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Articles by V. Ravi
Total Records ( 3 ) for V. Ravi
  V. Ravi and K. Duraiswamy
  In order to deal with wide range of operating environment and disturbance, Power System Stabilizers (PSS) should be developed with appropriate stabilization signals. Recently, stabilizing control techniques for the Multi-Machine Power System with the help of intelligent methods have been developed. The main aim for the stability analysis of the power system is because of the importance of the power systems in the present world. Moreover, industries do not encourage the controller design if power system stability is not significant. In order to handle the above mentioned problems, intelligent approaches are used. The optimal sequential design for Multi-Machine Power Systems is very vital and many techniques are widely used to deal with control signals in power system. Most widely used optimization technique is Genetic Algorithm (GA). But GA takes more time in optimization and lack in accuracy. To overcome the above mentioned issues, this study uses Non-dominated Ranked Genetic Algorithm (NRGA) for optimization. Simulation results suggest that the proposed stabilization approach is better when compared to the conventional techniques.
  T. Parthipan , V. Ravi , E. Subramanian and T. Ramesh
  Rice is the most important cereal crop which plays major role in Indian food economy as well as dietary needs of the world. A major hindrance in the successful cultivation of rice is heavy infestation of weeds. Hence, the field investigations were carried out at Tamil Nadu Rice Research Institute, Aduthurai during wet seasons of 2011-12 and 2012-13 to study the effect of integrated weed control on growth and yield of transplanted rice and its residual effect on succeeding black gram. Experiments were tested in randomized block design replicated thrice. Treatments consisted of application of herbicides viz., clomazone 500 g ha-1, clomazone + 2, 4-DEE 500 g ha-1, butachlor 1250 g ha-1, pretilachlor 500 g ha-1 and bispyribac sodium 25 g ha-1 followed by (fb) Hand Weeding (HW) on 45 Days After Transplanting (DAT). Pre plant incorporation of glyphosate 2.5 L ha-1 fb pre emergence application of bensulfuron methyl plus pretilachlor 660 g ha-1 was also tested with two hand weedings and unweeded control. The highest grain yield (5831 and 8783 kg ha-1) were recorded under two hand weedings during both years as a result of reduced weed dry weight and increased growth attributes. This was on par with application of bispyribac sodium 25 g ha-1 fb one HW (5613 and 8653 kg ha-1). The results indicated that herbicides applied in rice did not showed their residual effects on succeeding black gram. Even though the results of two hand weedings were better, it can not be recommended at larger scale as it is time consuming and laborious. Hence, post emergence application of bispyribac sodium 25 g ha-1 fb one HW on 45 DAT can be recommended for better weed control and productivity in transplanted rice.
  Shalaka C. Navale , V. Ravi and I.S. Mulla
  Pure and ruthenium (Ru) doped nano-crystalline zinc oxide (ZnO) powders were synthesized by using well-known citrate gel route. Citric acid acts as a chelating agent and thus helps in the formation of nanoparticles. The detailed X-ray diffraction (XRD) studies using Hall equation reveal that in the nanoscale dimensions, incorporation of Ru modulates the lattice strain. It is interesting to note that on Ru doping, the compressive strain present in the undoped ZnO changes into tensile strain. We have tested the response of these specimens individually for reducing gases like H2, LPG (liquefied petroleum gas), C2H5OH (ethanol), CO, acetone and oxidizing gases like NOx and Cl2. Undoped ZnO responses perceptibly to LPG while Ru doped sample highly senses ethanol vapors. This might be due to either change in composition on Ru doping or/and difference between basicity of LPG and C2H5OH vapors.
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