ABS塑料中含溴阻燃剂前处理方法的探讨

[目的]建立一种测定ABS塑料制品中含溴阻燃剂的方法.[方法]采用能量色散X射线荧光分析法以甲苯为提取溶剂,索氏抽提法提取ABS塑料制品中的总溴,再使用X射线荧光分析法测定溴含量.[结果]X射线荧光分析法的精密度实验(n=11)的RSD值均小于5.0%.     

ABS塑料中含溴阻燃剂前处理方法的探讨

[目的]建立一种测定ABS塑料制品中含溴阻燃剂的方法.[方法]采用能量色散X射线荧光分析法以甲苯为提取溶剂,索氏抽提法提取ABS塑料制品中的总溴,再使用X射线荧光分析法测定溴含量.[结果]X射线荧光分析法的精密度实验(n=11)的RSD值均小于5.0%.     

能量色散X射线荧光光谱法测定焊锡组成元素

对样品采用压片抛光制样，用能量色散X射线荧光光谱仪对市场上销售的常用焊锡成分进行测定分析，可获高准确度和高精密度的分析结果。测定值与化学法相符，重复6此测定元素组分的RSD小于1.5％.方法简便快捷仅为传统化学分析的1/10,检出限结果满意。     

X射线荧光光谱法测定铬矿中Cr、Fe、Ca、Si、S、P等元素

[目的]选定X射线荧光光谱法测定Cr、Fe、Si、S、P等元素的背景,找出谱线重叠的校正方法.[方法]采用熔融法制样,用X射线荧光光谱仪对铬矿中Cr、Fe、Si、S、P等组分进行测定,用理论α系数法进行基体效应和谱线重叠干扰校正.[结果] 用该法测定进口铬矿样品,其测试结果与化学分析值基本相符,回收率96.3%～103.2%范围.[结论]该方法简便、快速、准确,能满足日常分析要求.     

美国ASOMA仪器公司台式X射线荧光分析仪介绍

美国ASOMA公司已加入SPECTRO仪器集团.使本公司的XRF(X射线荧光分析)产品形成更加完整的系列. SPECTRO公司根据其多年的经验首先将偏振X射线应用于元素分析.创造性地开发了先进的能量色散X射线荧光仪,能量色散X荧光(EDXRF)可以在不破坏样品的情况下分析固体、液体、粉末、浆状物的化学成份.它的特点是不需样品制备,100秒内即可得到从Na-U的各种元素的分析结果.可使您从冗长的化学分析方法中解脱出来.     

美国ASOMA仪器公司台式X射线荧光分析仪介绍

美国ASOMA公司已加入SPECTRO仪器集团.使本公司的XRF(X射线荧光分析)产品形成更加完整的系列. SPECTRO公司根据其多年的经验首先将偏振X射线应用于元素分析.创造性地开发了先进的能量色散X射线荧光仪,能量色散X荧光(EDXRF)可以在不破坏样品的情况下分析固体、液体、粉末、浆状物的化学成份.它的特点是不需样品制备,100秒内即可得到从Na-U的各种元素的分析结果.可使您从冗长的化学分析方法中解脱出来.分析结果的高度可靠和优异的重复性可与波长色散(WDXRF)荧光仪的性能相媲美.大部分元素的最低检测限均低于1PPM.操作简便灵活,不需专业人员.如果选购无标样分析软件,可使仪器的校正更加简化.优异的性能价格比,能够大大地节省您的开支.ASOMA公司的X荧光分析仪是商品检验的最佳选择.     

美国ASOMA仪器公司台式X射线荧光分析仪介绍

美国ASOMA公司已加入SPECTRO仪器集团.使本公司的XRF(X射线荧光分析)产品形成更加完整的系列. SPECTRO公司根据其多年的经验首先将偏振X射线应用于元素分析.创造性地开发了先进的能量色散X射线荧光仪,能量色散X荧光(EDXRF)可以在不破坏样品的情况下分析固体、液体、粉末、浆状物的化学成份.它的特点是不需样品制备,100秒内即可得到从Na-U的各种元素的分析结果.可使您从冗长的化学分析方法中解脱出来.分析结果的高度可靠和优异的重复性可与波长色散(WDXRF)荧光仪的性能相媲美.大部分元素的最低检测限均低于1PPM.操作简便灵活,不需专业人员.如果选购无标样分析软件,可使仪器的校正更加简化.优异的性能价格比,能够大大地节省您的开支.ASOMA公司的X荧光分析仪是商品检验的最佳选择.     

