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Kumar, Pradeep
- Indigenous Development of a Millikelvin Refrigerator at VECC, Kolkata
Abstract Views :193 |
PDF Views:73
Authors
Nisith Kr. Das
1,
Jedidiah Pradhan
1,
Bidhan Ch. Mondal
1,
Anindya Roy
1,
Z. A. Naser
1,
Pradeep Kumar
1
Affiliations
1 Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064, IN
1 Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064, IN
Source
Current Science, Vol 112, No 05 (2017), Pagination: 1023-1028Abstract
Technologies related to production of millikelvin temperature have been developed and tested in the laboratory. All the critical components were assembled to make a complete dilution refrigerator. The refrigerator was successfully run and commissioned in VECC. The system involves several advanced cryogenic concepts especially the capillary impedance and heat exchanger. A temperature to the tune of 50 mK has been achieved. This is the first development of its kind in India, and likely to usher a new wave in the research arena of advanced cryogenics.Keywords
Evaporator, Mixing Chamber, Millikelvin, 3He–4He Mixture.Full Text
- Estimation of Pyrogenic Carbon Emissions from Forests of Sikkim Himalaya, India:A Geoinformatics Approach
Abstract Views :241 |
PDF Views:91
Authors
Pradeep Kumar
1,
M. K. Ghose
2
Affiliations
1 Forests, Environment and Wildlife Management Department, Government of Sikkim, Deorali, Gangtok 737 102, IN
2 Sikkim Manipal University, Gangtok 737 102, IN
1 Forests, Environment and Wildlife Management Department, Government of Sikkim, Deorali, Gangtok 737 102, IN
2 Sikkim Manipal University, Gangtok 737 102, IN
Source
Current Science, Vol 112, No 09 (2017), Pagination: 1864-1872Abstract
With a view to understanding the micro-level mechanisms and lay the future path for improved carbon emission estimations from forest fires, we estimate fire emissions in Sikkim Himalaya, India. Remote sensing and geographical information system were used for fire scar identification, by mapping the multiple strata-based carbon density and partitioning the forest carbon into multiple pools. Fraction of carbon consumed in fire was further partitioned into the processes of flaming and smouldering. The estimation of trace gases of carbon dioxide, carbon monoxide and methane was made accordingly.Keywords
Carbon Emissions, Forest Fire, Geoinformatics Approach, Remote Sensing.Full Text
References
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- Numerical Studies of Ventilation Effect on Methane Layering Behaviour in Underground Coal Mines
Abstract Views :284 |
PDF Views:101
Authors
Affiliations
1 Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
1 Department of Mining Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
Source
Current Science, Vol 112, No 09 (2017), Pagination: 1873-1881Abstract
Layering of methane in underground coal mines owing to poor ventilation leads to methane explosion hazard. We study the methane layering phenomenon and the effect of ventilation on dispersion of methane in underground coal mines at air velocities varying from 0.5 to 4.0 m/s. Three-dimensional simulations using CFD code ANSYS Fluent 12.0 were performed assuming the flow to be unsteady, turbulent and incompressible. The study demonstrated that ventilation significantly affects the behaviour of methane layering and dispersion of methane in underground coal mines. The layering length decreased with increase in air velocity. At air velocity of 4.0 m/s, the methane layering length considerably reduced to a safer level of about 1 m. Moreover, the simulation results showed a good agreement with the experimental results.Keywords
Methane Layering, Numerical Simulation, Underground Coal Mine, Ventilation Effect.Full Text
References
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- Remote Sensing-Derived Spectral Vegetation Indices and Forest Carbon:Testing the Validity of Models in Mountainous Terrain Covered with High Biodiversity
Abstract Views :250 |
PDF Views:73
Authors
Pradeep Kumar
1,
M. K. Ghose
2
Affiliations
1 Forests, Environment and Wildlife Management Department, Government of Sikkim, Gangtok 737 102, IN
2 Sikkim Manipal University, Gangtok 737 102, IN
1 Forests, Environment and Wildlife Management Department, Government of Sikkim, Gangtok 737 102, IN
2 Sikkim Manipal University, Gangtok 737 102, IN
Source
Current Science, Vol 112, No 10 (2017), Pagination: 2043-2050Abstract
Sequestration of carbon through forests is an important aspect in global climate change mitigation. Assessment of carbon in forests using remote sensing and GIS tools is one of the most important aspects of rapid and verifiable methodologies. A number of studies have shown the utility of spectral (vegetation) indices like NDVI in the assessment of forest carbon. However, there are limitations to this approach. The mountainous topography and high biodiversity affect the spectral values in pixels in multiple ways. The present article aims to test the validity of use of vegetation indices in high-biodiversity forests in mountains by modelling the ground based forest carbon measurement with vegetation indices of NDVI, EVI, SAVI and MSAVI in a multi-sensor, multi-season data environment with multiple regression methods like linear, power, logarithmic, polynomial and exponential. It is found that all the regressions have a poor coefficient of determination not even exceeding 0.2. It is concluded that the remote sensing-based spectral vegetation indices alone cannot be a proxy for forest carbon calculators in high biodiversity mountain forests.Keywords
Biodiversity, Forest Carbon, Mountain, Remote Sensing, Vegetation Indices.Full Text
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