Broken rails are the most common cause of severe freighttrain derailments on American railroads. Reducing the occurrence of broken-rail-caused derailments is an important safety objective for the railroad industry. The current practice is to periodically inspect rails using non-destructive technologies such as ultrasonic inspection. Determining the optimal rail defect inspection frequency is a ...

Abstract The numerical and computation aspects of the Knife-edge Equivalent Contact ( KEC ) constraint lookup table LUT methods are compared in this paper. method implementation uses a penetration-based elastic contact model for flange constraint-based formulation at wheel tread. For method, where an infinitely narrow rail contacts equivalent wheel, regularization tread-flange transition is ado...

Masked logic styles use a random mask bit to de-correlate the power consumption of the circuit from the state of the algorithm. The effect of the random mask bit is that the circuit switches between two complementary states with a different power profile. Earlier work has shown that the mask-bit value can be estimated from the power consumption profile, and that masked logic remains susceptible...

Running rails used as a return conductor and ungrounded scheme have been widely adopted in DC traction power systems. Due to the longitudinal resistance of running rails and insulation resistance of rail-to-ground, there will be a potential rise between running rails and the ground when return current flows through the running rails, which is known as rail potential. At present, abnormal rise o...

Link unidirectionality is a commonly encountered phenomena in Wireless Sensor Networks (WSNs), which is a natural result of various properties of wireless transceivers as well as the environment. Transmission power heterogeneity and random irregularities are important factors that create unidirectional links. Majority of the inter-node data transfer mechanisms are designed to work on bidirectio...

In soft-wood sawmills in the western U.S., the green lumber end-product is the result of several distinct sawing operations: an initial breakdown of large diameter logs by a headrig yields boards that are subsequently resawn one or more times by secondary saws of various types. Vibration of the saws contributes to irregularities in thickness of the final green lumber. Misalignment of the saws p...

In different operating conditions of the railway track, service life rails is different. This indicates that there are external factors have a significant impact on process rail wear. work, analysis influential was carried out and their degree influence determined in comparison with each other statistical population.
 To study this problem, most difficult section Slavsko-Lavochne-Beskid-Vo...

This report evaluates rail transit benefits based on a comprehensive analysis of urban transportation system performance in major U.S. cities. It discusses best practices for evaluating transit benefits. It finds that cities with larger, well-established rail systems have significantly higher per capita transit ridership, lower average per capita vehicle ownership and mileage, less traffic cong...