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K. L. Chakraborty ¹, A. Bhattacharyya ¹, B. Roy ¹

Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta 700032, IN

Abstract

Study on the field-relations, petrography and chemical composition of gabbroanorthosite-granophyre-leucogranite suite supports a co-magmatic origin of these rocks.

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H. A. Molla ¹, B. Roy ¹

Affiliations
1 Botanical Survey of India, Howrah, IN

Abstract

The paper deals with ethnobotanical uses of 30 plants belonging to 20 families which were reported by the tribals viz. Mech, Rabha, Nepali, Oraon and Munda. The information may be useful for further studies since most of the uses are less known to other societies.

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B. Roy

Abstract

Welding, a process of joining two identical materials by the application of heat or pressure or both with or without filter material to produce a localised union through fusion or recrystallization across the interface, has got different approach from people of different trade. To a designer, it is joint efficiency, to metallurgist, it is the metallurgical structure composition and identity of the weld deposit and last but not the least, to an welder it is how comfortably a deposit without defect can be made.

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A. Mandal ¹, S. Samanta ¹, K. Roy ¹, B. Roy ¹, K. Astitwa ¹

Affiliations
1 Dept. of Mechanical Engg., North Eastern Regional Institute of Science and Technology, Nirjuli, IN

Abstract

Pulsed Nd:YAG laser beam has great ability for micro-machining of ceramic materials because of high laser beam intensity at low mean beam power, good focusing characteristics due to very small pulse duration, small kerf widths and narrow heat affected zones. In the present research, micro-grooving of alumina ceramic plate by pulsed Nd:YAG laser beam machine is studied. Selection of optimum machining parameter combinations for obtaining accuracy is the challenging task in laser micro-grooving operation. Nowadays several numerical methods are widely used for either modeling or optimizing the performance of the manufacturing technologies. That has been advanced due to the large diffusion of the personal computer and the numerical algorithms. This paper represents an attempt to develop an appropriate machining strategy for obtaining most accurate dimension of the micro-groove and to prepare a database for assistance during laser micro-grooving operation. A feed-forward back-propagation neural network is developed to model machining process. The three most important process parameters-lower width, upper width and depth of the groove-have been considered as measures of process performance. The model is capable of predicting the response parameters as a function of five different control parameters i.e. lamp current, pulse frequency, pulse width of the duty cycle, assist air pressure and cutting speed.

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Rai H. N. Chaudhuri ¹, H. A. Molla ¹, D. C. Pal ¹, B. Roy ¹

Affiliations
1 Botanical Survey of India, Howrah, IN

Abstract

The paper deals with 30 selected species of plants e.g. Costus speciosus (Keen.) Sm., Drynaria quercifolia (L.) J. Sm., Melastoma malabathricum L., Mimosa pudica L., Pedilanthus tithymaloides (L.) Poit., Premna latifolia Roxb., Solanum viarum Dunal, Thelypteris arida (D. Don) Morton, etc. which are used as medicine by some of the tribals like Mech, Rabha and Oraon of the Jalpaiguri District of West Bengal in their traditional system of treatment.

Ethnobotanical field study reveals some interesting information about mode of their uses of plants in various ailments either single or in combination with other plant parts. It has been observed that though these tribes are living under same environment and using the same species of plants for curing disease, their Prescriptions are quite different. This indicates that the tribes are still retaining their own tradition so far as treatments are concerned.

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