Time filter

Source Type

A series of ruthenium(III) complexes [RuX(EPh3)2L] (where X = Cl or Br; E = P or As; L = deprotonated dibasic tridentate ligand) were prepared by the reaction of [RuX3(EPh3)3] with Schiff bases (H2L1-H2L4). The ligands were prepared by the condensation of N-4 phenyl/methyl semicarbazide with o-vanillin/o-hydroxy acetophenone. The complexes were characterized by elemental, physico-chemical, and electrochemical methods. Catalytic studies of these complexes for the oxidation of alcohols and aryl-aryl coupling were carried out. Antimicrobial experiments were also carried out. © 2010 Taylor & Francis.

Murugananth G.,Pollachi Institute of Engineering and Technology | Vijayan S.,Surya Engineering College
Life Science Journal | Year: 2013

Orthopedic surgical simulators are used by the trainee surgeons to drill the bones and place the screws. These simulators use PMDC motors for bone drilling. In this paper a closed loop chopper controlled drive is proposed and evaluated. The chopper controlled drive has an inner current control loop and an outer speed control loop. The outer control loop employs a conventional PI controller for the speed control of the PMDC motor. The anti-windup PI controller based system is proposed in order to enhance the performance of the system. The system is simulated using Matlab / Simulink and the performances of various anti-windup schemes are analysed. The properties of these controllers were measured and tabulated. The simulation results inferred that the proposed closed loop system with tracking anti-windup schemes can be used for the effective control of the PMDC motor in orthopedic surgeries.

Subramaniam V.,Surya Engineering College
Electric Power Components and Systems | Year: 2015

This article proposes an extended reference signal generation scheme for the integration of a three-phase four-wire unified power quality conditioner in a grid-connected photovoltaic system. The photovoltaic-unified power quality conditioner provides compensation against voltage harmonics, current harmonics, and voltage interruption for the whole day. It also transmits the power generated in the photovoltaic system to the load. The proposed topology utilizes the green energy source with an energy storage unit to address the DC-link voltage requirement of the shunt and series active power filters of the unified power quality conditioner. The high-selectivity filter is used in the shunt inverter control scheme for reference current generations. The series inverter in the unified power quality conditioner is used for supplying a part of reactive power required by the load and for compensation of sag/swell, supply voltage unbalance, and distortions. This is achieved by controlling the phase angle and magnitude of series-injected voltage called the power angle control method. The simulation and experimental studies are carried out to validate the effectiveness of the proposed photovoltaic-based three-phase four-wire unified power quality conditioner. © 2015 Taylor & Francis Group, LLC.

Gurusamy K.,Surya Engineering College | Chakrapani V.,Erode Builder Educational Trusts Group of Institutions
Journal of Computer Science | Year: 2012

Recent advances in data collection, data dissemination and related technologies have inaugurated a new era of research where existing data mining algorithms should be reconsidered from the point of view of securing sensitive data. People have become increasingly unwilling to share their data. This frequently results in individuals either refusing to share their data or providing incorrect data. In turn, such problems in data collection can affect the success of data mining, which relies on sufficient amounts of accurate data in order to produce meaningful results. Based on the analysis of shortcomings of earlier technologies this study proposes a new method for securing numerical and categorical data. In this method the categorical data is converted into Binary form and perturbation based noise is introduced as a security method based on the security level anticipated. Several types of noise addition methods were employed and generalized results were evaluated in terms of misclassification error and privacy level. An average of misclassification error was below 50% for 75-90% security level, which is better than earlier methods which didn't handle categorical data. The results obtained prove that the proposed method outperforms some of the currently existing methods thereby ensuring the possibility of securing sensitive data irrespective of its type being numerical or categorical. © 2012 Science Publications.

Vijayan S.,Surya Engineering College
JVC/Journal of Vibration and Control | Year: 2015

In this article the fuzzy logic based closed loop chopper controlled permanent magnet DC motor drive is proposed for orthopedic surgical simulators. The proposed drive consists of an inner current control loop and an outer speed control loop. The fuzzy technique is used in the speed loop and the system is simulated using Matlab/Simulink. The steady state and transient state responses of the proposed fuzzy system are compared with conventional PI controlled system. The comparative analysis infers that the fuzzy system provides better performance. © The Author(s) 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.

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