Cristina Gabriel

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Throughout the Amazon region, the age of forests regenerating on previously deforested land is determined, in part, by the periods of active land use prior to abandonment and the frequency of reclearance of regrowth, both of which can be quantified by comparing time-series of Landsat sensor data. Using these time-series of near annual data from 1973-2011(More)
ISOPHOT covers the largest wavelength range on ISO from 2.5 to 240 m. Its scientific capabilities include multifilter and multi-aperture photometry, polarimetry, imaging and spectrophotometry. All modes can optionally include a focal plane chopper. The backbone of the photometric calibration are internal standard sources checked against celestial primary(More)
We present maps of NGC 6946 at 61 and 205 m as well as scans through the galaxy at these and at 8 intermediate wavelengths. The bulk of the FIR luminosity arises from a diffuse disk component which extends beyond the 25 mag arcsec 2 B isophote to at least the radius corresponding to the sensitivity limit. A FIR emission counterpart to the outlying HI disk(More)
We observed the reflection nebula NGC7023 at various positions using wide and narrow band photometry centred on the 7.7 and 11.3 m PAH emission features and wide band photometry at 20 and 25 m. No significant variations have been detected over the nebula in the 7.3 and 20 m continuum relative to the total emission in the 6-15 m range (hereafter ). This(More)
The electrochemical charging of Pd rods by deuterium involves a complex coupling of electrochemical, interfacial and transport processes. In order to predict the overpotential. surface coverage and bulk loading of the electrode during charging, a model has been developed that incorporates the essential features of these processes and involves variables such(More)
The Brazilian Amazon in the past decades has been suffering severe landscape alteration, mainly due to anthropogenic activities, such as road building and land clearing for agriculture. Using a high-resolution time series of land cover maps (classified as mature forest, non-forest, secondary forest) spanning from 1984 through 2011, and four uncorrelated(More)
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