674 research outputs found
Methane flux from created marshes: Effects of intermittent vs. continuous inundation and emergent macrophytes
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Nitrous oxide fluxes and denitrification in created wetlands receiving hydrological pulses
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F-monoids
A semigroup is called if has an identity and if there exists a group congruence on such that each -class of contains a greatest element with respect to the natural partial order of (see Mitsch, 1986). Generalizing results given in Giraldes et al. (2004) and specializing some of Giraldes et al. (Submitted) five characterizations of such monoids are provided. Three unary operations , and on defined by means of the greatest elements in the different -classes of are studied. Using their properties, a charaterization of -monoids by their regular part and the associates of elements in is given. Under the hypothesis
that is a subsemigroup it is shown that is regular, whence of a
known structure (see Giraldes et al., 2004).Fundação para a Ciência e a Tecnologia (FCT
F −semigroups
A semigroup S is called F−semigroup if there exists a group congruence ρ on S such that every ρ −class contains a greatest element with respect to the natural partial order ≤ of S . This generalizes the concept of F−inverse semigroups introduced by V. Wagner
in 1961 and investigated by McFadden and O’Caroll in 1971. Five different characterisations of general F−semigroups S are given: by means of residuals, by special principal anticones, by properties of the set of idempotents, by the maximal elements in (S, ≤) and finally, an axiomatic one using an additional unary operation. Also, F−semigroups in special classes are considered; in particular, inflations of semigroups and strong semi-
lattices of monoids are studied.Centro de Matemática da Universidade do MinhoFundação para a Ciência e a Tecnologia (FCT
Biogeochemical patterns of created riparian wetlands: Twelfth-year results (2005)
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Dispersive Optical Interface Based on Nanofiber-Trapped Atoms
We dispersively interface an ensemble of one thousand atoms trapped in the
evanescent field surrounding a tapered optical nanofiber. This method relies on
the azimuthally-asymmetric coupling of the ensemble with the evanescent field
of an off-resonant probe beam, transmitted through the nanofiber. The resulting
birefringence and dispersion are significant; we observe a phase shift per atom
of \,1\,mrad at a detuning of six times the natural linewidth,
corresponding to an effective resonant optical density per atom of 0.027.
Moreover, we utilize this strong dispersion to non-destructively determine the
number of atoms.Comment: 4 pages, 4 figure
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