波长色散X射线荧光光谱法同时测定氧化铁皮中的多种杂质元素

采用偏硼酸锂和四硼酸锂混合熔剂熔融法制样,波长色散X射线荧光光谱法同时测定了氧化铁皮中的铝、铜、钙、硅、镁、锰、钛、锌、磷等多种杂质元素。考察了熔剂、脱模剂以及预氧化条件等对熔片的影响;采用理论α系数校正了基体效应和元素间的干扰效应,方法的检出限在4.7-35.0μg/g之间。用本方法测定氧化铁皮试样中各杂质元素的相对标准偏差在0.4%-5.1%之间,分析结果与其他方法测定值一致。与化学法相比,该方法快速、简便、精密度好、准确度高。     

重量法测定硫酸钾中的硫含量

[目的]建立测定硫酸钾化肥中硫含量的方法,包括快速方法.[方法]用硫酸钡重量法测定硫酸钾化肥中硫含量,用坩埚烘干法代替灼烧法以缩短检测时间.[结果]用玻璃坩埚烘干法不能将BaSO4沉淀吸附的微量杂质和水分除去,烘干法的准确度不如灼烧法,但此检验结果表明,两种方法所得结果无显著性差异.[结论]本文的测定方法能满足商品检验的要求.     

X射线荧光光谱测定纯铜样品中微量和痕量杂质元素

以英国进口的纯铜标准样品制作工作曲线,采用专用的空白标样和多点多项式方法计算峰底背景.用干扰曲线法进行基体效应和谱线重叠干扰的校正,部分重金属痕量元素选择高反射率的人工晶体PX-9来测定,开发了用X射线荧光光谱测定纯铜样品中除Cu外18个痕量杂质元素的方法.用该方法测定纯铜标准样品,其测试结果与直读光谱测定值基本相符,回收率在95%～105%范围,各元素的相对标准偏差RSD%均小于5.0%     

Advertising standardisation in culturally similar markets

A framework for standardisation of ad content based on cultural and socio-economic similarity among countries is proposed. Advertising standardisation is investigated in the Arab world, a culturally similar setting with socio-economic differences among nations, by carrying out a content analysis of 949 ads from Egypt, Lebanon and the United Arab Emirates. Extant research suggests that, when advertising in culturally similar markets, advertisers use standardised advertising. We investigate two types of ad content – culturally normative and product-related – and show that culturally normative ad content, such as the depiction of women consistent with societal norms, is predominantly culture driven, and standardisation is appropriate, regardless of socio-economic differences. On the other hand, product-related content such as information content, the use of hedonic vs utilitarian appeals, and the provision of price information are influenced by both cultural and socio-economic factors. Hence, standardisation is not appropriate for productrelated ad content when socio-economic differences exist among culturally similar markets. Thus, conditions under which standardisation of the two types of ad content is appropriate are identified. Implications and suggestions for future research are also offered.     

气相色谱-质谱法测定脂肪酸组成鉴别地沟油的方法研究

建立了分析油脂样品中37种脂肪酸含量的气相色谱-质谱检测方法,通过对100多种植物油和20多种地沟油的37种脂肪酸含量的分析,总结出了根据37种脂肪酸含量鉴别地沟油的判定依据。低碳数饱和脂肪酸是地沟油与植物油差异较大的组分,但是应用气相色谱方法测定时无法对其进行准确的定性定量,从而无法根据低碳数饱和脂肪酸的组成进行是否地沟油判定。应用气相色谱-质谱方法,提高了方法的灵敏度,完善了根据脂肪酸组成判定地沟油的依据。应用该判定依据,对卫生部两次盲样进行判定,阳性准确率分别为100%和95%,阴性准确率分别为100%和90%,表明该判定依据是一种有效且准确率较高的鉴别地沟油的方法。     

氢化物发生原子吸收光谱法测定蛋制品中无机砷

采用氢化物原子吸收光谱法测定蛋制品中的无机砷含量,该检测方法线性关系良好,检出限低,样品重复测定6次的相对标准偏差小于5%,加标回收率在90%以上,能满足蛋制品卫生标准中无机砷的检测要求。该方法快速简便,经济实惠。     

Global production sharing and trade in the services of factors

This article develops an approach to measuring the factor content of trade when intermediate inputs are traded, and techniques differ for reasons such as factor price differences. An empirical section documents the importance of intermediates and shows that they mitigate cross-country differences in the factor content of finished goods. The performance of recent models of factor service trade is also evaluated. Existing approaches impute the factor content of imported intermediates with domestic techniques and tend to overstate how well those models perform. The framework developed here can help reconcile general-equilibrium trade models with actual patterns of trade.     

