Publicações - engenharias
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Shivelly Los Galetto;
Adriel Ferreira da Fonseca;
Silvano Harkatin;
André Carlos Auler;
Igor Quirrenbach de Carvalho
Palavra-chave:
Zea mays L.;
Mehlich-1;
Ion exchange resin;
Modified Morgan
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Agronomia; Ciência do Solo; Fertilidade do Solo e Adubação;
CIENCIAS_AGRARIAS; Agronomia; Fertilidade do Solo;
Engenharias; Engenharia Química; Tecnologia Química; Fertilizantes
resumo ...
(en)
The objectives of this study were to assess the concentrations of available P extracted using the Mehlich-1 (M1), ion exchange resin (IER) and modified Morgan (MM) methods in different soil layers after 36 months of experimentation with the application of phosphates in a crop-livestock integration system (CLIS). Moreover, this study aimed to assess which extraction method provides the best correlation of P concentrations with the maize crop attributes. The treatments consisted of applying annual doses (0, 60, 120 and 180 kg ha -1 of P 2 O 5 ) on the soil surface of the total area during the sowing of winter forage crops (black oats or annual ryegrass) in the form of triple superphosphate (TSP), rock phosphate (RP) or magnesium thermophosphate (MTP). After 36 months of experimentation (April 2012) and following the maize harvest, soil samples were collected from the 0-5, 5-10, 10-15 and 15-20 cm layers to assess the concentrations of available P using the M1, IER and MM extraction methods. The dry matter yield (DMY), the grain yield (GY), the accumulation of phosphorus in the dry matter (P-DM) and the export of phosphorus (P-Ex) were quantified in maize following the harvest to predict the effects of the different extraction methods on P availability. The IER method extracted greater amounts of available P, followed by the M1 and MM extractions. The treatments that included the application of TSP and either the M1 or IER extractions had similar efficacies when correlated with the DMY, GY, P-DM and P-Ex attributes of maize. The P extracted by the ion exchange resin was most correlated with P-DM and P-Ex for the water-insoluble P sources (RP and MTP). The MM solution was ineffective at predicting the bioavailability of P for maize grown in a soil with high clay content and iron and aluminum oxides that had received varying doses and sources of P applications in a CLIS.
(pt)
The objectives of this study were to assess the concentrations of available phosphorus (P) extracted using the Mehlich-1 (M1), ion exchange resin (IER) and modified Morgan (MM) methods after 36 months of experimentation with the application of phosphates in a crop-livestock integration system (CLIS). Moreover, this study aimed to assess which extraction method provides the best correlation of P concentrations with the maize crop attributes. The treatments consisted of applying annual doses of P2O5 on the soil surface of the total area during the sowing of winter forage crops in the form of triple superphosphate (TSP), rock phosphate (RP) or magnesium thermophosphate (MTP). After 36 months of experimentation, soil samples were collected from the 0-5, 5-10, 10-15 and 15-20 cm layers to assess the concentrations of available P. The dry matter yield (DMY), the grain yield (GY), the accumulation of phosphorus in the dry matter (P-DM) and the export of phosphorus (P-Ex) were quantified in maize. The IER method extracted greater amounts of available P, followed by the M1 and MM extractions. The treatments that included the application of TSP and either the M1 or IER extractions had similar efficacies when correlated with the DMY, GY, P-DM and P-Ex attributes of maize. The P extracted by the IER was most correlated with P-DM and P-Ex for the water-insoluble P sources (RP and MTP). The MM solution was ineffective at predicting the availability of P for maize grown in a soil with that had received varying doses and sources of P applications in a CLIS.
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Bianca Porfírio;
Julio Gomes;
Paulo Roberto Janissek
Palavra-chave:
resíduos sólidos;
Aterro controlado;
Avaliação de risco;
Saúde humana
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Saneamento Ambiental; Qualidade do Ar, das Águas e do Solo
resumo ...
O presente trabalho teve por objetivo a avaliação do risco à saúde humana na área do aterro...
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Julio Gomes;
Nelson Oswaldo Luna Caicedo
Palavra-chave:
fluxo de água subterrânea;
contaminação de água subterrânea;
simulação probabilística;
simulação gaussiana sequencial
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Recursos Hídricos; Águas Subterráneas e Poços Profundos;
Engenharias; Engenharia Civil; Engenharia Hidráulica; Hidrologia
resumo ...
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Julio Gomes;
Nelson Oswaldo Luna Caicedo
Palavra-chave:
avaliação do risco à saúde humana;
contaminação de água subterrânea;
transporte de contaminante;
simulação estocástica
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Recursos Hídricos; Águas Subterráneas e Poços Profundos;
Engenharias; Engenharia Civil; Engenharia Hidráulica; Hidrologia;
Engenharias; Engenharia Sanitária; Saneamento Ambiental; Qualidade do Ar, das Águas e do Solo
resumo ...
