基于人工神经网络模型的加固专用砂浆性能研究

根据影响加固专用砂浆性能的水胶比、粉煤灰与胶凝材料用量比、包裹砂粒的平均浆体厚度3个因素的正交试验数据,文章建立了人工神经网络模型,并计算了不同因素不同水平下砂浆的稠度、密度、抗折强度、抗压强度和黏结强度,讨论了各个因素和砂浆各个材料性能之间的关系,并为加固专用砂浆的配制及性能指标预测提供了计算方法。     

基于人工神经网络模型的加固专用砂浆性能研究

根据影响加固专用砂浆性能的水胶比、粉煤灰与胶凝材料用量比、包裹砂粒的平均浆体厚度3个因素的正交试验数据,文章建立了人工神经网络模型,并计算了不同因素不同水平下砂浆的稠度、密度、抗折强度、抗压强度和黏结强度,讨论了各个因素和砂浆各个材料性能之间的关系,并为加固专用砂浆的配制及性能指标预测提供了计算方法.     

高速铁路客运专线板式无砟轨道Ⅱ型CA砂浆配制技术

文章研究了板式无砟轨道水泥乳化沥青砂浆组成原材料的选用和作用机理,研究了CA砂浆硬化过程及机理,分析了CA砂浆的流动度、含气量等性能影响因素,开发出适合CRTSⅡ型板式无砟轨道施工的CA垫层砂浆,并对其性能进行了对比试验。该CA垫层砂浆具有早期强度高、不泌水、不分层,抗冻融性及耐侯性能优异等特点,适合于现场施工使用。     

高速铁路客运专线板式无砟轨道Ⅱ型CA砂浆配制技术

文章研究了板式无砟轨道水泥乳化沥青砂浆组成原材料的选用和作用机理,研究了CA砂浆硬化过程及机理,分析了CA砂浆的流动度、含气量等性能影响因素,开发出适合CRTSⅡ型板式无砟轨道施工的CA垫层砂浆,并对其性能进行了对比试验.该CA垫层砂浆具有早期强度高、不泌水、不分层,抗冻融性及耐侯性能优异等特点,适合于现场施工使用.     

高速铁路客运专线板式无砟轨道Ⅱ型CA砂浆配制技术

文章研究了板式无砟轨道水泥乳化沥青砂浆组成原材料的选用和作用机理，研究了CA砂浆硬化过程及机理，分析了CA砂浆的流动度、含气量等性能影响因素，开发出适合CRTSⅡ型板式无砟轨道施工的CA垫层砂浆，并对其性能进行了对比试验。该CA垫层砂浆具有早期强度高、不泌水、不分层，抗冻融性及耐侯性能优异等特点，适合于现场施工使用。     

新老混凝土界面抗剪粘结强度试验研究

通过室内新老混凝土面板抗剪粘结强度试验,研究界面抗剪粘结强度与老混凝土粘结面粗糙度及界面粘结剂的关系,掌握了界面抗剪强度变化规律,为混凝土路面修补的实际操作提供了参考依据。     

材料组成对砂浆耐酸性能的试验研究

采用酸性环境下加速试验的方法,研究了材料组成对砂浆耐酸性能的影响。对不同水泥品种、灰砂比和外加剂在各个腐蚀阶段砂浆的质量变化和抗压强度变化进行比较分析。结果表明:在pH=2的酸性环境下,普通硅酸盐水泥砂浆和高抗硫酸硅酸盐水泥砂浆的耐腐蚀能力比快硬硫铝酸盐水泥砂浆强;灰砂比大时,砂浆的耐酸性有所改善;在1年的侵蚀龄期内,掺憎水剂的砂浆相比掺阻锈剂与密实剂的砂浆强度下降率小。     

浅谈砂浆增塑剂的特性及其应用

砂浆增塑剂是通过多种夭然高分子材料化合而成的一种目前最新型的砂浆外加剂,是一种环保型的新型建材产品,可广泛使用于砌筑砂浆、抹灰砂浆,具有显著提高砂浆的强度,改善砂浆和易性、降低泌水率,提高抗冻性和抗渗性能等功能,能有效减少施工中的裂缝、起壳、空鼓等现象,提高砂浆的抗压强度和粘结强度、降低施工成本.适用于各类工业及民用建筑工程.     

聚合物砂浆在混凝土修补中的应用

聚合物砂浆是一种新兴的混凝土表面修补加固材料,具有粘结强度高、干缩变形小、抗压模量低,抗氯离子和硫酸盐离子侵蚀能力强的特点,而且可显著提高护筋阻锈能力,还具有一定的补偿收缩性能,同时价格比同类产品低.介绍了聚合物砂浆的主要性能、使用范围和聚合物砂浆施工质量控制方法,并提出施工过程中的注意事项.     

基于响应曲面法玄武岩纤维SMA-13沥青混合料配合比设计

SMA沥青混凝土已被广泛地应用到沥青路面结构.本文基于响应曲面法,以玄武岩纤维长度、掺量和油石比为影响因素,以空隙率、矿料间隙率、沥青饱和度、稳定度及流值为响应值,利用中心复合法进行正交组合试验设计,进行标准马歇尔试验.根据试验响应指标建立响应曲面模型进行分析,优化得出玄武岩纤维的最佳长度为6mm,玄武岩纤维的最佳掺量为0.49％,最佳油石比为5.65％.     

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.