Factorial Planning
Mostrando 1-12 de 80 artigos, teses e dissertações.
-
1. Separation of gadolinium and europium from chloride media by the solvent extraction technique
Abstract Obtaining rare earth elements (REE) is a complicated task, due mainly to the difficulty of separating and purifying them. Solvent extraction is the most widely used technique for separating REE, and the most common extractants used are organophosphorus acids. The low selectivity of this technique leads to the need for a high number of extraction cel
REM, Int. Eng. J.. Publicado em: 2020-03
-
2. Monitoring the content of ethyl carbamate and copper in organic and conventional cachaça
ABSTRACT: Ethyl carbamate (EC) (NH2COOCH2CH3) is found in cachaça, and its presence in the beverage is conspicuous for its toxicity. Copper, the metal of choice used in the construction of stills, is also considered a beverage contaminant and is often related to the presence of EC in beverages. The study aimed to monitor the quality of cachaça by measuring
Sci. agric. (Piracicaba, Braz.). Publicado em: 20/12/2019
-
3. Factorial design to obtain magnetized poly(ethyl acrylate-co-divinylbenzene)
Abstract Magnetized polymers are produced by incorporating magnetic particles in a polymeric matrix. This article describes the use of the suspension polymerization technique using ethyl acrylate and divinylbenzene as monomers, in the presence of heptane and/or toluene as diluent, initiated by free radicals. To produce the polymer, we first performed fractio
Polímeros. Publicado em: 04/07/2019
-
4. Fatores socioeconômicos, demográficos e de estilo de vida associados a padrões alimentares de trabalhadores em turnos
Resumo O objetivo foi identificar os principais padrões alimentares de trabalhadores em turnos e associá-los às variáveis socioeconômicas, demográficas e de estilo de vida. Foram estudado homens entre 20 a 60 anos, trabalhadores de uma metalúrgica do Ceará. Os padrões alimentares foram identificados por análise fatorial por componentes principais,
Ciênc. saúde coletiva. Publicado em: 2019-03
-
5. Modelo de autoevaluación y heteroevaluación de la práctica docente en Escuelas Normales
Abstract In this article, the topic of teacher evaluation in Normal Schools is addressed. The objective is to present a model of Self-evaluation and Hetero-evaluation of teaching practice in the state of Sonora, Mexico. The study is descriptive and factorial; students, teachers and managers of the Bachelors’ degree in elementary school (2012 plan) of the N
Educ. Pesqui.. Publicado em: 25/06/2018
-
6. Influence of attrition variables on iron ore flotation
Abstract The presence of slimes is harmful to the flotation process: the performance and consumption of reagents are negatively affected. Traditionally, the desliming stage has been responsible for removing slimes. However, depending on the porosity of the mineral particles, desliming may not be sufficient to maximize the concentration results. An attrition
REM, Int. Eng. J.. Publicado em: 2018-03
-
7. Influência da temperatura de molde associada com o uso de fibra de vidro nas propriedades mecânicas e térmicas do nanocompósito (PA6/FV/MMT)
ABSTRACT This work describes the second of a series of studies of the effects of injection molding conditions on the mechanical and thermal properties of Polyamide 6/Glass Fiber/Montmorillonite (PA6/GF/MMT) composites and was motivated by the lack of information about how the processing variables influence on the properties of three-phase composites containi
Matéria (Rio J.). Publicado em: 11/05/2017
-
8. Electrodeposition of Gold Films from a Glycerol Solution on Carbon Paste Electrode and the Effect of Chemical and Electrochemical Parameters of Electrodeposition on the Electrode Performance in Potassium Ferrocyanide Solution
The gold electrodeposition process from a glycerol solution on a carbon paste electrode (CPE) was investigated by voltammetry and the morphologies of the electrodeposits were analyzed by scanning electron microscopy (SEM). Voltammetric study indicated that AuCl4− was reduced to Au0 and the process was mixed controlled (mass transport and electron transfer)
J. Braz. Chem. Soc.. Publicado em: 2017-01
-
9. Chemical Characterization and Optimization of the Extraction Process of Bioactive Compounds from Propolis Produced by Selected Bees Apis mellifera
The extraction process of bioactive compounds from propolis produced by selected bees was optimized using a 2³ factorial design planning to evaluate the effect of ethanol concentration, time and temperature on the extraction of total phenolic compounds and antioxidant activity. Analysis of total flavonoids, antioxidant activity and chemical characterization
J. Braz. Chem. Soc.. Publicado em: 2015-10
-
10. Modulation of antimicrobial metabolites production by the fungus Aspergillus parasiticus
Biosynthesis of active secondary metabolites by fungi occurs as a specific response to the different growing environments. Changes in this environment alter the chemical and biological profiles leading to metabolites diversification and consequently to novel pharmacological applications. In this work, it was studied the influence of three parameters (ferment
Braz. J. Microbiol.. Publicado em: 2014
-
11. Emprego de ferramentas estatísticas para avaliação da usinabilidade de ligas de alumínio
The main objective of the present work is to study the effect of the input variables: mechanical properties of the workpiece (tensile strength, hardness and elongation) and cutting conditions (cutting speed, feed rate, depth of cut and lubri-cooling system) over the output variables: cutting forces, power consumption, cutting temperature, surface roughness (
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/05/2012
-
12. La medición de la capacidad de resolución de problemas en las ciencias experimentales
This paper presents a study about the design of a test to measure solving problem capacities using the technique of factorial analysis. The instrument yielded a Cronbach's alpha (α) of 0.76, and 16 items distributed in 7 factors ordered according to the percentage which explained the variance in this capacity: prediction and transfer, synthesis, critical de
Ciênc. educ. (Bauru). Publicado em: 2012