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Awasthi A.K.,Gautam Buddha University | Srivastava K.,Central Institute of Plastic Engineering and Technology
Journal of Medical Systems | Year: 2013

In recent years, the increased availability of lower-cost telecommunications systems and customized patients monitoring devices made it possible to bring the advantages of telemedicine directly into the patient's home. These telecare medicine information systems enable healthcare delivery services. These systems are moving towards an environment where automated patient medical records and electronically interconnected telecare facilities are prevalent. Authentication, security, patient's privacy protection and data confidentiality are important for patient or doctor accessing to Electronic Medical Records (EMR). A secure authentication scheme will be required to achieve these goals.Many schemes based on cryptography have been proposed to achieve the goals. However,many schemes are vulnerable to various attacks, and are neither efficient, nor user friendly. Specially, in terms of efficiency, some schemes are resulting in high time cost. In this paper we propose a new authentication scheme that is using the precomputing to avoid the time-consuming exponential computations. Finally, it is shown to be more secure and practical for telecare medicine environments. © Springer Science+Business Media New York 2013. Source

Nalini R.,Central Institute of Plastic Engineering and Technology | Nagarajan S.,CSIR - Central Leather Research Institute | Reddy B.S.R.,CSIR - Central Leather Research Institute
Journal of Experimental Nanoscience | Year: 2013

Intercalated/exfoliated nanocomposites of thermoplastic polyolefin (TPO) blended nanoclay (Cloisite 20 A and Cloisite 30B) were fabricated using melt extrusion process. Polypropylene grafted maleic anhydride (PP-g-MA) was used as a compatibiliser to improve the dispersibility of clay. TPO/nanoclay composites were prepared with different percentages of clay loading (3, 5 and 7 wt%) by adding PP-g-MA as a compatibiliser. The nanocomposites having 5 wt%C20A/5 wt% compatibiliser exhibited a remarkable improvement in mechanical (tensile modulus, flexural modulus and impact strength) and thermal (heat distortion temperature, HDT) properties. The thermal measurements have been carried out by differential scanning calorimetry, thermogravimetric analysis and HDT methods. Dynamic mechanical analysis studies indicated that PP macromolecules were intercalated or exfoliated between the interlayer of silicates. The morphology of nanocomposites was characterised by scanning electron microscopy (SEM) and X-ray diffraction (XRD) was used to find out the arrangement of crystals in the nanocomposites. The SEM and XRD clearly demonstrated the progressive break up of particles and results in decreased particle size with the optimised combination. © 2013 Copyright Taylor and Francis Group, LLC. Source

Shukla D.,Indian Institute of Technology Roorkee | Negi Y.S.,Indian Institute of Technology Roorkee | Uppadhyaya J.S.,Indian Institute of Technology Roorkee | Kumar V.,Central Institute of Plastic Engineering and Technology
Polymer Reviews | Year: 2012

Synthetic aromatic polyarylether ketones are known for their high performance applications. Poly(ether ether ketone) is an important material which is most widely used in such aggressive environments as nuclear plants, oil and geothermal wells, chemical plants, and high-pressure steam valves. Considering the wide range of properties of PEEK polymers, a variety of structurally modified PEEK polymers are also reported. This review covers the detail of different synthetic and modification procedure, the characterization technique applied on PEEK. In brief, morphological and related properties are also described. © 2012 Taylor & Francis Group, LLC. Source

Santhoskumar A.U.,Central Institute of Plastic Engineering and Technology
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2014

Low density polyethylene films blended (LDPE) with mixed Ferrous ricinoleate maleic dextrose additive have been exposed to accelerated UV and biotic environments. The films were accelerated UV light for 70 h before being mixed with water and municipal solid compost. The photo degraded and biodegraded LDPE films were examined by infrared spectroscopy and also to study the photodegraded film attacked by mitochondria β oxidation process of microorganism and its morphological study by SEM analysis and degree of crystallinity behaviour by XRD analysis. © 2013 Springer Science+Business Media New York. Source

Dabhi S.,Maharaja Krishnakumarsinhji Bhavnagar University | Mankad V.,Central Institute of Plastic Engineering and Technology | Jha P.K.,M. S. University of Baroda
Journal of Alloys and Compounds | Year: 2014

The present paper reports a detailed and systematic theoretical study of structural, mechanical, electronic, vibrational and thermodynamical properties of three beryllium chalcogenides BeS, BeSe and BeTe in zinc blende, NiAs and rock salt phases by performing ab initio calculations based on density-functional theory. The calculated value of lattice constants and bulk modulus are compared with the available experimental and other theoretical data and found to agree reasonably well. These compounds are indirect wide band gap semiconductors with a partially ionic contribution in all considered three phases. The zinc blende phase of these chalcogenides is found stable at ambient condition and phase transition from zinc blende to NiAs structure is found to occur. The bulk modulus, its pressure derivative, anisotropic factor, Poission's ratio, Young's modulus for these are also calculated and discussed. The phonon dispersion curves of these beryllium chalcogenides in zinc blende phase depict their dynamical stability in this phase at ambient condition. We have also estimated the temperature variation of specific heat at constant volume, entropy and Debye temperature for these compounds in zinc blende phase. The variation of lattice-specific heat with temperature obeys the classical Dulong-Petit's law at high temperature, while at low-temperature it obeys the Debye's T3law. © 2014 Elsevier B.V. All rights reserved. Source

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