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The Soft X-ray focusing Telescope (SXT), India’s first X-ray telescope based on the principle of grazing incidence, was launched aboard the AstroSat and made operational on October 26, 2015. X-rays in the energy band of 0.3–8.0 keV are focussed on to a cooled charge coupled device thus providing medium resolution X-ray spectroscopy of cosmic X-ray sources of various types. It is the most sensitive...
We tuned the magnetic properties of iron-filled multi-walled carbon nanotubes (Fe@CNTs) by careful manipulation of the synthesis parameters in a two zone furnace. Due to the small dimensions of iron filling in these samples they have some of the highest values of magnetization saturation reported for Fe@CNTs. Magnetic characterization of the Fe@CNTs revealed that their coercivity can be systematically...
We report the encapsulation of the antiferromagnetic and magnetoelectric oxide Cr 2 O 3 inside both multi - and single-walled carbon nanotubes. This is achieved by a two step post-synthesis filling process which involves the filling of nanotubes with CrO 3 either from aqueous solution or from the molten phase, followed by appropriate annealing sequences. TEM imaging confirms...
Wavelet Packet Modulation (WPM) is a multicarrier modulation technique like the well-established Orthogonal Frequency Division Multiplexing (OFDM). The channel equalization of WPM is important and unique due to the symbol overlap in time. In this article we present a time-domain equalizer for the compensation of channel induced distortions on the WPM transmission. The equalizer applies the principle...
In this paper, we present novel results on polarization study for Ultra-WideBand (UWB) wireless channel in indoor environments. The measurements were conducted for Line of Sight (LOS) and Non-Line of Sight (NLOS) scenarios in indoor office environments covering a large frequency band from 2–6 GHz. Given the large band and the importance of UWB propagation parameters including polarization, the results...
In this paper, we demonstrate the complementary nature of audio-specific excitation source (subsegmental) information present in the linear prediction (LP) residual, to the information derived using spectral (segmental) features, for audio clip classification. Classes considered for study are advertisement, cricket, cartoon, football and news, and the data is collected from TV broadcast with large...
The importance of utilising biometrics to establish personal authenticity and to detect impostors is growing in the present scenario of global security concern. Development of a biometric system for personal identification, which fulfills the requirements for access control of secured areas and other applications like identity validation for social welfare, crime detection, ATM access, computer security,...
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