Zobrazeno 1 - 10
of 275
pro vyhledávání: '"hematita"'
Publikováno v:
Minería y Geología, Vol 37, Iss 1, Pp 1-29 (2021)
One of the main mineral resources of the Republic of Angola is iron formation; however, just some studies refer to formation containing banded iron known as BIF (Banded Iron Formation). This article focuses on the mineralogical characterization, by m
Externí odkaz:
https://doaj.org/article/fc068c68ff5c4f3aba5a9859fa74b7e5
Autor:
Juan Pablo Ogalde Herrera, Freddy Viñales, Claudia Ogalde, Nelson Lara, Bernardo Arriazza, Carolina Paipa, Patricio Leyton, Marcelo Campos-Lavallette
Publikováno v:
Estudios Atacameños, Vol 68 (2022)
Aquí se presentan los resultados de los análisis de espectroscopía Raman e Infrarroja de pigmentos rojos provenientes de dos contextos fúnebres del cementerio de Topater-1, además de otras dos muestras, una del sector San Salvador y otra sin ref
Externí odkaz:
https://doaj.org/article/d88ee9bd04d8446792f54636d64ea35e
Publikováno v:
Momento, Vol 0, Iss 56, Pp 63-75 (2018)
A magnetic study about the thermal transformation of hematite doped with CuO (Fe2O3 + CuO) is presented. The heat treatment was carried out at a temperature of 375 ± 1 ºC, in a controlled atmosphere composed by 20% hydrogen and 80% nitrogen. Sample
Externí odkaz:
https://doaj.org/article/0925bd90430345fb965f9c1e37bca47a
Publikováno v:
Ingeniería Investigación y Desarrollo, Vol 16, Iss 2, Pp 84-93 (2016)
In this paper we analyze clay samples obtained from the region of Tunja Boyacá to study the effect of heating temperature in the color of these materials and at the same time as indicative of the nature and distribution of constituents iron oxide Fe
Externí odkaz:
https://doaj.org/article/e7727f38b4984a77982086d19d7b9996
Publikováno v:
Ciência Rural, Vol 48, Iss 8 (2018)
ABSTRACT: Iron oxides are environmental indicators and influence on physical and chemical behavior of soils. This research aimed to identify and characterize pedogenic iron oxides in soils of the Acre state, Brazil. The soils developed from sedimenta
Externí odkaz:
https://doaj.org/article/16f26b971f244ef4a6f61c5206fe1fb7
Publikováno v:
Revista Brasileira de Ciência do Solo, Vol 39, Iss 4, Pp 940-949 (2015)
Na unidade geomorfológica dos Tabuleiros Costeiros dominam os solos com horizontes coesos, e alguns deles têm a presença de horizontes cimentados comumente do tipo fragipã. Esses horizontes interferem na dinâmica da água, no crescimento de raí
Externí odkaz:
https://doaj.org/article/2100fa337b4148ea8d7b5559ebe2a151
Publikováno v:
Arqueología Iberoamericana, Vol 47, Pp 145-152 (2021)
Amostras representativas dos ocres vermelhos e amarelados do sítio arqueológico Entrada do Caminho da Caiçara, Piripiri-Piauí-Brasil, foram analisadas por fluorescência de raios X por dispersão de energia (EDXRF), espectroscopia de absorção n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doajarticles::d4ba81c39496d5aa6262d619bb2bb9a4
https://www.laiesken.net/arqueologia/archivo/2021/4715
https://www.laiesken.net/arqueologia/archivo/2021/4715
Publikováno v:
Revista Brasileira de Ciência do Solo, Vol 37, Iss 2, Pp 295-306 (2013)
A good knowledge of the spatial distribution of clay minerals in the landscape facilitates the understanding of the influence of relief on the content and crystallographic attributes of soil minerals such as goethite, hematite, kaolinite and gibbsite
Externí odkaz:
https://doaj.org/article/fe4c00a01c644188aad388ef98795a38
Publikováno v:
Momento, Vol 0, Iss 46, Pp 28-37 (2013)
The development of magnetic nanoparticles by ACCVD is a powerful technique to synthesize material with high purity. The size and composition of magnetic nanoparticles was tailored, by variation of the flow ratio Ar-Air and furnace temperature. Differ
Externí odkaz:
https://doaj.org/article/7db89f0401824c26942a2aa481cdc304
Autor:
João Fernandes da Silva Junior, José Marques Júnior, Livia Arantes Camargo, Daniel De Bortoli Teixeira, Alan Rodrigo Panosso, Gener Tadeu Pereira
Publikováno v:
Revista Brasileira de Ciência do Solo, Vol 36, Iss 6, Pp 1690-1703 (2012)
Os minerais da fração argila, goethita e hematita, são óxidos de ferro (Fe) indicadores pedoambientais com grande influência nos atributos físicos e químicos do solo. O conhecimento dos padrões espaciais desses óxidos auxilia a compreensão
Externí odkaz:
https://doaj.org/article/84e281d5733b48a4bb036526da885acc