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Rajesh, R.
- Dual Transmitter–Receiver Electromagnetic System for Lateral Boundary Detection of Subsurface Formations
Abstract Views :199 |
PDF Views:68
Authors
R. Rajesh
1,
V. S. Sarma
1
Affiliations
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
1 CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, IN
Source
Current Science, Vol 114, No 08 (2018), Pagination: 1747-1751Abstract
A new frequency domain electromagnetic system, based on different working principle has been designed and its efficacy tested over the existing systems through laboratory-scale-model studies. In this system, two transmitter coils have been employed to generate a magnetic null plane at their geometric centre. The receiver coil is placed in the null plane to record the induced secondary field. The interaction of the primary field is almost negligible on the secondary field recorded by the receiver. We present the theory and physical model results describing the system parameters and efficacy. The testing through physical model studies suggests an increased depth of detection in this new configuration compared to the existing systems. In terms of secondary field, the strength of the anomaly reflects the magnetic permeability/susceptibility difference of the subsurface medium on either side of the receiver. The study concludes that there is significant increase in depth of investigation and secondary field strength in this system over the existing conventional frequency domain systems and also more robust for boundary detection.Keywords
Conducting Bodies, Electromagnetic System, Magnetic Permeability, Physical Model Studies, Susceptibility.Full Text
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- Improvement on the Characteristics of Transformer Oil using Nanofluids
Abstract Views :231 |
PDF Views:97
Authors
S. Sumathi
1,
R. Rajesh
2
Affiliations
1 Department of Electrical and Electronics Engineering, Anna University, Regional Campus, Coimbatore 641 046, IN
2 Department of Instrumentation and Control Engineering, Sri Krishna College of Technology, Coimbatore 641 042, IN
1 Department of Electrical and Electronics Engineering, Anna University, Regional Campus, Coimbatore 641 046, IN
2 Department of Instrumentation and Control Engineering, Sri Krishna College of Technology, Coimbatore 641 042, IN
Source
Current Science, Vol 118, No 1 (2020), Pagination: 29-33Abstract
Transformers play an important role in transmission and distribution systems. Even to this day, 75% of high-voltage transformer failure is the outcome of improper dielectric insulation. The reliable operation and ageing characteristics of the transformers mainly depend on the insulation material. Mineral oil has been used as an insulation and coolant for almost a century in power transformers. Due to the development of extra high voltage and to cope with the increasing demand in voltage level, a nanofluids-based transformer oil is proposed here. In this work, nanoparticles such as aluminium oxide, molybdenum disulphide and titanium dioxide are used with transformer oil to analyse the various critical characteristics like dielectric strength, acidity, interfacial tension, viscosity, flash point and fire point of the power transformer. The observed results show that the proposed nanofluids-based transformer oil provides better performance than the normal transformer oil.Full Text
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- Al2O3-coated Fe3O4/graphene/TiO2 Hybrid Nanocomposite Mixture as Anode Material for Lithium-ion Batteries
Abstract Views :223 |
PDF Views:95
Authors
Affiliations
1 Department of Instrumentation and Control Engineering, Sri Krishna College of Technology, Coimbatore 641 042, IN
2 Department of Biomedical Engineering, Karunya Institute of Technology, Coimbatore 641 114, IN
3 Department of Engineering Design, Indian Institute of Technology Madras, Chennai 600 036, IN
1 Department of Instrumentation and Control Engineering, Sri Krishna College of Technology, Coimbatore 641 042, IN
2 Department of Biomedical Engineering, Karunya Institute of Technology, Coimbatore 641 114, IN
3 Department of Engineering Design, Indian Institute of Technology Madras, Chennai 600 036, IN
Source
Current Science, Vol 123, No 2 (2022), Pagination: 177-183Abstract
Lithium-ion batteries are efficient energy storage devices in electric vehicles (EVs). Graphite is used in these batteries as an anode material because of its high stability and good conductivity. However, the need for stability, safety and reversibility is increasing rapidly in commercial EVs. In this study, a Fe<sub>3</sub>O<sub>4</sub>/TiO<sub>2</sub>/gra-phene hybrid nanocomposite coated with Al<sub>2</sub>O<sub>3</sub> has been developed using the microwave-assisted hydro-thermal process with graphite as the anode material for lithium-ion batteries. This combination of nano-materials increases the stability of the anode, electrical conductivity and electrochemical performance. The Fe<sub>3</sub>O<sub>4</sub>/graphene/TiO<sub>2</sub> nanocomposite results in a rever-sible capacity of 920 mAh g–1 after analysing it in 160 cycles at a current density of 100 mAh g–1. The nano-composite provides excellent long-term cycle stability of 650 mAh g–1 after 160 cycles. This shows an ultra-high rate capability of 475 mAh g–1 at 150°C. The gra-phene and Fe<sub>3</sub>O<sub>4</sub>/graphene/TiO<sub>2</sub>hybrid nanocomposite mixture coated with Al<sub>2</sub>O<sub>3</sub> exhibits good nonlinear cumulative effects, stability, high reversibility, and in-creased ultrahigh rate capability.Keywords
Electric Vehicles, Graphite Anode, Hybrid Nanocomposite, Lithium-ion Batteries, Microwave-assisted Hydrothermal ProcessFull Text
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