Time filter

Source Type

Gurpreet K.,Defence Research and Development Organization
2016 IEEE International Conference on Recent Trends in Electronics, Information and Communication Technology, RTEICT 2016 - Proceedings | Year: 2016

The principle of Ground Penetrating Radar (GPR) is based on the scattering of electromagnetic waves at subsurface with reflection and refraction from the buried object due to change in material. This paper deals with analysing the GPR data, todetect anti-Tank landmines buried in various conditions. This requires reading GPR data and plottingxy, yz, and zx plane and then normalizing the data followed by implementing algorithms for background removal processing &noise reduction. First normalizing a GPR data, to minimize the influences due to clutter effect, deployment method and experimental setup. Next, for the noise reduction, mean subtraction method & median filter is developed, Gaussian filter developed which helps in estimating the number of objects and image smoothing function used to reduce the noise. In this paper, anapproach is proposedfor detecting landmines buried in sand using a GPR. © 2016 IEEE.

Banerjee M.,Devi Ahilya University | Sachdev P.,Devi Ahilya University | Mukherjee G.S.,Defence Research and Development Organization
Journal of Applied Physics | Year: 2012

PVA/Co/Ag film has been prepared by sputtering Co followed by Ag in polyvinyl alcohol (PVA) matrix film by IBS technique, so as to get a 9 nm (thick) layer of Co metal nanoparticles followed by a protective 4 nm (thick) layer of Ag nanoparticles. Grazing incidence x-ray diffraction (GIXRD) pattern of the film reveals the formation of nanocrystalline Co with hcp phase. GIXRD pattern also indicates that there is no change in the crystalline structure of PVA even after sputtering of the metallic nanoparticles. The average particle size of Co nanoparticles as evaluated using Scherrer formula is found to be about 2.64 nm. UV visible absorption pattern of the film sample showed SPR peaks of Co and Ag metals in their nano size level embedded in the PVA matrix system. XPS study confirms the metallic nature of Co and Ag nanoparticles; and the depth profiling study reveals that both the metal nanoparticles have been embedded in the PVA matrix system. Surface morphology of such film has been studied using AFM; and the magnetic behaviour of the film studied by using MOKE shows soft ferromagnetic behaviour in this PVA/Co/Ag system. © 2012 American Institute of Physics.

News Article | May 16, 2016
Site: www.techtimes.com

India successfully test-fired Sunday its indigenously developed Advanced Air Defence (AAD) supersonic interceptor missile from an Abdul Kalam Island launch complex in Balasore. The advanced version of low-altitude supersonic ballistic interceptor missile was fired from the Integrated Test Range (ITR) off the Odisha coast against the naval version of Prithvi missile, which was launched off a ship anchored on the Bay of Bengal. The launch was done at about 11:15 a.m., with the interceptor roaring through trajectory and annihilating the hostile missile mid-air. “The ‘kill’ effect of the interceptor was ascertained by analysing data from multiple tracking sources,” revealed ITR director Binay Kumar Das, asserting that the interceptor missile capably destroys any hostile ballistic missile crossing its path. In what is perhaps the last in a series of developmental trials, the interceptor named Ashwin was launched almost three minutes after the target – which pretended to be an enemy missile – was fired from its host warship. Sources in the defense department said the tracking systems picked up the target, tracked it, and commanded the interceptor’s launch. The successful launch marked the 12th time that the missile was test-fired. The missile, first tested back in 2006, failed to hit its target three times. The interceptor – a 25-feet-tall, 1.2-ton (2,400 pounds) single-stage solid fuel rocket – boasts of high-tech on-board computers, navigation system, and electro-mechanical activator, to name a few. The target missile, on the other hand, is fueled by liquid propellants, stands 36 feet, and weighs 5 tons (10,000 pounds). The Indian Defence Research and Development Organization (DRDO) has produced high- and low-altitude anti-ballistic missiles, with the recent tests proving significant as the country seeks to deploy a two-layered Ballistic Missile Defence shield to fight attacks in its cities and vital installations. While the initial stage seeks to attack incoming enemy missiles outside the atmospheric region, the second stage aims to kill hostile missiles of over 2,000 kilometers (1,243 miles) in range inside the atmosphere. India was recently ranked sixth among the top military spenders in the world, allocating $51.3 billion to military expenditure in 2015. © 2016 Tech Times, All rights reserved. Do not reproduce without permission.

