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对电弧引燃炉法测定金属材料中的硫含量进行了理论分析和实验探索,讨论了氧气流量、添加剂等的影响,提出了获得稳定测定结果的方法. 相似文献
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着重介绍汽柴油的质量不断提高的朝低硫清洁燃料标准过渡过程中快速置换的方法与质量控制。 相似文献
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介绍了国内外裂解碳五馏分分离技术的研究进展。对几种生产工艺的技术特点进行了分析,着重叙述了加热二聚法分离环戊二烯、萃取精馏法分离异戊二烯等工艺。提出优化现有工艺、开发新型萃取剂是今后碳五馏分分离技术发展的新方向。 相似文献
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在石油化工生产过程中,硫含量的测定是需要严格控制的一项重要指标,也是与发动机的腐蚀及环保排放有关的重要项目。硫的存在还降低了油品的氧气安定性,使油品颜色变深,产生特殊的气味和讨厌的沉渣而降低油品的质量。炼厂及石油化工装置排放气中的硫化氢、二氧化硫,在空气中还会形成酸雨,污染环境, 相似文献
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根据Lall(拉尔)贸易产品技术分类体系,从产品技术含量和附加值分布的角度,对浙江省1999年~2010年出口贸易技术结构进行了分类研究,证明,该阶段.浙江省出口贸易技术结构整体上呈现不断优化的趋势,但存在不合理现象,进一步优化技术贸易结构势在必行. 相似文献
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数字内容产业的内涵、界定及其国际比较 总被引:4,自引:0,他引:4
不久以前,国家《文化产业振兴规划》明确提出要加快发展我国数字内容产业。本文详细介绍了信息产品、内容产品、数字产品与数字内容产品之间的相互联系和区别,指出以往资料文献对相关定义的模糊和混用,全面比较、归纳和总结了国内外有关数字内容产品和服务的概念内涵,明确界定出数字内容产业的对象和范围,进而得出促进数字内容产业快速发展以振兴和繁荣我国文化产业的政策建议。 相似文献
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The doctor of business administration (DBA) degree is widely considered as a professional doctorate or professional doctoral degree that is designed to prepare business practitioners. The doctor of philosophy (PhD) in business, by contrast, is thought to prepare research scholars and higher education faculty members. Prior research conducted by the authors comparing the curriculum of DBA and PhD programs, analyzing accreditation and regulation of the degree programs and examining the terminal degrees of business faculty, did not support the theoretical difference between the two degrees. This study consisted of an analysis of 147 DBA versus 151 PhD dissertations. The analysis indicated a significant group mean difference in the number of PhD versus DBA dissertations in institutions with an R1 classification by the Carnegie Commission on Higher Education. However, no significant correlations nor group mean differences were found in methodology choice, sample size, or research type (applied vs. basic), based on the degree type (DBA vs. PhD). 相似文献
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《Journal of Global Marketing》2013,26(2):31-50
A large percentage of U.S. manufacturers are either refraining from exporting or are involved in inefficient methods of exporting because they may not understand how to control their export operations. The authors of this study suggest how the majority of U.S. manufacturers may effectively participate in exporting through intermediary usage by building the correct degree and type of control mechanisms. Literature derived from transaction cost analysis and export stages are used to link the antecedents of control to the degree and the type of control mechanisms (monitoring and providing information). The results show that manufacturers periodically monitor their intermediaries and provide information in order to achieve control. Important implications are drawn for both exporters and nonexporters. 相似文献
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针对芝麻调和油中纯芝麻油含量检测问题,介绍气相色谱法、FTIR-ATR法、GC-MS法、浓硫酸显色法、波多因法等检测芝麻油含量的方法,并分析我国芝麻油生产现状。 相似文献
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采用GB/T5009.34-2003《食品中亚硫酸盐的测定》盐酸副玫瑰苯胺法对腐竹中二氧化硫含量进行测定,讨论该检测方法的注意事项。结果表明:福建闽侯腐竹中二氧化硫含量相对稳定,检测结果均在规定范围内;盐酸副玫瑰苯胺溶液中盐酸(1∶1)用量为10~15 m L;二氧化硫标准溶液避光低温保存一个月后须重新标定;控制显色时间20 min,显色温度25℃。 相似文献
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淀粉和变性淀粉常常被肉制品当作增稠剂,加入之后可以提高肉制品的持水性、组织形态。但肉制品中淀粉的含量是需要控制的,只有控制好肉制品中淀粉的含量,加强对产品的监督和管理,才能保证肉制品的质量。本文阐述了淀粉的概念和检测肉制品中淀粉含量的几个方法,通过实验对测定方法进行了对比。 相似文献