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Samraj Lawrence T.,Francis Xavier Engineering College | Seenivasagam V.,National Engineering College
Asian Journal of Information Technology

The emerging recent technology of Wireless Sensor Network (WSN) is projected to offer a wide range of real-time applications such as battle field surveillance in military, environmental condition monitoring, security system, smart spaces and so on. In this scenario one of the main problems is coverage area of the network. Many researches are focusing on hole detection and healing in coverage area of WSN. This study also indent to deal with the effort of hole detection and healing in such kind of environments. The proposed approach requires no location information and works even for dense networks. This proposed algorithm is called robot repair algorithm for automatic hole detection and healing. It is a modified method for hole detection and healing that might eliminate the drawbacks of the existing algorithms. There are three phases involved in this method, namely information collection phase where each node exchanges information to build a list of x-hop neighbors, path construction phase where communication links between sensor nodes in the list of x-hop neighbors are identified and finally path checking phase where paths are examined to infer boundary and inner nodes. Unlike the existing algorithms, the proposed method uses the same algorithm for both hole detection and healing which provides better efficiency, high packet delivery ratio, improved network life time, reduced delay and throughput. Hole attacks in WSN environments are also highlighted. © Medwell Journals, 2016. Source

Mohan S.M.,Alagappa Chettiar College of Engineering And Technology | Rajagopal K.,Francis Xavier Engineering College
International Journal of Environmental Engineering

In this study, day and night dry deposition samples were collected with Eagle II arrangement of dry deposition plates. Karaikudi, one of the medium level city in India has been the chosen as area of study. Sampling locations were classified as zone1, zone2 and zone3. Wind speed was also recorded during sampling. Particle size was determined by using X-ray diffractometer (XRD). Relation between particle size and dry deposition flux was also established. Different polynomials were tried to find out the best correlation between particle size and the dry deposition flux. Overall dry deposition velocity was calculated by taking slope of regression line between dry deposition flux and ambient concentration. Better correlation between wind speed and dry deposition flux was obtained during April ’08. The resultant correlation coefficient (R) was found to be 0.8401 and 0.7295 for day and night respectively for a linear relationship. Using the collected data, dry deposition velocity model was developed by which correlation coefficient (R) between modelled dry deposition velocity and calculated dry deposition velocity was arrived as 0.9981. The present methodology would eliminate the enormous task of collecting the ambient dry deposition air sample and particle concentration and analyse the same in the laboratory. © 2012 Inderscience Enterprises Ltd. Source

Madhu P.,RVS Technical Campus Coimbatore | Neethi Manickam I.,Francis Xavier Engineering College | Kanagasabapathy H.,National Engineering College
Proceedings of the National Academy of Sciences India Section A - Physical Sciences

In this study the flash pyrolysis of the cotton shell on the electrically heated fluidized bed has been conducted for producing cotton shell pyrolytic oil and with the presence of homogenous acid catalyst the cotton shell pyrolytic oil is converted into biofuel. Cotton shell was procured from resources available in India. The various physical properties such as density, viscosity, flash point and elemental analysis have been done for the bio oil. For the baseline data analysis, the same characteristics study has been carried out on the biofuel and an acceptable agreement is observed. © 2015, The National Academy of Sciences, India. Source

Hansen R.S.,Francis Xavier Engineering College | Narayanan C.S.,National Engineering College | Murugavel K.K.,National Engineering College

In this paper the performance of an inclined type solar still was experimentally investigated using different wick materials on different absorber plate configurations. In this work, the new materials are characterised for absorption, capillary rise, porosity, water repellence and heat transfer co-efficient to select a suitable material for the solar desalination application. Different wick materials are chosen for this analysis. Based on this analysis, water coral fleece material with porosity (69.67%), absorbency (2s), capillary rise (10mm/h) and heat transfer coefficient (34.21W/m2°C) is the most suitable wicking material for higher productive solar still. Performances of the still were compared with different wick materials (wood pulp paper wick, wicking water coral fleece fabric and polystyrene sponge) on the various absorber plate configurations (flat absorber, stepped absorber and stepped absorber with wire mesh). Maximum distillate achieved in the still was 4.28l/day by using water coral fleece with weir mesh-stepped absorber plate. © 2014 Elsevier B.V. Source

Masilamani S.,KS Rangasamy College of Technology | Musthafa A.M.,Francis Xavier Engineering College
Microchemical Journal

In recent times semiorganic nonlinear optical material is a forefront of current research because of its importance to providing key functions of frequency conversion, light modulations and optical memory storage. Most of the organic materials have inadequate transparency, poor optical quality and low laser damage threshold. Inorganic materials have excellent mechanical and thermal properties but they possess relatively modest nonlinearity. Semiorganic materials which have combined properties of both organic and inorganic materials. In this coordination complex the organic ligand plays an important role for the nonlinear optical property. Nowadays, amino acids are more suitable organic materials for nonlinear optical applications because they contain dipolar nature due to the presence of a protonated amino group (NH3 +) and deprotonated carboxylic group (COO-). In the present study l-asparagine lithium chloride (LALC) was grown from aqueous solution by slow evaporation method. The crystalline perfection of the material was confirmed by powder X-ray diffraction. The lattice parameters were calculated by single crystal X-ray diffraction and it was found to be the LALC crystallized in orthorhombic crystal system with noncentro symmetric space group of Pna21 which is one of the essential parameters in nonlinear optical materials. The optical transparency was analyzed by UV-vis transmission spectral study and it was found to be of lower cut off wavelength of the grown crystal which is 234nm. The presence of functional groups was identified by FTIR spectral analysis. The percentage of carbon, hydrogen and nitrogen in the crystal was calculated by chemical analysis and compared with its theoretical values. The mechanical strength was calculated by Vickers microhardness tester. The nonlinear optical efficiency of the crystal was estimated by using Kurtz Perry powder technique and it was found to be 2.08 times that of potassium dihydrogen phosphate (KDP) due to noncentro symmetric space group of good nonlinear optical material. Hence, LALC crystal is more suitable for the fabrication of optoelectronic devices. © 2013 Elsevier B.V. Source

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