12,747 research outputs found
Weak magnetism phenomena in heavy-fermion superconductors: selected SR studies
The behavior of the so-called weak moment antiferromagnetic states, observed
in the heavy-fermion superconductors UPt and URuSi, is discussed in
view of recent SR results obtained as function of control parameters like
chemical substitution and external pressure. In UPt, the Pd substitution
for Pt reveals the dynamical character of the weak moment order. On the other
hand, SR measurements performed on samples in which Th substitutes U
suggest that crystallographic disorder on the magnetic sites deeply affects the
fluctuation timescale. In URuSi, a phase separation between the
so-called hidden order state, present at ambient pressure, and an
antiferromagnetic state, occurring under pressure, is observed. In view of the
pressure-temperature phase diagram obtained by SR, it is deduced that the
respective order parameters have different symmetries.Comment: To appear in: J. Phys.: Cond. Matte
Design Considerations for Double-Skin Facades in Hot and Humid Climates
Thermal building simulations (TRNSYS) were linked to nodal airflow network simulations (COMIS) for a ventilated double-skin facade performance calculation and overall energy consumption for office building facades. Simulation results show good agreement with measured data. Especially interesting was the attempt to reduce the high peak cooling loads during the summer period by controlling the exhaust airflow using a climate sensitive regulator. It is shown that up to 26% reduction of annual cooling load can be achieved. This results in significant energy conservation and a reduction in system cooling size
- …