effect of finely grounded charcoal and pyroligneous acid (pa) in mixture with a commercial growing media and pa sprayed on leaves on growth of rangpur lime (citrus limonia osbeck) seedlings under screen house was studied. treatments consisted in a combination of 3 levels of charcoal (0, 100 and 200 cm3 dm-3) mixture on the commercial growing media, 2 rates of pa mixtured (0 and 20 cm3 dm-3) to a growing media (240 cm3 per dm3 of growing media), and 3 rates of pa (0, 5 and 10 cm3 dm-3) sprayed on the leaves, with 4 replications. the experiment was carried out in a randomized complete block design, and analyzed as a factorial 3 x 2 x 3. growth of seedlings was evaluated at 150 and 180 days after planting. the presence of charcoal at 100 cm3 dm-3 in the media did not influence on growth of seedlings. however, the mixture with 200 cm3 dm-3 of charcoal reduced production of total dry mass and high of the plants. the addition of pa (solution 20 cm3 dm-3) to the media reduced plant growth, and sprayed (solutions 5 and 10 cm3 dm-3) on the leaves reduced seedlings diameter.
Uso de subprodutos de carv o vegetal na forma o do porta-enxerto limoeiro 'Cravo' em ambiente protegido
Zanetti Marcelo,Cazetta Jairo Osvaldo,Mattos Júnior Dirceu de,Carvalho Sérgio Alves de
Revista Brasileira de Fruticultura , 2003,
Abstract: O trabalho teve como objetivo avaliar o efeito do uso de fino de carv o no substrato e da aplica o de extrato pirolenhoso no substrato e na planta sobre o desenvolvimento de porta-enxertos de limoeiro 'Cravo' (Citrus limonia Osbeck) cultivados em ambiente protegido. O experimento foi desenvolvido no delineamento em blocos casualisados, com análise em esquema fatorial 3 x 2 x 3, sendo: 3 propor es de fino de carv o (0, 100 e 200 cm3 dm-3) em mistura com substrato comercial, 2 concentra es de extrato pirolenhoso (0 e 20 cm3 dm-3) misturadas no substrato (240 cm3 por dm3 de substrato) e 3 concentra es de extrato pirolenhoso (0, 5 e 10 cm3 dm-3) pulverizadas na parte aérea, em 4 repeti es. Aos 150 e 180 dias após o plantio foram realizadas avalia es do desenvolvimento das plantas. As misturas de fino de carv o e substrato comercial contendo fino de carv o na propor o de 100 cm3 dm-3 n o influíram no desenvolvimento de porta-enxertos de limoeiro 'Cravo' , porém, na propor o de 200 cm3 dm-3 prejudica o desenvolvimento dos mesmos. O umedecimento pré-plantio do substrato com solu o diluída (20 cm3 dm-3) de extrato pirolenhoso ou pulveriza o da parte aérea das plantas com solu es a 5 e 10 cm3 dm-3 provoca redu o do desenvolvimento de porta-enxertos de limoeiro 'Cravo' .
Efeitos da colheita manual na bienalidade do cafeeiro em Ijaci, Minas Gerais
Silva, Fábio Moreira da;Alves, Marcelo de Carvalho;Souza, Júlio César Silva;Oliveira, Marcelo Silva de;
Ciência e Agrotecnologia , 2010, DOI: 10.1590/S1413-70542010000300014
Abstract: this study analyzed the relation between coffee yield and defoliation during the process of manual harvest in the agricultural harvests of 2005, 2006 and 2007. the experiment was conducted at the cafua farm, located in the municipality of ijaci, minas gerais, in an area of 6.5 ha of coffee crop (coffea arabica l.) catuaí vermelho iac-99 cultivar. an irregular grid was demarcated in the area with a distance of 25x25 and 50x50m, totaling 67 sampling points, which were evaluated coffee production (l plant-1) obtained through harvest in cloth as well as defoliation of plants, quantified by the weight of leaves (a) (kg plant-1) after manual harvest. pearson correlation analysis was used to verify the linear relationship between productivity and defoliation in different evaluated periods. the spatial dependence of the data was already analyzed through semivariogram adjustments and kriging interpolation. based on the analyses, it was found that manual harvest caused more defoliation in places with higher productivity and reduced the yield in the subsequent year, by the increase of defoliation on plants and reduction of the photosynthetically active radiation intercepted by the canopy of these plants, leading to the biannuality of the production.
