Buscar
Mostrando ítems 21-30 de 2170
Aligning biodiversity conservation and agricultural production in heterogeneous landscapes
(Ecological Society of America, 2020-04-14)
Understanding the trade-offs between biodiversity conservation and agricultural production has become a fundamental question in sustainability science. Substantial research has focused on how species’ populations respond ...
Middle Eocene deformation and sedimentation in the Puna- Eastern Cordillera transition (23°-26°S): Control by preexisting heterogeneities on the pattern of initial Andean shortening
(Geological Society of America, 2007-03)
The Quebrada de los Colorados Formation, at the north end of Calchaquí Valley in Salta Province, northwest Argentina, preserves evidence of syndepositional deformation since the middle Eocene (ca. 40 Ma) that includes (1) ...
Space and time dynamical heterogeneity in glassy relaxation. The role of democratic clusters
(IOP Publishing, 2009-05)
In this work we review recent computational advances in the understanding of the relaxation<br />dynamics of supercooled glass-forming liquids. In such a supercooled regime these systems<br />experience a striking dynamical ...
XPS studies on the Cu(I,II)-polyampholyte heterogeneous catalyst: An insight into its structure and mechanism
(Elsevier Science, 2011-04-01)
A complex between Cu(II) and a polyampholyte synthesized from methacrylic acid, imidazole and ethyleneglycol diglycidyl ether was used as a heterogeneous catalyst for hydrogen peroxide activation and degradation of ...
Nanostructured catalysts applied to degrade atrazine in aqueous phase by heterogeneous photo-Fenton process
(Springer Heidelberg, 2019-02-02)
SBA-15 and KIT-6 materials have been synthesized and modified with iron salts by the wet impregnation method with different metal loadings. The different mesostructures obtained were characterized by N 2 adsorption–desorption ...
Grass-fed beef production systems of Argentina's flooding pampas: Understanding ecosystem heterogeneity to improve livestock production
(SAGE Publications, 2011-06)
The homogeneous topography of Argentina's flooding pampas conceals a substantial amount of spatial and temporal ecosystem heterogeneity. Differences in soils, grassland botanical composition and plant growth regimes that ...
Looking at the dynamical heterogeneity in a supercooled polymer system through isoconfigurational ensemble
(American Institute of Physics, 2018-09)
The dynamic correlations that emerge in a polymer system in supercooling conditions have been studied using molecular dynamic simulations. It is known that when a glass former approaches the glass transition temperature, ...
Spatial oxygen heterogeneity in a Hediste diversicolor irrigated burrow
(Springer, 2012-01)
The heterogeneity of oxygen distribution in a Hediste diversicolor burrow environment was investigated in a laboratory experiment using a 6-mm thick tank equipped with oxygen planar optodes. The two-dimensional oxygen ...
Microwave-assisted multicomponent synthesis of julolidines using silica-supported calix[4]arene as heterogeneous catalyst
(Pergamon-Elsevier Science Ltd, 2019-07-05)
The application of immobilizing calixarene onto the surface of silica using a sol-gel method, as an efficient heterogeneous catalyst (CX4SO3HSi(n)) for multicomponent Povarov reaction has been described. Catalytic activity ...
Determining the heterogeneity in time of the dynamics within a slowly relaxing region of a supercooled liquid: Role of sharp relaxation events
(American Physical Society, 2009-08-26)
Supercooled liquids have been shown to be dynamically heterogeneous with different regions of the system presenting dynamics that vary from each other even by orders of magnitude. Computer simulations have confirmed such ...