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Reddy, G. R.

Rare Earth Element Geochemistry of Basalt-Spilite Association of Bombay and Carlsberg Ridge-A Preliminary Study

Rare Earth Geochemistry of Basalts from the 'FAMOUS' Area Mid-Atlantic Rift Valley-A Preliminary Study

Petrogenetic Significance of Rare Earth Element Patterns of Selected Samples of Ingaldhal Metavolcanics, Karnataka State, India: Consortium Studies No.1

Natural Base Isolation System for Earthquake Protection

Abstract Views :212 | PDF Views:86

Authors

Srijit Bandyopadhyay ¹, Aniruddha Sengupta ¹, G. R. Reddy ²

Affiliations
1 Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721 302, IN
2 Structural and Seismic Engineering Section, Homi Bhaba National Institute, Mumbai 400 094, IN

Source

Current Science, Vol 107, No 6 (2014), Pagination: 1037-1043

Abstract

The performance of a well-designed layer of sand, geo-grid, geo-textiles and composites like layer of sand mixed with shredded tyre (rubber) as low-cost base isolators is studied in shake table tests in the laboratory. The building foundation is modelled by a 200 mm × 200 mm and 40 mm thick, rigid plexi-glass block. The block is placed in the middle of a 1 m × 1 m tank filled with sand. The selected base isolator is placed between the block and the sand foundation. Accelerometers are placed on top of the footing and foundation sand layer. The displacement of the footing is also measured by transducers. The whole set-up is mounted on the shake table and subjected to sinusoidal motion with varying amplitude and frequency. Sand is found to be effective only at very high amplitude (>0.65 g) of motion. Among all the different materials tested, the performance of a composite consisting of sand and 50% shredded rubber tyre placed under the footing is found to be the most promising as a low-cost, effective base isolator.

Keywords

Base Isolation, Earthquake Protection, Shake Table Test, Shredded Rubber Tyre.

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Comparative Studies on Quality Assessment of Trachyspermum Ammi Linn. Seeds Collected from Different locations of Punjab State

Abstract Views :171 | PDF Views:0

Authors

A. K. Meena ¹, M. M. Rao ², R. Sannd ¹, A. K. Mangal ¹, G. R. Reddy ³, M. M. Padhi ⁴, Ramesh Babu ⁵

Affiliations
1 National Institute of Ayurvedic Pharmaceutical Research, CCRAS, Patiala -147001, IN
2 National Institute of Ayurvedic Pharmaceutical Research, CCRAS, Patiala -147001, IN
3 Raja Ramdeo Anandilal Podar Ayurveda Cancer Research Institute, Mumbai, IN
4 Central Council for Research in Ayurveda and Siddha, Janakpuri, Delhi-110058, IN
5 Central Council for Research in Ayurveda and Siddha, Janakpuri, Delhi- 110058, IN

Source

Research Journal of Pharmacognosy and Phytochemistry, Vol 3, No 1 (2011), Pagination: 41-44

Abstract

Ayurveda, the science of life, deals with the holistic view of healthy living. It emphasizes on prevention as well as treatment of various disease conditions through holistic approach. Since ancient times, several diseases have been treated by administration of plant material based on traditional method and approaches. Investigation of traditionally used medicinal plants is thus valuable on two levels, firstly, as a source of potential chemotherapeutic drugs, and secondly, as a measure of safety for the continued use of medicinal plants. The seeds of Trachyspermum ammi Linn. are being used in traditional folk medicines for the treatment of various gastro-intestinal and inflammatory disorders. It is a bitter, aromatic, thyme like aroma warming herb, and possesses tonic, diuretic, and expectorant properties. It relaxes spasms, improves digestion, increases perspiration and is a strong antiseptic. Physicochemical studies on various parameters like total ash, acid insoluble ash, water soluble ash, ethanol soluble extractive value, water soluble extractive value, loss on drying, pH, TLC reveal specific identities for the crude drug which will be useful in identification and help in controlling adulterations.

Keywords

Ayurveda, Thymol, Phytochemistry, Trachyspermum ammi Linn.

