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Buckling analysis of elastically-restrained steel plates under eccentric compression
Ying Qin,Gan-Ping Shu,Er-Feng Du,Rui-Hua Lu 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.29 No.3
In this research, the explicit closed-form local buckling solution of steel plates in contact with concrete, with both loaded and unloaded edges elastically restrained against rotation and subjected to eccentric compression is presented. The Rayleigh-Rize approach is applied to establish the eigenvalue problem for the local buckling performance. Buckling shape which combines trigonometric and biquadratic functions is introduced according to that used by Qin <i>et al</i>. (2017) on steel plate buckling under uniform compression. Explicit solutions for predicting the local buckling stress of steel plate are obtained in terms of the rotational stiffness. Based on different boundary conditions, simply yet explicit local buckling solutions are discussed in details. The proposed formulas are validated against previous research and finite element results. The influences of the loading stress gradient parameter, the aspect ratio, and the rotational stiffness on the local buckling stress resultants of steel plates with different boundary conditions were evaluated. This work can be considered as an alternative to apply a different buckling shape function to study the buckling problem of steel plate under eccentric compression comparing to the work by Qin <i>et al</i>. (2018), and the results are found to be in consistent with those in Qin <i>et al</i>. (2018).
Enhanced photoactivity of N-doped TiO2 for Cr(VI) removal: Influencing factors and mechanism
Shu Qin Wang,Wen Bo Liu,Peng Fu,Wei Liang Cheng 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5
To further enhance the photoactivity of virgin TiO2, we prepared N-doped TiO2 (N-TiO2) by sol-gel method and used it to remove Cr(VI) ions from water under visible light. The catalysts were characterized by TEM, XRD, BET and UV-vis techniques. Better crystalline structure, larger specific surface area and decreased band-gap width were obtained after the insertion of N atoms into TiO2 lattice. Several influencing factors were also investigated. The removal efficiency of Cr(VI) increases with the decrease of initial Cr(VI) concentration or the increase of catalyst dosage. Addition of glucose or some inorganic ions (Mg2+, Al3+) can promote the photoreduction process by improving the quantum efficiency. The kinetics and mechanism were discussed as well.
Shu Qin Wang,Ming-Zhu Liu,Li-Li Sun,Wei Liang Cheng 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6
The effects of Ca/S molar ratio, catalyst type, catalyst dosage, temperature on desulfurization and denitrification efficiency were investigated in the coal-powder combustion with corn cobs as biomass. The thermal characteristics of Shanxi coal and corn cob blends with V-TiO2 were evaluated by thermogravimetric analyzer. The catalytic mechanisms of V-TiO2 on combustion, desulfurization and denitrification were discussed, suggesting that the mechanisms are in good agreement with the experimental data. The results show that the control parameters of the ideal desulfurization and denitrification efficiency should follow that the dosage of V-TiO2 catalyst is 8% with a Ca/S ratio of 2.3 at a treatment temperature 850 oC. Meanwhile, the combustion efficiency could be effectively improved with the mixture of corn cob and V-TiO2. The thermal characteristics of coal char and corn cob char blends with V-TiO2 were evaluated using thermogravimetric analysis and derivative thermogravimetry methods to discuss the heterogeneous NO reduction mechanisms. The results show that the biomass chars were more active than coal chars in reducing NO, and the specific surface area of the chars was increased with V-TiO2, which indicates that V-TiO2 exhibits significant influence on catalytic combustion, desulfurization and denitrification.
Efficient photocatalytic removal of aqueous Cr(VI) by N-F-Al tri-doped TiO2
Shu Qin Wang,Yixiao Xie,Wei Liang Cheng,Jian Gao 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.9
As chromium is a common heavy metal contaminant in water, we have prepared N-F-Al tri-doped TiO2 catalyst for Cr(VI) removal under visible light. The sample was prepared via a sol-gel method and was characterized by XRD, BET, UV-vis DRS, XPS and SEM techniques. In the photocatalytic experiments, effects of Al/Ti ratio, F/Ti ratio, calcination temperature and different dopants were investigated. The optimum Al/Ti molar ratio, F/Ti ratio and calcination temperature proved to be 0.01, 0.1 and 500 oC, respectively, which is in accordance with the characterization analysis. Catalysts prepared under this condition showed a high photoactivity for Cr(VI) removal in water.