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Cristiano Milek;
Regina Tiemy Kishi;
Julio Gomes
Palavra-chave:
aguas subterrâneas;
Análise de Risco;
Aquifero Carste;
Vulnerabilidade de aquíferos
Áreas do conhecimento:
Engenharias; Engenharia Hidráulica; Hidrologia;
Engenharias; Engenharia Sanitária; Recursos Hídricos; Águas Subterráneas e Poços Profundos
resumo ...
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CRISTIANE MARIA BORN;
Cíntia Mara Ribas de Oliveira;
Selma Aparecida Cubas
Palavra-chave:
Cemitérios;
Contaminação;
aguas subterrâneas;
Curitiba
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Saneamento Ambiental; Qualidade do Ar, das Águas e do Solo;
Engenharias; Engenharia Sanitária; Recursos Hídricos; Águas Subterráneas e Poços Profundos
resumo ...
Associação Brasileira de Engenharia Sanitária e Ambiental
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Juliano de Andrade;
Patricio Rodolfo Impinnisi;
Carlos Camargo
Palavra-chave:
BATERIA CHUMBO ÁCIDO;
Armazenamento de energia;
dimensionamento
Áreas do conhecimento:
Engenharias; Engenharia Elétrica; Telecomunicações;
Engenharias; Engenharia de Energia; Planejamento Energético; Sistemas Energéticos
resumo ...
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Seyedali Mirjalili;
Gai-Ge Wang;
LEANDRO DOS SANTOS COELHO
Palavra-chave:
otimização por enxame de partículas;
gravitational search algorithm;
otimização binária
Áreas do conhecimento:
Engenharias; Engenharia Elétrica; Inteligência Artificial; Inteligência Computacional
resumo ...
The PSOGSA is a novel hybrid optimization algorithm, combining strengths of both particle swarm optimization (PSO) and gravitational search algorithm (GSA). It has been proven that this algorithm outperforms both PSO and GSA in terms of improved exploration and exploitation. The original version of this algorithm is well suited for problems with continuous search space. Some problems, however, have binary parameters. This paper proposes a binary version of hybrid PSOGSA called BPSOGSA to solve these kinds of optimization problems. The paper also considers integration of adaptive values to further balance exploration and exploitation of BPSOGSA. In order to evaluate the efficiencies of the proposed binary algorithm, 22 benchmark functions are employed and divided into three groups: unimodal, multimodal, and composite. The experimental results confirm better performance of BPSOGSA compared with binary gravitational search algorithm (BGSA), binary particle swarm optimization (BPSO), and genetic algorithm in terms of avoiding local minima and convergence rate.
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Diana Maria Cancelli;
DIAS, N. L.
Palavra-chave:
emissões veiculares;
poluição atmosférica
Áreas do conhecimento:
Engenharias; Engenharia Sanitária; Poluição do ar
resumo ...
Nos últimos anos, a preocupação com o aumento das emissões de poluentes por veículos automotores...
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Wang Chong;
Kellem de Melo Soares;
Luis Eduardo Kosteski
Palavra-chave:
bridging stress;
discrete element method;
fiber reinforced composite;
toughening
Áreas do conhecimento:
Engenharias; Mecânica dos Sólidos; Análise de Tensões;
Engenharias; Engenharia de Materiais e Metalúrgica; Materiais Não-Metálicos; Cerâmicos
resumo ...
The problem of toughening in brittle materials reinforced by fibers is complex, involving all of the mechanical properties of fibers, matrix and the fiber/matrix interface, as well as the geometry of the fiber. Development of new numerical methods appropriate to toughening simulation and analysis is necessary. In this work, we have performed simulations and analysis of toughening in brittle matrix reinforced by randomly distributed fibers by means of the discrete elements method. At first, we put forward a mechanical model of toughening contributed by random fibers. Then with a numerical program, we investigated the stress, damage and bridging force in the composite material when a crack appeared in the brittle matrix. From the results obtained, we conclude that: (i) fibers of high strength and low elasticity modulus are beneficial to toughening; (ii) fibers of relatively high elastic modulus compared to the matrix may result in substantial matrix damage due to spalling effect; (iii) employment of high-strength synthetic fibers is a good option for toughening. We expect that the combination of the discrete element method (DEM) with the finite element method (FEM) can increase the versatility and efficiency of the software developed. The present work can guide the design of ceramic composites of high performance through the optimization of the parameters.
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