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C. Maya Das , N. K. Das

Abstract

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B. C. Acharya ¹, S. K. Das ¹, R. K. Sahoo ¹, B. C. Patnaik ², N. K. Das ³

Affiliations
1 Regional Research Laboratory, Bhubaneswar 751 013, IN
2 Directorate of Mines, Govt. of Orissa, Bhubaneswar, IN
3 Orissa Remote Sensing Application Centre, Bhubaneswar, IN

Abstract

Tin along with Nb and Ta occurs both as primary mineral in pegmatites and as detrital mineral in the colluvial, eluvial and alluvial placers in Matili-Mundaguda area of Koraput District, Orissa. Cassiterite is commonly associated with soda plagioclase, microcline, perthite, quartz and muscovite, and it invariably contains inclusions of columbite-tantaIite, tapiolite, pyrochlore and fergusonite varying from 0.4 to 18% by volume and 3 to 400 microns in size. Minerals, like ilmenite, magnetite, lepidolite, pyrite, chalcopyrite and sphalerite are also associated with cassiterite. Nb and Ta is present in cassiterite both in solid solution as well as separate mineral phases.

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K. K. Das , P. K. Sahu , N. K. Das ¹

Affiliations
1 Central Sericulture Research & Training Institute, Baharampur, West Bengal- 742 101, IN

Abstract

Constrained by limited resources, the sericulturists often fail to achieve the optimum level of income, mainly due to their inability in making judicious allocation of resources at their disposal. The study attempts to identify some of the major factors of production (both in mulberry cultivation and rearing of silk worm) in Murshidabad district of West Bengal. one of the three major sericultuyal distriels in the State. The significant inputs for different size groups (classified on the basis of total operational land holding) have been idemified The study idemifies that though organic manure, irrigation, labour (in cultivation of mulberry plant), purchase of Disease Free Layings (DFLs) and rearing appliances are the most common and significant factors of production in the district, judicious allocation of inputs is the need of the hour. Input use efficiency of the various factors of production has been judged with the help of Marginal Value Productivity(MVP) concept.

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N. K. Das

Abstract

Cement is defined as a product obtained by-intimately mixing together calcarious and argillacious materials; burning them at a dinkering temperature and grinding the resulting clinker. After burning no material other than gypsum or air entraining agent is added.

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