Haniadka R.,Father Muller Hospital Road | Rajeev A.G.,MS Ramaiah Medical College and Hospital | Palatty P.L.,Father Muller Medical College | Arora R.,Defence Research and Development Organization | Baliga M.S.,Father Muller Hospital Road
Journal of Alternative and Complementary Medicine | Year: 2012

Despite significant advances and development of novel anti-emetics, nausea and vomiting (emesis) is a major side-effect of cancer chemotherapy. At times, severe nausea and vomiting may also lead to reduction in adherence to the treatment regimen, and this will concomitantly affect the patient's survival. The rhizome of Zingiber officinale, commonly known as ginger, is globally an important spice. It has been used for centuries in the Indian, Chinese, Arabic, Tibetan, Unani, and Siddha systems of traditional medicine to treat nausea and vomiting induced by different stimuli. Preclinical studies with experimental animals (dogs and rats) have shown that the various extracts of ginger and the ginger juice possess anti-emetic effects against chemotherapy-induced nausea and vomiting. Gingerol, the active principle, is also shown to possess anti-emetic effects in minks. However, with regard to humans, while most studies have been supportive of the preclinical observations, a few have been contradictory. The exact mechanism responsible for the anti-emetic effects of ginger is unknown; however, the ginger phytochemicals, especially 6-gingerol, 8-gingerol, 10-gingerol, and 6-shogaol, may function as a 5-hydroxytryptamine (5-HT3) antagonist, NK1 antagonist, antihistaminic, and possess prokinetic effects. The present review for the first time attempts to address the anti-emetic observations and the variability in response of the anti-emetic effects of ginger in cancer chemotherapy. An attempt is also made to address the lacunae in the published studies and emphasize aspects that need further investigations for ginger to be of use in clinics as an anti-emetic agent in the future. © Copyright 2012, Mary Ann Liebert, Inc. 2012.

News Article | December 30, 2015
Site: news.yahoo.com

NEW DELHI (Reuters) - India successfully test-fired on Wednesday a new long range surface-to-air missile capable of countering aerial threats at extended ranges, as Prime Minister Narendra Modi pushes to enhance the country's military capabilities. India, which shares borders with nuclear-armed China and Pakistan, is likely to spend $250 billion over the next decade to upgrade its military. It is the world's biggest buyer of defense equipment but Modi is trying to build a defense industrial base in the country to cut overseas purchases. The test-firing of the missile system, jointly developed by India and Israel, was carried out by warship INS Kolkata, the Ministry of Defence said in a statement said. Defense industry told Reuters last year that the value of the Barak 8 project was $1.4 billion. The aerial defense system includes a radar for detection, tracking and missile guidance. Only a small club of countries including the United States, France, Britain and Israel possess such capability, a Defence Research and Development Organization spokesman said. Israel is one of India's top three arms suppliers, delivering items such as missiles and unmanned aerial vehicles, but such transactions were long largely unpublicised because of India's fear of upsetting Arab countries and its own large Muslim population.

Dhibar S.,Indian Institute of Technology Kharagpur | Sahoo S.,Indian Institute of Technology Kharagpur | Das C.K.,Indian Institute of Technology Kharagpur | Singh R.,Defence Research and Development Organization
Journal of Materials Science: Materials in Electronics | Year: 2013

In this study, we have discussed the potential of using copper chloride (CuCl2) doped Polyaniline (PANI) as an electrode material for supercapacitor application. PANI in pure and doped forms with various doping levels of CuCl2 (doping levels of 1, 2, 3 and 4 wt%) were synthesized by in situ polymerization method, using ammonium peroxodisulfate as oxidant in HCl medium. The morphology of the doped polymeric materials was studied by scanning electron microscope and transmission electron microscope analysis. The interaction between PANI and the metal cation (Cu2+) was confirmed by the fourier transform infrared spectroscopy analysis. Thermal stability of the materials was examined by thermogravimetric analysis. Electrochemical characterizations of the materials were carried out by three electrode probe method where, platinum and saturated standard calomel electrode were used as counter and reference electrode respectively. 1 M KCl solution was used as electrolyte for all the electrochemical characterizations. Among all the materials, PANI shows highest specific capacitance value at the doping level of 2 wt%. © 2012 Springer Science+Business Media, LLC.

