SPE-ICP-MS同时测定高盐食品中15种稀土元素

本研究建立了固相萃取-电感耦合等离子体质谱法测定高盐食品中15种稀土元素。样品经微波消解,赶酸后用0.1 mol/L醋酸铵缓冲溶液调节pH值,通过Inertsep Me-1固相萃取柱,去除氯化钠等盐分,吸附样液中的稀土元素,再经2 mol/L硝酸洗脱后,进入电感耦合等离子体质谱仪测定15种稀土元素。本研究所建立的方法能降低盐分对检测的干扰,定量准确,适用于高盐食品中稀土元素的测定。     

Combating deceptive advertisements and labelling on food products – an exploratory study on the perceptions of teachers

People are becoming more health conscious nowadays, but most of them are not able to adopt a lifestyle with adequate physical exercise and a healthier eating pattern. Many attempt to compensate by taking ‘health foods’. Despite the recent economic recession, the functional food market is expanding rapidly in Asian countries. Recent statistics indicate a huge increase in weight loss and functional food product advertising expenditure in Hong Kong and other Asian countries. In a large scale survey conducted by the Hong Kong Consumer Council on advertisements, it was found that 85% of the medicines, health food and therapies sampled contain questionable claims and misleading messages, which was the second most problematic category of the survey. In addition, young people do not understand much about modern food processing, in particular with regard to low energy and functional foods, and they know very little about modern food marketing strategies. The situation is potentially detrimental to consumer welfare, especially to the younger generation. This study was conducted to reflect critically on implications of the issue on the health and well‐being of young people in Hong Kong. Attempts are made to explore directions for designing relevant and effective education programmes to empower young people's abilities in understanding food advertising strategies and making informed decisions on food choice. This paper begins with a critical review of the current situation with regard to Hong Kong. Then, the results of an interview survey and a questionnaire survey on pre‐service and in‐service teachers’ perception towards misleading food advertising and labelling are reported. The situations at schools are defined and problems faced by teachers in providing relevant consumer education programmes to students are identified. Finally, some prospective foci for further investigation of this important issue, with a view to developing students’ critical skills in evaluating claims offered in food advertisements, will be considered.     

Testing Multiple Non-Nested Factor Demand Systems

This article explains how to obtain straightforward extensions of the most popular univariate non‐nested statistics, and of the RESET‐test, to a multivariate context and examines how to use these tests to compare alternative factor demand systems. The empirical application involves the classical Berndt–Khaled KLEM data set. A statistically adequate specification is determined for each competing factor demand system. The empirical results are interpreted for each system, the models are compared on the basis of multivariate paired and joint non‐nested procedures and practical indications about what to expect if these tests are applied to alternative factor demand specifications are provided.     

Instrumental variable estimation based on grouped data

The paper considers the estimation of the coefficients of a single equation in the presence of dummy intruments. We derive pseudo ML and GMM estimators based on moment restrictions induced either by the structural form or by the reduced form of the model. The performance of the estimators is evaluated for the non-Gaussian case. We allow for heteroscedasticity. The asymptotic distributions are based on parameter sequences where the number of instruments increases at the same rate as the sample size. Relaxing the usual Gaussian assumption is shown to affect the normal asymptotic distributions. As a result also recently suggested new specification tests for the validity of instruments depend on Gaussianity. Monte Carlo simulations confirm the accuracy of the asymptotic approach.     

功能金融、融资效率与中小企业融资——远图1号集合资金信托计划案例

本文通过对远图1号集合资金信托计划案例的分析。认为应充分发挥不同市场及成员的功能优势并有效加以整合,打破银行渠道单一间接融资的局限,实现功能金融对社会资源的高效配置,才能有效解决中小企业新的融资难问题。     

在“世界现代田园城市”视域下建设成都旅游产业功能区的思考

本文分析了田园城市是统筹城乡发展的一种城市化理想形态。在分析成都建设"世界现代田园城市"的内涵、发展战略步骤,阐述了成都如何建设旅游功能区的具体规划思路。     

对产业集群的反思

产业集群研究的一个重点就是探索集群存在的原因,西方学者倾向性地认为产业集群是竞争优势的重要来源。文章通过文献资料法和对比批判论证法对国外案例进行批判性分析来重新探讨西方主流观点的合理性。研究结果表明,功能性聚集和物理性聚集有着本质区别。以此为立足点来说明是否采用集群发展这个模式应该结合当地的具体实际情况来进行具体分析,切莫盲目模仿。     

功能金融理论与我国金融体系的稳定性和效率性

功能金融理论认为,金融体系具有便利清算和支付、聚集和分配资源以及分散风险的功能.一个稳定和富有效率的金融体系通过有效发挥这三大核心功能,能够极大地促进一国国民经济的增长.根据该理论,本文通过研究我国金融体系上述三大功能的发挥程度来判断其稳定性和效率性.大量实证资料表明,我国金融体系虽然能够最大限度地动员社会储蓄,便利各种交易的清算和支付,但是其储蓄-投资转化率低下,资源配置功能弱化,风险分散和转移能力不高.因此,应在提高投资转化率、创新金融工具和技术、建立高效融资平台、改善公司治理机制和信息披露机制等方面完善我国的金融体系.     

日语教学中的功能交际法

在日语教学中 ,合理使用功能交际法 ,实现语言素材情景化和教学过程的交际化 ,尽可能地为学生提供相关的接近交际的交际情景 ,可以提高学生的语言综合能力及交际能力。     

The influence of perceived credibility on purchase intention via competence and authenticity

Due to the significant role of authenticity in the restaurant business, restaurateurs proactively make authenticity claims. However, the literature has rarely examined whether customers view these claims as credible and how the credibility of these claims influences dining intention. Thus, this study examines customers’ perceived credibility of authenticity claims based on the authenticator claiming authenticity, restaurant ownership type, and restaurant history. Furthermore, utilizing trust-transfer theory, this study proposes and tests a model that links customers’ perceived credibility of a restaurant’s authenticity claims, perceived restaurant competence, perceived restaurant authenticity, and purchase intention. The results show that the authenticator of authenticity claims and restaurant ownership type influence the perceived credibility of authenticity claims. Additionally, the perceived credibility of authenticity claims influences customers’ dining intention indirectly through restaurant competence and constructed authenticity.