如何提高水质监测中常用玻璃量器的准确度

玻璃量器测量结果的准确度很大程度取决于其测量不确定度的大小，本文通过对常用玻璃量器检定结果的测量不确定度进行分析，并对如何提高玻璃量器的测量准确度进行了分析探讨。     

油流量计量器具量值传递的探讨

一、概况 油流量计量器具在石油、化工行业的应用极为普遍,油流量计量器具的量值传递直接关系到相关企业的安全生产与经济效益。当前通用的量值传递方法是,工作用油流量计用标准流量计、标准体积管、三等标准金属量器作计量标准器来检定,标准体积管和三等标准金属量器用二等或一等标准金属量器来检定。油流量计包括容积式流量计和推理式流量计。 《计量法》规定“计量检定必须按照国家计量检定系统表进行”。按照国家现行的计量检定系统表,     

常用玻璃量器容量测量结果的不确定度评定

本文主要讨论了用玻璃量器检定装置检定玻璃量器时影响检定结果的误差来源,并结合实际工作分析了主要影响因素及其不确定度的评定。给出了检定结果不确定度的计算方法。     

玻璃量器容量的测量结果不确定度分析

本文主要讨论了用玻璃量器检定装置玻璃量器时检定结果的误差来源，并结合实际工作分析了主要影响因素及其不确定度的评定。给出了检定结果不确定度的计算方法。     

水利部对玻璃量器计量检定人员考核发证

为更好地贯彻《计量法》,根据国家技术监督局《计量检定人员管理办法》,针对水利行业计量器具或装置检定的需要,水利部委托黄河流域水环境监测中心于1993年4月举办了两期玻璃量器计量检定人员考核学     

三等金属量器容量衡量法检定装置

三等金属量器作为一种常用的容量计量器具,越来越多地应用到地方计量技术机构、石油石化、油库、加油站的油品计量部门及科研和企业生产环节中。通过"容量衡量法"检定系统实现对三等金属量器的检定,此方法具有检定过程简单,操作方便,准确度高,重复性好等优点。     

标准玻璃量器在容量检定中应注意的几点

标准玻璃量器 (以下简称标准球 )作为常用玻璃量器量值溯源的标准之一 ,其规程规定检定周期为3年。由于工作量较少 ,长期不操作 ,作为检定人员对标准球在容量检定时正负号的读取难免会有些生疏 ,笔者在长期的工作实践中总结出以下几点 ,与同行共勉。这里我们主要谈谈以电光分析天平为标准对标准球进行容量检定时应注意的几个方面。1　平衡位置ＬＡ、ＬＢ的读取通常在检定时 ,作为调整天平平衡的辅助砝码放在天平的左盘 ,右盘放称量杯和与被检标准球容量相当的标准砝码。当天平达到平衡时 ,观察光标停在零位的左边还是右边 ,当光标停在零位的…     

浅谈数字压力计标准装置期间核查

近年来油田各级计量检定机构多采用数字压力计标准装置进行压力量值传递。数字压力计标准装置,会由于测量元器件老化、人员操作和环境影响等因素,发生示值漂移或稳定性下降,导致检定结果的失准。定期对其进行期间核查,及时发现计量标准装置的变化,实时采取纠正措施,才能确保计量标准测量结果的准确可靠。     

油库质量流量计现场检定测量不确定度评定

使用静态容积法油流量标准装置对油库中用于成品油贸易计量的科里奥利质量流量计进行现场检定,通过分别评定流量计测量重复性、计量温度下的油品体积、体积修正系数和油品计重密度4个分量的相对标准不确定度,合成得到被检流量计相对误差的测量不确定度。根据测量不确定度评定结果可知,该静态容积法油流量标准装置符合国家计量检定系统表和检定规程的相关要求,可以用于油库准确度等级0.2级及以下质量流量计的现场检定。     

水利行业玻璃量器检定员培训班在郑州举办

为进一步规范水利行业汁量枪定工作，确保有关质榆机构汁量认证工作的顺利进行，根据从事计量柃定的人员必须持有效检定员证要求，水利部计量办公室委托黄河流域水资源保护培训中心，于2004年7月12日至7月15日在郑州举办了水利行业玻璃量器定定员培训班。来自6大流域机构以及     

Measures and measurement: Process and practise

Even although case studies remain one of the most widely utilised approaches in the study of industrial markets, debate continues about the apparent lack of any consistency in the way the case study method is applied. While acknowledging the shortcomings, this paper highlights the strengths and celebrates the diversity of the case study approach in developing and testing theory. Seven outstanding cases, selected from the Fourth Meeting of the IMP Group in Asia are presented.     

