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Bajpai, R. K.
- On the Geometry of Folds
Abstract Views :181 |
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Authors
Affiliations
1 Department of Applied Geology, University of Saugar, Sagar 470002, IN
1 Department of Applied Geology, University of Saugar, Sagar 470002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 6 (1991), Pagination: 629-631Abstract
For the purpose of differentiating various geometric classes of folds, the author has tried a new parameter. It has been designated as ratio ,√a. The value of √a varies from one geometric class of the folds to the other. Folds with class 1 geometry show a value greater than 1, whereas class 3 folds show a value less than 1. For the class 2 folds ,√a it is always 1.Keywords
Folds, Structural Geology.
- A Review on Corrosion Mechanism in the Borosilicate Nuclear Waste Glass for Long-Term Performance Assessments in Geological Repository
Abstract Views :220 |
PDF Views:2
Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 BETDD, Nuclear Recycle Group, BARC, Mumbai - 400 008, IN
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 BETDD, Nuclear Recycle Group, BARC, Mumbai - 400 008, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 238-244Abstract
Glass is an important material used for high-level nuclear waste (HLW) management, accommodates and immobilizes several constituents. The ability ot the nuclear waste glasses is to contain high-level radioactive wastes over the service life of a potential geologic repository. The corrosion of a complex waste glass is governed by two basic mechanisms, such as, ion exchange and hydrolysis. In the present review paper, leach rate experiments under accelerated pressure, temperature and controlled pH conditions are suggested to insight corrosion mechanism of complex nuclear waste glasses. The data obtained is required to be simulated, using geochemical codes to extrapolate corrosion of glass for long term performances assessments in the geological repository.Keywords
Corrosion, Leaching, Vitrification, Geological Lepository, Geochemical Codes.- Shock Basaltic Glasses from Lonar Lake, Maharashtra: a Potential Natural Analogue of Nuclear Waste Glasses
Abstract Views :182 |
PDF Views:144
Authors
Affiliations
1 Analytical Research Laboratory, Department of Petroleum and Polymer Engineering, MAEER's Maharashtra Institute of Technology, S No 124, Ex-Servicemen Colony, Kothrud, Pune - 41 1 038, IN
2 Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085, IN
1 Analytical Research Laboratory, Department of Petroleum and Polymer Engineering, MAEER's Maharashtra Institute of Technology, S No 124, Ex-Servicemen Colony, Kothrud, Pune - 41 1 038, IN
2 Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 4 (2006), Pagination: 545-547Abstract
No Abstract.Full Text
- Shock Basaltic Glasses from Lonar Lake, Maharashtra: a Potential Natural Analogue of Nuclear Waste Glasses
Abstract Views :193 |
PDF Views:135
Authors
Affiliations
1 Bhabha Atomic Research Center, Trombay, Mumbai - 400 085, IN
1 Bhabha Atomic Research Center, Trombay, Mumbai - 400 085, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 6 (2005), Pagination: 775-777Abstract
One of the most critical issues in nuclear waste management is the extrapolation of material and system behavior from Short-Term laboratory experiments, typically on the order of Two-Three years to thousands of years. Natural rhyolitic and basaltic glasses serve as potential natural analogues of nuclear waste glasses for providing insight on the long term performance assessment of these High-Level radioactive waste forms over thousands of years in a deep geological repository. In spite of compositional variation, a remarkable phenomenal similarity exists among these glasses in terms of alteration mechanism, rates and products when subjected to alteration by both fresh as well as marine waters. In this note, the geochemistry of shock glasses from world famous impact crater of Lonar Lake, Buldana district, Maharashtra is evaluated to assess its suitability for use as a natural analogue of waste glasses.Full Text
- Recent Advances in the Geological Disposal of Nuclear Wastes Worldwide and Indian Scenario
Abstract Views :201 |
PDF Views:193
Authors
Affiliations
1 Back End Technology Development Division, Nuclear Recycle Group Bhabha Atomic Research Center, Department of Atomic Energy, Mumbai - 400 085, IN
