Under the condition of deferred payment, the inventory model in two situations, taking into account the factors of unnatural loss, the demand for the inventory model depends on the product price and freshness, and finally the optimal order cycle and order price are obtained. At the same time, the impact of unnatural loss, product shelf life, deferred payment, procurement cost, inventory cost, ordering cost, and potential consumer on the retailer′s total profit is analyzed. Among them, the increase in unnatural loss, procurement cost, inventory cost and ordering cost makes the total profit of the retailer decline, the deferred payment and the increase in the number of potential consumers increases the total profit of the retailer, and the rise of the shelf life of the product makes the total profit of the retailer rise first and then decline.

随着经济时代的到来,创新人才日渐成为提高国际竞争力和综合国力的直接因素,大学生是否具备创新精神不仅关乎学生个人的成长与发展,而且也关乎中华民族的存亡兴衰。因此,高校必须担负重任,转变教育观念,分析大学生创新精神的现状,大力拓展培养大学生创新精神的渠道和方式。

大学生作为知识经济时代创新的主体,其非智力因素在创新过程中起着至关重要的作用。在培养和发展大学生创新精神的同时,应充分重视和大力发展他们的非智力因素,从责任意识、意志毅力、砺志勤学、艰苦奋斗、甘于奉献、勇于批判、开拓进取、实事求是和严谨认真几方面进行非智力因素的培育和发展,促使大学生的人格特征和精神状态与创新的实践活动更加和谐。