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Co-Authors
- B. Karthick
- A. Senthil Kumar
- D. Vimal Raj
- Binita Pathak
- Pradip Kumar Bhuyan
- Arshini Saikia
- Kalyan Bhuyan
- Sankar Jyoti Nath
- Shyam Lochan Bora
- Mukunda M. Gogoi
- S. Suresh Babu
- B. S. Arun
- K. Krishna Moorthy
- A. Ajay
- Arun Suryavanshi
- Arup Borgohain
- Anirban Guha
- Atiba Shaikh
- Biswadip Gharai
- Boopathy Ramasamy
- G. Balakrishnaiah
- Harilal B. Menon
- Jagdish Chandra Kuniyal
- Jayabala Krishnan
- K. Rama Gopal
- M. Maheswari
- Manish Naja
- Parminder Kaur
- Pradip K. Bhuyan
- Pratima Gupta
- Prayagraj Singh
- Priyanka Srivastava
- R. S. Singh
- Ranjit Kumar
- Shantanu Rastogi
- Shyam Sundar Kundu
- Sobhan Kumar Kompalli
- Subhasmita Panda
- Tandule Chakradhar Rao
- Trupti Das
- Yogesh Kant
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Ajay, P.
- Mitigation of Power Quality Problems Using Series Active Power Filter Strategy for Three Phase Three Wire Distribution Systems
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Authors
Affiliations
1 Department of Electrical Drives and Control, Pondicherry Engineering College, Puducherry-605014, IN
2 Department of Electrical and Electronics Engineering, Pondicherry Engineering College, Puducherry-605014, IN
3 Department of Electrical and Electronics Engg., Pondicherry Engineering College, Puducherry-605014, IN
1 Department of Electrical Drives and Control, Pondicherry Engineering College, Puducherry-605014, IN
2 Department of Electrical and Electronics Engineering, Pondicherry Engineering College, Puducherry-605014, IN
3 Department of Electrical and Electronics Engg., Pondicherry Engineering College, Puducherry-605014, IN
Source
Programmable Device Circuits and Systems, Vol 5, No 8 (2013), Pagination: 337-341Abstract
This paper investigates the performance of series active power filter strategy for compensating source voltage disturbances occurring in a power distribution system. The SAPF (series active power filter) is configured from three phase voltage source inverter with DC link capacitor. The control strategy is based on the dual formulation instantaneous reactive power for extracting reference signals for compensating the PQ (power quality) problems. Simulations have carried out on the MATLAB-Simulink platform with different operating conditions, which enhances the effectiveness of the topology of series active power filter for voltage profile improvement. Experimental and Simulation results are presented.Keywords
Active Power Filters, Power Quality, Harmonics, Dual Formulation Instantaneous Reactive Power Theory.- Impact of Lockdown Due to COVID-19 Outbreak on O3 and its Precursor Gases, PM and BC Over Northeast India
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PDF Views:89
Authors
Binita Pathak
1,
Pradip Kumar Bhuyan
2,
Arshini Saikia
2,
Kalyan Bhuyan
1,
P. Ajay
2,
Sankar Jyoti Nath
2,
Shyam Lochan Bora
1
Affiliations
1 Department of Physics, Dibrugarh University, Dibrugarh 786 004, IN
2 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
1 Department of Physics, Dibrugarh University, Dibrugarh 786 004, IN
2 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 322-331Abstract
Copernicus Atmosphere Monitoring Service (CAMS) data are used to evaluate the impact of the lockdown (24 March–3 May 2020) on the concentrations of surface O3, NOx, CO, SO2, PM and BC compared to those measured during the same period in 2015–2019 over northeast India and adjoining areas. Measurements made at Dibrugarh complements the CAMS observations. The NOx, NO2, CO, SO2, BC and PM concentrations dipped appreciably over northeast India and nearby countries. Similar decrement is observed in Dibrugarh in 2020 over their reference levels. Reduction of precursor gases triggered an increase in O3 concentration across northeast India and adjoining South Asia and at Dibrugarh. The air quality over the region improved from moderate to satisfactory levels due to the lockdown.Keywords
Aerosols, Air Quality, COVID-19, Lockdown, Northeast India, Particulate Matter, Trace Gases.References
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- Bauwens, M. et al., Impact of coronavirus outbreak on NO2 pollution assessed using TROPOMI and OMI observations. Geophys. Res. Lett., 2020; doi:10.1029/2020GL087978.
