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Geng Shiyang,Xie Hua,Chen Liping,Chen Dong,Lu Sijing,Zhao Nan,Yang Ruiming,Wang Zhao,He Shaoheng,Zhang Huiyun 대한천식알레르기학회 2022 Allergy, Asthma & Immunology Research Vol.14 No.6
Purpose: To explore expression of SP and NK1R in basophils of allergic asthma (AA), allergic rhinitis (AR) and AR combined with AA (ARA), and influence of allergens and immunoglobulin E (IgE) mediated mechanisms on SP and NK1R expression. Methods: Expression of SP and NK1R was detected by flow cytometry, NK1R mRNA expression was detected by real time quantitative polymerase chain reaction (qPCR), and mouse AR and AA models were employed for in vivo study. Results: SP+ and NK1R+ cells increased in CCR3+ and CD123+HLA-DR− granulocytes of AA. PPE elevated proportions of SP+ cells in CCR3+ and CD123+HLA-DR− granulocytes, whereas ASWE and HDME augmented SP+ cells in CD123+HLA-DR− granulocytes of AR and ARA patients. ASWE, HDME and PPE increased proportions of NK1R+ cells in CCR3+ PBMC and CD123+HLA-DR− granulocytes of AR patients. OVA, Der p1, IL-33, IL-37, IgE and SP enhanced NK1R expression on KU812 cells. NK1R expressing basophils were increased in blood of OVA sensitized and challenged AR and AA mice. FcεRI-KO AA mice seemed to have less NK1R+ basophils than WT AA mice in their blood. Conclusion: CCR3+ and CD123+HLA-DR− cells are likely involved in AA and AR via SP and NK1R. IgE-related mechanism may participate in upregulation of NK1R expression.
An Improved Active Damping Method with Capacitor Current Feedback
Geng, Yi-Wen,Qi, Ya-Wen,Liu, Hai-Wei,Guo, Fei,Zheng, Peng-Fei,Li, Yong-Gang,Dong, Wen-Ming The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2
Proportional capacitor current feedback active damping (CCFAD) has a limited valid damping region in the discrete time domain as (0, $f_s/6$. However, the resonance frequency ($f_r$) of an LCL-type filter is usually designed to be less than half the sampling frequency ($f_s$) with the symmetry regular sampling method. Therefore, ($f_s/6$, $f_s/2$) becomes an invalid damping region. This paper proposes an improved CCFAD method to extend the valid damping region from (0, $f_s/6$ to (0, $f_s/2$), which covers all of the possible resonance frequencies in the design procedure. The full-valid damping region is obtained and the stability margin of the system is analyzed in the discrete time domain with the Nyquist criterion. Results show that the system can operate stably with the proposed CCFAD method when the resonance frequency is in the region (0, $f_s/2$). The performances at the steady and dynamic state are enhanced by the selected feedback coefficient H and controller gain $K_p$. Finally, the feasibility and effectiveness of the proposed CCFAD method are verified by simulation and experimental results.
Low cycle fatigue and ratcheting failure behavior of AH32 steel under uniaxial cyclic loading
Dong, Qin,Yang, Ping,Xu, Geng The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.2
In this paper, the low cycle fatigue failure and ratcheting behavior, as well as their interaction of AH32 steel were experimentally investigated under uniaxial cyclic loading. The effects of mean stress, stress amplitude and stress ratio on the low cycle fatigue life and ratcheting strain were discussed. It was found that the ratcheting strain increased while the fatigue life decreased with the increase of mean stress and stress amplitude, and the increasing stress ratio would result in smaller ratcheting and larger fatigue life. Two kinds of failure modes, i.e. low cycle fatigue failure due to crack propagates and ratcheting failure due to large plastic strain will take place respectively. Based on the experimental results, considered the effect of ratcheting on fatigue life, a model with the maximum stress and ratcheting strain rate was proposed. Comparison with the experimental result showed that the new model provided a good prediction for AH32 steel.
