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Journals
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Srivastava, V. K.
- Significance of Tree Crown Diameter in Forest Mensuration
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Indian Forester, Vol 124, No 12 (1998), Pagination: 1001-1009Abstract
Mean crown diameter showed significant correlation with mean tree volume in man-made (Teak and Sal) and natural (dry and moist deciduous) forests. The value of correlation coefficient ("r") between mean crown diameter and mean tree volume was close to the value of "r" between DBH and mean tree volume. Regression equations were also developed and the predictive performance of the equations evaluated. It was concluded that mean crown diameter may be used to estimate mean tree vol ume in the above type of forests, as the growth of the tree is also reflected in the growth of the crown spread. Hence, it may be a good measure to estimate tree volume. It is therefore suggested that mean crown diameter may also be considered an important parameter in forest mensuration.
- Studies on Growth Correlations in Pinus rlliottii
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Indian Forester, Vol 110, No 3 (1984), Pagination: 269-273Abstract
Investigations on growth analysis in Pinus elliottii, which has high rate of productions revealed that there is a close correlation between total biomass, leaf area as well as leaf efficiency. The results suggest that during early stages canopy growth is vertical and subsequently horizontal. The leaf efficiency though increases with age, the rate of increase declines with age. Net assimilation rate shows a fluctuating trend and the mean NAR is much higher when compared to other conifers which explains the higher turnover of dry matter in this species.- Biomass Production in an Age Series of Pinus patula Plantation in Tamil Nadu
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Indian Forester, Vol 110, No 9 (1984), Pagination: 915-930Abstract
Distribution of organic matter in differenf tree components of 3,5,9, 11 and 13 years old plantations of Pinus patula has heen discussed. The total biomass ranges from 7 tonnes (3 years) to 194 tonnes (9 years) per ha with 82 to 87 per cent being contributed by the aboveground parts and 13 to 18 per cent by ischolar_main.- Distribution of Organic Matter in Pinus elliottii Plantations
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Indian Forester, Vol 108, No 1 (1982), Pagination: 39-50Abstract
The distribution of organic matter in various tree components for 10, 20, 30 and 40 years old plantations of Pinus elliottii has been discussed. The total biomass ranges from about 169 tonnes (10 years) to 529 tonnes (40 years) per ha with 81 to 85 per cent being contributed by the above-ground parts and 19 to 15 per cent by the ischolar_mains.- Intracranial Tumours in Childhood - A Follow-up Study
Abstract Views :192 |
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Source
NIMHANS Journal, Vol 4, No 1 (1986), Pagination: 33-42Abstract
One hundred histologically confirmed intracranial neoplastic lesions in children under twelve has been analysed retrospectively. They constitute 13.4 % of all intracranial neoplastic lesions operated in this Institute from 1975 to 1980. The data is generally consistent with other reported large series. The maximum age incidence is between 5 and 12 years. Gliomas are the commonest tumour. The high grade gliomas tend to occur more frequently during the first quinquennium of life. Certain unusual presentations like fever, focal seizures in posterior fossa lesions and limb ataxia in supratentorial tumours have been emphasized. The mortality in relation to clinical presentation is discussed.Keywords
Paediatric Neoplasia, Tumours of Brain- Pebble Fabric Analysis of the Talchir Boulder Bed in the Jharia Coalfield, Bihar
Abstract Views :338 |
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Authors
Affiliations
1 Department of Geology, University of Aligarh, IN
1 Department of Geology, University of Aligarh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 1 (1959), Pagination: 105-115Abstract
The Talchir boulder bed in the Jharia Coalfield, has been studied with special reference to the fabric of the particles that constitute it and an attempt has been made to determine the nature and direction of the depositing agency.
Studies on pebble orientation show that the particles are preferentially oriented in all the sections studied and exhibit an upstream imbrication. The inclination is of the same order of magnitude as determined by Cailleux for fluvial gravels.
The streams that deposited these ancient gravels came from a general westerly and north-westerly direction as shown by the fabric diagrams. It is inferred that the source of the debris was the moraine material left by melting glaciers and that the debris was transported east and south-eastwards by fast flowing streams into the basin of deposition.
