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Controlling the attitude of linear time-varying model LEO satellite using only electromagnetic actuation
, Article 2002 IEEE Aerospace Conference, Big Sky, MT, 9 March 2002 through 16 March 2002 ; Volume 5 , 2002 , Pages 2221-2230 ; 1095323X (ISSN); 078037231X (ISBN); 9780780372313 (ISBN) ; Momeni, H. R ; Sadati, N ; Baclou, H. G ; Sharif University of Technology
2002
Abstract
Recently small satellites are used more commonly because of the low launching cost and development of microelectronics. Also lower weight, size, cost and the power consumption of magnetorquer, has made the application of them in controlling attitude of the satellites common. Intensive changes and non-ability of geomagnetic field are some of the problems, which have limited the efficiency of magnetorquers. In this paper a new control method is presented that keeps the attitude of satellite in desired condition only by electromagnetic coils. The distinction of this method is its abilities in comparison with other methods. In this analytic method a direct relation between design parameters,...
Effect of Gd and Co contents on the microstructural, magneto-optical and electrical characteristics of cobalt ferrite (CoFe2O4) nanoparticles
, Article Ceramics International ; 2021 ; 02728842 (ISSN) ; Yousaf, M ; Akhtar, M. N ; Noor, A ; Akbar, M ; Shah, M. A. K. Y ; Yan, S ; Wang, F ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Rare earth oxides with a trivalent nature play a pivotal role in reinforcing the magneto-optical attributes of spinel ferrite nanoparticles by replacing Fe3+ ions. In this study, rare earth Gd oxide doped with CoFe2O4 NPs with a composition of Co1+xGdxFe2-2xO4 (x = 0, 0.05, 0.10, and 0.15) were synthesized using sol-gel auto-combustion. The outcome of Gd cations on the physical, magneto-optical and electrical characteristics of the cobalt ferrite NPs were reported. X-ray diffraction (XRD), and Fourier transform infrared (FTIR) investigations confirmed the single-phase cubic crystalline nature and metal ion stretching in the cobalt ferrite synthesized samples. Decreasing drift in the average...
Effect of Gd and Co contents on the microstructural, magneto-optical and electrical characteristics of cobalt ferrite (CoFe2O4) nanoparticles
, Article Ceramics International ; Volume 48, Issue 2 , 2022 , Pages 2782-2792 ; 02728842 (ISSN) ; Yousaf, M ; Akhtar, M. N ; Noor, A ; Akbar, M ; Shah, M. A. K. Y ; Yan, S ; Wang, F ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Rare earth oxides with a trivalent nature play a pivotal role in reinforcing the magneto-optical attributes of spinel ferrite nanoparticles by replacing Fe3+ ions. In this study, rare earth Gd oxide doped with CoFe2O4 NPs with a composition of Co1+xGdxFe2-2xO4 (x = 0, 0.05, 0.10, and 0.15) were synthesized using sol-gel auto-combustion. The outcome of Gd cations on the physical, magneto-optical and electrical characteristics of the cobalt ferrite NPs were reported. X-ray diffraction (XRD), and Fourier transform infrared (FTIR) investigations confirmed the single-phase cubic crystalline nature and metal ion stretching in the cobalt ferrite synthesized samples. Decreasing drift in the average...