Seabed scene simulation and its realization in extending Vega

Realistic simulation of underwater scene is always difficult because of the special and complex vision effects in underwater space. Seabed is an important part of underwater environment. This paper describes the methods for seabed scene simulation based on OpenGL. It includes construction of fluetuant terrain based on the random sinusoidal algorithm, simulation of seabed flicker effect by means of circular texture mapping and generation of turbidity effect by using fog techniques. For the application based on the leading high level 3D development environment-Vega, underwater scene simulation is still a difficulty since there is no module for it. Based on the analysis of Vega software and the research on seabed scene simulation methods, a Vega extending module named “Underwater Space” was created through developing module class and extending lynx interface. The module class was designed through developing DLL written in C . The Lynx was extended through developing keyword configure file, GUI configure file and lynx plug-in DLL. The problem that Vega can‘t simulate underwater space, is elementarily resolved. The results show that this module is efficient, easy using, and the seabed scene images am vivid.     

内蒙古西北地区路基干压实技术的应用

为研究内蒙古西北地区干压实技术的现场施工控制指标,采用干压实技术对2段试验路的路基进行碾压。现场试验结果表明:施工机具在施工过程中存在能量损失,通过2种典型机具现场试验,得到施工机具能量损失率为20%;对碾压遍数与松铺厚度、施工机具型号的关系进行修正,推荐最佳碾压遍数;基于现场压实度检测和回弹模量检测数值,提出回弹模量与压实度的关系,进而提出以回弹模量为路基施工控制指标,并给出相似地区不同压实度下的回弹模量推荐值。     

The development of safe riding guidelines for young riders – A case study of Phu Yen,Vietnam

Phu Yen is a small province located in the central part of Vietnam and is suffering from a tremendous number of traffic casualties, compared with other cities in Vietnam and developed countries. Young riders take a large proportion, accounting for 47.6% in total traffic crashes. To resolve this issue, the present study aims to (i) analyze young riders' behavior and their attitudes towards traffic safety and to (ii) propose a procedure to develop a book of safe riding guidelines to reduce their involvement in dangerous situations. A set of 73 questions in the questionnaire survey have been conducted to determine the risk-taking behavior and attitude towards traffic safety of 300 individuals, who are using bicycles, e-bikes, mopeds, scooters, and motorcycles less than 150 cc. The statistical results indicate that there are significant differences among riding behavior and attitudes of respondents towards traffic safety regarding the regional factor (rural, suburb, and urban), the demographic factor (gender and age), and the travel distance factor. The guidelines designed based on the questionnaire survey are used to alter adolescents' riding behavior and attitudes and so help them recognize, avoid, and handle risks in demanding traffic situations. An analysis of the before and after the traffic safety training workshop to evaluate the effectiveness of the proposed guidelines indicated that there was a significant increment in the perceived risks of young riders after training them by using this book.     

新型分布式振动阻尼器的理论和实验研究

研究了分布式振动阻尼器，在理论分析的基础上，对其宽带阻尼放大作用进行了理论计算和多 方案的实验验证，理论计算和模型试验的结果进一步说明了分布式振动阻尼器相对于传统的集中式阻 尼器而言，能大大增加振动能量的耗散，具有进一步减振的优点。     

沈阳地铁创新技术特点

介绍沈阳地铁1、2号线已建工程中的技术特点和9、10号线在建工程的技术延伸,已建工程的技术特点包括解决寒冷地区建设和运营难题,暗挖法修建车站解决环境干扰问题,新管幕法施工工法以及逆向引孔工艺应用等。在建工程的技术延伸包括新构筑法、轨道采用液体阻尼钢弹簧浮置板整体道床和再生能量吸收装置。     

港口与城市环境及资源的协调发展度研究

随着我国港口和城市建设的不断发展,在生态环境和资源利用方面港城间的矛盾日益明显,如何协调两者之间的发展已成为目前迫切需要解决的课题。为此,以大连市为例,从建立港城协调发展度模型入手,对港口与环境及资源之间协调的程度进行评判,从而为指导港口和城市的可持续发展提供了决策依据。     

基于CAN通信的电动汽车上位机系统开发

开发一种基于CAN通信的电动汽车上位机系统,能够对整车所有CAN节点的数据进行采集显示,并且能够与多个关键零部件进行数据交互,跨零部件进行数据分析.可用于样车的快速调试及售后疑难故障处理.     

沥青洒布车洒布均匀性探讨

本文对沥青洒布车横向洒布不均匀现象的成因与影响因素进行了深入分析。通过运用现行喷洒重叠理论，并结合工程实例分析了沥青洒布的不均匀、横向波纹、洒布重叠数等洒布效果与数据。文章总结了提高洒布均匀性的途径．还提出了“冲击一匀化”的新概念，对沥青洒布车的设计和使用具有指导意义。     

Dynamic Performance of a Bulkhead Flat Car

The dynamic performance of a flat car is studied herein. The performance indices include roll angles, lateral accelerations, center plate loads, side bearing loads, wheel loads and spring deflections. These variables are maximum when the car is running at its critical speed, corresponding to either the rock and roll, or the bounce mode. The Association of American Railroads' (AAR) Flexible Carbody Model was used. The input for vertical track irregularities used in the simulation was generated from published spectra for U.S. Federal Railroad Administration (FRA) Class 4 track. After studying the car's performance with various column loads and spring suspensions, it was found that the most commonly used column load of 4,000 lbs. (17.8 kN) should be used. The spring suspension used in the original car design should also be adopted, in order to avoid spring bottoming.     

16V280A型缸套制造工艺研究

通过分析影响16V280A型缸套制造质量的因素，设计了合理的机械加工工艺，并选用合适的设备、设计专用工装及刀具，满足了切削加工要求。