105 research outputs found
Exploring Data Geometry for Continual Learning
Continual learning aims to efficiently learn from a non-stationary stream of
data while avoiding forgetting the knowledge of old data. In many practical
applications, data complies with non-Euclidean geometry. As such, the commonly
used Euclidean space cannot gracefully capture non-Euclidean geometric
structures of data, leading to inferior results. In this paper, we study
continual learning from a novel perspective by exploring data geometry for the
non-stationary stream of data. Our method dynamically expands the geometry of
the underlying space to match growing geometric structures induced by new data,
and prevents forgetting by keeping geometric structures of old data into
account. In doing so, making use of the mixed curvature space, we propose an
incremental search scheme, through which the growing geometric structures are
encoded. Then, we introduce an angular-regularization loss and a
neighbor-robustness loss to train the model, capable of penalizing the change
of global geometric structures and local geometric structures. Experiments show
that our method achieves better performance than baseline methods designed in
Euclidean space.Comment: CVPR 202
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MAP3Kinase-dependent SnRK2-kinase activation is required for abscisic acid signal transduction and rapid osmotic stress response.
Abiotic stresses, including drought and salinity, trigger a complex osmotic-stress and abscisic acid (ABA) signal transduction network. The core ABA signalling components are snf1-related protein kinase2s (SnRK2s), which are activated by ABA-triggered inhibition of type-2C protein-phosphatases (PP2Cs). SnRK2 kinases are also activated by a rapid, largely unknown, ABA-independent osmotic-stress signalling pathway. Here, through a combination of a redundancy-circumventing genetic screen and biochemical analyses, we have identified functionally-redundant MAPKK-kinases (M3Ks) that are necessary for activation of SnRK2 kinases. These M3Ks phosphorylate a specific SnRK2/OST1 site, which is indispensable for ABA-induced reactivation of PP2C-dephosphorylated SnRK2 kinases. ABA-triggered SnRK2 activation, transcription factor phosphorylation and SLAC1 activation require these M3Ks in vitro and in plants. M3K triple knock-out plants show reduced ABA sensitivity and strongly impaired rapid osmotic-stress-induced SnRK2 activation. These findings demonstrate that this M3K clade is required for ABA- and osmotic-stress-activation of SnRK2 kinases, enabling robust ABA and osmotic stress signal transduction
PP-005 Research on medical sensitivity of Chinese herbs of Tujia minority against ureaplasma urealyticum in vitro
Photocatalysis and self-cleaning from g-C3N4 coated cotton fabrics under sunlight irradiation
Signal of the pion string at high-energy collisions
We study the possible signals of a pion string associated with the QCD chiral
phase transition in LHC Pb - Pb collision at energy TeV. In
terms of the Kibble-Zurek mechanism we discuss the production and evolution of
the pion string. The pion string is not topologically stable, it decays into
neutral pions and sigma mesons which in turn decay into pions. Our results show
that all the neutral pions from the pion string are distributed at the low
momentum and the ratio of neutral to charged pions from the pion string
violates the isospin symmetry. For the momentum spectra of the total pions, the
signal from the sigma particle decay which is from the pion string will be
affected by the large decay width of the sigma significantly.Comment: 8 pages, 3 figures, one reference added, title changed, version
accepted for publication in Phys. Rev.
Silver nanoprism-loaded eggshell membrane: a facile platform for in situ SERS monitoring of catalytic reactions
We reported the fabrication of an in situ surface-enhanced Raman scattering (SERS) monitoring platform, comprised of a porous eggshell membrane (ESM) bioscaffold loaded with Ag nanoprism via an electrostatic self-assembly approach. The localized surface plasmon resonance (LSPR) property of silver nanoprism leads to the blue color of the treated ESMs. UV-vis diffuse reflectance spectroscopy, scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) measurements were employed to observe the microstructure and surface property of Ag nanoprisms on the ESMs. The silver nanoprism-loaded eggshell membrane (AgNP@ESM) exhibited strong catalytic activity for the reduction of 4-nitrophenol by sodium borohydride (NaBH4) and it can be easily recovered and reused for more than six cycles. Significantly, the composites also display excellent SERS efficiency, allowing the in situ SERS monitoring of molecular transformation in heterogeneous catalysis. The results indicate that the AgNP@ESM biocomposite can achieve both SERS and catalytic functionalities simultaneously in a single entity with high performance, which promotes the potential applications of ESM modified with functional materials
Corin is down-regulated and exerts cardioprotective action via activating pro-atrial natriuretic peptide pathway in diabetic cardiomyopathy
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