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Synthesis, thermal analysis and structural characterization of the ternary compound Ag2SnTe3
(SaberULA, 2019-05-29)
The ternary compound Ag2 SnTe3 has been synthesized and investigated by means of X-ray powder
diffraction and its structure has been refined by the Rietveld method. The thermal differential
analysis indicates a melting ...
Propiedades magnéticas del sistema de aleaciones Cu2Cd1-ZMnZSnSe4
(SaberULA, 2019-05-29)
En este trabajo se reportan las medidas de susceptibilidad magnética X en función de la temperatura en
el rango de 2-300 K de muestras policristalinas del sistema de aleaciones semiconductor magnético
Cu2Cd1-zMnzSnSe4. ...
Urbach’s tail in the absorption spectra of Cu2GeSe3 semiconducting compound
(SaberULA, 2019-05-29)
In the present work we report on the analysis of the Urbach’s tail in pure and Mn-doped Cu2GeSe3
samples having small deviation from its ideal stoichiometry. It is found that the high values of the
phonon energy h?p ...
Efecto del nitrógeno en los parámetros fotosintéticos y de producción del cultivo de la gerbera (Gerberajamesonii H. Bolus ex Hook. f.).
(ActaAgronomica doi: http://dx.doi.org/10.15446/acag.v65n3.49555, 2017-02-20)
Actualmente, existe un interés por comprender los aspectos fisiológicos involucrados en la obtención de altas
producciones en diferentes cultivos y su relación con la disponibilidad de nutrientes en el sustrato. Este ...
Latitudinal and altitudinal patterns of plant community diversity on mountain summits across the tropical Andes.
(Ecography 40: DOI: 10.1111/ecog.02567, 2016-11-04)
The high tropical Andes host one of the richest alpine floras of the world, with exceptionally high levels of endemism
and turnover rates. Yet, little is known about the patterns and processes that structure altitudinal ...
Gas exchange, growth, flowering and furit production in sweet pepper (Capsicum chinenseJacq) along a thermal gradient determined by altitudinal differences in a tropical region
(Experimental Agriculture 15: doi:10.1017/S0014479715000071., 2016-04)
A common practice in some South American countries consists in moving around Capsicum chinense
cultivars between regions where edaphoclimatic conditions differ notably. The purpose of this research
was to compare and relate ...
Functional Diversity in Tropical High Elevation Giant Rosettes
(Goldstein G, Santiago LS (Eds). Tropical Tree Physiology. Springer., 2016-03-04)
Strong daily temperature variations, seasonal soil water availability and high air evaporative demands play an essential role in adaptive responses of tropical high elevation mountain plants. Giant rosettes are a perfect ...
Distribution of juveniles of tree species along a canopy closure gradientin a tropical cloud forest of the Venezuelan Andes
(iForest, 2015-07-31)
Cloud forests represent a minor portion of the world forests, though outstanding in terms of biodiversity, endemisms, and environmental services provided. Understanding the factors that drive the regeneration and species ...
Corredores ecológicos como estrategia para la conservación de los ecosistemas boscosos de la reserva forestal de Caparo, Venezuela
(Interciencia Vol. 40 Nº 4, 2015-04)
La deforestación está generando una transformación del paisaje
que conlleva a la degradación de ecosistemas y fragmentación
de los mismos, con la consecuente pérdida de la biodiversidad.
En Venezuela, los bosques ...