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采用近红外光谱技术可实现对食用植物油脂的快速分类检测、品质检测以及预测掺伪检测。主要是运用近红外光谱技术建造定标模型,首先实现基于不同种类食用油的分类甄别,然后实现对油脂品质进行多方面指标的快速分析,辅助对不同油样种类进行掺伪量预测。本文结合对其科学研究现状以及检测技术实践应用过程进行论述。 相似文献
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为研究快检试剂盒在检测蔬菜中重金属汞含量中的适应性,随机选取阿克苏市当地市售蔬菜为检测样品,实验采用国家标准《食品安全国家标准食品中总汞及有机汞的测定》(GB 5009.17—2014)第一法原子荧光光谱分析法作为参比方法,选取重金属汞快速检测试剂盒,根据《食品快速检测方法评价技术规范》对其快检适应性进行评估.结果表明... 相似文献
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本文根据化验室仪器配置实际情况,选取谷物快速水分测定仪、定温定时烘干法、近红外检测仪和卤素快速水分测定仪检测进口大豆水分含量,以国家标准105℃烘箱法为标准比对4种不同仪器方法检测结果,选出适合粮库不同检测需要的检测方法。依据大量比对试验的数据结果选择出准确度最高的快检方法为卤素快速水分测定仪法,设计3因素2水平正交试验,比较3因素对水分结果的影响大小及各因素下准确性高的最优水平,对试验结果进行方差分析,从精密度和准确性两方面确定使用卤素快速水分测定仪检测进口大豆的最佳条件为设定温度120℃、称样量6 g和粉碎粒度20目,从而指导企业生产应用。 相似文献
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《国际粮食与农业综合企业市场学杂志》2013,25(2-3):99-109
Abstract Peanut meal is cross-hedged with soybean meal using peanut meal cash prices and soybean meal futures prices. Hedge ratios are obtained for a 3-year and a 6-year period model. The data is from 1993 to 2000, with the 2000 data used for evaluation. All hedge ratios are significant and the 3-year period model's results suggest that long term data sets have less explanatory power than short-term hedge ratios. Evaluation results indicate positive gains for cross-hedged poultry producers and/or peanut producers. The empirical analyses suggest that soybean meal futures can be used as a potential cross-hedging vehicle for peanut meal. 相似文献
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Aquaculture growth has led to worries about overfishing and reduction in wild‐caught food fish supply because of increased demand for fish meal. As such, the price ratio between fish meal and soybean meal has received much attention as an indicator of changing market conditions. In recent years, the price ratio between these two commodities has become more volatile. Several authors have suggested that the traditional relationship between fish meal and soybean meal has broken down and that this is evidence of increased demand pressure on fish meal. In this article, we investigate the hypothesis that there are two regimes for the relative price between fish meal and soybean meal. The empirical results support this hypothesis, with the low‐price regime representing the traditional stable relative price. The continued linkages between the fish meal and the soybean meal markets indicate that aquaculture is reducing its dependency on marine proteins in favour of vegetable proteins. 相似文献
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《国际粮食与农业综合企业市场学杂志》2013,25(3):25-43
The relationship between canola prices and soybean complex futures prices were analyzed following standard minimum variance methods for measuring hedging effectiveness. Canola may be effectively cross-hedged over a four week period in a composite of soybean oil and meal representing the commercial value of crushed canola. The effectiveness of cross-hedging declines somewhat for shorter time periods which is consistent with other studies. The Canada-U.S. Free Trade Agreement has altered the pricing situation for canola due to the 1991 accelerated tariff reduction agreement on seed for crushing and rapeseed oil. 相似文献
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目的:探讨同一方法用于不同种类食品中总灰分测定的可行性.方法:按照国家标准规定的两种灰分测定方法,选取不同种类食品分别进行测定.结果:标准规定的6类食品14种样品的灰分,均可以采用经酸处理过的坩埚,并加入助灰化剂测定,符合标准要求.结论:统一实验方法后,实验重现性较好,提高了日常检验效率. 相似文献
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This article introduces a new spatial price analysis methodology based on maximum likelihood estimation of a mixture distribution model incorporating price, transfer cost, and trade flow data. This method permits differentiation between market integration and competitive market equilibrium and derivation of intuitive measures of intermarket tradability, competitive market equilibrium, perfect integration, segmented equilibrium, and segmented disequilibrium. One can also use these estimates to derive semiparametric measures of time-varying regime probabilities to track changing market conditions. An application to trade in soybean meal among Pacific Rim economies demonstrates the usefulness of the method. 相似文献