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| Registros recuperados: 123 | |
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| FAVACHO,Breno Inglis; VAZ,Jerson Rogério Pinheiro; MESQUITA,André Luiz Amarante; LOPES,Fábio; MOREIRA,Antonio Luciano Seabra; SOEIRO,Newton Sure; ROCHA,Otávio Fernandes Lima da. |
| ABSTRACTIn the Amazon, river navigation is very important due to the length of navigable rivers and the lack of alternative road networks. Boats usually operate in unfavorable conditions, since there is no hydrodynamic relation among propellers, geometry, and the dimensions of the boat hull. Currently, there is no methodology for propeller hydrodynamic optimization with low computational cost and easy implementation in the region. The aim of this work was to develop a mathematical approach for marine propeller design applied to boats typically found on Amazon rivers. We developed an optimized formulation for the chord and pitch angle distributions, taking into account the classical model of Glauert. A theoretical analysis for the thrust and torque... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Optimization; BEMT model; Theory of Glauert; Wageningen B3-50. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672016000100037 |
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| pourbagher, roghayeh; rohani, abbas; rahmati, Mohammad Hashem; Abbaspour-Fard, Mohammad Hossein. |
| This paper investigated the effect of the components of fluidized bed dryer with two thermal sources of heater and infrared such as air temperature at three levels (40, 50 and 60°C) equivalent to radiation intensity of 0.031, 0.042 and 0.053 W.cm-3 in infrared dryer, final moisture content of dried Tarom and Shirudi varieties at three levels (8-9%, 9-10% and 10-11% (d.b.)) and air velocity of 4.5 ms-1 on the milling characteristic and drying time. To this end, stepwise regression was used for selecting the best models for each dependent variable in terms of the independent variables and genetic algorithm was used for optimizing the parameters of dryer with simultaneous consideration of cracked and fractured grains, milling recovery, degree of milling and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Optimization; Infrared; Milling characteristic; Paddy. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4666 |
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| Absalan, Ghafour; Kianmehr, Mohammad Hossein; Arabhosseini, Akbar; Kouravand, Shahriar. |
| Compression is important to prevent a deterioration in quality pellets for long term storage and the moisture content of the pellets must be reduced to or less. In this research the quality of pellet of compost was studied at air temperatures of 50, 60 and 70, air velocities of 0.5, 1, and 1.5 m/s, particle sizes of 16(1.18mm) and 10(2mm) and pellet diameters of 6 and 8 mm. The Taguchi quality engineering method was used to investigate the effects of parameters on compressive strength of pellet. An orthogonal array, signal-to-noise (S/N) ratio analysis of variance (ANOVA) were employed to analyze the effect of these compressive strength parameters. Thus, the optimal performance for the compressive strength of pellet was obtained at first level of factor... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compost; CS of pellet; Optimization; Taguchi. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3175 |
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| Olusegun-Omolola,Adewale; Obiefuna-Jideani,Afam Israel; Francis-Kapila,Patrick; Adaora-Jideani,Victoria. |
| Abstract Luvhele and Mabonde banana varieties are bananas grown in Limpopo province of South Africa and they are rich in nutriments and antioxidants. Optimization of oven drying conditions of Luvhele and Mabonde banana varieties were studied using response surface methodology. The drying was performed according to a central composite rotatable design to explore two sets of variables: oven temperatures (40, 50 and, 60 °C) and drying time (1260, 1080, and 900 min) for Luvhele; (40, 50 and, 60 °C) and (1260, 900, and 600 min) for Mabonde. The color and texture (hardness) data were analyzed using ANOVA and regression analysis. Results indicated that L*, a*, b*, hue angle and hardness varied with drying conditions for the two banana varieties. The hue angle... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Banana; Luvhele; Mabonde; Oven drying; Optimization. |
| Ano: 2018 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952018000400539 |
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| Grégio,Juliana M.; Caetano,Marco A.L.; Yoneyama,Takashi. |
| Optimal control theory provides a very interesting quantitative method that can be used to assist the decision making process in several areas of application, such as engineering, biology, economics and sociology. The main idea is to determine the values of the manipulated variables, such as drug doses, so that some cost function is minimized, subject to physical constraints. In this work, the cost function reflects the number of CD4+T cells, viral particles and the drug doses. It is worth noticing that high drug doses are related to more intense side-effects, apart from the impact on the actual cost of the treatment. In a previous paper by the authors, the LQR - Linear Quadratic Regulator approach was proposed for the computation of long period... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AIDS; Filtering; Drugs; Mathematical modeling; Optimization. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100002 |
