Silicon Extraction
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Hydrometallurgical extraction of Al and Si from kaolinitic clays
Abstract Herein is presented the results of a study on the hydrometallurgic extraction and recovery of aluminum and silicon by leaching of kaolinitic clays with HF. The studied extraction parameters were: temperature, reaction time, solid/liquid ratio, concentration, and precipitating agent mass. In the leaching process, mineral dissolutions near 100% were o
REM, Int. Eng. J.. Publicado em: 2017-12
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2. Rice Husk Ash as Raw Material for the Synthesis of Silicon and Potassium Slow-Release Fertilizer
Rice husk ash (RHA) is a waste material produced in large quantities in many regions worldwide, and its disposal can be problematic. This work describes a method for using RHA to synthesize silicon and potassium slow-release fertilizer. The extraction of silica from RHA was accomplished by alkaline leaching with KOH. Different KOH concentrations and reaction
J. Braz. Chem. Soc.. Publicado em: 2017-11
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3. Micronutrient and Silicon Uptake and Removal by Upland Rice Cultivars with Different Plant Architecture
ABSTRACT Upland rice cultivars manifest different nutritional demands. A field study was conducted to quantify the extraction, distribution, and removal of micronutrients and silicon by the upland rice cultivars. The experiment was arranged in a randomized complete block-split plot design. Plots consisted of three cultivars (Caiapó – traditional, BRS Prim
Rev. Bras. Ciênc. Solo. Publicado em: 23/06/2016
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4. Feasibility of RF Sputtering and PIIID for production of thin films from red mud
During the extraction of aluminum from bauxite, a waste of oxides containing traces of heavy metals in a highly alkaline matrix, called Red Mud (RM), is produced. In this study RM is characterized and the feasibility of using it as a precursor for the production of thin films by Plasma Sputtering and by Plasma Immersion Ion Implantation and Deposition (PIIID
Mat. Res.. Publicado em: 26/10/2014
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5. Efeito da Taxa de Resfriamento e dos Tratamentos Térmicos sobre as Propriedades Mecânicas da Liga Al-Si-Mg (A356.0) Fundida / Efeito da Taxa de Resfriamento e dos Tratamentos Térmicos sobre as Propriedades Mecânicas da Liga Al-Si-Mg (A356.0) Fundida
The A356.0 alloy is widely used in aerospace and automotive industry and other structural applications which require high mechanical strength. The control of solidification cooling rate and heat treatments are necessary to obtain more appropriate microstructures resulting in improvement of their properties. In this paper was evaluated the influence of coolin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2011
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6. Monitoração dinâmica de asserções para depuração em silício
The increasing demand for shorter time-to-market, combined with increased complexity and performance requirements put a tremendous pressure on post-silicon debug, which is usually the last step prior to chip release. In contrast to pre-silicon techniques, postsilicon debug have two main limitations, controllability and observability, which cause the failure
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/08/2011
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7. Espectroscopia de infravermelho próximo em análises de solos e plantas / Near-Infrared Spectroscopy in Analysis of soils and plants
Analyses of soils and plants, essential for crop fertilization management, are based on methodologies that are time and reagent consuming. Near infrared spectroscopy (NIR - Near-infrared) has proven as a faster and cleaner alternative for simultaneous quantification of compounds. This study evaluates the methodologies based on NIR combined with multivariate
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/06/2011
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8. Obtenção e caracterização do extrato seco Padronizado de Vernonanthura ferruginea (LESS.) H. Rob., Asteraceae (Assa-Peixe) / Obtaining and chacterization of santadardized dry extract of Vernonanthura ferruginea (LESS.) H. Rob., Asteraceae
Vernonanthura ferruginea (Less.) H. Rob. (Asteraceae), a typical plant of the Brazilian savannah, popularly known as assa-peixe, presented analgesic, antiedematogenic, antioxidant and antiulcer activities in scientific studies. But in literature there are no works related to the production of dried extracts of this plant species. In this work, standardized s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/04/2011
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9. Obtenção e caracterização do extrato seco Padronizado de Vernonanthura ferruginea (LESS.) H. Rob., Asteraceae (Assa-Peixe) / Obtaining and chacterization of santadardized dry extract of Vernonanthura ferruginea (LESS.) H. Rob., Asteraceae
Vernonanthura ferruginea (Less.) H. Rob. (Asteraceae), a typical plant of the Brazilian savannah, popularly known as assa-peixe, presented analgesic, antiedematogenic, antioxidant and antiulcer activities in scientific studies. But in literature there are no works related to the production of dried extracts of this plant species. In this work, standardized s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/04/2011
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10. Extratores de Silício disponível em escórias e fertilizantes / Extractors available in silicon slag and fertilizer
O Si (Silício) é considerado como sendo um elemento benéfico para as plantas e classificado como um micronutriente. Vários são os benefícios do Si para a agricultura, principalmente para as gramíneas, até o presente momento não existem metodologias confiáveis e eficientes para quantificar o Si disponível. Foram estudadas, então, metodologias capa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/04/2011
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11. Desenvolvimento de uma metodologia de fabricação de transistores de filmes finos orgânicos. / Development of a manufacturing methodology for organic thin film transistors.
In this work, it is presented a methodology for organic thin-film transistor (OTFT) fabrication. Poly(3-hexylthyophene) (P3HT):[6,6]-phenyl-C61-butyric acidmethyl ester (PCBM) bulk heterojunction solar cells were studied for their maximum power conversion efficiency (PCE) around 5 %. Efficiencies evolution in time from 10-6 to 1.7 % show the difficulties inv
Publicado em: 2010
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12. Theoretical-experimental study of the drain current transient and generation lifetime in SOI MOSFETs technologies. / Estudo teórico-experimental do transitório da corrente de dreno e do tempo de vida de geração em tecnologias SOI MOSFETs.
This work presents a study of drain current switch-off transients and extraction methods of the generation lifetime in partially depleted SOI nMOSFET transistors of single gate, double gate and triple gate FinFETs. This study is accomplished through two-dimensional numerical simulations and compared with experimental data of devices fabricated in the IMEC (I
Publicado em: 2008