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S. Iwan,D. Dianisya,Riser Fahdiran,Isnaeni,Esmar Budi,Anggara Budi Susila,Erfan Handoko 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
We have synthesized un-doped and Co-doped ZnO nanoparticles (NPs) by precipitation method at a temperature of 400 oC for 2 hours. According to the inorganic crystal structure database (ICSD) number #98-005-7478, the XRD pattern of ZnO NPs (average diameter of 99-144 nm) possess polycrystalline hexagonal wurtzite structure. The crystallite size of un-doped and 1.75 at.%, 3.79 at.%, 4.37 at.% Co-doped ZnO NPs are 20.81 nm, 19.84 nm, 43.85 nm, 37.95 nm, respectively. Meanwhile, the average micro-strain of the un-doped ZnO NPs and 1.75 at.%, 3.79 at.%, 4.37 at.% Co-doped ZnO NPs are 0.62%, 0.66%, 0.29%, 0.34%. These results confirm the crystallite size and micro-strain changing by Co incorporation. Further investigation, the Co incorporation into Zn site improve absorbance of ZnO NPs. Meanwhile, photoluminescence (PL) measurement shows that all ZnO NPs have one broad emission with centered peaks of 385 nm. It is indicating the substitution Zn2+ by Co2+ cause the distribution defect spread continuously in ZnO NPs structure
Design of 3 Stage Electro-Hydraulic Servovalve
Istanto Iwan(이완 이스탄토),S. W. Ji(지상원),H. H. Kim(김현호),L. Y. Lee(이일영),S. H. Kim(김상호),H. C. Lee (이현철) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.6
In this paper, design of 3 stage electro-hydraulic servovalve is presented. At first, various physical parameters of servovalve are measured, then physical modeling for three-stage electro-hydraulic servovalve was developed based on the full mathematical model of servovalve. According to its mathematical model, Matlab/Simulink was used to develop a simulation model. Secondly, acquired Simulink model was verified in the step response and frequency response by comparing the simulation result to the experimental result (Moog Inc. catalog data). Lastly, various suspected parameters that affect on the performance of main valve in the 3 stage electrohydraulic servovalve is analyzed in detail.