我国合成树脂工业进展及面临的挑战

本文回顾了过去十年来我国合成树脂工业的发展,预测了到本世纪末以及2010年的前景,讨论了目前存在的问题及面临的挑战,提出了重要的问题是提高市场竞争力。     

近红外光谱分析在农业领域应用中的几个问题

分析近红外在农业领域应用的特殊性,分析近红外分析过程中影响模型性能的若干因素,讨论近红外分析准确度的评价方法,预测标准差SEP不宜作为近红外分析性能的指标性参数,提出近红外分析在农业应用中值得重视的研究方向。     

缸内直接喷射汽油机的新技术

本文从燃油喷射系统、燃烧系统、混合气形成的基础理论研究、燃烧和排放等几方面介绍了汽油缸内直接喷射技术取得的新进展以及目前尚未解决的技术难题，指出排放问题将是决定缸内直喷汽油机发展的关键因素。     

有机高分子絮凝剂的研究现状

有机高分子絮凝剂由于具有用量少、生成的污染量小,且带有多种带电基团等优点而得到广泛应用.本文综述了国内外近几年来有机高分子絮凝剂在水处理等方面的应用情况,探讨了该絮凝剂在发展中存在的问题,并展望了未来絮凝剂的研究方向和发展趋势.     

柴油临氢降凝技术研究进展

介绍了柴油异构降凝反应机理和国内外的临氢降凝新技术研究进展,以及临氢降凝技术的发展趋势。     

建设工程施工管理有关问题析议

本文结合笔者多年工程项目管理实践,从工程进度、质量、成本等方面详细阐述了在工程施工过程中运用现代管理思想,建立科学有效的管理体系,提升项目管理水平和经济效应的方法。重点阐述了管理工作中一些容易被项目管理者忽视的控制性问题。     

Evaluation of image-based modeling and laser scanning accuracy for emerging automated performance monitoring techniques

Accurate and rapid assessment of the as-built status on any construction site provides the opportunity to understand the current performance of a project easily and quickly. Rapid project assessment further identifies discrepancies between the as-built and as-planned progress, and facilitates decision making on the necessary remedial actions. Currently, manual visual observations and surveying are the most dominant data capturing techniques but they are time-consuming, error-prone, and infrequent, making quick and reliable decision-making difficult. Therefore, research on new approaches that allow automatic recognition of as-built performance and visualization of construction progress is essential. This paper presents and compares two methods for obtaining point cloud models for detection and visualization of as-built status for construction projects: (1) A new method of automated image-based reconstruction and modeling of the as-built project status using unordered daily construction photo collections through analysis of Structure from Motion (SfM); (2) 3D laser scanning and analysis of the as-built dense point cloud models. These approaches provide robust means for recognition of progress, productivity, and quality on a construction site. In this paper, an overview of the newly developed automated image-based reconstruction approach and exclusive features which distinct it from other image-based or conventional photogrammetric techniques is presented. Subsequently the terrestrial laser scanning approach carried out for reconstruction and comparison of as-built scenes is presented. Finally the accuracy and usability of both of these techniques for metric reconstruction, automated production of point cloud models, 3D CAD shape modeling, and as-built visualizations is evaluated and compared on eight different case studies. It is shown that for precise defect detection or alignment tasks, image-based point cloud models may not be as accurate and dense as laser scanners' point cloud models. Nonetheless image-based point cloud models provide an opportunity to extract as-built semantic information (i.e., progress, productivity, quality and safety) through the content of the images, are easy to use, and do not need add burden on the project management teams by requiring expertise for data collection or analysis. Finally image-based reconstruction automatically provides photo alignment with point cloud models and enables image-based renderings which can remarkably impact automated performance monitoring and as-built visualizations.     

Dense,denser, densest ...

These words net out the driving forces, the evolutionary thrusts and the assorted limitations of the microelectronics technology—the semiconductor chips and their packaging. Current status of the technology is near the middle of the S-shaped learning curve, with the attendant highest rate of progress. This paper highlights the driving forces (e.g. cost, performance), the limiting parameters (e.g. dimensions, tolerances, power densities) and the major parametric interdependencies. Major historical trends and their extrapolations quantify key variables.     

水轮机调速器发展综述

本文介绍了我国水轮机调速器近十年来所取得的进展。详细列举了Ａ种电液调速器（其中七种为微机型调速器）的技术特点，并提出了作者对今后我国水轮机调速器发展的几点意见。     

质量检验综述(下)

文章从质量检验的概念步骤以及计划与实施流程等进行了全方位综述。