BIM在建设工程项目中的创新价值初探

对BIM国际前沿文献进行跟踪研究,梳理BIM在建设工程项目中的主要应用模式。在分析建设工程创新特性的基础上,指出BIM为建设工程项目各参与组织构建了合作创新的工作环境。依据建设工程创新类别,分析BIM应用模式的创新定位,探索BIM在建设工程创新中的价值。     

环视中国式门窗——中国数学艺术之探索

在中国，存在许多艺术创造实例，它们具有极其强烈的数学背景．众所周知的中国窗格也是如此，具有高度的艺术价值与数学价值．这些有意义的窗格是本文主要讨论的内容，在许多中国窗格中，我们都能发现欧几里得原理和变换群的影子．     

基于解释结构模型的建设工程创新关键成功因素分析

通过文献综述及专家访谈,识别出20个建设工程创新的关键成功因素,运用解释结构模型,对识别出的关键成功因素进行结构层次分析,为建设工程创新管理提供清晰可靠的决策依据。建议管理者需着重管理建设工程创新关键成功因素的根源因素,以最少的投入获得最大的收益。     

Negative Valve Overlap Mode of HCCI Operation Using Gasoline and Diesel Blended Fuels

The negative valve overlap (NVO) strategy of HCCI operation was experimentally investigated on a gasoline HCCI engine operated with variable valve timing in association with the addition of diesel fuel. The experimental results show that, by using gasoline and diesel blended fuels, the required NVO interval for suitable HCCI combustion under a given engine speed and a moderate compression ratio condition could be reduced, and the HCCI combustion region was extended remarkably without substantial increase in NOx emissions under a given inlet and exhaust valve timing due to the improvement of charge ignitability. In addition, the possible scale of NVO was extended. A substantial increase in the lean limit of excess air ratio and the upper limit of load range can be achieved because of higher volumetric efficiency, resulting from the decrease in the required NVO and the presence of less residual gases in cylinder.     

Negative Valve Overlap Mode and Diesel of HCCI Operation Using Gasoline Blended Fuels

The negative valve overlap (NVO) strategy of HCCI operation was experimentally investigated on a gasoline HCCI engine operated with variable valve timing in association with the addition of diesel fuel. The experimental results show that, by using gasoline and diesel blended fuels, the required NVO interval for suitable HCCI combustion under a given engine speed and a moderate compression ratio condition could be reduced, and the HCCI combustion region was extended remarkably without substantial increase in NO, , emissions under a given inlet and exhaust valve timing due to the improvement of charge ignitability. In addition, the possible scale of NVO was extended. A substantial increase in the lean limit of excess air ratio and the upper limit of load range can be achieved because of higher volumetric efficiency, resulting from the decrease in the required NVO and the presence of less residual gases in cylinder.