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.     

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.     

潜艇低噪声安静操纵控制技术研究

为了提高潜艇的声隐身性能,除对潜艇主要噪声源进行减振降噪处理外,还需要在潜艇实际使用中应用相应的低噪声安静操艇技术.从潜艇使用出发,对潜艇噪声组成及特性进行了分析,研究了潜艇操艇控制系统的噪声特性,在此基础上对潜艇低噪声操艇技术进行了探讨.     

200km/h客货共线铁路隧道照明工程技术改进

针对列车提速后铁路隧道行车安全的可靠性问题,结合遂渝线200 km/h客货共线山区高速铁路隧道的气动力和扰动的特性,对隧道照明现状进行了分析,找出可能存在的问题,并着重对隧道照明的灯具及电缆挂架进行技术改进,检验表明改进后的隧道照明性能良好。     

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。     

德国傅雷宁AFU800型补缝机

介绍了德国博雷宁AFU800型补缝机的工作原理，工作过程以及结构特点，通过补缝实验证实该机结构合理，性能优越，适合机场路面的补缝工作。     

机场沥青道面补缝设备

简要分析了机场混凝土道面的裂缝及对沥青混凝土罩面层的影响，给出了沥青道面裂缝封闭的施工工艺和施工步骤，对国内外补缝装备如冷施工机具、热施工设备、专用补缝装备进行了介绍，重点介绍了德国博雷宁公司的补缝设备。     

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。     

电动汽车发展的工程哲学

从环境保护和能源危机两个方面探讨了电动汽车的发展目的,回顾了电动汽车的发展历史,提出了现代电动汽车的概念,分析研究了电动汽车发展的工程哲学.