Informatics Publishing Limited

J. Saha ¹

Affiliations
1 Indian Statistical Institute, Calcutta 35, IN

Abstract

Mentions the principal reprographic methods in current use. Indicates the value of microphotographs in the preservation of valuble and rare documents, and in inter-library loan. The problems and principles of administering a reprography department and the need for co-operation among reprography centres are emphasized. Gives data on the reprography centres in India. Suggests methods of co-operation in reprography.

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Syed Arshad Hussain ¹, Arpan D. Roy ¹, J. Saha ¹, Dibyendu Dey ¹, D. Bhattacharjee ¹

Affiliations
1 Department of Physics, Tripura University, Suryamaninagar-799130, Tripura, IN

Abstract

This communication reports the phenomenon of fluorescence resonance energy transfer observed in between the binary solution of two laser dyes acriflavine (donor) and rhodamine B (acceptor), with and without nano-clay (laponite). It was observed that presence of clay particles increases the energy transfer efficiency. The effect of acceptor concentration on the total energy transfer efficiency has been studied to quantify the energy transfer, which may be used for photon emission and enhancement in lasing efficiency.

Keywords

Rhodamine, Laponite, Acriflavine, FRET.

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Chinmay Jodder ¹, J. Saha ²

Affiliations
1 New Allenberry Works, Kolkata, IN
2 Production Engineering Dept., Jadavpur University, Kolkata, IN

Abstract

Planetary gear transmissions are compact, high power transmitting speed reductions technology. Structural analysis of three stage coupled planetary gear train is reviewed. This analysis depicts the fast and easy determination of the speed ratio, torques, and efficiency and power flow directions of coupled planetary gear trains. Three stage efficiency determined.

Keywords

Efficiency, Planetary Gear Trains, Structural Analysis, Lever Analogy, Torque, Ratio.

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