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Sajdha,Jammu University | Sheikh H.N.,Jammu University | Kalsotra B.L.,Jammu University | Kumar N.,Defence Laboratory | Kumar S.,DRDO
Bulletin of Materials Science | Year: 2011

Nanocomposites of mixed oxides of iron and neodymium in polymer matrix of anilineformaldehyde are reported. The composites have been obtained by treating the aqueous solution of aniline, hydrochloric acid and formaldehyde with halide of iron and neodymium oxide. The infra-red spectra show broad peaks at ̃ 590 cm-1 and at ̃ 610 cm-1 due to the presence of oxides of both iron and neodymium. In heated samples, the absorption peaks due to metal oxides are better resolved. A broad and strong peak in XRD spectra at 2θ value of 35·69920 corresponds to spinel γ-Fe 2O3. 57Fe Mössbauer spectrum for unheated sample gives Mössbauer parameters, i.e. isomer shift (δ), quadrupole splitting (ΔE) and effective magnetic field (Heff). Transmission electron microscopy (TEM) micrographs reveal well dispersed particles at different magnifications. Vibrating sample magnetometry (VSM) studies indicate that the ferrite nanoparticles exhibit characteristics of ferromagnetism. © Indian Academy of Sciences.


Rani R.,Electroceramics Research Laboratory | Rani R.,Thapar University | Singh S.,GVM Girls College | Juneja J.K.,Hindu College | And 2 more authors.
Ceramics International | Year: 2011

Material series with compositional formula Ba0.9Sr 0.1ZrxTi1-xO3 (BSZT) were prepared by conventional solid state reaction route. XRD pattern shows that all the samples are well crystallized into perovskite structure. Tetragonality was found to decrease with increase in Zr content. Effect of substitution of Zr on dielectric constant, tangent loss and nature of transition temperature is discussed in the present paper. © 2011 Elsevier Ltd and Techna Group S.r.l.


Viswambaran M.,Military Dental Center | Arora V.,Addl DGDS | Tripathi R.C.,DRDO | Dhiman R.K.,Armed Forces Medical College
Medical Journal Armed Forces India | Year: 2014

Background: The immediate placement of implants into fresh extraction socket has proven to be a safe and predictable procedure. However, there is lack of scientific evidence regarding the healing pattern and osseointegration associated with immediate implants especially with different grafting materials. Methods: A total of 30 patients male or female, with a mean age of 23.1 years ± 6.0 in the age group of 18e38 years, each having at least one tooth indicated for extraction (either maxillary or mandibular anterior teeth) were selected and randomly divided in to two groups. 30 Implants (Xive® friadent, Germany) were placed into fresh extraction sockets during this study. Two types of graft materials namely Dembone® (freeze-dried bone allograft) for group A and G-Bone® (modified hydroxyapatite) for group B were used. After implant placement all implants were evaluated clinically and radiographically at baseline, 3 months, 6 months, 9 months and 12 months. All clinical and radiographic parameters were subjected to statistical analysis. Intragroup comparisons were made with paired 't' test and intergroup comparisons with unpaired 't' test (P > 0.05 NS, ≤0.05 S, ≤0.01 HS). Result: During the 1-year interval, no implant was lost and the mean bone level at the implants was maintained or even improved. Conclusion: Immediate restoration of single tooth implants placed in fresh extraction sockets could be considered a valuable option to replace a missing tooth. The graft materials used in both groups have been found to be equally effective. © 2012, Armed Forces Medical Services (AFMS). All rights reserved.


Kumar B.S.S.,CSE | Manjunath A.S.,SIT | Christopher S.,DRDO | Menon R.,CABS
Procedia Computer Science | Year: 2016

The scalable Video is the most suitable video format for the current day scenario where there are different varieties of electronic gadgets used to communicate and play back. As the device resolution varies, the codec designed for Scalable video (H.264/AVC) is the only solution for its support. But the challenge is in its transmission due to the limited network resources in wireless networks viz; bandwidth. This introduces jitter during video playback. This needs an effective Compression technique to reduce the possible transmission time. The paper presents a novel Adaptive Dual Tree Complex wavelet Transoform (ADT-CWT) using the efficient Motion Block Estimation (MBE), Diamond search with Large Diamond Search Path (LDSP) and a Small Diamond Search Path (SDSP). This technique effectively improves the performance of Scalable Video in wireless transmission. The PSNR and the Compression Ratio (CR) are considered for the comparison. © 2016 Published by Elsevier B.V.


Vachhani K.,Nirma University | Mallari R.A.,DRDO
2015 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2015 | Year: 2015

This paper focuses on the open source GNURadio Software and studies its use as a research tool coupled with USRP and RTL SDR. USRP, RTL SDR and GNU Radio software suite is introduced and briefly discussed. GNU Radio software suite can act as a simulation tool or a software subsystem to drive a SDR transceiver hardware. This is shown by implementing WBFM receiver using RTL SDR with GNU Radio. It concludes by comparing the cheap yet effective RTL SDR with the costly but accurate USRP hardware. © 2015 IEEE.

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