Sources of gains from international portfolio diversification

This paper looks at the determinants of country and industry specific factors in international portfolio returns using a sample of forty eight countries and thirty nine industries over the last three decades. Country factors have remained relatively stable over the sample period while industry factors have significantly increased during the last decade and dropped again since 2000. The importance of industry and country factors is correlated with measures of economic and financial international integration and development. We find that financial market globalization is the main driving force behind the changes in relative magnitude of the different shocks. Country factors are smaller for countries integrated in world financial markets and have declined as the degree of financial integration and the number of countries pursuing financial liberalization has increased. Higher international financial integration within an industry increases the importance of industry factors in explaining returns. Economic integration of production also helps in explaining returns. Countries with a more specialized production activity have higher country shocks.     

Technological diversity,related diversification,and firm performance

Previous findings that related diversification creates value have been called into question over concerns about methodology and measures. Reviewing existing theory to consider how a firm's knowledge base interacts with its product market activity, I address several of these concerns by creating a measure of technological diversity based on citation‐weighted patents. The measure indicates a firm's opportunity for corporate diversification based on economies of scope in valuable knowledge assets, is defined for both single‐ and multibusiness firms, and is not correlated with more fundamental aspects of diversification, such as the number of businesses in the corporate portfolio. Evidence from a large sample of firms shows the positive relationship between diversification based on technological diversity and market‐based measures of performance, controlling for R&D intensity and capital intensity as further indicators of the type of assets underlying diversification. Results hold when controlling for the endogeneity of diversification and performance in a cross‐sectional sample or when controlling for unobserved factors using panel data. Copyright © 2006 John Wiley & Sons, Ltd.     

强化质量管理促进螺杆泵采油技术规模应用

从螺杆泵采油技术在油田应用中的实际出发．阐述了该项技术在从试验向规模化推广应用过程中，以强化全面质量管理为基点．重视螺杆泵采油技术应用中各个环节的质量控制，从组织机构的建立、管理制度的制定、人员素质的提高、配套技术的完善等方面。强化管理和质量控制，使这项试验技术成功转型为常规技术，并得以规模化应用。阐明了全面质量管理在螺杆泵采油技术应用中发挥的重要作用。     

Developing Technological Stance: Children's Learning in Technology Education

Following a review of current research in children's learning in technology education, and an examination of the kinds of knowledge demanded in contemporary technology education programs in elementary schools, I argue that what is needed in early technology education programs is the scaffolding of what I am calling technological stance. This construct acknowledges the socio-cultural character of technology as a human endeavor. In contrast to programs which are oriented to application of conceptual and procedural knowledge or to programs in which knowledge is generated through interpretation of interactions with materials and tools, programs which support technological stance position learners as critical inquirers into both tool-related and discursive practices of technology.     

Enhancing Practicing Primary School Teachers' Pedagogical Content Knowledge in Technology

This paper describes the frameworks and cognitive tools that have been developed to enhance practising teachers' pedagogical content knowledge in primary school technology education. The frameworks evolved from our research that firstly examined existing teaching practices, secondly enhanced formative interactions and thirdly enhanced summative assessment strategies. The evidence gained over the three years demonstrated how the effective use of frameworks could be utilised to enhance teacher pedagogical content knowledge (PCK). How we see learning is of prime importance in examining the development of teacher pedagogical content knowledge. A sociocultural view of learning is taken where human mental processes are situated within their historical, cultural and institutional setting. In the research project we strongly emphasised the need for teachers to build a knowledge base for teaching technology. Critical aspects identified as enhancing PCK included: negotiated intervention, planning frameworks, reflection on case studies, workshops and support in classrooms, appropriate resources, teacher agreement meetings, portfolios of student work and summative profiles. The increased PCK resulted in: enhanced teacher knowledge about technology including the nature of technology, areas of technology and specific technological knowledge, changed pedagogical approaches, enhanced teacher student interaction, refinement of appropriate learning outcomes, critical decision making, improved teacher confidence, and enhanced student learning. Seven characteristics or features of pedagogical content knowledge that we believe are important for effective teaching and learning in technology are presented. This revised version was published online in July 2006 with corrections to the Cover Date.     

现代制造系统环境下的质量信息技术

企业为了确保在激烈的市场竞争中取胜，必须运用信息技术、计算机技术等先进技术提高企业质量管理的水平，增强质量保证和质量控制的有效性。现代制造技术系统CIMS的质量保证系统是在网络数据库的支持下，从产品设计、开发，到售后服务全生命周期中对质量有关的数据进行有效的采集、处理、评价和决策，对质量管理、质量保证、质量控制活动进行有效的管理，实现企业质量管理的整体优化．以达到全面满足顾客要求，提高市场竞争能力的目的。     

推广施工新技术提高工程科技含量

在建筑工程施工新技术推广与应用现状宏观分析的基础上，以“2004年建设部科技示范工程项目”大连开发区文化中心施工新技术应用与推广为实例，分析了如何结合工程实际采用新技术来提高工程科技含量、保证工程质量，并提出了一些措施和对策。     

以技术标准为核心,整合施工企业标准体系

企业标准体系如何与企业一体化管理体系整合？结合施工企业推进标准化管理的实际，要把握好“两个接口”和“一个整合”的问题。一是解决好与国家和行业的技术标准、技术法规、技术规范的“标准接口”。二是解决好企业标准体系——系列标准体系“各子体系接口”的问题。三是把企业标准体系同企业一体化管理体系整合起来。     

油田企业应用质量可靠性技术初探

结合油田企业特点，阐述了开展质量可靠性技术的必要性，并从提高人的意识、加强质量可靠性信息管理、加强软件可靠性管理、加强统计技术应用、加强质量可靠性技术在油田勘探开发生产工艺中的应用等几方面提出建议。     

强磁防垢技术研究及其在油田的现场应用

对国内某油田注水管线的结垢现象及水质和垢物成分进行了分析，探讨了强磁防垢机理，研究了磁处理的特点。通过室内晶相显微观察法。优化选择强磁处理的最佳磁参数，根据最佳磁参数设计出适合此油田现场使用的强磁防垢器，并在油田现场安装磁化器实施强磁防垢技术．观察磁防垢前后注水管线状况和结垢对比。现场实践表明，强磁防垢技术不但操作方便，而且可取得显著的效果和经济效益。