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| MONTON,CHAOWALIT; MADAKA,FAMEERA; SETTHARAKSA,SUKANYA; WUNNAKUP,THANIYA; SUKSAEREE,JIRAPORNCHAI; SONGSAK,THANAPAT. |
| Abstract: The aim of this work was to optimize a maceration condition of cannabis (Cannabis sativa L.). A circumscribed central composite experimental design was applied in this work. Temperature and time were varied from 40-80 °C and 30-90 min, respectively. The three responses (i.e., extraction yield, cannabidiol content, and Δ9- tetrahydrocannabinol content) were predicted by computer software. The yield was high when cannabis was macerated using ethanol at high temperature and long duration time. While cannabidiol and Δ9- tetrahydrocannabinol content was high when macerating at a low heating temperature and short duration time. The optimal condition provided the simultaneous high of cannabidiol and Δ9- tetrahydrocannabinol content was 40 °C for 30 min.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cannabis sativa; Cannabidiol; Δ9-tetrahydrocannabinol; Optimization. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500809 |
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| BARRAGÀN-LUCAS,ANA D.; LLERENA-MIRANDA,CRISTHIAN; QUIJANO-AVILÉS,MARIA FERNANDA; CHÓEZ-GUARANDA,IVÁN A; MALDONADO-GUERRERO,LINDA C.; MANZANO-SANTANA,PATRICIA I.. |
| Abstract: The volume of global gross banana exports reached a record of 117.9 million tonnes in 2015 (FAO 2017), which agro-industrial wastes derived as the pseudo-stem, rachis and leaves do not have an industrial application instead they are discarded. This research study applies full factorial design and response surface methodology to determine the effect of pressing temperature and resin content on density (D), moisture (M), water absorption (WA), water swelling (WS), module of rupture (MOR), module of elasticity (MOE) and formaldehyde content (FC) of particle board made of banana pseudo-stem. A 22 factorial design was performed, factors considered were resin and temperature. The low level of resin was 15% in the coarse fiber (CF) and 35% in fine fiber... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fiber board; Musa paradisiaca; Optimization; Pseudo-stem; Waste. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700903 |
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| Siqueira,Glécio Machado; Dafonte,Jorge Dafonte; González,Antonio Paz; Vázquez,Eva Vidal; Armesto,Monteserrat Valcarcel; Guedes Filho,Osvaldo. |
| ABSTRACT Soil sampling is an important stage of digital soil mapping. The objective of this study was to characterize the spatial design of soil sampling using soil apparent electrical conductivity (ECa) and its optimized spatial sampling. For the characterization, it was used the Spatial Simulated Annealing (SSA) technique, incorporated on the software SANOS 0.1, and the method of response surface sampling design on the software ESAP 2.35. The ECa was measured at 1,887 points in an area of 6 ha located in the northwestern region of Spain. The EM38-DD equipment (Geonics Limited 2005) was used at 2 depths: vertical dipole (1.5 m effective measurement depth) and horizontal dipole (0.75 m effective measurement depth). Semivariogram showed trend for ECa in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Semivariogram; Spatial variability; Optimization; Soil sampling. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000400459 |
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| Xavier,Marcelo Fonseca; Lopes,Toni Jefferson; Quadri,Mara Gabriela Novy; Quadri,Marintho Bastos. |
| The aim of this work was to extract anthocyanins from the red cabbage. Batch studies under several extraction conditions indicated that acetic acid in aqueous solution (10% V/V) was the best solvent, used in the proportion of 0.25 g of red cabbage mL-1. At this condition, column assays were carried out to evaluate the influence of the ionic force, pH, solvent flow rate, recirculated volume of red cabbage juice and the mass of red cabbage. Results showed that the pH, recirculation and mass of red cabbage had statistically significant effects, where the optimum operation conditions found for the process were pH 2.3, recirculation volume of the solvent 0.83 L and mass of red cabbage 50 g. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anthocyanins; Extraction; Red cabbage; Experimental design; Optimization. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100018 |
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| Sambiassi,César; Escalada,Andrea M.; Schmalko,Miguel E.. |
| The objective of this research was the extraction optimization of water soluble compounds of yerba maté. Measures variables were extract concentration and weight of leaves and twigs. Controlled variables were time and temperature of extraction and water/solid relation. A surface response method of three variables was used as experimental design, with 20 experiences in each case. The range of each variable, defined in the experimental design, was: extraction time, 13.2 to 46.8 minutes; temperature, 48.2 to 81.8°C and water solid relation, 4.64 to 11.36 g water/100 g of dry solid. Extract weight varied from 13.14 to 29.56 g in leaves and 8.98 to 16.32 g in twigs (each one per 100 g of dry solid). Extract concentration varied between 2.17 and 3.43 g/100 ml in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Yerba maté; Soluble compounds; Optimization. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200010 |
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| Registros recuperados: 123 | |
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