色谱法测定粗甲醇纯度方法研究

粗甲醇的纯度测定是保证粗甲醇的制备质量得到合理控制的关键,文章首先对粗甲醇纯度测定方法的基本状况进行了总结,并对粗甲醇具体的纯度测定方案进行了制定,对保证粗甲醇的纯度得到合理控制,进而提升粗甲醇的制备质量,具有十分重要的意义。     

石油苯纯度测定方法的研究

测定石油苯纯度常用方法为ASTMD4492气相色谱法分析苯的纯度标准实验方法,文章分别采用内标法、面积归一法对石油苯纯度分析方法做了研究。面积归一法用量少,操作简单,结果精确度低;内标法为准确定量,操作步骤多,需要加入内标物,结果较精确;两种方法均能满足分析重复性;当苯纯度高时,两种方法结果差别小。     

酸性高锰酸盐指数测定影响因素的研究

分别就高锰酸钾标准溶液的浓度、反应体系的酸度、加热时间、反应温度、滴定速度对测定结果的影响进行了分析,总结了在测定过程中的几点注意事项,对高锰酸盐指数的准确测定具有重要作用。     

2,4,6-三甲基苯甲酸的合成研究进展

2,4,6-三甲基苯甲酸是一种重要的精细化工产品,具有较好的潜在开发价值。文章对2,4,6-三甲基苯甲酸的合成方法进行了综述,对各合成方法的可行性进行了对比分析,并对2,4,6-三甲基苯甲酸的合成工艺开发给出了建议。     

催化加氢制备对氨基苯酚提高纯度的研究

采用高压釜式反应器,以乙醇-水为溶剂,在压力0.2～2.5MPa、反应温度50～120℃、氢气气氛下,探究了Pd/C催化剂对对硝基苯酚催化加氢制备对氨基苯酚的产品纯度影响。结果表明:Pd/C催化剂具有良好的加氢制备对氨基苯酚反应性能,产品纯度随Pd负载量的增加呈现先增加后减小的趋势,Pd负载量为3%时产品纯度可达98.76%;实验探究出对硝基苯酚催化加氢制备对氨基苯酚最佳反应条件:当乙醇和去离子水之比为5:1,催化剂Pd负载量为3%,氢气压力为0.5MPa,反应温度为85℃时,催化剂负荷量为1/60～1/40,对氨基苯酚收率达98.5%,纯度达99%以上。     

电化学分析法在测定水总硬度中的应用

硬度是检测水质中一项极为重要的内容,与以往应用的人工滴定法相比,电化学分析法能够有效减少人工操作中存在的误差,提高测定结果的准确性。文章以电化学分析法为主要研究对象,在对监测水质总硬度的重要性进行研究之后,着重介绍了应用电化学分析法测定水中总硬度的实验过程,并依据实验结果来对比人工和电化学分析法两种方法的优劣性。     

浅析再接触罐的操作对预加氢氢纯度的影响

从2013年11月份到2014年6月份,重整装置再接触罐操作一直不稳定,给装置的平稳操作及生产造成一定的影响.根据再接触工艺特点,针对再接触罐的操作造成装置压力波动的主要因素做简单分析.再接触罐的压力、温度及液面等操作参数的变化对预加氢氢纯度产生影响,通过数据分析,提出优化操作方向,进一步提高预加氢氢纯度,使装置长周期、高效益运行.     

毛细管电泳法手性拆分苯磺酸氨氯地平及其光学纯度分析

采用毛细管电泳法拆分苯磺酸氨氯地平手性对映体并检测其光学纯度,选择CM-β-CD为手性选择剂,考察了CM-β-CD浓度和缓冲液pH值对手性分离的影响,并对分离条件进行了优化。实验结果表明,在不添加任何有机改性剂的条件下,含10 mmol/L CM-β-CD的50 mmol/Ltris-磷酸缓冲液(pH值为2.5)可使对映体在短时间(7.22 min)内完成基线分离,分离度(RS)达4.3。     

合成苯甲酸的新工艺

苯甲酸在食品工业、染料工业、医药及化学分析上都具有广泛的应用，合成苯甲酸常用氧化法和相转移催化氧化法，在工业上通常用甲苯氧化法制取苯甲酸。现以氧化苄为原料，高锰酸钾作氧化剂，选用相转移催化剂CTAB来合成苯甲酸，产率达98％。     

滴定法测定棒酸发酵液中甘油含量

为了消除发酵液中还原糖的影响,建立了高碘酸钠滴定法测定棒酸发酵液中甘油含量的方法,该方法的回收率为98.5%,RSD值为1.69%。本法操作简便,成本低廉,适用于发酵液中甘油含量的测定。     

Development of maintenance function performance measurement framework and indicators

