48 research outputs found
UnLoc: A Unified Framework for Video Localization Tasks
While large-scale image-text pretrained models such as CLIP have been used
for multiple video-level tasks on trimmed videos, their use for temporal
localization in untrimmed videos is still a relatively unexplored task. We
design a new approach for this called UnLoc, which uses pretrained image and
text towers, and feeds tokens to a video-text fusion model. The output of the
fusion module are then used to construct a feature pyramid in which each level
connects to a head to predict a per-frame relevancy score and start/end time
displacements. Unlike previous works, our architecture enables Moment
Retrieval, Temporal Localization, and Action Segmentation with a single stage
model, without the need for action proposals, motion based pretrained features
or representation masking. Unlike specialized models, we achieve state of the
art results on all three different localization tasks with a unified approach.
Code will be available at: \url{https://github.com/google-research/scenic}.Comment: ICCV 202
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A Giant Bulk-Type Dresselhaus Splitting with 3D Chiral Spin Texture in IrBiSe
Materials with giant spin splitting are desired for spintronic applications. The fabrications of spintronic devices from half metals with one spin direction are often hampered, however, by stray magnetic fields, domain walls, short spin coherence times, scattering on magnetic atoms or magnetically active interfaces, and other characteristics that come along with the magnetism. The surfaces of topological insulators, or Dirac/Weyl semimetals, could be an alternative, but production of high-quality thin films without the presence of the bulk states at the Fermi energy remains very challenging. Here, by utilizing angle-resolved photoemission spectroscopy, a record-high Dresselhaus spin–orbit splitting of the bulk state in the nonmagnetic IrBiSe is found. The band structure calculations indicate that the splitting band is fully spin-polarized with 3D chiral spin texture. As a source of spin-polarized electrons, lightly doped IrBiSe is expected to generate electric-field-controlled spin-polarized currents, free from back scattering, and could host triplet and Fulde–Ferrel–Larkin–Ovchinnikov (FFLO) superconductivity. © 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei
Kagome surface states and weak electronic correlation in vanadium-kagome metals
RV6Sn6 (R = Y and lanthanides) with two-dimensional vanadium-kagome surface
states is an ideal platform to investigate kagome physics and manipulate the
kagome features to realize novel phenomena. Utilizing the micron-scale
spatially resolved angle-resolved photoemission spectroscopy and
first-principles calculations, we report a systematical study of the electronic
structures of RV6Sn6 (R = Gd, Tb, and Lu) on the two cleaved surfaces, i.e.,
the V- and RSn1-terminated (001) surfaces. The calculated bands without any
renormalization match well with the main ARPES dispersive features, indicating
the weak electronic correlation in this system. We observe 'W'-like kagome
surface states around the Brillouin zone corners showing R-element-dependent
intensities, which is probably due to various coupling strengths between V and
RSn1 layers. Our finding suggests an avenue for tuning electronic states by
interlayer coupling based on two-dimensional kagome lattices
A polymorphism in porcine miR-22 is associated with pork color
MicroRNAs (miRNAs) are posttranscriptional regulators that play key roles in meat color regulation. Changes in miRNA expression affect their target mRNAs, leading to multifunctional effects on biological processes and phenotypes. In this study, a G > A mutation site located upstream of the precursor miR-22 sequence in Suhuai pigs was significantly correlated with the meat color parameter a*(redness) of the porcine longissimus dorsi (LD) muscle. AA genotype individuals had the highest average meat color a* value and the lowest miR-22 level. When G > A mutation was performed in the miR-22 overexpression vector, miR-22 expression significantly decreased. Considering that Ca2+ homeostasis is closely related to pig meat color, our results further demonstrated that ELOVL6 is a direct target of miR-22 in pigs. The effects of miR-22 on skeletal muscle intracellular Ca2+ were partially caused by the suppression of ELOVL6 expression
Observation of electronic nematicity driven by three-dimensional charge density wave in kagome lattice KVSb
Kagome superconductors AVSb (A = K, Rb, Cs) provide a fertile
playground for studying various intriguing phenomena such as non-trivial band
topology, superconductivity, giant anomalous Hall effect, and charge density
wave (CDW). Remarkably, the recent discovery of symmetric nematic phase
prior to the superconducting state in AVSb has drawn enormous
attention, as the unusual superconductivity might inherit the symmetry of the
nematic phase. Although many efforts have been devoted to resolve the charge
orders using real-space microscopy and transport measurements, the direct
evidence on the rotation symmetry breaking of the electronic structure in the
CDW state from the reciprocal space is still rare. The underlying mechanism is
still ambiguous. Here, utilizing the micron-scale spatially resolved
angle-resolved photoemission spectroscopy, we observed the fingerprint of band
folding in the CDW phase of KVSb, which yet demonstrates the
unconventional unidirectionality, and is indicative of the rotation symmetry
breaking from to . We then pinpointed that the interlayer coupling
between adjacent planes with -phase offset in the 222 CDW
phase would lead to the preferred twofold symmetric electronic structure.
Time-reversal symmetry is further broken at temperatures below 40 K as
characterized by giant anomalous Hall effect triggered by weak magnetic fields.
These rarely observed unidirectional back-folded bands with time-reversal
symmetry breaking in KVSb may provide important insights into its
peculiar charge order and superconductivity