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Response surface methodology and artificial neural network for modelling and optimization of distillery spent wash treatment using Phormidium valderianum BDU 140441

100%

Ravikumar R. , Renuka K. , Sindhu V. , Malarmathi K. B.

Polish Journal of Environmental Studies

2013

tom 22

nr 4

The aim of this work was to evaluate the capability of Phormidium valderianum BDU 140441 on biodegradation and decolorization of distillery spent wash. The effect of initial pH (6-10), temperature (24- 32ºC), and light intensity (20-54 W/m2) was studied using single factorial design and achieved a maximum decolorization of 74.5% with COD reduction of 83.48%. A 23 full factorial experimental central composite design (CCD) of response surface methodology (RSM) was used to investigate the interaction effect between these variables and the optimal values. The predicted results showed that a maximum decolorization of 85.5% and COD reduction of 87.29% was achieved under the optimum conditions of 8 pH, 30ºC, and light intensity of 36 W/m2. It was observed that model predictions were in good agreement with experimental values (R2 = 0.9830, Adj-R2 = 0.9677), which indicated the suitability of the model and the success of the optimization tool. A non-linear artificial neural network (ANN) model was developed to predict the biological decolorization of the spent wash. The results indicated that ANN revealed reasonable performance (R2=0.9999, y=0.9781x-0.5679).

Workability behavior of hybrid copper matrix composites synthesized by powder metallurgy technique

75%

Ilayaraja K. , Ranjith Kumar P. , Anandakrishnan V. , Sathish N. , Ravichandran V. , Ravikumar R.

Mechanics and Mechanical Engineering

2017

tom Vol. 21, nr 2

207--216

Copper based hybrid composite materials with 5wt.% of titanium dioxide and 0wt.%, 2wt.% and 4wt.% of graphite were produced using powder metallurgy technique. The presence and distribution of titanium dioxide and graphite reinforcements were examined in the copper matrix using scanning electron microscopic and energy dispersive spectroscopic analysis. To investigate the workability behavior of the sintered composite preforms, cold upset tests were conducted and various stresses and forming parameters were determined and using that various stress ratio parameters such as the true axial stress versus the true effective stress, the true hoop stress versus the true effective stress, the true hydrostatic stress versus the true effective stress and the true hoop stress versus the true hydrostatic stress were calculated and correlated with the true axial strain. From the studies, the workability of the composite is found to increase with increasing graphite content due to increase in lubricating affect by graphite addition.