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Hamidreza Roozbahani,Sarah Maghsoodi,Behrouz Raei,Amirhossein Shahbazi Kootenaei,Zoha Azizi 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
La2MMnO6 (M=Co, Ni) dual perovskite oxides were synthesized by sol-gel and gel-combustion methods and tested for the total oxidation of propane. The synthesized catalysts were characterized by TPR, XRD, ICP, SEM, TEM, H2-TPR and O2-TPD techniques. The preparation method had a significant effect on the physicochemical properties of samples. The XRD spectra resulting from the synthesized samples revealed the formation of single-phase perovskite structure. The largest BET specific surface area related to the La2NiMnO6 perovskite synthesized by the gelcombustion method was obtained as 35m2g1 after calcination at 500 oC. Based on the findings, the catalysts synthesized by the gel-combustion method showed an increase in specific surface area, oxygen capacity, reducibility and oxygen mobility compared to those synthesized by the sol-gel method. Accordingly, these catalysts revealed a better performance. The acquired results also showed that the presence of Ni improved the catalytic activity compared to Co. The La2NiMnO6 perovskite synthesized by the gel-combustion method with the T90 equal to 415 oC was found to be the most active catalyst, while the La2CoMnO6 double perovskite synthesized by the sol-gel method with the T90 equal to 474 oC demonstrated the lowest activity.
Youngjoon Cho,Hamidreza Raei,Kyihwan Park 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
ToF(Time of Flight) LiDAR detects the target distance by measuring the timing difference of the pulsed laser beam to the target and received signal. The intensity of the received signal varies with a number of factors. The measured timing can be vary depending on the different magnitude of the signals. It is required to control the amplifying gain to ensure accurate distance measurement with wide range of intensity. In this work, the distance accuracy is investigated when TDC measures the pulse signals. The electronic characteristic of MOSFET is treated and transformed to use it as a variable resistor. Auto Gain Control method is introduced by implementing MOSFET which has a variable resistance characteristics. As a result, simulations are carried out to investigate the AGC operation. The limitation and additional frequency issues will be treated for a next work.