- Evolution of Pre-Siwalik Tertiary Basin of Himachal Himalaya
Abstract Views :162 |
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Authors
Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh 202001, IN
1 Department of Geology, Aligarh Muslim University, Aligarh 202001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 3 (1983), Pagination: 134-147Abstract
The Subathu, Dagshai and Kasauli rocks of Himachal sub Himalaya have been classically interpreted as of marine brackish or lagoonal origin. In this study, the pre-Siwalik Tertiary rocks of southern Himachal Pradesh are grouped into five distinct lithofacies, which collectively represent a consanguineous association of sediments deposited in related geomorphic environments: 1. Fossiliferous green shale, locally red, with lenses of limestone interpreted as tidally influenced shelf deposits; 2. Clean white sandstone interpreted as coastal barrier bars; 3. Red mudstone locally green, and lenses of grey sandstone with channel lag interpreted as lagoonal and tidal flat deposits; 4. Grey sandstone with channel lag and red mudstone and siltstone inferred to have accumulated in distributary channel and inter-distributary plains of fluvio-delta complex; 5. Grey, white sandstone and mudstone interpreted as a mixed assemblage of fluvio-delta and coastal barrier facies.
Two systems of currents operated during the deposition of these rocks: one, across the delta plain complex was directed towards south and southwest following the prevailing regional paleoslope; and the other representing longshore currents in adjacent coastal areas operating parallel to shoreline, was directed towards west-northwest.
- Trimethoprim-Sulphamethoxazole in the Treatment of Urinary Infections
Abstract Views :168 |
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Authors
Affiliations
1 King George's Medical College, Lucknow, IN
1 King George's Medical College, Lucknow, IN
Source
The Indian Practitioner, Vol 32, No 7 (1979), Pagination: 399-406Abstract
No Abstract.- Source Parameters and Focal Mechanisms of Local Earthquakes: Single Broadband Observatory at ISM Dhanbad
Abstract Views :195 |
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Authors
Affiliations
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, IN
2 Department Geology and Geophysics, IIT Kharagpur, Kharagpur - 721 302, IN
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, IN
2 Department Geology and Geophysics, IIT Kharagpur, Kharagpur - 721 302, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 3 (2009), Pagination: 413-419Abstract
A three-component broadband seismograph is in operation since January 2007 at the Indian School of Mines (ISM) campus. We have used the broadband seismograms of two local earthquakes M <3 recorded by this single station to illustrate its efficacy in understanding the source processes and tectonics in Dhanbad area. Source parameters and fault plane solutions are obtained through waveform inversion. It is observed that these two earthquakes occurred in the lower crust at a depth of 26 km by strike slip faulting. North-south compressional and east-west tensional stresses are dominant in the area, and the lower crust is the source area for the local earthquakes.Keywords
Earthquake, Broadband, Seismograph, Dhanbad.References
- BAUMBACH, M. and BORMANN, P. (2002) Determination of source parameters from seismic spectra. In: P. Bormann (Ed.), IASPEI manual of Seismological Observatory Practice. GFZ Publication.
- BHATTACHARYA, S.N. (1992) Generation of synthetic seismograms with layer reduction. Geophys. Jour. Internat., v.111, pp.79-90.
- BHATTACHARYA, S.N. and DATTATRAYAM, R.S. (2003) Some Characteristics of Recent Earthquake Sequences in Peninsular India. Gondwana Geol. Magz., v.5, pp.67-85.
- BHATTACHARYA, S.N., GHOSE, A.K., SURESH, G., BAIDYA, P.R. and SAXENA, R.C. (1997) Source parameters of Jabalpur earthquake of 22 May 1997. Curr. Sci., v.73, pp.855-863.
- BHATTACHARYA, S.N., SURESH, G. and MITRA, S. (2009) Lithospheric S-wave velocity structure of the Bastar craton, Indian peninsula from surface-wave phase-velocity measurements. Bull. Seism. Soc. Amer., v.99(4), (in press).
- CHANDRA, U. (1977) Earthquakes of Peninsular India- A seismotectonic study. Bull. Seism. Soc. Amer., v.67, pp.1387-1413.
- DREGER, D.S. and HELMBERGER, H.M. (1993) Determination of source parameters at regional distances with three-component sparse network data. Jour. Geophys. Res., v.98, pp.8107-8125..
- GUPTA, H.K. (2002) A review of recent studies of triggered earthquakes by artificial water reservoirs with special emphasis on earthquakes in Koyna, India. Earth Sci. Rev., v.58, pp.279-310.
