1,640 research outputs found
Possible molecular states from interactions of charmed baryons
In this work, we perform a systematic study of possible molecular states
composed of two charmed baryons including hidden-charm systems
, , and
, and corresponding double-charm systems
, , and
. With the help of the heavy quark chiral effective
Lagrangians, the interactions are described with , , ,
, , and exchanges. The potential kernels are
constructed, and inserted into the quasipotential Bethe-Salpeter equation. The
bound states from the interactions considered is studied by searching for the
poles of the scattering amplitude. The results suggest that strong attractions
exist in both hidden-charm and double-charm systems considered in the current
work, and bound states can be produced in most of the systems. More experiment
studies about these molecular states are suggested though the nucleon-nucleon
collison at LHC and nucleon-antinucleon collison at .Comment: 7 pages, 5 figure
Quantum Entanglement in the S=1/2 Spin Ladder with Ring Exchange
In this paper we study the concurrence and the block-block entanglement in
the spin ladder with four-spin ring exchange by the exact
diagonalization method of finite cluster of spins. The relationship between the
global phase diagram and the ground-state entanglement is investigated. It is
shown that the block-block entanglement of different block size and geometry
manifests richer information of the system. We find that the extremal point of
the two-site block-block entanglement on the rung locates a transition point
exactly due to SU(4) symmetry at this point. The scaling behavior of the
block-block entanglement is discussed. Our results suggest that the block-block
entanglement can be used as a convenient marker of quantum phase transition in
some complex spin systems.Comment: 5 pages, 7 figure
Clinical effects research of the excision of pterygium combined with limbal epithelial autograft with conjunctival grafting on recurrent pterygium
AIM: To observe the clinical effects of the excision of pterygium combined with limbal epithelial autograft with conjunctival grafting on recurrent pterygium. <p>METHODS: Totally 84 patients(84 eyes)with first recurrent pterygium were allocated two groups: excision pterygium with limbal epithelial autograft with conjunctival(group A, 43 cases with 43 eyes)and excision of pterygium with conjunctival autograft(group B, 41 cases with 41 eyes), the post-operative follow-up period of 12 months, we analyzed the repair time of epithelium, tear break-up time(1 month and 3 months), Schirmer l test(1 month and 3 months), corneal fluorescence staining test(1 month and 3 months), and recurrent rate. <p>RESULTS: The group A had a shorter repair time of epithelium and lower recurrent rate, compared with the group B, which had statistically significant difference(<i>P</i><0.05), but there was no statistically significant difference in the tear break-up time, corneal fluorescence staining test and the Schirmer l test in 1 month and 3 months between the two groups(<i>P</i>>0.05). <p>CONCLUSION:Limbal epithelial autograft with conjunctival transplantation is a convenient, safe, effective method for the treatment of recurrent pterygium
Developer-Intent Driven Code Comment Generation
Existing automatic code comment generators mainly focus on producing a
general description of functionality for a given code snippet without
considering developer intentions. However, in real-world practice, comments are
complicated, which often contain information reflecting various intentions of
developers, e.g., functionality summarization, design rationale, implementation
details, code properties, etc. To bridge the gap between automatic code comment
generation and real-world comment practice, we define Developer-Intent Driven
Code Comment Generation, which can generate intent-aware comments for the same
source code with different intents. To tackle this challenging task, we propose
DOME, an approach that utilizes Intent-guided Selective Attention to explicitly
select intent-relevant information from the source code, and produces various
comments reflecting different intents. Our approach is evaluated on two
real-world Java datasets, and the experimental results show that our approach
outperforms the state-of-the-art baselines. A human evaluation also confirms
the significant potential of applying DOME in practical usage, enabling
developers to comment code effectively according to their own needs
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