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36 results on '"Bao, Fengyu"'

7. New 2-Tuple Linguistic Aggregation Distance Operator and Its Application to Information Systems Security Assessment

Author

Zeng, Shouzhen, Pan, Tiejun, Bi, Jianxin, Zhang, Chonghui, Bao, Fengyu, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, Abawajy, Jemal, editor, Choo, Kim-Kwang Raymond, editor, and Islam, Rafiqul, editor

Published
2018
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13. FeCl3‐Catalyzed Highly Diastereoselective Synthesis of Polyhydrobenzo[a]acridinones.

Author

Wang, Zongkang, Qin, Zhengchen, Yang, Yajie, Jin, Shuxin, Bao, Fengyu, and Li, Yanzhong

Abstract

FeCl3‐catalyzed diastereospecific synthesis of tetrahydrobenzo[a]acridin‐5(6H)‐ones from enaminones was described. Single diastereoisomers were obtained in good to excellent yields. Two C−C bonds and three contiguous stereogenic centers were formed. [ABSTRACT FROM AUTHOR]

Published
2022
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21. Synthesis of micronized CaO assisted by NH4HCO3 with Ca(OH)2 and its application in heterogeneously catalyzing transesterification reaction for producing biodiesel.

Author

Bai, Haixin, Liu, Xiaohua, Bao, Fengyu, and Zhao, Zhonglin

Subjects
TRANSESTERIFICATION, X-ray emission spectroscopy, ENERGY dispersive X-ray spectroscopy, FOURIER transform infrared spectroscopy, HETEROGENEOUS catalysts, CATALYTIC activity, X-ray fluorescence
Abstract

Micronized CaO with pores was synthesized by calcining the reaction product CaCO3 from NH4HCO3 and Ca(OH)2. Scanning electron microscopy, X‐ray diffraction, energy dispersive X‐ray spectroscopy, X‐ray fluorescence, Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller analysis were used to characterize CaO, which confirmed that after calcining at 800°C for 2 hr, CaCO3 was completely converted into porous micronized CaO with a surface area of about 7.295 m2/g and a particle size of 0.5–1.5 μm. The porous CaO microparticles were used as heterogeneous catalysts for producing biodiesel from transesterification of soybean oil and methanol. The influences of reaction time, calcined temperature, and reusability of CaO were explored. The experiments showed that CaO has high catalytic activity for transesterification reaction, and the yield of biodiesel reaches more than 98% under the conditions of methanol/oil mole ratio of 9, and the catalyst amount (catalyst/oil) of 3% after reaction for 2.5 hr. The CaO catalyst can be recycled easily and it also has the advantage of low pollution. Simple synthetic route, low cost, high catalytic activity, good reusability, and great potential for industrialization are the advantages of the porous micronized CaO catalyst that was proposed in this work. [ABSTRACT FROM AUTHOR]

Published
2019
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23. Path planning based on geodesic for mobile robots

Author

Bao Fengyu, Hu Yongqiang, Gu Zhongping, and Li Bing

Subjects
Geodesic, Relation (database), ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, MathematicsofComputing_GENERAL, Mobile robot, Surface (topology), Topology, Maxima and minima, Path (graph theory), Mathematics::Metric Geometry, Robot, Mathematics::Differential Geometry, Motion planning, ComputingMethodologies_COMPUTERGRAPHICS, Mathematics
Abstract

In this paper, a geodesic-based method is proposed for the robot path planning problem. The geodesic, on the smooth curved surface constructed by potential field, is used to provide the robot a path to the target without trapping in the local minima. The relation between the potential and the geodesic is analyzed and some local properties of the geodesic are obtained, which are used to adjust the direction of the geodesic-based path. The proposed approach based on the data obtained by the sensor can be applied to the dynamical environment and it is verified by simulations.

