27000 DWT多用途船设计

多用途船以其分舱灵活、装载货物种类多、货物装卸方便等优势,得到国内外以散杂货运输为主的船东青睐.介绍27 000 DWT多用途船的主要参数和总体布置情况,并对其EEDI能效设计指数、主机配置优化、线型优化设计、货舱布置、舷侧设计和防海盗措施进行了探讨.     

基于ARM 7的S3C44B0X与多路模拟器控制板通讯接口设计与实现

本文介绍了ARM处理器S3C44B0X的基本特性及其UART单元,设计了利用S3C44B0X与多个模拟器控制板的多路通讯接口,以解决主控制器与多路控制板的实时协同工作问题,给出了通过广播控制电文进行控制的实例,该设计成功应用于某大型训练模拟器,结果表明了其具有良好的扩展性和使用推广价值。     

实用性磁流变弹性体性能研究

为了制备出实用型磁流变弹性体,本文提出了一种新型磁流变制备方法,利用设计的有场固化模具,制备出了聚氨酯基磁流变弹性体,并对其力学性能进行了系统的研究.     

直接浮力法测定铅酸蓄电池隔离材料的孔率

本文介绍铅酸蓄电池隔离材料孔率测定的新方法和简易装置,并对铅酸蓄电池隔离材料试样进行了孔率测定和讨论.     

RAP离析对再生沥青混合料性能的影响分析

通过室内模拟试验,分析了沥青回收料(RAP)离析状态和程度对再生料体积参数、力学性能和路用性能的影响。结果表明:RAP离析对再生料性能影响比较显著,且RAP偏粗离析对再生料性能的影响大于偏细离析的影响。在RAP偏粗离析时,造成再生料空隙率过大,对水稳定性极为不利,且大幅度降低再生料的低温性能、疲劳性能和强度,且在同一程度的离析情况下,对再生料性能的影响大于原生料。在RAP偏细离析时,虽然对再生料的水稳定性和抗疲劳性能无不利影响,但将使再生料的抗车辙性能和低温抗裂性能显著降低。     

Evaluating the service requirements of dedicated container terminals: a revised IPA model with fuzzy AHP

The purpose of this article is to evaluate the service requirements of dedicated container terminals (DCTs). In this article, the service attributes (SAs) of DCTs were first discussed. A fuzzy analytic hierarchy process model was then constructed to measure the users’ perceived importance and dissatisfaction for each of the SAs. Based on these two measurements, a revised importance-performance analysis model was proposed to identify the SAs that should be improved. To validate the model, the dedicated container terminal of Evergreen Marine Corp. (EMC DCT) at Kaohsiung Port and its users were empirically investigated. With respect to the empirical results, managerial implications of the findings in improving service quality for the EMC DCT are discussed.     

船体构件开孔及补强探讨

构件开孔是船舶设计和建造过程中重要环节之一,其目的是保证船舶安全性能和使用性能,改善施工环境和缩短建造周期,对船舶建造过程中结构开孔问题进行分析,归纳出合理的开孔大小、位置和结构弥补方式。     

全垫升气垫船操纵运动研究

本文用大振幅平面运动机构对全垫升气垫船模型进行了约束试验，测得了作用在船上的水动力，在此基础上用计算机解气垫船操纵运动微分方程，预报气垫船的回转性能，并与实船试验的结果进行了比较，两者吻合较好。     

高铁CRTSⅡ型轨道板生产线预应力损失测试

CRTSⅡ型无砟轨道板的质量是高铁安全运行的重要保证,对施工中预应力张拉的有效控制是保证轨道板施工质量的关键。结合CRTSII型无砟轨道板生产线具体结构形式及预应力损失机理,设计了预应力损失现场测试方案和预应力损失计算方法。实测结果表明CRTSⅡ型无砟轨道板生产线预应力损失不能忽略,应引起重视。     

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.