Transition zones in railway tracks are locations with considerable changes in the vertical stiffness of the rail support. Typically they are located near engineering structures, such as bridges, culverts, tunnels and level crossings. In such locations, the differential settlement always exists and continually grows without proper maintenance. Due to the effect of the differential settlement and...

• Evaluation of the behaviour a railway track supported by alternative sleepers. Use ballast box test to represent single sleeper section track. Digital Image Correlation technique for measuring sleepers’ deflection profile. Sleepers with low modulus will have W-shape Local deformation at rail seat can account up 10 % total deflection. Alternative technologies replacement timber are made materi...

The wheel-rail-sleepers system is simulated as a series of moving point loads on an Euler–Bernoulli beam resting on a visco-elastic half space. This paper concentrates on the railsleepers interaction system (railway system) and the fault detection. The main objective is to mathematically develop and implement a dynamic model of a railway system then the diagnosis of system defects using a Luenb...

Abstract This study aimed to determine the abrasion resistance of ultra-high-performance concretes (UHPCs) for railway sleepers. Test samples were made with different cementitious material combinations and varying steel fiber contents shapes, using conventional fine aggregate. A total 25 UHPCs two high-strength (HSCs) selected evaluate their depth wear bulk properties. The results coefficient v...

We validated a Fitbit sleep tracking device against typical research-use actigraphy across four nights on 38 young adults. Fitbit devices overestimated sleep and were less sensitive to differences compared to the Actiwatch, but nevertheless captured 88 (poor sleepers) to 98 percent (good sleepers) of Actiwatch estimated sleep time changes. Bland-Altman analysis shows that the average difference...

also in our study ‘good sleepers’ have Hb values significantly higher than the ‘poor sleepers’, even if they do not reach the values obtained by Iliescu et al.: this confirms that a clinical trend to a better sleep quality exists by raising Hb levels. In summary, although the data of statistical analysis must be clearly kept in mind, to raise Hb levels above our reported values remains a possib...