19,139 research outputs found
Limits of endurance for heat stress arising from work while totally insulated
Endurance limits of humans for heat stress induced by exercise in totally insulated environmen
Inverted initial conditions: exploring the growth of cosmic structure and voids
We introduce and explore "paired" cosmological simulations. A pair consists
of an A and B simulation with initial conditions related by the inversion
(underdensities substituted
for overdensities and vice versa). We argue that the technique is valuable for
improving our understanding of cosmic structure formation. The A and B fields
are by definition equally likely draws from {\Lambda}CDM initial conditions,
and in the linear regime evolve identically up to the overall sign. As
non-linear evolution takes hold, a region that collapses to form a halo in
simulation A will tend to expand to create a void in simulation B. Applications
include (i) contrasting the growth of A-halos and B-voids to test excursion-set
theories of structure formation; (ii) cross-correlating the density field of
the A and B universes as a novel test for perturbation theory; and (iii)
canceling error terms by averaging power spectra between the two boxes.
Generalizations of the method to more elaborate field transformations are
suggested.Comment: 10 pages (including appendix), 6 figures. To be submitted to PR
Thermal detector model for cryogenic composite detectors for the dark matter experiments CRESST and EURECA
The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers)
and the EURECA (European Underground Rare Event Calorimeter Array) experiments
are direct dark matter search experiments where cryogenic detectors are used to
detect spin-independent, coherent WIMP (Weakly Interacting Massive
Particle)-nucleon scattering events by means of the recoil energy. The
cryogenic detectors use a massive single crystal as absorber which is equipped
with a TES (transition edge sensor) for signal read-out. They are operated at
mK-temperatures. In order to enable a mass production of these detectors, as
needed for the EURECA experiment, a so-called composite detector design (CDD)
that allows decoupling of the TES fabrication from the optimization procedure
of the absorber single-crystal was developed and studied. To further
investigate, understand and optimize the performance of composite detectors a
detailed thermal detector model which takes into account the CDD has been
developed.Comment: To appear in Journal of Physics: Conference Series; Proceedings of
Neutrino 2008, Christchurch, New Zealan
Tort Liability for Bad Faith in Montana: The End of the Story
Tort Liability for Bad Faith in Montana: The End of the Stor
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