Search Results - "da Costa, Geraldo Magela"

Quantification of Moisture Contents in Iron and Manganese Ores by costa, Geraldo Magela da, Novack, Kátia Monteiro, Elias, Megg Madonyk Cota, Camila Cristina Rodrigues Ferreira da cunha

“…The moisture contents of several synthetic and natural goethite-bearing samples were determined by the loss-of-mass method and by the Karl-Fischer titration…”
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Influence of drying temperature and atmosphere on the mechanical strength of iron-ore agglomerates and sodium silicates for application in sintering processes by de Castro Dutra, Flávio, Emrich, Marcus, Magela da Costa, Geraldo, Dias, Anderson

“…This paper presents the influence of drying temperature and atmosphere on the mechanical strength of iron‐ore agglomerates and sodium silicates. Mixtures of…”
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PHYTOAVAILABILITY OF COPPER IN INDUSTRIAL BY-PRODUCTS AND MINERAL FERTILIZERS by Souza, Camila Prado Cenciani de, Abreu, Cleide Aparecida de, Cunha, José Francisco da, Costa, Geraldo Magela da, Andrade, Cristiano Alberto de

“…Alternative copper (Cu) sources could be used in fertilizer production, although the bioavailability of copper in these materials is unknown. The objective of…”
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Effect of heat treatment on tourmaline from Brazil by Castañeda, Cristiane, Eeckhout, Sigrid G., Costa, Geraldo Magela da, Botelho, Nilson F., De Grave, Eddy

“…The crystal-chemical behaviour of tourmaline from Araçuaí, Minas Gerais state, Brazil, when subjected to heating in air atmosphere has been studied by several…”
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High temperature oxidation behavior of AISI 304 and AISI 430 stainless steels by Carvalho, Carlos Eduardo Reis de, Costa, Geraldo Magela da, Cota, André Barros, Rossi, Edson Hugo

“…The oxidation behavior of AISI 304 and AISI 430 stainless steels was investigated from 1100 °C up to 1200 °C. Mössbauer spectroscopy and x ray diffraction were…”
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Structural characterization of mullites synthesized by thermal decomposition of topaz by Soares, Robson de Miranda, Sabioni, Antônio Claret Soares, Resck, Inês Sabioni, Falcomer, Viviane Aparecida Silva, Dias, José Alves, Silva, Naira Machado da, Menezes, Sônia Maria Cabral de, Costa, Geraldo Magela da

“…The structure of mullite obtained by thermal decomposition of topaz at 1340 C and after additional thermal treatment at 1600 C was characterised by 29Si and…”
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Vibrational spectroscopy of the mineral meyerhofferite CaB3O3(OH)5·H2O – An assessment of the molecular structure by Frost, Ray L., López, Andrés, Xi, Yunfei, Scholz, Ricardo, Costa, Geraldo Magela da, Belotti, Fernanda M., Lima, Rosa Malena Fernandes

“…[Display omitted] •Meyerhofferite Ca2(H3B3O7)2·4H2O is found in sedimentary or lake-bed borate deposits.•We have studied the Raman and infrared spectra.•We…”
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A Comparative Study of Ultra-Fine Iron Ore Tailings from Brazil by Wolff, Ana Paula, da Costa, Geraldo Magela, de Castro Dutra, Flavio

“…This paper presents a characterization study of ultra-fine solid particles contained in slimes of some iron mines from the Iron Quadrangle, Minas Gerais State,…”
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The use of diffuse reflectance spectroscopy for the characterization of iron ores by da Costa, Geraldo Magela, Barrón, Vidal, Mendonça Ferreira, César, Torrent, José

“…The aim of this work was to develop a diffuse reflectance methodology for quantifying minerals in powdered iron ores, which is a key quality control…”
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Identification and characterization of maghemite in ceramic artifacts and archaeological black earth of Amazon region by Sergio, C.S, Santana, G.P, Costa, G.M. da, Horbe, A.M.C

“…Soil samples representing the surface A1 (0-10 cm) horizon and small pieces of ceramic artifacts of an archaeological black earth from Iranduba district…”
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Magnetic Nanoparticles for in Vivo Use: A Critical Assessment of Their Composition by da Costa, Geraldo Magela, Blanco-Andujar, Cristina, De Grave, Eddy, Pankhurst, Quentin A

