Este articulo revisa el presente y el uso futuro de la extracci6n con fluidos supercriticos (SFE), principalmente dibxido de carbono (CO*) benign0 para el ambiente. La extracci6n con fluidos supercriticos se desarroll6 coma aplicaci6n analitica a mediados de 10s arios 80 coma respuesta al deseo de reducir el uso de disolventes organicos en el ambiente del laboratorio, y se est6 convirtiendo en ...

We investigate the impact of the star formation efficiency in cluster-forming-cores (i.e. local SFE) on the evolution of the mass in star clusters over the age range 1-100Myr, when star clusters undergo their infant weight-loss/mortality phase. Our model builds on the N -body simulation grid of Baumgardt & Kroupa (2007). Assuming a constant formation rate of gas-embedded clusters and a weak tid...

Identifikácia organických látok v slovenskom hnedom uhlí Vzorky slovenského hnedého uhlia z lokality Cígeľ a Handlová boli podrobené nadkritickej fluidnej extrakcii (SFE) oxidom uhličitým, modifikovaným 5 % metanolom. Extrakty, získané metódou SFE, boli podrobené plynovej chromatografii s hmotnostno-spektrometrickou identifikáciou (GC MS). Porovnaním s literárnymi údajmi hmotnostnej spektroskop...

We measure the star formation efficiency (SFE), the star formation rate per unit gas, in 23 nearby galaxies and compare it to expectations from proposed star formation laws and thresholds. We use H I maps from THINGS and derive H2 maps from CO measured by HERACLES and BIMA SONG. We estimate the star formation rate by combining GALEX FUV maps and SINGS 24μm maps, infer stellar surface density pr...

Background: The purpose of this study was to investigate the effect of etching time using 9% hydrofluoric acid on Fracture Load (FL) and surface properties, such as Surface Free Energy (SFE) and Surface Roughness (SR) of three CAD/CAM glass-ceramics. Methods: Following glass-ceramics were investigated: EMP (IPS Empress CAD), KLE (KLEMA CAD/CAM glass-ceramic) and EMC (IPS e.max CAD). For FL, sta...

Iron is an important constituent of kornerupine, (M,Mg,Fe)(Al,Mg,Fe)9(Si,Al,B)5O21(OH,F). We obtained Mössbauer spectra at 300 K on twelve samples with SFe 5 0.30–1.30 atoms per formula unit (apfu) and Fe31/SFe 5 0–0.31; several samples were also run at 77 and 430 K. Models allowing unequivocal refinement of the spectra and determination of site occupancies were developed only when single-cryst...