29 research outputs found
Distinctive Doping Dependence of Upper Critical Field in Iron-Based Superconductor LaFeAsOH
High magnetic fields up to 105 T have been utilized in deriving the upper
critical field of LaFeAsOH throughout whole
temperatures below . Resistivity measurements demonstrate that
behaves differently in samples with (SC1) from those
with 0.32 (SC2). In SC1, the two-band model assuming the -wave pairing gives
a good fitting with repulsive intraband interaction and dominant interband
coupling. In SC2, we have to assume attractive intraband interaction with weak
interband coupling, which in fact suggests a non--wave pairing in view of
the strong Coulomb repulsion. These results support the possibility that SC1
and SC2 have different pairing symmetries
Reducing Floor Impact Vibration and Sound Using a Momentum Exchange Impact Damper
This paper deals with reducing floor impact vibration and sound by using a momentum exchange impact damper. The impact damper consists of a spring and a mass that is contact with the floor. When a falling object collides with the floor, the floor interacts with the damper mass, and the momentum of the falling object is transferred to the damper. In this works a computational model is formulated to simulate dynamic floor vibration induced by impact. The floor vibration is simulated for various sized damper masses. A proof-of-concept experimental apparatus was fabricated to represent a floor with an impact damper. This example system consists of an acrylic plate, a ball for falling object, and an impact damper. A comparison between simulated and experimental results were in good agreement in suggesting that the proposed impact damper is effective at reducing floor impact vibration and sound by 25% and 63%, respectively