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Articles by S. Ravi
Total Records ( 4 ) for S. Ravi
  S. Ravi , S. Ramesh and B. Chandrasekaran
  Field experiments were conducted during Kharif 2000 and 2001 in the wetland research farm of Tamil Nadu Agricultural University, Coimbatore to study the effects of green manuring and fertilizer N application based on LCC grades on the yield enhancement, nutrient uptake and economics of hybrid rice. Treatments consisted of two hybrids in the main plot and seven levels of N management practices during Kharif 2000 and eight sub-plot treatments during Kharif 2001. Among the hybrids, PA6201 registered significantly higher grain yield of 7363 and 7555 kg ha-1 during Kharif 2000 and 2001 respectively with a yield advantage of 9.5% over CoRH2 in both the seasons. The N, P and K uptake at different growth stages revealed that rice hybrid PA 6201 was superior than CoRH2 in both the seasons. Application of green manure @ 6.25 t ha-1 in combination with N application based on LCC critical value 5 recorded significantly higher grain yield compared to other treatments in both the seasons. The N, P and K uptake in green manure @ 6.25 t ha-1 combined with LCC critical value 5 based N application (N4) was significant at all the stages, however it was comparable with 200 kg N ha-1 alone (N1) except at tillering stage. In both the years PA6201 hybrid recorded high net returns of 15.05 and 14.60% over CoRH2. Application of green manure @ 6.25 t ha-1 combined with LCC critical value 5 based N application (N4) recorded higher net returns and B:C ratio during both the years and it was followed by application of 200 kg N ha-1 alone (N1). Therefore, the rice hybrid PA6201 with application of green manure 6.25 t ha-1 combined with LCC critical value 5 based N applications significantly increased grain yield, nutrient uptake and in turn resulted in higher net return and B:C ratio.
  M. Moorthy , S. Saravanan , C. Mehala , S. Ravi , M. Ravikumar , K. Viswanathan and S.C. Edwin
  Two hundred and eighty commercial layer chicks belonging to single hatch were purchased from local hatchery, wing banded, weighed and randomly allotted into seven treatment groups with four replicates of ten chicks each. The chicks were reared in cages in a gable roofed, open sided house. All the chicks were provided with uniform floor, feeder and waterer space and were reared under standard management conditions throughout the experimental period. The experimental diet was formulated according to the standards prescribed in Bureau of Indian Standards (B.I.S., 1992). The treatment groups were T1-Control; T2-0.1% aloe vera; T3-0.1% turmeric; T4-0.1% probiotic; T5-0.1% aloe vera + 0.1% turmeric; T6-0.1% aloe vera + 0.1% probiotic and T7-0.1% turmeric + 0.1% probiotic powder. There was no significant difference in feed consumption. Hen housed egg production, hen day egg production and return over feed cost differ significantly after 40 weeks of age during the experimental period. The overall mean per cent broken eggs differ significantly (p<0.05) among treatment groups but no significant difference was observed in overall mean feed conversion ratio per dozen eggs during the experimental period.
  M. Moorthy , S. Ravi , M. Ravikuma , K. Viswanathan and S.C. Edwin
  Two hundred and ten commercial, straight run day-old Vencobb broiler chicks belonging to single hatch were purchased from local hatchery, wing banded, weighed and randomly allotted into seven treatment groups with three replicates of ten chicks each. The chicks were reared in broiler cages in a gable roofed, open sided house. All the chicks were provided with uniform floor, feeder and waterer space and were reared under standard management conditions throughout the experimental period of six weeks. The treatments were T1-Control; T2-0.2% Ginger powder; T3-0.2% Pepper powder; T4-0.2% Curry leaf powder; T5-0.2% Ginger + 0.2% pepper; T6-0.2% Ginger + 0.2% Curry leaf powder and T7-0.2% Pepper + 0.2% Curry leaf powder. The mean body weight (g/bird) of broilers at 6 weeks of age fed with different inclusion levels of dried ginger, pepper and curry leaf powder differ significantly (p<0.05) among treatment groups at six weeks of age. The feed conversion ratio was significantly (p<0.01) superior in ginger-curry leaf (T6) and pepper-curry leaf powder (T7) fed groups compared to control. But the feed consumption did not differ significantly among treatment groups because of isocaloric and isonitrogenous diet. The mean return over feed cost of T2 and T5 was significantly (p<0.01) higher when compared to other treatment groups at sixth week of age. The carcass characteristics viz. pre-slaughter, New York dressed, eviscerated weights, ready-to-cook percentage, abdominal fat percentage and giblets weight did not differ significantly between the treatment groups fed different levels of dried ginger, pepper and curry leaf powder from 1-6 weeks of age.
  P. Manavalan and S. Ravi
  A study was carried out on Pulsed Gas Metal Arc Welding (P-GMAW) of AISI 904 L super austenitic stainless steel with a thickness of 5 mm and a filler wire of diameter of 1.2 mm. The joints were made with different process parameters, peak current (Ip), pulse time (tp), pulse frequency (f), back ground current (Ib) and welding Speed (S) were considered as the input responses. Central composite rotatable design was used to carry out the experimental design and predict the effects of input and output responses. The processed joints were evaluated to obtain good welded joints in terms of good bead profile and mechanical properties such as bead width, tensile strength, percentage of elongation, impact strength and micro hardness of the welds which were considered as the output responses. Super Austenitic Stainless Steel (SASS) normally contains high amount of Mo, Cr, Ni, N and Mn. In order to solve a multi response optimization problem, the traditional Taguchi approach is not sufficient to get more appropriate results. To get appropriate and accurate results, a multi criteria decision making approach, namely, Techniques for Order Preference by Similarity to Ideal Solution (TOPSIS) technique was preferred and the same was applied in the present study. The Analysis of Variance (ANOVA) was carried out to investigate the significant process parameter for the pulsed gas metal arc welding process. Confirmation experiment was also conducted to validate the optimized parameters obtained from TOPSIS.
 
 
 
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