Global purchasing strategy: Conceptualization and measurement

In this paper we introduce Global Purchasing Strategy (GPS) as an explanatory construct of global purchasing performance. GPS is embedded in a contingent resource-based view. The construct is conceived as the driving force behind the strategy-organization alignment. GPS is conceptualized along four dimensions: the configuration of the global purchasing process, the standardization of the global purchasing process, the standardization of product-related characteristics and the standardization of the purchasing staff organization. We develop the GPS scale and test it on a sample of 151 internationally purchasing firms. The analytic results show evidence of both reliability and validity. We propose a general model of global purchasing performance with GPS as a central mediating construct.     

Just-in-time selling construct: Definition and measurement

Contemporary JIT literature provides evidence that the JIT philosophy has been extended to the selling function. The literature, however, lacks a concise definition of JIT-selling and reliable, valid scales for measuring the construct. A formal definition is proposed and JIT-selling scales are scientifically developed using survey data from manufacturers.     

Multiple channel complexity: Conceptualization and measurement

Nowadays, to better serve their customers, many companies are using multiple channels with different levels of complexity. Although the literature agrees that it is a challenge to design and manage multiple channels for improved performance in today's circumstances, there are no empirically determined guidelines offered to achieve that goal. One contributing factor to this is the lack of a clear conceptualization of multiple channel complexity in the literature. With no such construct and measure, researchers are unable to conduct studies to understand variability in the complexity of multiple channels in practice and hence to draw normative conclusions for managers. In this work, drawing upon the vast organizational complexity literature, we provide a conceptual definition and a measure of multiple channel complexity. Our construct describes the structure of a multiple channel system with respect to three complexity dimensions: channel number; channel levels, and channel member variety. The data from 305 sales/marketing managers in the electronics industry support the validity of the construct as we observe that in highly uncertain environments having highly complex multiple channels in place improves company performance.     

化学需氧量测定方法的改进及质量控制

采用美国HACHDR/2500型分光光度计测定水中化学需氧量,操作简单、方便,但在实际应用中还存在着样品检测时间过长、检测准确度不够等一些技术问题,本文从消解温度、消解时间、冷却方法以及空白校零这四个方面对其分析性能进行研究,提出了显著缩短样品检测时间并提高检测准确度的新方法,并对改进前、改进后两种方法的分析质量进行控制,测定结果合理有效,从而证明改进后的新方法能达到快速准确地检测样品的目的。     

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.     

水文计量管理的基础:加强水文计量标准体系建设——《转子式流速仪》《浮子式水位计》《超声波测深仪》等水利行业计量检定规程出台

水文计量管理工作的最基础环节之一就是建立一套完善的水文计量标准体系,而其最重要的组成部分是水利计量检定规程,这是水文计量领域开展计量管理工作的最根本保障.本文重点对JJG(水利)01-2009<转子式流速仪>、JJG(水利)02-2009<浮子式水位计>、JJG(水利)03-2009<超声波测深仪>等三项水利行业计量检...     

浅谈渠道测量

根据老灌区节水改造工程渠道放线测量工作的实践经验，论述了渠道测量过程中的难点及对策；阐述了在放线测量过程中的设计人员与测量人员如何配合的问题。     

Performance measurement in R&D: exploring the interplay between measurement objectives, dimensions of performance and contextual factors

Measuring research and development (R&D) performance has become a fundamental concern for R&D managers and executives in the last decades. As a result, the issue has been extensively debated in innovation and R&D management literature. The paper contributes to this growing body of knowledge, adopting a systemic and contextual perspective to look into the problem of measuring R&D performance. In particular, it explores the interplay between measurement objectives, performance dimensions and contextual factors in the design of a performance measurement system (PMS) for R&D activities. The paper relies on a multiple case study analysis that involved 15 Italian technology-intensive firms. The results indicate that firms measure R&D performance with different purposes, i.e. motivate researchers and engineers, monitor the progress of activities, evaluate the profitability of R&D projects, favour coordination and communication and stimulate organisational learning. These objectives are pursued in clusters, and the importance firms attach to each cluster is influenced by the context (type of R&D, industry belonging, size) in which measurement takes place. Furthermore, a firm's choice to measure R&D performance along a particular perspective (i.e. financial, customer, business processes or innovation and learning) is influenced by the classes of objectives (diagnostic, motivational or interactive) that are given higher priority. The implications of these results for R&D managers and scholars are discussed in the paper.