227 research outputs found
Predictions of the Strange partner of in the quark delocalization color screening model
Inspired by the detection of tetraquark state by LHCb Collaboration,
we preform a systemical investigation of the low-lying doubly heavy charm
tetraquark states with strangeness in the quark delocalization color screening
model in the present work. Two kinds of configurations, the meson-meson
configuration and diquark-antidiquark configuration, are considered in the
calculation. Our estimations indicate that the coupled channel effects play
important role in the multiquark system, and a bound state with
and a resonance state with have been predicted. The mass of the
bound state is evaluated to be MeV, while the mass and width
of the resonance are determined to be MeV and MeV, respectively.Comment: 12 pages, 4 figure, 7 table
BiRA-Net: Bilinear Attention Net for Diabetic Retinopathy Grading
Diabetic retinopathy (DR) is a common retinal disease that leads to
blindness. For diagnosis purposes, DR image grading aims to provide automatic
DR grade classification, which is not addressed in conventional research
methods of binary DR image classification. Small objects in the eye images,
like lesions and microaneurysms, are essential to DR grading in medical
imaging, but they could easily be influenced by other objects. To address these
challenges, we propose a new deep learning architecture, called BiRA-Net, which
combines the attention model for feature extraction and bilinear model for
fine-grained classification. Furthermore, in considering the distance between
different grades of different DR categories, we propose a new loss function,
called grading loss, which leads to improved training convergence of the
proposed approach. Experimental results are provided to demonstrate the
superior performance of the proposed approach.Comment: Accepted at ICIP 201
Climate effects of the Three Gorges Reservoir as simulated by a high resolution double nested regional climate model
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Possible triply heavy tetraquark states
In the present work, the triply heavy tetraquarks states
with and with all possible quantum numbers are
systematically investigated in the framework of the chiral quark model with the
resonance ground method. Two kinds of structures, including the meson-meson
configuration (the color-singlet channels and the hidden-color channels) and
the diquark-antidiquark configuration (the color sextet-antisextet and the
color triplet-antitriplet), are considered. In the considered system, several
bound states are obtained for the ,
and tetraquarks. From the present
estimations, we find that the coupled channel effect is of great significance
for forming the below thresholds tetraquark states, which are stable for strong
decays
The explanation of some exotic states in the tetraquark system
Inspired by the recent observation of , and
by the LHCb Collaboration and some exotic resonances such as
, , etc. by several experiment collaborations, the
tetraquark systems with , and are
systematically investigated in the framework of the quark delocalization color
screening model(QDCSM). Two structures, the meson-meson and diquark-antidiquark
structures, as well as the channel-coupling of all channels of these two
configurations are considered in this work. The numerical results indicate that
the molecular bound state with can be supposed
to explain the . Besides, by using the stabilization method,
several resonant states are obtained. There are four states
around the resonance mass 4035 MeV, 4385 MeV, 4524 MeV, and 4632 MeV,
respectively; one state around the resonance mass 4327 MeV; and
two states around the resonance mass 4419 MeV and 4526 MeV,
respectively. All of them are compact tetraquarks. Among these states,
, and can be explained as the compact tetraquark
state with , and the is possible to be a candidate of
the compact tetraquark state with . More experimental tests are
expected to check the existence of all these possible resonance states.Comment: 10 pages, 3 figure
Love, Life, and “Leftover Ladies” in Urban China
The Chinese urban society in recent years has shown rising age at first marriage and declining marriage rates, especially among professional females with at least college degrees in their late 20s or their 30s. We exploit two nationally representative datasets over the period 2008-2012 and investigate the determinants of forming marriage for urban women aged 27 or above who are termed “leftover”. We estimate a recursive and dynamic mixed-equation model to describe women’s joint decisions on career, education and marriage. This considers various traits including demographic characteristics, wealth, work-related indicators, personality, attitudes and expectation, physical and facial attractiveness, leisure activities, personal and parental social status, local gender identity norms and marriage market conditions. We find “marital college-discount”: college education reduces the probability of marriage by 2.88%-3.6% and a postgraduate degree further oppresses it by 8.4%-10.4%. Counterfactual analysis indicates monotonicity, complementarity and substitution in multidimensional matching patterns. Patriarchy still appears to prevail
Meat consumption and all-cause mortality in 5763 patients with inflammatory bowel disease: A retrospective cohort study
Background: Whether meat consumption is related to risk of mortality in patients with inflammatory bowel disease (IBD) remains poorly understood. Methods: In the UK Biobank, 5763 patients with IBD were recruited from 2007 to 2010 and finished a brief food frequency questionnaire at baseline. We followed them until March 13, 2021 to document all-cause death events. Cox proportional hazard models were used to estimate hazard ratios (HRs) for all-cause mortality associated with consumptions of fish, unprocessed poultry, unprocessed red meat, and processed meat among the patients. Findings: During 67,095 person-years (mean follow-up 11·7 years, mean age 57·3, 52·5% female), we documented 590 death events. Higher consumption of processed meat was associated with an increased risk of all-cause mortality in patients with IBD (HR comparing >4·0 with 0-0·9 time/week=1·52, 95% confidence interval (CI) 1·05-2·19), but the P-trend for each 25 g increment was 0·075. This association remained significant in patients with Crohn's disease (HR 1·77, 95% CI 1·01-3·10) but not in patients with ulcerative colitis (HR 1·34, 95% CI 0·82-2·20). Consumptions of fish (HR 1·27, 95% CI 0·84-1·91), unprocessed poultry (HR 0·59, 95% CI 0·28-1·21), or unprocessed red meat (HR 0·87, 95% CI 0·60-1·26) were not significantly associated with the mortality of patients with IBD. Interpretation: More frequent consumption of processed meat was associated with an increased risk of mortality in patients with IBD, while no associations were observed for consumption of other types of meat. Our exploratory and speculative findings should be cautiously interpreted and need further replication in other cohorts. Funding: The National Natural Science Foundation of China (81,970,494); Key Project of Research and Development Plan of Hunan Province (2019SK2041)
Love, Life, and “Leftover Ladies” in Urban China
The Chinese urban society in recent years has shown rising age at first marriage and declining marriage rates, especially among professional females with at least college degrees in their late 20s or their 30s. We exploit two nationally representative datasets over the period 2008-2012 and investigate the determinants of forming marriage for urban women aged 27 or above who are termed “leftover”. We estimate a recursive and dynamic mixed-equation model to describe women’s joint decisions on career, education and marriage. This considers various traits including demographic characteristics, wealth, work-related indicators, personality, attitudes and expectation, physical and facial attractiveness, leisure activities, personal and parental social status, local gender identity norms and marriage market conditions. We find “marital college-discount”: college education reduces the probability of marriage by 2.88%-3.6% and a postgraduate degree further oppresses it by 8.4%-10.4%. Counterfactual analysis indicates monotonicity, complementarity and substitution in multidimensional matching patterns. Patriarchy still appears to prevail
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