6,870 research outputs found
Does Foreign Aid Help Reduce Income Inequality?
The aim of this paper is to provide empirical evidence on the link between foreign aid and income inequality for the period 1973-2002. Since simple cross-country regressions cannot be taken as `true` time series findings, we also focus on dynamic panel data techniques, which allow accounting for potential simultaneity and heterogeneity problems. We do not find very robust evidence that foreign aid is conducive to the improvement of the distribution of income, even when the quality of institutions is taken into account. This finding is consistent with recent empirical research on aid and growth that shows that such a link is weak at best.
A Large-field J=1-0 Survey of CO and Its Isotopologues Toward the Cassiopeia A Supernova Remnant
We have conducted a large-field simultaneous survey of CO, CO,
and CO emission toward the Cassiopeia A (Cas A) supernova
remnant (SNR), which covers a sky area of . The
Cas giant molecular cloud (GMC) mainly consists of three individual clouds with
masses on the order of . The total mass derived from the
emission of the GMC is 2.1 and is
9.5 from the emission. Two regions with
broadened (67 km s) or asymmetric CO line profiles are found
in the vicinity (within a 10 region) of the Cas A SNR, indicating
possible interactions between the SNR and the GMC. Using the GAUSSCLUMPS
algorithm, 547 CO clumps are identified in the GMC, 54 of which are
supercritical (i.e. ). The mass spectrum of the molecular
clumps follows a power-law distribution with an exponent of . The
pixel-by-pixel column density of the GMC can be fitted with a log-normal
probability distribution function (N-PDF). The median column density of
molecular hydrogen in the GMC is cm and half the mass
of the GMC is contained in regions with H column density lower than
cm, which is well below the threshold of star
formation. The distribution of the YSO candidates in the region shows no
agglomeration.Comment: 24 pages, 18 figure
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