Výsledky vyhledávání - "V.K. Rohatgi"

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Synthesis of nanowires and nanoparticles of cubic aluminium nitride

Autor: A. K. Das, V.P. Godbole, Sudha V. Bhoraskar, V.K. Rohatgi, C. Balasubramanian

Publikováno v: Nanotechnology. 15:370-373

Nanostructures of cubic aluminium nitride were synthesized by DC arc-plasma-induced melting of aluminium in a nitrogen?argon ambient. The material flux ejected from the molten aluminium surface was found to react with nitrogen under highly non-equili

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b379ac52821d8e6bb71780cf2189004d
https://doi.org/10.1088/0957-4484/15/3/024

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Nanophase alumina synthesis in thermal arc plasma and characterization: correlation to gas-phase studies

Autor: Sudha V. Bhoraskar, V.K. Rohatgi, S. Badrinarayanan, N. D. Sali, P. Madhu Kumar, C. Balasubramanian

Publikováno v: Materials Science and Engineering: B. 63:215-227

Nanophase alumina (Al2O3) was synthesized in a d.c. arc plasma reactor under isochronal oxygen flow conditions. Transmission electron microscopy revealed spherical particles (50 nm) and the corresponding electron diffraction showed a δ-Al2O3 phase.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8a3680e5fd6f128550f838dee2c2d15c
https://doi.org/10.1016/s0921-5107(99)00038-0

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Enhanced surface activity in nanocrystalline alumina as studied by neutron activation analysis, X-ray photoelectron and infrared spectroscopy

Autor: P. Madhu Kumar, Sudha V. Bhoraskar, S.K. Date, Vasant N. Bhoraskar, S. Badrinarayanan, P A Dokhale, V.K. Rohatgi, N. D. Sali

Publikováno v: Materials Science and Engineering: B. 49:18-26

Nanocrystalline alumina was synthesized by the gas phase condensation using the DC arc plasma technique. Spherical particles ranging in diameter between 20 and 80 nm were obtained. The stoichiometric composition of the powder was investigated by X-ra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::12934eee7c94c9ede30f38e3cf7f1fcf
https://doi.org/10.1016/s0921-5107(97)00069-x

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Synthesis and structural characterization of nanocrystalline aluminium oxide

Autor: Sudha V. Bhoraskar, V.K. Rohatgi, P. Singh, P. Madhu Kumar, Murali Sastry, Pramod H. Borse

Publikováno v: Materials Chemistry and Physics. 36:354-358

Nanocrystalline alumina (Al 2 O 3 ) powder has been synthesized by the d.c. arc plasma method at atmospheric conditions using aluminium electrodes. Structural characterization by X-ray diffraction and transmission electron microscopy confirmed the ul

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::351443c36aac64461e739cd436fba43d
https://doi.org/10.1016/0254-0584(94)90054-x

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Gamma-ray attenuation method for void fraction measurement in fluctuating two-phase liquid metal flows

Autor: T.K. Thiyagarajan, N. Venkatramani, V.K. Rohatgi, N.S. Dixit, P. Satyamurthy

Publikováno v: Measurement Science and Technology. 2:69-74

Void fraction measurements are made by the gamma -radiation attenuation method in mercury-air two-phase flow systems. To measure the void fraction with an accuracy of the order of 5%, the required gamma -ray source and the strength of the source is e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::18f20f31c923126c6af536c6f8d95b4b
https://doi.org/10.1088/0957-0233/2/1/011

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Switching characteristics of a gas trigatron operated in single and double trigger mode

Autor: K. Nanu, V.K. Rohatgi, S. T. Iyengar, P. H. Ron

Publikováno v: IEEE Transactions on Electrical Insulation. 25:381-392

The delay time, risetime, jitter, and operating range have been studied in detail for single- as well as double-trigger mode. The best switching performance is obtained in a double-trigger mode for a trigger polarity configuration that produces high

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a34a215ce77f22d7864440beff2a3ae7
https://doi.org/10.1109/14.52388

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Solid state reaction kinetics in the alumina-slag system

Autor: J. Karthikeyan, V.K. Rohatgi

Publikováno v: Materials Science and Engineering: A. 123:141-144

Studies on the reaction of solid slag with alumina show that the diffusion reaction does not produce any new phase but proceeds by forming a series of solid solutions. Although alumina-slag is a multicomponent system, the diffusion process and concen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::230d2a0e57e8a88954d142c3283406f8
https://doi.org/10.1016/0921-5093(90)90219-s

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Structure and ionic conductivity of solid solutions in the system 0·9{(ZrO2)1−x-(CeO2)x}-0·1(Y2O3)

Autor: V.K. Rohatgi, P.V. Ananthapadmanabhan, N. Venkatramani, A.C. Momin, K.S. Venkateswarlu

Publikováno v: Journal of the European Ceramic Society. 6:111-117

Solid solutions in the ternary system ZrO 2 -CeO 2 -Y 2 O 3 , by virtue of their high-temperature stability and good electrical conductivity, have potential application in many advanced technologies such as the magnetohydrodynamic (MHD) generator. Th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::997e4a82b4fffc1f8bc56daf1265cc80
https://doi.org/10.1016/0955-2219(90)90044-g

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