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RISS 인기검색어
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- 저자 : Wang Bowei (검색결과 5 건)
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Evacuation of Nursing Home Based on Massmotion: Effect of the Distribution of Dependent Elderly
Jia Li,Jinghong Wang,Bowei Jin,Yan Wang,Youran Zhi,Zhirong Wang 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.4
As dramatically increased elderly population, China is entering a society of deep aging. Due to the decline of physical functions, the elderly move slowly and have difficulty in escape. Hence, enough attention should be paid on pedestrian crowds’ evacuation in a nursing home. This paper takes Chinese old-age care institutions as the research object. Using the Massmotion based on the social force to establish the evacuation model and setting the parameters according to the movement characteristics of the elderly, this paper studied the influence of the dependent elderly on evacuation efficiency when they are distributed to the higher floors of the nursing home in different proportions. The results show that the evacuation time is significantly prolonged with the increase of the proportion of dependent elderly, and there is a controllable critical value for the proportion of dependent elderly. Aspeed-up phenomenon is observed when the old man enters the landing from the stairway, and meanwhile, with the increase of the proportion of dependent elderly, the acceleration position is gradually advanced, while the instantaneous speed declines. The results of this study can provide references in properly arranging the distribution of elderly accommodation and safe evacuation of the aged care institutions.
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Gao, Bowei,Yao, Huifeng,Jang, Bomee,Zhu, Jie,Yu, Runnan,Cui, Yong,Wang, Fenghao,Hou, Junxian,Woo, Han Young,Hou, Jianhui The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.6
<P>Here, the crucial role of intermolecular π-π interactions in A-D-A-type acceptors is examined and a simple yet effective modulation method is presented. By side chain manipulation, two small molecule acceptors, IDT-C6 and IDT-PhC6, are designed and synthesized with different crystalline morphologies. Since <I>n</I>-hexyl side chains have less steric hindrance than hexylphenyl side chains, IDT-C6 exhibits enhanced intermolecular π-π interactions relative to IDT-PhC6. Benefiting from the improved charge transport properties of the IDT-C6-based device, a high PCE of 12.5% is recorded, whereas those of the IDT-PhC6-based device delivers a moderate PCE of just 5.6%.</P>
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Yan Wang,Yong Zhang,Xiaolin Liu,Sen Sun,Shiyi Qin,Jiaqi Huang,Bowei Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
To obtain a green, low-cost and efficient adsorbent, polydopamine (PDA) and b-cyclodextrin (b-CD) wereadopted to modify coal fly ash (CFA) to prepare polydopamine/b-cyclodextrin/coal fly ash composite(PDA/b-CD/CFA). The successful introduction of PDA and b-CD was proved by FT-IR, XRD and XPS. Theuranium extraction efficiency on PDA/b-CD/CFA reached 95.6% (pH = 5.0, T = 298 K, C0 = 10 mg/L andm/V = 0.2 g/L) and the whole adsorption process was perfectly fitted by the Pseudo-second-order model(R2 = 0.999), illustrating that uranium was extracted via chemisorption. The correlation coefficient R2 ofLangmuir model was 0.999, which was higher than other models, meaning that uranium extractionbehavior on PDA/b-CD/CFA was uniform monolayer adsorption. The maximum extraction capacity of uraniumon PDA/b-CD/CFA calculated by Langmuir model was 537.6 mg/g, which was larger than most ofreported adsorbents, indicating that PDA/b-CD/CFA was a potential candidate for uranium extractionfrom water environment. Moreover, PDA/b-CD/CFA performed excellent uranium extraction propertieswith the existence of coexisting ions and the desorption efficiency of uranium by PDA/b-CD/CFA washigher to 95.8% at the fifth cycles, fully suggesting that PDA/b-CD/CFA possessed good selectivity andcycle stability. Characterization results demonstrated that uranium was immobilized on PDA/b-CD/CFAthrough chelation, complexing action, electrostatic interaction and hydrogen bonding.
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Water film covering characteristic on horizontal fuel rod under impinging cooling condition
Zhang Penghui,Wang Bowei,Chen Ronghua,Su G.H.,Tian Wenxi,Qiu Suizheng 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11
Jet impinging device is designed for decay heat removal on horizontal fuel rods in a low temperature heating reactor. An experimental system with a fuel rod simulator is established and experiments are performed to evaluate water film covering capacity, within 0.0287e0.0444 kg/ms mass flow rate, 0 e164.1 kW/m2 heating flux and 13.8e91.4C feeding water temperature. An effective method to obtain the film coverage rate by infrared equipment is proposed. Water film flowing patterns are recoded and the film coverage rates at different circumference angles are measured. It is found the film coverage rate decreases with heating flux during single-phase convection, while increases after onset of nucleate boiling. Besides, film coverage rate is found affected by Marangoni effect and film accelerating effect, and surface wetting is significantly facilitated by bubble behavior. Based on the observed phenomenon and physical mechanism, dry-out depth and initial dry-out rate are proposed to evaluate film covering potential on a heating surface. A model to predict film coverage rate is proposed based on the data. The findings would have reliable guide and important implications for further evaluation and design of decay heat removal system of new reactors, and could be helpful for passive containment cooling research.
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Selective Synthesis of N,N-Bis(3-dimethylaminopropyl)amine over Pd/γ-Al2O3
Chenhui Lin,Bowei Wang,Haotian Guo,Ligong Chen,Xilong Yan 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.3
The synthesis of N,N-bis(3-dimethylaminopropyl)amine (BPA) from 3-(dimethylamino)-propionitrile (PN) and 3-(N,N-dimethylamino)propylamine (PA) over Pd/γ-Al2O3 in autoclaves was investigated. A series of Pd catalysts were prepared by different methods and characterized by XRD, TEM, and N2 adsorption–desorption. It was found that their activities were obviously affected by calcination temperature and reducing agent. Among them, the catalyst calcined at 500 °C and reduced with NaBH4 exhibited the best performance in this reaction. It was possibly attributed to the better dispersion of palladium particles on γ-Al2O3. Furthermore, reaction parameters were also optimized. Under optimal conditions (PN/PA molar radio 1:1, toluene as solvent), BPA was obtained in 87.9% yield with 95.6% conversion over the above catalyst. Meanwhile, split of PN was observed. A probable mechanism of retro-Michael reaction was also proposed.
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