Dhanbad, India

Indian School of Mines

Dhanbad, India

The Indian School of Mines is an educational institute of India. It is located in the mineral-rich region of India, in the city of Dhanbad. It was established by British Indian Government on the lines of the Royal School of Mines - London, and was formally opened on 9 December 1926 by Lord Irwin, the then Viceroy of India. What started as an institution to impart mining education has now grown into a full-fledged technical institution of international acclaim offering a host of programmes like B. Tech., M. Tech., M. Sc. Tech., and MBA. ISM admits undergraduate students from the top rankers out of the 150,000 candidates appearing for Advanced Joint Entrance Examination which is the replacement of IIT-JEE.Indian School of Mines has 18 academic departments covering Engineering, Applied science, Humanities and Social science and Management programs with a strong emphasis on scientific and technological education and research in the areas of Earth science. The school has produced many pioneers of the Mining and Oil Industry, including Padma Bhushan awardees. ISM has been ranked consistently as one of the top 12 engineering institutions in India. Wikipedia.

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Das S.,Indian School of Mines
IEEE Transactions on Industrial Informatics | Year: 2017

This paper proposes a novel fault-tolerant control (FTC) scheme for direct torque control (DTC) of induction motor (IM) drives against the line current sensor failures. Three major steps involved in the proposed FTC scheme are the detection of sensor fault, isolation of the same and finally, the reconfiguration by proper estimation. Third-difference operator employed in the motor line current is found suitable for the detection of the sensor fault while flux linkage observer based current estimation scheme performs the task of estimation of line current post the occurrence of the fault. Further, a decision-making logic circuitry isolates the faulty signal and simultaneously selects the appropriate estimated current signal to make the drive fault tolerant. The proposed current sensor FTC scheme is simple and unique in nature. Moreover, it can be universally applied with any speed control schemes involving IM drive. The proposed scheme is simulated and extensively tested in MATLAB/Simulink. The obtained simulation results are also verified using a dSPACE-1104 based IM drive laboratory prototype to show the effectiveness of the scheme. IEEE

Dey R.,Indian School of Mines | Rai V.K.,Indian School of Mines
Dalton Transactions | Year: 2014

The frequency upconversion emissions in the Er3+/Er 3+-Yb3+ doped/codoped hexagonal shaped La 2O3 phosphor characterized by X-ray diffraction (XRD) upon excitation with 980 nm and 800 nm CW lasers have been investigated. The upconversion emissions corresponding to the 2H9/2 → 4I15/2, 2H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions peaking at 409 nm, 523 nm, 548 nm and 660 nm have been observed under 980 nm excitation whereas 523 nm, 548 nm and 660 nm upconversion emission bands have been visualized under 808 nm excitation. The upconversion emission intensity of Er3+ ions is enhanced by several times due to the codoping with Yb3+ ions, under 980 nm excitation while there is a reduction in intensity in the codoped sample under 808 nm excitation. The decay curve analysis for the green UC emission band corresponding to the 4S3/2 → 4I 15/2 transition in the Er3+/Er3+-Yb 3+ doped/codoped La2O3 phosphor upon 980 nm excitation has been done. The colour coordinate of the phosphor sample has been calculated at different pump powers and its value is observed to be almost similar to that of the standard green colour and also independent of the excitation power density. The effect of temperature on the upconversion emission intensity of the green emissions has been determined and noted that the present phosphor material can be used in making temperature sensing device upto 600 K. © 2014 The Royal Society of Chemistry.

Mathai A.J.,Indian School of Mines
IEEE Transactions on Electron Devices | Year: 2011

Ga-pWSe2 Schottky diodes were fabricated on both uncleaved and cleaved WSe2 surfaces and were subjected to forward current-voltage-temperature measurements. The conduction mechanisms have been studied over a temperature range of 140 K-300 K. From and above 200 K onwards, the current-voltage characteristics of both diodes obey thermionic emission (TE) theory with Gaussian barrier height distribution. At temperatures below 200 K, the presence of generation-recombination (GR) and tunneling (TN) currents becomes noticeable. The observed anomalies at low temperatures were effectively interpreted in terms of the combined influence of TE, GR, and TN currents across the interface. Furthermore, the cleaved diode with less surface inhomogeneity showed better characteristics than the uncleaved diode. © 2011 IEEE.