- KANAMORI, H., MORIM, J. and HEATON, T.H. (1990) The 3 December 1988, Pasadena earthquake (ML = 4.9) recorded with very broadband system in Pasadena. Bull. Seism. Soc. Am., v.80, pp.483-4
- KAYAL, J.R. (2000) Seismotectonic study of the two recent SCR earthquakes in central India. Jour. Geol. Soc. India, v.55, pp.123-138.
- KAYAL, J.R. (2007) Recent large Earthquakes in India: Seismotectonic Perspective. IAGR Mem., no.10, pp.1-11.
- KAYAL, J. R., DE, R., SAGINA RAM, SRIRAMA, B.V. and GAONKAR, S.G. (2002) Aftershocks of the 26 January, 2001 Bhuj earthquake in western India and its seismotectonic implications. Jour. Geol. Soc. India, v.59, pp.395-417.
- KAYAL, J.R., AREFIEV, S.S., BARUAH, S., HAZARIKA, D., GOGOI, N., KUMAR, A., CHOWDHURY, S.N. and KALITA, S. (2006) Shillong Plateau earthquakes in northeast India region: Complex tectonic model. Curr. Sci., v.91(1), pp.109-114.
- KAYAL, J.R., SRIVASTAVA V.K. and KUMAR, PRAKASH (2009) Crustal discontinuities below the ISM Dhanbad Observatory: Receiver function analysis of the teleseismic events (in prep.).
- PINAR, A., KUGE, K. and HONKURA, Y. (2003) Moment-tensor inversion of recent small to moderate sized earthquakes: Implications for seismic hazard and active tectonics beneath the sea of Marmara, Geophys. Jour. Int., v.153, pp.133-145.
- RICHTER, C.F. (1958) Elementary Seismology (Appendix XII), W.H. Freeman, San Francisco.
- SHEARER, P.M. (1999) Introduction to Seismology, Cambridge University Press, 260p.
- WANG, R. (1999) A simple ortho-normalization method for stable and efficient computation of Green's function. Bull. Seism. Soc. Am., v.89, pp.733-741.
- ZAHRADNIK, J., JANSKY, J. and PLICKA, V. (2008) Detailed wave form inversion for moment tensor of M ~ 4 events: Examples from the Corinth Gulf, Greece. Bull. Seism. Soc. Am., v.98, No.6, pp.2756-2771.
- Evaluation of Crustal and Upper Mantle Structures Using Receiver Function Analysis: ISM Broadband Observatory Data
Abstract Views :204 |
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Authors
Affiliations
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, IN
2 National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN
1 Department of Applied Geophysics, Indian School of Mines, Dhanbad - 826 004, IN
2 National Geophysical Research Institute (Council of Scientific and Industrial Research), Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 1 (2011), Pagination: 76-80Abstract
A three-component broadband seismograph is in operation since January 2007 at the Indian School of Mines (ISM) campus, Dhanbad. We have used the broadband (BB) seismograms of 17 teleseismic events (M ≥ 5.8) recorded by this single BB station during 2008-09 to estimate the crust and upper mantle discontinuities in Dhanbad area which falls in the peninsular India shield. The converted wave technique and the Receiver function analysis are used. A 1-D velocity model has been derived using inversion. The Mohorovicic (Moho) discontinuity (crustal thickness) below the ISM observatory is estimated to be ~41 km, with an average Poisson ratio of ~0.28, suggesting that the crust below the Dhanbad area is intermediate to mafic in nature. The single station BB data shed new light to the estimate of crustal thickness beneath the eastern India shield area, which was hitherto elusive. Further, it is observed that the global upper mantle discontinuity at 410 km is delayed by ~0.6 sec compared to the IASP-91 global model; this may be explained by a slower/hotter upper mantle; while the 660 km discontinuity is within the noise level of data.Keywords
Broadband Seismograms, Teleseismic Events, Receiver Function, Crust and Upper Mantle, Moho Discontinuity.- Comparison of some Chemical Characteristics of Indian and Canadian Brassica Seeds
Abstract Views :171 |
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Authors
Affiliations
1 Department of Nutrition, University of Guelph, Guelph, Ontario NIG 2W1, CA
2 Department of Nutrition, University of Guelph, Guelph, Ontario NIG 2W1, IN
1 Department of Nutrition, University of Guelph, Guelph, Ontario NIG 2W1, CA
2 Department of Nutrition, University of Guelph, Guelph, Ontario NIG 2W1, IN