52 research outputs found
Interlayer-spin-interaction-driven Sliding Ferroelectricity in a van der Waals Magnetic Heterobilayer
Sliding ferroelectricity is widely existed in van der Waals (vdW)
two-dimensional (2D) multilayers, exhibiting great potential on low-dissipation
non-volatile memories. However, in a vdW heterostructure, interlayer sliding
usually fails to reverse or distinctly change the electric polarization, which
makes the electrical control difficult in practice. Here we propose that in a
vdW magnetic system, the interlayer spin interaction could provide an extra
degree-of-freedom to remarkably tune the electric polarization. Combining
tight-binding model analysis and first-principles calculations, we show that in
the CrI3/MnSe2 and other vdW magnetic heterobilayers, the switching of the
interlayer magnetic order can greatly change, even reverse the off-plane
electronic polarization. Furthermore, interlayer sliding causes a non-volatile
switching of the magnetic order and, thus, reverses the electric polarization,
suggesting a non-volatile magnetoelectric coupling effect. These findings will
significantly advances the development of 2D ferroelectrics and multiferroics
for spintronic applications
Bibliometric analysis of social commerce research
Recently, social commerce has attracted the attention from both academics and practitioners and became a significant emerging research area. In this paper, bibliometric analysis has been applied to identify the characteristics and the developments of social commerce research. Based on the definition, we conduct a systematic review of social commerce research by synthesizing 1900 publications published between 2003 and 2018 in Web of Science. The 1900 publications cover 4033 authors, 724 journals, 79 countries or territories, and 1648 institutions. Furthermore,‘Computers in Human Behavior’ is the key journal publishing on social commerce research, and the USA, China and England are the countries that dominate the publication production. It can be concluded that there is much collaborative research in the social commerce domain as multi-authored publications make up the majority of all publications. In addition, three main research areas can be distinguished based on LLR (log-likelihood ratio): (1) the development trend of social commerce, (2) the relationship between customers and vendors, and (3) consumer trust in the context of social shopping. We believe that this review can provide some guidelines for future research
Web3D learning framework for 3D shape retrieval based on hybrid convolutional neural networks
With the rapid development of Web3D technologies, sketch-based model retrieval has become an increasingly important challenge, while the application of Virtual Reality and 3D technologies has made shape retrieval of furniture over a web browser feasible. In this paper, we propose a learning framework for shape retrieval based on two Siamese VGG-16 Convolutional Neural Networks (CNNs), and a CNN-based hybrid learning algorithm to select the best view for a shape. In this algorithm, the AlexNet and VGG-16 CNN architectures are used to perform classification tasks and to extract features, respectively. In addition, a feature fusion method is used to measure the similarity relation of the output features from the two Siamese networks. The proposed framework can provide new alternatives for furniture retrieval in the Web3D environment. The primary innovation is in the employment of deep learning methods to solve the challenge of obtaining the best view of 3D furniture, and to address cross-domain feature learning problems. We conduct an experiment to verify the feasibility of the framework and the results show our approach to be superior in comparison to many mainstream state-of-the-art approaches
Offsetting disagreement and security prices
We propose that investor beliefs frequently “cross” in the sense that an investor may like company A but dislike company B, whereas another investor may like company B but dislike company A. Such belief-crossing makes it almost impossible to construct a portfolio that is composed solely of every investor’s most favored companies. This causes the level of excitement for portfolios to be generally lower than the levels of excitement that individual companies generate among their most fervent supporters. Coupled with short-sale constraints, wherein prices are set by the most optimistic investors, this causes portfolios to trade at discounts. Utilizing several settings whereby the value of a portfolio and the values of the underlying components can be evaluated separately (e.g., closed-end funds), we present evidence supporting our proposition that, in financial markets, the “whole” is often less than the “sum of its parts.
Translate the Beauty in Songs: Jointly Learning to Align Melody and Translate Lyrics
Song translation requires both translation of lyrics and alignment of music
notes so that the resulting verse can be sung to the accompanying melody, which
is a challenging problem that has attracted some interests in different aspects
of the translation process. In this paper, we propose Lyrics-Melody Translation
with Adaptive Grouping (LTAG), a holistic solution to automatic song
translation by jointly modeling lyrics translation and lyrics-melody alignment.
It is a novel encoder-decoder framework that can simultaneously translate the
source lyrics and determine the number of aligned notes at each decoding step
through an adaptive note grouping module. To address data scarcity, we
commissioned a small amount of training data annotated specifically for this
task and used large amounts of augmented data through back-translation.
Experiments conducted on an English-Chinese song translation data set show the
effectiveness of our model in both automatic and human evaluation.Comment: 13 page
Unveiling the Siren's Song: Towards Reliable Fact-Conflicting Hallucination Detection
Large Language Models (LLMs), such as ChatGPT/GPT-4, have garnered widespread
attention owing to their myriad of practical applications, yet their adoption
has been constrained by issues of fact-conflicting hallucinations across web
platforms. The assessment of factuality in text, produced by LLMs, remains
inadequately explored, extending not only to the judgment of vanilla facts but
also encompassing the evaluation of factual errors emerging in complex
inferential tasks like multi-hop, and etc. In response, we introduce FactCHD, a
fact-conflicting hallucination detection benchmark meticulously designed for
LLMs. Functioning as a pivotal tool in evaluating factuality within
"Query-Respons" contexts, our benchmark assimilates a large-scale dataset,
encapsulating a broad spectrum of factuality patterns, such as vanilla,
multi-hops, comparison, and set-operation patterns. A distinctive feature of
our benchmark is its incorporation of fact-based chains of evidence, thereby
facilitating comprehensive and conducive factual reasoning throughout the
assessment process. We evaluate multiple LLMs, demonstrating the effectiveness
of the benchmark and current methods fall short of faithfully detecting factual
errors. Furthermore, we present TRUTH-TRIANGULATOR that synthesizes reflective
considerations by tool-enhanced ChatGPT and LoRA-tuning based on Llama2, aiming
to yield more credible detection through the amalgamation of predictive results
and evidence. The benchmark dataset and source code will be made available in
https://github.com/zjunlp/FactCHD.Comment: Work in progres
Disorder and diffuse scattering in single-chirality (TaSe)I crystals
The quasi-one-dimensional chiral compound (TaSe)I has been
extensively studied as a prime example of a topological Weyl semimetal. Upon
crossing its phase transition temperature 263 K,
(TaSe)I exhibits incommensurate charge density wave (CDW) modulations
described by the well-defined propagation vector (0.05, 0.05, 0.11),
oblique to the TaSe chains. Although optical and transport properties
greatly depend on chirality, there is no systematic report about chiral domain
size for (TaSe)I. In this study, our single-crystal scattering
refinements reveal a bulk iodine deficiency, and Flack parameter measurements
on multiple crystals demonstrate that separate (TaSe)I crystals have
uniform handedness, supported by direct imaging and helicity dependent THz
emission spectroscopy. Our single-crystal X-ray scattering and calculated
diffraction patterns identify multiple diffuse features and create a real-space
picture of the temperature-dependent (TaSe)I crystal structure. The
short-range diffuse features are present at room temperature and decrease in
intensity as the CDW modulation develops. These transverse displacements, along
with electron pinning from the iodine deficiency, help explain why
(TaSe)I behaves as an electronic semiconductor at temperatures above
and below , despite a metallic band structure calculated from
density functional theory of the ideal structure.Comment: 24 pages, 20 figures, 3 table
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