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Search Results: 1 - 10 of 325533 matches for " S. Rajalakshmi "
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Performance Analysis of Receivers in WDM for Extended Reach Passive Optical Networks
S. Rajalakshmi
International Journal of Computer Science Issues , 2012,
Abstract: In this paper we have investigated and analyzed the performance of receivers for different classes of WDM PON system for next generation Passive Optical Networks. The performance is analyzed using Manchester coding for different receivers using various data rates and various fibre distances at the optical network unit in a 32 user WDM PON and DWDM PON. The experimental results are analyzed using the parameters BER, Qfactor and Eye Pattern. The simulation results revealed that the performance gain of around 2.5 Gbps in terms of data carrying capacity per user over a distance of could be achieved if APD receivers are used in the receiver side downstream direction.
Functionalized Exfoliated Graphene Oxide as Supercapacitor Electrodes  [PDF]
Prasanna Karthika, Natarajan Rajalakshmi, Kaveripatnam S. Dhathathreyan
Soft Nanoscience Letters (SNL) , 2012, DOI: 10.4236/snl.2012.24011
Abstract: Functionalized exfoliated graphene oxide (EGO) for supercapacitor electrodes have been synthesized by simple chemical methods from the exfoliated graphite (EG) as precursor. Structural and morphological characterizations of EGO have been carried out using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), FTIR and Raman spectroscopy. Electrochemical performance of these electrodes has been investigated using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The fabricated supercapacitor gave a specific capacitance of 146 Fg-1 and energy density of 20 Wh·kg-1 for a highly oxidized sample with more functional groups compared to pure, lower level oxidized and reduced samples. The single and multi layered graphene oxide sheets produced by this method have a lower degree of agglomeration. We found that the graphene oxide with functional oxygen groups of quinine type enhances the capacitance compared to other oxygen functional groups.
Rajalakshmi G,Sudha S
International Research Journal of Pharmacy , 2012,
Abstract: The imbalance in antioxidants is thought to play an important role in the pathogenesis of bronchial asthma. The present study was undertaken to evaluate the status of lipid peroxidation and antioxidants as biomarkers in human plasma. The extent of lipid peroxidation as evidenced by the formation of thiobarbituric acid reactive substances (TBARS) and the status of the antioxidants by reduced glutathione (GSH) in the smokers with and without asthma. The mean TBARS levels were higher among smokers with asthma (2.97±1.09) when compared with control smokers (0.75 ±0.81). The mean GSH level were higher in control non-smokers (0.172±0.21) compared to asthma smokers (0.032±0.03) and non smokers (0.061±0.06). Measured parameters confirm that cigarette smoke mediated oxidative stress could represent the primary causative factor in the pathogenesis of asthma.
Solving fully fuzzy Linear Programming Problem using Breaking Points
T. Beaula,S. Rajalakshmi
International Journal of Applied Operational Research , 2012,
Abstract: In this paper we have investigated a fuzzy linear programming problem with fuzzy quantities which are LR triangular fuzzy numbers. The given linear programming problem is rearranged according to the satisfactory level of constraints using breaking point method. By considering the constraints, the arranged problem has been investigated for all optimal solutions connected with satisfactory level of quantities on all intervals that constituted from breaking points of the constraints. Optimal solution could be obtained on the constructed [ p-1 , p] intervals for p=1,2… Here the fuzzy primal simplex algorithm is designed based on revised TSAO’s ranking method. Keywords: Triangular Fuzzy Number, Ranking Fuzzy Number, Revised Tsao’s Method ,Fuzzy Linear Programming Problem, Breaking Point, Fuzzy Primal Simplex Algorithm.
Corrosion Inhibition Effect of Dicycloimine Hydrochloride (DCI) on Mild Steel in 1M HCl
R. Rajalakshmi,S. Subhashini
Journal of Chemistry , 2010, DOI: 10.1155/2010/968340
Staminate Flower of Cocos Nucifera as Green Inhibitor for Mild Steel in HCl Medium
R. Rajalakshmi,A. S. Safina
Journal of Chemistry , 2012, DOI: 10.1155/2012/138463
Abstract: Corrosion control methods, especially the use of inhibitors, have gained monumental importance in the present scenario of expunging corrosion and the quest for eco-friendly reasons continues. To arrive at an inexpensive non-toxic, eco-friendly inhibitor formulations the present study on the use of Staminate Flower extract of Cocos Nucifera has been carried out by the classical weight loss measurements and electrochemical polarization measurements. The acid extract could bring out a maximum of 97.3% inhibition of mild steel corrosion in 1M HCl. Thermodynamic parameters of the corrosion process were calculated from temperature study. The adsorptive behaviour of Staminate Flower extract in acid solution may be approximated both by Langmuir and Temkin type isotherms. The results obtained by Tafel, Linear polarization resistance, and impedance spectroscopy have been correlated with the classical weight loss measurements. Values of Tafel constant ba and bc confirmed that the Staminate Flower extract acts like mixed type inhibitor. Examination of the surface of the metal in the presence of the inhibitor confirmed the deposition of inhibitor on the metal surface. The Staminate Flower extract in HCl medium efficiently inhibits the corrosion and proved to be zero cost inhibitor, eco-friendly, non-toxic, and highly economical.
Precision studies of Casimir force and short-range gravity employing prototypes of interferometric gravitational wave detectors
G. Rajalakshmi,C. S. Unnikrishnan
Physics , 2010, DOI: 10.1088/0264-9381/27/21/215007
Abstract: We discuss experimental schemes to measure the Casimir force and short range forces from hypothetical modified gravity with unprecedented sensitivity using highly sensitive prototype gravitational wave detectors as displacement sensors. The finite temperature effects of the Casimir force would be detectable with a sensitivity of better than 1% for separation exceeding 30 microns. Constraints on short range modifications to gravity can be improved in the distance range of 10-100 microns.
Identity Based Encryption Using mRSA in Electronic Transactions
S. Rajalakshmi,S.K. Srivatsa
Information Technology Journal , 2007,
Abstract: This research studies the latest research concept in Computer Security namely Identity Based Cryptography. To start with, the paper gives an introduction to the concept called Identity Based Encryption with Mediated RSA and then applies this concept to do secure transactions through Internet. The research also highlights on the future work that can be carried over in this area.
Sufficient conditions for close-to-convexity of an analytic function in the unit disc
K. S. Padmanabhan,Rajalakshmi Rajagopal,C. Selvaraj
Tamkang Journal of Mathematics , 2003, DOI: 10.5556/j.tkjm.34.2003.17-20
Abstract: Recently C. Ramesha and others have derived a sufficient condition for functions analytic in the unit disc to be starlike. Subsequently M. Nunokowa and others have improved the earlier results of C. Ramesha and others. In this paper we generalise the results of C. Ramesha and others in a different direction and obtain sufficient conditions for $f(z)$ to be close-to-convex in the unit disc $E$.
International Journal of Engineering Science and Technology , 2012,
Abstract: We have designed and analyze the effects using Manchester format for the downstream signal on the performance of upstream transmission using a RSOA based WDM PON system. WDM PON is a current technology for next generation passive optical networks. The simulation setup is made using different sources and receivers for WDM PON. The performance is done using Manchester modulation technique for 100kmusing 2.5Gbps data rate upstream transmission. The design network is analyzed using BER, Q-factor and Eye Pattern. The results prove the significance that these systems can be used for high speed broadband services to subscribers. The results have also confirmed that when down stream signal is re-modulated for upstream transmission; the power budget and scalability could be achieved.
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