食品货架期预测动力学模型及其应用

食品的货架寿命动力学可实现食品贮藏、流通过程中货架期的预测.本文简述了预测食品货架期的常用方法、数学模型的原理及在实践中的应用.     

延长广式香肠货架期的研究

研究了广式香肠在加工和贮藏过程中酸价、过氧化值、菌落总数的变化规律,进行添加物试验,以正文法优选出最佳方案:PC为0.01％,20A为0.06％,PHB为0.01％,EHB为0.01％,在35℃下采用真空包装,贮藏期达到20天,比对照组提高近2倍,且对风味和色泽无影响。     

延长广式香肠货架期的研究

研究了广式香肠在加工和贮藏过程中酸价、过氧化值、菌落总数的变化规律,进行添加物试验,以正交法优选出最佳方案：PC为0．01％,20A为0．06％,PHB为0．01％,EHB为0．01％,在35℃下采用真空包装,贮藏期达到20天,比对照组提高近2倍,且对风味和色泽无影响。     

延长搅拌型酸乳货架期的技术研究

采用正交试验探讨了原料乳的杀菌方式、稳定剂(耐酸CMC)和抑菌剂(乳酸链球菌素Nisin)的使用对搅拌型酸乳货架期的影响,在此基础上对加糖量,发酵剂的接种量和发酵时间对产品货架期的影响进行了探讨.结果表明延长搅拌型酸乳货架期的最佳工艺和配方参数为原料乳的杀菌方式为80℃、30min,耐酸CMC的添加量为0.1%,乳酸链球菌素(Nisin)的添加量为0.05%,蔗糖的添加量为7.5%,发酵剂的接种量为5%,发酵时间为3.5h.     

延长活性乳酸菌饮料货架期的技术探讨

本文对如何延长活性乳酸菌饮料货架期,从原料、生产、卫生、运输等方面进行了叙述,重点探讨了活性乳酸菌饮料常见的坏包、分层沉淀、酸度上升等质量问题,通过对比分析其产生原因,结果证明创建良好的生产规范,及生产、销售过程中冷链的完善建立,是延长产品货架期的根本.     

浅析电网负荷预测方法及其实现

电网负荷预测对于电力市场各方的正常运作均具有重要的作用,本文在讨论了其重要性的基础上,探讨了负荷预测的种类及预测的步骤,详细地介绍了负荷预测的传统方法及新技术,及负荷预测技术的发展动态。     

预测方法研究

随着全球经济一体化进程的加快,未来的市场考虑到受能源,政治,文化,战争……等因素的影响,将会越来越不稳定,需求的 波动性相比现在只会越来越大.预测作为一种对未来可能发生情况的预计与推测,将会日益显示出它的重要性.     

江苏地区酸奶中酵母菌的污染状况及货架期内污染状态变化分析

[目的]调查江苏地区生产的酸奶中酵母菌的污染状况以及受酵母菌污染的酸奶在货架期内的状态变化。[方法]在一年的四个季度分别对从企业成品库抽取酸奶进行酵母菌计数检验,并对在不同环境下保存的酸奶中酵母菌生长速率进行比较。[结果]受调查酸奶的酵母菌总体合格率为90%,其中第三季度（7-9月）的合格率为80%,为四个季度中最低;风味（果粒）酸奶的酵母菌污染率（19.15%）明显高于原味酸奶的酵母菌污染率（1.89%）;货架期内20℃环境下保存的酸奶中酵母菌生长速率明显高于4℃保存环境下的生长速率。[结论]环境温度及果粒的杀菌工艺对酸奶中酵母菌的污染数量具有重要影响。应该加强高温季节生产环境的消毒和温控,并且对投入的水果原料应该进行巴氏杀菌预处理。     

A Measure of the Value of Marketing in Packaged Goods

This article presents an econometric methodology for use with scannerpanel data based on the multinomial logit model to estimate theconsumer welfare changes that result from changes in marketingactivity. Two applications of the model are presented: the value toconsumers of the introduction of the first plastic ketchup bottle andthe value of various changes to the choice set for yogurt, including abrand replacement, the addition of a new brand and a line extension.Consumer welfare gains associated with the changes, while statisticallysignificant, are very small.     

