• S S Desai

      Articles written in Pramana – Journal of Physics

    • Comparative evaluation of methods for precise determination of oxygen stoichiometry in highTc oxides

      T S Krishnamoorthy N Mahadevan S S Desai C C Dias

      More Details Abstract Fulltext PDF

      A comparative study of the methods for oxygen stoichiometry—direct inert gas fusion method and two indirect iodometric methods—has been carried out. The indirect iodometric method in which Cu(III) is directly estimated, has been found to be more precise. Several samples of YBa2Cu3Ox of varyingx, their fluorine-substituted counterparts and also Bi2Sr2Ca1Cu2Ox and Tl2Ba2Ca1Cu2Ox have been analysed.

    • Design and performance of a 2-D multi-wire position sensitive X-ray detector

      S S Desai J N Joshi A M Shaikh

      More Details Abstract Fulltext PDF

      A 2-D multi-wire position sensitive detector for X-ray diffraction and small angle X-ray scattering studies is described. The detector has an active area of 100 mm × 100 mm and consists of an anode plane with 10 µm SS wires at 3 mm spacing and a pair of orthogonal cathode readout planes with 25 µm SS wires placed at 1.5 mm spacing. The position information is obtained using charge division method and recorded using a laboratory built data acquisition system. The resolution and gas gain was measured for 5.9 keV X-rays (55Fe-source) as a function of the anode wire voltage and gas pressure. It was observed that the proportional region of the PSD at 100 kPa pressure extended up to a high voltage value of around 1.5 kV and it shifted to high values up to 2 kV for gas pressure of 300 kPa. The energy resolution improved from 18% (FWHM) to 12% with increase in pressure. The spatial resolution of the PSD also showed improvement, with a value of 1.2 mm × 1.4 mm at 300 kPa gas pressure. A maximum gain of 5 × 104 is obtained.

  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.