ANAS Volume 12, Number 9: September, 2018
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Multiresponse optimization of turning process parameters using TOPSIS and finite element analysis simulation using DEFORM 2D
Mohan Santhana Rajendiran and Dhanashekar Manickam
Abstract: Background: Manufacturing industries are widely dependent on the machining process to perform a specific job and one such important process is turning. Many researchers have divulged the importance of turning process under various forms such as tool selection, tool wear, tool life, minimum quantity lubrication, and machining parameters to curtail tool wear and dwindle surface roughness. Objective: This article discusses the experimental inquest of dry turning of AISI 1045 steel with tungsten carbide inserts (uncoated). TOPSIS method, best multiple attribute decision making method is employed to inquest the output quality factors namely chip temperature, tool-chip interface temperature, wear rate, wear depth and resultant forces. Results: The high values of cutting speed can be used only when the feed rate and cutting depth is minimum in order to obtain better surface texture. When the contact area of the tool cutting increases, the surface roughness of the machined surface increases due to the frictional heat generated, cutting force and temperature determines the surface texture. Conclusion: The Ci values were used to determine the contribution of machining parameters: feed rate was 44% and cutting speed was 31%, which are the more influencing parameters than the depth of cut. DEFORM-2D software for tool wear analysis is performed for simulating the turning process under optimum conditions.
[ FULL TEXT PDF 1-5 ] DOI: 10.22587/anas.2018.12.9.1
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Climate Change Impact and Mitigation In Marine Biodiversity Conservation
S. Naveen Nivas and Dr. I. Sundar
Abstract:
Marine life faces challenges from warming waters and ocean acidification. Warming waters alter the latitude and depth at which certain species are able to survive, so many species are moving deeper or father north in the Atlantic to find cold water. Overall, marine species are responding to warmer temperatures by moving northward or deeper when possible in search of cooler waters. This paper deals with impact of climate change and marine biodiversity. It outlines the climate change impact on marine microscopic organisms, marine plants, corals reefs, marine fish, marine mammals, marine reptiles and seabed dwellers. This paper makes a special note on climate change mitigation option in conservation of marine biodiversity. This paper concludes with some interesting findings along with policy measures.
[ FULL TEXT PDF 6-10 ] DOI: 10.22587/anas.2018.12.9.2
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Optimal conditions, kinetic model and Packed Bed Reactor system for biodegradation of Linear Alkylbenzene Sulfonate by AOS-15 microorganism
Witawat Jangiam, Sarayut Petra
Abstract: BACKGROUNG: Linear alkylbenzene sulfonate (LAS), an anionic surfactant, is the most widely used ingredient in synthetic detergents, and is thus released to the environment in large quantities. Effective methods of treatment which can degrade LAS are need of the hour. OBJECTIVE: The aim of the present study is to develop a bioreactor for complete degradation of LAS using immobilized cells of AOS-15 microorganism isolated from the wastewater treatment plant of Lion Corporation Limited (Thailand) and alginate-entrapped cells of AOS-15 were used for degradation of LAS in a Packed Bed Reactor (PBR). RESULT: The batch shake flask study showed the suitable condition of AOS-15 free cell to biodegrade 3 g/L LAS is 2.1 g cell mass. Moreover, we studied LAS initial concentration and pH on the degradation of LAS of free and calcium alginate immobilized cells. The results showed that LAS degradation was significantly improved using immobilized cells compared to that of free cells, where 2.1 g of immobilized cell at pH7 totally removed 100 ml of 3 g/L LAS within 48 hours. The efficiency of LAS degradation was further monitored in batches and continuous bioreactor experiments. The kinetics of biodegradation was optimized at the best conditions of free cell experiment. Simultaneously, kinetics equation of LAS biodegradation in batch at LAS concentration of 1.5-5 g/L is: Further, on Packed Bed Reactor (PBR) system, the immobilized microorganism was placed in the PBR column and the synthetic medium with LAS was pumped into it at 0.06 ml/minute. LAS could be degraded by AOS-15 microorganisms up to 80–96% in 80 hours of continuous study. CONCLUSION: The LAS biodegradation by AOS-15 microorganisms in a continuous flow system of PBR showed the efficiency of biodegradation. Our experiment showed that the PBR system had a high efficiency of LAS degradation, i.e., in 0–84 h, the biodegradation rate ranged from 80–96%.
[ FULL TEXT PDF 11-16 ] DOI: 10.22587/anas.2018.12.9.3
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14T Full Adder in 125nm CMOS technology for FFT applications using piecewise constant
interpolation f(x) = 2.0
G.Naveen Balaji, P.Malini, T.Poovika, P.Shanmugavadivu, J.Jayageetha
Abstract:
Background: Full adders play an important role in applications such as digital signal processors (DSP) architectures and
microprocessors, according to the concept of adding two numbers, which tends to be its main task, it also participates in many
other useful operations such as subtraction, multiplication, division, address calculation, etc. Objective: Modeling and
simulation of a 14T full adder in static and dynamic style using 125nm technology. Results: The window function for each
(static, dynamic, 14T) design styles is carried out for the interpolation 2 with the N value 10 is performed. The power analysis
performed is found to have a max power of 3.8 and min power of 1.7. The FFT transformation of an image is performed and
the corresponding noise factor and the strength is calculated. Conclusion: By the use of Fast Fourier Transformation (FFT), the
transformation used in each window allows to evaluate the power at various interpolation rate. Thus, the scope lies in a
reduced power consumption.
[ FULL TEXT PDF 17-26 ] DOI: 10.22587/anas.2018.12.9.4
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