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Pawade V.B.,Laxminarayan Institute of Technology | Dhoble N.S.,Sevadal Mahila Mahavidyalay | Dhoble S.J.,RTMNU
Materials Research Express | Year: 2015

RE3+ (RE3+Q=QEu3+,Dy3+ and Ce3+) doped Ca3Al2Si3O12 phosphors are prepared at 600 °Cby a combustion method. The phase and crystallanity of the synthesized materials is investigated by X-ray diffraction. Luminescence characteristics were analyzed by using photoluminescence spectra. Here Ca3Al2Si3O12: Eu3+ phosphor shows strong emission bands at 581, 592, 615 under 396 nmexcitation wavelengths. Dy3+ emission band is observed at, 437, 484, 577 under 348 nmexcitation wavelength. Whereas Ce3+ shows isolated blue emission bands at 440 nmkeeping excitation wavelength constant at 355 nm. Also spin-orbit splitting difference in 2F7/2 and 2F5/2 ground state level of Ce3+ ions is studied using curve fitting analysis. Thus, the present phosphor may applicable for near ultraviolet excited white light emitting diode. © 2015 IOP Publishing Ltd. Source

Khedikar R.,RTMNU | Kapur A.,MGI
Proceedings of the 2014 International Conference on Issues and Challenges in Intelligent Computing Techniques, ICICT 2014 | Year: 2014

In commercial development and research the growth of Wireless sensor networks are very fast. Target coverage is one of the most active areas of research in wireless sensor networks. Coverage in wireless sensor networks is usually defined as a measure of how well and how long the sensors are able to observe the physical space. Several nodes deployments and design based has been developed depending upon the requirement of the applications and requirements. The deployment of node is generally application based either deterministic or randomized but in both cases target coverage is impotent issue in WSNs. The different placement techniques available in wireless sensor networks. In this paper we address the problem like minimum number of sensors required to construct cover the total area with a given required lifetime of the sensors. In this paper we discuss the problem minimum number of nodes needed to construct energy efficient network and what is the corresponding placement scheme used in field. © 2014 IEEE. Source

Jagwani D.,Indian National Environmental Engineering Research Institute | Kulkarni A.,DataSol Consultancy | Shukla P.,Laboratory at Ramky Enviro Engineers Ltd. | Ramteke D.S.,Indian National Environmental Engineering Research Institute | Juneja H.D.,RTMNU
Bulletin of Environmental Contamination and Toxicology | Year: 2011

As a consequence of offshore drilling, used Water Based Drilling Muds (WBMs) are typically disposed off, by discharging into the sea; such a disposal does not fully eliminate the environmental hazards. Hence, in this study, 2, 3, 4 and 5 ringed polycyclic aromatic hydrocarbons (PAHs i.e. naphthalene, fluorene, phenanthrene, fluoranthene, chrysene and benzo (a) pyrene) were determined from the WBMs and associated drill cuttings obtained from varying depths(viz. 150, 300 and 600 m) from three offshore wells present in East coast of India. In both WBMs and drill cuttings, concentration of naphthalene was maximum i.e. 81.59 ± 2.73 and 39.87 ± 2.40 mg/kg respectively, while benzo (a) pyrene was minimum i.e. 0.19 ± 0.07 and 0.12 ± 0.03 mg/kg respectively. The WBMs contained significantly (p < 0.05) higher PAH concentration than drill cuttings. The individual PAH concentration significantly (p < 0.01) increased with increasing depth in each well. © 2011 Springer Science+Business Media, LLC. Source

Khedikar R.,RTMNU | Kapur A.,Q A CEO | Chawhan M.D.,RCOEM
Proceedings - International Conference on Electronic Systems, Signal Processing, and Computing Technologies, ICESC 2014 | Year: 2014

Recently the application of wireless sensor network (WSN) is very popular for monitoring the remote or hostile environments. Network lifetime is the critical characteristic in wireless sensor network. In large scale reconnaissance system the lifetime of wireless sensor network (WSNs) system is the time period that all targets can be covered. Target coverage problem is one of the issues to increase the lifetime of wireless sensor network. This problem can be solved by scheduling the sensors activity by keeping minimum number of nodes active at particular time. The sensors from the active sets are monitoring all targets and liable to transmit the data to the base station and the remaining nodes are in sleep mode. In this paper we propose Genetic Algorithm in which we keep minimum number of nodes active by forming set cover by divide all the deployed sensors in to mutually elite subsets of sensors or set cover such that each set of can cover all targets. After finding the set cover they may work by turns means at one time only one set will active and other will sleep mode by designing heuristics that efficiently compute the set covers hence lifetime of WSNs can be prolong by finding more sensor set. The simulation results presented to verify the approach the maximum number of sensor cover can be found by conversion to the Cover Set problem, which has been proved to be NP-complete. © 2014 IEEE. Source

Khedikar R.,RTMNU | Kapur A.,MGI | Chawan M.D.,RCOEM
Lecture Notes in Electrical Engineering | Year: 2014

Recently wireless sensor network (WSN) is very popular for monitoring the remote or hostile environments. One major challenge in WSN is to build energy efficient network with total coverage & connectivity. The WSN consist of a large number of tiny nodes having sensing, computation & communication capability. The deployment of sensor nodes is the first step in establishing a sensor network. The large number of sensor nodes are deployed randomly & must be in the form of cluster, as a location of each particular node cannot be fully guaranteed a priori so that nodes must completely cover the target area. To build energy efficient network with the stochastically placed nodes, it is necessary to activate only vital number of nodes at any particular moment. In this paper we introduce a heuristic that will find out the mutually exclusive set called disjoint complete set of sensor nodes, where the member of each set together will completely cover the target area and work by turns. As the more number of sensor covers can be found the sensorsnetwork lifetime can be prolonged. © 2014 Springer. Source

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