地铁工程中基坑施工工法选择分析

中国地铁建设的热潮方兴未艾，但由于地铁施工环境的复杂性、工期及造价的限制，使得地铁施工的工法选择非常重要．尤其是围护结构选择，现结合西安地铁车站设计和施工实际，对地铁施工中围护结构通常采用的几种工法：地下连续墙、灌注桩、土钉墙、SMW工法连续墙等的特点及其实用条件作了比较分析，进行了工法方案的选择，并得出了关于地铁围护施工工法比较的一些普遍结论，     

浅谈海事文化理念和实践

海事文化分为海事管理文化、海事行为文化及海事物态文化,并按此基本结构模式、建立创建对象、创建目标、创建方法.     

高速铁路道岔设备维修的探索与思考

介绍了中国高铁电务设备概况,在此基础上就当前高铁电务设备维护的关键点道岔维修提出了一套科学的方法,综合发挥集中监测设备作用,及时掌握道岔状态,建立道岔信息数据库,高效地完成不良道岔检修。     

Classification decision tree algorithm assisting in diagnosing solitary pulmonary nodule by SPECT/CT fusion imaging

Objective To develop a classification tree algorithm to improve diagnostic performances of 99mTc-MIBI SPECT/CT fusion imaging in differentiating solitary pulmonary nodules (SPNs). Methods Forty-four SPNs, including 30 malignant cases and 14 benign ones that were eventually pathologically identified, were included in this prospective study. All patients received 99Tcm-MIBI SPECT/CT scanning at an early stage and a delayed stage before operation. Thirty predictor variables, including 11 clinical variables, 4 variables of emission and 15 variables of transmission information from SPECT/CT scanning, were analyzed independently by the classification tree algorithm and radiological residents. Diagnostic rules were demonstrated in tree-topology, and diagnostic performances were compared with Area under Curve (AUC) of Receiver Operating Characteristic Curve (ROC). Results A classification decision tree with lowest relative cost of 0.340 was developed for 99Tcm-MIBI SPECT/CT scanning in which the value of Target/Normal region of 99Tcm-MIBI uptake in the delayed stage and in the early stage, age, cough and specula sign were five most important contributors. The sensitivity and specificity were 93.33% and 78. 57e, respectively, a little higher than those of the expert. The sensitivity and specificity by residents of Grade one were 76.67% and 28.57%, respectively, and AUC of CART and expert was 0.886±0.055 and 0.829±0.062, respectively, and the corresponding AUC of residents was 0.566±0.092. Comparisons of AUCs suggest that performance of CART was similar to that of expert (P=0.204), but greater than that of residents (P<0.001). Conclusion Our data mining technique using classification decision tree has a much higher accuracy than residents. It suggests that the application of this algorithm will significantly improve the diagnostic performance of residents.     

黄土地区灌注桩泥浆浸湿范围及周边土体深层竖向位移试验研究

根据西安地铁试验段钻孔灌注桩周边土体深层竖向位移监测试验资料及泥浆浸湿对比资料，对黄土地区灌注桩施工过程中土体不同深度位移及泥浆浸湿范围进行了研究，为钻孔灌注桩的工程应用提供有益的理论依据和参考．     

压浆固化松散路基技术：京广线顶进框构桥采用的施工方法

介绍了对松散砂层和砂夹卵石层路基进行压浆固化处理的技术和工艺，路基压浆固化后开挖时很稳定，解决了顶桥松散路基塌方后严重危及运输安全和施工安全的问题。     

浅谈大直径挖孔灌注桩在实际工程中的应用

大直径挖孔灌注桩受力明确，承载力大，施工简便，造价低，在各类持力层较好的建筑工程中广泛应用，本结合实际工程浅谈大直径挖孔灌注桩在实际工程中的应用。