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J. Suneetha ¹, J. Koteswara Rao ¹, P. Prabhakara Rao ¹, T. V. V. Seetharami Reddi ¹

Affiliations
1 Department of Botany, Andhra University, Visakhapatnam 530003, IN

Abstract

The present paper deals with 25 plant species belonging to 24 genera and 18 families used to cure jaundice by the tribal of East Godavari district. Euphorbiaceae is the dominant family followed by Acanthaceae and Solanaceae. Of the 25 practices 9 were found to be new.

Keywords

Ethnomedicine, Jaundice, East Godavari, Andhra Pradesh

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G. G. Vaz ¹, N. R. Biswas ¹, P. Prabhakara Rao ¹

Affiliations
1 East Coast Operations-II, Marine Wing, Geological Survey of India 41, Kirlampudi Layout, Visakhapatnam - 530 017, IN

Abstract

A well preservedlamellibranch fossil cast belonging to Genus:Crassatella of Cretaceous - Miocene age and fossil bearing phosphatic rock pieces were recovered by grab sampling from the continental shelf edge, off Madras. Phosphatic rock pieces contain Globigerina linaperta of Upper Paleocene - Lower Eocene age. Cretaceous - Eocene sedimentary sequence of Cauvery basin is occurring on the seabed in continental shelfedge, off Madras.

Keywords

Palaeontology, Cretaceous-Eocene, Continental Shelf, East Coast.

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G. Dilli Babu ¹, P. B. Dhanish ², P. Prabhakara Rao ¹

Affiliations
1 Dept. of Mech. Engg., V R Siddhartha Engg. College, Vijayawada, IN
2 Dept. of Mech. Engg., National Institute of Technology, Calicut, IN

Abstract

In this work, a machine vision system has been utilized to determine the surface roughness of the milled surfaces. For checking the effectiveness of the machine vision based results, a wide range of surface roughness were generated on CNC milling centre using DoE technique. Stylus-based parameters R_a and R_sm were acquired and compared with vision-based parameters (cofvar, G_a, R2, contrast etc). Also, experiments are conducted for three different work piece materials to see the effect of work piece material colour change. Model equations have been developed, in terms ofthe machining parameters, image parameters and machining and image parameters using response surface methodology on the basis of experimental results. The experimental result indicates that the surface roughness of milled surfaces could be estimated/predicted with a reasonable accuracy using machine vision.

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P. Prabhakara Rao ¹, G. Chakravarthy ², A. C. S. Kumar ³, B. Balakrishna ⁴

Affiliations
1 V. R. Siddhartha Engineering College, Vijayawada, IN
2 Murthy Institute of Technology & Science, Keesara, IN
3 JNTU, Hyderabad, IN
4 JNTU Pulivendula, Kadapa, IN

Abstract

Residual stress in aluminum 7% silicon, 0.5%mg alloy castings has been evaluated by X-ray diffraction. Straight bar and flanged bar castings are produced in green, sand mould, sodium silicate-co₂ mould and EPC mould, specimens are taken from different location of castings and these specimens are analyzed for residual stresses in X-ray diffractometer. Flanged bar castings have more residual stresses then straight bar castings. Most of the stresses are tensile in nature. As for the type of mould is concerned, the residual stresses are increasing in the order of green sand mould, sodium silicate-co₂, mould and EPC mould, residual stress in the flanged bar castings is not limited to the location of casting.

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P. Prabhakara Rao ¹, V. Sri Sampath ¹

Affiliations
1 Department of Mechanical Engineering, Kakatiya Institute of Technology & Science Warangal-506015, IN

Abstract

The present work describes a conceptual study of performance enhancing devices for an airfoil by using Computational Fluid Dynamics. Two simple passive devices are selected and examined for Lift improvement and for decrease in Drag. The motivation behind this project is to study these effective techniques to improve performance with fewer drawbacks then previously existing model. The effective position for the location of Dimples and Cylinder are found out. Among the two selected models, Dimple model shows good results compare to other. The CAD model is prepared in CATIA V5 R19, pre-processing is done in ANSYS ICEM CFD 14.0 and simulations are carried out in ANSYS FLUENT 14.0. The overall aim of the project is to improve airfoil performance at high angle-of-attack. The results justify the optimum position for placing Dimple and cylinder for enhancing airfoil performance.

Keywords

Airfoil, Angle of Attack, Coefficient of Lift, Dimple.

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