263 research outputs found
The Innovation and Practice of Synergistic Cultivation Model of Integrating the Spirit of Volunteer Teaching in Western China into the Moral Education of College English
Volunteer teaching in western China is an important initiative to serve the development of the western region of the country and contribute to the talent and science education of the west region. As a distinctive culture of Baoding University, volunteer teaching in western China is rich in educational values. Based on College English course, this paper mainly discusses the current dilemmas of the moral education of this course, puts forward synergistic cultivation strategies of integrating the spirit of volunteer teaching in western China into the moral education of College English, and presents some preliminary achievements of the synergistic cultivation model. It is expected that this research will promote the combination of college English teaching and patriotic education, realize the fundamental task of fostering virtue through education, and increase the output of volunteer teaching talents
Distinct fingerprints of charge density waves and electronic standing waves in ZrTe
Experimental signatures of charge density waves (CDW) in high-temperature
superconductors have evoked much recent interest, yet an alternative
interpretation has been theoretically raised based on electronic standing waves
resulting from quasiparticles scattering off impurities or defects, also known
as Friedel oscillations (FO). Indeed the two phenomena are similar and related,
posing a challenge to their experimental differentiation. Here we report a
resonant X-ray diffraction study of ZrTe, a model CDW material. Near the
CDW transition, we observe two independent diffraction signatures that arise
concomitantly, only to become clearly separated in momentum while developing
very different correlation lengths in the well-ordered state. Anomalously slow
dynamics of mesoscopic ordered nanoregions are further found near the
transition temperature, in spite of the expected strong thermal fluctuations.
These observations reveal that a spatially-modulated CDW phase emerges out of a
uniform electronic fluid via a process that is promoted by self-amplifying FO,
and identify a viable experimental route to distinguish CDW and FO.Comment: 6 pages, 4 figures; supplementary information available upon reques
Adipose-derived mesenchymal stem cells attenuate ischemic brain injuries in rats by modulating miR-21-3p/MAT2B signaling transduction
Aim To explore the mechanism underlying the protective
effect of adipose-derived mesenchymal stem cells (ADMSCs)
against ischemic stroke by focusing on miR-21-3p/
MAT2B axis.
Methods Ischemic brain injury was induced in 126 rats
by middle cerebral artery occlusion (MCAO). The effect of
ADMSC administration on blood-brain barrier (BBB) condition,
apoptosis, inflammation, and the activity of miR-21-
3p/MAT2B axis was assessed. The role of miR-21-3p inhibition
in the function of ADMSCs was further validated in in
vitro neural cells.
Results ADMSCs administration improved BBB condition,
inhibited apoptosis, and suppressed inflammation. It also
reduced the abnormally high level of miR-21-3p in MCAO
rats. Dual luciferase assays showed that miR-21-3p directly
inhibited the MAT2B expression in neural cells, and miR-21
-3p inhibition by inhibitor or ADMSC-derived exosomes in
neurons attenuated hypoxia/reoxygenation-induced impairments
similarly to that of ADMSCs in vivo.
Conclusion This study confirmed the protective effect
of ADMSCs against ischemic brain injury exerted by suppressing
miR-21-3p level and up-regulating MAT2B level
H2RBox-v2: Boosting HBox-supervised Oriented Object Detection via Symmetric Learning
With the increasing demand for oriented object detection e.g. in autonomous
driving and remote sensing, the oriented annotation has become a
labor-intensive work. To make full use of existing horizontally annotated
datasets and reduce the annotation cost, a weakly-supervised detector H2RBox
for learning the rotated box (RBox) from the horizontal box (HBox) has been
proposed and received great attention. This paper presents a new version,
H2RBox-v2, to further bridge the gap between HBox-supervised and
RBox-supervised oriented object detection. While exploiting axisymmetry via
flipping and rotating consistencies is available through our theoretical
analysis, H2RBox-v2, using a weakly-supervised branch similar to H2RBox, is
embedded with a novel self-supervised branch that learns orientations from the
symmetry inherent in the image of objects. Complemented by modules to cope with
peripheral issues, e.g. angular periodicity, a stable and effective solution is
achieved. To our knowledge, H2RBox-v2 is the first symmetry-supervised paradigm
for oriented object detection. Compared to H2RBox, our method is less
susceptible to low annotation quality and insufficient training data, which in
such cases is expected to give a competitive performance much closer to
fully-supervised oriented object detectors. Specifically, the performance
comparison between H2RBox-v2 and Rotated FCOS on DOTA-v1.0/1.5/2.0 is
72.31%/64.76%/50.33% vs. 72.44%/64.53%/51.77%, 89.66% vs. 88.99% on HRSC, and
42.27% vs. 41.25% on FAIR1M.Comment: 13 pages, 4 figures, 7 tables, the source code is available at
https://github.com/open-mmlab/mmrotat
The fast light of CsI(Na) crystals
The responds of different common alkali halide crystals to alpha-rays and
gamma-rays are tested in our research. It is found that only CsI(Na) crystals
have significantly different waveforms between alpha and gamma scintillations,
while others have not this phenomena. It is suggested that the fast light of
CsI(Na) crystals arises from the recombination of free electrons with
self-trapped holes of the host crystal CsI. Self-absorption limits the emission
of fast light of CsI(Tl) and NaI(Tl) crystals.Comment: 5 pages, 11 figures Submit to Chinese Physics
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