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A Comparative Assessment of the Seismic Response of an Earthen Dam Using Analytical Simulation and Empirical Methods

Abstract Views :251 | PDF Views:74

Authors

Srijit Bandyopadhyay ¹, Raj Banerjee ¹, Aniruddha Sengupta ², Y. M. Parulekar ¹, G. R. Reddy ¹

Affiliations
1 Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, IN
2 Civil Engineering Department, Indian Institute of Technology Kharagpur, Kharagpur 721 302, IN

Source

Current Science, Vol 113, No 05 (2017), Pagination: 902-910

Abstract

This article presents the permanent deformation of an earthen dam located in the vicinity of a safety related structure for M_w = 6.5 design basis earthquake. A non-linear 2D dynamic analysis using a real earthquake motion compatible with the design spectrum was performed to check the earthquake-induced deformations of the dam. Deformations of the dam were also estimated by semi-empirical and empirical methods suc has Seed and Makdisi’s method, Newmark’s double integration method, Jansen’s method and Swaisgood’s method. Results from different methods are compared to obtain a range for the value of permanent deformations of the dam. It is observed that the lateral deformation obtained by Seed and Makdisi’s method is the highest while Jansen’s method predicts the highest crest settlement. The crest settlement of the dam is found to vary between 11.8 mm and 17.8 mm, which is within the safety limits according to IITK-GSDMA guidelines.

Keywords

Earthen Dam, Dynamic Analysis, Deformations, Non-Linear Finite Element Analysis.

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References

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Jansen, R. B., Estimation of embankment dam settlement caused by earthquake. Int. Water Power Dam Constr., 1990, 42(12), 35–40.

Swaisgood, J. R., Estimating deformation of embankment dams caused by earthquakes. In ASDSO Western Regional Conference, Montana, USA, 1995, pp. 1–7.

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Seed, H. B. and Martin, G. R., The seismic coefficient in earth dam design. J. Soil Mech. Found. Div., 1966, 92(3), 25–58.

Seed, H. B. and Idriss, I. M., A simplified procedure for evaluating soil liquefaction potential. J. Soil Mech. Found. Div., ASCE, 1971, 97(9), 1249–1274.

IIT-K, GSDMA guidelines for seismic design of earth dams and embankments, 2007.

Study of a Surface Raft Foundation in Dry Cohesionless Soil Subjected to Dynamic Loading

Abstract Views :282 | PDF Views:84

Authors

Raj Banerjee ¹, Aniruddha Sengupta ², G. R. Reddy ¹

Affiliations
1 Bhabha Atomic Research Centre, Mumbai 480 005, IN
2 Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721 302, IN

Source

Current Science, Vol 117, No 11 (2019), Pagination: 1800-1812

Abstract

In this study, behaviour of a raft foundation in dry cohesionless soil when subjected to dynamic loadings is presented. The numerical model is validated by model tests on shaking table and numerically by a plane strain finite difference program, FLAC 2D. In both shaking table tests and numerical analyses, the raft located in dry Kasai River sand in Kharagpur has been subjected to 10 cycles of equivalent sinusoidal loadings with an amplitude of 0.2412 g at a frequency of 2 Hz, which represents an irregular time history of the Loma Prieta Earthquake (1989). The results of the above study in terms of response time histories, bending moment and lateral displacement of the raft have been validated with numerical simulations, and the results are in reasonable agreement with the corresponding experimental findings. A methodology to study the behaviour of a raft foundation subjected to harmonic excitations has been proposed in terms of vertical deformations of the raft foundation in dry sand for a given value of dynamic (or degraded) factor of safety.

Keywords

Dry Soil, Dynamic Loading, Numerical Analysis, Raft Foundation, Shaking Table Test.

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References

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Banerjee, R., Konai, S., Sengupta, A. and Deb, K., Shake table tests and numerical modeling of Kasai River Sand. Geotech. Geol. Eng., 2017, 35(4), 1327–1340.

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Bandyopadhyay, S., Sengupta, A. and Reddy, G. R., Performance of sand and shredded rubber tire mixture as a natural base isolator for earthquake protection. Earthq. Eng. Eng. Vib., 2015, 14(4), 683–693.

