Analysing metals in bottle‐grade poly(ethylene terephthalate) by X‐ray fluorescence spectrometry

After a rigorous cleaning process, recycled food‐grade poly(ethylene terephthalate) (PET), can be mixed with virgin PET resin in different concentrations and used for packaging of soft drinks. Therefore, it is important to have an experimental method to distinguish the presence of recycled polymer in a batch and to check its “true quality.” One of the issues to be verified is the presence of inorganic contaminants due to the recycling process. X‐ray fluorescence technique is one alternative for this kind of analysis. The results obtained in this work show that bottle‐grade PET samples (PET‐btg) are made either via direct esterification or by a transesterification process. Samples that were subjected to thermo‐mechanical processings (superclean® processing, PET‐btg blends processed in our laboratory and soft drink PET packaging) present Fe Kα emission lines with higher intensities than those presented by virgin bottle‐grade PET. After applying principal component analysis, it can be concluded that Fe is an intrinsic contaminant after the recycling process, furnishing a way to indicate class separations of PET‐btg. A calibration and validation partial least squares model was constructed to predict the weight percent of post‐consumption bottle‐grade PET in commercial PET samples. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

基于项目式课程改革的探索

高职教育在国家政策支持下,迅猛发展。从硬件环境和软件教学实力等众多方面都有所提高。取得了可喜的成绩。但是对于发展中存在的问题也不能避而不谈。高职发展时间周期短,很多方面还存在着不足。高职培养的人才是高素质技能型的人才。所以在课程体系上,要不同于以往的大专和高等院校的传统教学模式。要敢于创新,采用适合高职学生的具有时代特性的教学模式。基于项目式的课程改革是解决这一问题的有效手段。本文就项目式课程改革的作用、意义和具体改革措施进行了详细的阐述。     

某大型有色冶炼厂建筑物评估值的确定方法

为科学合理估算工程造价以确定重置成本，从而保证评估结果的客观、可靠，结合某大型有色冶炼厂的实际情况对估算工程造价的几种方法进行了分析，并对所采用的重置成本法作了具体介绍。     

航运物流企业数字化转型设计与效果分析

近年来航运业数字化的加速,凸显出传统航运物流企业日常运营中存在的服务匹配与结算缺乏自动化、业务数据因缺乏透明度而不作为可信证据采信等问题。区块链具有的透明化与可信等特点可以结合物联网与数字货币等技术帮助航运物流企业以数字化转型针对性地解决问题。因此,通过分析合理转型路径,设计基于“蚁群-智能合约”算法作航运服务自动化匹配、基于区块链与物联网提供运输进程可靠追踪服务及基于数字货币实现海运运费高效结算。以太坊测试链上的模拟结果表明了转型方案的有效性,其对内降低运营与结算成本、对外增强业务信息透明度与可信度的价值,提高了航运物流企业的竞争力。     

未来的企业战略选择

针对未来的挑战,论述了经济全球化、信息网络化和高科技的发展,提出了国内企业战略选择的三项对策及适应市场变化的企业内部改革举措。     

Supercritical water for environmental technologies

OVERVIEW: Supercritical water is a great medium in which to perform chemical reactions and to develop processes. Due to its unique thermo‐physico‐chemical properties, supercritical water is able to play the role of solvent of organic compounds and/or to react with them. These specific properties have been used since the 1990s to develop new technologies dedicated to the environment and energy. IMPACT: Supercritical water based technologies are innovative and efficient processes having a strong impact on society, the environment and the economy, and is termed a sustainable technology. APPLICATIONS: Three main applications for supercritical water technology are under development: (i) supercritical water oxidation (SCWO); (ii) supercritical water biomass gasification (SCBG); and (iii) hydrolysis of polymers in supercritical water (HPSCW) for composites/plastics recycling. In this paper some fundamentals of supercritical water are first presented to introduce the above three major developments. Then these technologies are reviewed in terms of their present and future industrial development and their impact on the environment and on energy production. Copyright © 2010 Society of Chemical Industry     

污水处理剂的综合评选实验研究

通过对江汉油田含油污水所进行的水处理剂综合评选实验,评选出了聚丙烯酰胺等3种絮凝剂、1种助絮凝剂、4种防垢缓蚀剂和2种杀菌剂以及较佳的净水条件,同时还得出了各种处理剂的加入顺序,经用综合评选出来的配方处理含油污水,其除油率达到100%,除铁率达到97.4%,除机械杂质达到97%,且溶解氧(DO),硫酸盐还原菌(SRB)、腐生菌(TGB)和结垢率均达到了部颁《注入水水质标准》,实验研究还为清污混注提供了有用的数据,证明各药剂配伍性很好。     

SOA在敏捷企业IT建设中的应用

敏捷企业以其快速的市场反应能力和企业间良好的合作关系而受到企业界的追捧,在瞬息万变的市场竞争中如何能够捕捉到转瞬即逝市场机会则是敏捷企业生存之道。加速信息采集、传递,提高企业群之间的快速配合程度,才能够更快的对市场做出反应。在敏捷企业实施SOA能够很好的将虚拟企业关系灵活化,增强敏捷能力。     

数字油田要素分析、建设现状及发展展望

根据国内外大量的文献调研和胜利“数字油田”实际情况，系统阐述了数字油田的基本含义和总体框架，全面总结了数字油田的基本特征、建设内容及主要技术。通过我国数字油田建设的基本现状分析，指出了数字油田的发展前景和必须注意的问题，对我国数字油田的建设有一定的参考价值。     

基于国密算法和PUF的企业用户身份认证系统

针对当前企业信息系统登录方法安全性和可扩展性的不足,设计一种基于国密算法和PUF（物理不可克隆函数）的企业用户身份认证系统。该系统借鉴FIDO U2F（线上快速第二因子身份认证）认证框架,以身份识别令牌作为认证第二因子,使用国产加密算法实现安全性的自主可控,同时在身份令牌中集成了PUF和真随机数发生器,以达到提升安全性和可扩展性的目的。安全性分析表明,该系统的安全性显著高于现有技术实现。实验测试结果表明,该系统运行开销较低,稳定可靠,能够方便、快捷地部署在企业信息系统中。