J. Hernández-Rosas

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InAs layers with thickness of 1 monolayer (d-layers) were grown by MBE embedded in GaAs barriers in the direction [1 0 0]. Photoluminescence (PL) spectroscopy was employed to study the electronic transitions in the d-layers. By secondary-ion mass spectroscopy (SIMS) we checked out the possible In segregation. The samples consist of five InAs d-layers(More)
By international agreement (Austria-Venezuela) a tower crane was installed near Surumoni river, Upper Orinoco, for canopy research in a tropical rain forest. From the 1.5 ha crane-accessible area of the forest, an experimental plot was selected for assessment of the canopy plants' aerial substrates and to determine their relationship with spatial(More)
By international agreement (Austria-Venezuela), an experimental area was selected for canopy ecology studies. A tower crane was installed that allows direct access to the canopy of 1.5 ha area of the forest. This is a quantitative study of the phorophyte occupation patterns by vascular epiphyte species in an Amazon tropical humid forest. The forest of(More)
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