低墩客专整孔箱梁移动模架施工关键技术研究

以五里河特大桥移动模架为例,提出了一套适合低墩桥梁的移动模架施工技术,阐述了低墩移动模架施工     

船艺训练课程教学改革的探讨

船艺训练课程包括理论学习和实践操作两大部分,且尤为突出对实践能力的培养和要求,是甲板部船员在海员素质培养上一个必不可少的基础教学环节。本文通过船艺训练课程的教学改革实践,针对提高该课程理论和实践环节的教学质量,提出了行之有效的多媒体辅助教学手段与方法,对当前的航海教学改革有一定的参考意义。     

桥面铺装双层SMA混合料设计与施工控制

目前,双层SMA因其独特的优点,正越来越多地应用于桥面铺装中。该文结合苏通大桥北引桥相关工程实际,对双层SMA混合料的性能要求进行了分析,对混合料设计进行了优化,并进行了全面的性能试验研究;同时明确了施工控制方法。     

天然岩沥青对沥青混合料性能的影响

该文对国产岩沥青的路用价值展开研究,选择不同的基质沥青,分析岩沥青对沥青混合料的性能影响及岩沥青的最佳用量。试验结果表明,应用岩沥青可以显著提高沥青混合料的路用性能,岩沥青的最佳掺量为沥青质量的8％左右,同时岩沥青与基质沥青有一定的配伍性。     

隧道形式快速路出入口设计研究

考虑到高架快速路对城市景观、环境的影响,中心城区内的快速路往往采用隧道形式,目前对于这种形式的出人口设计研究较少,该文系统分析了城市隧道形式快速路出人口设计的主要内容。研究隧道形式的匝道出人口合理间距;提出匝道控制的基本策略与方法;在交通管理设施方面,对出人口处配套的标志牌、地面标线设计给出具体的研究实例,对城市隧道形式快速路的出人口系统设计有较好的借鉴意义。     

热管散热器的实验研究及温度场数值模拟

为了提高真空断路器额定载流密度,对端子处安装了毛细结构热管散热器的铜排通流2200A,进行了温度分布情况实验研究。通过PT1000热敏电阻探头测得的各部分温度分布情况,分析了在加装热管后的散热效果。对热管散热的换热过程进行理论分析,建立数学模型。结果表明,计算得到的温度分布情况与实验测得的数据吻合度较高,为提高散热性能提供了参考依据。     

Application of novel rotation angular model for 3D mouse system based on MEMS accelerometers

A new scheme is proposed to model 3D angular motion of a revolving regular object with miniature, low-cost micro electro mechanical systems (MEMS) accelerometers (instead of gyroscope), which is employed in 3D mouse system. To sense 3D angular motion, the static property of MEMS accelerometer, sensitive to gravity acceleration, is exploited. With the three outputs of configured accelerometers, the proposed model is implemented to get the rotary motion of the rigid object. In order to validate the effectiveness of the proposed model, an input device is developed with the configuration of the scheme. Experimental results show that a simulated 3D cube can accurately track the rotation of the input device. The result indicates the feasibility and effectiveness of the proposed model in the 3D mouse system.     

山区公路路线设计探讨

结合承德山区某公路设计,对山区公路路线设计中的线形选择、沿河溪线设计、线形标准选择、圆曲线设计、凹凸曲线设计、环境保护等进行分析与探讨,并对山区公路路线设计中容易忽视的问题提出建议。     

小型公路路面加速加载试验设备MMLS1/3

以路面加速加载试验设备为研究对象,对其主要种类和特点进行比较分析,重点对小型公路路面加速加载试验设备MMLS的技术参数、系统总成和测试内容进行了分析,结果表明小型设备MMLS具有体积小,移动方便,加载速度快,能够模拟路面不同干湿条件和温度条件,可以在较短的时间内建立路面结构使用性能指标的变化规律,从而得到对沥青路面结构长期使用性能的评价.     

Study of hierarchical federation architecture using multi-resolution modeling

This paper aims at finding a solution to the problem aroused in complex system simulation, where a specific functional federation is coupled with other simulation systems. In other words, the communication information within the system may be received by other federates that participated in this united simulation. For the purpose of ensuring simulation system unitary character, a hierarchical federation architecture (HFA) is taken. Also considering the real situation, where federates in a complicated simulation system can be made simpler to an extent, a multi-resolution modeling (MRM) method is imported to implement the design of hierarchical federation. By utilizing the multiple resolution entity ( MRE ) modeling approach, MRE for federates are designed out. When different level training simulation is required, the appropriate MRE at corresponding layers can be called. The design method realizes the reuse feature of the simulation system and reduces simulation complexity and improves the validity of system Simulation Cost (SC). Taking submarine voyage training simulator (SVTS) for instance, a HFA for submarine is constructed in‘this paper, which approves the feasibility of studied approach.