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Search Results: 1 - 10 of 223882 matches for " R. Palani "
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State Space Modeling and Implementation of a New Transformer Based Multilevel Inverter Topology with Reduced Switch Count  [PDF]
R. Gandhi Raj, S. Palani, H. Habeebullah Sait
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.74038
Abstract: This paper presents a new transformer based multilevel inverter, with a novel pulse width modulation scheme to achieve seven-level inverter output voltage. The proposed inverter switching pattern consists of three fundamental frequency sinusoidal reference signals with an offset value, and one high frequency triangular carrier signal. This switching scheme has been implemented using an 8-bit Xilinx SPARTAN-3E field programmable gate array based controller. In addition, the state space model of the proposed inverter is developed. The significant features of the proposed topology are: reduction of the power switch count and the gate drive power supply unit, the provision of a galvanic isolation between load and sources by a centre tap transformer. An exhaustive comparison has been made of the existing multilevel inverter topologies and the proposed topology. The performances of the proposed topology with resistive, resistive-inductive loads are simulated in a MATLAB environment and validated experimentally on a laboratory prototype.
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: The aim of the present study was to evaluate the effect of quick march on physical fitness parameter flexibility among high school boys. Methods: Thirty men students age between 12 and 14 were randomly selected and they were divided into two equal groups (n = 15) namely quick march training group and control group. The quick march group were underwent their respective training programme for five days per week for six weeks in which the CG did not participate any special training programme apart from their regular physical education activities as per their curriculum. Flexibility was chosen as a criterion variable it was measured by Sit and Reach test. All the subjects of two groups were tested on selected dependent variables at prior to and immediately after the training programme. Statistical Analysis: The analysis of (ANCOVA) was used to analyze the significant difference, if any between the groups if any. Result: The result showed that However, the improvement on flexibility was greater in quick march training group than in control group.
Elastic and mechanical properties of glass specimen by ultrasonic method
A. N. Kannappan,S. Thirumaran,R. Palani
Journal of Engineering and Applied Sciences , 2009,
Abstract: Ultrasonic velocity and density measurements in Na2CO3 – ZnO – B2O3 and Na2CO3 – PbO – B2O3 composition glasses have been made at a temperature of 303K. These measured values are used to evaluate elastic modulii such as longitudinal, Young’s, bulk and shear, Poisson’s ratio, acoustic impedance, micro hardness, Debye temperature and thermal expansion coefficient. The results of these parameters have been discussed in terms of the structural and physical properties of the prepared glasses.
Molecular interaction studies of glycylglycine in aqueous sodium halide solutions at 303, 308 and 313k
R. Palani,S. Balakrishnan,K. A. Sudhamani
Journal of Engineering and Applied Sciences , 2010,
Abstract: Ultrasonic velocity, density and viscosity have been measured for glycylglycine in aqueous sodium halide (NaF, NaCl, NaBr) mixture (0.5m) at 303, 308 and 313K. Using the experimental values, the adiabatic compressibility, hydration number, apparent molal compressibility, apparent molal volume, limiting apparent molal compressibility, limiting apparent molal volume and their constants (SK, SV), transfer volumes at infinite dilution and viscosity B-coefficient of Jones-Dole equation were calculated. These parameters have been interpreted the molecular interactions in terms of solute-co-solute and solute-solvent interaction present in the given solutions.
Drug rash with eosinophilia and systemic symptoms syndrome due to quinine
Bankar R,Kohnke A,Palani S
Journal of Postgraduate Medicine , 2007,
Volumetric and Thermodynamic Studies of Molecular Interactions in Ternary Liquid Mixtures at 303, 308 and 313K
AN. Kannappan1,S. Thirumaran,R. Palani
Journal of Physical Science , 2009,
Abstract: Ultrasonic velocity, density and viscosity were measured for mixtures of 1-alkanols, namely, 1-propanol, 1-butanol, 1-pe ntanol and 1-hexanol, with N, N-dimethylformamide (DMF) in cyclohexanone at 303, 308 and 313K. The experimental data were used to calculate the excess free volume (Vf E), excess internal pressure ( π iE),and Gibb’s free energy (ΔG*), which were discussed in the light of molecular interaction existing in the mixtures. It was observed that the addition of DMF to mixtures caused the dissociation of the hydrogen-bonded structure of 1-alkanols. Furthermore, the DMFalkanolinteractions were weaker than the alkanol-ketone interactions in the mixtures.
