Calcite
Mostrando 25-36 de 99 artigos, teses e dissertações.
-
25. Efecto sobre la dilución de la granulometría de la ferroaleación en el alma de electrodos tubulares revestidos bajo la influencia de la composición del revestimiento
The possibility of working at lower current and, consequently, reaching low dilution, points out advantages in the use of metal cored coated electrodes over conventional ones for hardafacing. It is known that the grain size of the filling alloy elements plays important role in the exothermic oxidation process, reflecting on the operational characteristics of
Soldagem & Inspeção. Publicado em: 2011-03
-
26. Análise de pinturas rupestres do Abrigo do Janelão (Minas Gerais) por microscopia raman
Rock art paintings from Abrigo do Janelão (Minas Gerais, Brazil) were non-destructively investigated by Raman Microscopy, aiming at the identification of materials used, their interaction and degradation. This technique is particularly tailored for heterogeneous samples and allows unequivocal identification of the substances present in the investigated samp
Química Nova. Publicado em: 2011
-
27. Modeling the potential distribution of the invasive golden mussel Limnoperna fortunei in the Upper Paraguay River system using limnological variables.
The invasive golden mussel, Limnoperna fortunei (Dunker, 1857), was introduced into the La Plata River estuary and quickly expanded upstream to the North, into the Paraguay and Paraná rivers. An ecological niche modeling approach, based on limnological variables, was used to predict the expansion of the golden mussel in the Paraguay River and its tributarie
Brazilian Journal of Biology. Publicado em: 2011
-
28. Forecasting the expansion of the invasive golden mussel Limnoperna fortunei in Brazilian and North American rivers based on its occurrence in the Paraguay River and Pantanal wetland of Brazil.
The bivalve Limnoperna fortunei (Dunker, 1857), also called golden mussel, is native to Asia but becoming dispersed around the world. The golden mussel resembles the invasive dreissenid bivalves in many respects, and although much less studied it evidently has broader environmental tolerances. The golden mussel was introduced into the La Plata River estuary
Aquatic Invasions. Publicado em: 2011
-
29. Avaliação de uma rocha ígnea como corretivo de acidez e disponibilização de nutrientes para as plantas.
RESUMO: O objetivo deste trabalho foi avaliar o potencial da rocha fresca carbonatito, proveniente da mina de fosfato localizada em Catalão - GO, como um possível fonte de insumos para a agricultura. O ensaio foi conduzido no campo, com o objetivo de avaliar o potencial de carbonatito como fonte de: (a) P; e, (b) K, para uma pastagem de Brachiaria ruzizien
Planaltina. Publicado em: 2011
-
30. Recuperação de urânio de rejeito de mina por meio de lixiviação alcalina / Recovery of uranium from mine wastes by alkaline leaching
Appropriate management of wastes is one of the most important environmental problems, particularly concerning the tailings of mining activities. Interim storage of the tailings at incorrect places pending treatment demands an urgent solution. The Osamu Utsumi Mine located in the city of Caldas, Minas Gerais, has faced such problem. The waste of the mine cons
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2010
-
31. 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
-
32. Síntesis de una matriz cuasiceramica destinada a la obtención de fundentes aglomerados para proceso SAW y evaluación cinético-termodinámica de su proceso de humectación
In the this paper is presented a conception of the synthesis by sinterización at relative low temperature, of an amorphous cuasiceramic matrix to be used in agglomerated flux in the SAW process. In the design of the cuasiceramic it was made a valuation of the chemical composition of the diferent mineral concentrates (feldspar, zeolite and calcite), as well
Soldagem & Inspeção. Publicado em: 2010-06
-
33. Nuclear anomalies in the buccal cells of calcite factory workers
The micronucleus (MN) assay on exfoliated buccal cells is a useful and minimally invasive method for monitoring genetic damage in humans. To determine the genotoxic effects of calcite dust that forms during processing, MN assay was carried out in exfoliated buccal cells of 50 (25 smokers and 25 non-smokers) calcite factory workers and 50 (25 smokers and 25 n
Genetics and Molecular Biology. Publicado em: 26/03/2010
-
34. Interpretação do mecanismo de difusão no processo gás-sólido da reação de dessulfurização
The present paper aims to interpret the SO2 diffusion mechanism process for two different limestones: a calcite and a dolomite. In previous study, the apparent activation energies for sulfation reaction were between 3.03 and 4.45 kJ mol-1 for the calcite, and 11.24 kJ mol-1 for the dolomite. Using nitrogen porosimetry it was possible to observe that the dolo
Química Nova. Publicado em: 2010
-
35. Metalogênese do depósito de cobre Cerro dos Martins, RS: revisão e geoquímica isotópica de SR, O e C-
This paper presents the geology, chemical data, Pb-Pb zircon ages, sulfur, carbon, oxygen, strontium isotopes and fluid inclusions of Cerro dos Martins copper deposit. The deposit is hosted by the Neoproterozoic volcano-sedimentary sequence of the Camaquã Basin in the Rio Grande do Sul Shield, southern Brazil. The ores consist of a set of Cu-sulfide NW-tren
Publicado em: 2010
-
36. Influência do teor e granulometria da calcita e da temperatura de sinterização no desenvolvimento de massas cerâmicas para revestimento poroso(BIII) / Influence of particle size and content of calcite and sintering temperature on the development of porous ceramic body coating
Este trabalho objetiva estudar a influência da concentração de calcita, sua granulometria e temperatura de sinterização na obtenção de formulações para revestimento poroso que atendam as especificações da norma. Os experimentos envolveram a caracterização físicoquímica e mineralógica das matérias-primas, e ensaios mecânicos nos corpos de pr
Publicado em: 2010