试论带传感器温度变送器测量值不确定度分析及评定

在工业生产的过程当中,会产生多种液体、蒸汽和气体,为了实现对工业生产质量的有效控制,对这类产物的温度进行实时测量是控制生产空间温度的重要手段。在实际针对各种不确定的因素进行分析过程中,可将《温度变送器校准规范》(JJF1183-2007)作为主要依据,并且在确定影响因素的基础上实现对科学措施与方式的有效制定。     

压力传感器输出电流测量结果的不确定度评定

参照JJG882-2004《压力变送器检定规程》、JJG875-2005《数字压力计检定规程》等对压力传感器进行校准,按照JJF1059.1-2012《测量不确定度评定与表示》要求,对压力传感器的测量结果进行了不确定度的评定。     

变送器应用中存在的故障分析

随着工业过程自动化程度的不断提高,变送器作为自动控制系统中的一个重要组成部分,被广泛应用于温度、压力、液位、流量、成分等测量中。变送器种类较多,有重庆川仪的EJA系列、罗斯蒙特的1151、3051系列、ABB的600T、2600系列。这些变送器都带有HART通讯协议,HART,即高速可寻址远程变送协议(Highway Addressable Remote Transducer)。这些变送器对温度、压力、液位、流量等物理量进行测量,并转换成统一的4—20mA标准信号,能够为生产工艺提供更好的准确度、长期稳定性和可靠性。本文主要针对变送器在进行压力、液位、流量测量时常见的几种故障进行简单分析。     

压力计量测试技术的发展方向和现场压力校准分析

压力计量测试技术作为表达各种工艺流程优劣和先进程度的重要标志,在工业生产和科研方面有着非常重要的作用.本文主要分析和研究压力计量测试技术的相关问题和发展方向以及现场压力校准.     

湿式气体流量计的比对应用

随着电子产品和计算机在其领域日新月异的发展,标定煤气表的检测设备也取得了实质性的进步,其中80%以上为音速喷嘴自动检测装置来完成检测。但是音速喷嘴气体流量标准装置由温度变送器采集温度信号,压力变送器采集压力信号,晶体振荡器采集时间信号等,所有这些采集器每年检定校准一次,     

如何提高利用压力变送器测量密度变化介质容器的液位值

利用压力变送器测量液位是工业自动化测量中最常见的一种测量方式,对于介质密度不变的情况下测量值较为准确,但如果测量介质的密度是随时变化的,由于压力变送器中的量程设置并不能随着介质密度变化的随时进行更改,所以测量得到的液位值与实际值存在较大的误差,对整个工业控制造成影响。本文结合工作实际,对于如何修正压力变送器测量的液位值,提高测量的精度进行的分析。     

JJG59-2007活塞式压力计规程解读

活塞式压力计是利用流体静力平衡原理进行压力测量的计量器具,其性能稳定,复现性好,主要由计量技术机构作为压力计量标准用于量值传递,部分计量站/所用于直接测量压力值,也有厂矿计量部门用于检测压力表、数字压力计或压力传感器/变送器等。     

压力表校准技术的应用

作为用于压力测量的压力仪表,由于其实际应用的特殊性,不仅受到了法律条例和政府管理部门的监督限定,也受到了企业自身的管理限定。压力仪表必须进行定期的压力计量校准,并通过压力校准数据保存记录,来证实压力仪表的性能和运行能力,     

ST3000智能变送器在应用中的故障诊断与分析

压力参数与流量参数在锅炉与发电机组的运行调节中起到非常重要的作用,而为了控制好包括给水压力、给水流量、送风流量、蒸汽的压力流量、炉膛负压等内容,要求仪表保持较高的灵敏度和准确度。ST3000系列智能变送器是美国霍尼成尔公司研制的产品,由于其性能可靠,现已广泛应用于工业的各个领域。梅山热电厂的很多测量压力流量的变送器都是采用ST3000智能变送器。了解和掌握ST3000智能变送器的原理和故障处理对策对热工仪表检修人员来说是很重要的。     

ST3000智能变送器在应用中的故障诊断与分析

压力参数与流量参数在锅炉与发电机组的运行调节中起到非常重要的作用,而为了控制好包括给水压力、给水流量、送风流量、蒸汽的压力流量、炉膛负压等内容,要求仪表保持较高的灵敏度和准确度.ST3000系列智能变送器是美国霍尼成尔公司研制的产品,由于其性能可靠,现已广泛应用于工业的各个领域.梅山热电厂的很多测量压力流量的变送器都是采用ST3000智能变送器.了解和掌握ST3000智能变送器的原理和故障处理对策对热工仪表检修人员来说是很重要的.     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.