聚乙烯基吡咯烷酮市场现状及生产工艺

本文综述了聚乙烯基吡咯烷酮的市场情况和生产工艺技术,并进行了对比,得到了不同侧重的最佳合成工艺。     

绿色增塑剂柠檬酸三丁酯的生产和应用

介绍了柠檬酸三丁酯的生产方法及用途,对合成柠檬酸三丁酯的各种催化体系进行了综述,提出了今后的发展前景。     

双峰聚乙烯的生产技术及市场前景

介绍双峰聚乙烯的性能特点和用途,阐述双峰聚乙烯的生产工艺、催化剂的研究开发进展以及国内外生产概况,提出了发展我国双峰聚乙烯生产的一些建议.     

乙丙橡胶的生产技术及市场分析

介绍了乙丙橡胶的生产方法,分析了国内外乙丙橡胶的生产消费现状及发展前景,提出了发展中国乙丙橡胶工业的一些建议.     

世界聚丙烯工业生产现状及技术进展

综述了世界聚丙烯工业的供需现状、生产工艺、催化剂和新产品的研究开发进展.多区循环反应器(MZCR)技术和双峰聚丙烯技术将成为聚丙烯的主要生产工艺,Z-N催化剂将不断向系列化、高性能化方向发展,茂金属-单活性中心催化剂(SCC)的应用将进一步得到发展,非茂单活性中心催化剂的开发将成为研究开发的热点,新产品的开发将使其应用范围更加广泛.     

浅析新公司法关于有限责任公司股东退出机制

新公司法的出台对于有限责任公司股东退出问题提供了新的依据,使投资者不仅可“得门而入”,而且可以在一定条件下“全身而退”。有限责任公司的股东,可以通过股权的内部转让、股权的外部转让等约定退出,还可以通过维权之诉等法定退出。     

加氢深度脱氮催化剂载体的研制

本文论述了制备加氢深度脱氮催化剂载体中,不同制备条件对其物化性能的影响.实验证明在一定的搅拌速度下,pH为7～8,温度在60～90℃时,可制备优良的催化剂加氢载体材料.     

影响加氢法生产凡士林质量的因素探讨

本文从原料、工艺条件、催化剂等诸多对加氢法生产凡士林的质量有重要影响的因素进行了探讨分析，并给出几点建议。     

Seeing Is Not Believing: Perceptions of Date Labels over Food and Attributes

ABSTRACT

This study investigates consumers’ perceptions of date labels (“Best by” and “Use by”) between different food items (spaghetti sauce and deli meat) and across different attributes (nutrition, quality, safety, and taste). We collected data from experimental auctions and a survey held in cities located in two different regions of the United States. Previous research suggests that confusion over date labels contributes to waste. Thus, we ask respondents to indicate the meaning of date labels for products over attributes. Overall we find that respondents have differing conceptions of date labels by product and over attributes, which reflects confusion over the date labels. However, the differences, while statistically significant, are not large enough to suggest a reversal of perception from agreement to disagreement in the meaning of the date label for specific attributes. The findings question the effectiveness of a two-date label regime to reduce food waste.     

分子筛在环境友好烷基化生产技术中的应用

介绍了国内外分子筛的研究现状和催化性能,综述了它们在烷基化反应中的应用,包括:苯和乙烯的烷基化;苯和丙烯的烷基化;苯和长链烯烃的烷基化;多环芳烃的择形烷基化;苯酚的烷基化;苯胺的烷基化;脂肪醇的胺化反应.     

The mediating role of integration of safety by activity versus operator between organizational culture and safety climate

ABSTRACT

In this study, we analyse the impact of the organizational culture and introduce a new variable, the integration of safety, which relates to the modalities for the implementation and adoption of safety in the work process, either through the activity or by the operator. One hundred and eighty employees replied to a questionnaire measuring the organizational climate, the safety climate and the integration of safety. We expected that implementation centred on the activity or on the operator would mediate the relationship between the organizational culture and the safety climate. The results support our assumptions. A regression analysis highlights the positive impact on the safety climate of organizational values of the ‘rule’ and ‘support’ type, as well as of integration by the operator and activity. Moreover, integration mediates the relation between these variables. The results suggest to take into account organizational culture and to introduce different implementation modalities to improve the safety climate.