The performance and competitiveness of manufacturing companies is dependent on the reliability, availability and productivity of their production facilities. To ensure the plant achieves the desired performance, maintenance managers need a good track of performance on maintenance process and maintenance results. This can be attained through development and implementation of a rigorously defined performance measurement framework and indicators that are able to measure important elements of maintenance function performance. The purpose of this paper is to demonstrate that performance indicators are not defined in isolation, but should be the result of a careful analysis of the interaction of the maintenance function with other organisational functions, most evidently with the production function. In this paper, a conceptual framework that provide guidelines for choosing maintenance function performance indicators is proposed. It seeks to align maintenance objectives with manufacturing and corporate objectives, and provides a link between the maintenance objectives, maintenance process/efforts and maintenance results. Based on this conceptual framework, performance indicators of the maintenance process and maintenance results are identified for each category.     

A measurement model of strategic planning

While strategic planning is a key concept in management research, there has been little consistency in its conceptualization or measurement. Our review of prior studies also identifies reliability and validity, dimensionality, crude levels of measurement, and lack of parsimony as additional problems associated with prior use of this variable. Such problems substantially limit our ability to compare results across studies, or to make appropriate normative recommendations. We address these concerns by developing and validating a multiple indicator measure of strategic planning, using two independent samples. Implications for future research are then discussed. © 1998 John Wiley & Sons, Ltd.     

Reviewing and improving performance measurement systems: An action research

Reviewing and updating performance measurement systems (PMS) based on internal and external environmental changes are as important as developing and implementing them. The results of an action research study carried out to improve the PMS of an energy company's maritime transportation area are presented. The findings of this longitudinal study illustrate the difficulty and complexity of reviewing and updating an energy company's PMS for its maritime transportation area. This difficulty is due to the involvement of PMS users, the assessment of performance measures, the establishment of targets, and data availability. The complexity is related to the changes in information technology when implementing changes in procedures for computing performance measures. This article contributes to a better understanding of the process of reviewing and updating a company's existing PMS.     

21世纪计量技术的新发展

创新和节约能源与计量有着极其密切的关系。阐述了计量技术的基本单位及相互转换方式,介绍了实物计量基准的局限性和量子计量基准的重要性以及计量标准在国际上的发展趋势。     

乙醛酸合成对羟基苯乙酸的研究

研究了由乙醛酸和苯酚合成对羟基扁桃酸钠后,再经亚磷酸还原,合成对羟基苯乙酸的工艺。研究结果表明:在合适的工艺条件下,由乙醛酸到对羟基苯乙酸的摩尔收率达60.1%。对羟基苯乙酸的质量分数可以达到99%。该法原料来源广,产品质量好,具有较好的发展前景。     

A model for R&D performance measurement

R&D activities are increasingly costly and risky and, as a consequence, measuring their performance and contribution to value becomes critical. This paper illustrates a formal model for measuring R&D performance, based upon a balanced and synthetic evaluation of quantitative indicators from five different perspectives of performance: financial, customer, innovation and learning, internal business, alliances, and networks. The model is built in coherence with the suggestions coming from the theory of measurement in soft systems, which gives relevant guidelines for ensuring validity, objectivity and inter-subjectivity of the model. Then, an application in a real R&D setting is described, which helps to understand the model and to enlighten its main advantages and limits.     

Uncovering the links between regulation and performance measurement

The aim of the research was to explore and evaluate previous work focusing on the relationship and links between regulation and performance measurement. The objectives were to seek out examples in the literature on the unintended consequences of performance measurement and regulation. Several explanatory frameworks are developed and discussed. It is intended that the frameworks can be developed and used: (a) to assist our conceptual understanding of the unintended consequences of regulation and performance measurement at the firm level; (b) to guide regulators in policy making by showing the issues and opportunities that exist as a result of regulation and performance measurement; and (c) to serve as a platform to identify and recommend areas for future research.     

On the design of performance measurement plans in the telecommunications industry

This paper analyzes the design of performance measurement and remedy plans that have been implemented in the telecommunications industry to ensure competitive local exchange carriers are afforded a meaningful opportunity to compete in the provision of local exchange services. It demonstrates that the plans can impose penalties on incumbent local exchange carriers even when the incumbents provide the same or higher level of wholesale service quality to their competitors than they provide to themselves. Simulations are employed to illustrate the magnitude of these penalties.     

一种简单数字测温电路的设计

针对生产试验中低成本、高精度的需要,利用8位A/D转换芯片TLC549、单片机AT89C2051、放大器AD626和数码驱动芯片74HC595设计测温电路。电路中利用对桥电阻的合理选择改善桥的线性关系。理论分析和实际电路测试结果表明,该电路具有精度高、可靠性高、使用方便等优点。