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外势场中玻色——爱因斯坦凝聚性质的研究 被引量:5
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作者 李秀平 刘文森 张国锋 《量子光学学报》 CSCD 2003年第1期27-31,共5页
(1)简要介绍BEC概念的一种含义及BEC形成的条件;(2)着重对外势场中的BEC作了研究,得出了低维情况下产生BEC的条件:当U(x)~xη时,一维情况发生BEC满足η<2;二维情况发生BEC满足η>0。
关键词 玻色——爱因斯坦凝聚 外势场 BEC 理想玻色气体 幂函数 量子系统 量子态 性质 碱金属原子
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外势场中玻色—爱因斯坦凝聚的统一论证
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作者 缪胜清 金绍维 易佑民 《安徽大学学报(自然科学版)》 CAS 2000年第2期44-51,共8页
研究了在幂函数势场中n维气体粒子的态密度公式 ,并讨论了n维理想玻色气体的玻色—爱因斯坦凝聚。
关键词 玻色-爱因斯坦凝聚 理想玻色气体 外势场
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外势场中理想玻色气体的玻色-爱因斯坦凝聚的热容性质
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作者 罗国忠 《甘肃联合大学学报(自然科学版)》 2007年第4期50-51,共2页
研究了在任意空间外势场中理想玻色气体的玻色-爱因斯坦凝聚问题,从而计算热容量且讨论了热容量性质.
关键词 外势场 玻色气体 玻色-爱因斯坦凝聚 热容
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Using Wheat Futures to Stabilize the Cost of Raw Material in Bakery Sector
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作者 Slawomir Juszczyk Rafat Balina 《Chinese Business Review》 2012年第6期529-534,共6页
The article presents the example of using relations between the price of wheat flour sold by the milling companies and the price of wheat futures listed on the FOREX market to protect the companies from bakery sector ... The article presents the example of using relations between the price of wheat flour sold by the milling companies and the price of wheat futures listed on the FOREX market to protect the companies from bakery sector against adverse price movements of raw material--wheat flour. The paper aims to present a method which can help to reduce risk of changes wheat flour price in the market by using wheat futures traded at FOREX market. For the analysis authors used weekly data since January 2006 until October 2010 about wheat flour price, wheat grain price, wheat futures prices, quotes a currency pair USD/PLN. Wheat flour prices came from studies of the Department of Agricultural Markets, Ministry of Agriculture, and Rural Development in Poland and represented the average sales price of wheat flour by milling companies. Information about wheat futures and quotes a currency pair USD/PLN reflects the actual trading of the FOREX market. Authors used statistical analysis tool for determining the strength of the relationship between the price of wheat flour and the wheat price on the domestic market and the wheat futures price. The correlation coefficient between them was 0.763. For further test authors used seven different options that use future contracts to reduce fluctuations in the flour price which can be used in bakery businesses. These results of research show that someone can effectively use wheat futures contracts listed on the FOREX market to protect the bakery business against adverse movements of wheat flour prices. Application in practice chosen strategies can allow bakery companies to achieve cost advantages by reducing the adverse changes in the wheat flour prices. Chosen strategies are more efficient if the prices of flour in the domestic market are rising. If prices drop down, the effectiveness of using wheat futures contracts was lower. It should be noted that wheat futures contracts are a good tool to achieve cost advantages in the bakery industry, especially when the wheat flour prices are increased on the domestic market. 展开更多
关键词 futures contracts wheat futures cost of raw material market risk cost advantage FOREX market
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