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Your search keyword '"Feng, Yu-Kun"' showing total 19 results
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19 results on '"Feng, Yu-Kun"'

1. Electric quadrupole shifts of the precession frequencies of $^{131}$Xe atoms in rectangular cells

Author

Feng, Yu-Kun, Zhang, Shao-Bo, Lu, Zheng-Tian, and Sheng, Dong

Subjects
Physics - Atomic Physics
Abstract

We study an atomic comagnetometer design based on the spin precessions of $^{129}$Xe and $^{131}$Xe atoms in glass cells. The quadrupole splittings in the precession spectrum of $^{131}$Xe are fully resolved, allowing a precise determination of the magnetic-dipole precession frequency. The transverse asymmetry of quadrupole interactions, due to both the geometry and surface properties of the cell, characterized by a non-zero asymmetry parameter $\eta$, modifies the dependence of the quadrupole splittings on the relative orientation between the cell axes and the bias magnetic field, and lead to additional corrections in the precession frequencies of $^{131}$Xe atoms. We examine these effects both theoretically and experimentally, and develop methods to quantify and control such shifts., Comment: Accepted by Phys. Rev. A

Published
2020
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4. Coupling Effect of Disconnected Pores and Grain Morphology on the Corrosion Tolerance of Laser-Clad 316L Coating.

Author

Zhang, San-Qi, Dong, Hui, Han, Yan, Xu, Long, Feng, Yu-Kun, and Li, Peng-Yu

Subjects
CORROSION resistance, CORROSION potential, GRAIN, SCANNING electron microscopy, MORPHOLOGY, X-ray diffraction
Abstract

The corrosion resistance of 316L cladding layers was addressed via the electrochemical test, to illustrate the coupling effect of the disconnected pores and grain morphology on the corrosion tolerance of 316L cladding layers. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrochemical testing were employed to characterize the microstructure, elemental distribution, phase composition, and corrosion resistance of the cladding layers. The results indicate that the disconnected porosity in the surface of the cladding layer decreased from 0.79% to 0.48% and the grain morphology underwent a transformation from equiaxed crystals to columnar and lath crystals, with the increasing scanning speed. The primary phase in the cladding layer was γ-Fe. Under the dual effect of a low disconnected porosity and grain morphology, the corrosion potential of the cladding layer became more electropositive from −568 mVSCE to −307 mVSCE, and the corrosion current density reduced from 4.664 μA∙cm−2 to 1.645 μA∙cm−2. The pitting potential improved from 0.005 VSCE to 0.575 VSCE as the scanning speed increased. Thus, the non-connected pores in the 316L cladding layer also affected the corrosion resistance, especially the pitting resistance. The corrosion resistance of the cladding layer can be significantly enhanced via the control of the disconnected pores and grain morphology. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Additional file 1 of Oral P. gingivalis impairs gut permeability and mediates immune responses associated with neurodegeneration in LRRK2 R1441G mice

Author

Feng, Yu-Kun, Qiong-Li Wu, Peng, Yan-Wen, Feng-Yin Liang, Hua-Jing You, Feng, Yi-Wei, Li, Ge, Li, Xue-Jiao, Liu, Shu-Hua, Li, Yong-Chao, Zhang, Yu, and Pei, Zhong

Abstract

Additional file 1: Figure S1. (a) Representative images of immunofluorescence-stained coronal brain sections and quantification of TH number (a marker of dopaminergic neuron ) from WT-OX + Pg compared to WT-OX + C mice. n = 4–5. (Scale bar = 200 μm.) A Student’ t test was used for analysis. (b) Representative images of immunofluorescence double staining with dendric marker MAP2 and comparison of dendric density from WT-OX + Pg compared to WT-OX + C mice. n = 4–5. (Scale bar =100 μm.) A Student’ t test was used for analysis. (c) Latency to fall in the rotarod test (left panel) and locomotor activity distance moved in the open field test (right panel) from F + C, F + Pg, 1441 + Pg, and 1441 + C mice, n = 8. Two-way ANOVA and Tukey’s test were used for analysis.

Published
2020
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9. Additional file 4 of Oral P. gingivalis impairs gut permeability and mediates immune responses associated with neurodegeneration in LRRK2 R1441G mice

Author

Feng, Yu-Kun, Qiong-Li Wu, Peng, Yan-Wen, Feng-Yin Liang, Hua-Jing You, Feng, Yi-Wei, Li, Ge, Li, Xue-Jiao, Liu, Shu-Hua, Li, Yong-Chao, Zhang, Yu, and Pei, Zhong

Abstract

Additional file 4: Figure S4. (a) Representative images of histopathology of the colon and small intestine obtained from F + C, F + Pg, 1441 + Pg, and 1441 + C mice. (Scale bar = 100 μm.)

