2,677 research outputs found
Immigration and Pension Benefits in the Host-country
This paper examines the role that low-skilled immigrant labor force plays in determining the benefits of the public pension of the host population. With an overlapping-generations model in continuous time which allows to identify which groups of native population are better or worse off with immigration and a fully redistributive pension system, we find that the retirement benefits and hence the welfare levels of the host population are affected in a different way whether sharing or not pension benefits with immigrants. In this sense, the youngest local population may prefer, contrary to the oldest ones, a policy of closed borders.Immigration, welfare, pension benefits.
Defined Contribution vs Defined Pension: Reforming the Legal Retirement Age
In this paper we analyze the effects of changing Social Security parameters on the optimal legal retirement age. Two Social Security Systems are studied, with opposite results. When the pension scheme has a defined contribution, a more redistributive system will delay the preferred legal retirement age. On the other hand, when the pension benefit is the defined parameter, the increase in the redistribution level will lower this preferred age.
When obese people are more patient than non-obese people: a study of post-surgery individuals in a weight loss association
On the properties of the interstellar medium in extremely metal-poor blue compact dwarf galaxies: GMOS-IFU spectroscopy and SDSS photometry of the double-knot galaxy HS 2236+1344
The main goal of this study is to carry out a spatially resolved
investigation of the warm interstellar medium (ISM) in the extremely metal-poor
Blue Compact Dwarf (BCD) galaxy HS 2236+1344. Special emphasis is laid on the
analysis of the spatial distribution of chemical abundances, emission-line
ratios and kinematics of the ISM, and to the recent star-forming activity in
this galaxy. This study is based on optical integral field unit spectroscopy
data from Gemini Multi-Object Spectrograph at the Gemini North telescope and
archival Sloan Digital Sky Survey images. The data were obtained in two
different positions across the galaxy, obtaining a total 4 arcsec X 8 arcsec
field which encompasses most of its ISM. Emission-line maps and broad-band
images obtained in this study indicate that HS 2236+1344 hosts three Giant HII
regions. Our data also reveal some faint curved features in the BCD periphery
that might be due to tidal perturbations or expanding ionized-gas shells. The
ISM velocity field shows systematic gradients along the major axis of the BCD,
with its south-eastern and north-western half differing by ~80 km/s in their
recessional velocity. The Ha and Hb equivalent width distribution in the
central part of HS 2236+1344 is consistent with a very young (~3 Myr) burst.
Our surface photometry analysis indicates that the ongoing starburst provides
~50% of the total optical emission, similar to other BCDs. It also reveals an
underlying lower-surface brightness component with moderately red colors, which
suggest that the galaxy has undergone previous star formation. We derive an
integrated oxygen abundance of 12+log(O/H)=7.53\pm0.06 and a nitrogen-to-oxygen
ratio of log(N/O)=-1.57\pm0.19. Our results are consistent, within the
uncertainties, with a homogeneous distribution of oxygen and nitrogen within
the ISM of the galaxy. (abridged)Comment: 15 pages, 16 figures, accepted for publication in A&
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