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Dynamic Modeling and Parameter Identification of Magnetorheological Shock Absorber
Yang Yonggang,Yu Peng,Zhu Shixing,Kong Xiangfen 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.9
By dynamic analysis, the dynamic modeling of designed magnetorheological(MR) shock absorber with metering pin is established, and using the experimental data. The relation of kinematic viscosity and current, and shear stress and current are respectively identified, and the parameters of dynamic model are identified by the least square identification method. The experiment results show that the identified model has high accuracy, and can be used for the performance analysis and control system design of the shock absorber.
Controlled synthesis and characterization of BiVO4 dendrites via a hydrothermal method
Yonggang Wang,Linlin Yang,Xiaofeng Wang,Yujiang Wang,GAORONG HAN 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.7
BiVO4 dendrites have been controllably synthesized by a hydrothermal method without any surfactants or templates. Thestructure and morphology of the obtained BiVO4 dendrites were characterized by X-ray powder diffraction, scanning electronmicroscope, transmission electron microscopy, and high-resolution transmission electron microscopy. The effect of the pHvalues, precursors, solution concentrations, reaction temperature, and reaction time on the morphology and structure of theBiVO4 dendrites was systematically studied for the first time. It is found that the morphologies of the obtained BiVO4crystallites can vary from cubic-like to dendritic shape. The BiVO4 dendrites can be successfully fabricated by thehydrothermal method at 150 oC and pH 7 when Bi2(CO3)3 and NH4VO3 were used as precursors The resultant dendriticstructure has four trunks which have ordered branches on the opposite sides of the trunks. A rational mechanism for theoriental growth of the BiVO4 dendrites is discussed. The preparation of BiVO4 dendrites with well-dened shapes may open newopportunities for wide applications of future nanodevices.
Controlled synthesis of SrCO3 dendrites by a simple hydrothermal method
Yonggang Wang,Linlin Yang,Xiaofeng Wang,Yujiang Wang,GAORONG HAN 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.2
In this paper, we report the controlled synthesis of SrCO3 crystals by a simple hydrothermal method without any surfactants and templates. The as-prepared samples were characterized by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The effect of pH value, temperature, and reaction time on the formation of SrCO3 crystals was investigated. This novel route is proved to be simple and environment-friendly, which can be extended to the shape-controlled synthesis of other metal oxide nanocrystals.
Yang, Jianqing,Zhang, Quanhu,Su, Xianghua,Li, Sufen,Zhuang, Lin,Hou, Suxia,Huo, Yonggang,Zhou, Hao,Liu, Guorong Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.5
Fast-Neutron Multiplicity Counter based on Liquid Scintillator Detector can directly measure the fast neutron multiplicity emitted by UO<sub>2</sub> rod. HPGe gamma spectrometer; which has superior energy resolution; is routinely used for the gamma energy spectrum measurement. Combing Fast-Neutron Multiplicity Counter and HPGe γ-spectrometer, the n/γ joint measurement system is developed. The fast neutron multiplicity and gamma energy spectrum of UO<sub>2</sub> rod assemblies under different conditions are measured by the n/γ joint measurement system. The induced fission rate and the <sup>235</sup>U abundance, thereby the <sup>235</sup>U mass; can be obtained for UO<sub>2</sub> rod assemblies. The <sup>235</sup>U mass deviation of the measured value from the reference value is less than 5%. The results show that the n/γ joint measurement system is effective and applicable in the measurement of the <sup>235</sup>U mass in samples.
Qiu Yang,Yuan Yonggang,Luo Ping 한국유전학회 2022 Genes & Genomics Vol.44 No.2
Background: MiRNAs belong to non-coding RNAs that are involved in cancer development. Acting as a mediator, they could regulate the expression level of numerous gens. However, the expression and function of miR-1299 in gastric cancer (GC) are not clear. Objective: To explore the role of miR-1299 in the process of GC. Methods: We detected the levels of miR-1299 in clinical samples of GC and investigated the role of miR-1299 in the regulation of the GC cells proliferation, apoptosis and metastasis. Luciferase reporter assay was employed to verify the target of miR-1299. Additionally, the proliferation, apoptosis and metastasis of AGS and SGC7901 cells were analyzed after the overexpression of miR-1299. Results: Our study showed the expression of miR-1299 was decreased in GC tissues and cell lines. It indicated that the cell proliferation, migration and invasion was inhibited, while the cell apoptosis was promoted by the over-expressed miR-1299. Also, we found that miR-1299 could directly target the 3'-untranslated region (3'UTR) of ARF6 genes. In addition, rescue assay demonstrated that miR-1299 overexpression promoted the cell apoptosis and inhibited cell growth, which could be attenuated by the overexpression of ARF6. Conclusions: These findings indicate that miR-1299 regulates cell progression in GC by targeting ARF6 genes, and suggest that miR-1299 may be a tumor suppressor in the GC progression.