Shelf Life Date Extension of Fresh-Cut Salad: A Consumer Perspective

ABSTRACT

During the past decades, various technological applications relating to an extension of the shelf life of food products have been introduced. The adoption of such technologies in the fresh-cut salad sector is a key issue for the sustainable management of the supply chain. The aim of the study is to analyse consumers’ attitude towards fresh-cut salad with an extended shelf life date. The analysis was based on face-to-face interviews with 351 consumers living in Lombardy, one of the Italian provinces where the consumption of fresh-cut salad is high and characterized by good margins of development. Principal component factor analysis with varimax rotation was used as preliminary data preparation for market segmentation. Cluster analysis revealed the presence of three different consumers groups. Only the cluster of ‘favorable’ shows a positive attitude towards the extended shelf life date. Consumers grouped in the cluster of ‘skeptical’ associate such innovation to a low level of product freshness. The cluster of ‘mistrust’ reveals the presence of consumers with safety concerns towards the prolongation of the shelf life date. Such consumers do not reveal a high level of trust in processing firms and their related brands.     

Prices of Unpackaged and Packaged Foods

Prices of packaged and unpackaged items sold in the same retail out-let were compared in 19 northern California supermarkets. The magnitude of potential price savings depended upon the size and type of product purchased. Savings would most likely accrue to the purchaser of small rather than large quantities of unpackaged products. The future of unpackaged foods is linked to technical developments in sealed dispensers that limit customer access to the product.     

提高食品检验检测能力为生活保驾护航

食品行业关系着人们日常生活,随着社会经济的不断发展,我国人民的物质文化生活水平得到了显著提高,而对于食品行业的安全问题越来越重视。本文主要就食品安全问题进行分析,分析我国食品检验检测工作的现状,为如何提高食品检验检测能力提出一些对策,以期能为人们的生活保驾护航,促进食品行业的可持续发展。     

包装饮用水铜绿假单胞菌的污染与预防

为更好地预防控制铜绿假单胞菌污染包装饮用水,保证包装饮用水安全。本文摸底包装饮用水中铜绿假单胞菌的污染情况,从水源、生产工艺、储存容器和生产环境等环节分析污染原因,并提出预防措施。     

我国寿险公司效率测度及其动态变化的实证分析

本文运用数据包络分析方法(DEA)和Malmquist指数对我国13家寿险公司2002～2007年的技术效率、纯技术效率和规模效率以及全要素生产率变动进行了测度.结果发现,我国寿险公司技术效率普遍较低,整体上是由纯技术效率和规模效率的低下共同导致的,而规模效率对技术效率的影响更大.在DEA无效的寿险公司中,合资企业居多数.分为SE主导型和PE主导型.同时,本文运用Malmquist效率指数刻画了我国寿险公司生产效率的动态变化,并将各公司划分成四种增长类型,并通过对生产有效性的"追赶效应"和"前沿面移动效应"的分解,得出不同增长类型公司效率动态变化的推动因素.     

Factors Affecting Retailer Acceptance of New Packaged Goods:

Packaged goods manufacturers develop and introduce several different types of new products including innovations, "me-too" prodcuts, and line extensions. The authors build a theoretical model to help understand the retailer new product acceptance process for different types of new products. Factors influencing retailer acceptance of new packaged goods were identified and tested. Statistical comparisons of factors were performed across different types of new products and within a particular type of new product to develop a relative ranking of the most influential factors. The results show that many of the factors affecting retailer acceptance of different types of new products are under the control of the manufacturer. The results also show that the retailer new product acceptance process varied significantly from one type of new product to another. Implications for theory and practice, and directions for future research, are discussed.     

包装饮用水中铜绿假单胞菌的检测方法

该文同时使用乙酰胺琼脂平板和CN琼脂平板,用GB/T8538-2008中的方法检测包装饮用水中的铜绿假单胞菌。结果显示,增加使用乙酰胺琼脂平板,可以减少或避免检测结果出现假阴性。