11,604 research outputs found
Spinor Walls in Five-Dimensional Warped Spacetime
We study domain wall solutions of a real spinor field coupling with
gravitation in five dimensions. We find that the nonlinear spinor field
supports a class of soliton configurations which could be viewed as a wall
embedded in five dimensions. We begin with an illuminating solution of the
spinor field in the absence of gravitation. In a further investigation, we
exhibit three sets of solutions of the spinor field with nonconstant curvature
bulk spacetimes and three sets of solutions corresponding to three constant
curvature bulk spacetimes. We demonstrate that some of these solutions in
specific conditions have the energy density distributions of domain walls for
the spinor field, where the scalar curvature is regular everywhere. Therefore,
the configurations of these walls can be interpreted as spinor walls which are
interesting spinor field realizations of domain walls. In order to investigate
the stability of these spinor configurations, the linear perturbations are
considered. The localization of the zero mode of tensor perturbation is also
discussed.Comment: 31 pages,5 figure
A Span-Extraction Dataset for Chinese Machine Reading Comprehension
Machine Reading Comprehension (MRC) has become enormously popular recently
and has attracted a lot of attention. However, the existing reading
comprehension datasets are mostly in English. In this paper, we introduce a
Span-Extraction dataset for Chinese machine reading comprehension to add
language diversities in this area. The dataset is composed by near 20,000 real
questions annotated on Wikipedia paragraphs by human experts. We also annotated
a challenge set which contains the questions that need comprehensive
understanding and multi-sentence inference throughout the context. We present
several baseline systems as well as anonymous submissions for demonstrating the
difficulties in this dataset. With the release of the dataset, we hosted the
Second Evaluation Workshop on Chinese Machine Reading Comprehension (CMRC
2018). We hope the release of the dataset could further accelerate the Chinese
machine reading comprehension research. Resources are available:
https://github.com/ymcui/cmrc2018Comment: 6 pages, accepted as a conference paper at EMNLP-IJCNLP 2019 (short
paper
Was the Ediacaran Shuram Excursion a globally synchronized early diagenetic event? Insights from methane-derived authigenic carbonates in the uppermost Doushantuo Formation, South China
The Ediacaran Period is characterized by the most profound negative carbon isotope (
Effects of flavonoids extracted from the whole plant of Patrinia Villosa (Thunb) Juss in a rat model of chronic pelvic inflammation
Purpose: To investigate the effects of total flavonoids (PLV) extracted from the whole plant of Patrinia Villosa (Thunb.) Juss (PTJ) in a rat model of chronic pelvic inflammation.Methods: An orthogonal test design was employed to optimize the extraction conditions of PLV via reflux extraction by ethanol. Rats were randomly divided into control group, model group and PLV groups. An absorbable gelatin sponge with pathogens was inserted into the cervix of the rat to establish a pelvic inflammatory model. The PLV groups were orally administered PLV at doses of 25, 50 and 100 mg/kg for eight days. Enzyme-linked immunosorbent assay (ELISA) was used for the determination of inflammatory cytokines in rat serum and the culture supernatant of RAW264.7 cells. Real-time reverse transcription polymerase chain reaction (real-time PCR) was employed to determine mRNA levels.Results: The optimum extraction conditions for PLV by orthogonal test were obtained: extraction time (120 min), ratio of liquid to raw material (20 mL/g) and ethanol concentration (50 %). By treating with PLV, the levels of TNF-α, IL-6 and IL-1β significantly decreased (p < 0.01), while IL-10 level significantly increased (p < 0.01) in the serum of chronic pelvic inflammatory rats and LPS-stimulated macrophages. In addition, a similar trend was observed in the mRNA levels of LPS-stimulated macrophages treated with PLV.Conclusion: PLV showes significant anti-inflammatory effects on chronic pelvic inflammation. The potential mechanism is related to regulating the expression of inflammatory factorsKeywords: Patrinia Villosa (Thunb.) Juss, Total flavonoids, Chronic pelvic inflammation, Inflammatory cytokine
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