Published
2020
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10. Additional file 3 of Oral P. gingivalis impairs gut permeability and mediates immune responses associated with neurodegeneration in LRRK2 R1441G mice

Author

Feng, Yu-Kun, Qiong-Li Wu, Peng, Yan-Wen, Feng-Yin Liang, Hua-Jing You, Feng, Yi-Wei, Li, Ge, Li, Xue-Jiao, Liu, Shu-Hua, Li, Yong-Chao, Zhang, Yu, and Pei, Zhong

Abstract

Additional file 3: Figure S3. INF-γ and IL-1α protein levels in serum (a, b) were examined using multiplex cytokines and chemokines analysis from F + C, F + Pg, 1441 + C, and 1441 + Pg, n = 4–5. Two-way ANOVA and Tukey’s test were used for analysis. (c) Representative images of western blots of IL-17A obtained from SN tissue and quantitative analysis, n = 4. Two-way ANOVA and Tukey’s test were used for analysis. (d) Representative images of co-localization of Iba1 (red) and IL-17RA (green) in the SN from Pg-treated R1441G mice. (Scale bar = 20 μm). (e) Representative images of co-localization of CD3 (red) and Th (green) in the SN from Pg-treated R1441G mice. (Scale bar = 100 μm).

Published
2020
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11. Additional file 1 of Mesenchymal stem cell-derived exosomes improve motor function and attenuate neuropathology in a mouse model of Machado-Joseph disease

Author

Hua-Jing You, Fang, Shu-Bin, Teng-Teng Wu, Hongyu Zhang, Feng, Yu-Kun, Li, Xue-Jiao, Yang, Hui-Hua, Li, Ge, Xun-Hua Li, Wu, Chao, Fu, Qing-Ling, and Pei, Zhong

Abstract

Additional file 1: Figure S1. Characterization of human induced pluripotent stem cell-derived mesenchymal stem cells. (a) Morphology of iPSC-MSCs (original magnification, 100×). (b) The MSC surface markers in iPSC-MSCs by flow cytometry. Cells were harvested at passage 9.

Published
2020
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12. Additional file 2 of Oral P. gingivalis impairs gut permeability and mediates immune responses associated with neurodegeneration in LRRK2 R1441G mice

Author

Feng, Yu-Kun, Qiong-Li Wu, Peng, Yan-Wen, Feng-Yin Liang, Hua-Jing You, Feng, Yi-Wei, Li, Ge, Li, Xue-Jiao, Liu, Shu-Hua, Li, Yong-Chao, Zhang, Yu, and Pei, Zhong

Abstract

Additional file 2: Figure S2. (a) Representative images of immunofluorescence staining with Iba1 (a marker of microglia) and comparison of Iba1 density in the SN area from WT-OX + Pg compared to WT-OX + C mice. n = 4-5. (Scale bar = 100 μm). A Student’ t test was used for analysis. (b) Representative images of co-localization of CCR2 (red) and Th (green) in the SN from Pg-treated R1441G mice. (Scale bar = 100 μm). (c) Representative images of western blots of LRRK2 (left panel) and LRRK935 protein levels (right panel), which were done with the SN obtained from WT-OX + Pg and WT-OX + C mice.

Published
2020
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13. Chronic oral administration of P. gingivalis induces microglial activation and degeneration of dopaminergic neurons possibly through increase in gut permeability and peripheral IL-17A in LRRK2 R1441G mice

Author

Feng, Yu-kun, primary, Peng, Yan-Wen, additional, Wu, Qiong-Li, additional, Liang, Feng-Yin, additional, You, Hua-Jing, additional, Feng, Yi-Wei, additional, Li, Ge, additional, Li, Xue-jiao, additional, Liu, Shu-Hua, additional, Li, Yong-Chao, additional, Zhang, Yu, additional, and Pei, Zhong, additional

Published
2020
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19. [Study on correlation between histocompatibility leukocyte antigen class II gene and gestational diabetes mellitus].

Author

Zhao ML, Feng YK, and Qi WJ

Subjects
Adult, Alleles, Female, Gene Frequency, HLA-DQ Antigens genetics, Humans, Odds Ratio, Polymerase Chain Reaction methods, Pregnancy, Pregnancy Trimester, Third, Diabetes, Gestational genetics, Genetic Predisposition to Disease, HLA-D Antigens genetics
Abstract

Objective: To investigate correlation between part of histocompatibility leukocyte antigen (HLA) class II gene and gestational diabetes mellitus (GDM)., Methods: Part of HLA-II gene was examined by polymerase chain reaction sequence specific primer (PCR-SSP). Forty-eight GDM women were served as study group, and forty-eight normal pregnant women were selected as control group., Results: The frequencies of DRB1*0301, DRB1*1302 and DQA1*0301 of GDM (18.8%, 45.8% and 64.6%) in study group were significantly increased compared with control group (4.2%, 18.8% and 41.7%) (P < 0.05)., Conclusions: The results suggest that there is correlation between HLA class II gene and gestational diabetes mellitus. DRB1*0301, DRB1*1302 and DQA1*0301 are the susceptible alleles of GDM.

Published
2005

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