160 research outputs found
Evidence of the side jump mechanism in the anomalous Hall effect in paramagnets
Persistent confusion has existed between the intrinsic (Berry curvature) and
the side jump mechanisms of anomalous Hall effect (AHE) in ferromagnets. We
provide unambiguous identification of the side jump mechanism, in addition to
the skew scattering contribution in epitaxial paramagnetic NiCu
thin films, in which the intrinsic contribution is by definition excluded.
Furthermore, the temperature dependence of the AHE further reveals that the
side jump mechanism is dominated by the elastic scattering
Thermoelectric Precession in Turbulent Magnetoconvection
We present laboratory measurements of the interaction between thermoelectric
currents and turbulent magnetoconvection. In a cylindrical volume of liquid
gallium heated from below and cooled from above and subject to a vertical
magnetic field, it is found that the large scale circulation (LSC) can undergo
a slow axial precession. Our experiments demonstrate that this LSC precession
occurs only when electrically conducting boundary conditions are employed, and
that the precession direction reverses when the axial magnetic field direction
is flipped. A thermoelectric magnetoconvection (TEMC) model is developed that
successfully predicts the zeroth-order magnetoprecession dynamics. Our TEMC
magnetoprecession model hinges on thermoelectric current loops at the top and
bottom boundaries, which create Lorentz forces that generate horizontal torques
on the overturning large-scale circulatory flow. The thermoelectric torques in
our model act to drive a precessional motion of the LSC. This model yields
precession frequency predictions that are in good agreement with the
experimental observations. We postulate that thermoelectric effects in
convective flows, long argued to be relevant in liquid metal heat transfer and
mixing processes, may also have applications in planetary interior
magnetohydrodynamics
Automated 3D Segmentation of Kidneys and Tumors in MICCAI KiTS 2023 Challenge
Kidney and Kidney Tumor Segmentation Challenge (KiTS) 2023 offers a platform
for researchers to compare their solutions to segmentation from 3D CT. In this
work, we describe our submission to the challenge using automated segmentation
of Auto3DSeg available in MONAI. Our solution achieves the average dice of
0.835 and surface dice of 0.723, which ranks first and wins the KiTS 2023
challenge.Comment: MICCAI 2023, KITS 2023 challenge 1st plac
Aorta Segmentation from 3D CT in MICCAI SEG.A. 2023 Challenge
Aorta provides the main blood supply of the body. Screening of aorta with
imaging helps for early aortic disease detection and monitoring. In this work,
we describe our solution to the Segmentation of the Aorta (SEG.A.231) from 3D
CT challenge. We use automated segmentation method Auto3DSeg available in
MONAI. Our solution achieves an average Dice score of 0.920 and 95th percentile
of the Hausdorff Distance (HD95) of 6.013, which ranks first and wins the
SEG.A. 2023 challenge.Comment: MICCAI 2023, SEG.A. 2023 challenge 1st plac
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