Arundhathi R.,Indian Institute of Chemical Technology | Damodara D.,Indian Institute of Chemical Technology | Likhar P.R.,Indian Institute of Chemical Technology | Kantam M.L.,Indian Institute of Chemical Technology | And 3 more authors.
Advanced Synthesis and Catalysis | Year: 2011

A high surface, magnetic Fe3O4@mesoporouspolyaniline core-shell nanocomposite was synthesized from magnetic iron oxide (Fe 3O4) nanoparticles and mesoporouspolyaniline (mPANI). The novel porous magnetic Fe3O4 was obtained by solvothermal method under sealed pressure reactor at high temperature to achieve high surface area. The mesoporouspolyaniline shell was synthesized by in situ surface polymerization onto porous magnetic Fe3O4 in the presence of polyvinylpyrrolidone (PVP) and sodium dodecylbenzenesulfonate (SDBS), as a linker and structure-directing agent, through 'blackberry nanostructures' assembly. The material composition, stoichiometric ratio and reaction conditions play vital roles in the synthesis of these nanostructures as confirmed by variety of characterization techniques. The role of the mesoporouspolyaniline shell is to stabilize the porous magnetic Fe3O4 nanoparticles, and provide direct access to the core Fe3O4 nanoparticles. The catalytic activity of magnetic Fe3O 4@mesoporousPANI nanocomposite was evaluated in the cross-coupling of aryl chlorides and phenols. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Dwivedi P.N.,Defence Research and Development Organization | Bhattacharya A.,Defence Research and Development Organization | Padhi R.,Indian Institute of Science
Journal of Guidance, Control, and Dynamics | Year: 2011

Using the recently developed computationally efficient model predictive static programming and a closely related model predictive spread control concept, two nonlinear suboptimal midcourse guidance laws are presented in this paper for interceptors engaging against incoming high-speed ballistic missiles. The guidance laws are primarily based on nonlinear optimal control theory, and hence imbed effective trajectory optimization concepts into the guidance laws. Apart from being energy efficient by minimizing the control usage throughout the trajectory (minimum control usage leads to minimum turning, and hence leads to minimum induced drag), both of these laws enforce desired alignment constraints in both elevation and azimuth in a hard-constraint sense. This good alignment during midcourse is expected to enhance the effectiveness of the terminal guidance substantially. Both point mass as well as six-degree-of-freedom simulation results (with a realistic inner-loop autopilot based on dynamic inversion) are presented in this paper, which clearly shows the effectiveness of the proposed guidance laws. It has also been observed that, even with different perturbations of missile parameters, the performance of guidance is satisfactory.A comparison study, with the vector explicit guidance scheme proposed earlier in the literature, also shows that the newly proposed model-predictive-static-programming-based and model-predictive-spread-control- based guidance schemes lead to lesser lateral acceleration demand and lesser velocity loss during engagement. Copyright © 2010 by Radhakant Padhi.

Sonker M.K.,Defence Research and Development Organization
IEEE International Conference on Computer Communication and Control, IC4 2015 | Year: 2015

Cantilever beam is an important basic structure of micro-electro-mechanical system thermal devices. Tri-morph cantilever beam is a combination of three metals or composites bonded in stack. This paper describes the design, model and simulation of high temperature Tri-morph with piezoelectric sensing technique which works as thermal sensor. Three proposedcomposite layers namely Titanium Nitride (TiN), Beryllium Oxide (BeO) and Silicon Carbide(SiC) are arranged in order of their thermal expansion coefficients. The Tri-morph cantilever beam is embedded with piezoelectric material Barium Titanate (BaTiO3) in middle layer. To enhance the temperature range thermal insulation of ceramic Al2O3-SiO2 composition is sputtered all-around piezoelectric material BaTiO3. The structure is grown over substrate Alumina which is also thermally insulated. Bernoulli-Euler beam equation has been used for deflection and strain analysis at the point of piezoelectric sensor location. The charge conversion from strain induced using basic piezoelectric equation has been studied. The stress, deflection and piezoelectric voltage output with varying temperature have been analyzed. Verification has been performed by comparing analytic results with simulation results. With material properties and simulation results it is concluded that sensor should perform well upto temperature range of 2100K. © 2015 IEEE.

Mahanta A.K.,Defence Research and Development Organization
Asian Journal of Chemistry | Year: 2012

High field FT-qNMR (800 MHz) was used to determine the content of vinyl-1,2-unit in free radical as well as anionic hydroxyl terminated polybutadiene polymer. Two dimensional 1H/ 13C-HMQC was used to study the complex NMR spectrum. The 13C{ 1H} DEPT-135 experiment was carried out to differentiate between the methylene and methine carbon resonances. The tacticity was investigated by splitting the olefinic methylene carbons of 1,2-vinyl unit and was tested with Bernoullian and first-order Markov statistical model of chain propagation. The configurational sequence assigned to various methylene carbon resonances of the polymer are in good agreement with that calculated by the statistical models. The functionality, number-average degree of polymerization ( DP̄ n ) and molecular weight (M̄ n ) of the polymer were determined by FT-qNMR technique and the results were compared with those obtained by gel permeation chromatography.

Loading Defence Research and Development Organization collaborators
Loading Defence Research and Development Organization collaborators