43,596 research outputs found
Entanglement in a multiverse with no common space-time
Inter-universal entanglement may even exist in a multiverse in which there is
no common space-time among the universes. In particular, the entanglement
between the expanding and contracting branches of the universe might have
observable consequences in the dynamical and thermodynamical properties of one
single branch, making therefore testable the whole multiverse proposal, at
least in principle.Comment: 4 pages. Prepared for the proceedings of the Multiverse and
Fundamental Cosmology Meeting (Multicosmofun'12
A standardised method for measuring in situ denitrification in shallow aquifers: numerical validation and measurements in riparian wetlands
A tracer test to examine in situ denitrification in shallow groundwater by a piezometer with a packer system used bromide as a tracer of dilution and acetylene (10%) to block the denitrification process at the nitrous oxide stage. During the test, dissolved oxygen, nitrate (NO3-), bromide (Br-), nitrous oxide (N2O) and dissolved organic carbon (DOC) were measured. To calibrate the experimental method, comparison with numerical simulations of the groundwater transfer were carried out, taking into account the environmental characteristics. The method was tested by measurements undertaken in different environmental conditions (geology, land use and hydrology) in two riparian wetlands. Denitrification rates measured by this method ranged from 5.7 10-6 g N-NO3-L-1 h-1 to 1.97 10-3 g N-NO3-L-1 h-1 The method is applicable in shallow aquifers with a permeability from 10-2 to 10-4m s-1
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