A detailed examination of lithostratigraphic, tectonothermal, geochronologic and palaeomagnetic database of the Dharwar-Bastar cratons of South India, the Yilgarn craton of Western Australia and the East Antarctic shield has shown broad similarity. Two palaeomagnetic key poles of ~. 2400. Ma age from the Dharwar and Yilgarn cratons suggest near neighbor positions. Matching patterns of craton outlines, orientation of mafic dyke swarms and palaeo-north direction for ~. 2400. Ma have established a continental assembly of "SIWA", an acronym for South India (SI) and Western Australia (WA), at ~. 2400. Ma. In this assembly the Yilgarn craton fits against the Bastar craton and the Singhbhum craton. The available geological data from the Napier Complex of the Eastern Antarctica and the Dharwar craton of South India were used to prepare the barcode style reconstruction of Archaean tectonostratigraphic events of both the cratons. The method of matching continental outlines, the internal features of two continental blocks and the palaeomagnetic data demonstrate that the Napier Complex was also a part of "SIWA" during the period 2200-1900. Ma and was located at the position of the Cuddapah basin of India adjacent to the Dharwar craton and the Yilgarn craton. The separation of the Napier Complex from the south Indian block led to the development of the Cuddapah basin at ~ 1950. Ma. © 2011 International Association for Gondwana Research.

Mohanty S.P.,Indian School of Mines
Geological Society Memoir | Year: 2015

The Bastar Craton of India is composed of Archaean nuclei of tonalite-trondhjemite-granodiorite gneisses, enveloped by an older granite-greenstone belt (>3000 Ma) with banded iron formation (BIF), and an auriferous younger granite-greenstone belt with BIF. Available geological, geochemical and geochronological data indicate multiple episodes of orogeny with high-grade metamorphism at 3200-3300, 2600-2700, 2100-2200, 1900-2000, 1800-1850, 1500-1600 and 1400-1450 Ma, and continental rifting and basin development marked by emplacement of mafic dyke swarms at c. 2900 (subalkaline mafic dykes; BD-1A), 2480 (high-Mg mafic dykes; BD-1B), 2100 (Fe-tholeiite dykes; BD-2A), 1880 (Fe-tholeiites dykes; BD-2B), 1776 and 1422 Ma. Associations of extensive bimodal volcanics and riftogenic sediments are found in the Neoarchaean and Palaeoproterozoic basins of the craton. Evidence of Palaeoproterozoic (Huronian) glaciation and associated 'cap carbonate' followed by deposition of fine clastics with manganese ore is found in the Palaeoproterozoic Sausar Group. The lithological association of the Sausar Group is comparable to the carbonate-tillite association of the Huronian Supergroup, Snowy Pass Supergroup, Transvaal Supergroup and Turee Creek Group. The geological evolution of the Bastar Craton matches that of Western Australia and South Africa. Such similarities can be analysed to develop a unified Palaeoproterozoic assembly for these provinces. © 2015 The Geological Society of London.

Dutta S.,Indian School of Mines
Journal of Industrial and Engineering Chemistry | Year: 2014

Energy price is rising due to rapid depletion of fossil fuels. Development of renewable and non-polluting energy resources is necessary for reducing pollution level caused by those conventional fuels. Researchers have recognized hydrogen (H2) as such an energy source. Hydrogen is a potential non-carbon based energy resource, which can replace fossil fuels. Hydrogen is considered as the alternative fuel as it could be generated from clean and green sources. Despite many advantages, storage of hydrogen is a serious problem. Due to high inflammability, adequate safety measures should be taken during the production, storage, and use of H2 fuel. This review article elucidates production methods and storage of hydrogen. Besides this safety related to H2 handling in refilling station, and automobiles has also been discussed. Study shows that safety program and awareness could be fruitful for increasing the acceptance of hydrogen as fuel. © 2013 The Korean Society of Industrial and Engineering Chemistry.

