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- 저자 : Hualong Feng (검색결과 3 건)
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Long Lin,Zhiyan Feng,Zhongzhou Dong,Hualong Tao,Chencheng Hu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
For the detection of the more hazardous nitrogen oxides (NO2), there is a need to find a readily fabricated,low-cost, high-performance two-dimensional material. This paper selected three transition metal disulphides(TMDs), MoTe2, MoSe2 and MoS2, as materials for detecting NO2 molecules by density floodingtheory (DFT). The results show that the pure Mo(Te/Se/S)2 monolayer has a poor detection effect onNO2 molecules, and the modified monolayer exhibits better performance than its natural counterpartdue to the significant electron hybridization between the dopant and the gas molecules after the introductionof metal atoms on the surface. It also leads to significant changes in electronic properties andwork functions. The charge transfer mechanism based on Hirshfeld analysis shows that the charge transferfrom the modified substrate to the NO2 molecule improves the binding characteristics. And by discussingthe adsorption structure, adsorption energy, local electron density, density of states, andfrontier orbit theory, we show that MoTe2 is a promising material for gas detection and removal, whichwill provide experimentalists with theoretical guidance for the application of Mo(Te/Se/S)2 based sensingmaterials. Our work is important for predicting novel monosulfide sensing materials and extending theapplication of TMDs as chemical gas sensors in the field of environmental monitoring.
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A new device for restraining rail vibration of ballastless track and its effect study
Zhenxing He,Xu Zhang,Xiaotao Wang,Hualong Zhou,Quanbao Feng,Qingchao Chen,Junxia Chen,Yanbo Bai,Runxi Zhang,Nengneng Bao 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8
A new type of rail vibration damping device (NTRVDV), which is arranged between the bottom of the rail and track bed, is proposed in this paper. The finite element model of the rail system with the NTRVDV and tuned rail damper (TRD) was established, respectively. The impact load was applied to the finite element model, and comparison of the set of existing TRD and NTRVDV on the dynamic response of rail and rail vibration decay rate. The effect of the stiffness change of the elastic layer of the NTRVDV on the rail vibration was studied, and a hammering test verified the theoretical research results. The research results show that compared with the traditional TRD, the NTRVDV has a more obvious suppression effect on rail vibration acceleration. The rail vibration decay rate is significantly improved, especially in the low-frequency stage. With the increase of the stiffness of the elastic layer of the vibration suppression device, the vibration suppression effect of the NTRVDV on the rail is improved. The change of the elastic layer stiffness significantly impacts the rail’s vibration suppression effect in the range of 0-7 kN/mm.
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Zhiqiang Ren,Shenghua He,Jiao Li,Yeguang Wang,Juyi Lai,Zhitao Sun,Hualong Feng,Jian Wang 대한척추신경외과학회 2020 Neurospine Vol.17 No.1
Objective: To assess the safety and effectiveness of percutaneous endoscopic lumbar discectomy (PELD) under epidural anesthesia (EA) and general anesthesia (GA) for treating lumbar disc herniation (LDH). Methods: A retrospective study involving 86 patients with LDH managed by PELD under EA and GA was conducted from July 2018 to March 2019. These patients were divided into 2 groups according to the type of anesthesia. Patient’s demographics data as well as the operation time, complications, fluoroscopy shots, visual analog scale (VAS), Oswestry Disability Index (ODI), Japanese Orthopaedic Association (JOA), and MacNab scores of the 2 groups were recorded. All of the patients were followed-up at 6 months after operation. Results: There were no significant differences were detected in the preoperative demographics between the groups (p>0.05). Two cases (4.8%) under GA developed transient motor weakness, 3 cases (7.4%) presented numbness of lower limb, and 1 case (2.4%) had cauda equina syndrome after operation. In EA group, 1 case (2.2%) had motor weakness and 3 cases (6.7%) had lower limb numbness, which resolved completely at the last follow-up. There was significant difference between preoperative VAS, JOA, and ODI scores and postoperative scores (p<0.01). Moreover, there were no differences in the operation time, fluoroscopy shots, and MacNab scores between the 2 groups (p>0.05). Conclusion: EA and GA in PELD are effective and safe, and no significant difference in complications was observed. Based on our experience, we recommended junior surgeons to perform PELD under EA for getting feedback from the patient to avoid nerve injury and reduce the radiation dose. The concentration of ropivacaine in EA should be considered carefully.
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