隧道改路基工程方案分析及管理对策

以托苗坳隧道改路基工程为例,根据其地质条件提出了隧道改路基施工方案,简要分析该施工方案并提出工程施工中的管理对策.     

Ground delay program planning under uncertainty in airport capacity

Abstract

This paper presents an algorithm for assigning flight departure delays under probabilistic airport capacity. The algorithm dynamically adapts to weather forecasts by revising, if necessary, departure delays. The proposed algorithm leverages state-of-the-art optimization techniques that have appeared in recent literature. As a case study, the algorithm is applied to assigning departure delays to flights scheduled to arrive at San Francisco International Airport in the presence of uncertainty in the fog clearance time. The cumulative distribution function of fog clearance time was estimated from historical data. Using daily weather forecasts to update the probabilities of fog clearance times resulted in improvement of the algorithm's performance. Experimental results also indicate that if the proposed algorithm is applied to assign ground delays to flights inbound at San Francisco International airport, overall delays could be reduced up to 25% compared to current level.     

Effective aircraft maintenance schedule adjustment following incidents

In the real world, planned aircraft maintenance schedules are often affected by incidents. Airlines may thus need to adjust their aircraft maintenance schedules following the incidents that occur during routine operations. In tradition, such aircraft maintenance schedule adjustment has been performed manually, a process which is neither effective nor efficient, especially when the problem scale is large. In this study, an aircraft maintenance schedule adjustment model is developed, with the objective of minimizing the total system cost, subject to the related operating constraints. The model is formulated as a zero-one integer program and is solved using a mathematical programing solver. The effectiveness of the model is evaluated by application to a case study using data from an aircraft maintenance center in Taiwan. The test results show the proposed model, as well as the scheduling rules abstracted from the results are useful for the decision maker to adjust good maintenance schedules.     

基于《公路桥梁技术状况评定标准》的桥梁评定管理系统开发

《公路桥梁技术状况评定标准》（JTG/TH21-2011）作为公路工程行业推荐性标准对桥梁评定工作的系统化规定及其评定细则和量化标准较04规范,评分计算工作更加复杂,评定周期大大延长。因此,利用C#语言开发桥梁评定管理系统,实现新规范评定工作的软件化,并更细化了规范的评分方法,极大地简化评分计算工作,缩短了评定周期;在评定结果基础上开发的管理系统,帮助用户更加便捷地管理日常检测数据,观察构件、部件的老化情况,为公路桥梁养护决策提供有力支持。     

某型柴油机振动异常故障排除

文章针对某型柴油机异常振动的问题,在故障分析的基础上,制定了异常振动排查方案,在对曲轴轴瓦和摆式减振器修复后,有效地解决了异常振动故障。     

后山坪隧道塌方原因及处理方案分析

岩质破碎区隧道在施工过程中易发生塌方事故,对深埋、长大、地处岩质破碎区隧道的塌方处理是施工技术难点.基于水平岩层破碎地质段隧道塌方的工程处理实例,介绍了一种处理隧道衬砌端头塌方的工程技术.     

提升工科高校学生工程实践能力策略研究——基于“卓越计划”背景下工学类专业人才培养的分析

反思我国工科高校工学人才培养状况,存在的主要问题,一是工学类毕业生培养的基本工作能力呈现下降趋势;二是工学类专业学生实习和实践环节亟待加强;三是部分工学类专业急需更新课程教学内容;四是部分工学类专业急需改进教学方法。高校人才培养结构调整到满足中国产业升级的需要,除了从人才供应量上补充,还需要从"质"上进行根本改革。为此,从三个方面提出了工科高校学生工程实践能力培养的范畴,从四个方面提出了工科高校学生工程实践能力培养的基本思路。     

适应珠三角地区物流产业转型升级的高职报关与国际货运专业改革

珠三角地区物流产业转型升级需要大量高职报关与国际货运专业人才,并明确提出了职业能力提升要求,高职院校为适应人才需求和职业能力的更高要求必须进行专业改革,提高人才培养质量。文中分析了珠三角地区物流产业转型升级主要方向和职业能力提升要求,以广东交通职业技术学院报关与国际货运专业为例,提出了一系列专业改革措施,介绍了改革方案实施状况;改革成效表明,专业改革有效增强了学生的职业能力和岗位适应性,初步为珠三角地区物流产业转型升级提供了人才支撑。     

一种实用的配电网潮流算法

目前matlab潮流计算程序多是基于输电网开发,而对配电网中潮流计算程序较少开发。配电网由于其特有的辐射性、R／X较大、节点较多的特性,导致用于输电网的潮流计算方法由于收敛性问题并不适用于配电网系统中。针对辐射性配电网的特点,开发了用于配电网潮流计算的matlab程序,该程序采用新的支路选择方法,无需对网络进行复杂的编号,并通过算例验证了程序的正确性。     

关于波形梁护栏在特殊路段加固的分析

基于山区三、四级公路路肩宽度不足及路面宽度受限的情况下,对路侧护栏的加固完善进行方案比选,并对可行的波形梁路侧植筋并模筑基础砼的加固方案进行结构受力分析,兼顾了路面宽度和护栏结构设置要求,结果证明是安全、便利、经济的。