Pandey A.,Indian School of Mines | Rai V.K.,Indian School of Mines
Dalton Transactions | Year: 2013

The codoping effect of Zn2+ ions on luminescence emission in visible and near infrared (NIR) regions of Y2O3:Ho 3+-Yb3+ phosphor prepared by low temperature combustion process have been investigated under 980 nm and 448 nm excitations. The phase and crystallite size of the prepared phosphor were determined by X-ray diffraction analysis and processes involved in the upconversion mechanism have been discussed in detail via pump power dependence, decay curve analysis and a suitable energy level diagram. The temperature sensing performance of the developed material has also been investigated by measuring the fluorescence intensity ratio of the blue upconversion emission bands centred at 465 nm and 491 nm up to 673 K. It is found that by using fluorescence intensity ratio technique, appreciable sensitivity for temperature measurement can be achieved from the present phosphor material, which indicates its applicability as a high temperature sensing probe. The fabrication of green LEDs using the developed phosphor material has also been suggested. This journal is © The Royal Society of Chemistry 2013.

Dey S.,Indian School of Mines
Precambrian Research | Year: 2013

A synthesis of the available Nd isotope data from the Dharwar craton puts important constrains on antiquity of crust, extent of basement terranes, and events marking juvenile crustal addition and crustal recycling. The craton is divided into two blocks, namely eastern Dharwar craton (EDC) and western Dharwar craton (WDC). Nd model ages trace crust extraction as far as 3.5. Ga back in both the blocks, although rock record of such antiquity is yet to be found in the craton. In WDC 3.35-3.0. Ga is the most significant period of juvenile crustal addition as well as crustal recycling. Significantly depleted mantle (e{open}= +1.5 to +6.4) existed below the WDC as early as 3.35. Ga, which was probably refertilized in a later event. From the resultant chondritic to slightly enriched mantle (e{open}= -0.3 to +0.4) juvenile mafic crust was added to the WDC during 2.9-2.6. Ga. A widespread crustal recycling event at ∼2.6. Ga marks the last major event in this block. In EDC 3.3-3.0. Ga granitoids occur as vestiges and show Nd model ages higher than crystallizations ages suggesting recycling of Palaeoarchaean crust. During 2.7-2.5. Ga extensive juvenile magmatism took place in EDC from variably depleted mantle (e{open}= +1.4 to +5.6) which is later than the global 2.7. Ga peak of crustal growth. Attendant crustal recycling destroyed most of the earlier crust. Distribution of Nd model ages suggests, in contrast to general believe, that Palaeoarchaean crust was not only abundant in the WDC but also widespread in an area extending from the WDC-EDC boundary to further 60-150. km east up to the Hungund-Ramagiri-Kolar (HRK) belt. This belt appears to be a major crustal boundary along which terranes of different Nd isotope signatures were amalgamated during the late Neoarchaean by horizontal accretion. Major Neoarchaean crustal recycling events documented in the Dharwar craton are missing from Nd isotope record of the Eastern Block (EB) of the North China Craton. This fact does not support correlation between the two cratons as suggested by some authors. © 2012 Elsevier B.V.

