新一代调度集中（CTC）对无线移动通信的需求分析及实现方案探讨

本文简要介绍了新一代调度集中的主要特点，重点分析其对无线移动通信的要求，并分析了目前常见解决方案各自的利弊，就存在的问题提出了观点。     

自然通风隧道火灾的烟气特性和控制标准

建立自然通风隧道火灾三维数值计算模型,并应用缩尺隧道试验数据对数值模拟进行验证,采用验证过的数值计算方法对自然通风地铁区间隧道的火灾烟气特性和安全控制标准进行三维数值模拟研究。结果表明,数值模拟结果与试验结果吻合较好;孔口尺寸对隧道顶壁烟气温度、人员高度处的CO浓度和能见度的影响较大,但对人员高度处的温度几乎没有影响;在隧道火灾4种安全控制标准中,人员高度处的能见度起主要控制作用。     

新型玻璃太阳能电池在钻井平台中的应用

本论文对海上钻井平台的发电系统做了一些探讨,提出了由玻璃太阳能电池发电和钻井平台主发电系统并网给照明灯供电的设想,并对其硬件部分和具体的接入方式做些说明,进一步将绿色可再生能源引进到现实的生产生活中来,提高生产率的同时做到节能减排。     

乾元公司铁路专用线场站模式探讨

目前,传统的铁路专用线建设模式是铁路专用线自接轨站接轨,通过区间正线引入厂区的建设模式,这种模式的区间正线受地形条件、厂区位置和沿线规划影响较大,这些影响将不可避免地导致铁路专用线建设工程投资的增加,如能根据运输性质考虑缩短区间正线长度,在接轨站旁边设装车作业站,将大大减少专用线工程投资.以乾元公司铁路专用线建设模式为例来研究铁路专用线场站模式,就如何在接轨站旁边设装车作业站,实现接轨站设备与铁路专用线共用进行探讨.     

轨道交通牵引回流方式对轨道电路的影响分析

对上海轨道交通直流电力牵引中常用的“无回流阻抗棒”和“回流阻抗棒”回流方式进行比较分析,并结合现场实例、实测数据,分析了不同类型的牵引回流方式对轨道交通轨道电路的影响。设置回流阻抗棒的轨道电路工作比较稳定,“跳红光带”的现象较少。     

如何在公路施工中做到扬尘抑制

当前我国环境保护现状十分严峻,作为大气污染的三大源头之一的扬尘是产生空气污染的主要原因。本文以公路施工行业为切入点,全面分析了作为施工行业对于环境保护应尽的社会责任和义务,进一步在扬尘产生的源头、防治方案、实施措施、监督监管等方面进行了系统的阐述和说明,以呼吁行业内的其他同行提高环境治理意识,采取切实可行的措施。     

能源消耗实时监测控制系统研究

能源实时监测控制系统的应用,促使船舶能耗监测形式由人工监测向在线监测转变、能耗监管时效由能耗统计向能耗实时监测转变,提高能源消耗监测控制的准确性和实时性,有效提高能耗的现代化管理水平。     

16PA6STCV280柴油机配气机构虚拟样机技术研究

为研究16PA6STCV280柴油机配气机构系统动态特性,采用Pro/E软件建立了柴油机配气机构的三维实体模型,通过ADAMS软件与Pro/E软件的接口M echan ism/Pro模块,将三维实体模型导入到ADAMS软件中,建立了16PA6STCV280柴油机配气机构虚拟样机,在此基础上对该机配气机构进行了运动仿真分析,得到了进、排气阀等关键部件的位移、速度、加速度以及受力等运动学和力学参数,为进一步有限元结构分析以及系统优化提供了基础.     

Property Evolution of Sulphoaluminate Grouting Material under Pressure Circulation北大核心CSCD

Water-sealed underground oil tank projects are quite different from traditional underground projects since the water-sealing conditions are very strict and the difficulties caused by the geological specificity, structural specificity and construction specificity are key factors affecting the project. In light of the significant early initial setting time and rapid temperature increase of sulphoaluminate cement-based grouting material for a large domestic water-sealed underground oil tank with pressurized cyclic grouting, a laboratory grouting simulation is conducted. It is found that the properties of the sulphoaluminate cement-based grouting material are quite different under different pressure cycles, the hydration exothermic peak time gets shorter with an increase of circulation time, the compressive strength decreases with an increase of circulation time, and the longer the circulation time the more obvious the de-crease of compressive strength. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

Experimental Study on Mechanical Behaviors of Prefabricated Column-Base Joint with Grouted Sleeves Connecting Longitudinal Reinforcements in Tunnels北大核心CSCD

In recent years, large shield tunnels with internal double-decked lanes have been developing rapidly in the field of highway tunnels, and prefabricated elements are increasingly adopted in internal structure. Based on the columns-base joint in Zhuguanglu tunnel, which is under construction, 2 full-scale specimens are designed for the quasi-static test, one specimen is connected with grout sleeve splicing and the other is cast in place. The test results show that: the bearing capacity of specimen with grout sleeve splicing is equal to that of cast-in-situ specimen, but its ductility and energy dissipation capacity are worse than that of the cast-in-situ specimen. And for the specimen with grout sleeve splicing, there exists crack concentration on the area above the sleeve. The crack width is too larger in this area. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.