Results 21 to 30 of about 31,504 (196)
Wormholes supported by hybrid metric-Palatini gravity [PDF]
, 2012 Recently, a modified theory of gravity was presented, which consists of the superposition of the metric Einstein-Hilbert Lagrangian with an $f(\cal R)$ term constructed \`{a} la Palatini.
Capozziello, Salvatore +4 more
core +2 more sources
El régimen del agua y la institucionalización de la función ecosistémica de los páramos colombianos
Entorno Geografico, 2022 En este artículo, se analiza el proceso a través del cual los páramos colombianos han llegado a ser delimitados y declarados objeto de protección especial, prohibiendo los usos mineros y agropecuarios, y demandando la reconversión y sustitución gradual ...
Guillermo Andrés Ospina
doaj +1 more source
Scalar Field Models: From the Pioneer Anomaly to Astrophysical Constraints
, 2005 In this work we study how scalar fields may affect solar observables, and use the constraint on the Sun's central temperature to extract bounds on the parameters of relevant models.
Paramos, J.
core +2 more sources
Frontiers in Environmental ScienceHighly conductive topsoils in neotropical high-elevation grassland-dominated ecosystems, or so-called paramos in the Andean region, influence the local rainfall-runoff processes predominated by saturation-excess overland flow as the primary source of ...
Fernando Jarrin-Perez +4 more
doaj +1 more source
ConservationPhytoremediation is based on the use of plants to decontaminate water and soil. In this work, the capacity of high Andean vegetation in the absorption and translocation of heavy metals was analyzed.
Maritza Lucia Vaca-Cárdenas +9 more
doaj +1 more source
Tamaño de semillas y germinación de Pernettya prostrata (Ericaceae): una especie del páramo andino
Caldasia, 2020 Los páramos andinos son ecosistemas con alto grado de endemismo, pero fuertemente amenazados por cambios ambientales y factores antrópicos. Estudios realizados en los páramos ecuatorianos se han en-focado en conocer patrones de diversidad florística ...
José Miguel Romero-Saritama +1 more
doaj +1 more source
Frontiers in Ecology and Evolution, 2021 Páramos, tropical alpine ecosystems, host one of the world’s most diverse alpine floras, account for the largest water reservoirs in the Andes, and some of the largest soil carbon pools worldwide.
Eloisa Lasso +12 more
doaj +1 more source
Five-dimensional generalized $f(R)$ gravity with curvature-matter coupling [PDF]
, 2014 The generalized $f(R)$ gravity with curvature-matter coupling in five-dimensional (5D) spacetime can be established by assuming a hypersurface-orthogonal spacelike Killing vector field of 5D spacetime, and it can be reduced to the 4D formulism of FRW ...
Lu, Jun-Wang +5 more
core +2 more sources
Grassland Research, EarlyView.Plant species richness was greater in summer in both alpine and subalpine grassland ecosystems. Soil moisture demonstrates significant positive correlations with soil organic carbon and total nitrogen across seasonal periods. Microbial α‐diversity peaks during summer but maintains functional stability across seasons.
Huma Ali +4 more
wiley +1 more source
Angiosperm flora on the páramos of northwestern Colombia: diversity and affinities
PhytoKeys, 2016 Páramos are high-elevation isolated ecosystems in the Andes characterized by specific flora. This flora includes a number of endemic species and some taxa phylogenetically related to temperate lineages (van der Hammen and Cleef 1986).
Fernando Alzate-Guarín +1 more
doaj +3 more sources