无卤阻燃聚丙烯腈的合成及性能分析

基于环保要求设计合成了无卤阻燃丙烯腈共聚物。热分析表明,醋酸乙烯酯的引入使丙烯腈共聚物的热分解温度有所改变,合适的VAC含量可以使丙烯腈共聚物具有更好的热稳定性。阻燃性能测试表明当丙烯腈共聚物中醋酸乙烯酯单元含量为25%时,由其水解衍生物所制备的阻燃丙烯腈共聚物的极限氧指数值都能达26%以上。     

The impact of environmental management systems on financial performance in fashion and textiles industries

With rising environmental concerns from consumers and stakeholder groups, environmental management has become an important responsibility for today's fashion and textiles manufacturers. The production of fashion and textiles related products often requires high levels of energy and water consumption, and emits large quantities of pollutants to the environment. Therefore, the adoption of environmental management systems (EMSs) is important and could have a significant impact on these firms' operational performance. This study presents empirical evidence on the performance impact of EMS adoption in the fashion and textiles related industries (FTIs). Although EMSs have emerged as a passport to business in the FTIs, their actual impacts on firms' financial performance have not been explored. We reveal that the adoption of ISO 14000, the most popular EMS, improves manufacturers' profitability in the FTIs over a three-year period as measured by return-on-assets (ROA). Based on our sample, we find that profitability improvement started during the implementation stage and continued at least one year after the firm obtained ISO 14000 certification. We also find that profitability improvement is mainly due to improvement in cost efficiency, measured by return-on-sales (ROS). Specifically, certified firms improved up to 2.9% in ROA and 3.3% in ROS over the three-year period since they implemented ISO 14000. We conclude that there is a positive impact of EMS adoption on firms' financial performance in the FTIs.     

The impact of supplier development on buyer competitive advantage: A path analytic model

As manufacturing firms increasingly realize that supplier performance is crucial to their establishing and maintaining competitive advantage, supplier development has been a subject of considerable research in supply chain management. We develop and test a path model to explore how supplier development practices affect buyer-supplier performance from the buying firm's perspective in the context of Hong Kong's electronics industry. The results show that top management, supplier evaluation, and supplier strategic objectives are significant determinants of transaction-specific supplier development, and that buyers that have closer collaborative relationships with suppliers may strengthen their competitive advantage.     

Two-machine flow shop scheduling with deteriorating jobs and chain precedence constraints

In this paper we investigate two-machine flow shop scheduling problems with deteriorating jobs and chain precedence constraints. We consider two types of precedence constraints. Under the first type constraints, a successor cannot start on any machine before its predecessor has been completed on the same machine. Under the second one, a successor cannot start on any machine before its predecessor has been completed on all machines. We show that the problem with the first type precedence constraints is polynomially solvable, and the problem with the second type precedence constraints is NP-hard in the strong sense.     

价值工程在工业企业低碳生产中的应用研究

本文以工业企业为研究对象,分析了工业企业低碳生产的现状,发现了工业企业能源消耗量大、低碳减排潜力巨大的特点。在价值工程和低碳经济的研究基础上,给出了价值工程的扩展公式,并将此扩展公式运用到工业企业的低碳生产之中,为工业企业降低碳排放,发展低碳生产提供了有效途径。     

公司治理对公允价值相关性的影响研究

公允价值计量是我国会计准则的核心内容,也是与国际会计准则趋同的一个重要标志,但其是否提高了会计信息的价值相关性,公司治理又如何影响其价值相关性,是我国会计改革与公司治理亟待研究的重要问题.本文以我国上市公司2007～2009年数据为样本,研究了公允价值的价值相关性以及公司治理对公允价值相关性的影响.研究结果表明,公允价值信息增强了会计信息的解释能力,提高了会计信息的价值相关性;公司治理对公允价值相关性具有显著的正向作用,并且相较于可供出售金融资产,其对交易性金融资产的作用效果更强,公司治理是提高公允价值相关性的一条可靠途径.     

我国大中型煤炭企业技术创新效率实证研究

本文采用DEA模型,在投入指标中加入技术因素,测算了1996 ～ 2008年我国大中型煤炭企业的技术创新效率,并且对2009年、2010年的各项科技投入要素做了详尽的分析.结果表明只有1996年、1997年、2003年、2008年4个年度达到DEA有效,平均效率为0.83,低于平均值的年度占50％以上,整体来说科技资源的投入产出效率不高,有待提高.本文进一步将整个时间段分为1996～2002年与2003 ～2008年2个时间段,经比较,综合效率平均上升了8.65％,纯技术效率平均下降了4.52％,规模效率平均上升了13.32％,但规模收益由递增变为递减,所以在增加各项科技要素投入时更要注重资源的有效配置.文章最后给出了提高技术创新效率的建议.     

Imagination Difficulty and New Product Evaluation

This research examines the role of imagination difficulty on the evaluation of really new products (RNPs) in comparison with incrementally new products (INPs). We extend past research on accessibility utilizing an anticipatory approach where consumers look forward and generate mental images for future product usage. We found that the role of imagination changes based on the newness of the product. Specifically, for RNPs, imagination difficulty is perceived to be diagnostic in product assessment, and thus, higher imagination difficulty leads to lower product evaluations. However, for INPs, which are shown to be less susceptible to context effects, imagination difficulty has a limited impact on product evaluations. In addition, we show that the effect of imagination difficulty on the evaluation of RNPs is moderated by the level of involvement of the consumer. Research and managerial implications are discussed.     

The role of a firm's strategic orientation dimensions in determining market orientation

Little is known about how various strategic orientation dimensions determine market orientation. The authors identify four key dimensions of a firm's strategic orientation as critical antecedents to market orientation: the firm's aggressiveness, its future orientation, the extent of marketing formalization, and risk proclivity. Moderating effects of two environmental forces, competitive intensity and technology turbulence, are also considered in light of their relationship with various dimensions of strategic orientation and market orientation. Using a survey with firms spanning multiple industries, the proposed effects are tested with latent class analysis with multiple regimes. The results, based on an optimal two-regime solution, show that that although market orientation is significantly impacted by these strategic orientation dimensions, the pattern of influence differs based on a firm's membership in one of two regimes.     

大型焊接工程结构施工过程中的焊接质量控制

阐述了大型工程结构现场施工过程中焊接质量控制的基本内容和方法,针对焊接过程中不同阶段的质量控制事项进行相应描述与分析,并就相关问题提出相应的处理措施,为大型焊接工程结构焊接质量的控制提供了一定的方法。