Crystalline Iron
Mostrando 13-24 de 63 artigos, teses e dissertações.
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13. Conversion of sandy tailing from banded iron formation exploitation into glass-ceramic materials
Glass-ceramic materials made of 40.0 wt. (%) of sandy tailing from banded iron formation exploitation and 60 wt. (%) of slag from steelwork were analyzed. Vitrification was obtained by heating the batch samples up to 1400 °C for 1 hour and quenching the melt on a stainless steel plate. Devitrification was obtained by heat-treating the as-quenched glass samp
Materials Research. Publicado em: 13/12/2011
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14. Photocatalytic discoloration of reactive blue 5g dye in the presence of mixed oxides and with the addition of iron and silver
This work reports the use of cerium - titania - alumina - based systems modified with Ag and Fe by the wetness impregnation method for the discoloration of blue 5G dye. The techniques employed to characterize the photocatalysts were: temperature - programmed reduction (TPR), X - ray diffraction (XRD), specific surface area, average pore volume, and average p
Brazilian Journal of Chemical Engineering. Publicado em: 2011-09
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15. Disponibilidade de cobre, ferro, manganês e zinco em solos sob pastagens na Região do Cerrado
Este trabalho teve como objetivo descrever os teores totais e disponíveis de cobre, ferro, manganês e zinco e suas relações com a acidez, fertilidade, textura e mineralogia de latossolos sob pastagens na Região do Cerrado. Os solos estudados foram amostrados em três regiões: às margens das rodovias GO-060 e BR-154, entre os municípios de Goiânia, G
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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16. Processos hidrogeoquÃmicos em Ãguas subterrÃneas no cristalino em Caucaia/CE. ContribuiÃÃo da modelagem inversa atravÃs do PHREEQC. / Hydrogeochemical processes in groundwater in the crystalline Caucaia / CE. Contribution from inverse modeling by PHREEQC
The interaction between groundwater and rocks, occurs through processes of dissolution and precipitation that attest to the hydrochemical evolution within the aquifer system with direct influence on water quality. In this study, we used the application PHREEQC to simulate these processes in water from seven wells in crystalline collected during dry and wet,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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17. Performance evaluation of commercial copper chromites as burning rate catalyst for solid propellants
Abstract: Copper chromites are well known as burning rate catalysts for the combustion of composite solid propellants, used as a source of energy for rocket propulsion. The propellant burning rate depends upon the catalyst characteristics such as chemical composition and specific surface area. In this work, copper chromite samples from different suppliers we
J. Aerosp. Technol. Manag.. Publicado em: 2010-12
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18. Synthesis of nickel zinc iron nanoparticles by coprecipitation technique
Nanoparticles nickel ferrite of size 6 - 8 nm, synthesized by the coprecipitation method with x varying from 0 to 1.0. The powder samples were characterized by XRD, VSM and FTIR. The average crystallite sizes of the particles were determined from X-ray diffraction. X-ray analysis showed that the samples were cubic spinel. The lattice constant (a o) increased
Materials Research. Publicado em: 2010-09
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19. Argilominerais em solos de manguezais da costa brasileira / Clay minerals in mangrove soils of Brazilian coast
Mangroves are transitional ecosytems between continental and marine environments. Its widely distributed along Brazilian coast under great variability of climatic, oceanographic, geological and geomorphological conditions. Its soil mineralogy has a relevant role in the pedogenic processes and biogeochemical behavior of nutrients and potential inorganic and o
Publicado em: 2010
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20. Análise cristalográfica da solução sólida com estrutura tipo Tungstênio Bronze de niobato de potássio e estrôncio dopado com ferro
Solid solution of iron doped potassium strontium niobate with KSr2(FeNb4)O15-Δ stoichiometry was prepared by high efficiency ball milling method. Structural characterization was carried out by X-ray diffraction. Crystalline structure was analyzed by the Rietveld refinements using the FullProf software. The results showed a tetragonal system with the tetrago
Química Nova. Publicado em: 2010
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21. Synthesis and characterization of hematite pigment, obtained from a waste steel industry / Síntese e caracterização de pigmento de hematita, obtido a partir de um subproduto da indústria siderúrgica
In the ceramic industry of wall and floor tiles, whose selection is strongly influenced by the visual aspect of the decorated surface, the color becomes one of the most important characteristics. With the purpose to search for new pigments that replace or optimize the already known, news method to synthesis are being researched, such as new pigments system a
Publicado em: 2009
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22. Aspectos hidrogeoquímicos de uma microbacia reflorestada com Eucalyptus grandis no município de Angatuba - São Paulo / Hydrogeochemistry aspects of a Eucalyptus grandis reforested watershed in Angatuba - São Paulo
This study aimed to characterize the Entre Rios stream small watershed hydrogeochemistry, reforested with eucalyptus using materials transport models in dissolved and particulate phases, in periods of sampling, before and after the clearcutting. In the experimental area were collected river water samples, suspended particulate material, rain water, soil and
Publicado em: 2009
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23. SEGMENTAÇÃO DE GRÃOS DE HEMATITA EM AMOSTRAS DE MINÉRIO DE FERRO POR ANÁLISE DE IMAGENS DE LUZ POLARIZADA / HEMATITE GRAIN SEGMENTATION OF IRON ORE SAMPLES BY POLARIZED LIGHT IMAGE ANALYSIS
The aim of the present work is to classify co-registered pixels of stacks of polarized light images of iron ore into their respective crystalline grains or pores, thus producing grain segmented images that can be analyzed by their size, shape and orientation distributions, as well as their porosity and the size and morphology of the pores. Polished sections
Publicado em: 2008
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24. Nanofibras de carbono verticalmente alinhadas:: estudo do crescimento por microscopia eletrônica de transmissão
This work is about the growth of vertically aligned Carbon Nanofibers - CNFs - grown by Plasma Enhanced Chemical Vapour Deposition - PECVD. Being so, a detailed study of catalyst particle is necessary and Transmission Electron Microscopy - TEM - is fundamental for this knowledge. Some analytical techniques associated to TEM were used: Bright and Dark Field I
Publicado em: 2008