Ge Yang,Genda Gu,Aleksey E. Bolotnikov,Yonggang Cui,Giuseppe S. Camarda,Anwar Hossain,Utpal N. Roy,Nicholas Kivi,Tiansheng Liu,Ralph B. James 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.3
Cadmium manganese telluride (CdMnTe or CMT), a compound semiconductor, is considered a promising material for the fabrication of high-performance room-temperature x-ray and gamma-ray detectors. The presence of material defects, e.g., high density of Te inclusions, has been a long-standing issue in CMT crystals grown by various Bridgman methods, since these defects degrade the device performance via charge-trapping. To address this issue, we employed the modified floating-zone method (MFZ) to grow CMT crystals and obtained as-grown crystals free of Te inclusions. This represents a new and distinct feature, absence of Te inclusions, compared to CMT crystals grown by Bridgman methods. White-beam x-ray diffraction topography (WBXDT) measurements demonstrated the existence of a high stress field within the MFZ-grown CMT crystals, which originates from the steep temperature gradient near the growth interface. Furthermore, we achieved a resistivity of 109 Ωcm for the MFZ-grown CMT crystals. The low-temperature photoluminescence (PL) measurements show that the intensity of the dislocation-related Y band is much higher than that of the principal exciton peaks, (D0,X) and (A0,X), confirming that the crystalline quality is affected by the high stress field. A long-term in-situ or post-growth thermal annealing will help to release such stress to improve the crystalline quality.
An Efficient Method for Electron-Atom Scattering Using Ab-initio Calculations
Yuan Xu,Yonggang Yang,Liantuan Xiao,Suotang Jia 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.4
We present an efficient method based on ab-initio calculations to investigate electron-atom scatterings. Those calculations profit from methods implemented in standard quantum chemistry programs. The new approach is applied to electron-helium scattering. The results are compared with experimental and other theoretical references to demonstrate the efficiency of our method.
Hou, Linjun,Huo, Yonggang,Zuo, Wenming,Yao, Qingxu,Yang, Jianqing,Zhang, Quanhu Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1
Cosmic-ray muon scattering tomography (MST) technology is a new radiation imaging technology with unique advantages. As the performance of its image reconstruction algorithm has a crucial influence on the imaging quality, researches on this algorithm are of great significance to the development and application of this technology. In this paper, a fast inspection algorithm based on clustering analysis for the identification of the existence of nuclear materials is studied and optimized. Firstly, the principles of MST technology and a binned clustering algorithm were introduced, and then several simulation experiments were carried out using Geant4 toolkit to test the effects of exposure time, algorithm parameter, the size and structure of object on the performance of the algorithm. Based on these, we proposed two optimization methods for the clustering algorithm: the optimization of vertical distance coefficient and the displacement of sub-volumes. Finally, several sets of experiments were designed to validate the optimization effect, and the results showed that these two optimization methods could significantly enhance the distinguishing ability of the algorithm for different materials, help to obtain more details in practical applications, and was therefore of great importance to the development and application of the MST technology.
Hou, Linjun,Zhang, Quanhu,Yang, Jianqing,Cai, Xingfu,Yao, Qingxu,Huo, Yonggang,Chen, Qifan Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.7
As a relatively new radiation imaging method, the cosmic-ray muon scattering imaging technology can be used to prevent nuclear smuggling and is of considerable significance to nuclear safety. Proposed in this paper is a new reconstruction algorithm based on density clustering, aiming to improve inspection quality with better performance. Firstly, this new algorithm is introduced in detail. Then in order to eliminate the inequity of the density threshold caused by the heterogeneity of the muon flux in different positions, a new flux correction method is proposed. Finally, three groups of simulation experiments are carried out with the help of Geant4 toolkit to optimize the algorithm parameters, verify the correction method and test the inspection quality under shielded condition, and compare this algorithm with another common inspection algorithm under different conditions. The results show that this algorithm can effectively identify and locate nuclear material with low misjudging and missing rates even when there is shielding and momentum precision is low, and the threshold correcting method is universally effective for density clustering algorithms.