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21.
Santabrata Das Sandip K. Chakrabarti 《Monthly notices of the Royal Astronomical Society》2008,389(1):371-378
We study the dynamical structure of a cooling dominated rotating accretion flow around a spinning black hole. We show that non-linear phenomena such as shock waves can be studied in terms of only three flow parameters, namely the specific energy , the specific angular momentum (λ) and the accretion rate of the flow. We present all possible accretion solutions. We find that a significant region of the parameter space in the plane allows global accretion shock solutions. The effective area of the parameter space for which the Rankine–Hugoniot shocks are possible is maximum when the flow is dissipation-free. It decreases with the increase of cooling effects and finally disappears when the cooling is high enough. We show that shock forms further away when the black hole is rotating compared to the solution around a Schwarzschild black hole with identical flow parameters at a large distance. However, in a normalized sense, the flow parameters for which the shocks form around the rotating black holes are produced shocks closer to the black hole. The location of the shock is also dictated by the cooling efficiency in that higher the accretion rate , the closer is the shock location. We believe that some of the high-frequency quasi-periodic oscillations may be due to the flows with higher accretion rate around the rotating black holes. 相似文献
22.
Regional scale urban built-up areas and surface urban heat islands (SUHI) are important for urban planning and policy formation. Owing to coarse spatial resolution (1000 m), it is difficult to use Moderate Resolution Imaging Spectroradiometer (MODIS) Land surface temperature (LST) products for mapping urban areas and visualization, and SUHI-related studies. To overcome this problem, the present study downscaled MODIS (1000 m resolution)-derived LST to 250 m resolution to map and visualize the urban areas and identify the basic components of SUHI over 12 districts of Punjab, India. The results are compared through visual interpretation and statistical procedure based on similarity analysis. The increased entropy value in the downscaled LST signifies higher information content. The temperature variation within the built-up and its environs is due to difference in land use and is depicted better in the downscaled LST. The SUHI intensity analysis of four cities (Ludhiana, Patiala, Moga and Vatinda) indicates that mean temperature in urban built-up core is higher (38.87 °C) as compared to suburban (35.85 °C) and rural (32.41 °C) areas. The downscaling techniques demonstrated in this paper enhance the usage of open-source wide swath MODIS LST for continuous monitoring of SUHI and urban area mapping, visualisation and analysis at regional scale. Such initiatives are useful for the scientific community and the decision-makers. 相似文献
23.
Sandip R. Oza R. K. K. Singh N. K. Vyas B. S. Gohil Abhijit Sarkar 《Journal of the Indian Society of Remote Sensing》2011,39(2):147-152
The identification of sea-ice has frequently been cited as one of the most important tasks for deriving the sea-ice parameters
and to avoid erroneous retrieval of wind vector over sea-ice infested oceans using space-borne scatterometer data. Discrimination
between sea-ice and ocean is ambiguous under the high wind and/or thin/scattered ice conditions. The pre-launch technique
developed for Oceansat-2, utilizes the dual-polarized QuikSCAT scatterometer data by using the spatio-temporal coherence properties
of sea ice in addition to backscatter coefficient and the Active Polarization Ratio. Results were compared with the operational
sea-ice products from National Snow and Ice Data Center. The threshold API value of −0.025 was found optimum for sea-ice and
ocean discrimination. The overall sea-ice identification accuracy achieved was of the order of 95 per cent, ranging from 92.5%
(during December in Southern Hemisphere) to 98% (during March in Northern Hemisphere). The applicability of the algorithm
for both the Arctic as well as Antarctic makes it suitable for its operational use with the Oceansat-2 scatterometer data. 相似文献
24.
Prakash Kumar Shrivastava Rajesh Asthana Sandip Kumar Roy 《Journal of the Geological Society of India》2011,78(2):117-123
Recession of the snout of Dakshin Gangotri glacier in the western part of Schirmacher Oasis, East Antarctica has been recorded
over two decades. However, the rate of retreat is not uniform and varies at different locations. The ice wall forming the
western flank of the glacier has shown an average retreat of 17.07 m between 2001 and 2009 while the snout had gone back by
6.94 m (average) during the same period. Before 2001, the snout had shown a complete recession of 3.13 m (average). The snout
occupies valley area receiving less amount of solar radiation as compared to the western wall, which is a vertical cliff receiving
maximum amount of solar radiation. The notable difference in the rate of recession in different parts of the Dakshin Gangotri
glacier overriding Schirmacher Oasis can be attributed to combined effect of natural factors, including meteorological parameters,
ice sheet dynamics and geomorphology of that area. 相似文献
25.
Biswajit Ghosh Sandip Some Animesh Thakur 《Journal of the Geological Society of India》2011,78(4):365-369
Zincian spinels (gahnites) from the Mamandur Zn-Pb-Cu prospect of the Southern Granulite Terrain have been studied. Gahnites
in the quartzofeldspathic gneiss occur either as (a) porphyroblastic grains closely in association with cordierite and sphalerite
or as (b) inclusions in poikiloblastic quartz grains, restricted within quartz veinlets. Compositionally these gahnites belong
to two different clusters corresponding to two modes of occurrences. The origin of the porphyroblastic gahnites is linked
with the process of desulphidation of sphalerite whereas those occurring as inclusions within poikiloblastic quartz are direct
crystallisation products from silica rich hydrothermal solution. A new compositional field for this latter group of gahnites
is proposed here. 相似文献
26.
Spectral and timing properties of accretion flows on a black hole depend on their density and temperature distributions,which in turn come from the underlying d... 相似文献
27.
We study the effects of incorporating magnetic buoyancy in a model of the solar dynamo—which draws inspiration
from the Babcock-Leighton idea of surface processes generating the poloidal field. We present our main results here. 相似文献
28.
Sandip K. Chakrabarti 《Journal of Astrophysics and Astronomy》1988,9(4):243-248
We study numerically the motion of a single particle in the bending wave of finite thickness in Saturn’s ring. We include
the forcing due to the planet, a moon, the coriolis force and the self gravity of the ring. In particular, we compute the
variation of the velocity arising due to the variation of the amplitude and the phase of the epicyclic motion across the local
vertical height of the ring. We suggest that the dissipation of energy due to the collision of ring particles in this shear
layer damps out the bending wave of Saturn’s ring at the 5:3 vertical resonance of Mimas within a distance of 150 km from
the site of its launching as is observed in Voyager data. 相似文献
29.
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