Gravimetric Method
Mostrando 13-24 de 91 artigos, teses e dissertações.
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13. New Synthesis Method for a Core-Shell Composite Based on α-Bi2O3 @PPy and its Electrochemical Behavior as Supercapacitor Electrode
New composite based on polypyrrole (PPy) and bismuth oxide (α-Bi2O3) was investigated as supercapacitor electrode. The α-Bi2O3 was obtained by hydrothermal route at 500 ºC for 2 h. Cyclic voltammetry was used to electropolymerize PPy on graphite electrode (GE) or on GE/α-Bi2O3. The X-ray diffraction profile of Bi2O3 revealed the α-Bi2O3 monoclinic struc
J. Braz. Chem. Soc.. Publicado em: 2019-04
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14. Response of the TDR sensor to moisture under different types of management of a typical Latosol in the Cerrado
RESUMO A técnica de Reflectometria no Domínio do Tempo (TDR) tem se destacado na avaliação da umidade do solo, por ser um método instantâneo, não destrutivo, preciso e pouco dependente dos fatores ambientais. Porém, pesquisadores têm enfatizado a necessidade de calibração específica e contínua para cada condição de manejo do solo. Portanto, ob
Rev. Ciênc. Agron.. Publicado em: 2019-03
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15. Leaf area estimate of Pennisetum glaucum by linear dimensions
ABSTRACT. Leaf area measurements are of the main parameters used in agronomic studies to evaluate plant growth. The current study used a non-destructive method based on linear leaf dimensions (length and width) to select the regression model to estimate millet (Pennisetum glaucum) leaf area. For two millet genotype (IPA BULK 1 BF and ADR 300) 128 randomly-ch
Acta Sci., Anim. Sci.. Publicado em: 25/02/2019
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16. Biology of non-native species (Rhaphiodon vulpinus Agassiz, 1829) (Characiformes, Cynodontidae) in a cage fish farm area, Upper Paraná River Basin, Brazil
Resumo Objetivo Verificar os aspectos alimentares, populacionais e parasitológicos da espécie de peixe silvestre não-nativa Rhaphiodon vulpinus em área sob influência de uma piscicultura em tanques-redes, no reservatório de Ilha Solteira, São Paulo. Métodos Cinquenta e um exemplares de R. vulpinus foram capturados entre setembro de 2014 e agosto
Acta Limnol. Bras.. Publicado em: 18/02/2019
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17. Prediction of Properties of Sclerolobium paniculatum and Qualea grandiflora Charcoal
ABSTRACT There is a lack of techniques for the rapid and accurate determination of wood quality for charcoal production with good energy characteristics. The association of NIR spectroscopy and important charcoal parameters allows the prediction of these characteristics. This is a fast method that does not require sample preparation before the reading. The
Floresta Ambient.. Publicado em: 14/02/2019
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18. Study of adsorption isotherms and physicochemical characterization of natural food colourants
Abstract Synthetic colourants are widely used for colouring foods. However, their safety has been questioned. Due to this limitation and the global trend of consuming healthy foods, the industry is faced with the need to replace artificial colourings, which has given rise to a growing interest in colourants from natural sources. Thus, this work obtained the
Food Sci. Technol. Publicado em: 31/01/2019
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19. Water sorption isotherms of cooked hams as affected by temperature and chemical composition
Abstract This study was focused on the determination of the chemical composition and experimentally obtaining the sorption isotherms for four samples of commercial cooked ham subjected to simulated commercial storage conditions. The isotherms were determined using the gravimetric method. The mathematical models of Guggenhein, Anderson and de Boer; Brunauer,
Food Sci. Technol. Publicado em: 13/12/2018
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20. Matéria Evaluation of zinc oxide nanoparticles influence on hydrophilic polymer matrix systems
ABSTRACT Hydrophilic polymer matrix systems (HPMSs) are a highly relevant tool for drugs delivery whose bioavailability is impaired by low hydrosolubility. Besides this, when associated with nanoparticles these systems can provide better control over release profile of the active drug, maintaining the posology. Since polyvinylpyrrolidone (PVP) and zinc oxide
Matéria (Rio J.). Publicado em: 06/12/2018
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21. Buriti of the cerrado of Minas Gerais, Brazil: physical and chemical characterization and content of carotenoids and vitamins
Abstract The fruit species of the Brazilian Cerrado, such as buriti (Mauritia vinifera ), occupy a prominent position in the ecosystem since they contribute to the economic potential of the region and have high nutritional value. We aimed to evaluate the physical characteristics, chemical composition and content of vitamin C, carotenoids, vitamin E and fola
Food Sci. Technol. Publicado em: 30/07/2018
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22. THERMODYNAMIC PROPERTIES OF SORPTION OF RICE IN THE HUSK
ABSTRACT This study aimed to determine the thermodynamic properties of sorption processes (desorption and adsorption) of rice in the husk, cv. Urucuia. A static-gravimetric method was used to reach equilibrium moisture content at different temperatures (10, 20, 30, 40, and 50 °C ± 1°C) and relative humidity levels (10, 30, 50, 70, and 90 % ± 2%). A decre
Eng. Agríc.. Publicado em: 2018-06
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23. Solvothermal Reduction of Graphite Oxide Using Alcohols
In the present work, we use either ethanol or ethylene glycol as reducing agents through the solvothermal method for graphite oxide reduction. A sulfuric acid treatment before the reduction process was also applied to evaluate its influence on the epoxy group ring-opening reaction. Reduced graphene oxide (RGO) samples were obtained with morphology like crump
Mat. Res.. Publicado em: 18/12/2017
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24. Severe Plastic Deformation and Additive Distribution in Mg-Fe to Improve Hydrogen Storage Properties
Magnesium (Mg) is a light metal with relatively low cost. Its hydride (MgH2) is interesting for the safe hydrogen storage in solid state and has a high gravimetric capacity of 7.6%. Practical application of Mg is still hampered by high reaction temperatures and slow kinetics. In order to improve it and focus on more viable industrial processing conditions, M
Mat. Res.. Publicado em: 30/10/2017