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
Sengupta, B.
- Reproduction of Dsl from Seed in the Jalpaiguri Division
Authors
Source
Indian Forester, Vol 33, No 12 (1907), Pagination: 549-552Abstract
No abstract
- Macaranga Denticulata Muell Arg ( Euphorbiaceae)
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Source
Indian Forester, Vol 34, No 5 (1908), Pagination: 281-282Abstract
No abstract- Fire Conservancy in Indian Forests
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Source
Indian Forester, Vol 36, No 3 (1910), Pagination: 133-145Abstract
No abstract- Local Seeds V. foreign Seeds
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Source
Indian Forester, Vol 51, No 12 (1925), Pagination: 604-604Abstract
No abstract- Geochemistry and Petrography of U-Th-Y Mineralisation in Alkali Feldspar Granite (Alaskite) Dykes around Dhanota, Mahendragarh District, Haryana, India
Authors
1 Atomic Minerals Division, Department of Atomic Energy, New Delhi-110066, IN
2 Atomic Minerals Division, Department of Atomic Energy, Hyderabad-500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 2 (2000), Pagination: 189-196Abstract
Radioactive alkali feldspar granite (alaskite) occurs as dykes within the Proterozoic granite gneiss around Dhanota. Samples have assayed 0.011 to 0.16% U3O8 and 0.005 to 0.16% ThO2. Yttrium values range from 250 to 800 ppm. Uranothorite occurs in association with zircon, xenotime, magnetite, hematite, sphene and goethite. The U-Th-Y mineralisation in alaskites of Dhanota is disseminated syn-magmatic intrusive type.Keywords
Economic Geology, Geochemistry, Petrography, Alaskite Dyke, Xenotime, Uranothorite, Dhanota, Haryana.- Reverse Micelles of Triton X-100 in Mixed Solvents of Benzene and N-Hexane : Fluorescence Studies Using 7-Hydroxy Flavone as a Probe
Authors
1 Biophysics Division, Saha Institute of Nuclear Physics, 37, Belgachia Road, Calcutta-700 037, IN
Source
Journal of Surface Science and Technology, Vol 14, No 1-4 (1998), Pagination: 150-156Abstract
7-Hydroxyflavone (7HF), has been used as a fluorescence probe to investigate the microenvironments and water distribution in Triton X-100 (TX-100) reverse micelles in benzene/n- hexane mixed solvents at different water/surfactant molar ratio (w0). Upon variation of w0, the green fluorescence emission of 7 HF shows dramatic spectral shifts, with the emission maximum (λmaxem) varying from λmaxem = 527 nm at w0 = 0, to λmaxem = 552 nm at w0 = 9. Variation of w0 over this range also leads to a significant increase in the fluorescence polarisation anisotropy (FPA). These results are interpreted in terms of changes in the local environment of the fluorophore. It is also evident that the formation of bulk water starts at w0 = 2.5 in the TX-100/benzene/n-hexane reverse micelles, in agreement with the absorption probe studies.Keywords
7-Hydroxyflavone, Triton X-100, Reverse Micelles, Fluorescence Emission, Fluorescence Anisotropy.- Identification and Mapping of Chromium (VI) Plume in Groundwater for Remediation: A Case Study at Kanpur, Uttar Pradesh
Authors
1 Central Pollution Control Board, Ministry of Environment and Forests, Govt. of India, IN
2 Centre of Advanced Study in Geology, University of Lucknow, Lucknow, IN
3 National Geophysical Research Institute (CSIR), Hyderabad, IN
4 Department of Civil Engineering, Indian Institute of Technology, Kanpur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 1 (2009), Pagination: 49-57Abstract
With only twenty five percent population living in urban areas, India has cities amongst the biggest in the world. Urban growth in most of Indian cities is concomitant with rise in water demand for community, as well as, for industrial purposes. The complex situation resulting from indiscriminate disposal of waste and its severe impact on groundwater quality is set for continuous worsening mainly for want of sustained effort aimed at site-specific remediation.
The study, a prerequisite for actual remediation in an industrial city of Kanpur, India, envisages detailed investigation about pollutant transport, evaluation of concept of Bio-remediation and a range of other options and finally full scale implementation of the best suited. Drilling of piezometers and resistivity survey indicates that the area is constituted of alluvial sands, gravels and their various admixtures. Chemical analysis of water samples collected from piezometers and hand pumps shows the presence of hexavalent chromium rich horizons at various depths. The alarming concentration of this carcinogenic heavy metal of the order of 16.3 mg/l against the permissible concentration (of 0.05 mg/l) for drinking water and high concentration within sediments of the area poses a major threat to the entire ecosystem. The projection of migration contaminant plume of hexavalent chromium as depicted in the paper is indicative of a concentrated extent of core zone existing in shallow alluvial aquifer, which may be targeted for interception by remedial measures.
The present work, elaborating on the source, potential and monitoring the migration of the pollutant plume is the first field scale study of its kind in the country. The findings of these studies are of strong relevance in addressing the ground water pollution due to indiscriminate disposal practices of hazardous waste in areas located within the alluvial zones.
Keywords
Groundwater, Hexavalent Chromium, Pollutant Transport, Kanpur, Uttar Pradesh.References
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