试论套管钻孔咬合桩在基坑围护中的应用

该文通过上海新延安东排水泵站深基坑围护工程实例,论述套管钻孔咬合桩质量控制要点、硬软切割法选择、实例经验;以及该工艺在特殊地质情况和作业面条件下的应用成效和前景。     

A water-fat separation imaging method for the brain on low field magnetic resonance imaging

Water-fat separation is a particularly important problem for magnetic resonance imaging. Although many methods have been proposed, the reliability is still challenging. In this work, we have presented a method based on the combination of the branch-cut method and multigrid algorithm to get a more robust performance of water-fat separation. First, the branch-cut method is applied to identify residues, which violates the requirement that the interacting phase gradient around a closed path be zero. Residues and branches are marked to be zeros and filled to the weighting factor array. Then, the unwrapped phase array can be given by the multigrid algorithm. Finally, the Dixon method for water-fat separation is applied to the unwrapped phase array. Experiments for brain scanning on the 0.3T low field MRI system demonstrate the successful application of the proposed method.     

喇嘛溪沟冲刷切割模型稳定性FLAC数值分析

通过理论分析和FLAC数值模拟对重力侵蚀下冲刷切沟作用的喇嘛溪沟边坡进行研究,包括塑性区、剪应力、剪应变及位移矢量变化等几方面。结果表明,这类边坡在长期重力、水力侵蚀作用下,将会影响其稳定性。可供通过该区域的雅安—石棉—泸沽高速公路设计施工参考。     

汶川地震堰塞湖地形地貌因素判读分析

2008年5月12日四川省汶川县映秀镇发生了里氏8.0级地震,诱发造成了众多堰塞湖。文中利用ArcGis绘制灾区地形水系图,结合堰塞湖分布状况,分析得出了与堰塞湖形成有关的地形、水系因素。     

金华市婺江大桥上部结构控制爆破拆除

利用工程实例，介绍了复杂环境下双曲拱桥的保护性部分控制爆破拆除。     

CM—350型数控气体火焰切割机及其应用

介绍了ＣＭ－３５０型数控气体火焰切割机的原理、构成及规格参数。该切割机由数控系统控制割炬对板材进行切割。其基本结构为龙门式、基本功能是可切割出形状复杂的板件，并具有自动化程度高、效率高、质量高、安全、易操作、好保养、大大改善劳动条件等优点。应用该切割机对机车、客车板材进行切割，可极大地提高下料能力与质量。