Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Otávio da Fonseca Martins Gomes"'
Autor:
Antonieta Middea, Luciana dos Santos Spinelli, Fernando Gomes de Souza Junior, Thais de Lima Alves Pinheiro Fernandes, Luiz Carlos de Lima, Vitoria Maria Tupinamba Souza Barthem, Otávio da Fonseca Martins Gomes, Reiner Neumann
Publikováno v:
Mining, Vol 4, Iss 1, Pp 37-57 (2024)
This work focuses on the characterization of five palygorskite clays from the Brazilian state of Piaui and their feasibility as eco-friendly adsorbents for the removal of Fe3+ ions from aqueous solutions. For characterization, we applied the techniqu
Externí odkaz:
https://doaj.org/article/3cf5fc6fef9742cfb103ff0c80636b85
Autor:
Julio César Álvarez Iglesias, Karen Soares Augusto, Otávio da Fonseca Martins Gomes, Alei Leite Alcântara Domingues, Maria Beatriz Vieira, Catia Casagrande, Sidnei Paciornik
Publikováno v:
Journal of Materials Research and Technology, Vol 7, Iss 3, Pp 376-380 (2018)
This paper presents an automatic system for mineralogical and textural characterization of iron ores based on digital microscopy and image analysis. It employs a motorized and computer-controlled reflected light microscope in a correlative approach t
Externí odkaz:
https://doaj.org/article/4b3bdfd4bb534151b7716bc8adfad7f1
Autor:
Reynel Martinez Castellanos, Julio César Álvarez Iglesias, Otávio da Fonseca Martins Gomes, Karen Soares Augusto, Sidnei Paciornik
Publikováno v:
REM: International Engineering Journal, Vol 71, Iss 2, Pp 209-215
Abstract A correlative approach employing optical microscopy and scanning electron microscopy is proposed for the quantification of phases and pores in iron ore pellets. Combining mosaic images covering the full cross-sections of pellets, obtained wi
Externí odkaz:
https://doaj.org/article/69f760abd1464eec8230c80abddc916f
Autor:
Alexis Jair Enríquez-León, Francisco Thiago Sacramento Aragão, Lilian Ribeiro de Rezende, Leni Figueiredo Mathias Leite, Otávio da Fonseca Martins Gomes, Thiago Delgado de Souza, Lucas Henrique Vieira
Publikováno v:
Transportation Research Record: Journal of the Transportation Research Board. 2675:166-179
The fine aggregate matrix (FAM) is an important constituent of an asphalt concrete mixture; the FAM is where some key damage phenomena such as cracking start and propagate. The proper design and fabrication of isolated FAM testing samples that are re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f92bf29c13e9399967d9537db0384a27
https://doi.org/10.1177/0361198121994856
https://doi.org/10.1177/0361198121994856
Autor:
Romildo Dias Toledo Filho, Aline de Souza Oliveira, Otávio da Fonseca Martins Gomes, Jo Dweck, Eduardo de Moraes Rego Fairbairn
Publikováno v:
Journal of Thermal Analysis and Calorimetry. 139:3361-3375
Crystalline admixtures (CAs), categorized as permeability-reducing admixtures, are commercial products employed in low contents in cement-based materials either to improve concrete durability or to stimulate autogenous healing of cracks. This study i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b27beaa2ceb7ca2816a471e59f28e70
https://doi.org/10.1007/s10973-019-08745-0
https://doi.org/10.1007/s10973-019-08745-0
Autor:
Otávio da Fonseca Martins Gomes, Neven Ukrainczyk, Dimas Alan Strauss Rambo, Romildo Dias Toledo Filho, Flávio de Andrade Silva, Eddie Koenders
Publikováno v:
Cement and Concrete Composites. 96:212-224
The effect of elevated temperatures on a calcium aluminate mortar with clinker aggregates is the subject of this paper. After an exposure period of 3 h at temperatures ranging from 25 to 1000 °C, specimens were tested in residual conditions in order
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99862196c3900c2b050900ee731b4fd6
https://doi.org/10.1016/j.cemconcomp.2018.12.002
https://doi.org/10.1016/j.cemconcomp.2018.12.002
Publikováno v:
BioResources. 14:1494-1511
The influence of elevated temperatures on mechanical behavior was studied for curaua, hemp, and sisal natural fibers. Tensile tests were performed on fibers heated at 100 °C, 150 °C, and 200 °C for 24 h, and reference samples were maintained witho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66f72cc2368fadf5e1c912a194b6658e
https://doi.org/10.15376/biores.14.1.1494-1511
https://doi.org/10.15376/biores.14.1.1494-1511
Publikováno v:
Minerals, Vol 11, Iss 346, p 346 (2021)
Minerals
Volume 11
Issue 4
Minerals
Volume 11
Issue 4
Maghemite (γ-Fe2O3) is a mineral formed from magnetite oxidation at low temperatures, an intermediate metastable term of the magnetite to hematite oxidation and could be mixed with both. It has magnetic susceptibility similar to magnetite, crystal s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::62a6f712b45fded29ee75719e6b3762e
https://www.mdpi.com/2075-163X/11/4/346
https://www.mdpi.com/2075-163X/11/4/346
Autor:
Adilson Brito de Arruda Filho, Paulo Roberto Lopes Lima, Ricardo Fernandes Carvalho, Otavio da Fonseca Martins Gomes, Romildo Dias Toledo Filho
Publikováno v:
Textiles, Vol 4, Iss 1, Pp 40-56 (2024)
The use of fabric in reinforcing cement-based materials expands their applications for various types of construction elements. Additionally, employing renewable sources of plant-based fabrics contributes to reducing the environmental impact of the co
Externí odkaz:
https://doaj.org/article/77092d2fea764cc29b43764ab82b9072
Autor:
Otávio da Fonseca Martins Gomes, Julio César Álvarez Iglesias, Alei Leite Alcântara Domingues, Sidnei Paciornik, Catia Casagrande, Maria Beatriz Vieira, Karen Soares Augusto
Publikováno v:
Journal of Materials Research and Technology, Vol 7, Iss 3, Pp 376-380 (2018)
This paper presents an automatic system for mineralogical and textural characterization of iron ores based on digital microscopy and image analysis. It employs a motorized and computer-controlled reflected light microscope in a correlative approach t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16c5bd778a76d6c0b28c3b9777da3255
http://www.sciencedirect.com/science/article/pii/S2238785417308025
http://www.sciencedirect.com/science/article/pii/S2238785417308025