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A Facile and Efficient Synthesis of Dronedarone Hydrochloride
Feng Li,Chunhua Jin,Jianwei Zou,Jun Wu 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
A facile and efficient synthesis of dronedarone hydrochloride starting from commercially available 4- nitrophenol is described. This approach features a tandem-type synthesis of 3-carbonylated benzofuran involving cyclization of 2-ethynylphenol followed by CO2 fixation at the 3-position of the benzofuran ring mediated by potassium carbonate without the addition of any transition metal catalyst.
Regulation Control for Discrete-time Stochastic Nonlinear Active Suspension
Likang Feng,Weihai Zhang,Xiaoyu Zhao,Jianwei Xia,Yajuan Liu 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.3
The regulation problem of discrete-time stochastic nonlinear active suspension is considered in this paper. Firstly, a stability theorem of practically stable in the mean square sense for discrete-time stochastic systems is given. Secondly, the nonlinear active suspension subject to random disturbances modeled by the stochastic difference equation is obtained by the Euler-Maruyama approximation. Thirdly, a state feedback controller is worked out by a discrete backstepping approach such that the states of the discrete-time stochastic nonlinear active suspension can be regulated to a neighbourhood of zero. Finally, the efficiency can be verified by the simulation results.
The characteristics and application of grain-slag media in a biological aerated filter (BAF)
Yan Feng,Liping Qiu,Jianwei Zhang,Longlong Gao,Yanzhen Yu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
Novel filter media-grain slag particles were prepared using waste material-grain slag, clay and poreforming material with a mass ratio of 3:2:1. Compared with haydite, grain-slag had higher total porosity,larger total surface area and lower bulk and apparent density. Tests of heavy metal elements in lixivium proved that grain-slag were safe for wastewater treatment. In order to ascertain the application of grainslag,grain-slag and haydite were applied as the media of biological aerated filters (BAF) to treat municipal wastewater in two lab scale upflow BAFs. The results showed that grain-slag reactor brought a relative superiority to haydite reactor in terms of chemical oxygen demand (CODcr) and ammonia nitrogen (NH3-N) removal at the conditions of water temperature ranging from 20 8C to 26 8C and DO 4.00 mg L1 when hydraulic retention time (HRT) ranging from 1 h to 5 h. In addition, the detection of the amount of hetero bacteria and nitrobacteria of two biological aerated filters in three HRTs also showed that grain-slag medium was more suitable to the attached growth of nitrobacteria, which is helpful to the improvement of nitrification performance in grain-slag BAF. Therefore, grain-slag application in BAF, as a novel process of treating wastes with wastes, provided a promising way in grain slag waste material utilization.
Jianbo Feng,Liyang He,Yanxue Wang,Jianwei Yang,Hongbin Ren 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3
The vehicle platoon is subject to dynamic uncertainty and external disturbance, such as air drag and parameter variation in practice, so lack of consideration for those factors can deteriorate control performance. This paper proposes a nonlinear control algorithm based on a novel adaptive backstepping method to cope with the uncertainty and disturbance. The virtual controller in the backstepping method utilizes only the local information of the individual vehicle, rather than the global state information, in the control algorithm design. A third-order vehicle dynamics model was built to incorporate the nonlinearity and the factor of actuation delay. The fuzzy logic system (FLS) is applied to estimate the nonlinearity in vehicle dynamics to facilitate the adaptive control. Five scenarios with different settings were constructed to verify the control performance in the simulation, which indicates the effectiveness and robustness of the controller to dynamic uncertainty and external disturbance.
A Facile and Efficient Synthesis of Dronedarone Hydrochloride
Li, Feng,Jin, Chunhua,Zou, Jianwei,Wu, Jun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
A facile and efficient synthesis of dronedarone hydrochloride starting from commercially available 4-nitrophenol is described. This approach features a tandem-type synthesis of 3-carbonylated benzofuran involving cyclization of 2-ethynylphenol followed by $CO_2$ fixation at the 3-position of the benzofuran ring mediated by potassium carbonate without the addition of any transition metal catalyst.
