Results 21 to 30 of about 13,557 (226)

Physical and chemical weathering rates and CO2 consumption in a tropical lateritic environment: the upper Niger basin [PDF]

, 1998
The chemical composition of Niger river water measured bimonthly at Bamako Mali. during the period 1990–1992 provides an estimate of present weathering rates in the upper Niger basin.
Boeglin, Jean-Loup, Probst, Jean-Luc
core   +2 more sources

Toposseqüências de Latossolos originados de rochas basálticas no Paraná: I - mineralogia da fração argila Oxisol toposequences developed from basaltic rocks in Paraná State, Brazil: I - clay fraction mineralogy

Revista Brasileira de Ciência do Solo, 2006
Com o objetivo de estudar o efeito de diferentes posições do relevo e materiais de origem sobre as características mineralógicas da fração argila dos solos, foram estudadas duas toposseqüências de Latossolos (Latossolo Bruno ácrico LBw e Latossolo ...
André Ademir Ghidin, Vander de Freitas Melo, Valmiqui Costa Lima, Jane Maria Jonasson Costa Lima   +3 more
doaj   +1 more source

Do Aggregate Size Classes of the Subsurface Soil Horizon Have Different Chemical/Mineralogical Properties?

Revista Brasileira de Ciência do Solo, 2019
Variations in chemical and mineralogical properties of a soil can occur at short vertical and horizontal distances. The objective of the present study was to evaluate the chemical and mineralogical soil properties of different aggregate classes from ...
Rolff Vladimir Mitton, Vander Freitas Melo, Volnei Pauletti   +2 more
doaj   +1 more source

Hillslope curvature, clay mineralogy, and phosphorus adsorption in an Alfisol cultivated with sugarcane Curvaturas de relevo, mineralogia da argila e adsorção de fósforo em Argissolo cultivado com cana-de-açúcar

Scientia Agricola, 2009
Hillslope curvatures are associated with specific environments that correlate to chemical and mineralogical attributes of soil, so determining specific management zones.
Diogo Mazza Barbieri, José Marques Júnior, Luis Reynaldo Ferracciú Alleoni, Fernando José Garbuio, Livia Arantes Camargo   +4 more
doaj   +1 more source

Decomposition of Bayer process organics: Phenolates, polyalcohols, and additional carboxylates [PDF]

, 2011
The degradation of nineteen low-molecular-weight phenolates, polyalcohols and selected aliphatic and aromatic carboxylates of relevance to the Bayer process has been studied in 6 mol kg-1 NaOH(aq) at 90 °C for up to 36 days, and (for some species) at 180
Hefter, G.T., Laird, D.W., Machold, T., May, P.M., Rowen, C.C.   +4 more
core   +2 more sources

First discovery of gibbsite in Biryuzakan turquoise deposit, Northern Tajikistan

Известия высших учебных заведений: Геология и разведка
Background. In the quartz veins of the Biryuzakan turquoise deposit, a hydrothermal mineralization of varicolored gibbsite was discovered for the first time. The gibbsite varies from light- to dark blue in color, resembling turquoise. Aim.
Sh. T. Vosihov, A. K. Litvinenko, M. A. Rassomakhin   +2 more
doaj   +1 more source

Investigation the Effects of Boehmite and Gibbsite on the Electrochemical Behaviours of Gel-VRLA Batteries

International Journal of Electrochemical Science, 2018
In this work, gibbsite and boehmite were used as additives of gel valve regulated lead acid battery for the first time in the literature. Optimum amounts of additives were determined as 0.6wt% for each species by using of cyclic voltammetric and ...
Metin GENÇTEN
doaj   +1 more source

The bauxite-bearing lateritic profile of the Jequié Complex, São Francisco Craton, Brazil: potential for rare earth elements mineralization and insights on the mineral system

Journal of the Geological Survey of Brazil, 2023
The Jequié Block is located at the northeastern portion of the São Francisco Craton and represents the Archean tectonic paleoplate that hosts the Jequié Complex.
Daniel Augusto de Miranda, Caroline Couto Santos, Fabrício Pereira dos Santos, Anderson Roque Araújo dos Santos Meneses, Carlos Magno Santos Clemente, Rita Oliveira, Isabel Leonor Iza Echeverria Herrera   +6 more
doaj   +1 more source

{\it Ab initio} $^{27}Al$ NMR chemical shifts and quadrupolar parameters for $Al_2O_3$ phases and their precursors

, 2011
The Gauge-Including Projector Augmented Wave (GIPAW) method, within the Density Functional Theory (DFT) Generalized Gradient Approximation (GGA) framework, is applied to compute solid state NMR parameters for $^{27}Al$ in the $\alpha$, $\theta$, and ...
A. Ramos-Gallardo, Alexandre A. Leitão, Ary R. Ferreira, Emine Küçükbenli, G. Ertl, H. Böttger, M. Born, R. Bader, Stefano de Gironcoli   +8 more
core   +1 more source

On phase behavior and dynamical signatures of charged colloidal platelets

, 2013
We investigate the competition between anisotropic excluded-volume and repulsive electrostatic interactions in suspensions of thin charged colloidal discs, by means of Monte-Carlo simulations and dynamical characterization of the structures found.
Davidson, P., Jabbari-Farouji, S., Levitz, P., Trizac, E., Weis, J. -J.   +4 more
core   +2 more sources