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M. Sivashanmugam ¹, T. Kumar ²

Affiliations
1 Department of Mechanical & Production Engineering, Sathyabama University, Chennai, IN
2 Department School of Mechanical Engineering, SRM University, SRM Nagar, Chennai, IN

Abstract

Friction stir welding is a solid state joining process and is widely being considered for aluminium alloys. The main advantage of FSW is the material that is being welded undergoes only localized changes. The welding parameter and tool pin profile play a major role in deciding the weld quality. In this work an effort has been made to analyze microstructure of aluminium AA 7075-T6 alloy. Three different tool profiles (Taper Threaded and square) have been used to construct the joints in particular rotational speed. Tensile, Impact, micro hardness of mechanical properties of the joints have been evaluated and the formation of FSP zone has been analyzed microscopically. From the investigation it is found that the threaded cylindrical profile produces highly defined Strength in welds.

Keywords

AA7075-T6 Aluminium Alloy, Friction Stir Welding, Tool Pin Profile, FSP Zone, Tensile, Impact Evaluation.

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B. Abirami ¹, T. Kumar ², R. Saravanamuthu ³

Affiliations
1 Department of Microbiology, Idhaya College for women, Kumbakonam, IN
2 PG and Research Department of Botany and Microbiology, A.V.V.M Sri Pushpam College (Autonomous), Poondi-613503, IN
3 Department of Botany, A.V.C College (Autonomous), Mayiladuthurai, IN

Abstract

The growth of fungal organisms colonizing the India currency was studied. The samples were collected from various habitats of India culture and the subjected to microscopic and macroscopic study. The fungi were both qualitatively and quantitatively more during October, December, January and August. Totally 57 species were recorded. Aspergillus species were the predominant among other fungal species over the Indian currency collected from ten important public places. These fungi showed celluloytic activity and hence they could easily colonize the Indian paper currencies and spoil them. Aspergillosis is considered as the second most common fungal infection caused by Aspergillus fumigatus. The currency notes could possibly responsible for the transmission of the potential pathogenic microorganisms. The results indicated that improper handling of currency is also one of the reasons for the transmission of different microorganisms and for causing various diseases.

Keywords

Indian Currency, Fungal Flora, Aspergillosis.

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T. Kumar ¹, V. Kumar ¹

Affiliations
1 Crop Research Station (N.D. University of Agriculture and Technology), Ghaghraghat, Baharaich (U.P.), IN

Abstract

A field experiment was conducted to study the effect of rates and methods of zinc application in rice under flood prone condition. There was significant increase in the yield and yield attributes of rice crop upto 45 kg ZnSO₄/ha. The content and uptake of zinc was also increased significantly with increasing levels of zinc sulphate. Soil applied Zn was superior as compared to its foliar application. Soil application of 45 kg ZnSO₄/ha was found to be the best which recorded the highest net monetary return Rs. 8111 ha 1 with BCR 1.63.

Keywords

Rice, ZnSO₄.

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