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Qidong Geng,Wei Wang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
7075-T651 aluminum alloy, which is is widely used in aircraft structural parts, exhibits high-strength deformation. This study proposes using ultrasonic impact enhancement technology to improve the fatigue resistance of this alloy and extend its service life. The principle of ultrasonic impact enhancement is based on equivalent impedance control. The surface-strengthening effect is verified via experiments. Results revealed that the surface roughness of the workpiece decreases from an original value of 0.713 μm to as low as 0.353 μm. The microhardness of the surface increases from 201 to 260 HV 0.1 . The residual stress of the surface also increases from −25 to −312 MPa. Under the constant impedance threshold, the surface roughness of the workpiece decreases and the surface microhardness as well as residual stress increase with increasing current output. Under the constant output current, the surface roughness of the workpiece decreases to its minimum value, the microhardness gradually increases, and the residual stress reaches its maximum value with increasing impedance threshold.
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Research on damage of 3D random aggregate concrete model under ultrasonic dynamic loading
Lixiao Wang,Qidong Chen,Xin Liu,Bin Zhang,Yichen Shen 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.26 No.1
Concrete are the most widely used manmade materials for infrastructure construction across the world. These constructions gradually aged and damaged due to long-term use. However, there does not exist an efficient concrete recycling method with low energy consumption. In this study, concrete was regarded as a heterogeneous material composed of coarse aggregate and cement mortar. And the failure mode of concrete under ultrasonic dynamic loading was investigated by finite element (FE) analysis. Simultaneously, a 3D random aggregate concrete model was programmed by APDL and imported into ABAQUS software, and the damage plastic constitutive model was applied to each phase to study the damage law of concrete under dynamic loading. Meanwhile, the dynamic damage process of concrete was numerically simulated, which observed ultrasonic propagating and the concrete crushing behavior. Finally, the FE simulation considering the influence of different aggregate volume and aggregate size was carried out to illustrate the damage level of concrete.
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朱其东(Qidong Zhu),王连浩(Lianhao Wang) YIXIN 출판사 2024 Journal of China Studies Vol.2 No.1
制度理论的多维建构,是当前思想政治教育研究的重要内容和主要论域。然而现有学科理论的建构还存有理论规范性、认同性、整合性等亟需解决的问题。因而,需要进一步提升制度思维和逻辑能力,强化问题意识和实践意识,实现制度研究方法论的创新,以此加快思想政治教育制度理论的学科构建。 The multidimensional construction of institutional theory is an important content and main field of research in current ideological and political education. However, there are still urgent issues to be addressed in the construction of existing disciplinary theories, such as theoretical standardization, identity, and integration. Therefore, it is necessary to further enhance institutional thinking and logical abilities, strengthen problem awareness and practical awareness, and achieve innovation in institutional research methodology, in order to accelerate the disciplinary construction of ideological and political education system.
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Jin Yong,Wang Zhilin,Zhang Zhenxin,Lin Bo,Ge Zhengjun,You Qidong,Chen Hao,Liu Xiliang,Xu Chenghao,Gao Shuaiqiang,Wu Yi,Abro Zafar 한국자원공학회 2023 Geosystem engineering Vol.26 No.4
CO2 flooding is a significant technology for oil recovery, to reveal the microcosmic mechanism of CO2 flooding, CO2 slim tube experiments, long core CO2 flooding experiments, gas chromatography analysis experiments, and numerical simulations were carried out. The results show that the miscibility increase can improve the effect of dissolution and diffusion in the CO2-crude oil system, easing the CO2 finger entry phenomena, and delaying gas breakthrough time. Besides, the CO2 -crude oil interaction is enhanced by increasing the pressure difference between the injection well and the production well, which improves the oil recovery of CO2 flooding. Besides, CO2 carries the light and medium components (C4 ~ 25) forward to cross the first miscible zone, which makes the CO2-crude oil system form double miscible zones. This study reveals the rule of CO2 front and light components front under different miscibility degrees of CO2 flooding from the microscopic perspective and deepens the theory of CO2 flooding in low-permeability sandstone reservoirs.
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Tingfang Zhang,Qidong Wang,Linfeng Zhao,Wuwei Chen,Bixin Cai,Mingyue Yan 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.2
In the longitudinal driving of a heterogeneous platoon, external disturbances of local vehicles can cause safety problemsof the intended functionality. Therefore, a cooperative control method based on situation assessment is proposed. First, theminimum safe distance is determined according to the state of adjacent vehicles. A novel situation assessment model isestablished to characterize the stability of the platoon. Vehicle spacing, speed, and acceleration are selected as evaluationindicators. Then, an improved active disturbance rejection controller (IADRC) is designed to improve platoon stabilitythrough feedback compensation control. In addition, considering the unnecessary continuous involvement of the IADRC,its intervention time is determined by the situation assessment results. Finally, simulation and hardware-in-the-loop (HIL)experiments are carried out under two communication topologies. The results show that the proposed method can eff ectivelyimprove the stability and safety of the platoon.
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The enhancement of oxygen sensitivity of ZnO macropore film by functionalizing with azo pigment
Peng, Liang,Zhai, Jiali,Wang, Dejun,Zhang, Yu,Zhao, Qidong,Wang, Ping,Pang, Shan,Fan, Zhiyong,Xie, Tengfeng Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.6
Azo-ZnO hybrid films were prepared by functionalizing the ZnO macropore films with azo pigment (1,1'-(biphenyl-4,4'-diylbis(diazene-2,1-diyl))dinaphthalen-2-ol). Scanning electronic microscopy, current-voltage, UV-Vis absorption spectroscopy and Kelvin probe were used to characterize these films. The oxygen sensing characteristics of hybrid films and pure ZnO film were measured under the irradiation of UV light. The results show that the sensitivity of hybrid film is about 500 times higher than that of pure ZnO film. The high sensitivity to oxygen of hybrid films is mainly attributed to the increasing of the photo-generated electron concentration. Enhanced photo-induced charge separation after functionalization is confirmed by the pattern of transient photovoltage. Our results demonstrate that the functionalization with azo pigment is a promising approach to enhance the oxygen sensitivity of ZnO under the irradiation of UV light.
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