Mixtures Designs
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Decomposition and Nutrient Release of Cover Crops in Mango Cultivation in Brazilian Semi-Arid Region
ABSTRACT Knowledge of the decomposition dynamics of aboveground phytomass and its release of nutrients in mixtures of cover crops as well as the impact on the soil tillage system is fundamental for the sustainable management of agroecosystems. This work aimed to evaluate whether soil tillage and the choice of cover crops cultivated in the interrows can be te
Rev. Bras. Ciênc. Solo. Publicado em: 29/04/2019
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2. Otimização da etapa de extração do ácido clavulânico presente no caldo de fermentação utilizando misturas de solventes
The purpose of this work was to study four different solvent mixtures intended to increase the yield of the extraction stage of clavulanic acid (CA), which is one of the steps in the purification process. Four central composite rotatable designs (CCRD) were utilized to optimize the solvent mixtures. The variables selected for the factorial design were solven
Quím. Nova. Publicado em: 2014
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3. Enthalpy of mixing and heat of vaporization of ethyl acetate with benzene and toluene at 298.15 k and 308.15 k
The present work was carried out in two phases. First, enthalpy of mixing was measured and then the heat of vaporization for the same mixtures was obtained. The data are useful in the design of separation equipments. From the various designs available for the experimental determination of enthalpy of mixing, and heat of vaporization, the apparatus was select
Brazilian Journal of Chemical Engineering. Publicado em: 2008-03
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4. Influência de agentes controladores de processo na síntese por combustão mecanicamente ativada do NbAL3 / INFLUENCE OF PROCESS CONTROL AGENTS ON THE MECHANICALLY ACTIVATED COMBUSTION SYNTHESIS OF NbAl3
In this work, the influence of some process control agents (stearic acid, ethanol, methanol and cyclohexane) in the mechanical activation of powder mixtures of 25% at. niobium and 75% at. aluminum (stoichiometry of the intermetallic compound NbAl3) followed by combustion synthesis reaction, was investigated. The process control agents (PCA) were added to the
Publicado em: 2008
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5. Influência da composição da fase móvel e meio extrator na qualidade da impressão digital cromatográfica da Bauhinia variegata L. por planejamento estatístico
The performance of a chromatographic fingerprint obtained is closely dependent on the chromatographic separation degrees and concentration distributions of all the chemical components in herbal medicines. The purpose of this work is to investigate the influence of different solvents on the extraction medium and the mobile phase strength of reversed-phase liq
Publicado em: 2007
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6. Optimization of process and mixture variables in high performance liquid chromatography / Otimização simultanea de variaveis de processo e mistura em cromatografia liquida de alta eficiencia
Este trabalho teve como objetivo o desenvolvimento de modelos combinados considerando simultaneamente o tipo de Fase Estacionária (FE) como variável de processo e diferentes composições de Fase Móvel (FM) como variáveis de mistura para descrever a influência de cada uma destas variáveis, bem como a interação entre elas, na separação de diversos c
Publicado em: 2007
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7. Multidimensional modelling and calculation of combustion in porous media
In contrast with household heating systems based on open combustion flames, burners based on premixed combustion in inert porous media are characterized by higher thermal efficiency and high turndown ratio allied with compacity of the units. Moreover, porous burners, where a flame is anchored inside a porous matrix, are associated with low pollutants formati
Publicado em: 2005
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8. Influence evaluation of some factors in the mechanical properties of binder mixtures using design and analysis of asymmetric fractional factorial experiments technique / Avaliação da influência de alguns fatores nas propriedades mecânicas de misturas asfálticas densas, à luz da técnica de planejamento e análise de experimentos fatoriais fracionários assimétricos
This work deals with the influence of some factors in the mechanical behavior of asphalt mixtures stability and flexibility. Three types of binders were tested, conventional one, modified with 4,5% of SBS and modified with 20% of recycled tire rubber. Two aggregate gradations were tested, center of B and C gradations of DNER (1997). Four binder contents were
Publicado em: 2004