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铜元素在食品中广泛存在,是人体不可或缺的微量元素,如果缺乏铜会对人体造成很大的危害,导致神经系统失调,大脑功能发生障碍。本文综述了分光光度法、原子吸收光谱法、电感耦合等离子体发射光谱法等测定铜含量的方法。 相似文献
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煤焦油是煤干馏状态下所生成的副产品,其化学构成十分复杂,其中酚类、芳香烃和杂环化合物所占的比重最大。而酚类化合物作为有害物质,它的存在会降低煤焦油的品质,与此同时它还是一种珍贵的资源物质,可以生产出很多的工业产品。基于此将酚类化合物从煤焦油中有效提取具有双赢的效应。本文通过对酚类化合物的提取研究,旨在为煤化企业综合利用煤焦油提供些许助力或参考。 相似文献
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含油脂食品货架寿命研究方法 总被引:4,自引:0,他引:4
高油脂食品是一种具有独特风味、深受人们喜爱的食品。由于它具有口感好、香浓、酥脆、营养素损失少、花化样各异和易于消化吸收等特点,因此吸引着各类人群,尤其是青少年和儿童的。高油脂食品已在人们的食品消费尤其是零食消费中占据了一席之地。[编者按] 相似文献
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Leonard Mizzi 《Food Policy》1995,20(6)
Food and nutrition policy in Malta was officially endorsed by Government in the late 1980s. The urgency stemmed from the increasingly preoccupying health situation of the Maltese population characterized by the higher rates of cardiovascular diseases and neoplasms. Although a small island in the central Mediterranean, Malta does not have a diet that is characteristic of the rest of the Mediterranean region. The main aim of this paper is to outline the main characteristics of Maltese food consumption and the constraints encountered in the process of implementing the food and nutrition policy. The final section provides some recommendations that could also be considered in other Mediterranean countries that are in the process of designing or implementing similar policies. On the eve of the 21st century and in light of Malta's eventual accession in the European Union, several fundamental measures still need to be introduced and enforced, the most important being those concerning food safety and quality. 相似文献
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食品零售业中的包装流通评价方法 总被引:1,自引:0,他引:1
包装物流是一个较新的领域。包装技术系统能够确保物品完好、安全、快速地送达顾客手中,并使包装材料能够以最小的成本回收、利用和处理。物流的目的就是能够有计划地实施高效低成本的原料流动和存储,使成品和相关信息按照顾客的要求送到他们手中。包装物流可定义为:通过包装系统和物流系统之间的相互作用和内在联系,将两者有机地结合起来,形成一个能使产品增值的同一系统。 相似文献
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高粘度稠油开采方法的现状与研究进展 总被引:23,自引:0,他引:23
论述了目前国内外正在研究和使用的各种高粘度重质稠油的开采方法,比较了其优缺点,认为微生物法和井下催化法具有十分重要的经济意义和社会意义。 相似文献
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T. Teklu 《Food Policy》1996,21(6):479-496
The recent empirical food demand studies on Sub-Saharan Africa show significant advances in demand specification and methodology, especially in the application of less restrictive and theoretically consistent flexible functional forms. The findings to date establish some broad patterns on effect of income, household demography and life cycle, location, and prices on food demand patterns. However, the numerical values of the demand estimates are less generalizable because of an insufficient number of data points to separate the true demand component from other confounding factors, which are linked to differences in modeling and estimation of demand relations. The priority for future research is to generate sufficiently detailed demand estimates that have a high utility for disaggregated policy analysis, but are based on a theoretically consistent and comparable methodology. 相似文献
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介绍了一个不需分离直接测定矿石中钽的方法。样品经过氧化钠分解,选择最佳试验条件,基于钽与孔雀绿萃取显色进行测定,方法快捷、简便,具有实用性。 相似文献
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Recent incidents of contaminated food products coupled with the widespread diffusion of news by mass media and the growing social concerns about food safety, have resulted in significant food market crises. One of the most highly publicized recent food scares involved Bovine Spongiform Encephalopathy (BSE). In our analysis, we evaluate the impacts from a BSE outbreak on the price volatility transmission along the Spanish food marketing chain by using a smooth transition conditional correlation (STCC) GARCH model. Our work is the first to assess price volatility responses to food scares. Results suggest that two distinct regimes involving different price volatility behavior can be distinguished, one characterized by turbulent markets and another where markets are calming down. 相似文献
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为了提高减压拔出率,改善减压塔的产品分布,分析了减压塔运行存在的问题,提出了提高减压拔出率的措施,包括对减压塔顶抽真空系统进行技术改造,大修更换洗涤段所有填料,对主要运行参数进行优化调整。经过技术改造和工艺调整后,减压塔顶真空度提高了4 kPa,全塔压降从4.56 kPa降至1.58 kPa,减压蜡油拔出率提高了8.80个百分点。常减压装置的长周期运行得以保证,取得了显著的经济效益。 相似文献
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蔡荣 《地质技术经济管理》2009,(5):39-42
包装在保护食品质量安全的同时,也对资源和环境带来了破坏,甚至引发严重的生态问题。文章以食品包装作为研究对象,分析食品进行包装的必要性及包装对环境的负面影响,对当前我国食品包装中存在的问题进行系统的探讨,分析我国食品包装环境污染的治理途径。研究认为,伴随着我国食品包装安全相关法律、法规的建设和实施,在制度框架内逐步实施环境管理的经济手段,同时重视环保意识等非正式制度的建设的作用,这将是我国治理食品包装问题的惟一可行的路径。 相似文献