al Aspects in Calibration o

Technical aspects on DAP calibration and CT calibration

Calibration Weighting to Compensate for Extreme Values, Non-response and Non-coverage in Labor Force Survey

Frame imperfection, non-response and unequal selection probabilities always affect survey results. In order to compensate for the effects of these problems, Devill and Särndal (1992) introduced a family of estimators called calibration estimators. In these estimators we look for weights that have minimum distance with design weights based on a distance function and satisfy calibration equa...

Performance tradeoffs in target-group bias correction for species distribution models

question to the fi tting of statistical distribution models to P-O datasets (i.e. model calibration; Chefaoui and Lobo 2008, Vanderwal et al. 2009, Barbet-Massin et al. 2012). A fundamental assumption in SDM calibration is the unbiased sampling of available conditions in the environmental space (Araú jo and Guisan 2006, Pearce and Boyce 2006). However, sampling bias is a widespread issue since ...

[O iii]/[N ii] as an abundance indicator at high redshift

Among ‘empirical’ methods of estimating oxygen abundances in extragalactic H ii regions, the use of the ratio of nebular lines of [O iii] and [N ii], first introduced by Alloin et al. in 1979, is reappraised with modern calibration data and shown to have certain advantages over R23 ≡ ([O ii] + [O iii])/Hβ and N2 ≡ [N ii] λ6583/Hα, particularly when applied to star-forming galaxies at high redsh...

Development of Synergic Mixed Metal Oxides for the Combined Catalytic-Absorptive Removal of Nitric Oxide from Diesel Exhaust

The NO removal over oxide sorbents (K2O/Al2O3 , CaO/Al2O3 and BaO/Al2O3) at a loading of up to 25 wt.% was investigated using a synthetic diesel exhaust gas containing  1,000 ppm NO, 1000 ppm iso-butane (i-C4H10), 8% O2 and N2 balance. The reactor was operated  at 250 <su...