103 research outputs found
A Diffusion Weighted Graph Framework for New Intent Discovery
New Intent Discovery (NID) aims to recognize both new and known intents from
unlabeled data with the aid of limited labeled data containing only known
intents. Without considering structure relationships between samples, previous
methods generate noisy supervisory signals which cannot strike a balance
between quantity and quality, hindering the formation of new intent clusters
and effective transfer of the pre-training knowledge. To mitigate this
limitation, we propose a novel Diffusion Weighted Graph Framework (DWGF) to
capture both semantic similarities and structure relationships inherent in
data, enabling more sufficient and reliable supervisory signals. Specifically,
for each sample, we diffuse neighborhood relationships along semantic paths
guided by the nearest neighbors for multiple hops to characterize its local
structure discriminately. Then, we sample its positive keys and weigh them
based on semantic similarities and local structures for contrastive learning.
During inference, we further propose Graph Smoothing Filter (GSF) to explicitly
utilize the structure relationships to filter high-frequency noise embodied in
semantically ambiguous samples on the cluster boundary. Extensive experiments
show that our method outperforms state-of-the-art models on all evaluation
metrics across multiple benchmark datasets. Code and data are available at
https://github.com/yibai-shi/DWGF.Comment: EMNLP 2023 Mai
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Study of the improvement of the multifractal spatial downscaling by the random forest regression model considering spatial heterogeneity
Enhanced Optoelectronic Response in Bilayer Lateral Heterostructures of Transition Metal Dichalcogenides
Two-dimensional lateral heterojunctions are basic components for low-power
and flexible optoelectronics. In contrast to monolayers, devices based on
few-layer lateral heterostructures could offer superior performance due to
their lower susceptibility to environmental conditions. Here, we report the
controlled synthesis of multi-junction bilayer lateral heterostructures based
on MoS2-WS2 and MoSe2-WSe2, where the hetero-junctions are created via
sequential lateral edge-epitaxy that happens simultaneously in both the first
and the second layer. With respect to their monolayer counterparts, bilayer
lateral heterostructures yield nearly one order of magnitude higher
rectification currents. They also display a clear photovoltaic response, with
short circuit currents ~103 times larger than those extracted from the
monolayers, in addition to room-temperature electroluminescence. The superior
performance of bilayer heterostructures significantly expands the
functionalities of 2D crystals
The role of miRNAs in Behçet’s disease
The symptoms of Behçet’s disease (BD), a multisystemic condition with autoimmune and inflammation as hallmarks, include arthritis, recurring oral and vaginal ulcers, skin rashes and lesions, and involvement of the nervous, gastrointestinal, and vascular systems. Non-coding RNAs (ncRNAs), including microRNAs (miRNAs), long non-coding RNAs (lncRNAs), and circular RNAs (circRNAs), may be important regulators of inflammation and autoimmune disease. These ncRNAs are essential to the physiological and pathophysiological disease course, and miRNA in particular has received significant attention for its role and function in BD and its potential use as a diagnostic biomarker in recent years. Although promising as therapeutic targets, miRNAs must be studied further to fully comprehend how miRNAs in BD act biologically
Extraordinary Thermoelectric Properties of Topological Surface States in Quantum-Confined Cd3As2 Thin Films
Topological insulators and semimetals have been shown to possess intriguing
thermoelectric properties promising for energy harvesting and cooling
applications. However, thermoelectric transport associated with the Fermi arc
topological surface states on topological Dirac semimetals remains less
explored. In this work, we systematically examine thermoelectric transport in a
series of topological Dirac semimetal Cd3As2 thin films grown by molecular beam
epitaxy. Surprisingly, we find significantly enhanced Seebeck effect and
anomalous Nernst effect at cryogenic temperatures when the Cd3As2 layer is
thin. Combining angle-dependent quantum oscillation analysis,
magnetothermoelectric measurement, transport modelling and first-principles
simulation, we isolate the contributions from bulk and surface conducting
channels and attribute the unusual thermoeletric properties to the topological
surface states. Our analysis showcases the rich thermoelectric transport
physics in quantum-confined topological Dirac semimetal thin films and suggests
new routes to achieving high thermoelectric performance at cryogenic
temperatures
Genome-wide characterization of RR gene family members in Zanthoxylum armatum and the subsequent functional characterization of the C-type RR
Response Regulators (RRs) are crucial regulators in plant development and stress responses, comprising A-type, B-type, C-type, and pseudo-RR subfamilies. However, previous studies have often focused on specific subfamilies, which restricts our understanding of the complete RR gene family. In this study, we conducted a comprehensive analysis of 63 RR members from Zanthoxylum armatum, using phylogenetic relationships, motif composition, cis-acting elements, gene duplication and collinearity analyses. Segmental repeats among ZaRR genes enhanced the various environmental adaptabilities of Z. armatum, and the B-type ZaRR exhibited significant collinearity with the RRs in P. trichocarpa and C. sinensis. Cis-element analysis indicated ZaRRs play a significant role in abiotic stress and phytohormone pathways, particularly in light, drought, cold, abscisic acid (ABA) and salicylic acid (SA) responses. Abundant Ethylene Response Factor (ERF) and reproduction-associated binding sites in ZaRR promoters suggested their roles in stress and reproductive processes. A-type ZaRRs were implicated in plant vegetative and reproductive growth, whereas B-type ZaRRs contributed to both growth and stress responses. C-type ZaRRs were associated with plant reproductive growth, whereas pseudo-RRs may function in plant stress responses, such as water logging, cold, and response to ethylene (ETH), SA, and jasmonic acid (JA). Ectopic expression of ZaRR24, a C-type RR, inhibits growth, induces early flowering, and shortens fruit length in Arabidopsis. ZaRR24 overexpression also affected the expression of A- and B-type RRs, as well as floral meristem and organ identity genes. These findings establish a solid and comprehensive foundation for RR gene research in Z. armatum, and provide a platform for investigating signal transduction in other woody plants
Writing and detecting topological charges in exfoliated FeGeTe
FeGeTe is a promising two-dimensional (2D) van der Waals (vdW)
magnet for practical applications, given its magnetic properties. These include
Curie temperatures above room temperature, and topological spin textures (TST
or both merons and skyrmions), responsible for a pronounced anomalous Hall
effect (AHE) and its topological counterpart (THE), which can be harvested for
spintronics. Here, we show that both the AHE and THE can be amplified
considerably by just adjusting the thickness of exfoliated FeGeTe,
with THE becoming observable even in zero magnetic field due to a field-induced
unbalance in topological charges. Using a complementary suite of techniques,
including electronic transport, Lorentz transmission electron microscopy, and
micromagnetic simulations, we reveal the emergence of substantial coercive
fields upon exfoliation, which are absent in the bulk, implying
thickness-dependent magnetic interactions that affect the TST. We detected a
``magic" thickness 30 nm where the formation of TST is maximized,
inducing large magnitudes for the topological charge density ( cm), and the concomitant anomalous ( cm) and topological ( cm) Hall resistivities at ~ 120 K. These values for
and are higher than those
found in magnetic topological insulators and, so far, the largest reported for
2D magnets. The hitherto unobserved THE under zero magnetic field could provide
a platform for the writing and electrical detection of TST aiming at
energy-efficient devices based on vdW ferromagnets.Comment: 45 pages with supporting information file, 5 main figures. Accepted
ACS Nano 202
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