4 research outputs found
Melting Domain Size and Recrystallization Dynamics of Ice Revealed by Time-Resolved X-ray Scattering
The phase transition between water and ice is ubiquitous and one of the most
important phenomena in nature. Here, we performed time-resolved x-ray
scattering experiments capturing the melting and recrystallization dynamics of
ice. The ultrafast heating of ice I is induced by an IR laser pulse and probed
with an intense x-ray pulse, which provided us with direct structural
information on different length scales. From the wide-angle x-ray scattering
(WAXS) patterns, the molten fraction, as well as the corresponding temperature
at each delay, were determined. The small-angle x-ray scattering (SAXS)
patterns, together with the information extracted from the WAXS analysis,
provided the time-dependent change of the size and the number of the liquid
domains. The results show partial melting (~13 %) and superheating of ice
occurring at around 20 ns. After 100 ns, the average size of the liquid domains
grows from about 2.5 nm to 4.5 nm by the coalescence of approximately six
adjacent domains. Subsequently, we capture the recrystallization of the liquid
domains, which occurs on microsecond timescales due to the cooling by heat
dissipation and results to a decrease of the average liquid domain size
Prognosis after Implantation of Cardioverter-Defibrillators in Korean Patients with Brugada Syndrome
First test-beam results obtained with IDEA, a detector concept designed for future lepton colliders
IDEA (Innovative Detector for Electron\u2013positron Accelerators) is a detector concept designed for a future leptonic collider operating as a Higgs factory. It is based on innovative detector technologies developed over years of R&D. In September 2018, prototypes of the proposed sub-detectors have been tested for the first time on a beam line at CERN. The preliminary results from this test of a full slice of the IDEA detector and standalone measurements of dual read-out calorimeter prototypes are presented