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RISS 인기검색어
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- 저자 : Zhang Xiangwen (검색결과 5 건)
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Zhang Xiangwen 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.3
The regenerative braking system can recover the braking energy to extend the mileage of electric vehicles, however, recovering more energy and ensuring the braking stability are conflicted each other. In addition, during the downhill process, the road slope angle has a great influence on braking stability and braking energy recovery efficiency. In this study, considered the road slope angle estimation, the fixed ratio and variable ratio braking forces optimization distribution methods are designed based on the vehicle stability demand, and the regenerative braking control strategies are proposed to recovery more energy with the designed braking forces distribution methods. In this way, the conflict between braking stability and energy recovery can be solved. In order to verify the strategies, the system model, road condition and driving intentions are established on dSPACE’s ASM and Simulink co-simulation platform, and the regenerative braking control strategies are realized and simulated on different slope roads and UDDS urban road cycle conditions. The results show that the estimated error of the road slope angle can be within 0.4°. The two strategies can ensure the vehicle braking stability. The recovered energy increases obviously with the increase of slope angle. The optimization distribution methods have a better energy recovery effect than the unoptimized methods, the optimal variable ratio method increases the recovered energy by up to 3.67 %, and the optimal fixed ratio method increases the recovered energy by up to 3.38 %.
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REGENERATIVE BRAKING CONTROL STRATEGY OF ELECTRIC VEHICLES BASED ON BRAKING STABILITY REQUIREMENTS
Jiang Biao,Zhang Xiangwen,Wang Yangxiong,Hu Wenchao 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.2
Electric vehicles are effective way to solve energy and environmental problems, but the promotion and application of electric vehicles are suppressed by their limited endurance range seriously. The regenerative braking technology is an important method to increase the endurance range of the electric vehicle. During the braking process, the kinetic energy of the electric vehicle can be converted into electric energy and stored in the energy source device with the regenerative braking system, so the endurance range of the electric vehicle can be increased accordingly. In order to increase the efficiency of energy recovery, a regenerative braking strategy with the optimization distribution algorithm is proposed in this paper, and the braking forces of the front and rear axles are distributed optimally with variable ratios based on the braking strength. With the optimal braking force distribution ratio and related constraint conditions, the regenerative braking control strategy was designed to meet the braking stability and the maximum braking energy recovery. And then a simulation model of the braking control strategy was built with MATLAB/Simulink software, and the simulation tests on UDDS and NEDC cycle conditions were done to verify the effectiveness of the designed regenerative braking control strategy. Compared with the control strategy of ADVISOR software, the braking energy recovery efficiency was improved more than 51.9 % while maintaining the braking stability.
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The vertical distribution and temporal occurrence of three types of rice planthoppers in Shanghai
Wang Dongsheng,Wu Xiangwen,Yuan Yongda,Zhang Tianshu,Shen Huimei,Du Xingbin,Teng Haiyuan,Chang Xiaoli 한국곤충학회 2022 Entomological Research Vol.52 No.1
In this study, we investigated the dynamic occurrence and vertical distribution of three types of rice planthoppers (Nilaparvata lugens, Sogatella furcifera,and Laodelphax striatellus) in Shanghai, China. Our results showed that S. furcifera and L. striatellus infested the lower part of rice plants in the early development stage, S. furcifera and L. striatellus inhabited every part of rice in the middle development stage, and L. striatellus and N. lugens formicated in the upper part of the rice plant in the posterior development stage. The populations of rice planthoppers were larger in July and September, Where more than 600 adult and nymphal planthoppers, per a hundred hills of rice, were found in late July, and out of the 600, the majority were the nymphs of S. furcifera and L. striatellus. S. furcifera was mainly found from July to October, L. striatellus during the rice development, and N. lugens after September, during which their maximal individual number, per a hundred hills of rice, was 480, 220, less than 50, respectively. In addition, our results showed that adult rice planthoppers were mostly observed from late August to mid-October with the highest population being found during mid to late September. The adult S. furcifera, L. striatellus,andN. lugens were mostly observed in August and September, from August to October, and past mid-September, respectively. Moreover, the number of adult L. striatellus that were sticking to yellow sticky card was significantly higher than that of S. furcifera and N. lugens.
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Guo Zu,Jing Guo,Tingting Zhou,Ningwei Che,Baiying Liu,Dong Wang,Xiangwen Zhang 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-
FoxM1 is involved in the regeneration of several organs after injury and expressed in the intestinal mucosa. The intrinsic mechanism of FoxM1 activity in the mucosa after intestinal ischemia/reperfusion (I/R) injury has not been reported. Therefore, we investigated the role of FoxM1 in mediating intestinal mucosa regeneration after I/R injury. Expression of FoxM1 and the proliferation of intestinal mucosa epithelial cells were examined in rats with intestinal I/R injury and an IEC-6 cell hypoxia/reperfusion (H/R) model. The effects of FoxM1 inhibition or activation on intestinal epithelial cell proliferation were measured. FoxM1 expression was consistent with the proliferation of intestinal epithelial cells in the intestinal mucosa after I/R injury. Inhibition of FoxM1 expression led to the downregulation of Ki67 expression mediated by the inhibited expression of Nurr1, and FoxM1 overexpression promoted IEC-6 cell proliferation after H/R injury through activating Nurr1 expression. Furthermore, FoxM1 directly promoted the transcription of Nurr1 by directly binding the promoter of Nurr1. Further investigation showed low expression levels of FoxM1, Nurr1, and Ki-67 in the intestinal epithelium of patients with intestinal ischemic injury. FoxM1 acts as a critical regulator of intestinal regeneration after I/R injury by directly promoting the transcription of Nurr1. The FoxM1/ Nurr1 signaling pathway represents a promising therapeutic target for intestinal I/R injury and related clinical diseases.
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