Geng Hou,De-Guang Shang,Lin-Xuan Zuo,Lin-Feng Qu,Ming Xia,Yi-Er Guo,Xiang Yin,Shao-Dong Wu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
Fatigue test of a needled C/SiC composite with a notch under tension-tension cyclic loading was completed, and the main fatigue crack propagation curve of the needled composite was obtained by the in situ observation of the fatigue process. By analyzing the influence of the failure number and distribution on the tensile loading subjected by 0° fiber bundles, the relationship between the main fatigue crack propagation and the distribution of 0° fiber bundles in the needled composite was established. By observing the fracture microstructure (especially the distribution of 0° fiber bundles) of the needled composite through scanning electron microscopy, the reasons for the varying fatigue resistance of different notched specimens were also explained. In addition, acoustic emission (AE) was also used to analyze the AE energy characteristics during the fatigue crack propagation process of the needled composite.
Xu Geng,Qin Kai,Yan Renjun,Dong Qin 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1
This paper presents an experimental and numerical investigation on failure behavior and ultimate strength of fiber-reinforced sandwich composite structures. Tests were conducted on the sandwich Ljoints with Glass Fiber-Reinforced Polymer (GFRP) face sheet and Polyvinyl chloride (PVC) foam core. In the numerical simulation, a progressive damage method is established to simulate the strength and failure behavior of sandwich L-joint, different failure criteria are used to deal with the various failure modes of GFRP laminates. Cohesive zone model and viscoelastic material model are combined to model the face-core adhesive interface, hence the influence of fracture and debonding of adhesive to the total strength of sandwich joints is considered by the numerical modelling. On the base of these theories, the finite element model of sandwich L-joint has been successfully established, and the numerical predictions present a good agreement with the test results on both structural strength and failure process.
Di Geng,Dong Han Kang,Jin Jang IEEE 2011 IEEE electron device letters Vol.32 No.6
<P>We report the fabrication of amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors (TFTs) with a bottom-gate inverted-staggered structure with an etch stopper formed by a self-aligned process using back-side UV exposure. In addition to reduction in process complexity, the gate-to-source capacitance of an a-IGZO TFT is significantly reduced, resulting in fast TFT circuits. The fabricated TFT exhibits a field-effect mobility value of 42.59 cm<SUP>2</SUP>/V·s , a threshold voltage of 6.1 V, and a gate voltage swing of 374 mV/dec. An 11-stage ring oscillator made of TFTs shows a propagation delay time of 56 ns/stage at 25 V.</P>
High-Speed and Low-Voltage-Driven Shift Register With Self-Aligned Coplanar a-IGZO TFTs
Di Geng,Dong Han Kang,Man Ju Seok,Mativenga, M.,Jin Jang IEEE 2012 IEEE electron device letters Vol.33 No.7
<P>We report a high-speed and low-voltage-driven shift register utilizing self-aligned coplanar amorphous-indium-gallium-zinc-oxide thin-film transistors (a -IGZO TFTs). The a-IGZO TFTs exhibit field-effect mobility, threshold voltage, and gate-voltage swing of 24.7 cm<SUP>2</SUP>/V·s, 0.2 V, and 118 mV/dec, respectively. The rise and fall times of the shift register at the supply voltage (<I>V</I><SUB>DD</SUB>) of 1 V are 8 and 7 μs, respectively, and the output pulse is free from distortion or ripple. For a <I>V</I><SUB>DD</SUB> of 15 V, the clock frequency of the shift register approaches 500 kHz, making it applicable to high-resolution active-matrix displays.</P>
Meng, Dongli,Yang, Shaojun,Guo, Liang,Li, Guoxing,Ge, Jiechao,Huang, Yong,Bielawski, Christopher W.,Geng, Jianxin The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.92
<P>Composites prepared by grafting poly(3-hexylthiophene) (P3HT) onto the surfaces of reduced graphene oxide (RGO) (RGO-<I>g</I>-P3HT) exhibit an enhanced photothermal effect due to photoinduced energy transfer from P3HT to RGO. A remote photo-controlled electrical switch was prepared using RGO-<I>g</I>-P3HT as a photothermal layer.</P> <P>Graphic Abstract</P><P>Photoinduced energy transfer from a conjugated system to graphene sheets enables the enhanced photothermal effect of graphene-based composites. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc06849a'> </P>