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- 저자 : Hongmei Cui (검색결과 3 건)
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MOF-Derived Porous CeO2-x/C Nanorods and their Applications in Uric Acid Biosensor
Jinbao Luo,Jiewu Cui,Yan Wang,Dongbo Yu,Yongqiang Qin,Hongmei Zheng,Yu Hong,Yong Zhang,Yucheng Wu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.7
Selectivity is significant to the practical applications of electrochemical biosensors in clinical and diagnostic field. In this paper, porous CeO2-x/C nanorods (NRs) derived from Ce-based metal organic framework (MOF) were synthesized and employed as substrate to construct uric acid biosensors with high sensitivity and selectivity at low working potential. The morphology, microstructures and elemental states of as-prepared samples were investigated by SEM, XRD, TEM and XPS systematically. It was found that a great amount of oxygen vacancies was introduced into the interstitial of CeO2 and nonstoichiometric CeO2/C (CeO2-x/C) nanorods based on Ce-MOF were formed under calcination in Ar atmosphere. The increased oxygen vacancies enabled the negatively shifting of the working potential towards H2O2 detection for CeO2-x/C nanorods, favoring the construction of biosensors based on the detection of H2O2. Uric biosensors based on CeO2-x/C NRs exhibited a high sensitivity of 220.0 μA · cm -2 · mM -1 and a linear range from 50 μM to 1000 μM at working potential of -0.4 V versus SCE. It also exhibited superior selectivity toward interferents coexisting with uric acid in urine due to the low working potential.
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Effects of strain on electronic properties of monolayer a-Fe2O3
Changmin Shi,Li C,Dongchao Wang,Hongmei Liu,Guangliang Cui,Lijie Qiao 한국물리학회 2016 Current Applied Physics Vol.16 No.5
Density functional theory was employed to study the strain-induced modification of electronic properties of advanced monolayer a-Fe2O3 for the first time. Theoretical results indicated that there was obvious dependency of band structure on strain. The band gap modulation could reach up to 29.0% for 7% compressive strain and to 10.6% for 7% tensile strain. The analytical results of fat-band structures demonstrated that the considerable modulation range of band gaps was mainly caused by the Fe-dz2 orbital.
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Fatigue life prediction and reliability analysis of the forage crusher rotor
Haixu Zhao,Zhiping Zhai,Yingsheng Mou,Le Liu,Yuezheng Lan,Hongmei Cui 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.4
To accurately predict fatigue life and reliability of the forage crusher rotor, the stress load spectrum of the rotor is obtained via the two-way fluid-structure coupling method, which calculates the coupled flow field in the forage crusher and rotor structure. The fatigue life of the rotor is predicted, and its reliability is analyzed. Finally, the rotor is optimized by a multiisland genetic algorithm. The results indicate that the fatigue life prediction based on fracture mechanics theory and the Gerber average stress correction method is more suitable for the prediction of the rotor’s fatigue life. After optimization, the fatigue life cycles of the rotor are increased from 1.229×10 8 to 7.67×10 8 and the reliability is increased from 89.4 % to 99.7 %. This meets the reliability requirement of key parts of agricultural and animal husbandry machinery. This study provides a reference for the prediction and optimization of fatigue life and reliability of forage crushers.
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