Ultrasonic Studies of Amino Acids in Aqueous Sucrose Solution at Different Temperatures
R. Palani,S. Balakrishnan,G. Arumugam
Journal of Physical Science , 2011,
Abstract: The density (ρ), viscosity ( ) and ultrasonic velocity (U) were measured for L-histidine, L-arginine and L-lysine in aqueous sucrose (0.5 M) solution at 298, 303 and 308 K. Using the experimental values, the adiabatic compressibility (β), hydration number (nH), apparent molal compressibility ( K), apparent molal volume ( V), limitingapparent molal compressibility ( K0 ), limiting apparent molal volume ( V0 ), theassociated constants (SK, SV) and the viscosity B coefficient of the Jones-Dole equation were calculated. These parameters were used to study the ion-solvent interaction present in each solution.
Purification of an Intracellular Fibrinolytic Protease from Ganoderma Lucidum Vk12 and its Susceptibility to Different Enzyme Inhibitors
S Kumaran, P Palani, R Nishanthi, S Srimathi, V Kaviyarasan
Tropical Journal of Pharmaceutical Research , 2011,
Abstract: Purpose: To study the effect of different inhibitors on the fibrinolytic activity of the enzyme produced by Ganoderma lucidum. Method: The intracellular fibrinolytic protease produced by Ganoderma lucidum VK12 was isolated from the mycelia grown in MCDBF broth and was purified to homogeneity using ammonium sulfate fractionation, ion exchange chromatography and sephadex G-150 column chromatography techniques. The purity of the enzyme was verified on SDS-PAGE after silver nitrate staining. The inhibitory effect of different metal ions and commercial protease inhibitors on enzyme activity was studied. The inhibitortreated enzyme was assayed with its substrate and the residual activity of the enzyme recorded. Result: The fibrinolytic enzyme isolated from Ganoderma lucidum was purified to near homogeneity and it appeared as a single protein band on SDS-PAGE. Metal ions such as Ca2+ and Mg2+ inhibited the activity of the enzyme while Zn2+ ions enhanced the activity. Complete inactivation occurred when the enzyme was incubated with protease inhibitors such as EDTA, 1, 10-phenanthroline, phosphoamidon while the enzyme was insensitive to protease inhibitors such as leupeptin, PMSF, TPCK and APMSF. Conclusion: Copper sulfate completely inhibited the enzyme activity. The sensitivity of this enzyme to EDTA suggests that it might be a metalloprotease.
Ultrasonic Studies of Some Biomolecules in Aqueous Guanidine Hydrochloride Solutions at 298.15 K
R. Palani,A. Geetha,S. V. S. L. Poornima
Journal of Chemistry , 2011, DOI: 10.1155/2011/856284
Analysis of the Tool Condition Monitoring System Using Fuzzy Logic and Signal Processing  [PDF]
Chidambaram Ramesh Kannan, Palani Padmanabhan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.79232
Abstract: In the present investigation, an attempt was made to facilitate tool condition monitoring system on cryogenic treated using fuzzy logic and signal processing. Cryogenic treatment is carried out at -196°C for 48 hours followed on tempering at 200°C for 2 hours. The AISI4340 steel is machined with cryogenically treated inserts. Speed, feed and depth of cut are selected as input parameters. The results of the proposed method are encouraged in minimizing tool vibration, flank and crater wear. Good correlation is shown between the neural fuzzy and experimental data. As a result, it is found that cryogenically treated inserts have superior tool wear and vibration resistance, and confirmed by conducting further confirmation tests.
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