119 research outputs found
Vortex patterns and the critical rotational frequency in rotating dipolar Bose-Einstein condensates
Based on the two-dimensional mean-field equations for pancake-shaped dipolar
Bose-Einstein condensates in a rotating frame with both attractive and
repulsive dipole-dipole interaction (DDI) as well as arbitrary polarization
angle, we study the profiles of the single vortex state and show how the
critical rotational frequency change with the s-wave contact interaction
strengths, DDI strengths and the polarization angles. In addition, we find
numerically that at the `magic angle' , the
critical rotational frequency is almost independent of the DDI strength. By
numerically solving the dipolar GPE at high rotational speed, we identify
different patterns of vortex lattices which strongly depend on the polarization
direction. As a result, we undergo a study of vortex lattice structures for the
whole regime of polarization direction and find evidence that the vortex
lattice orientation tends to be aligned with the direction of the dipoles
The interaction between copper species and pyrite surfaces in copper cyanide solutions
The adsorption of copper ions and the formation of a copper sulfide phase on pyrite surfaces are of vital importance to alter the surface property of pyrite and determine its fate either to be rejected in the flotation of polymetallic sulfide ores or to be recovered in the flotation of pyritic gold ores. Cyanide and copper may co-exist in the process water with complicated speciation. The objective of this study is to understand the interaction between copper cyanide species and pyrite and clarify the possible adsorption of copper on pyrite surfaces from cyanide-bearing solutions. Surface-enhanced Raman spectroscopy and electrochemical measurements were used to determine the reaction products formed on pyrite surfaces. It was found that Cu(I)-bearing species were incorporated into pyrite, forming a CuS-like sulfide from copper cyanide solutions at a more oxidizing potential, while a Cu2S-like sulfide formed at a more reducing potential. The amount of copper deposited on pyrite was significantly improved at a more reducing potential at which the pyrite surface tended to be FeS-like. In addition, these Cu(I)-sulfides on pyrite surfaces were dissolved by cyanide-bearing species at a high CN/Cu ratio, compromising the total amount of copper uptake
Exploring Structured Semantic Prior for Multi Label Recognition with Incomplete Labels
Multi-label recognition (MLR) with incomplete labels is very challenging.
Recent works strive to explore the image-to-label correspondence in the
vision-language model, \ie, CLIP, to compensate for insufficient annotations.
In spite of promising performance, they generally overlook the valuable prior
about the label-to-label correspondence. In this paper, we advocate remedying
the deficiency of label supervision for the MLR with incomplete labels by
deriving a structured semantic prior about the label-to-label correspondence
via a semantic prior prompter. We then present a novel Semantic Correspondence
Prompt Network (SCPNet), which can thoroughly explore the structured semantic
prior. A Prior-Enhanced Self-Supervised Learning method is further introduced
to enhance the use of the prior. Comprehensive experiments and analyses on
several widely used benchmark datasets show that our method significantly
outperforms existing methods on all datasets, well demonstrating the
effectiveness and the superiority of our method. Our code will be available at
https://github.com/jameslahm/SCPNet.Comment: Accepted by IEEE/CVF Conference on Computer Vision and Pattern
Recognition (CVPR) 202
Probing Product Description Generation via Posterior Distillation
In product description generation (PDG), the user-cared aspect is critical
for the recommendation system, which can not only improve user's experiences
but also obtain more clicks. High-quality customer reviews can be considered as
an ideal source to mine user-cared aspects. However, in reality, a large number
of new products (known as long-tailed commodities) cannot gather sufficient
amount of customer reviews, which brings a big challenge in the product
description generation task. Existing works tend to generate the product
description solely based on item information, i.e., product attributes or title
words, which leads to tedious contents and cannot attract customers
effectively. To tackle this problem, we propose an adaptive posterior network
based on Transformer architecture that can utilize user-cared information from
customer reviews. Specifically, we first extend the self-attentive Transformer
encoder to encode product titles and attributes. Then, we apply an adaptive
posterior distillation module to utilize useful review information, which
integrates user-cared aspects to the generation process. Finally, we apply a
Transformer-based decoding phase with copy mechanism to automatically generate
the product description. Besides, we also collect a large-scare Chinese product
description dataset to support our work and further research in this field.
Experimental results show that our model is superior to traditional generative
models in both automatic indicators and human evaluation
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