Fractional Factorial Design
Mostrando 25-36 de 56 artigos, teses e dissertações.
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25. Influence of process conditions on the physicochemical characteristics of cumaru (Amburana cearensis) powder produced by spray drying
The aim of the work was to study the spray-drying of ethanolic extract from Amburana cearensis (Allemão) A.C. Sm., Fabaceae, in order to obtain powders with better pharmacological and technological properties for herbal medicine. A 2³ fractional factorial statistical design was used to find adequate spray-drying operating conditions (inlet air temperature;
Rev. bras. farmacogn.. Publicado em: 04/12/2012
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26. Dynamic maceration of Copaifera langsdorffii leaves: a technological study using fractional factorial design
The Copaifera langsdorffii Desf., Fabaceae, is a Brazilian native tree, known as copaiba, which oil is commonly used in folk medicine as muscle relaxant, wound healing, antiseptic and anti-inflammatory to respiratory and urinary tracts. Despite of the wide use of the oil of Copaifera species, scientific works related to the study of its leaves are rarely fou
Rev. bras. farmacogn.. Publicado em: 09/10/2012
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27. Evaluation of biomass production, carotenoid level and antioxidant capacity produced by Thermus filiformis using fractional factorial design
A fractional factorial design 2(5-1) was used to evaluate the effect of temperature, pH, and concentrations of yeast extract, tryptone and Nitsch's trace elements on the biomass, total carotenoids and protection against singlet oxygen by carotenoid extracts of the bacterium Thermus filiformis. In addition, the carotenoid composition was determined by high-pe
Brazilian Journal of Microbiology. Publicado em: 2012-03
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28. Analysis of semi-solid processing for metal matrix composite synthesis using factorial design
The main goal in this work is to conduct a quantitative analysis of the mechanical stir casting process for obtaining particulate metal matrix composites. A combined route of stirring at semi-solid state followed by stirring at liquid state is proposed. A fractional factorial design was developed to investigate the influence and interactions of factors as: t
Materials Research. Publicado em: 31/01/2012
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29. Desempenhos dos fatoriais fracionados em estimar efeitos principais na presença de interações duplas / Performance of fractional factorial to estimate main effects in the presence of double interactions
O presente trabalho avaliou, por meio da simulação de dados, os desempenhos dos fatoriais fracionados de resoluções III, IV e V, do delineamento de Cotter (1979) e do método UFPV, para estimar os efeitos principais dos fatores estudados sobre uma resposta, na presença ou não de apenas interações duplas entre eles. Para tanto, foram estimados os efei
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011
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30. Growth characteristics modeling of Bifidobacterium bifidum using RSM and ANN
The aim of this work was to optimize the biomass production by Bifidobacterium bifidum 255 using the response surface methodology (RSM) and artificial neural network (ANN) both coupled with GA. To develop the empirical model for the yield of probiotic bacteria, additional carbon and nitrogen content, inoculum size, age, temperature and pH were selected as th
Brazilian Archives of Biology and Technology. Publicado em: 2011-12
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31. Produção de gás de síntese a partir da glicerina / Syngas production from glycerol
Biodiesel (alkyls esters) is a clean burning fuel derived from renewable lipid feedstock such as vegetable oil or animal fat. Glycerin is a by-product from the biodiesel production which represents nearly 10% of product total mass. As the biodiesel production is increasing there exist incentives to use the glycerin as raw material for other processes. The gl
Publicado em: 2010
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32. Investigação das condições de crescimento e produção de metabólitos secundários das linhagens de fungos Penicillium citrinum e Penicillium oxalicum / Investigation of conditions for growth and production of secondary metabolites of fungi strains P. citrinum and P. oxalicum
In this study, two species of fungi isolated from the marine environment had their active extracts against Staphylococcus aureus and Candida albicans to a strain of P. citrinum, and activity cytotoxic and against Mycobacterium tuberculosis to a strain of P. oxalicum. This studied aims the optimization their growth conditions for the production of secondary m
Publicado em: 2010
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33. Statistical optimization of culture conditions by response surface methodology for synthesis of lipase with Enterobacter aerogenes
Optimization of lipase production by Enterobacter aerogenes was carried out using response surface methodology (RSM) where the statistical model was obtained by fractional factorial central composite design. The influence of various physico-chemical parameters, viz. temperature, oil concentration, inoculum volume, pH and incubation period on lipase productio
Brazilian Archives of Biology and Technology. Publicado em: 2009-12
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34. Study of the acetic bacteria nutritional necessity for the acid production / Estudo das necessidades nutricionais de bacterias aceticas para a produção de acido acetico
The acetical bacteria are used in vinegar production. The nutritional requirement of acetical bacteria is poorly known, and the maintenance of these microorganisms is too difficult. The reactors of submerged acetical fermentation promote conditions of physiologic stress: acidity (up to 10% p/v), alcohol (2%p/v) and oxygenation (0,4 vvm).These parameters are
Publicado em: 2009
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35. Otimização da metodologia de determinação voltamétrica dos isômeros do ácido butenodióico / Optimization of the methodology for determing voltammetry the butanedioic acid
O ácido butenodióico apresenta-se sob a forma de dois isômeros geométricos: o ácido fumárico e o ácido maleico. A ocorrência natural destes ácidos em sucos de maçã em níveis maiores que 3 mg.L-1 pode ser devida ao metabolismo de alguns fungos ou bactérias presentes na própria maçã. O ácido fumárico e o ácido maleico são reduzidos eletroqu
Publicado em: 2009
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36. Productions of ethyl esters (biodesel) from the transesterification core residual oil / Produção de esteres etilicos (biodiesel) a partir da transesterização basica de oleo residual
Biodiesel (alkyl esters) is a clean burning fuel derived from a renewable lipid feedstock such as vegetable oil or animal fat. It is biodegradable, non-inflammable, nontoxic and produce much lesser COx, sulfur dioxide and unburned hydrocarbons than petroleum-based diesel. Nowadays, due to the price of virgin oil such as soybean and canola oils, the use of lo
Publicado em: 2008