“…Three different magnetic samples with particle sizes ranging from 10 to 30 nm were prepared by wet chemical methods. The powders were heated at 100, 150, 200,…”
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Microesferas magnéticas à base de poli(metacrilato de metila-co-divinilbenzeno) obtidas por polimerização em suspensão by Jacira Aparecida Castanharo, Ivana Lourenço de Mello Ferreira, Marcos Antonio da Silva Costa, Manoel Ribeiro da Silva, Geraldo Magela da Costa, Márcia Gomes de Oliveira

“…Microesferas poliméricas à base de metacrilato de metila (MMA), divinilbenzeno (DVB) e material magnético foram preparadas via polimerização por suspensão. Foi…”
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The effect of thermal treatment on the 57Fe Mössbauer spectrum of beryl by da Costa, Geraldo Magela, de Oliveira Polli, Gabriel, Kahwage, Márcio A., de Grave, Eddy, Sabioni, Antônio Claret Soares, Mendes, Júlio Cesar

“…Mössbauer spectra (MS) of blue, green and yellow beryl (ideally Be3Al2Si6O18) containing approximately 1% of iron were obtained at 295 and 500 K. Room…”
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Coprecipitation of aluminum goethite and amorphous al-hydroxy-sulfate using urea and characterization of the thermal decomposition products by da Costa, Geraldo Magela, de Grave, Eddy

“…Aluminum substitution is a common phenomenon in environmental iron oxides and oxyhydroxides, affecting the color, magnetic character, surface features, etc…”
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Refinement of the isomorphic substitutions in goethite and hematite by the Rietveld method, and relevance to bauxite characterisation and processing by Neumann, Reiner, Avelar, Angela Nair, da Costa, Geraldo Magela

“…•Al-for-Fe and OH−-for-O2− substitutions in hematite calculated by Rietveld method.•Agrees with Mössbauer spectroscopy iron distribution in bauxite…”
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Nanocomposite hydrogels based on iota-carrageenan and maghemite: Morphological, thermal and magnetic properties by Maciel, Diana José, Ferreira, Ivana Lourenço de Mello, da Costa, Geraldo Magela, da Silva, Manoel Ribeiro

“…[Display omitted] •The magnetic material synthesized was mainly composed of γ-Fe2O3 (87%).•We prepared magnetic hydrogels based on iota-carrageenan with good…”
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Structural characterization of the borate mineral inyoite – CaB3O3(OH)5⋅4(H2O) by Frost, Ray L., López, Andrés, Scholz, Ricardo, Theiss, Frederick, Costa, Geraldo Magela da

“…•We have studied the mineral Ca(H4B3O7)(OH)⋅4(H2O) or CaB3O3(OH)5⋅4(H2O).•Using a range of techniques including XRD, SEM, EDX, TG and vibrational…”
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Structural characterization of the borate mineral inyoite - CaB sub(3)O sub(3)(OH) sub(5) times 4(H sub(2) O) by Frost, Ray L, Lopez, Andres, Scholz, Ricardo, Theiss, Frederick, da Costa, Geraldo Magela

“…We have studied the mineral Ca(H sub(4)B sub(3)O sub(7))(OH) times 4(H sub(2)O) or CaB sub(3)O sub(3)(OH) sub(5) times 4(H sub(2) O) using electron microscopy…”
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Low-temperature Mössbauer study of heterosite, (Fe, Mn)PO4 by De Grave, Eddy, da Costa, Geraldo Magela, Van Alboom, Antoine, Vandenberghe, Robert Emile

“…[Display omitted] ► Mineral Mössbauer spectroscopy. ► Model-independent magnetic hyperfine-field distributions. ► Complete hyperfine-interaction Hamiltonian…”
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The spectroscopic characterization of the sulphate mineral ettringite from Kuruman manganese deposits, South Africa by Frost, Ray L., López, Andrés, Xi, Yunfei, Scholz, Ricardo, da Costa, Geraldo Magela, Lima, Rosa Malena Fernandes, Granja, Amanda

“…The mineral ettringite has been studied using a number of techniques, including XRD, SEM with EDX, thermogravimetry and vibrational spectroscopy. The mineral…”
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