Karthikeyan S.,Syed Ammal Engineering College |
Prathima A.,Syed Ammal Engineering College |
Elango A.,Alagappa Chettiar College of Engineering And Technology |
Sabariswaran K.,Mk University
Indian Journal of Geo-Marine Sciences | Year: 2016
The role of additives for biodiesel has gained most reliable position in the current scenario as they reasonably formulate base fuel composition contribute to efficiency reliability and long life of an engine. They also can have surprisingly large effects even when used in low (ppm) range. With the use of fuel additives for blending the biodiesel in compression ignition engine, one can expect improved engine performance, diminished exhaust emissions characteristics and also improved fuel properties, which could enhance the combustion characteristics. There are many reports based on the biodiesel blended with nanoparticles additive, however, there is a vacuum in the research pertaining to the use of the most common, low-cost and eco-friendly CeO2 nanoparticles as additive to prepare blended canola biodiesel fuel. Moreover, there are very few literatures available on the usage of CeO2 blended biodiesel. In the present study, an attempt has been made to improve and understand the engine performance of biodiesel blended with CeO2 nanoparticles and to reduce the resultant exhaust emissions. © 2016, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.
Geetha C.,iversity |
Ramakrishnan M.,Mk University
International Journal of Applied Engineering Research | Year: 2015
As the uses of wireless sensor networks in military, civil, health and other areas grows. So the security in these networks is a major concern and has to be concentrated. Since the sensor nodes are resource constrained they are easily captured by other malicious nodes in various form. Out of the various attacks, clone attack and Sybil attacks are two most common attacks. Several algorithms were developed to detect clone and Sybil nodes in wireless sensor network separately. We propose a new hybrid approach which detects both clone and Sybil nodes simultaneously. The proposed system detects clone and Sybil nodes with high detection rate. There are no false positives and false negatives. The processing load is distributed to all nodes evenly except Region Agents (RAs). In Region Agents communication and storage overhead are little high. Even then this approach uses location, id, symmetric key and also the distance between the node and RA as the information to check both the clone and Sybil nodes and detects both attacks at the same time. Since at a time multiple parameters are checked, there is no possibility to misidentify any trust node as malicious node and malicious node as trust node. The simulation results show that the proposed algorithm is efficient in terms of detection rate and provides high security. Keywords: Clone Attack, Detection Rate, Region Agent, Sensor Network, Storage Overhead, Sybil Attack © Research India Publications.
Rajashabala S.,Mk University |
Raman K.,Anna University
International Journal of Nanoscience | Year: 2010
In our earlier works, the effective mass theory (EMT) was critically examined for a hydrogenic donor in a quantum well (QW) and in a quantum dot (QD) after introducing position dependent effective masses (PDEMs). Our results showed that the use of constant effective mass was justified for all well dimensions a*, the effective Bohr radius which is 100 Å in GaAs. Here the validity of EMT in the presence of an electric field is examined. The electric field dependent donor ionization energies in both the systems with finite and infinite barriers for different well dimensions have been calculated. It is shown that the electric field affects donor binding energies appreciably, the variation being larger in the case of finite barrier systems when PDEM is used. The donor polarizability has also been estimated in both the systems and the results are compared with other works in the literature. The use of EMT is justified if constant effective mass is used in general, even though large variation in the ionization energies occur in the finite barrier cases when position dependent mass is included correctly. © 2010 World Scientific Publishing Company.