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Documentation of medicinal flora in Pazhavar River Bed, Korkai, Mayiladuthurai Taluk, Tamil Nadu, India

100%

Jayakumar K. , Raja R. , Vinoth M.

tom 19

The indigenous systems of medicines, developed in India for centuries, make use of many medicinal herbs. These systems include Ayurveda, Siddha, Unani and many other indigenous practices. The Nagapattinam district is considered as notable land for rich biological resources and broad spectra of plant existence. The flora of the district is wealthy and rich and vibrant because of the moist deciduous and dry deciduous mode of vegetation. The documentation of the present study provides evidence that medicinal flora play an important role in the human health care system of Mayiladuthurai Taluk, Nagapattinam district of Tami Nadu, India.

Comparative investigation of friction stir welding and fusion welding of 6061 T6 – 5083 O aluminum alloy based on mechanical properties and microstructure

100%

Jannet S. , Mathews P. K. , Raja R.

tom Vol. 62, nr 4

791--795

This paper compares, the mechanical properties of welded joints 6061 T6 and 5083 O aluminium alloys obtained using friction stir welding (FSW) at four rotation speeds namely 450,560,710 and 900 rpm and that by conventional fusion welding. FSW welds were carried out on a milling machine. The performance of FSW and Fusion welded joints were identified using tensile test, hardness test and microstructure. The properties of FSW and fusion welded processes were also compared with each other to understand the advantages and disadvantages of these processes for welding applications for Al alloys. It was seen that the tensile strength obtained with FSW was higher as compared to conventional fusion welding process. The width of the heat affected zone of FSW was narrower than Fusion welded joints. The results showed that FSW improved the mechanical properties of welded joints.

Synthesis and characterization of AA5083 and AA2024 reinforced with SiO2 particles

100%

Raja R. , Jannet S. , Thampy M. A.

nr 2

Stability of impulsive Hopfield neural networks with Markovian switching and time-varying delays

100%

Raja R. , Sakthivel R. , Anthoni S. M. , Kim H.

tom Vol. 21, no 1

127-135

The paper is concerned with stability analysis for a class of impulsive Hopfield neural networks with Markovian jumping parameters and time-varying delays. The jumping parameters considered here are generated from a continuous-time discrete-state homogenous Markov process. By employing a Lyapunov functional approach, new delay-dependent stochastic stability criteria are obtained in terms of linear matrix inequalities (LMIs). The proposed criteria can be easily checked by using some standard numerical packages such as theMatlab LMI Toolbox. A numerical example is provided to show that the proposed results significantly improve the allowable upper bounds of delays over some results existing in the literature.