31,489 research outputs found
Method and data evaluation at NASA endocrine laboratory
The biomedical data of the astronauts on Skylab 3 were analyzed to evaluate the univariate statistical methods for comparing endocrine series experiments in relation to other medical experiments. It was found that an information storage and retrieval system was needed to facilitate statistical analyses
Potts Models on Feynman Diagrams
We investigate numerically and analytically Potts models on ``thin'' random
graphs -- generic Feynman diagrams, using the idea that such models may be
expressed as the N --> 1 limit of a matrix model. The thin random graphs in
this limit are locally tree-like, in distinction to the ``fat'' random graphs
that appear in the planar Feynman diagram limit, more familiar from discretized
models of two dimensional gravity.
The interest of the thin graphs is that they give mean field theory behaviour
for spin models living on them without infinite range interactions or the
boundary problems of genuine tree-like structures such as the Bethe lattice.
q-state Potts models display a first order transition in the mean field for
q>2, so the thin graph Potts models provide a useful test case for exploring
discontinuous transitions in mean field theories in which many quantities can
be calculated explicitly in the saddle point approximation.Comment: 10 pages, latex, + 6 postscript figure
Crossover Between Weakly and Strongly Self-avoiding Random Surfaces
We investigate the crossover between weak and strong self-avoidance in a
simulation of random surfaces with extrinsic curvature. We consider both
dynamically triangulated and rigid surfaces with the two possible
discretizations of the extrinsic curvature term.Comment: 5 page
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Macroeconomic Shocks, Job Security and Health: Evidence from the Mining Industry
How do exogenous changes in the macroeconomic environment affect workers’ perceived job security, and consequently, their mental and physical health? To answer this question, we exploit variation in world commodity prices over the period 2001-17 and analyse panel data that includes detailed classifications of mining workers. We find that commodity price increases cause increases in perceived job security, which in turn, significantly and substantively improve the mental health of workers. In contrast, we find no effects on physical health. Our results imply that the estimated welfare costs of recessions are much larger when the effects of job insecurity, and not only unemployment, are considered
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