查询词典 clapper rail

However, according to the constructing and operating actuality, most urban rail transits are still allowanced by the government with a low profit except Hong Kong.As quasi city public goods, the urban rail transit has great external benefit.

但是，从各城市轨道交通的建设经营现状看，大多数轨道交通处于政府补贴状态，赢利水平低，目前只有香港等少数几家运营盈利。

Wheel/rail noise of the high-speed slab track on concrete bridge and that of the urban elevated supporting block track are predicted respectively. Noise of the slab track, compared with that of the ballasted track, is more severe. The noise of the slab track is about 6.2dBA higher than that of the ballasted track for the receiver nearby the rail, and about 3.5dBA higher than that of ballast track for the receiver

对降低高速铁路桥上板式无碴轨道及城市轨道交通桥上支承块式无碴轨道轮轨噪声的技术措施进行了研究，包括：(1)分别就板式轨道和支承块式轨道结构参数的低噪声设计原则进行了研究；(2)对几种典型的新型轨道用吸声材料的降噪效果进行了分析，结果表明降噪效果显著；(3)就声屏障高度、位置、形状以及声屏障内侧敷设吸声材料对降噪效果的影响进行了分析，结果表明：声屏障越高、越接近轨道，降噪效果越好；声屏障内侧敷设吸声材料，可降低钢轨近旁噪声2.0～3.0dBA，可降低近地面噪声约1.5～2.0dBA

This paper analyzes the cause of small concaves around the welding seam in the long rail of Guangzhou Metro Line 2, and presents preventive measures, such as increasing the under layer of the rail, limiting the weld seam, lowering the welding temperature etc.

摘要结合广州地铁2号线接触焊焊接长钢轨的实践，分析了产生焊头表面小凹痕的原因，提出改变垫高钢轨的方式、缩小正火範围、降低正火温度、限制接头错牙量等预防措施。

Carmody said the track is a continuous welded rail, and ''heat can be a factor and cause a slight misshaping or buckling in the rail.

Carmody说，铁轨是一段段焊接起来的，因此&天热可能是一个导致铁轨轻微变形或弯曲的因素&。

One of the most popular rigid rail fixation items, are extensively used to tighten the rail track on to the wooden or concrete tie.

极受畅销的一些铁路配件中的一种，广泛的用于把铁轨固定在木枕木或混凝土枕木上。

The invention provides an insulation pad which is provided with high strength and high friction between a rail cap and a clamp, wherein the pad uses stainless steel as base, two faces of the pad are baked with enamel which is sanded and roughens the surface to brush a layer of silicon rubber, the outline is the same as the inside surface of the rail joint, the aperture on the pad and aperture distance are the same as the aperture and aperture distance of the clamp.

本发明就是制造一个钢轨端头与夹板间的高强度、高摩擦力的绝缘垫板，该垫板的由不锈钢板为基底，双面烤上搪瓷，搪瓷面先经喷砂处理，使其表面粗糙后，刷上一层的硅橡胶，轮廓与钢轨接头内侧表面相同，该垫板上的孔径与孔距与钢轨与夹板的孔径与孔距相同。

In light of the resistance absorption used in the current urban rail transit which has disadvantages including the waste of energy and the accessional cooling equipment, this paper gives a capacitive absorption program, which makes full use of braking energy and reduces pollution, this is a technology that worths studying and promoting in the field of urban rail transportation.

曾建军，林知明，张建德摘要：针对目前国内城市轨道交通采用电阻吸收方式存在的浪费能量及需加装散热设备的缺点，提出了采用电容吸收的方案，该方案充分利用了制动能量，减小了环境污染。

Relationship between forces born by bridge and rail under the action of temperature variation, deflection and braking are analysed by using bridge ballast rail as an unified model , and simply supported bridges, 30 m and 40 m in span length, are calculated with a programme of finite element of two dimensional frame structure.

利用桥梁—道碴—轨道的统一模型，对桥梁温度伸缩、桥梁挠曲作用以及制动力作用下的桥轨受力关系进行了分析，并利用平面杆系有限元程序对30m及40m简支梁桥进行了计

In the development process of big cities,the balance of urban rail transit network running income has not been resolved in the past hundreds of years of the rail transit development in developed countries,in addition,it is a practical problems in the fac...

大城市发展进程中轨道交通网络运营收益平衡不仅是发达国家百年来轨道交通发展史上尚未根本解决的问题，更是我国城市化快速推进中大城市轨道交通投融资建设面临的现实难题。

Research conclusions:The analysis and comments are made on the requirements and the technical indexes of rail, sub - rail foundation, fittings and ballast bed for track structure of passenger dedicated railway line and high - speed railway in many countries, and the thinking is offered for development of the key track technologies

研究结论：对各国在高速铁路轨道结构、客运专线和高速铁路对轨道结构的要求、钢轨、轨下基础、扣件、道床等方面的技术指标做出分析和评述，并对一些关键技术的发展提出了思路。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。