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Rao, A. R.
- Annual Review of Astronomy and Astrophysics
Abstract Views :210 |
PDF Views:94
Authors
Affiliations
1 Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, IN
1 Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400 005, IN
Source
Current Science, Vol 109, No 4 (2015), Pagination: 808-809Abstract
No Abstract.Full Text
- Cadmium-Zinc-Telluride Imager On-Board Astrosat:A Multi-Faceted Hard X-Ray Instrument
Abstract Views :233 |
PDF Views:87
Authors
Affiliations
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
2 Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, IN
3 Physical Research Laboratory, Ahmedabad 380 009, IN
4 Vikram Sarabhai Space Centre, Thiruvananthapuram 695 024, IN
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
2 Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, IN
3 Physical Research Laboratory, Ahmedabad 380 009, IN
4 Vikram Sarabhai Space Centre, Thiruvananthapuram 695 024, IN
Source
Current Science, Vol 113, No 04 (2017), Pagination: 595-598Abstract
The AstroSat satellite is designed to make multi-waveband observations of astronomical sources and the Cadmium-Zinc-Telluride Imager (CZTI) instrument of AstroSat covers the hard X-ray band. CZTI has a large area position-sensitive hard X-ray detector equipped with a coded aperture mask, thus enabling simultaneous background measurements. Ability to record simultaneous detection of ionizing interactions in multiple detector elements is a special feature of the instrument, and this is exploited to provide polarization information in the 100-380 keV region. CZTI provides sensitive spectroscopic measurements in the 20-100 keV region, and acts as an all-sky hard X-ray monitor and polarimeter above 100 keV. During the first year of operation, CZTI has recorded several gamma-ray bursts, measured the phase-resolved hard X-ray polarization of the Crab pulsar, and the hard X-ray spectra of many bright galactic X-ray binaries. The excellent timing capability of the instrument has been demonstrated with simultaneous observation of the Crab pulsar with radio telescopes like Gaint Metrewave Radio Telescope and Ooty Radio Telescope.Keywords
All-Sky Hard X-Ray Monitor, Gamma-Ray Bursts, Neutron Stars, X-Ray Polarization.Full Text
References
- Singh, K. P. et al., AstroSat mission. In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series: Space Telescopes and Instrumentation 2014: UV to Gamma Ray, at Montreal, 2014, vol. 9144, 91441S (p. 15).
- Bhalerao, V. et al., The Cadmium–Zinc–Telluride Imager on AstroSat. JAA, 2017, 38, 31.
- Bhalerao, V., Bhattacharya, D., Rao, A. R. and Vadawale, S., GRB151006A: AstroSat CZTI detection. GRB Coordinates Network, 2015, 18422, 1.
- Rao, A. R. et al., AstroSat CZT Imager observations of GRB151006A: timing, spectroscopy, and polarization study. ApJ, 2016, 833, 86.
- Bhalerao, V. et al., LIGO/Virgo G211117: AstroSat CZTI upper limits. GRB Coordinates Network, 2016, 19401, 1.
- Bhalerao, V., Bhattacharya, D., Rao, A. R. and Vadawale, S., GRB170105A: AstroSat CZTI localisation. GRB Coordinates Network, 2016, 20412, 1.
- Chattopadhyay, T., Vadawale, S. V., Rao, A. R., Sreekumar, S., and Bhattacharya, D., Prospects of hard X-ray polarimetry with AstroSat–CZTI. Exp. Astron., 2014, 37, 555.
- Vadawale, S. V. et al., Hard X-ray polarimetry with AstroSat–CZTI. Astron. Astrophys., 2015, 578, A73.
- Buhler, R. and Blandford, R., The surprising Crab pulsar and its nebula: a review. Rep. Prog. Phys., 2014, 77(6), 066901.
- Lyne, A. G., Pritchard, R. S. and Graham-Smith, F., Twenty-three years of Crab pulsar rotational history. MNRAS, 1993, 265, 1003.
- Wheat Production Functions Under Irrigated Saline Environment and Foliar Potassium Fertigation
Abstract Views :239 |
PDF Views:77
Authors
Affiliations
1 Irrigation and Drainage Engineering Division, ICAR-Central Institute of Agricultural Engineering, Bhopal 462 038, IN
2 Water Technology Centre, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, IN
3 ICAR-Indian Agricultural Statistics Research Institute, New Delhi 110 012, IN
1 Irrigation and Drainage Engineering Division, ICAR-Central Institute of Agricultural Engineering, Bhopal 462 038, IN
2 Water Technology Centre, ICAR-Indian Agricultural Research Institute, New Delhi 110 012, IN
3 ICAR-Indian Agricultural Statistics Research Institute, New Delhi 110 012, IN
Source
Current Science, Vol 118, No 12 (2020), Pagination: 1939-1945Abstract
A field experiment was conducted for two consecutive years to develop management alternatives for wheat cultivars (salt-tolerant and salt non-tolerant) cultivated under irrigated saline environment (groundwater, 4, 8 and 12 dS m–1) and foliar potassium fertigation. The grain yield of wheat cultivars decreased with the increase in salinity levels of irrigation water. The foliar potassium fertigation during the heading stage of wheat cultivars ameliorated the adverse effect of salinity and resulted in the increase in grain yield. In this study, empirical equations for wheat yield known as production function have been developed. The production functions were developed keeping grain yield parameter as output, besides the many input parameters pertaining to quantity and quality of the irrigation water, quantity of potassium applied as foliar spray and rainfall depth during the crop growth period. The production function with higher coefficient of determination (R2) may be used to predict grain yield of both salt-tolerant and salt non-tolerant cultivars under different saline irrigation regimes, rainfall and irrigation water depths, besides the dose of potassium sulphate (K2SO4) for foliar spray. The production function which gave the highest R2 value (i.e. 0.82 for KRL-1-4 and 0.97 for HD 2894 wheat cultivars) could be used for foliar spray under different salinity regimes with high expectation of grain yield. The predicted grain yield and estimated quantity of potassium under different salinity levels of irrigation water may prove useful to different stakeholders for enhancing the wheat yield in high saline water areas. The stakeholders can predict the grain yield under similar circumstances as explained in this experiment and estimate the appropriate potassium doses to be applied for enhancing the wheat yield.Keywords
Foliar Potassium Fertigation, Irrigation Water, Production Function, Salt-Tolerant Cultivar, Wheat Yield.Full Text
References
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