原子荧光光谱法测定稻谷中无机砷含量的不确定度

对原子荧光光谱法测定稻谷中无机砷的测试结果的不确定度进行评定,分析和量化了影响测量结果的不确定度。结果表明,当无机砷含量为0.12 mg/kg时,扩展不确定度为0.0015 mg/kg（k=2）。     

The structure of factor content predictions

The last decade witnessed an explosion of research into the impact of international technology differences on the factor content of trade. Yet the literature has failed to confront two pivotal issues. First, with international technology differences and traded intermediate inputs, there is no existing definition of the factor content of trade that is compatible with Vanek's factor content prediction. We fill this gap. Second, as Helpman and Krugman (1985) showed, many models beyond Heckscher-Ohlin imply the Vanek prediction. Thus, absent a complete list of these models, we do not fully know what models are being tested when the Vanek prediction is tested. We completely characterize the class of models being tested by providing a familiar consumption similarity condition that is necessary and sufficient for a robust Vanek prediction. Finally, we reassess the performance of the prediction using the correct factor content definition and input-output tables for 41 countries. We find that the prediction performs well except for the presence of missing trade. Further, missing trade is not pervasive: it is associated entirely with ‘home bias’ in the consumption of agricultural goods, government services and construction.     

湿法消解-石墨炉原子吸收光谱法测定玉米油中的铅

本文采用湿法消解石墨炉原子吸收光谱法测定玉米油中铅含量。玉米油样品以硝酸-高氯酸混合体系为消解液,浸泡5 h,再结合石墨炉原子吸收光谱法,分别从灰化温度、原子化温度和基改机选择方面进行条件的优化,从而建立合适的上机方法。其平均相对相差小于1.0%,加标回收率为95.0%~102.0%,结果令人满意。     

电感耦合等离子体-原子发射光谱法测定龟苓膏中镉、铬和锌的含量

龟苓膏试样经干法灰化后,采用电感耦合等离子体-原子发射光谱法(ICP-OES)测定其中的镉、铬和锌的含量。方法的加标回收率在93.9%~105.1%,相对标准偏差在0.85%~3.03%,具有良好的准确度和精密度。因此,该方法可用于龟苓膏中重金属含量检测和控制。     

Evaluating Facebook brand content popularity for service versus goods offerings

Marketers using social media are struggling with its successful implementation, specifically in engaging their audiences through creation of popular brand content. Yet, creating popular brand content can lead to positive financial and brand outcomes. This research examines Fortune 500 companies' brand content strategies that contribute to Facebook content popularity metrics (i.e., number of likes and comments) for service versus goods offerings. Building on psychological motivation theory and the noted differences in culture and capabilities between goods and service firms, the article analyzes the key differences in service and goods brand content strategies in terms of branding, message appeals, and vividness. The findings from a multivariate multilevel Poisson model show that the use of corporate brand names is more popular for service messages whereas the use of product brand names, images, and videos is more popular for goods messages. Furthermore, service messages generate a higher number of comments than goods messages.     

Ethical Beliefs and Management Behaviour: A Cross-Cultural Comparison

A cross-cultural empirical study is reported in this article which looks at ethical beliefs and behaviours among French and German managers, and compares this with previous studies of U.S. and Israeli managers using a similar questionnaire. Comparisons are made between what managers say they believe, and what they do, between managers and their peers' attitudes and behaviours, and between perceived top management attitudes and the existence of company policy. In the latter, significant differences are found by national ownership of the company rather than the country in which it is situated. Significant differences are found, for both individual managers by nationality, and for companies by nationality of parents, in the area of organizational loyalty. The attitude towards accepting gifts and favours in exchange for preferential treatment, as a measure of societal values, is also found to show significant differences between national groups. However, no significant differences are found for measures for group loyalty, conflict between organizational and group loyalty and for conflicts between self and group/organization. The findings have implications for cross-border management decision strategies regarding such issues as receiving and giving of gifts, and the management of relations between local employees and international organizations which may be affected by differences in attitude to corporate loyalty.