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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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Chen, Cheng,Zhou, Hong,Deng, Qijun,Hu, Wenshan,Yu, Yanjuan,Lu, Xiaoqing,Lai, Jingang The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5
Zero-Voltage-Switching (ZVS) operation for a Wireless Power Transfer (WPT) system can be achieved by designing a ZVS controller. However, the performance of the controller in some industrial applications needs to be designed tightly. This paper introduces a ZVS controller design method for WPT systems. The parameters of the controller are designed according to the desired performance based on the closed loop dominant pole placement method. To describe the dynamic characteristics of the system ZVS angle, a nonlinear dynamic model is deduced and linearized using the small signal linearization method. By analyzing the zero-pole distribution, a low-order equivalent model that facilitates the controller design is obtained. The parameters of the controller are designed by calculating the time constant of the closed-loop dominant poles. A prototype of a WPT system with the designed controller and a five-stage multistage series variable capacitor (MSVC) is built and tested to verify the performance of the controller. The recorded response curves and waveforms show that the designed controller can maintain the ZVS angle at the reference angle with satisfactory control performance.
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The Nature of Acid-Catalyzed Acetalization Reaction of 1,2-Propylene Glycol and Acetaldehyde
( Chen Cheng ),( Hui Chen ),( Xia Li ),( Jian Li Hu ),( Bao Chen Liang ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.4
We investigated catalytic activity of ion-exchange resins in acetalization of 1,2-propylene glycol with acetaldehyde. The impacts of reaction variables, such as temperature, reaction time, catalyst loading and feedstock composition, on the conversion of 1,2-propylene glycol were measured. The life of the catalyst was also studied. Furthermore, the reaction kinetics of 1,2-propylene glycol acetalization was studied. It was found that reaction rate followed the firstorder kinetics to acetaldehyde and 1,2-propylene glycol, respectively. Therefore, overall acetalization reaction should follow the second-order reaction kinetics, expressed as r=kC pile{nA#A} C pile{nB#B} =19.74 {-6650} over {T} C pile{1#A} C pile{1#B}.
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