Shu Qin,Pan Yufang,Hu Hanhua 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.2
Comparative gene identification-58 (CGI-58) is an activating protein of triacylglycerol (TAG) lipase. It has a variety of catalytic activities whereby it may play different roles in diverse organisms. In this study, a homolog of CGI-58 in Phaeodactylum tricornutum (PtCGI-58) was identified. PtCGI-58 was localized in mitochondria by GFP fusion protein analysis, which is different from the reported subcellular localization of CGI-58 in animals and plants. Respectively, PtCGI-58 overexpression resulted in increased neutral lipid content and TAG accumulation by 42-46% and 21-32%. Likewise, it also increased the relative content of eicosapentaenoic acid (EPA), and in particular, the EPA content in TAGs almost doubled. Transcript levels of genes involved in de novo fatty acid synthesis and mitochondrial β-oxidation were significantly upregulated in PtCGI-58 overexpression strains compared with wild-type cells. Our findings suggest that PtCGI-58 may mediate the breakdown of lipids in mitochondria and the recycling of acyl chains derived from mitochondrial β-oxidation into TAG biosynthesis. Moreover, this study potentially illuminates new functions for CGI-58 in lipid homeostasis and provides a strategy to enrich EPA in algal TAGs.
Agile Networking in Smart Grids
Qin, Zhenquan,Zhang, Jianing,Shi, Liang,Wang, Lei,Shu, Lei,Guo, Yuquan The Institute of Electronics and Information Engin 2012 IEIE Transactions on Smart Processing & Computing Vol.1 No.1
Recently, the smart grid (SG) has been introduced to solve the serious network issues caused by the increasing electrical demand and the complex nonlinear nature of the electric power distribution network. The SG, regarded as the next generation power grid, can transmit power in more efficient ways by building an automatic and distributed energy delivery network. In this paper, we first assess how various existing networking technologies, such as IEEE 802.11 (WiFi) and IEEE 802.15.4 (ZigBee), meet the requirements of the SG communication protocols. Specifically, we classify the existing network protocols into three categories: WSN-based networking, WiFi-based networking, and wireline-based networking. We then survey the security issues regarding the SG. Finally, we propose an agile SG networking architecture and show the effectiveness of different adopted networking technologies and, as a result, present a candidate solution to implement agile networking in SGs.
Optimized Charging in Large-Scale Deployed WSNs with Mobile Charger
Qin, Zhenquan,Lu, Bingxian,Zhu, Ming,Sun, Liang,Shu, Lei Korean Society for Internet Information 2016 KSII Transactions on Internet and Information Syst Vol.10 No.12
Restricted by finite battery energy, traditional wireless sensor networks (WSNs) can only maintain for a limited period of time, resulting in serious performance bottleneck in long-term deployment of WSN. Fortunately, the advancement in the wireless energy transfer technology provides a potential to free WSNs from limited energy supply and remain perpetual operational. A mobile charger called wireless charging vehicle (WCV) is employed to periodically charge each sensor node and keep its energy level above the minimum threshold. Aiming at maximizing the ratio of the WCV's vocation time over the cycle time as well as guaranteeing the perpetual operation of networks, we propose a feasible and optimal solution to this issue within the context of a real-time large-scale deployed WSN. First, we develop two different types of charging cycles: initialization cycles and renewable cycles and give relevant algorithms to construct these two cycles for each sensor node. We then formulate the optimization problem into an optimal construction algorithm and prove its correctness through theoretical analysis. Finally, we conduct extensive simulations to demonstrate the effectiveness of our proposed algorithms.
Reaching Byzantine Agreement underlying VANET
( Shu-ching Wang ),( Ya-jung Lin ),( Kuo-qin Yan ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.7
The Internet of Things (IoT) enables machines and devices in a global network to connect and provide applications. The Vehicular Ad-hoc NETwork (VANET) allows vehicles in the network to communicate with each other as an application of the IoT. The safety and comfort of passengers can be improved through VANET related applications. In order to be able to provide related applications, there must be a reliable VANET topology. As a result of the Byzantine agreement (BA), fault tolerance can be solved in VANET. In order to improve the reliability of the system, even if some components in the system are damaged, a protocol is needed to assist the system to perform normally. Therefore, the BA problem in VANET with multiple impairments is revisited in this research. The proposed protocol allows all normal processing elements (PEs) to reach agreement using the least amount of information exchange. Moreover, the proposed protocol can tolerate the largest number of damaged PEs in VANET.