31 Result(s)

Article

Soft classification for sub-pixel land cover extraction

With increasing resolution of the remotely sensed data the problems of images contaminated by mixed pixels arc frequent. Conventional classification techniques often produce erroneous results when applied to i...

R. S. Tiwari, Manoj K. Arora, T. Kailash in Journal of the Indian Society of Remote Sensing (1999)

Article

Diagnostic role of ultrasonography in neck swellings

Diagnostic Role of Ultrasonography in Neck Swellings The study of ultrasonographic features of various neck swellings in fifty patients was done. There were 22 thyroid and thyroid related swelling, 8 salivary ...

Alka Goyal, R. S. Tiwari, A. A. Desai in Indian Journal of Otolaryngology and Head … (1999)

Article

Some new structural and electronic characteristics of quasicrystals

The quasicrystals being based on quasiperiodic order other than crystal like periodic translational order and embodying self similarity, present unique condensed matter phases. In addition to their curious str...

O N Srivastava, R S Tiwari, N P Lalla, R K Mandal… in Bulletin of Materials Science (1999)

Article

On the new structural phases in Al₆₅Cu₂₀Cr₁₅ quasicrystalline alloy

The quasicrystalline (qc) alloy Al₆₅Cu₂₀Cr₁₅, unlike its Ru- and Fe-bearing counterparts like Al₆₅Cu₂₀Ru₁₅ and Al₆₅Cu₂₀Fe₁₅, is a metastable phase. This qc alloy has been shown to possess several structural varia...

Varsha Khare, N. P. Lalla, R. S. Tiwari, O. N. Srivastava in Journal of Materials Research (1995)

Article

Electrical conductivity and structural behaviour of Al₆₅Cu₂₀Ru₁₅ quasicrystalline alloy

The low temperature conductivity σ (T) and the magnetoresistance (up to 8 T) of a phason disorder free pure Al₆₅Cu₂₀Ru₁₅ quasicrystalline alloy, prepared by melt casting, has been investigated in the temperature ...

N. P. Lalla, R. S. Tiwari, O. N. Srivastava… in Zeitschrift für Physik B Condensed Matter (1995)

Article

Approximant twins in a titanium-iron-silicon alloy

P. Mandal, R. K. Mandal, R. S. Tiwari… in Journal of Materials Science Letters (1994)

Article

Coherent orientation relationship among various quasicrystalline and crystalline phases in rapidly solidified Al₇₈Mn₂₀Ge₂ alloy

Rapidly solidified Al₇₈Mn₂₀Ge₂ alloy exhibits a curious structural feature; this corresponds to the simultaneous occurrence of almost all the quasicrystalline phases, e.g., primitive and face-centered icosahedral...

N. P. Lalla, R. S. Tiwari, O. N. Srivastava in Journal of Materials Research (1992)

Article

Electron microscopic observations of Bi and Tl bearing cuprate high temperature superconductors

The second generation of high temperature superconductors typified by Bi₂Sr₂Ca _n−1Cu _n O_2n+4 and Tl₂Ba₂Ca _n−1Cu _{n ...}

B Das, K Ramakrishna, G D Verma, R S Tiwari… in Bulletin of Materials Science (1991)

Article

Preparation of Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O superconducting films by conventional techniques

High temperature superconducting films of Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O have been deposited on different substrates using conventional techniques, like flash evaporation and spray pyrolysis. The microstructural ...

K K Verma, A K Saxena, S Rastogi, R S Tiwari… in Bulletin of Materials Science (1991)

Article

Kinetics of two-stage crystallization in Metglas 2826A

Crystallization kinetics of MSI and MSII stages in Metglas 2826A has been investigated by quantitative transmission electron microscopy. The volume fraction of crystallization against time curve has been found...

R. S. Tiwari, J. C. Claus, S. Ranganathan in Journal of Materials Science (1989)

Article

Tympanometric evaluation of S.O.M.

A study involving 100 patients encompassing both tympanometric and surgical evaluation of 161 ears is presented.

V. J. Moradia, R. B. Udwadia, R. S. Tiwari in Indian Journal of Otolaryngology (1984)