Paul Wurth

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The instability of the fully polarized ferromagnetic state (Nagaoka state) with respect to single spin ips is reexamined for the Hubbard model on the square lattice with a large family of variational wave functions which include correlation eeects of the majority spins in the vicinity of the ipped spin. We nd a critical hole density of cr = 0:251 for U = 1(More)
This paper fits within the context of the implementation of the EU Water Framework Directive (WFD) and its emission-immission based approach for river basin management. More particularly, it focuses on the sewer-wastewater treatment-river system. Using an integrated model of various system configurations of a real case study, a scenario analysis is(More)
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