6,833 research outputs found
Chiral geometry of higher excited bands in triaxial nuclei with particle-hole configuration
The lowest six rotational bands have been studied in the particle-rotor model
with the particle-hole configuration
and different triaxiality parameter . Both constant and spin-dependent
variable moments of inertial (CMI and VMI) are introduced. The energy spectra,
electromagnetic transition probabilities, angular momentum components and
-distribution have been examined. It is shown that, besides the band 1 and
band 2, the predicted band 3 and band 4 in the calculations of both CMI and VMI
for atomic nuclei with could be interpreted as chiral doublet
bands.Comment: 4 pages, 4 figure
Circle Feature Graphormer: Can Circle Features Stimulate Graph Transformer?
In this paper, we introduce two local graph features for missing link
prediction tasks on ogbl-citation2. We define the features as Circle Features,
which are borrowed from the concept of circle of friends. We propose the
detailed computing formulas for the above features. Firstly, we define the
first circle feature as modified swing for common graph, which comes from
bipartite graph. Secondly, we define the second circle feature as bridge, which
indicates the importance of two nodes for different circle of friends. In
addition, we firstly propose the above features as bias to enhance graph
transformer neural network, such that graph self-attention mechanism can be
improved. We implement a Circled Feature aware Graph transformer (CFG) model
based on SIEG network, which utilizes a double tower structure to capture both
global and local structure features. Experimental results show that CFG
achieves the state-of-the-art performance on dataset ogbl-citation2.Comment: 3 pages, 2 figures, 1 table, 31 references, manuscript in preparatio
Diverse biological effects of glycosyltransferase genes from Tartary buckwheat
Background: Tartary buckwheat (Fagopyrum tataricum) is an edible cereal crop whose sprouts have been marketed and commercialized for their higher levels of anti-oxidants, including rutin and anthocyanin. UDP-glucose flavonoid glycosyltransferases (UFGTs) play an important role in the biosynthesis of flavonoids in plants. So far, few studies are available on UFGT genes that may play a role in tartary buckwheat flavonoids biosynthesis. Here, we report on the identification and functional characterization of seven UFGTs from tartary buckwheat that are potentially involved in flavonoid biosynthesis (and have varying effects on plant growth and development when overexpressed in Arabidopsis thaliana.)
Results: Phylogenetic analysis indicated that the potential function of the seven FtUFGT proteins, FtUFGT6, FtUFGT7, FtUFGT8, FtUFGT9, FtUFGT15, FtUFGT40, and FtUFGT41, could be divided into three Arabidopsis thaliana functional subgroups that are involved in flavonoid biosynthesis of and anthocyanin accumulation. A significant positive correlation between FtUFGT8 and FtUFGT15 expression and anthocyanin accumulation capacity was observed in the tartary buckwheat seedlings after cold stress. Overexpression in Arabidopsis thaliana showed that FtUFGT8, FtUFGT15, and FtUFGT41 significantly increased the anthocyanin content in transgenic plants. Unexpectedly, overexpression of FtUFGT6, while not leading to enhanced anthocyanin accumulation, significantly enhanced the growth yield of transgenic plants. When wild-type plants have only cotyledons, most of the transgenic plants of FtUFGT6 had grown true leaves. Moreover, the growth speed of the oxFtUFGT6 transgenic plant root was also significantly faster than that of the wild type. At later growth, FtUFGT6 transgenic plants showed larger leaves, earlier twitching times and more tillers than wild type, whereas FtUFGT15 showed opposite results.
Conclusions: Seven FtUFGTs were isolated from tartary buckwheat. FtUFGT8, FtUFGT15, and FtUFGT41 can significantly increase the accumulation of total anthocyanins in transgenic plants. Furthermore, overexpression of FtUFGT6 increased the overall yield of Arabidopsis transgenic plants at all growth stages. However, FtUFGT15 shows the opposite trend at later growth stage and delays the growth speed of plants. These results suggested that the biological function of FtUFGT genes in tartary buckwheat is diverse
StrokeGAN: Reducing Mode Collapse in Chinese Font Generation via Stroke Encoding
The generation of stylish Chinese fonts is an important problem involved in
many applications. Most of existing generation methods are based on the deep
generative models, particularly, the generative adversarial networks (GAN)
based models. However, these deep generative models may suffer from the mode
collapse issue, which significantly degrades the diversity and quality of
generated results. In this paper, we introduce a one-bit stroke encoding to
capture the key mode information of Chinese characters and then incorporate it
into CycleGAN, a popular deep generative model for Chinese font generation. As
a result we propose an efficient method called StrokeGAN, mainly motivated by
the observation that the stroke encoding contains amount of mode information of
Chinese characters. In order to reconstruct the one-bit stroke encoding of the
associated generated characters, we introduce a stroke-encoding reconstruction
loss imposed on the discriminator. Equipped with such one-bit stroke encoding
and stroke-encoding reconstruction loss, the mode collapse issue of CycleGAN
can be significantly alleviated, with an improved preservation of strokes and
diversity of generated characters. The effectiveness of StrokeGAN is
demonstrated by a series of generation tasks over nine datasets with different
fonts. The numerical results demonstrate that StrokeGAN generally outperforms
the state-of-the-art methods in terms of content and recognition accuracies, as
well as certain stroke error, and also generates more realistic characters.Comment: 10 pages, our codes and data are available at:
https://github.com/JinshanZeng/StrokeGA
Intrinsically Motivated Reinforcement Learning based Recommendation with Counterfactual Data Augmentation
Deep reinforcement learning (DRL) has been proven its efficiency in capturing
users' dynamic interests in recent literature. However, training a DRL agent is
challenging, because of the sparse environment in recommender systems (RS), DRL
agents could spend times either exploring informative user-item interaction
trajectories or using existing trajectories for policy learning. It is also
known as the exploration and exploitation trade-off which affects the
recommendation performance significantly when the environment is sparse. It is
more challenging to balance the exploration and exploitation in DRL RS where RS
agent need to deeply explore the informative trajectories and exploit them
efficiently in the context of recommender systems. As a step to address this
issue, We design a novel intrinsically ,otivated reinforcement learning method
to increase the capability of exploring informative interaction trajectories in
the sparse environment, which are further enriched via a counterfactual
augmentation strategy for more efficient exploitation. The extensive
experiments on six offline datasets and three online simulation platforms
demonstrate the superiority of our model to a set of existing state-of-the-art
methods
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