46 research outputs found
A 10-Year Evaluation of Implants Placed in Fresh Extraction Sockets: A Prospective Cohort Study
none6[Epub ahead of print]Covani U; Chiappe G; Bosco M; Orlando B; Quaranta A; Barone ACovani, U; Chiappe, G; Bosco, M; Orlando, B; Quaranta, Alessandro; Barone, A
Tungsten silicide films for microwave kinetic inductance detectors
Microwave Kinetic Inductance Detectors (MKIDs) provide highly multiplexed
arrays of detectors that can be configured to operate from the sub-millimeter
to the X-ray regime. We have examined two tungsten silicide alloys (W5Si3 and
WSi2), which are dense alloys that provide a critical temperature tunable with
composition, large kinetic inductance fraction, and high normal-state
resistivity. We have fabricated superconducting resonators and provide
measurement data on critical temperature, surface resistance, quality factor,
noise, and quasiparticles lifetime. Tungsten silicide appears to be promising
for microwave kinetic inductance detectors
Reset dynamics and latching in niobium superconducting nanowire single-photon detectors
We study the reset dynamics of niobium (Nb) superconducting nanowire
single-photon detectors (SNSPDs) using experimental measurements and numerical
simulations. The numerical simulations of the detection dynamics agree well
with experimental measurements, using independently determined parameters in
the simulations. We find that if the photon-induced hotspot cools too slowly,
the device will latch into a dc resistive state. To avoid latching, the time
for the hotspot to cool must be short compared to the inductive time constant
that governs the resetting of the current in the device after hotspot
formation. From simulations of the energy relaxation process, we find that the
hotspot cooling time is determined primarily by the temperature-dependent
electron-phonon inelastic time. Latching prevents reset and precludes
subsequent photon detection. Fast resetting to the superconducting state is
therefore essential, and we demonstrate experimentally how this is achieved