1 Back End Technology Development Division, Nuclear Recycle Group Bhabha Atomic Research Center, Department of Atomic Energy, Mumbai - 400 085, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 63, No 3 (2004), Pagination: 354-356Abstract
No Abstract.Full Text
- Radionuclide Transport Mechanism and In Situ Performance, Assessment of Waste Glasses, Metals and Clay Barriers of a Geological Repository: Possible Research Avenues at Puga Geothermal Field, Ladakh, Jammu and Kashmir
Abstract Views :188 |
PDF Views:2
Authors
Affiliations
1 Back End Technology Development Division, Nuclear Recycle Group, Bhabha Atomic Research Center, Department of Atomic Energy, Mumbai - 400 085, IN
2 Centre of Advanced Study in Geology, University of Saugor, Sagar, Madhya Pradesh - 470 003, IN
1 Back End Technology Development Division, Nuclear Recycle Group, Bhabha Atomic Research Center, Department of Atomic Energy, Mumbai - 400 085, IN
2 Centre of Advanced Study in Geology, University of Saugor, Sagar, Madhya Pradesh - 470 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 6 (2006), Pagination: 984-988Abstract
Good analogy in terms of migration of Cs, groundwater chemistry, thermal and hydraulic processes and near field geochemistry, has been noticed between the Puga Geothermal Field and a typical granite hosted nuclear waste geological repository. The former can contribute immensely for demonstration of long term degradation of material used in geological repository viz Waste glasses, Backfill and Buffer clays and rocks under the influence of varying thermal-Hydraulic and chemical conditions. It also holds good potential to study Cs migration, gas mobility and modification of groundwater chemistry, thereby providing field scale parametric values to a number of key processes of a geological repository for nuclear wastes. The results can be used to validate numerically simulated radionuclide migration pattern through various groundwater pathways.Keywords
Nuclear Wastes, Geological Repository, Puga Thermal Springs, Ladakh, Jammu and Kashmir.- Post Deccan Trap Faulting in Raigad and Thane Districts of Maharashtra
Abstract Views :239 |
PDF Views:141
Authors
Affiliations
1 Repository Projects Section, Back End Technology and Development Division, Bhabha Atomic Research Centre, Mumbai - 400 084, IN
2 Geological Survey of India, Shillong, IN
1 Repository Projects Section, Back End Technology and Development Division, Bhabha Atomic Research Centre, Mumbai - 400 084, IN
2 Geological Survey of India, Shillong, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 3 (2002), Pagination: 347-347Abstract
No Abstract.Full Text
- Near Hydrothermal Alteration of Obsidian Glass: Implications for Long Term Performance Assessments
Abstract Views :175 |
PDF Views:0
Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 BETDD, Nuclear Recycle Group, BARC, Mumbai - 400 008, IN
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 BETDD, Nuclear Recycle Group, BARC, Mumbai - 400 008, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 4 (2012), Pagination: 376-382Abstract
Obsidian glass alteration experiments under near hydrothermal conditions were performed to study mechanism and conditions of formation of altered minerals. X-ray diffraction patterns and cell dimensions of the specimens treated at 150, 200 and 300°C (pH = 8.03) revealed appearance of three main minerals - illite (9.5-10 Å), chlorite (7.04 Å) and halloysite (10.25Å). Further increase in the pH favours matrix dissolution with the formation of secondary altered layers. SEM-EDS study show that the alteration causes smoothing of the grain surfaces. These surfaces exhibits etch pits and series of depressions, formed by the process of dissolution. SEM - Back Scattered Electron images of obsidian specimens show thin laminae of smectite, with foliated bulky rims and cellular honeycomb texture, formed by precipitation from the solution as well as by direct transformation of glass during alteration. This mechanism is resulting from the alteration of alkalis by ionic inter-diffusion with H3O+ and H+ and inward diffusion of H2O, leading to free diffusion of silica into solution and then to a local rearrangement of the glass framework. Thus, a direct transformation of glass into clay minerals is the major reaction mechanism as evidenced by the mechanism of glass dissolution and subsequent mineral precipitation.Keywords
Near Hydrothermal Condition, Geological Repository, Dissolution, Mineral Precipitation.References
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