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Singhvi, A. K.
- Desert Quaternary Formations and their Morphostratigraphy: Implications for the Evolutionary History of the Thar
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PDF Views:1
Authors
Affiliations
1 Central Arid Zone Research Institute, Jodhpur-342 003, IN
2 Deccan College, Pune-411 006, IN
3 Physical Research Laboratory, Ahmedabad-380 009, IN
1 Central Arid Zone Research Institute, Jodhpur-342 003, IN
2 Deccan College, Pune-411 006, IN
3 Physical Research Laboratory, Ahmedabad-380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 43, No 4 (1994), Pagination: 435-447Abstract
Morphogenetic manifestations and stratigraphy of the Quaternary alluvial and aeolian formations of the desertic tract of Rajasthan have been described. The stratigraphy is based on a study of deep sections (-15 m) from different locations. Additionally, well-logs have been used to prepare the isopach maps of these formations. It is inferred that during the major part of the Pleistocene, the region witnessed widespread alluvial sedimentation. Though the region was well-watered then, the presence of large masses of lime coupled with negligible in-situ weathering suggests, that over-all the environment must have been predominantly semi-arid. Presence of nodular and lithic calcrete bands suggests an episodic character of this sedimentation. The form and distribution of surficial calcretes (including polycyclic lime nodules) suggest several cycles of calcrete formation.
Thermoluminescence dating of aeolian sands sampled from 28 to 65 metre depths suggest that the antiquity of the aeolian dynamism extends to atleast 100 ka B.P. The period from c.25 to 50 ka B.P. consistently shows the presence of wetter interludes with weaker aeolian dynamism, a fluvial redistribution of sediments and formation of nodular calcretes and gypcretes. The last major aeolian activity peaked at LGM in the Sahara, the Australian and the Kalahari deserts. However, the evidence on Thar suggests a peak in aeolian activity post-dating the LGM.
Keywords
Thar, Quaternary Stratigraphy, Geomorphology, Paleoenvironment, Rajasthan.
- Environmental Changes during Late Pleistocene in the Orsang River Basin, Western India
Abstract Views :233 |
PDF Views:2
Authors
Affiliations
1 Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, IN
2 Department of Geology, M S University of Baroda, Vadodara - 390 002, IN
1 Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, IN
2 Department of Geology, M S University of Baroda, Vadodara - 390 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No Spl Iss 4 (2004), Pagination: 471-479Abstract
Chronometric and sedimentological data generated from the exposed Quaternary sequences of the Orsang River basin indicate close correspondence between the environmental changes and fluvial aggradation. The oldest and regionally extensive fine Silty-Clay occurring at the base of the successions is dated to >97 ka suggesting prevalence of high sinuosity suspended load fluvial regime. Its stratigraphics portion suggests that the deposition occurred during the enhanced southwest monsoon corresponding to the Marine isotopic Stage-5 (MIS-5). The gravel deposits that overlie provide an age of -60 ka indicating dominance of braided system (MIS-4) during the reduced southwest monsoon. The pluvial interstadial (MIS-3) is represented by flood plain facies that was deposited under the persistent fluvial system strengthened by enhanced southwest monsoon and assigned ages ranging between 50 and 30 ka. An extensive aeolian sand sheet that blankets the topography, is luminescence dated to 21 ka suggesting the onset of Last Glacial Maximum in the Orsang River basin.Keywords
Late Pleistocene, Fluvial Aggradation, Environmental Change, Orsang River Basin, Western India.- S. P. Pandya (1928–2019)
Abstract Views :195 |
PDF Views:77
Authors
Y. R. Waghmare
1,
D. P. Ahalpara
1,
V. K. Thankappan
1,
V. K. B. Kota
1,
A. Joshipura
1,
A. K. Singhvi
1
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
1 Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Current Science, Vol 117, No 6 (2019), Pagination: 1104-1106Abstract
Professor Sudhir Pradyumna Pandya, former Director, Physical Research Laboratory, Ahmedabad passed away on 30 June 2019. He was born on 11 July 1928 in Nadiad, Gujarat. He did his B Sc from Bombay University and M Sc from Delhi University in 1950. After working as DAE research associate for three years, he went to Rochester University, USA for a Ph D degree. He joined Physical Research Laboratory (PRL) in 1957 and nucleated the theoretical physics group. He continued at PRL till his superannuation in 1987. He served as Deputy Director during the years 1973–1982 and as Director during 1983–1987. He was one of the founding members and Fellow of Gujarat Science Academy (GSA), President of the Indian Association of Physics Teachers (IAPT), Fellow of Indian National Science Academy and Indian Academy of Sciences. He received Vikram Sarabhai award from the Gujarat state in 1994. He is survived by his wife (Harshidaben) and two sons (Abhijit and Pravir), both acclaimed professionals in their respective fields.Full Text
References
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- Suggestions for a National Framework for Publication of and Access to Literature in Science and Technology in India
Abstract Views :237 |
PDF Views:73
Authors
S. Chakraborty
1,
J. Gowrishankar
2,
A. Joshi
3,
P. Kannan
4,
R. K. Kohli
4,
S. C. Lakhotia
5,
G. Misra
6,
C. M. Nautiyal
7,
K. Ramasubramanian
8,
N. Sathyamurthy
3,
A. K. Singhvi
9
Affiliations
1 National Institute of Plant Genome Research, New Delhi, IN
2 Indian Institute of Science Education and Research Mohali, IN
3 Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, IN
4 Central University of Punjab, Bathinda, IN
5 Banaras Hindu University, Varanasi, IN
6 Indian Institute of Science, Bengaluru, IN
7 Indira Nagar, New Delhi, IN
8 Indian Institute of Technology, Mumbai, IN
9 Physical Research Laboratory, Ahmedabad, IN
1 National Institute of Plant Genome Research, New Delhi, IN
2 Indian Institute of Science Education and Research Mohali, IN
3 Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, IN
4 Central University of Punjab, Bathinda, IN
5 Banaras Hindu University, Varanasi, IN
6 Indian Institute of Science, Bengaluru, IN
7 Indira Nagar, New Delhi, IN
8 Indian Institute of Technology, Mumbai, IN
9 Physical Research Laboratory, Ahmedabad, IN
Source
Current Science, Vol 118, No 7 (2020), Pagination: 1026-1034Abstract
The outcome of deliberation on various aspects of publication and free access to scientific literature by a panel of nominated fellows from three science academies, viz. Indian National Science Academy, Indian Academy of Sciences, The National Academy of Sciences India, and expert invitees are presented.Full Text
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- Improving the STI landscape through an augmented and revitalized postdoctoral fellowship programme
Abstract Views :166 |
PDF Views:82
Authors
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 054, IN
1 Physical Research Laboratory, Ahmedabad 380 054, IN
Source
Current Science, Vol 122, No 6 (2022), Pagination: 660-663Abstract
In the emerging knowledge driven world, India will require individuals with sufficient skills, professional agility, and technical acumen to serve as its development engines for science and societal well-being. This contribution intends to begin a discussion about contemporary post-doctoral research programmes, the possibility of establishing a national cadre for a planned and careful intake of quality students, as well as broad basing their training. Synergies in sciences for resource optimization and, accountabilities in the science, as also in its administration including finance, will be critical to Indian science.Keywords
Innovation, postdoctoral fellowship, science, technology.Full Text
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