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Geologia do complexo metacarbonatítico de angico dos dias, divisa bahia/piauí, Brasil
(2017-01-01)
Paleoproterozoic rocks from Angico dos Dias Metacarbonatite Complex (MCCAD) are intrusive in Archean-Paleoproterozoic migmatitic gneissic rocks of Sobradinho-Remanso Complex, located at the interface between the Craton of ...
Geoquímica e proveniência dos sedimentos da formação corumbataí na região de Rio Claro/SP
(2017-01-01)
Corumbataí Formation in Rio Claro – Limeira – Araras (São Paulo State, Brazil) is represented by a succession of siltstones mainly consisting of phyllosilicates (predominating illite, although montmorillonite, biotite, ...
Natural radionuclides in plants, soils and sediments affected by U-rich coal mining activities in Brazil
(2017-10-01)
Mining activities can increase the mobility of metals by accelerating the dissolution and leaching of minerals from the rocks and tailing piles to the environment and, consequently, their availability for plants and ...
Geoelectric modeling of supergenic manganese ocurrence in heliodora region, Southern Minas Gerais
(2016-01-01)
This paper discusses the results of the combined application of Electric resistivity and Induced Polarization methods into a mineral occurrence of manganese of super-genic origin, characterized by oxides of manganese and ...
Numerical simulations to assess ART and MART performance for ionospheric tomography of chapman profiles
(2017-07-01)
The incomplete geometrical coverage of the Global Navigation Satellite System (GNSS) makes the ionospheric tomographic system an ill-conditioned problem for ionospheric imaging. In order to detect the principal limitations ...
Petrografia das rochas do complexo metacarbonatítico de Angico dos Dias, Divisa Bahia/piauí, Brasil.
(2017-01-01)
The Angico dos Dias Metacarbonatite Complex rocks are mined for mineral phosphate by GALVANI Mining Unit, in the extreme northwest region of Bahia State. These are intrusive Paleoproterozoic rocks occurring in Archean-Pa ...
First results from an airborne GPS radio occultation system for atmospheric profiling
(Amer Geophysical Union, 2014-03-16)
Global Positioning System (GPS) radio occultation (RO) from low Earth-orbiting satellites has increased the quantity of high-vertical resolution atmospheric profiles, especially over oceans, and has significantly improved ...
Crowded Rosselia ichnofabric in the Early Devonian of Brazil: An example of strategic behavior
(Elsevier B.V., 2014-02-01)
The occurrence of crowded Rosselia ichnofabric in Early Devonian deposits of 'Transition Beds' (Western Gondwana Parana Basin, southern Brazil) and the paleobiology and paleoecology of its potential tracemakers are discussed ...
Absorção e níveis críticos de fósforo na parte aérea da mamoneira cultivada em diferentes classes de solos
(Univ Estadual Londrina, 2014-01-01)
Soil that has a high degree of weathering, with more inorganic P bound to Fe and Al oxides, has less P availability to plants. Thus, the critical element of a plant refers to the level below which the growth rate and plant ...
Comparison of polymers and ceramics in new and discarded electrical insulators: reuse and recycling possibilities
(Univ Fed Rio De Janeiro, Lab Hidrogenio, 2013-10-01)
The expansion and maintenance of electricity distribution networks generates large amounts of waste, much of it in the form of discarded insulators that are not reused or recycled. This paper describes the results of tests ...