Reconstruction of the Neoproterozoic supercontinent Rodinia shows near neighbour positions of the South Indian Cratons and Western Australian Cratons. These cratonic areas are characterized by extensive Paleoproterozoic tectonism. Detailed analysis of the spatio-temporal data of the Satpura Mountains of India indicates presence of at least three episodes of Proterozoic orogeny at ∼2100-1900 Ma, ∼1850 Ma and ∼1650 Ma, and associated basin development and closing. A subdued imprint of the Grenville orogeny (∼950 Ma) is also found in rock records of this Mountain Belt. The Capricorn Orogen of Western Australia also shows three episodes of orogeny: Opthalmian-Glenburgh Orogeny (2100-1950 Ma), Capricorn Orogeny (∼1800 Ma) and Mangaroon Orogeny (∼1650 Ma), and basin opening and closing related to these tectonic movements. These broad similarities suggest their joint evolution possibly in a near neighbour position during Paleoproterozoic Era. In view of juxtaposition of the Western Australia along the east coast of India, at the position of the Eastern Ghats, during Archean, it is suggested that the breaking of this Archean megacraton at ∼2400 Ma led to northward movement of the broken components and formation of the Satpura-Capricorn Orogen (at ∼2100 and ∼1800 Ma) due to the collision of cratonic blocks with the pre-existing northern cratonic nuclei of India and Western Australia. This is also the time of formation of the supercontinent Columbia. A phase of basin opening followed the ∼1800 Ma event, followed by another phase of collisional event at ∼1600 Ma at the site of the Satpura-Capricorn Orogen. Subsequent evolutions of the Satpura and the Capricorn Orogens differ slightly, indicating separate evolutional history. © 2011, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

Mohanty S.,Indian School of Mines
Journal of Asian Earth Sciences | Year: 2010

The Satpura Mountain Belt (also referred as Central Indian Tectonic Zone in recent literature) forms an important morphotectonic unit in the central part of India. Some of the recent workers have reported an orogenic event at ∼1000-900. Ma (termed " Sausar orogeny" ) which led to amalgamation of the North Indian Block and the South Indian Block and formation of the Satpura Mountain Belt. In this model the stratigraphic relations of two important lithostratigraphic units on either side of the Satpura Mountain Belt (the Sausar Group in the south and the Vindhyan Supergroup on the north) are suggested to be revised from previously held ideas. Critical analyses of available published work in the region to assess the status of the Sausar Group vis a vis the Vindhyan Supergroup was carried out. It is found that the ideas proposed by the recent workers stem from an earlier interpretation that the Sausar Group has monocyclic evolution and the earliest fabric in the Sausar Group is marked by a schistosity with EW strike. Re-mapping of the gneissic rocks and adjacent matasedimentary rocks of Khawasa, Deolapar, and Kandri-Mansar areas revealed presence of gneissic rocks and granulites of two generations, and of four phases of superposed deformations in the metasediments and gneisses. The older gneisses and granulites constitute the basement over which the rocks of the Sausar Group were deposited; and the younger gneisses developed by metamorphism and migmatisation of the rocks of the Sausar Group. The latter types are found in the Khawasa-Ramakona areas. Contrary to the belief of the recent workers that no volcanic activity is present in the Sausar Group, volcanic rocks marked by amygdular basic flows and tuffs have been mapped from different parts of the Sausar Group. Migmatisation and metamorphism of these volcanic rocks (of the Sausar Group) have given rise to amphibolites and granulites in Khawasa and Ramakona areas. Therefore, the use of fabric patterns in these areas to suggest that the granulite facies metamorphism in the Ramakona-Katangi granulite domain was pre-Sausar in age is debatable.Available geochronological data of the Satpura Mountain Belt and its eastward continuation into the Chhotanagpur Gneiss terrain indicate that the basement and cover rocks of these areas were subjected to multiple deformation and metamorphic episodes of similar style and nature. The earliest deformation and metamorphism of the rocks of the Sausar Group and its equivalent rocks to the east took place at ∼2100-1900. Ma. The regional EW trend of the belt developed during the second deformation at ∼1800-1700. Ma and again at ∼1600-1500. Ma. This deformation was accompanied by migmatisation and granulite facies metamorphism in the northern domain of the Sausar Belt and in the Chhotanagpur Gneiss region. Late phase low intensity deformations in the region were associated with thermal events at ∼1100-1000. Ma and ∼900-800. Ma.The ∼EW trending fabric, referred as " Satpura orogenic trend" in Indian literature marks a major compressional tectonic event, developed during the second deformation of the Sausar Group. This has its counter part in Western Australia as the Capricorn orogeny (∼1780-1830. Ma). The development of the Satpura Mountain Belt during the Grenvillian orogeny is ruled out from the synthesis of event stratigraphic data of the region and from its comparison with the Western Australian Craton. © 2010 Elsevier Ltd.

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