نتایج جستجو برای: sleeper defects
تعداد نتایج: 134695 فیلتر نتایج به سال:
There are several factors causing fastening systems to deteriorate faster than the designed life. The high repetitive loads from a moving train being one of the main factors, track irregularities, design and installation defects of track components, non-uniform rail support stiffness, unevenness in the rail seat deterioration are some of the factors causing fastenings systems to deteriorate fas...
The shear resistance at the sleeper–ballast interface of a ballasted track is an important contributor in maintaining stability under faster and heavier axle loads where ballast undergoes significant lateral sliding. Different types interfaces based on type sleeper arrangements, such as concrete sleepers, timber pads (USPs) attached to sleepers influence railway tracks. Therefore, this study de...
Timothy A. Sanborn, MD, FACC,* Lynn A. Sleeper, SCD,† Eric R. Bates, MD, FACC,‡ Alice K. Jacobs, MD, FACC,§ Jean Boland, MD,\ John K. French, MBCHB, PHD,¶ Jo Dens, MD,# Vladimir Dzavik, MD,** Sebastian T. Palmeri, MD, FACC,†† John G. Webb, MD, FACC,‡‡ Mark Goldberger, MD, FACC,§§ Judith S. Hochman, MD, FACC,\\ for the SHOCK Investigators New York, New York; Watertown, Massachusetts; Ann Arbor, ...
FOREWORD Phase I of the Motor Carrier Efficiency Study (MCES) identified a broad array of technology applications that have the potential to leverage advancements in wireless communications. With the commercial rollout of fourth-generation (commonly called 4G) wireless telecommunications systems, creative developers have greater opportunity to develop useful tools to exploit high-speed, data-ri...
H. G. Wells, one of the pioneering utopian and dystopian authors late Victorian Age, delineates a political conjuncture into which London rest world may evolve two centuries later. The novel depicts future in working class is socially oppressed new order where government that holds reign power globally capitalism has gained an ultimate victory historically. Moreover, this dystopic representatio...
Railway Sleepers are one of the most important elements in the track superstructure. Their tasks are keeping the track geometry, resisting against vertical and lateral train loads and transferring the train loads to the ballast layers. In this research, the railway sleeper as a beam on the elastic foundation is modeled with finite length. In this regard, two cases including a) beam with constan...
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