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S. D. Bhardwaj , A. K. Chakraborty

Abstract

In two years study, the overall perfonnance of Terminalia bellirica and T. chebula seedlings in the nursery were found better, when seeds were collected in first fortnight of January and sowing was done at last week and third week of March respectively. Presowing seed treatment on germination and growth of seedlings of T. bellirica produced better result when the seeds were soaked in concentrated sulphuric acid (H₂SO₄) for 12 minutes. The germination and growth of seedlings of T. chebula were maximum when the seeds were soaked in cold water for 24 hours before 5 week stratification in cowdung.

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S. D. Bhardwaj , A. K. Chakraborty , N. K. Joshi

Abstract

Tbe cuttings of Terminalia bellirica were planted in the month of July, October and March but all the cuttings were failed irrespective of month of planting hormone treatments and portion of the cuttings. This species can be categorised as under obstinate to ischolar_main under field condition. The cuttings of T chebula planted in July and October failed completely. While in March, the middle portion of the cuttings with combination of 400 ppm IBA produced the better results.

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R. K. Nath ¹, A. Chakrabarti ¹, A. K. Chakraborty ¹

Affiliations
1 Department of Chemistry, Calcutta University Post Graduate Centre, Agartala, Tripura-799004, IN

Abstract

Interaction of cationic dye pinacyanol chloride with bacterial cell surface capsular polysaccharide isolated from Klebsiella K40 has been spectrophotometrically Investigated. The capsular polysaccharide of Klebsiella K40 is a heteroglycan which consists of pentasaccharide repeating units comprising one residue each of unsubstituted mannose, 4-substituted glucuronic acid, 3-substituted galactose, 2, 4-disubstituted rhamnose, and 2-substituted rhamnose. It Induces a metachromatic blue shift in the visible spectrum of the pinacyanol chloride from 600 nm to 500 nm. The metachromatic spectral changes have been studied during interaction of the dye cation with the polyanion at different polymer/dye molar ratios. A stochiometry of 11 for the polymer/dye has been found to exist in the polyanion-dye compound. The complete reversal of polymer-induced metachromasy has also been observed by the addition of ethanol and urea.

Keywords

Pinacyanol Chloride, Poly Saccharide, Metachromasy.

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A. K. Chakravarti ¹, S. B. Chowdhury ¹, A. K. Chakraborty ², T. Chakrabarty ¹, D. C. Mukherjee ¹

Affiliations
1 Department of Pure Chemistry, University College of Science and Technology, Calcutta University, 92, Acharya Prafulla Chandra Road, Calcutta 700009, IN
2 Department of Mathematics, Nimta High School, Calcutta 700049, IN

Abstract

The multiple emulsion membrane process of separation, purification, etc. has been reviewed. The technique of membrane preparation, derivation and technical discussion of different mathematical formulae (asing Fick's first law of diffusion) in connection with the simple and carrier transport with or without chemical reactions, coupled co- and counter-transports and primary active transport have been described and related experimental studies referred to. The unsteady state behaviour of the emulsion droplets in regard to mass transport has been discussed. The hollow-sphcre, all holes filled-all holes empty, and reaction-site models suggested so far in view of harmonizing the experimental observations with the Fick's 2nd law have been mentioned. The recently proposed reaction-site model for high viscous emulsion droplets has been considered in some details. The potential applications of the liquid membrane multiple emulsion process in the technology of separation have also been discussed.

Keywords

Liquid Membrane, Multiple Emulsion, Separation Models, Applications.

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A. K. Raina ¹, A. K. Chakraborty ¹, C. Bandopadhay ¹

Affiliations
1 Central Mining Research Institute, Regional Centre, 3rd Floor, MECL Complex, Seminary Hills, Nagpur-440 006, IN

Abstract

No Abstract.

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A. K. Raina ¹, P. B. Choudhary ¹, M. Ramulu ¹, A. K. Chakraborty ¹, A. S. Dudhankar ¹, V. Udpikar ², N. Ghatpande ³, D. D. Misra ¹

Affiliations
1 Central Mining Research Institute, Regional Centre, 54-B, Shankar Nagar, Nagpur - 440 010, IN
2 Wavelett Group, Unit No. 1, Plot No. 59, Amchi Colony, Survey No.1, Bawdhan, Pune - 41 1 021, IN
3 Wavelett Group, Unit No. 1, Plot No. 59, Amchi Colony, Survey No.1, Bawdhan, Pune - 411 021, IN

Abstract

Grain size analysis is important in many fields such as sedimentology and mining. In blasting, quantifying size and distribution of fragmented rock poses a great problem to the blaster. Grain size and its distribution have a direct effect on the economy of the mining operation. The analysis may be easily done with sieve if sample is of small size. However, extensive sieving is not possible in either of the cases and particularly in blasting, where the amount of muck is quite large, With application of the digital image analytical techniques, the process has been simplified. Several such systems are in vogue throughout the world. Central Mining Research Institute (CMRI), Nagpur Centre in association with Wavelet Group of Pune, devised such a system (FRAGALYST V.l.0, 2.0) indigenously, to measure blast fragmentation. Major features of the system are discussed with its utility. Application of the same has been proved effectively in improving the efficiency of some mines in India. The system is 50 to 60 percent cheaper than imported ones. Future developments and application of the system to sedimentological calculations is also discussed. Few exercises conducted by the authors have shown that the results of sieve analysis and data provided by the FRAGALYST are comparable to reasonable degree of accuracy.

Keywords

Digital Image Analysis, Grain Size, FRAGALYST Software, Blast Fragmentation, Sedimentary Analysis.

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T. Bhattacharya ¹, A. K. Chakraborty ¹, K. Pal ²

Affiliations
1 Department of Electrical Engineering, NIT Agartala, IN
2 Department of Mechanical and Industrial Engineering, IIT Roorkee, IN

Abstract

An equation has been developed to measure the efficiency of PV module instantly, if the climatic parameters of the area are known. The measured and calculated values of efficiency are verified to check the percentage error between them. It is observed that developed equation has very correlation with the measured values.

Keywords

PV Module Efficiency, Ambient Temperature, Wind Speed, Solar Radiation, Relative Humidity, Correlation.

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T. Bhattacharya ¹, A. K. Chakraborty ¹, K. Pal ²

Affiliations
1 Department of Electrical Engineering, NIT Agartala, IN
2 Department of Mechanical and Industrial Engineering, IIT Roorkee, IN

Abstract

The production of PV power depends on different meteorological parameters. Accumulation of dust is one of the factor which reduces the output power. The recent study was done in Tripura, India and there is maximum of 13% and minimum of 9% reduction in efficiency has been observed during the period of experiment.

Keywords

Photovoltaic, Dust, Open Circuit Voltage, Short Circuit Current, Module Efficiency, Degradation in Efficiency.

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