Results 31 to 40 of about 18,650 (253)

Heat capacities of aqueous sodium hydroxide/aluminate mixtures and prediction of the solubility constant of boehmite up to 300 °C [PDF]

, 2010
A modified commercial (Setaram C80) calorimeter has been used to measure the isobaric volumetric heat capacities of concentrated alkaline sodium aluminate solutions at ionic strengths from 1 to 6 mol kg-1, with up to 40 mol.% substitution of hydroxide by
Hefter, G., Königsberger, E., May, P.M., Schrödle, S.   +3 more
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

{\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

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

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

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

Boehmite and Gibbsite Nanoplates for the Synthesis of Advanced Alumina Products.

ACS Applied Nano Materials, 2018
Boehmite (γ-AlOOH) and gibbsite (α-Al-(OH)3) are important archetype (oxy)hydroxides of aluminum in nature that also play diverse roles across a plethora of industrial applications.
Xin Zhang, P. Huestis, C. Pearce, J. Hu, K. Page, L. Anovitz, A. Aleksandrov, M. Prange, S. Kerisit, M. Bowden, Wenwen Cui, Zhemin Wang, Nicholas R. Jaegers, T. Graham, Mateusz Dembowski, Hsiu‐Wen Wang, Jue Liu, A. N’Diaye, M. Bleuel, D. Mildner, T. Orlando, G. Kimmel, J. A. La Verne, S. Clark, K. Rosso   +24 more
semanticscholar   +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

A micromorphological evaluation of pedogenesis on Isla Santa Cruz (Galápagos) [PDF]

, 2013
Thin sections of about 200 horizons or layers, representing 60 soil profiles in the coastal area and on the windward slopes of Isla Santa Cruz (Galápagos Islands) were analysed.
Stoops, Georges
core   +2 more sources