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Influência do CO2 via água de irriga??o e da cobertura plástica no solo na Abobrinha
Araújo, Wellington Farias;Botrel, Tarlei Ariel;
Revista Ciência Agron?mica , 2010, DOI: 10.1590/S1806-66902010000200007
Abstract: the experiment was carried out in piracicaba, sp, in order to evaluate the effects of different carbon dioxide levels applied with irrigation water, associated or not to the mulch plastic, on yield of summer squash. the experimental design was in random blocks in split plot design, with the factor levels of co2 in the plot and the mulch plastic in split-plot. the treatments constituted on the following levels: 0; 59; 148 and 247 kg ha-1 of co2. the irrigation was scheduled daily based on a tank class a, using a drip irrigation system. the leaf area, the number of fruit and the yield were evaluated. the levels of co2 and mulch plastic influenced the leaf area; consequently, it provided increment in the number of fruit and yield of summer squash. the best yield of 15, 433 kg ha-1was obtained by 58.6 kg ha-1 of co2 with the plastic mulch.
Irriga??o e aduba??o nitrogenada em milho
Araújo, Wellington Farias;Sampaio, Regynaldo Arruda;Medeiros, Roberto Dantas de;
Scientia Agricola , 1999, DOI: 10.1590/S0103-90161999000400018
Abstract: the aim of this work was to study the effects of water and nitrogen application on corn crop components (br 201) and productivity in the cerrado area of roraima, brazil. the statistical analysis consisted of a 4 x 4 randomized block design, using split plots with 16 treatments and 4 replications. the four water depths used were 392.6; 337.6; 282.6 and 227.6mm and the four nitrogen rates were 0; 50; 100 and 150 kg ha-1. the water depth used influenced the height of the corn plant. irrigation and nitrogen levels influenced the mass of 100 seeds, the number of ears per hectare and the grain productivity. the seed n levels were linearly influenced by the nitrogen fertilization.
Irriga o e aduba o nitrogenada em milho
Araújo Wellington Farias,Sampaio Regynaldo Arruda,Medeiros Roberto Dantas de
Scientia Agricola , 1999,
Abstract: O objetivo deste estudo foi avaliar o efeito das laminas de irriga o e da aduba o nitrogenada sobre alguns componentes de crescimento, produ o e rendimento do milho (BR 201) no Estado de Roraima-BR. O delineamento experimental foi o de blocos ao acaso, arranjados em um esquema de parcelas subdivididas com 16 tratamentos e 4 repeti es. As parcelas foram constituídas pelas laminas de irriga o de 392,6mm; 337,6mm; 282,6mm e 227,6mm e nas subparcelas, pela aduba o nitrogenada (0, 50, 100 e 150 kg ha-1 de N ). A altura de plantas foi influenciada apenas pela lamina de irriga o. A massa de 100 gr os, o número de espigas ha-1 e o rendimento foram influenciadas pela lamina de irriga o e níveis de nitrogênio, sem apresentar efeitos na intera o. O teor de N nos gr os variou linearmente com a aduba o nitrogenada.
Resposta da alface a aduba o nitrogenada. = Response of lettuce to nitrogen fertilization.
Wellington Farias Araújo,Kelly Tagianne Santos de Sousa,Thales Vinícius de Araújo Viana,Benito Moreira de Azevedo
Agro@mbiente On-line , 2011,
Abstract: O trabalho objetivou avaliar o rendimento da alface (Lactuca sativa L.) cv. “Ver nica’ cultivada sob ambiente protegido, em fun o de doses de nitrogênio aplicadas via fertirriga o. O delineamento estatístico foi de blocos casualizados, com cinco tratamentos (0; 60; 120; 180 e 240 kg ha-1 de N) e quatro repeti es. A fonte de N foi a uréia, dividida em sete partes iguais aplicadas aos 7, 9, 11, 14, 16, 19 e 21 dias após o transplante (DAT), por meio da irriga o por gotejamento. As doses de N aplicadas influenciaram negativamente as variáveis estudadas, demonstrando um efeito linear decrescente sobre a massa seca da raiz, a massa seca da parte aérea, massa fresca da parte aérea, número de folhas por planta e a produtividade. = The objective of this study was to evaluate the levels of nitrogen applied by fertirrigation in lettuce (Lettuce sativa L.) cv. “Veronica”. The experiment was done in protected environment using randomized blocks, with five treatments (0, 60, 120,180 and 240 kg ha-1 of N) and four replications. The source of N was the urea, divided in seven equal parts applied to the 7, 9, 11, 14, 16, 19 and 21 days after the transplant (DAT), through drip irrigation. The doses of N applied influenced the studied variables. The fresh mass of the aerial part, the mass evaporated from the aerial part, the number of leaves and the yield decreased with the nitrogen increase.
Resposta do feij?o-caupi as laminas de irriga??o e as doses de fósforo no cerrado de Roraima
Oliveira, Gabriela Almeida;Araújo, Wellington Farias;Cruz, Pablo Lima Souza;Silva, Washington Luis Manduca da;Ferreira, Gilvan Barbosa;
Revista Ciência Agron?mica , 2011, DOI: 10.1590/S1806-66902011000400008
Abstract: this work was carried out to evaluate the effect of irrigation depth and phosphate fertilizer (0; 70; 140; 210 kg ha-1 de p2o5) on yield and production components of cowpea (vigna unguiculata l. walp) cv. novaera at the savanna of roraima, brazil. the experimental design was arranged in a completely randomized block in split-plot and four replications. irrigation depths were applied through a sprinkler line source system. the principal treatments constituted on the depths of irrigation and the secondary treatments by the phosphate fertilizer. significant effects (p < 0.05) of the depth of irrigation and phosphate fertilizer interaction with aerial mass production and mass of 100 grains were observed. the number of grains per pods and size of pod were affected by the phosphate fertilizer only. the highest economical yield (1,306 kg ha-1) was obtained by 89.45 kg of p2o5.
