悬臂灌注预应力混凝土连续梁(刚构)施工及设计

悬臂浇灌预应力混凝土连续梁(刚构)是近年来广泛应用于铁路、高速公路、市政工程的一种桥型,通过对该类桥梁的设计浅析特别是施工探索,试图给设计、施工和管理等方面提供较有价值的参考。     

磁力吸铁车的研制与应用

丹东港集团有限公司年吞吐量达4000多万吨，其中铁矿粉、废钢、生铁等磁性货物约占2／5。在废钢装卸作业过程中，一些钢钉、铁屑、钢渣等隐藏在货物中，作业机械、车辆通过时轮胎时常被其扎破，既影响作业效率，又增加了大量的购买轮胎的维修费用。在铁矿类货物作业过程中，总会有被风或运输车辆带起的粉尘飘落到堆场、路边或码头边角处，尘土飞扬，既不环保，又造成一定的货损。     

数字通信技术在无线调车灯显设备中的应用

简述数字无线通信技术在无线调车灯显设备中的应用情况。介绍无线灯显设备模转数过程中技术政策,以及现场试用所遇到的问题和解决方案,对数字通信技术的应用前景进行展望。     

群桩-土-承台结构共同作用的数值计算研究

群桩承载性状的数值计算,是在模型试验的基础上,为研究桩-土相互作用,采用一种既简单又符合土体成层、非均质实际情况的有限层计算模型。该文论述的计算模型不仅能满足工程实际的弹性计算要求,还研究了桩周土体的非线性特性。同时,还综合应用弹性理论法和荷载传递法的优点模拟桩的承载性状,利用有限元分析软件ANSYS建立其力学模型进行计算。数值计算结果与实测结果吻合良好,表明有限层方法计算超长群桩基础是可行的。     

大宇船厂进水闸防渗设计与施工

该文通过鸭绿江(丹东地区)大宇船厂进水闸工程防渗设计与施工的描述,论述了防渗设计中材料和施工方法选择的几点看法。     

基于模糊综合评判的汽车动力系统匹配方案优选

利用模糊综合评判方法确定了汽车动力系统匹配目标,依据匹配目标和零部件资源,并考虑相关传动系统参数的重新设计开发确定了8种匹配方案。利用CAE车辆性能仿真软件对8种方案进行模拟计算,采用多因子加权分值评价法优选匹配方案试制出样车,并进行了道路试验。结果表明,优选方案的整车综合性能良好,燃料经济性突出,可满足市场需求。     

锦屏水电枢纽辅助洞(B洞)高压水处理施工技术

锦屏水电枢纽工程是一项大型的水电工程,它的建设将为国家特别是西部的电力行业做出巨大贡献,该水电枢纽辅助洞工程是水电站前期工程的控制性关键项目。文章介绍了施工中遇到的高压涌突水问题,以及根据不同的地质和涌突水情况确定的不同处理措施,可为今后解决类似的工程问题提供借鉴和参考。     

Experimental study on the effect of cyclic preloading on the resistance to liquefaction of saturated loose sand under wave loading

By using the soil static and dynamic universal triaxial and torsional shear apparatus, a series of combined cyclic shear tests are performed to simulate the rotation in the principal stress direction induced by ocean wave. The tests include the cyclic preloading tests and liquefaction tests in the second loading on saturated loose sand with a relative density of 30%. The all tests are consolidated under isotropic condition. The effect of the cyclic preloading on the resistance to liquefaction of saturated loose sands under the condition of continuous rotation in the principal stress direction is investigated. Experimental data indicate that the void ratio of saturated sands has a negligible reduction after cyclic preloading. With the increase of the intensity of cyclic preloading (in the amplitude and in the number of cycles), the resistance to liquefaction in the second loading is increased continuously under the condition that the liquefaction does not occur during the cyclic preloading. The reason is that the construction of more stable structure due to the uniformity of the void and the better interlocking of the particles when the cyclic preloading is applied to the saturated sand.     

基于客流变化的行车组织分析

本文主要通过分析在地铁运营的过程中,客流产生明显变化时,行车人员运用的抽线、加开以及在信号系统中加入的设备干预等措施进行相应的行车调整分析,并针对这种情况提出了数据分析、客流曲线生成软件的开发以及时刻表编制分析等方面的相关问题和建议。     

Voyage-based statistical fuel consumption models of ocean-going container ships in Korea

ABSTRACT

Accurately estimating fuel consumption of ships is crucial for shipping companies, port authorities, and environmental protection agencies. The bottom-up approach is becoming increasingly popular because it can estimate ship fuel consumption by accounting for ship activity conditions, such as changes in voyage speed, time, and distance; however, its use is still limited when estimating ship fuel consumption. Ship-specific information, such as the daily fuel consumption rate for main and auxiliary engines for every vessel, is expensive to gather, and generally not collected from private shipping companies. To address this research gap, we develop simplified and composite ship fuel consumption models for ocean-going container ships by size using a regression model. To estimate the fuel consumption models for container ships, we rely on ship activity data, including average speed and sailing time, distance, and actual fuel consumption for main and auxiliary engines. This information is obtained from a major container shipping company in Korea. We estimate and validate the parameters associated with fuel consumption for five different container ship sizes, all of which are smaller than the Post-Panamax container ship (15,000 TEU and above).