2,627 research outputs found
Recommended from our members
Psychological Costs of Migration: Home Country Natural Disasters and Mental Health
The psychological toll of leaving one's familiar environment is a dominant explanation for why some people do not migrate despite relatively high wage differentials and low monetary costs of moving. Yet there is little direct empirical evidence on the existence and the characteristics of psychic costs. Using linked administrative and survey data (the 45 and Up Study) from Australia, a country where one in four residents was born overseas, we show that migrant mental health is significantly affected by home country natural disasters. In the three months following a disaster, mental health related drug use and visits to mental health specialists increase by 5% and 33%, respectively. The effects persist for up to 12 months after the initial shock and increase with distance to the home country. In contrast, we do not find any effects of home country disasters on the physical health conditions of migrants. Given that individuals in our sample have lived in their destination country for an average of 40 years, our estimates suggest strong persistence in these costs
HI Fluctuations at Large Redshifts: II - the Signal Expected for GMRT
For the GMRT, we calculate the expected signal from redshifted HI emission at
two frequency bands centered at 610 and 325 MHz. The study focuses on the
visibility-visibility cross-correlations, proposed earlier as the optimal
statistical estimator for detecting and analyzing this signal. These
correlations directly probe the power spectrum of density fluctuations at the
redshift where the radiation originated, and thereby provide a method for
studying the large scale structures at large redshifts. We present detailed
estimates of the correlations expected between the visibilities measured at
different baselines and frequencies. Analytic fitting formulas representing the
salient features of the expected signal are also provided. These will be useful
in planning observations and deciding an optimal strategy for detecting this
signal.Comment: 16 pages including 7 figures, published in JAp
Free-energy functional for freezing transitions: Hard sphere systems freezing into crystalline and amorphous structures
A free-energy functional that contains both the symmetry conserved and
symmetry broken parts of the direct pair correlation function has been used to
investigate the freezing of a system of hard spheres into crystalline and
amorphous structures. The freezing parameters for fluid-crystal transition have
been found to be in very good agreement with the results found from
simulations. We considered amorphous structures found from the molecular
dynamics simulations at packing fractions lower than the glass close
packing fraction and investigated their stability compared to that
of a homogeneous fluid. The existence of free-energy minimum corresponding to a
density distribution of overlapping Gaussians centered around an amorphous
lattice depicts the deeply supercooled state with a heterogeneous density
profile
Recommended from our members
Mental health stigma
Comparing self-reports to administrative records, we find that survey respondents are significantly more likely to under-report mental illnesses compared to other health conditions. This behavior is consistent with the existence of stigma of mental illnesses. We show that stigma can play a role in determining health-seeking behavior
Polarized micro-Raman studies of femtosecond laser written stress-induced optical waveguides in diamond
Understanding the physical mechanisms of the refractive index modulation
induced by femtosecond laser writing is crucial for tailoring the properties of
the resulting optical waveguides. In this work we apply polarized Raman
spectroscopy to study the origin of stress-induced waveguides in diamond,
produced by femtosecond laser writing. The change in the refractive index
induced by the femtosecond laser in the crystal is derived from the measured
stress in the waveguides. The results help to explain the waveguide
polarization sensitive guiding mechanism, as well as providing a technique for
their optimization.Comment: 5 pages, 4 figure
- …