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Khanna R.,Saving Newborn Lives | Khanna R.,Institute for Child and Family Health | Karikalan N.,National Dairy Research Institute | Mishra A.K.,Combat Vehicles Research and Development Establishment | And 3 more authors.
BMC Public Health | Year: 2013

Background: Quality and essential health information is considered one of the most cost-effective interventions to improve health for a developing country. Healthcare portals have revolutionalized access to health information and knowledge using the Internet and related technologies, but their usage is far from satisfactory in India. This article describes a health portal developed in India aimed at providing one-stop access to efficiently search, organize and share maternal child health information relevant from public health perspective in the country. Methods. The portal 'Repository on Maternal Child Health' was developed using an open source content management system and standardized processes were followed for collection, selection, categorization and presentation of resource materials. Its usage is evaluated using key performance indicators obtained from Google Analytics, and quality assessed using a standardized checklist of knowledge management. The results are discussed in relation to improving quality and access to health information. Results: The portal was launched in July 2010 and provides free access to full-text of 900 resource materials categorized under specific topics and themes. During the subsequent 18 months, 52,798 visits were registered from 174 countries across the world, and more than three-fourth visits were from India alone. Nearly 44,000 unique visitors visited the website and spent an average time of 4 minutes 26 seconds. The overall bounce rate was 27.6%. An increase in the number of unique visitors was found to be significantly associated with an increase in the average time on site (p-value 0.01), increase in the web traffic through search engines (p-value 0.00), and decrease in the bounce rate (p-value 0.03). There was a high degree of agreement between the two experts regarding quality assessment carried out under the three domains of knowledge access, knowledge creation and knowledge transfer (Kappa statistic 0.72). Conclusions: Efficient management of health information is imperative for informed decision making, and digital repositories have now-a-days become the preferred source of information management. The growing popularity of the portal indicates the potential of such initiatives in improving access to quality and essential health information in India. There is a need to develop similar mechanisms for other health domains and interlink them to facilitate access to a variety of health information from a single platform. © 2013 Khanna et al.; licensee BioMed Central Ltd. Source

Saikia A.,Indian Defence Research And Development Laboratory | Sivabalan R.,Combat Vehicles Research and Development Establishment | Gore G.M.,Explosives Research & Development Laboratory | Sikder A.K.,Explosives Research & Development Laboratory
Propellants, Explosives, Pyrotechnics | Year: 2012

This paper reports a novel microwave-assisted method for the synthesis of potential high explosives (HEs) such as 3-nitro-1,2,4-triazol-5-one (NTO), bis-(2,2-dinitropropyl) nitramine (BDNPN), 4-nitroimidazole (4-NI) and 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20). The high temperature thermal rearrangement of 1,4-dinitroimidazole to 2,4-dinitroimidazole was also reported using microwave radiation as heating source. The synthesized compounds were characterized by spectroscopic techniques and the data obtained confirmed their structures. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Ezilarasan C.,Anna University | Senthil Kumar V.S.,Anna University | Velayudham A.,Combat Vehicles Research and Development Establishment | Palanikumar K.,Sri Sairam Institute of Technology
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2011

The effects of the cutting parameters (cutting speed, feed rate and depth of cut) on the surface roughness in machining the Nimonic C-263 alloy were investigated. The experiments were conducted using Taguchi's experimental design. The effect of cutting parameters on surface roughness was evaluated and the optimum cutting conditions for minimizing the surface roughness were determined. A second order model was established between the cutting parameters and surface roughness, using the response surface methodology. The experimental results revealed that among the parameters considered, the feed rate is the most significant which influences the surface roughness, followed by the cutting speed. The predicted values and measured values are fairly close, which indicates that the developed model can be effectively used to predict the surface roughness in machining the Nimonic C-263 alloy. The predicted values are validated using the additive law. © 2011 The Nonferrous Metals Society of China. Source

Nagesh S.,Combat Vehicles Research and Development Establishment | Junaid Basha A.M.,Combat Vehicles Research and Development Establishment | Singh T.D.,Indian Defence Institute of Advanced Technology
Journal of Mechanical Science and Technology | Year: 2015

The high speed flexible coupling (HSFC) is used on the fighter aircraft gas turbine engines utilizing non-lubricated, metallic flexible plates. The HSFC has to transmit power at high speeds typically ranging from 10,000 to 18,000 rpm from engine gear box to accessory gear box. The HSFC also accommodates large axial and lateral misalignments due to thermal expansion and flight dynamics. The imposed angular and axial displacement distorts or bends the flexible plates. To achieve an infinite life design for HSFC, it is necessary to keep away from the different natural frequencies from the operating range of speeds apart from the optimal structural strength to accommodate larger misalignment. This paper discusses about details of system analysis, design and evaluation of HSFC for gas turbine engines. The dynamic characteristics of the HSFC are investigated through the finite element analysis (FEA) and experimental verification. The present approach can be extended for the development of similar type of flexible couplings. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg. Source

Nagesh S.,Combat Vehicles Research and Development Establishment | Junaid Basha A.M.,Combat Vehicles Research and Development Establishment | Thakur D.,Indian Defence Institute of Advanced Technology
Journal of Failure Analysis and Prevention | Year: 2015

The high speed flexible coupling (HSFC) transmits power from the aircraft engine gear box to the accessory gear box operating at high speed ranging from 10,000 to 18,000 rpm. The HSFC utilizes a series of thin annular, titanium alloy flexible plates, to accommodate larger parallel and axial misalignment that arises on the drive line. During ground testing, failure of flexible plate was observed. As a part of the failure analysis the extensive metallographic studies were done. This study showed that, failure was caused by the presence of Electron beam weld spatter on flexible plate, which was a crucial factor to the fatigue crack initiation phase. In order to complement the cause of failure, a 3D crack propagation simulation by FEA was done to predict the critical flaw size. This combined failure cause analysis approach has served as an efficient tool for optimized product development. © 2015, ASM International. Source

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