万州晒网坝滑坡变形机理及稳定性规律跟踪研究

针对万州晒网坝滑坡地质勘查与长期监测滑移趋势不一致的现状,进行滑移机理跟踪,并通过物探验证跟踪结论。研究了135～175 m范围变化库水位及24 h强降水对该滑坡稳定性的影响,揭示了真实滑移面地质状况,纠正了地勘存在的不足,同时分析了滑移破坏机理。结果表明:该滑坡整体稳定、局部缓慢滑移;并提出了埋入式抗滑桩、裂隙封闭及地表排水的维护方案。     

长江上游塘土坝河段水流特性及河床演变分析

分析了塘土坝上游来水来沙条件,结果表明:该河段为典型山区河流,河岸组成较为坚硬,河床变形以推移质运动为主,河段年际间来水来沙变化不大。结合三峡大坝蓄水运行后该河段水沙条件的变化及实测地形资料,深入分析了塘土坝河段河床演变规律,并预测了洲滩演变趋势。为该河段航道维护和治理提供了理论依据。     

船舶管路先焊后弯工艺及应用

本文介绍了船舶管路在内场制作过程中如何实现先焊后弯的工艺方法,并采用理论计算和实际应用的研究方法验证了其可行性和实用性。     

跨海桥梁超高渐变段预制和安装控制技术

从短线预制基本思路出发,以厦漳跨海大桥北汊南引桥施工为例,介绍跨海桥梁超高渐变段采用短线匹配法进行梁段预制和安装的控制技术,为类似桥梁施工提供参考。     

大型散货港区干雾抑尘系统应用研究

为解决干散货港口中散货堆场、皮带机接口、翻车机房等部位的抑尘效果差这一现状,研制了干雾抑尘系统。介绍散货港区除尘技术现状,分析干雾抑尘技术的应用形式、适用条件。详细阐述微米级干雾抑尘技术原理和微米级干雾抑尘装置组成。该技术有众多特点和优势,起到良好的节能效果。     

浅谈大型船舶舱口围地面组装及整体吊装方案

本文介绍舱口围地面组装及整体吊装方案实施过程中,如何进行精度控制,减少整体吊装变形,实现舱口围组装与舱口盖安装调试工作转移到地面完成。     

考虑车辆到达时间窗的应急公交调度优化模型

针对城市轨道交通线路发生较长时间的运营中断事件,综合考虑应急公交车型和车辆到达时间窗两个角度,利用地面应急公交建立交通运输组织方案.通过车辆到达时间窗的限制有效剔除不合理的调度方案,然后以应急公交的救援时间、车辆运能、派车数量以及往返次数为约束条件,建立了带有车辆到达时间窗的应急公交调度优化模型,并利用改进的遗传算法对优化模型进行求解.最后通过南昌轨道交通二号线实例进行仿真分析.结果表明:改进的遗传算法的收敛精度和搜索能力均优于普通遗传算法,且优化模型可以有效提高应急公交的疏运效率.     

公交车辆节能减排驾驶技术研究

本文通过实测数据分析了南京市公交车运行工况,结合实验所得排放数据,运用碳平衡法计算燃油消耗量。基于工况与油耗数据,分析两者之间的关系,发现加速工况的油耗贡献率最大,因此需要改善公交车辆的加速工况。此外应当选择合理的速度匀速行驶以控制匀速工况下的油耗量。并进一步分析了速度、加速度对油耗量的影响,发现当速度大于25km／h,加速度在0．1m／s^2-0．4m／s^2范围内,减速度在0．1m／s^2-0．1m／s^2左右时油耗量较小。最后根据分析结果,提出绿色驾驶理念下,针对车速及加减速控制的公交车节能减排驾驶技术。     

Serial cost allocation in the cooperative purchasing organization

Under the seller＇s quantity discount, buyers self-organize or rely on a third party to aggregate their purchasing quantities to obtain lower prices. Because of the unequal member contributions in the cooperative purchasing organization, the buyers＇ strategy is different, the members often fluctuate, and the organizations do not sustain themselves. An effective mechanism is necessary to improve the performance of purchasing groups. We study the various forms of cost allocation mechanism in practice. Different allocation rules may have influence on the buyers＇ behavior （i.e., purchasing quantities, whether joining the organization or not）. We analyze the serial cost allocation and equilibrium purchasing quantity based on a Nash equilibrium, and the results show that each buyer is worse off when not participating in the existence buying organization of the other buyers. We further find that the serial mechanism just confirms the most efficient Nash equilibrium： reasonable cost allocation rule is necessary for the subjects to identify their optimal strategy.     

Automatic identification of cracks from borehole image under complicated geological conditions

Identifying cracks from the spread image of a borehole wall is one of the most common usages of borehole imaging method. The manual identification of cracks is time-consuming and can be easily influenced by objective judgment. In this study, firstly, the image translation from RGB color model to HSV color model is done to highlight the structural plane region, which is closer to the color recognition of human sight; secondly, the Saturation component is filtered for further processing and a twice segmentation method is proposed to improve the accuracy of automatic identification. The primary segmentation is based on the statistics of saturation over a longer borehole section and can give a rough estimation of a crack. Then, the pixels are shifted in the reverse direction to the sine curve estimated and make the centerline of the crack flat. Based on the shifted image, the secondary segmentation is done with a small rectangle region that takes the baseline of the roughly estimated crack as its centerline. The result of the secondary segmentation can give a correction to the first estimation. Through verifying this method with actual borehole image data, the result has shown that this method can identify cracks automatically under very complicated geological conditions.