Published
2015

24. Synthesis of micronized CaO assisted by NH4HCO3with Ca(OH)2and its application in heterogeneously catalyzing transesterification reaction for producing biodiesel

Author

Bai, Haixin, Liu, Xiaohua, Bao, Fengyu, and Zhao, Zhonglin

Abstract

Micronized CaO with pores was synthesized by calcining the reaction product CaCO3from NH4HCO3and Ca(OH)2. Scanning electron microscopy, X‐ray diffraction, energy dispersive X‐ray spectroscopy, X‐ray fluorescence, Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller analysis were used to characterize CaO, which confirmed that after calcining at 800°C for 2 hr, CaCO3was completely converted into porous micronized CaO with a surface area of about 7.295 m2/g and a particle size of 0.5–1.5 μm. The porous CaO microparticles were used as heterogeneous catalysts for producing biodiesel from transesterification of soybean oil and methanol. The influences of reaction time, calcined temperature, and reusability of CaO were explored. The experiments showed that CaO has high catalytic activity for transesterification reaction, and the yield of biodiesel reaches more than 98% under the conditions of methanol/oil mole ratio of 9, and the catalyst amount (catalyst/oil) of 3% after reaction for 2.5 hr. The CaO catalyst can be recycled easily and it also has the advantage of low pollution. Simple synthetic route, low cost, high catalytic activity, good reusability, and great potential for industrialization are the advantages of the porous micronized CaO catalyst that was proposed in this work. Porous micronized CaO was easily prepared by calcining reaction product of NH4HCO3and Ca(OH)2, which presented a good activity and reusability in catalyzing transesterification reaction of oil with methanol for biodiesel. Simply synthetic route, low cost, high catalytic activity and great potential of industrialization production are the highlight attractiveness of the porous CaO microparticles, which was proposed in this work.

Published
2019
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34. FeCl3‐Catalyzed Highly Diastereoselective Synthesis of Polyhydrobenzo[a]acridinones

Author

Wang, Zongkang, Qin, Zhengchen, Yang, Yajie, Jin, Shuxin, Bao, Fengyu, and Li, Yanzhong

Abstract

FeCl3‐catalyzed diastereospecific synthesis of tetrahydrobenzo[a]acridin‐5(6H)‐ones from enaminones was described. Single diastereoisomers were obtained in good to excellent yields. Two C−C bonds and three contiguous stereogenic centers were formed. An FeCl3‐catalyzedhighly diastereoselective synthesis of tetrahydrobenzo[a]acridin‐5(6H)‐ones starting from enaminone derivatives was developed. Two C−C bonds and three contiguous stereogenic centers were formed. At the same time, the reaction also had the advantages of high atom economy, mild conditions, and excellent yield.

Published
2022
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35. Ligand-free iron-catalyzed benzylic C (sp 3 )-H amination of methylarenes with N -fluorobenzenesulfonimide.

Author

Bao F, Cao Y, Liu W, and Zhu J

Abstract

Direct conversion of cheap methylarenes to benzylic amines, which are essential structural units of important drugs, is of great significance. However, the known methodologies suffer from the requirement of noble metal catalysts, heavy metal residues or strong oxidants. Herein, the first biocompatible iron-catalyzed benzylic C (sp 3 )-H amination of methylarenes with N -fluorobenzenesulfonimide is described. The reactions of methylarenes bearing electron-donating groups and electron-withdrawing groups ran smoothly under ligand and additional oxidant free conditions. Both toluene derivatives and 8-methylquinoline can be aminated by the same iron catalyst., Competing Interests: The authors declare no conflict of interest., (This journal is © The Royal Society of Chemistry.)

Published
2019
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36. Synthesis of 1,1,4,4-tetrabromo-2-butenes and related compounds via desilylation-bromination of silylated 1,3-butadiene derivatives.

Author

Xi Z, Liu X, Lu J, Bao F, Fan H, Li Z, and Takahashi T

Abstract

The combination of zirconocene-mediated coupling of silylated alkynes with a protonation-desilylation or bromination-desilylation process afforded otherwise unavailable butadiene derivatives. When (E,E)-2,3-dialkyl-1,4-bis(trimethylsilyl)-1,3-butadienes were treated with 3 equiv of Br(2) in CH(2)Cl(2), (E)-2,3-dialkyl-1,1,4,4-tetrabromo-2-butenes were obtained in excellent yields with perfect stereoselectivity.

Published
2004
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