- Sharma, S., Zhang, M., Gao, J., Zhang, H. and Kota, S. H., Effect of restricted emissions during COVID-19 on air quality in India. Sci. Total Environ., 2020, 728, 138878.
- Mahato, S., Pal, S. and Ghosh, K. G., Effect of lockdown amid COVID-19 pandemic on air quality of the megacity Delhi, India. Sci. Total Environ., 2020, 730, 139086.
- Pathak, B., Bhuyan, P. K., Biswas, J. and Takemura, T., Long term climatology of particulate matter and associated microphysical and optical properties over Dibrugarh, North-East India and inter-comparison with SPRINTARS simulations. Atmos. Environ., 2013, 69, 334–344.
- Pathak, B. and Bhuyan, P. K., Absorbing and scattering properties of boundary layer aerosols over Dibrugarh, Northeast India. Int. J. Remote Sensing, 2014, 35(14), 5527–5543.
- Bhuyan, P. K., Bharali, C., Pathak, B. and Kalita, G., The role of precursor gases and meteorology on temporal evolution of O3 at a tropical location in North East India. Environ. Sci. Poll. Res., 2014, 1–18; doi:10.1007/s11356-014-2587-3.
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- Pathak, B., Bhuyan, P. K., Gogoi, M. M. and Bhuyan, K., Seasonal heterogeneity in aerosol types over Dibrugarh, North-Eastern India. Atmos. Environ., 2012, 47, 307–315; doi:10.1016/ j.atmosenv.2011.10.061.
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- Saikia, A., Pathak, B., Singh, P., Bhuyan, P. K. and Adhikary, B., Multi-model evaluation of meteorological drivers, air pollutants and quantification of emission sources over the Upper Brahmaputra basin. Atmosphere, 2019, 10(11), 703.
- Dahutia, P., Pathak, B. and Bhuyan, P. K., Aerosols characteristics, trends and their climatic implications over Northeast India and adjoining South Asia. Int. J. Climatol., 2018, 38, 1234–1256.
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- Control of Urban Pollution Series: CUPS/82/2014-15.
- Response of Ambient BC Concentration Across the Indian Region to the Nation-Wide Lockdown: Results from the ARFINET Measurements of ISRO-GBP
Abstract Views :293 |
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Authors
Mukunda M. Gogoi
1,
S. Suresh Babu
1,
B. S. Arun
1,
K. Krishna Moorthy
2,
A. Ajay
3,
P. Ajay
4,
Arun Suryavanshi
5,
Arup Borgohain
6,
Anirban Guha
7,
Atiba Shaikh
8,
Binita Pathak
4,
Biswadip Gharai
9,
Boopathy Ramasamy
10,
G. Balakrishnaiah
11,
Harilal B. Menon
8,
Jagdish Chandra Kuniyal
12,
Jayabala Krishnan
13,
K. Rama Gopal
11,
M. Maheswari
13,
Manish Naja
14,
Parminder Kaur
7,
Pradip K. Bhuyan
4,
Pratima Gupta
15,
Prayagraj Singh
16,
Priyanka Srivastava
14,
R. S. Singh
17,
Ranjit Kumar
15,
Shantanu Rastogi
16,
Shyam Sundar Kundu
6,
Sobhan Kumar Kompalli
1,
Subhasmita Panda
10,
Tandule Chakradhar Rao
11,
Trupti Das
10,
Yogesh Kant
18
Affiliations
1 Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
4 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
5 Regional Remote Sensing Centre, Indian Space Research Organisation, Nagpur 440 033, IN
6 North Eastern – Space Application Centres, Shillong 793 103, IN
7 Department of Physics, Tripura University, Suryamaninagar, Agartala 799 022, IN
8 Department of Marine Sciences, Goa University, Goa 403 206, IN
9 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, IN
10 Indian Institute of Mineral and Materials Technology, Bhubaneswar 751 013, IN
11 Sri Krishna Devaraya University, Anantapur 515 003, IN
12 G. B. Pant Institute of Himalayan Environment and Development, Kullu 175 126, IN
13 Tamil Nadu Agricultural University, Coimbatore 641 003, IN