Avalia??o de cultivares de alface em ambiente protegido em Boa Vista, Roraima, Brasil
Araújo, Wellington Farias;Trajano, Eliander Pimentel;Rodrigues Neto, José Luiz;Mour?o Júnior, Moisés;Pereira, Paulo Roberto Valle da Silva;
Acta Amazonica , 2007, DOI: 10.1590/S0044-59672007000200018
Abstract: this study evaluated the growth and yield of six lettuce cultivars under protected cultivation. the experimental design was randomized blocks with six treatments and four replications. the cultivars hortencia, rubra, monica sf1, regina de ver?o, veronica and grandes lagos 659 were evaluated. the air temperature under protected cultivation oscillated between 24,4oc and 31,5oc during the experimental period. rubra and grandes lagos 659 showed the best performance with yields superior to 28,000 kg.ha-1 and fresh weight of 176,7g and 184,4 g, respectively.
A ES DE RESPONSABILIDADE SOCIAL NAS PANIFICADORAS CEARENSES
Jo?o Adamor Dias Neves,Raimundo Wellington Araújo Pessoa
Gest?o & Regionalidade , 2006,
Abstract: O presente estudo analisa como a responsabilidade social empresarial tem sido encaminhada no segmento das panificadoras participantes dos projetos P o, Educa o e Arte e Fornada de Talentos, confrontando a prática com a teoria. Os resultados indicam que elas utilizam práticas de RSE de pouco alcance, consideradas apenas como ensaio de RSE; as a es se atêm à rea o social, abordando um ou mais problemas, tentando amenizá-los ou cumprindo mera obriga o social, enfim, a prática de RSE está longe do que a literatura aponta.
Causas da mortalidade de micros e pequenas empresas: o caso das lojas de um shopping center
Jo?o Adamor Dias Neves,Raimundo Wellington Araújo Pessoa
Revista Organiza??es em Contexto , 2006,
Abstract: O presente estudo investiga as principais causas do fechamento precoce das lojas de um shopping center de uma capital brasileira e tenta identificar a utiliza o das ferramentas mercadológicas pelos proprietários de pequenos negócios, a fim de lhes proporcionar melhor gest o dessa atividade. Para isso, foram analisados os vários fatores que levam as microempresas encerrarem suas atividades com pouco tempo de mercado. Utilizou-se um estudo de caso por meio de pesquisa descritiva, utilizando-se entrevistas, tanto com lojistas em funcionamento quanto com ex-lojistas do shopping, a fim de permitir uma compara o dos dois tipos de gest o. Os resultados indicam ausência de um plano de negócios antes da abertura da loja, falta de planejamento de marketing, insatisfa o dos lojistas com a gest o do shopping, falta de mix apropriado de oferta do shopping, desconhecimento do público-alvo da loja, dentre outros fatores de fechamento precoce das lojas. Recomenda-se maior prepara o dos gestores para lidar com situa es difíceis e maior habilidade na gest o da loja. Finalmente, é imprescindível a elabora o de um plano de negócio antes da abertura da loja, para saber se é viável ou n o sua instala o.
Theoretical Evaluation of Two-Phase Flow in a Horizontal Duct with Leaks  [PDF]
Morgana de Vasconcellos Araújo, Severino Rodrigues de Farias Neto, Antonio Gilson Barbosa de Lima
Advances in Chemical Engineering and Science (ACES) , 2013, DOI: 10.4236/aces.2013.34A1002
Abstract: The transport of oil and its derivates are done, mostly, by pipeline. The time to detect leaks has to be short for pre-venting big disasters in the nature and decreasing losses for industries. The techniques available for leak detection vary from visual inspection to the use of computational techniques such as mathematical modeling. This paper aims to study the fluid dynamics of two-phase flow (water-oil) in the pipe with leakage. The equations of the mass and momentum conservation are numerically solved by using the ANSYSCFX commercial code with the aid of a structured mesh of a horizontal pipe with three holes of leaks. The Eulerian-Eulerian model was adopted considering the oil as continuous phase and water as dispersed phase, and constant fluid properties. With profiles of pressure and volume fraction along the time in the pipe, the influence of leakage on the single-phase (oil) and two-phase (water-oil) was evaluated.
Fumo, bebida alcoólica, migra??o, instru??o, ocupa??o, agrega??o familiar e press?o arterial em Volta Redonda, Rio de Janeiro
Klein, Carlos Henrique;Araújo, José Wellington Gomes de;
Cadernos de Saúde Pública , 1985, DOI: 10.1590/S0102-311X1985000200004
Abstract: in 1979, in the city of volta redonda, a cross-sectional epidemiological investigation was carried out to estimate the prevalence of arterial hypertension and to study the association between different factors and arterial blood pressure. about 650 residents between 20 to 74years old were studied. the habit of smoking, the use of alcohol, the low level of education and the insecurity o f employment are some of the characteristics of people with a greater risk of arterial hypertension and, in general, higher average levels of blood pressure. people who knew that their parents had high blood pressure had higher average blood pressure levels and had more chance of being hypertensive according to who standard (systolic > 160 and/or diastolic > 95mmhg). finally, migrants and natives of volta redonda do not show any significant difference in their average pressure and arterial hypertension prevalence.
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