Efeito da densidade larval no tamanho de adultos de Aedes aegypti criados em condi??es de laboratório
Gama, Renata Antonaci;Alves, Karina de Carvalho;Martins, Reane Ferreira;Eiras, álvaro Eduardo;Resende, Marcelo Carvalho de;
Revista da Sociedade Brasileira de Medicina Tropical , 2005, DOI: 10.1590/S0037-86822005000100014
Abstract: to evaluate the influence of larval density in development of aedes aegypti mosquitoes we evaluated three different densities. it was observed that conditions of high larval density and shortage of food produced a reduction in the size of adults and increased mortality rate of aedes aegypti in laboratory conditions.
Molecular analysis of an integrative conjugative element, ICEH, present in the chromosome of different strains of Mycoplasma hyopneumoniae
Pinto, Paulo Marcos;Carvalho, Marcos Oliveira de;Alves-Junior, Leonardo;Brocchi, Marcelo;Schrank, Irene Silveira;
Genetics and Molecular Biology , 2007, DOI: 10.1590/S1415-47572007000200014
Abstract: diversification of bacterial species and pathotypes is largely caused by lateral gene transfer (lgt) of diverse mobile dna elements such as plasmids, phages, transposons and genomic islands. thus, acquisition of new phenotypes by lgt is very important for bacterial evolution and relationship with hosts. this paper reports a 23 kb region containing fourteen cdss with similarity to the previous described integrative conjugal element of mycoplasma fermentans (icef). this element, named iceh, is present as one copy at distinct integration sites in the chromosome of 7448 and 232 pathogenic strains and is absent in the type strain j (non-pathogenic). notable differences in the nucleotide composition of the insertion sites were detected, and could be correlated to a lack of specificity of the iceh integrase. although present in strains of the same organism, the iceh elements are more divergent than the typical similarity between other chromosomal locus of mycoplasma hyopneunomiae, suggesting an accelerated evolution of these constins or an ongoing process of degeneration, while maintaining conservation of the tra genes. an extrachromosomal form of this element had been detected in the 7448 strain, suggesting a possible involvement in its mobilization and transference of cdss to new hosts.
Tabagismo e etilismo em funcionários da Universidade Estadual do Ceará
Sabry, Maria Olganê Dantas;Sampaio, Helena Alves de Carvalho;Silva, Marcelo Gurgel Carlos da;
Jornal de Pneumologia , 1999, DOI: 10.1590/S0102-35861999000600004
Abstract: the aim of the present study was to identify smoking and alcohol drinking practices among universidade estadual do ceará employees in the city of fortaleza. the study used 317 employees as subjects. an interview questionnaire containing personal, socioeconomic, tobacco and alcohol consumption data was applied. the tabulation and analysis were made by epi-info 6.0. 157 of the interviewed subjects were male and 160 were female, the most prevalent age bracket being 30-49 years of age, and high level of instruction. 146 workers showed a family income starting from 10 minimal living wages per month. 83 workers were considered smokers, and a higher prevalence was detected among males (56). mean tobacco consumption was 12.3 cigarettes a day, a practice that took place in the last 23.2 years. alcohol was ingested by 183 employees and the prevalence was also higher among males. the consumption occurred mainly on weekends or rarely. the most ingested drink was beer - 96, followed by brazilian white rum - 20 employees. the mean daily consumption of ethanol was 29.9 g. the ones who were both smokers and drinkers were mainly males. the instruction and income level were higher among smoking females and the income level was higher among drinking females. although the prevalence of tobacco and alcohol consumption was low, it is a risk of chronic-degenerative diseases, specially in relation to the ethanol ingested by males. it is necessary to continue this study to provide a deeper association among the different environmental variables.
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