120型控制阀局减阀的改进建议

针对现场检修集中反映出的情况，提出了改进建议。     

关于建设环渤海京津冀地区城际铁路网的探讨

通过介绍城际铁路的特点及发达国家城际铁路网发展的经验 ,结合环渤海京津冀地区区域经济发展特征 ,提出了以北京 ,天津为中心、石家庄 ,保定 ,唐山 ,秦皇岛为重点城市 ,京津为主轴、北京至石家庄、北京至秦皇岛为两个辅轴 ,建立京津冀城际铁路网的建议 ,并逐步建立主轴与辅轴之间的联接。     

浅谈投标决策和报价应重点掌握的几个问题

编好施工组织设计方案和搞好实地调查,是编好投标报价的基础.只有在此基础上,才能正确抉择合理的投标报价.     

动力分散型电动车组车载微机网络的功能划分与接口设想

从车载微机网络的拓扑结构、网络组成单元及功能划分、接口与控制逻辑、故障处理几个方面提出了动力分散型电动车组车载微机网络的功能划分与接口设想。     

输入设备在Vega应用中的接入方法研究

Vega软件环境默认的输人设备为鼠标，以其控制实体或视点的运动不够形象直观，需要将特定的输人设备应用到视景仿真系统中。在分析了Vega结构和工作原理的基础上，通过设计自定义的运动模式以及创建管理输人设备的Vega类实例，将特定的输人设备接人到基于Vega的视景仿真应用中。结果表明，该方法操作简单灵活，感觉直观，有效地改善了仿真实验效果。     

武汉轨道交通1号线一期工程车站及高架线设计

介绍了武汉市轨道交通1号线一期工程高架车站的建筑、结构设计。对现行《地铁设计规范》和城市轨道交通系统中采用高架线的问题表述了意见。     

SYNTHESIS OF THERMAL RESPONSE FACTORS AND Z-TRANSFER FUNCTION COEFFICIENTS FOR CALCULATION OF ROOM TEMPERATURE VARIATION

1IntroductionTheresearchesonthecalculatingapproachtodynamicair-conditioningloadshaveledtoatechnicalrevolutioninthefieldofair-condition-ing.Themethodssuchasthethermalresponsefactormethod(TRFM)andthez-transferfunc-tioncoefficientmethod(ZTFM)areknownbymoreandmoreresearchersandtechnicians.Thedynamicmethodscanbetterreflectthecharac-teristicsofpracticalobjectsthanthesteadymethods,andsomeachievementshavebeenmadeinthedynamiccalculationfield,buttherearestillmanyproblemsthatmustbesolved.Uptonow,ther…     

关于我国机车信号主体化问题

从地面信号设备和车载信号设备整个系统全面考虑，分析了机车信号主体化涉及的问题及影响机车信号稳定性和可靠性的因素；并从机车信号设备、生产、施工、使用、维护全过程，提出了提高机车信号稳定性和可靠性的途径和方法，以实现机车信号主体的目标。／     

铁路框架地道桥受下穿隧道施工影响的研究

采用荷载结构模型及连续介质力学模型分别对铁路顶桥受下穿地铁区间隧道施工影响所产生的沉降及内力变化进行计算分析 ,并据此提出下穿框架式地道桥的地铁区间的设计及施工的有关技术要求。     

A study on improving the course-keeping ability of a pure car carrier in windy conditions

The course-keeping ability of a pure car carrier (PCC) in windy conditions is discussed in this article. Numerical simulations of two PCCs were carried out to compare their course-keeping abilities in wind. The two PCCs had the same hull form but different types of rudder. One PCC was fitted with a semispade rudder (hereinafter, the normal rudder), whereas the other was fitted with a spade-type Schilling rudder (hereinafter, the Schilling rudder). Both PCCs were designed to a new concept for the accommodation structure and hull form above the load water line. In this new design concept, there are no sharp corners in the superstructure so as to reduce wind resistance and improve steering performance. The limits of course keeping for the two PCCs were investigated through simulations. The course-keeping abilities of the two PCCs, each with two different types of autopilot system, were also investigated in wind. To develop the numerical simulation, the hydrodynamic coefficients of the two PCCs were predicted based on the data published for a third PCC having similar principal particulars. The numerical model of the two PCCs was validated by comparing its behavior with the respective full-scale trial results. Wind resistance coefficients were predicted by combining the results of wind tunnel experiments of the object PCCs and a regression model. Numerical simulations under steady wind conditions were also carried out and the results compared with some full-scale experiments to validate the mathematical model of the PCC.