离心式压缩机干气密封工作原理与典型故障研究

文章首先介绍了离心式压缩机干气密封的工作原理,接着结合当前的离心式压缩机运行原理对离心式压缩机运转过程中发生的典型故障进行了分析,最后总结了离心式压缩机发生故障的原因,并对其原因进行讨论,以此为我国今后的压缩机运行及故障检测维修提供可行性参考。     

离心式压缩机振动故障分析与安全运行

由于离心式压缩机在能源工程中占据重要位置,一旦设备出现故障,将给能源化工工程带来巨大的损失。为保证能源化工行业施工的安全性,需要提升离心式压缩机的可靠性。文章介绍了离心式压缩机的结构、特性与离心式压缩机出现的震动故障,并对离心式压缩机的安全运行提出了合理化的解决措施。     

往复式天然气压缩机故障诊断方法探析

在油气田生产、天然气集输、天然气销售等方面,应用到的重要机械设备之一就是往复式压缩机组。文章从现阶段的往复压缩机诊断技术的研究现状入手,对当前往复式天然气压缩机组最常见的故障因素进行了分析,并提出了若干常见的故障诊断方法,以供机械维修技术人员参考。     

离心压缩机常见故障诊断与排除

文章针对离心式压缩机在启动、加载以及运行过程中经常出现的故障,分析了出现问题的各种原因,并提出了合理的处治措施,以确保压缩机的安全稳定运行。     

离心式压缩机空气过滤器改造分析

文章介绍了离心式压缩机空气过滤器存在的问题及压缩机的工作原理,阐述了自洁式空气过滤器的工作原理及其结构特点,进而对空气过滤器改造的可行性进行分析,并分析离心式压缩机空气过滤器改造后产生的效益。     

离心式压缩机空气过滤器改造分析

文章介绍了离心式压缩机空气过滤器存在的问题及压缩机的工作原理，阐述了自洁式空气过滤器的工作原理及其结构特点，进而对空气过滤器改造的可行性进行分析，并分析离心式压缩机空气过滤器改造后产生的效益。     

离心式压缩机的转速调节探讨

离心式压缩机是一种广泛应用的动力设备。在很多较大的企业生产单位都有应用。例如化工、冶金、机械制造等领域。而本文主要是通过对离心式压缩机转子、回流器的结构进行改良,来提高离心式压缩机的转速,以此来提高工作效率。     

基于有限元分析的离心式压缩机转子系统设计及性能优化

离心式压缩机作为一种用途广泛的能量转换装置,其制冷量大、结构简单、工作可靠、运行平稳以及效率高等特点,在许多行业中都占据了重要的地位。随着行业的不断发展,离心压缩机的输出冷量也越来越大,对离心式压缩机的设计要求也越来越高。转子系统作为离心压缩机的核心组件,对其性能的影响也是最重要的。文章以双级离心式压缩机转子系统为研究对象,在研究双级离心压缩机转子系统的构造、性能及其影响因素的基础上,采用了理论分析、仿真计算、优化设计和实验测试相结合的方法手段,对双级离心式压缩机转子系统进行了优化设计和研究,设计出了中央空调样机,并且通过了相关的测试实验。     

离心压缩机组状态监测故障诊断系统的开发

介绍离心压缩机组状态监测故障系统的总体结构、技术关键点及功能特点。系统以工业控制计算机为中心 ,实时监测机组轴向位置、轴承振动及工艺参数 (电流、功率、温度 )等信号 ,实现预警、紧急自动停车和滚动轴承故障诊断等功能。系统应用于工业现场 ,取得了良好的效果     

往复式压缩机故障诊断方法研究综述

压缩机是将原动机的动力转化成为气体压力能的机器,目前在石油、石化、化工等行业得到广泛应用,是工业生产的重要辅助设备,由于结构复杂、配件易损坏等,在使用过程中发生故障的频率较高。文章从对往复式压缩机故障诊断的现状出发,对其在生产过程中出现的故障及原因进行分析,并提出了相应的诊断方法。     

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.     

Ansätze und Ergebnisse anglo-amerikanischer M&A-Forschung

Based on a review of established U.S. management journals (1995–2003), six schools of thought are identified within the Anglo-American M&;A research: “Capital Market”, “Principal/Agent”, “Industrial Organization”, “Organizational Behavior”, “Human Resources” and “Strategic Management”. The literature review shows that the definition of M&;A success, the methods applied, and insights from empirical research differ according to the respective school of thought. Empirical studies focus on the resource combinations of merger partners, the specific circumstances of merger negotiations, and on integration management as antecedents of merger performance. Unfortunately, empirical findings have not yet provided reliable explanations for M&;A success. Based on the current state of Anglo-American M&;A research, the authors discuss implications for business practice, identify research gaps, and propose areas for future research.     

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.     

Introduction of New Technology with a Sound Transition of the Input-Output Structure

We examine the general equilibrium repercussions associated with the introduction of new technologies, using the generalized Leontief system that allows technological substitutions. We show that an untested introduction of cost-increasing technologies in any industry may result in creating a non-productive technological structure that does not satisfy the Hawkins-Simon condition, following the autonomous dynamic adjustment process with structural transitions in the economic system. Therefore, we propose a practicable control scheme of introducing cost-increasing technologies that strictly avoids the creation of non-productive structures in all periods of structural transition, using the available information on the ex ante technological structure.     

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。