Highly efficient and ultra-rapid adsorption of malachite green by recyclable crab shell biochar
Jia Wu,Jianwei Yang,Pu Feng,Lishan Wen,Guohuan Huang,Chuanhui Xu,Baofeng Lin 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
In this study, waste crab shell was hydrothermally carbonized and then activated to prepare an effectiveand recyclable adsorbent. The adsorption performance of the adsorbent for different dyes was investigatedthrough adsorption experiments, and the results showed that it had the largest adsorption performancefor malachite green. Furthermore, the adsorption performance and mechanism of malachite greenwere investigated by static and dynamic adsorption method. The crab shell biochar could remove6142.5 mg g1 of malachite green within 3 minutes, indicating that the crab shell biochar could ultrarapidand highly efficient adsorb malachite green. In addition, the malachite green adsorbed on the crabshell biochar could be removed by calcination, which achieved the entire regeneration of the crab shellbiochar. The adsorption of malachite green by crab shell biochar adsorbent conformed to the pseudosecond-order kinetic model, the Dubinin-Radushkevich and Langmuir isotherm adsorption model. Physical and chemical characterization indicated that the adsorption mechanism of malachite greenincluded alkaline fading effect, hydrogen bonding and p-p interaction.
A Weakly Cationic Temperature Tolerant and Salt Resistant Polymer: Synthesis and Properties
Bo Deng,Xueqin Luo,Feng Jiang,Wei Liu,Jianwei Gu,Chao Liu,Yanan Song 한국고분자학회 2022 Macromolecular Research Vol.30 No.8
In the petroleum industry, water-soluble polymers can be used as oil displacement agents. However, the use of water-soluble polymers is limited because of poor temperature and salt resistance. To improve temperature and salt resistance, a weakly cationic polymer with large side groups (PAM/AMPS/VI) was prepared by copolymerizing acrylamide (AM) with 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and 1-vinylimidazole (VI). The viscosity of PAM/AMPS/VI water solutions can be increased more than 20 mPa·s compared with PAM/AMPS. In addition, the viscosity of the solution increased continuously after aging at 80℃, showing good temperature and salt stability. The protonated tertiary amine in the imidazole ring electrostatically interacts with the sulfonic group, increasing the viscosity and salt resistance of the polymer. The five-membered ring of imidazole also enhances the rigidity of the polymer chain and improves the temperature tolerance. As a confirm of the result, a complete spatial network of PAM/ AMPS/VI was observed in scanning electron microscopy (SEM) micrographs. Using weak cationic polymers with large side groups can provide a reference for the design of new temperature tolerance and salt resistant polymer.
Prediction of tectonic fractures in coal reservoirs using geomechanical method
Xiaolong Fu,Junsheng Dai,Jianwei Feng 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.4
Coalbed methane (CBM) resources are one of the most important and broadly developed unconventional resources. Considering the particularity of the coal, an adapted geomechanical method involving elastic-plastic deformation is badly needed to calculate the fracture parameters of the coal reservoir. Based on the rock mechanics experiments and three-dimensional μCT scan, the fracture evolution of coals can be summed up to initial compaction, propagation and coalescence stage. The microfractures will rapidly connect to each other when reaching 85% peak strength. Based on the plenty of measurement data, the relationship between fracture volume density and stress-strain of coals is established, and the acquisition of the quantitative geomechanical models made it possible to characterize fracture parameters after various tectonic movements under different stress state. Furtherly, the preparation of procedural language for the finite element (FE) simulation platform made it more popular and effective in the prediction of the generation of fractures and spatial distribution. The simulated results of No. 3 coal seam of Shizhuangbei area, both of the fracture density and direction, were in agreement with field observation results, which can be a compelling evidence for the effectiveness of the method.
Wang Xianyao,Wang Huizhen,Lu Junhou,Feng Zhanhui,Liu Zhongshan,Song Hailiang,Wang Heng,Zhou Yanhua,Xu Jianwei 한국조직공학과 재생의학회 2020 조직공학과 재생의학 Vol.17 No.5
BACKGROUND: Mesenchymal stem cell (MSC)-based cell transplantation is an effective means of treating chronic liver injury, fibrosis and end-stage liver disease. However, extensive studies have found that only a small number of transplanted cells migrate to the site of injury or lesion, and repair efficacy is very limited. METHODS: Bone marrow-derived MSCs (BM-MSCs) were generated that overexpressed the erythropoietin (EPO) gene using a lentivirus. Cell Counting Kit-8 was used to detect the viability of BM-MSCs after overexpressing EPO. Cell migration and apoptosis were verified using Boyden chamber and flow cytometry, respectively. Finally, the anti-fibrosis efficacy of EPO-MSCs was evaluated in vivo using immunohistochemical analysis. RESULTS: EPO overexpression promoted cell viability and migration of BM-MSCs without inducing apoptosis, and EPO-MSC treatment significantly alleviated liver fibrosis in a carbon tetrachloride (CCl4) induced mouse liver fibrosis model. CONCLUSION: EPO-MSCs enhance anti-fibrotic efficacy, with higher cell viability and stronger migration ability compared with treatment with BM-MSCs only. These findings support improving the efficiency of MSCs transplantation as a potential therapeutic strategy for liver fibrosis.