14 Aryabhatta Research Institute of Observational Sciences, Nainital 263 002, IN
15 Department of Chemistry, Dayalbagh Educational Institute, Agra 282 005, IN
16 Department of Physics, D.D.U. Gorakhpur University, Gorakhpur 273 009, IN
17 Department of Chemical Engineering, IIT-BHU, Varanasi 221 005, IN
18 Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, IN
1 Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, IN
2 Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bengaluru 560 012, IN
3 Divecha Centre for Climate Change, Indian Institute of Science, Bengaluru 560 012, IN
4 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
5 Regional Remote Sensing Centre, Indian Space Research Organisation, Nagpur 440 033, IN
6 North Eastern – Space Application Centres, Shillong 793 103, IN
7 Department of Physics, Tripura University, Suryamaninagar, Agartala 799 022, IN
8 Department of Marine Sciences, Goa University, Goa 403 206, IN
9 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, IN
10 Indian Institute of Mineral and Materials Technology, Bhubaneswar 751 013, IN
11 Sri Krishna Devaraya University, Anantapur 515 003, IN
12 G. B. Pant Institute of Himalayan Environment and Development, Kullu 175 126, IN
13 Tamil Nadu Agricultural University, Coimbatore 641 003, IN
14 Aryabhatta Research Institute of Observational Sciences, Nainital 263 002, IN
15 Department of Chemistry, Dayalbagh Educational Institute, Agra 282 005, IN
16 Department of Physics, D.D.U. Gorakhpur University, Gorakhpur 273 009, IN
17 Department of Chemical Engineering, IIT-BHU, Varanasi 221 005, IN
18 Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 341-351Abstract
In this study, we assess the response of ambient aero-sol black carbon (BC) mass concentrations and spec-tral absorption properties across Indian mainland during the nation-wide lockdown (LD) in connection with the Coronavirus Disease 19 (COVID-19) pan-demic. The LD had brought near to total cut-off of emissions from industrial, traffic (road, railways, ma-rine and air) and energy sectors, though the domestic emissions remained fairly unaltered. This provided a unique opportunity to delineate the impact of fossil fuel combustion sources on atmospheric BC characte-ristics. In this context, the primary data of BC meas-ured at the national network of aerosol observatories (ARFINET) under ISRO-GBP are examined to assess the response to the seizure of emissions over distinct geographic parts of the country. Results indicate that average BC concentrations over the Indian mainland are curbed down significantly (10–40%) from pre-lockdown observations during the first and most in-tense phase of lockdown. This decline is significant with respect to the long-term (2015–2019) averaged (climatological mean) values. The drop in BC is most pronounced over the Indo-Gangetic Plain (>60%) and north-eastern India (>30%) during the second phase of lockdown, while significant reduction is seen during LD1 (16–60%) over central and peninsular Indian as well as Himalayan and sub-Himalayan regions. De-spite such a large reduction, the absolute magnitude of BC remained higher over the IGP and north-eastern sites compared to other parts of India. Notably, the spectral absorption index of aerosols changed very little over most of the locations, indicating the still persisting contribution of fossil-fuel emissions over most of the locations.Keywords
ARFINET, Black Carbon, COVID-19.References
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