Results 21 to 30 of about 58,109 (251)
Microstructural optimization of unalloyed ductile cast irons with a ferritic matrix used in the manufacture of wind turbine rotors [PDF]
, 2018 The aim of this work was the microstructural optimization of cast irons with nodular graphite for the manufacture of wind turbine hubs, paying preferential attention to the geometry and distribution of graphite spheroids to ensure the required mechanical
Asensio Lozano, Juan +2 more
core +7 more sources
, 2005 Le seul objet en métal recueilli à Tamtok est un petit GRELOT en « bronze » à l’arsenic. Ce grelot qui fut trouvé dans des déblais, avait sans doute été fondu sur place, à la cire perdue, car il contenait encore la partie interne de son moule, fait d’argile et de graphite.
Guy Stresser-Péan +1 more
openalex +3 more sources
Journal of Nanomaterials, Volume 2022, Issue 1, 2022., 2022 Mesoporous zinc oxide microparticles were synthesized by the sol‐gel method, followed by hydrothermal treatment at three different temperatures (100°C, 120°C, and 140°C), confirming that the method is fast, simple, reproducible, and ecological. To carry out the synthesis of the samples, zinc acetate was used as a precursor and sodium hydroxide as a ...
B. Murguía +5 more
wiley +1 more source
Revisiting a place‐based policy: Transformations in Northeast Brazil
Growth and Change, Volume 52, Issue 4, Page 2412-2436, December 2021., 2021 Abstract Despite being the second most populated region in Brazil, the Northeast has persistently accounted for a small share of national income. A well‐known attempt to develop the region was made in 1959 with the creation of SUDENE, a big push type of place‐based policy resulting in an intensification of industrial investments.
Solmaria Halleck Vega
wiley +1 more source
Ultrafast reaction‐sintering of grain size‐controlled titanium niobate from TiO2 and Nb2O5
International Journal of Ceramic Engineering &Science, Volume 3, Issue 6, Page 272-278, November 2021., 2021 Herein we present a fast‐firing approach to the solid‐state synthesis, yielding TiNb2O7 phase in less than 2 min, starting from tape‐cast titania (d50 = 0.26 μm) and niobia (d50 = 0.967 μm) green compacts. Besides significantly reducing processing time, fast‐firing enabled the hindering of grain growth, producing a material with grain size ∼0.5 μm ...
Vinícius S. G. Oliveira +3 more
wiley +1 more source
Developmental Science, Volume 24, Issue 6, November 2021., 2021 Abstract Poverty and teenage pregnancy are common in low‐and‐middle‐income countries and can impede the development of healthy parent‐child relationships. This study aimed to test whether a home‐visiting intervention could improve early attachment relationships between adolescent mothers and their infants living in poverty in Brazil.
Fernanda Speggiorin Pereira Alarcão +11 more
wiley +1 more source
Hydrometallurgical extraction of Al and Si from kaolinitic clays [PDF]
, 2017 Herein is presented the results of a study on the hydrometallurgic extractionand recovery of aluminum and silicon by leaching of kaolinitic clays with HF. Thestudied extraction parameters were: temperature, reaction time, solid/liquid ratio,concentration,
Pinna, Eliana Guadalupe +3 more
core +3 more sources
Emissions from pre-Hispanic metallurgy in the South American atmosphere [PDF]
, 2014 Peer reviewedPublisher ...
De Vleeschouwer, François +7 more
core +7 more sources
Advanced Sustainable Systems, Volume 4, Issue 10, October 2020., 2020 The hydrodeoxygenation of lignocellulose‐derived alkylphenols is a possible route to bio‐based aromatic hydrocarbons. In this work, a Pt/Nb2O5 catalyst is shown to be highly active and selective in the hydrodeoxygenation of propylphenols, with up to 77% propylbenzene selectivity. Furthermore, the isomerism of propylphenol, the vapor–liquid equilibrium,
José Luis González Escobedo +6 more
wiley +1 more source