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Wyszukujesz frazę "Pires, C. S." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Geoelectric method applied in correlation between physical characteristics and electrical properties of the soil
Autorzy:
Filho, A. M. S.
Silva, C. L. B.
Oliveira, M. A. A.
Pires, T. G.
Alves, A. J.
Calixto, W. P.
Narciso, M. G.
Powiązania:
https://bibliotekanauki.pl/articles/136150.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
geoelectrical prospecting
apparent
electrical resistivity
soil compaction
moisture content
Opis:
This paper presents the study of the relationship between electrical properties and physical characteristics of the soil. Measures of apparent electrical resistivity of the soil were made for different types of soil, varying moisture content gradually while maintaining a constant compaction, and then varying the compaction and relating it to a constant humidity. Development of a correlation surface is proposed in order to identify granulometry of the soil from moisture and compaction measurements. For the study of spatial variability, two areas were chosen to allow the change of moisture content and compaction in order to verify the measurement capacity of apparent electrical resistivity of the soil as methodology to identify change in soil dynamics. Results obtained show correlations among apparent electrical resistivity of the soil, moisture, soil compaction and clay content.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 2; 37-44
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Froth flotation of Aljustrel sulphide complex ore
Autorzy:
Sousa, R.
Futuro, A.
Pires, C. S.
Leite, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/109732.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
froth flotation
mineral liberation
flotation reagents
complex sulphide ore
Opis:
Froth flotation of copper-zinc-lead ores is a complex process based on similar metallurgy processing and strong interactions between chalcopyrite and sphalerite. These types of ores represent 15% of the world production and 7.5% of copper deposits all over the world. In the present study, an attempt is made to assess the feasibility of froth flotation of a complex sulphide ore, where the effect of liberation grade as well as depressant, collector and frother dosage was studied. Copper flotation is dependent on the mineral liberation grade, which is significantly related with the size distribution. It was shown that longer grinding time increased the Cu grade but decreased the copper recovery due to the presence of very fine particles. Lime and sodium metabisulphite, used as depressants, allowed to achieve a good flotation performance. It was shown that for this type of ore lower dosage of the collector should be applied. Finally, a higher frother dosage led to a greater selectivity and reduced entrainment of very fine particles, but also caused low kinetic ratio and low recovery of valuable minerals. A well-defined flotation objective was imperative for a good liberation grade and reagents dosage selection, mainly for complex sulphide ores. A useful contribute was given to a better technical understanding of flotation of a complex sulphide ore from the Moinho deposit.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 758-769
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of grounding grids parameter at arbitrary geometry
Autorzy:
Silva, C. L. B.
Pires, T. G.
Calixto, W. P.
Oliveira, D. N.
Souza, L. A. P.
Filho, A. M. S.
Powiązania:
https://bibliotekanauki.pl/articles/136173.pdf
Data publikacji:
2017
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
grounding grids parameters
Heppe
soil stratified in two layers
Opis:
This paper deals with the computation of ground resistance, surface voltage, touch voltage and step voltage, to mesh with horizontal wires arranged in different angles. The computer program implemented used in the mathematical modeling is based on the method proposed by Heppe, which allows obtaining the grounding parameters for homogeneous soil and soil stratified in two layers. The results obtained with the proposed method will be compared with other methods in literature. Also will be presented the results of a grounding grid using wires at various angles.
Źródło:
Transactions on Environment and Electrical Engineering; 2017, 2, 2; 11-17
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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