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The purpose of this study is finding a solution to optimal quantities of concurrent spare parts(CSP) which are acquired for using considerably long time. To solve the problem, this paper proposes a new CSP model which can be used in permitting backorder flexibly. Through the simple experiment, we validate the mathematical model which is suggested in this paper. Also, we determine the purchasing quantities of each item minimizing total system costs under an available budget constraints.

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Parthenin was extracted from Parthenium hysterophorus L. leaves growing in northern part of India, and its effect was tested on the seed germination parameters and other related characteristics of Ageratum conyzoides L. weed. Parthenin proved phytotoxic to A. conyzoides as most of the studied parameters were inhibited. It may lead to a possible biological eradication of the A. cpnyzoides weed.

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