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.
Sahu A.,Central Institute of Plastic Engineering and Technology |
Yadav N.,Oriental Institute of Technology |
Sudhakar K.,Maulana Azad National Institute of Technology
Renewable and Sustainable Energy Reviews | Year: 2016
The noticeable rise in the electricity demand, fast depletion of fossil fuels, along with environmental concerns throughout the world has led to the requirement of commissioning Solar PV plants in large scale. Solar photovoltaic (PV) installation has the burden of intense land requirements which will always be a premium commodity. To conserve the valuable land & water, installing Solar PV system on water bodies like oceans, lakes, lagoons, reservoir, irrigation ponds, waste water treatment plants, wineries, fish farms, dams and canals can be an attractive option. Floating type solar photovoltaic panels have numerous advantages compared to overland installed solar panels, including fewer obstacles to block sunlight, convenient, energy efficiency, higher power generation efficiency owing to its lower temperature underneath the panels. Additionally, the aquatic environment profits by the solar installation because the shading of the plant prevents excessive water evaporation, limits algae growth and potentially improving water quality. This paper gives more insight about the Floating PV technology, its present status & various design options. © 2016 Elsevier Ltd
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.
Muppalla R.,Indian Central Salt and Marine Chemicals Research Institute |
Rana H.H.,Indian Central Salt and Marine Chemicals Research Institute |
Devi S.,Central Institute of Plastic Engineering and Technology |
Jewrajka S.K.,Indian Central Salt and Marine Chemicals Research Institute
Applied Surface Science | Year: 2013
A new approach for the surface modification of polymer membranes prepared by phase inversion technique for antifouling properties is reported. Direct deposition of poly(2-dimethylaminoethyl methacrylate)-b-poly(methyl methacrylate)-b-poly(2-dimethylaminoethyl methacrylate) (PDMA-b-PMMA-b-PDMA) copolymer micelles (core-shell) and gel formed from mixture of polyvinyl alcohol (PVA) and PDMA-b-PMMA-b-PDMA on the polysulfone (PSf-virgin) ultrafiltration membrane surface successfully provides modified membranes with improved antifouling properties and pH-responsive behaviour during both water and protein filtrations. Successful deposition and adsorption of such type of micelle and gel particles on the membrane surface was assessed by combination of SEM, AFM, contact angle, ATR-IR, and zeta potential measurements. The micelle and gel particles preferentially remained on the membranes surface due to their bigger size than the pores on the skin layer and also due to adsorption on the membrane surface by hydrophobic interaction. The modified membranes exhibited much higher rejection of macromolecules and almost steady trend in flux compared to corresponding virgin membranes during filtration operation. The major advantage of this protocol is that the deposited micelles and gel remained on the membrane surface even after filtration and storage of the membrane in water and the modified membranes retained similar performance. The effect of all the micelles and gel components on the membrane performance has been elucidated. © 2012 Elsevier B.V.
Mohanty S.,Central Institute of Plastic Engineering and Technology |
Nayak S.K.,Central Institute of Plastic Engineering and Technology
Journal of Polymers and the Environment | Year: 2012
The present article summarizes the development of poly(butylene adipate-co-terephthalate) (PBAT) and organically modified layered silicates nanocomposite using a co-rotating twin screw extruder having a blown film unit. Wide angle X-ray diffraction (WAXD) studies indicated an increase in d spacing of the nanoclays in the bio-nanocomposite hybrids revealing formation of intercalated morphology. Transmission Electron Microscopy (TEM) also confirmed presence of partially exfoliated clay galleries as well as layers of intercalated structures within the PBAT matrix in the nanocomposite. Mechanical tests showed that the nanocomposite hybrids prepared using B109 nanoclay exhibited higher tensile modulus. Functionalization of PBAT matrix upon grafting with maleic anhydride (MA) resulted in further improvement in mechanical properties. The existence of interfacial bonds in grafted bio-nanocomposite hybrids are substantiated using FTIR spectroscopy. Thermal properties of nanocomposite hybrids employing DSC, TGA also revealed improved T g, T c and thermal stability over the virgin polymer. Dynamic Mechanical Analysis (DMA) indicated an increase of storage modulus (E′) of PBAT biopolymer with incorporation of nanofiller. The biodegradability of PBAT bionanocomposite hybrids showed an increase in the rate of biodegradability with addition of Na +MMT due to hydrophilic nature of the nanoclay. © 2012 Springer Science+Business Media, LLC.
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.
Mohanty S.,Central Institute of Plastic Engineering and Technology |
Nayak S.K.,Central Institute of Plastic Engineering and Technology
Journal of Thermoplastic Composite Materials | Year: 2010
Poly(methyl methacrylate) (PMMA)/layered silicate nanocomposites were prepared using melt intercalation technique. Commercially modified nanoclays such as Cloisite 30B (C30B), Cloisite 20A (C20A), and Bentone 109 (B109) have been used as organoclays for the preparation of nanocomposites. PMMA matrix has been grafted with maleic anhydride to modify the interfacial region and improve the interfacial adhesion between organoclays and PMMA matrix. Mechanical tests revealed an increase in the tensile modulus of PMMA/C30B (5%) nanocomposite to about 35% as compared to virgin PMMA matrix. Thermal measurements employing differential scanning calorimetry and thermogravimetric analysis also showed improved thermal stability and marginal increase in Tg of PMMA matrix with the incorporation of nanoclays. Wide angle X-ray diffractograms revealed an increase in d-spacing of C30B nanoclay from 18.5 to 39.4 Å in PMMA/C30B nanocomposites, thus confirming intercalated structure. The dispersion characteristics of organoclay within PMMA matrix was also investigated using transmission electron microscopy. Furthermore, dynamic mechanical analysis shows a substantial increase in storage modulus of PMMA matrix with the incorporation of organoclays. Additionally, an improved fire retardancy of PMMA was also observed in PMMA/B109 (5 wt%) nanocomposites with an evidence of reduced horizontal rate of burning. © The Author(s), 2010.
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.
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.
Velmurugan S.,Central Institute of Plastic Engineering and Technology |
Santhoskumar A.U.,Central Institute of Plastic Engineering and Technology |
Palanivelu K.,Central Institute of Plastic Engineering and Technology
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2011
A new additive Cobalt (Co) 12-hydroxyoleate was successfully synthesized and blended with starch their performance on the photodegraded low density polyethylene film was subjected to biodegradation in the presence of the microbes such as asspergillusniger and pencillium funculosum isolated from a dump. Fragments occur progressively in the biodegradation of the photodegradaded films. Moreover, the biodegradation test results reveal that 24% of the material degradation at the end of 45 days. This Cobalt 12 hydroxyloleate blended with LDPE film has been exposed to abiotic and biotic environments. The abiotic degradable of the films were UV irradiated for periods of maximum within 120 hours of LDPE in different percentage before being mixed with water and organic fraction municipal solid compost were examined by infrared spectroscopy. The carbonyl peak increased with time in the abiotic environment and the oxidative degradation. In the presence of a biotic environment however, this peak decreased. At the same time there was an increase in double bonds which was related to weight loss. This mechanism is compared, on the one hand, with abiotic photoxidation, Norrish type I degradation and on the other with biotic polyolefin's degradation to produce double bond formation find out peak in FTIR. So it is proxidante and bioactive LDPE Cobalt 12hydroxyloleate degradable simply.