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Defect-induced Visible-light Emission in GaN Nanocrystals Synthesized through a Solution-based Route
Yinsheng He,Zhixin Wan,신기삼,Jiling Dong,Youngmoom Yu 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.9
In this study, nanocrystalline GaN was synthesized through a metathesis reaction at room temperature. The microstructure of the GaN examined by X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed the single nature with würtzite structure. High resolution TEM (HRTEM) images showed that the defects were formed in the as-prepared GaN nanocrystals. Room temperature photoluminescence (PL) spectra showed the near band-edge emission at 356 nm (3.48 eV) as well as visible light emission at 420 ~ 460 nm (2.70 ~ 2.95 eV). The increase in the intensity of visible light peak was observed by annealing the as-prepared specimen at 850 ℃ for 3 hrs, which was due to the increase in the numeric density of defects caused by de-passivation of impurity during annealing. Therefore, it can be concluded that the visible light emission in the GaN nanocrystals was induced by the defects (possibly N vacancies) in the structure.
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Role of IFNLR1 gene in PRRSV infection of PAM cells
Ming Qin,Wei Chen,Zhixin Lin,Lixue Wang,Lixia Ma,Jinhong Geng,Yu Zhang,Jing Zhao,Yong-Qing Zeng 대한수의학회 2021 Journal of Veterinary Science Vol.22 No.3
Background: Interferon lambda receptor 1 (IFNLR1) is a type II cytokine receptor that clings to interleukins IL-28A, IL29B, and IL-29 referred to as type III IFNs (IFN-λs). IFN-λs act through the JAK-STAT signaling pathway to exert antiviral effects related to preventing and curing an infection. Although the immune function of IFN-λs in virus invasion has been described, the molecular mechanism of IFNLR1 in that process is unclear. Objectives: The purpose of this study was to elucidate the role of IFNLR1 in the pathogenesis and treatment of porcine reproductive and respiratory syndrome virus (PRRSV). Methods: The effects of IFNLR1 on the proliferation of porcine alveolar macrophages (PAMs) during PRRSV infection were investigated using interference and overexpression methods. Results: In this study, the expressions of the IFNLR1 gene in the liver, large intestine, small intestine, kidney, and lung tissues of Dapulian pigs were significantly higher than those in Landrace pigs. It was determined that porcine IFNLR1 overexpression suppresses PRRSV replication. The qRT-PCR results revealed that overexpression of IFNLR1 upregulated antiviral and IFN-stimulated genes. IFNLR1 overexpression inhibits the proliferation of PAMs and upregulation of p-STAT1. By contrast, knockdown of IFNLR1 expression promotes PAMs proliferation. The G0/G1 phase proportion in IFNLR1-overexpressing cells increased, and the opposite change was observed in IFNLR1-underexpressing cells. After inhibition of the JAK/STAT signaling pathway, the G2/M phase proportion in the IFNLR1-overexpressing cells showed a significant increasing trend. In conclusion, overexpression of IFNLR1 induces activation of the JAK/STAT pathway, thereby inhibiting the proliferation of PAMs infected with PRRSV. Conclusion: Expression of the IFNLR1 gene has an important regulatory role in PRRSV-infected PAMs, indicating it has potential as a molecular target in developing a new strategy for the treatment of PRRSV.
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VEHICLE YAW STABILITY CONTROL AT THE HANDLING LIMITS BASED ON MODEL PREDICTIVE CONTROL
Shaosong Li,Guodong Wang,Bangcheng Zhang,Zhixin Yu,Gaojian Cui 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.2
This study proposes a double linear model predictive control (DLMPC) structure to improve the tyre force utilization of active front steering (AFS) vehicle at the handing limits. The DLMPC structure consists of a linear model predictive control (LMPC) and a linear time-varying model predictive control (LTV-MPC). During normal driving conditions, the AFS adopts LMPC to control the vehicle. When vehicle running at the handing limits, the tyre force is near saturation, LTV-MPC is activated to prevent tyre force from entering unstable region. The proposed DLMPC controller can reflect the nonlinear dynamic characteristic of tyres by the expression design of tyre force. Double lane change and sine with dwell maneuver tests are provided to demonstrate the effectiveness and feasibility of the DLMPC controller. Results corroborate that the proposed DLMPC controller can fully exploit the potential of AFS and maintain the yaw stability of the vehicle at the handling limits.
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RETURN CONTROL OF ELECTRONIC POWER STEERING UNEQUIPPED WITH AN ANGLE SEN
Shaosong Li,Luping Guo,Gaojian Cui,Zhixin Yu,Xiaohui Lu,Guodong Wang 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.2
A steering wheel may not be able to return to the center position due to friction torque in its mechanism. Thus, in this study, a return controller is developed to improve the returnability of an electric power steering vehicle without an angle sensor. The aligning moment is well estimated on the basis of a Kalman filter estimator. A trigger rule is also proposed to switch between assist and return controls. Finally, the compensation current for the return control is regulated in accordance with the aligning moment and vehicle speeds. Simulation and real vehicle results show that the proposed control system can significantly improve the returnability of the steering system.
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