EEIOT_51 Rajeev Kumar - Academia.edu (original) (raw)
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Papers by EEIOT_51 Rajeev Kumar
Energy storage technology is still a restriction to limit the commercialization of HEV since its ... more Energy storage technology is still a restriction to limit the commercialization of HEV since its high cost, short mileage and long charge time. Flywheel energy storage system(FESS) is a new way to storage energy in HEV, which can solve those problems mentioned above. Magnetic bearing is the key point of FESS. To research the characteristic of axial-active, radial-passive hybrid magnetic bearing, finite element analysis method is introduced to set up the model of axial and radial structure. Forces of different displacement and the possibility of rotor floating are analyzed, and one kind of operating point is obtained. In the final analysis, the whole magnetic bearing is developed, and experiment system is built to get the relations between axial electromagnetism force and axial displacement, and also to get floating current at different axial displacement from experiment. It can be concluded that the results of experiment and simulation are in good agreement. With the comparison between the results of experiment and finite element analysis method, correctness and validity of the finite element analysis method are verified. It provides a calculation method and theoretical reference for the further research of magnetic bearing.
Geosystem Engineering, 2010
Polyhedron, 2005
The compound Fe 8 (C 36 H 120 O 23 N 18 Fe 8 Br 8) was examined for its potential as a contrast a... more The compound Fe 8 (C 36 H 120 O 23 N 18 Fe 8 Br 8) was examined for its potential as a contrast agent for magnetic resonance imaging. The compound was prepared, isolated, and shown to exhibit superparamagnetism (S = 10). The structure of Fe 8 in aqueous solution was probed by several NMR techniques. Relaxivity of aqueous solutions of Fe 8 as well as that of comparison compounds FeCl 3 , FeCl 3 (tacn) (tacn = 1,4,7-triazacyclononane), and Gd(DTPA) (DTPA = diethylenetriamine pentaacetic acid) were determined by T 1 and T 2 inversion recovery and CPMG sequences. In contrast to a previous report, the relaxivity of Fe 8 solutions was found to be weak compared to Gd(DTPA). However, an interesting dependence upon pH was observed. The influence of environmental factors on relaxivity is of interest in the burgeoning field of molecular imaging.
Energy storage technology is still a restriction to limit the commercialization of HEV since its ... more Energy storage technology is still a restriction to limit the commercialization of HEV since its high cost, short mileage and long charge time. Flywheel energy storage system(FESS) is a new way to storage energy in HEV, which can solve those problems mentioned above. Magnetic bearing is the key point of FESS. To research the characteristic of axial-active, radial-passive hybrid magnetic bearing, finite element analysis method is introduced to set up the model of axial and radial structure. Forces of different displacement and the possibility of rotor floating are analyzed, and one kind of operating point is obtained. In the final analysis, the whole magnetic bearing is developed, and experiment system is built to get the relations between axial electromagnetism force and axial displacement, and also to get floating current at different axial displacement from experiment. It can be concluded that the results of experiment and simulation are in good agreement. With the comparison between the results of experiment and finite element analysis method, correctness and validity of the finite element analysis method are verified. It provides a calculation method and theoretical reference for the further research of magnetic bearing.
Geosystem Engineering, 2010
Polyhedron, 2005
The compound Fe 8 (C 36 H 120 O 23 N 18 Fe 8 Br 8) was examined for its potential as a contrast a... more The compound Fe 8 (C 36 H 120 O 23 N 18 Fe 8 Br 8) was examined for its potential as a contrast agent for magnetic resonance imaging. The compound was prepared, isolated, and shown to exhibit superparamagnetism (S = 10). The structure of Fe 8 in aqueous solution was probed by several NMR techniques. Relaxivity of aqueous solutions of Fe 8 as well as that of comparison compounds FeCl 3 , FeCl 3 (tacn) (tacn = 1,4,7-triazacyclononane), and Gd(DTPA) (DTPA = diethylenetriamine pentaacetic acid) were determined by T 1 and T 2 inversion recovery and CPMG sequences. In contrast to a previous report, the relaxivity of Fe 8 solutions was found to be weak compared to Gd(DTPA). However, an interesting dependence upon pH was observed. The influence of environmental factors on relaxivity is of interest in the burgeoning field of molecular imaging.