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Commissioning of the MACE gamma-ray telescope at Hanle, Ladakh, India

Abstract Views :196 | PDF Views:74

Authors

K. K. Yadav ¹, N. Chouhan ², R. Thubstan ², S. Norlha ², J. Hariharan ², C. Borwankar ², P. Chandra ², V. K. Dhar ¹, N. Mankuzhyil ², S. Godambe ², M. Sharma ², K. Venugopal ², K. K. Singh ¹, N. Bhatt ², S. Bhattacharyya ¹, K. Chanchalani ², M. P. Das ², B. Ghosal ², S. Godiyal ², M. Khurana ², S. V. Kotwal ², M. K. Koul ², N. Kumar ², C. P. Kushwaha ², K. Nand ², A. Pathania ², S. Sahayanathan ¹, D. Sarkar ², A. Tolamati ², R. Koul ³, R. C. Rannot ⁴, A. K. Tickoo ⁵, V. R. Chitnis ⁶, A. Behere ⁷, S. Padmini ⁷, A. Manna ⁷, S. Joy ⁷, P. M. Nair ⁷, K. P. Jha ⁷, S. Moitra ⁷, S. Neema ⁷, S. Srivastava ⁷, M. Punna ⁷, S. Mohanan ⁷, S. S. Sikder ⁷, A. Jain ⁷, S. Banerjee ⁷, Krati ⁷, J. Deshpande ⁷, V. Sanadhya ⁸, G. Andrew ⁸, M. B. Patil ⁸, V. K. Goyal ⁸, N. Gupta ⁸, H. Balakrishna ⁸, A. Agrawal ⁸, S. P. Srivastava ⁹, K. N. Karn ⁹, P. I. Hadgali ⁹, S. Bhatt ⁹, V. K. Mishra ⁹, P. K. Biswas ⁹, R. K Gupta ⁹, A. Kumar ⁹, S. G. Thul ⁹, R. Kalmady ¹⁰, D. D. Sonvane ¹⁰, V. Kumar ¹⁰, U. K. Gaur ¹⁰, J. Chattopadhyay ¹¹, S. K. Gupta ¹¹, A. R. Kiran ¹¹, Y. Parulekar ¹¹, M. K. Agrawal ¹¹, R. M. Parmar ¹¹, G. R. Reddy ¹², Y. S. Mayya ¹³, C. K. Pithawa ¹⁴

Affiliations
1 Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India; Homi Bhabha National Institute, Mumbai 400 085, India, IN
2 Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
3 Formerly at Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
4 Raja Ramanna Fellow at Astrophysical Sciences Division, Mumbai 400 085, India, IN
5 Deceased, IN
6 Department of High Energy Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India, IN
7 Electronics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
8 Control and Instrumentation Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
9 Center for Design and Manufacture, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
10 Computer Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
11 Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
12 Formerly at Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
13 Formerly at Reactor Control Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
14 Formerly at Electronics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN

Source

Current Science, Vol 123, No 12 (2022), Pagination: 1428-1435

Abstract

The MACE telescope has recently been commissioned at Hanle, Ladakh, India. It had its first light in April 2021 with a successful detection of very high energy gamma-ray photons from the standard candle Crab Nebula. Equipped with a large light collector of 21 m diameter and situated at an altitude of ~4.3 km amsl, the MACE telescope is expected to explore the mysteries of the non-thermal Universe in the energy range above 20 GeV with very high sensitivity. It can also play an important role in carrying out multi-messenger astronomy in India.

Keywords

Gamma-ray astronomy, high energy radiative processes, non-thermal Universe, telescope.

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Author Details

Reddy, G. R.

Rare Earth Element Geochemistry of Basalt-Spilite Association of Bombay and Carlsberg Ridge-A Preliminary Study

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Abstract

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Rare Earth Geochemistry of Basalts from the 'FAMOUS' Area Mid-Atlantic Rift Valley-A Preliminary Study

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Petrogenetic Significance of Rare Earth Element Patterns of Selected Samples of Ingaldhal Metavolcanics, Karnataka State, India: Consortium Studies No.1

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Natural Base Isolation System for Earthquake Protection

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Comparative Studies on Quality Assessment of Trachyspermum Ammi Linn. Seeds Collected from Different locations of Punjab State

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A Comparative Assessment of the Seismic Response of an Earthen Dam Using Analytical Simulation and Empirical Methods

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Study of a Surface Raft Foundation in Dry Cohesionless Soil Subjected to Dynamic Loading

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Commissioning of the MACE gamma-ray telescope at Hanle, Ladakh, India

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